EP3026349B1 - Cooking device component and method for producing same - Google Patents

Cooking device component and method for producing same Download PDF

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Publication number
EP3026349B1
EP3026349B1 EP15190695.5A EP15190695A EP3026349B1 EP 3026349 B1 EP3026349 B1 EP 3026349B1 EP 15190695 A EP15190695 A EP 15190695A EP 3026349 B1 EP3026349 B1 EP 3026349B1
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EP
European Patent Office
Prior art keywords
metal substrate
enamel
layer
cooking appliance
component
Prior art date
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Application number
EP15190695.5A
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German (de)
French (fr)
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EP3026349A1 (en
Inventor
Karl Wiengarten
Jörg Neumann
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Miele und Cie KG
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Miele und Cie KG
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Priority claimed from DE102015110756.2A external-priority patent/DE102015110756A1/en
Application filed by Miele und Cie KG filed Critical Miele und Cie KG
Publication of EP3026349A1 publication Critical patent/EP3026349A1/en
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Publication of EP3026349B1 publication Critical patent/EP3026349B1/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C14/00—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning
    • F24C14/02—Stoves or ranges having self-cleaning provisions, e.g. continuous catalytic cleaning or electrostatic cleaning pyrolytic type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/005—Coatings for ovens
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F24C15/08—Foundations or supports plates; Legs or pillars; Casings; Wheels

Definitions

  • the present invention relates to a cooking device component and a method for producing such a cooking device component, the cooking device component in particular having a cooking space suitable for performing pyrolysis and having a component wall that at least partially delimits the cooking device component.
  • the component wall comprises a metal substrate with an enamel coating provided on it.
  • the wall of the cooking chamber is made of black sheet metal, on which an enamel coating is applied for the purpose of corrosion protection.
  • Metallic cooking chamber walls coated with enamel do not change their visible surface properties even after repeated pyrolysis at temperatures of over 400 ° C.
  • the enamel coating reliably protects the surface from color change due to tarnishing or corrosion.
  • the DE102012109147 describes a household appliance in which a component has an enamel layer and a conductive coating arranged thereon.
  • the EP1384953 discloses a cooking appliance component according to the preamble of claim 1, which consists of ferritic or austinitic stainless steel and is coated with enamel.
  • the DE19921467 discloses a cooking appliance component which uses a steel with material number 1.4828.
  • a cooking device component according to the invention has, in particular, a cooking space suitable for performing pyrolysis, the cooking device component comprising at least one component wall that at least partially delimits the cooking device component.
  • the component wall comprises a metal substrate with an enamel coating applied at least partially thereon.
  • the cooking chamber wall has at least one surface section that is kept free from the enamel coating and is therefore electrically conductive for making electrical contact with the metal substrate, and the metal substrate consists at least partially of a heat-resistant, austenitic or ferritic steel.
  • the cooking appliance component according to the invention has many advantages.
  • a significant advantage of the cooking device component according to the invention is that the cooking device component is designed to be suitable for pyrolysis and at the same time has an electrically conductive surface section for making electrical contact with the metal substrate. This means that more technical and also decorative design options are available.
  • a cooking appliance component according to the invention can be designed as a baking muffle. It is also possible and preferred to design the cooking device component as a cooking device on which at least one baking muffle capable of pyrolysis is provided.
  • the cooking appliance component is basically capable of microwave or high-frequency operation. In such applications, high-frequency rays such as microwaves or the like are introduced into the interior of the cooking space in order to at least partially heat the food present in the interior of the cooking space by means of radiant energy. In such applications, electrical contacting of the cooking chamber wall is usually necessary in order to achieve reliable shielding. The escape of high-frequency radiation from the interior of the cooking space should be reliably avoided. For this purpose, it is advisable to protect the cooking space all around from the escape of high-frequency radiation.
  • the cooking device component can, however, also be designed as a container or other functional part of a cooking device, for example as a steam generator.
  • an austenitic or ferritic heat-resistant steel is very advantageous, in which an electrically conductive Surface section for making electrical contact with the metal substrate also remains permanently free of oxide layers and the like.
  • austenitic or ferritic heat-resistant steels are used which do not corrode even at the temperatures of up to 860 ° C or possibly 880 ° C or more that occur during the enamel coating, so that little or no post-processing of the surface of the substrate is required.
  • an enamel-free surface section on the cooking chamber wall can be produced directly when the enamel layer is applied by covering or taping the desired surface section, for example, before applying the enamel layer, in order to provide a metallically bright surface section there.
  • a small effect on the electrical conductivity is understood to mean a maximum of four times the electrical resistance and in particular a maximum of twice or 1.5 times the electrical contact resistance on the electrically conductive surface section.
  • the metal substrate consists at least partially of a steel that is heat-resistant in accordance with the DIN EN 10095 standard.
  • the metal substrate particularly preferably consists entirely of such a steel.
  • the metal substrate is understood here in particular to mean the muffle wall or the steel wall of the cooking chamber.
  • the steel is a stainless steel. It is possible to use ferritic heat-resistant steels with the designation of material number and material short name 1.4742, 1.4762 and possibly 1.4724 and 1.4713. Austenitic heat-resistant steels with the abbreviations 1.4878 and 1.4828 and 1.4821 as well as 1.4876 and 1.4872 and 1.4835 are possible and particularly preferred.
  • the use of an austenitic heat-resistant steel from group 1.4841 has proven to be advantageous. Steels from group 1.4841 are heat-resistant up to 1120 ° C in air and contain components of carbon, chromium, nickel, silicon and possibly aluminum.
  • the metal substrate particularly preferably has an at least partially and in particular completely roughened surface.
  • Such a configuration is particularly advantageous since stainless steels, as mentioned above, and also other stainless steels have reduced adhesion between the steel and an enamel layer. It is possible to apply an additional bonding layer to the substrate before an enamel layer is applied, but this usually prevents or at least considerably worsens the electrical contacting of the metal substrate. This means that after the enamel layer has been applied, a complex post-processing step must then take place in order to enable electrical contact to be made with the metal substrate and to provide it in sufficient quality for the desired applications.
  • the surface of the metal substrate is particularly preferably at least partially roughened by brushing. It is also possible to at least partially roughen the surface of the metal substrate by grinding or, for example, sandblasting. It is also possible to use 2 or 3 different methods for producing the roughened surface. Brushing has proven to be particularly advantageous, since it can reliably and reproducibly provide a roughened surface of the metal substrate with little tension. If a sandblasting process is used, this can lead to a local compression of the surface, which can then lead to undesirable curved or bent surfaces on the cooking chamber wall if the parameters of the sandblasting process are chosen unfavorably.
  • the surface of the metal substrate is particularly preferably roughened on both sides. This is preferred for various reasons, also because stresses may occur in the metal substrate due to the possible stresses caused by the “bimetal effect”.
  • a mean roughness value Ra between approximately 1 ⁇ m and 4 ⁇ m is preferred. Average roughness values between 2 ⁇ m and 3 ⁇ m are particularly advantageous.
  • the mean roughness value is understood here to mean the arithmetic mean roughness value.
  • the surface of the metal substrate particularly preferably has a roughness depth Rz between approximately 10 ⁇ m and 40 ⁇ m.
  • a roughness depth Rz between approximately 15 ⁇ m and 25 ⁇ m is advantageous.
  • Under the roughness depth is understood here as the mean roughness depth and not directly the depth of individual grooves or points or furrows on the surface of the metal substrate.
  • the metal substrate particularly preferably has at least one sand-blasted weld seam.
  • the metal substrate is preferably bent over to form a baking muffle or the like and the two ends are welded to one another at the abutting edge in order to provide a completely closed baking muffle or the like. It is also possible and preferred to brush the weld seam in order to achieve the desired surface accuracy there. However, (local) sandblasting can be more cost-effective and / or easier in the area of the weld seam.
  • the metal substrate has at least one enamel-free surface section.
  • the metal substrate is coated with two enamel layers applied one on top of the other, which in particular are fired separately. But it is also possible to apply 2 layers of enamel one after the other and burn them together in one firing process.
  • first enamel layer to the metal substrate and the subsequent firing of the first enamel layer makes it possible, for example, to choose the ingredients and the mixing ratios in the first enamel slip layer differently than in the second enamel slip layer, which is applied to the already completely fired first enamel layer. In this way, it is possible to react accordingly to the different substrates for the first enamel layer and the second enamel layer.
  • first enamel layer the bare and roughened metal substrate is the surface, while the second enamel layer is applied to an existing enamel layer, so that the adhesion conditions for the respective enamel layers differ fundamentally.
  • the method according to the invention is used to produce a cooking device component, in particular with a cooking space suitable for performing pyrolysis, a component wall which at least partially forms the cooking device component is made from a metal substrate to which an enamel coating is at least partially applied.
  • a component wall which at least partially forms the cooking device component is made from a metal substrate to which an enamel coating is at least partially applied.
  • an austenitic or ferritic heat-resistant steel is at least partially used for the metal substrate and the enamel coating is applied in such a way that at least one electrically conductive surface section remains on the component wall for making electrical contact with the metal substrate.
  • the method according to the invention also has many advantages, since it allows an inexpensive and simple production of a cooking device component according to the invention.
  • an electrically conductive surface section for making electrical contact with the metal substrate of the component wall is also produced directly during production. Elaborate post-processing is not necessary in order to make electrical contact with the component wall.
  • the metal substrate is preferably roughened at least in sections and in particular essentially completely and particularly preferably completely before the enamel coating is applied. This allows improved adhesion of the enamel coating to the metal substrate, so that permanent and reliable adhesion of the enamel coating to the metal substrate is also ensured. In the case of multiple pyrolysis processes and the resulting thermal stresses due to the heating and expansion of the metal substrate, insufficient adhesion could lead to undesired loosening of the enamel layer and thus to destruction of the cooking appliance component. Therefore, reliable adhesion is very important in the case of the high thermal loads that occur during operation.
  • At least two enamel layers are particularly preferably applied, namely first a base enamel layer and then a top enamel layer. It is possible that a base enamel layer is applied first, which is then fired after the layer has been applied. After the metal substrate has been fired and cooled accordingly, the top enamel layer is applied and fired in a separate firing process.
  • a particle size distribution is preferably used for the base enamel slip that shows a grind fineness of 4-6 when tested with the Bayer sieve 16,900 M per centimeter square.
  • the fine grain fraction of the base enamel slip up to a size of 5 ⁇ m should be 15-30% and in particular between 20 and 2.5%.
  • the fine grain fraction up to a size of the enamel particles of up to 50 ⁇ m or 60 ⁇ m in diameter should be at least 90%.
  • An enamel slip layer with coarser enamel particles can be used for the top enamel layer.
  • a separate enamel slip layer is first applied for each enamel layer, which is then in particular fired separately. Firing temperatures of 780 ° C. to 835 ° C. are preferred for the base enamel layer. Temperatures of between 800 ° C. and 830 ° C. are particularly preferably used. During the firing process for the top enamel layer, firing temperatures of 840 ° C to 850 ° C can be used.
  • the enamel slip layer of the base enamel layer is thinner than the enamel slip layer of the top enamel layer. It is also preferred that the base enamel layer has a smaller thickness than the top enamel layer.
  • the application preferably takes place in such a way that a ratio of a layer thickness of the top enamel layer to the layer thickness of the base enamel layer is between 0.75 and 2 and in particular between 1 and 1.5.
  • FIG. 1 shows a highly schematic front view of a cooking device component 1, which is designed here as a whole as a cooking device 100 and includes a baking muffle 10. It is also possible that the cooking device component 1 comprises only the baking muffle 10 or only one component wall 3 or a container or a further functional part of a cooking device or is designed as such. In the exemplary embodiment shown, the component wall 3 is formed by a cooking chamber wall, which is therefore given the same reference number 3 below.
  • the cooking appliance 100 has a cooking space 2 made available by the baking muffle 10, which is bounded laterally and towards the rear by a cooking space wall 3.
  • a door is provided at the front.
  • the cooking chamber wall 3 consists of a metal substrate 4 to which an enamel coating 5 is applied to the surfaces 7 and 8 on the outside and the inside of the cooking chamber 2.
  • the cooking space wall 3 is made from an originally flat metal substrate 4, which is reshaped to form the cooking space.
  • a weld seam 9 is provided on the abutting edges at the ends in order to provide an all-round sealed cooking space 2.
  • the weld seam 9 is shown here in a corner of the cooking space 2, but can in principle be provided at any point in the cooking space 2.
  • Figure 2 shows a greatly enlarged cross section of a portion of the cooking space wall 3.
  • the metal substrate 4 is shown schematically in the cross section.
  • both the outer surface 7 and the inner surface 8 of the metal substrate 4 are covered with an enamel layer which has a thickness 12. It is also possible that the surface 7 forms the inner surface of the cooking appliance component 1 and that the surface 8 is arranged on the outside of the cooking space 2.
  • the enamel-free surface section 13 is shown at the surface section 6 where no enamel layer 5 is provided on the metal substrate 4.
  • the metallic surface of the metal substrate 4 is directly accessible.
  • the cooking substrate 4 has a rough surface, which was produced here by brushing the originally essentially smooth surface of the metal substrate. It is also possible to roughen the surfaces 7 and / or 8 of the metal substrate 4 by grinding or needling or optionally sandblasting, in order to provide a reasonable and sufficient surface roughness of at least one surface 7, 8 of the metal substrate.
  • Both surfaces 7 and 8 are preferably roughened in basically the same way and - apart from at least one surface section 6 - are essentially completely covered with the enamel layer 5. This enables an electrically conductive connection of the cooking chamber wall 3 in order to reliably prevent high-frequency radiation such as microwave radiation or the like from escaping from the cooking chamber 2.
  • the metal substrate 4 consists of an austenitic or ferritic heat-resistant steel. It is possible that the cooking chamber wall is formed from several substrate parts, but then at least one metal substrate consists of such a heat-resistant austenitic or ferritic steel. In this case, this metal substrate is made of an austenitic or ferritic heat-resistant steel on the metal substrate on which an electrically conductive surface section is provided and formed.
  • a steel of the material class 1.4841 is particularly preferably used, which is used both at the high temperatures the enamel layer as well as at the later operating temperatures at pyrolysis level is reliably protected from corrosion. This enables a permanently reliable electrically conductive connection to the cooking chamber wall 3.
  • the originally smooth metal substrate is preferably roughened on both sides in order to reliably avoid tensions due to different surface treatments on both sides.
  • the surfaces 7 and 18 are particularly preferably roughened in such a way that an arithmetic mean roughness value Ra of between 2 ⁇ m and 3 ⁇ m is present.
  • At least one surface 7, 8 of the metal substrate 4 particularly preferably has a surface roughness Rz between approximately 15 ⁇ m and 25 ⁇ m and particularly preferably approximately 20 ⁇ m.
  • the mean roughness preferably corresponds to the arithmetic mean of the deviation of the distance between the surface points from the center line.
  • the mean roughness would result in the height of the rectangle that has the same length as the route to be examined and the same area as the area between the reference height and the profile.
  • the averaged roughness depth is determined in a corresponding manner using known methods.
  • the depth 11 of individual grooves or points therefore regularly does not correspond to the mean roughness or the mean roughness depth, but a statistical evaluation takes place.
  • the original smooth metal substrate 4 made of the austenitic or ferritic heat-resistant steel is first of all roughened, preferably on both sides of the surfaces 7, 8, by brushing or the like, to produce the cooking device component 1.
  • a first enamel slip layer 16 is applied, which is only shown schematically in FIG Figure 2 is indicated by dashed lines.
  • the density of the enamel slip layer 16 is set between preferably 1.62 and 1.68 g per cubic centimeter.
  • a fine grain distribution is used in the enamel slip layer, which shows a grinding fineness of 4-6 when tested with a Bayer sieve 16,900 M per square centimeter.
  • the fine grain fraction up to 5 ⁇ m is between 20 and 25% and the total fraction of enamel particles up to a diameter of 50 ⁇ m is at least 90%.
  • customary grinding, adjusting and slip auxiliaries are adapted and the enamel slip layer 16 is applied to the surface 7 of the metal substrate 4 here.
  • the surface section 6 is preferably covered or masked beforehand so that this surface section 6 is not provided with an enamel coating.
  • the enamel slip layer 16 is then dried therein at temperatures between 20 and 80 ° C. until the residual moisture of the enamel bisque after drying is less than 4% and in particular less than 2%.
  • the cover for the surface section 6 can then be removed and the first or inner enamel layer 15 is burned in, which in the finished state preferably has a layer thickness between 60 and 120 ⁇ m and preferably between 80 and 100 ⁇ m.
  • the enamel layer is preferably burned in at temperatures which are a maximum of 830 °.
  • the stoving is preferably carried out at a reduced speed and with appropriate heating and cooling in order to achieve the desired adhesion conditions.
  • the second in Figure 2 The second or outer enamel slip layer 26, also indicated schematically by dashed lines, can be applied to the now finished enamel layer 15, the surface section 6 being cut out again.
  • the enamel slip layer 26 can be applied with conventional densities between about 1.7 and 1.82 g per cubic centimeter, the grain distribution of the base enamel having a fineness of grinding of, for example, 20-25, measured with a Bayer sieve 16,900 m per square centimeter.
  • the baking and drying of the second enamel layer 25 can essentially take place in a conventional manner, since the adhesion to the first enamel layer 15 meets the usual requirements.
  • the invention provides an advantageous cooking device component 1 in which an austenitic or ferritic heat-resistant steel is used for the metal substrate 4 and the metal substrate is essentially coated with at least one enamel coating on the inside and an enamel coating on the outside. At least one surface section remains free and contact can be made in an electrically conductive manner without any special reworking.
  • the surface of the metal substrate 4 is roughened in a defined manner, an 80 grain having proven to be advantageous. Roughening with a grain that is too coarse or too fine, however, did not lead to the desired results.
  • the application of a separate adhesion promoter based on nickel, for example, is not necessary with the present invention.
  • the surface of the austenitic or ferritic heat-resistant steel is roughened directly and a first layer of enamel and then a second layer of enamel is applied directly to it.
  • the invention makes it possible to provide pyrolysis devices which have bright metallic surfaces in order to make electrical contact with the cooking chamber wall or to achieve corresponding optical properties.

Description

Die vorliegende Erfindung betrifft eine Gargerätkomponente und ein Verfahren zur Herstellung einer solchen Gargerätkomponente, wobei die Gargerätkomponente insbesondere einen zur Durchführung von Pyrolyse geeigneten Garraum aufweist und eine die Gargerätkomponente wenigstens teilweise begrenzende Komponentenwandung besitzt. Dabei umfasst die Komponentenwandung ein Metallsubstrat mit einer darauf vorgesehenen Emailbeschichtung.The present invention relates to a cooking device component and a method for producing such a cooking device component, the cooking device component in particular having a cooking space suitable for performing pyrolysis and having a component wall that at least partially delimits the cooking device component. The component wall comprises a metal substrate with an enamel coating provided on it.

Im Stand der Technik sind verschiedenste Gargeräte bekannt geworden, die einen pyrolysetauglichen Garraum aufweisen. Meist besteht die Garraumwandung aus Schwarzblech, auf das eine Emailbeschichtung zum Zweck des Korrosionsschutzes aufgebracht ist. Mit Email beschichtete metallische Garraumwandungen verändern auch bei wiederholter Pyrolyse bei Temperaturen von über 400 °C ihre sichtbaren Oberflächeneigenschaften nicht. Durch die Emailbeschichtung wird die Oberfläche zuverlässig vor einer Farbänderung durch Anlaufen oder vor Korrosion geschützt.In the prior art, a wide variety of cooking appliances have become known which have a cooking space suitable for pyrolysis. Most of the time, the wall of the cooking chamber is made of black sheet metal, on which an enamel coating is applied for the purpose of corrosion protection. Metallic cooking chamber walls coated with enamel do not change their visible surface properties even after repeated pyrolysis at temperatures of over 400 ° C. The enamel coating reliably protects the surface from color change due to tarnishing or corrosion.

Die DE102012109147 beschreibt ein Haushaltgerät, bei dem ein Bauteil eine Emailschicht und eine darauf angeordnete leitfähige Beschichtung aufweist. Die EP1384953 offenbart eine Gargerätkomponente nach dem Oberbegriff des Anspruchs 1, welche aus ferritischem oder austinitischem Edelstahl besteht und mit Email geschichtet ist. Die DE19921467 offenbart eine Gargerätkomponente, welche einen Stahl mit Werkstoffnummer 1.4828 nutzt.The DE102012109147 describes a household appliance in which a component has an enamel layer and a conductive coating arranged thereon. The EP1384953 discloses a cooking appliance component according to the preamble of claim 1, which consists of ferritic or austinitic stainless steel and is coated with enamel. The DE19921467 discloses a cooking appliance component which uses a steel with material number 1.4828.

Schwieriger wird es, wenn aus dekorativen Gründen oder aus technischen Gründen metallisch blanke Oberflächenbereiche gewünscht werden. Bei Einsatz von Schwarzblech würde dies durch den innerhalb des Garraumes und auch außerhalb des Garraumes vorhandenen Wasserdampf schnell korrodieren und somit seine technischen und Oberflächeneigenschaften ändern. Bei Einsatz von Edelstahl sollte keine Pyrolyse durchgeführt werden, da bei mehrfacher Erwärmung auf Pyrolysetemperatur ein Anlaufen der Edelstahloberfläche auftritt, welches optisch unschön ist. Eine Schutzmaßnahme gegen Anlaufen ist die Aufbringung einer dünnen Glasschicht auf sichtbare metallische Oberflächen, aber dadurch ist keine elektrische Kontaktierung mehr möglich, da die zusätzliche Glasschicht elektrisch isolierend wirkt.It becomes more difficult if, for decorative or technical reasons, shiny metallic surface areas are desired. If black sheet metal is used, this would corrode quickly due to the water vapor present inside the cooking space and outside the cooking space and thus change its technical and surface properties. If stainless steel is used, pyrolysis should not be carried out, as repeated heating to pyrolysis temperature causes tarnishing of the stainless steel surface, which is visually unattractive. A protective measure against tarnishing is the application of a thin glass layer on visible metallic surfaces, but this means that electrical contact is no longer possible, since the additional glass layer has an electrically insulating effect.

Es ist deshalb die Aufgabe der vorliegenden Erfindung, eine Gargerätkomponente und ein Verfahren zur Herstellung einer Gargerätkomponente zur Verfügung zu stellen, welche einen zur Durchführung von Pyrolyse geeigneten Garraum umfasst und die wenigstens einige Nachteile aus dem Stand der Technik nicht mehr aufweist.It is therefore the object of the present invention to provide a cooking device component and a method for producing a cooking device component which comprises a cooking space suitable for performing pyrolysis and which no longer has at least some disadvantages from the prior art.

Diese Aufgabe wird gelöst durch eine Gargerätkomponente mit den Merkmalen des Anspruchs 1 und durch ein Verfahren zur Herstellung einer Gargerätkomponente mit den Merkmalen des Anspruchs 9. Bevorzugte Weiterbildungen der Erfindung sind Gegenstand der Unteransprüche. Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus der allgemeinen Beschreibung und der Beschreibung des Ausführungsbeispiels.This object is achieved by a cooking appliance component having the features of claim 1 and by a method for producing a cooking appliance component having the features of Claim 9. Preferred developments of the invention are the subject matter of the subclaims. Further advantages and features of the present invention emerge from the general description and the description of the exemplary embodiment.

Eine erfindungsgemäße Gargerätkomponente weist insbesondere einen zur Durchführung von Pyrolyse geeigneten Garraum auf, wobei die Gargerätkomponente wenigstens eine die Gargerätkomponente wenigstens teilweise begrenzende Komponentenwandung umfasst. Die Komponentenwandung umfasst ein Metallsubstrat mit einer wenigstens teilweise darauf aufgebrachten Emailbeschichtung. Die Garraumwandung weist wenigstens einen von der Emailbeschichtung freigehaltenen und deshalb elektrisch leitfähigen Oberflächenabschnitt zur elektrischen Kontaktierung des Metallsubstrats auf und das Metallsubstrat besteht wenigstens teilweise aus einem sowohl hitzebeständigen als auch austenitischen oder ferritischen Stahl.A cooking device component according to the invention has, in particular, a cooking space suitable for performing pyrolysis, the cooking device component comprising at least one component wall that at least partially delimits the cooking device component. The component wall comprises a metal substrate with an enamel coating applied at least partially thereon. The cooking chamber wall has at least one surface section that is kept free from the enamel coating and is therefore electrically conductive for making electrical contact with the metal substrate, and the metal substrate consists at least partially of a heat-resistant, austenitic or ferritic steel.

Die erfindungsgemäße Gargerätkomponente hat viele Vorteile. Ein erheblicher Vorteil der erfindungsgemäßen Gargerätkomponente besteht darin, dass die Gargerätkomponente pyrolysetauglich ausgebildet ist und gleichzeitig einen elektrisch leitfähigen Oberflächenabschnitt zur elektrischen Kontaktierung des Metallsubstrats aufweist. Dadurch stehen mehr technische und auch dekorative Möglichkeiten der Gestaltung zur Verfügung.The cooking appliance component according to the invention has many advantages. A significant advantage of the cooking device component according to the invention is that the cooking device component is designed to be suitable for pyrolysis and at the same time has an electrically conductive surface section for making electrical contact with the metal substrate. This means that more technical and also decorative design options are available.

Eine erfindungsgemäße Gargerätkomponente kann in einfachen Fällen als Backmuffel ausgebildet sein. Möglich und bevorzugt ist es auch, die Gargerätkomponente als ein Gargerät auszubilden, an dem wenigstens eine pyrolysefähige Backmuffel vorgesehen ist. In besonders bevorzugten Ausgestaltungen ist die Gargerätkomponente grundsätzlich fähig für einen Mikrowellen- oder Hochfrequenzbetrieb. Bei derartigen Anwendungen werden Hochfrequenzstrahlen wie Mikrowellen oder dergleichen in das Innere des Garraumes eingebracht, um das im Inneren des Garraumes vorhandene Gargut wenigstens teilweise über Strahlungsenergie zu erwärmen. Bei derartigen Anwendungen ist eine elektrische Kontaktierung der Garraumwandung in der Regel nötig, um eine zuverlässige Abschirmung zu erreichen. Der Austritt von Hochfrequenzstrahlung aus dem Inneren des Garraumes sollte zuverlässig vermieden werden. Dazu bietet sich an, den Garraum rundum von dem Austritt von Hochfrequenzstrahlung zu schützen. Die Gargerätkomponente kann aber auch als Behälter oder anderes Funktionsteil eines Gargeräts ausgebildet sein, beispielsweise als Dampferzeuger.In simple cases, a cooking appliance component according to the invention can be designed as a baking muffle. It is also possible and preferred to design the cooking device component as a cooking device on which at least one baking muffle capable of pyrolysis is provided. In particularly preferred configurations, the cooking appliance component is basically capable of microwave or high-frequency operation. In such applications, high-frequency rays such as microwaves or the like are introduced into the interior of the cooking space in order to at least partially heat the food present in the interior of the cooking space by means of radiant energy. In such applications, electrical contacting of the cooking chamber wall is usually necessary in order to achieve reliable shielding. The escape of high-frequency radiation from the interior of the cooking space should be reliably avoided. For this purpose, it is advisable to protect the cooking space all around from the escape of high-frequency radiation. The cooking device component can, however, also be designed as a container or other functional part of a cooking device, for example as a steam generator.

Damit ein solcher Schutz zuverlässig und dauerhaft auch bei der Durchführung von Pyrolysevorgängen dauerhaft erhalten bleibt, ist der Einsatz eines austenitischen oder ferritischen hitzebeständigen Stahl sehr vorteilhaft, bei dem ein elektrisch leitfähiger Oberflächenabschnitt zur elektrischen Kontaktierung des Metallsubstrats auch dauerhaft frei von Oxidschichten und dergleichen verbleibt.So that such protection is reliably and permanently retained even when pyrolysis processes are carried out, the use of an austenitic or ferritic heat-resistant steel is very advantageous, in which an electrically conductive Surface section for making electrical contact with the metal substrate also remains permanently free of oxide layers and the like.

Erfindungsgemäß werden austenitische oder ferritische hitzebeständige Stähle verwendet, die auch bei den bei der Emailbeschichtung auftretenden Temperaturen von bis zu 860 °C oder gegebenenfalls 880 °C oder mehr nicht korrodieren, sodass keine oder nur eine geringe Nachbearbeitung der Oberfläche des Substrates erforderlich ist. Dadurch kann ein emailfreier Oberflächenabschnitt an der Garraumwandung direkt bei der Aufbringung der Emailschicht mit hergestellt werden, indem der gewünschte Oberflächenabschnitt beispielsweise vor der Auftragung der Emailschicht entsprechend abgedeckt oder abgeklebt wird, um dort einen metallisch blanken Oberflächenabschnitt zur Verfügung zu stellen. Durch derartige Maßnahmen unter Verwendung der angeführten austenitischen oder ferritischen hitzebeständigen Stähle ist es möglich, das Substrat für die Garraumwandung insgesamt - unter Freilassung des wenigstens einen elektrisch leitfähigen Oberflächenabschnitts - mit einer Emailschicht zu versehen. Dabei tritt keine oder nur eine geringe Beeinträchtigung der elektrischen Leitfähigkeit des elektrisch leitfähigen Oberflächenabschnitts auf. Unter einer geringen Auswirkung auf die elektrische Leitfähigkeit wird hier im Sinne der vorliegenden Erfindung maximal eine vierfache Vergrößerung des elektrischen Widerstandes und insbesondere eine höchstens zweifache oder 1,5 fache Erhöhung des elektrischen Übergangswiderstandes an dem elektrisch leitfähigen Oberflächenabschnitt verstanden.According to the invention, austenitic or ferritic heat-resistant steels are used which do not corrode even at the temperatures of up to 860 ° C or possibly 880 ° C or more that occur during the enamel coating, so that little or no post-processing of the surface of the substrate is required. As a result, an enamel-free surface section on the cooking chamber wall can be produced directly when the enamel layer is applied by covering or taping the desired surface section, for example, before applying the enamel layer, in order to provide a metallically bright surface section there. By means of such measures using the austenitic or ferritic heat-resistant steels mentioned, it is possible to provide the substrate for the cooking chamber wall as a whole with an enamel layer, leaving the at least one electrically conductive surface section free. There is little or no impairment of the electrical conductivity of the electrically conductive surface section. In the context of the present invention, a small effect on the electrical conductivity is understood to mean a maximum of four times the electrical resistance and in particular a maximum of twice or 1.5 times the electrical contact resistance on the electrically conductive surface section.

In besonders bevorzugten Weiterbildungen und Ausgestaltungen besteht das Metallsubstrat wenigstens teilweise aus einem Stahl, der hitzebeständig nach der Norm DIN EN 10095 ist. Besonders bevorzugt besteht das Metallsubstrat vollständig aus einem derartigen Stahl. Unter dem Metallsubstrat wird hier insbesondere die Muffelwandung bzw. die Stahlwandung des Garraumes verstanden.In particularly preferred further developments and configurations, the metal substrate consists at least partially of a steel that is heat-resistant in accordance with the DIN EN 10095 standard. The metal substrate particularly preferably consists entirely of such a steel. The metal substrate is understood here in particular to mean the muffle wall or the steel wall of the cooking chamber.

Der Stahl ist dabei ein rostfreier Stahl. Möglich ist der Einsatz von ferritischen hitzebeständigen Stählen mit der Bezeichnung von Werkstoffnummer und Materialkurzname 1.4742, 1.4762 und gegebenenfalls 1.4724 sowie 1.4713. Möglich und besonders bevorzugt sind austenitische hitzebeständige Stähle mit den Kürzeln 1.4878 und 1.4828 und 1.4821 sowie 1.4876 und 1.4872 und 1.4835. Als vorteilhaft hat sich der Einsatz eines austenitischen hitzebeständigen Stahls aus der Gruppe 1.4841 herausgestellt. Stähle aus der Gruppe 1.4841 sind hitzebeständig bis 1120 °C in Luft und weisen Bestandteile von Kohlenstoff, Chrom, Nickel, Silizium und gegebenenfalls Aluminium auf.The steel is a stainless steel. It is possible to use ferritic heat-resistant steels with the designation of material number and material short name 1.4742, 1.4762 and possibly 1.4724 and 1.4713. Austenitic heat-resistant steels with the abbreviations 1.4878 and 1.4828 and 1.4821 as well as 1.4876 and 1.4872 and 1.4835 are possible and particularly preferred. The use of an austenitic heat-resistant steel from group 1.4841 has proven to be advantageous. Steels from group 1.4841 are heat-resistant up to 1120 ° C in air and contain components of carbon, chromium, nickel, silicon and possibly aluminum.

Besonders bevorzugt weist das Metallsubstrat eine wenigstens teilweise und insbesondere vollständig aufgeraute Oberfläche auf. Eine derartige Ausgestaltung ist besonders vorteilhaft, da Edelstähle, wie zuvor genannt, und auch andere Edelstähle eine verringerte Haftung zwischen dem Stahl und einer Emailschicht aufweisen. Es ist möglich, eine zusätzliche Haftvermittlungsschicht vor der Auftragung einer Emailschicht auf das Substrat aufzubringen, aber dadurch wird regelmäßig die elektrische Kontaktierung des Metallsubstrats verhindert oder wenigstens doch ganz erheblich verschlechtert. Das bedeutet, dass nach der Aufbringung der Emailschicht dann ein aufwendiger Nachbearbeitungsschritt erfolgen muss, um eine elektrische Kontaktierung des Metallsubstrats zu ermöglichen und für die gewünschten Anwendungsfälle in ausreichender Qualität zur Verfügung zu stellen.The metal substrate particularly preferably has an at least partially and in particular completely roughened surface. Such a configuration is particularly advantageous since stainless steels, as mentioned above, and also other stainless steels have reduced adhesion between the steel and an enamel layer. It is possible to apply an additional bonding layer to the substrate before an enamel layer is applied, but this usually prevents or at least considerably worsens the electrical contacting of the metal substrate. This means that after the enamel layer has been applied, a complex post-processing step must then take place in order to enable electrical contact to be made with the metal substrate and to provide it in sufficient quality for the desired applications.

Es hat sich nun überraschend herausgestellt, dass eine aufgeraute Oberfläche des Metallsubstrats eine erheblich verbesserte und ausreichende Haftung der Emailschicht an dem hochlegierten Spezialstahl des Metallsubstrats ermöglicht. Erfolgt eine solches Aufrauen beispielsweise mit einem 80iger Korn, so kann eine vernünftige und ausreichende Haftung erreicht werden.It has now surprisingly been found that a roughened surface of the metal substrate enables a considerably improved and sufficient adhesion of the enamel layer to the high-alloy special steel of the metal substrate. If such a roughening is carried out, for example, with an 80 grain, then a reasonable and sufficient adhesion can be achieved.

Besonders bevorzugt wird die Oberfläche des Metallsubstrats durch Bürsten wenigstens teilweise aufgeraut. Möglich ist es auch, die Oberfläche des Metallsubstrats durch Schleifen oder zum Beispiel Sandstrahlen wenigstens teilweise aufzurauen. Möglich ist es auch, 2 oder 3 unterschiedliche Verfahren zur Herstellung der aufgerauten Oberfläche anzuwenden. Das Bürsten hat sich als besonders vorteilhaft herausgestellt, da damit zuverlässig und reproduzierbar eine in sich spannungsarme und aufgeraute Oberfläche des Metallsubstrats zur Verfügung gestellt werden kann. Wird ein Sandstrahlverfahren eingesetzt, kann dies zu einer lokalen Verdichtung der Oberfläche führen, was an der Garraumwandung dann zu unerwünschten gebogenen oder verbogenen Oberflächen führen kann, wenn die Parameter des Sandstrahlvorgangs ungünstig gewählt sind.The surface of the metal substrate is particularly preferably at least partially roughened by brushing. It is also possible to at least partially roughen the surface of the metal substrate by grinding or, for example, sandblasting. It is also possible to use 2 or 3 different methods for producing the roughened surface. Brushing has proven to be particularly advantageous, since it can reliably and reproducibly provide a roughened surface of the metal substrate with little tension. If a sandblasting process is used, this can lead to a local compression of the surface, which can then lead to undesirable curved or bent surfaces on the cooking chamber wall if the parameters of the sandblasting process are chosen unfavorably.

Besonders bevorzugt wird die Oberfläche des Metallsubstrats beidseitig aufgeraut. Das ist aus verschiedenen Gründen bevorzugt, auch da aufgrund möglicher auftretender Spannungen durch den "Bimetall-Effekt" Spannungen in dem Metallsubstrat auftreten können.The surface of the metal substrate is particularly preferably roughened on both sides. This is preferred for various reasons, also because stresses may occur in the metal substrate due to the possible stresses caused by the “bimetal effect”.

Es haben sich bestimmte Parameter der Oberfläche des Metallsubstrats als besonders geeignet herausgestellt. Insbesondere wird ein Mittenrauwert Ra zwischen etwa 1 µm und 4 µm bevorzugt. Besonders vorteilhaft sind Mittenrauwerte zwischen 2 µm und 3 µm. Unter dem Mittenrauwert wird hier der arithmetische Mittenrauwert verstanden.Certain parameters of the surface of the metal substrate have proven to be particularly suitable. In particular, a mean roughness value Ra between approximately 1 μm and 4 μm is preferred. Average roughness values between 2 µm and 3 µm are particularly advantageous. The mean roughness value is understood here to mean the arithmetic mean roughness value.

Besonders bevorzugt weist die Oberfläche des Metallsubstrats eine Rautiefe Rz zwischen etwa 10 µm und 40 µm auf. Vorteilhaft ist eine Rautiefe Rz zwischen etwa 15 µm und 25 µm. Unter der Rautiefe wird hier die gemittelte Rautiefe verstanden und nicht direkt die Tiefe einzelner Riefen oder Stellen oder Furchen an der Oberfläche des Metallsubstrats.The surface of the metal substrate particularly preferably has a roughness depth Rz between approximately 10 μm and 40 μm. A roughness depth Rz between approximately 15 µm and 25 µm is advantageous. Under the roughness depth is understood here as the mean roughness depth and not directly the depth of individual grooves or points or furrows on the surface of the metal substrate.

Besonders bevorzugt weist das Metallsubstrat wenigstens eine sandgestrahlte Schweißnaht auf. Vorzugsweise wird das Metallsubstrat zu einer Garraummuffel oder dergleichen umgebogen und die beiden Enden werden an der Stoßkante miteinander verschweißt, um eine rundum geschlossene Backmuffel oder dergleichen zur Verfügung zu stellen. Es ist auch möglich und bevorzugt, die Schweißnaht zu bürsten, um dort die gewünschte Oberflächengenauigkeit zu erzielen. Im Bereich der Schweißnaht kann es aber kostengünstiger und/oder einfacher sein eine (lokale) Sandstrahlung vorzunehmen.The metal substrate particularly preferably has at least one sand-blasted weld seam. The metal substrate is preferably bent over to form a baking muffle or the like and the two ends are welded to one another at the abutting edge in order to provide a completely closed baking muffle or the like. It is also possible and preferred to brush the weld seam in order to achieve the desired surface accuracy there. However, (local) sandblasting can be more cost-effective and / or easier in the area of the weld seam.

Erfindungsgemäß weist das Metallsubstrat wenigstens einen emailfreien Oberflächenabschnitt auf.According to the invention, the metal substrate has at least one enamel-free surface section.

In besonders bevorzugten Ausgestaltungen ist das Metallsubstrat mit 2 aufeinander aufgetragenen Emailschichten beschichtet, die insbesondere separat gebrannt sind. Möglich ist es aber auch, 2 Emailschichten nacheinander aufzutragen und in einem Brennvorgang gemeinsam zu brennen.In particularly preferred refinements, the metal substrate is coated with two enamel layers applied one on top of the other, which in particular are fired separately. But it is also possible to apply 2 layers of enamel one after the other and burn them together in one firing process.

Die Aufbringung einer ersten Emailschicht auf das Metallsubstrat und das anschließende Brennen der ersten Emailschicht ermöglicht es beispielsweise, die Zutaten und die Mischungsverhältnisse in der ersten Emailschlickerschicht anders zu wählen als in der zweiten Emailschlickerschicht, die auf die schon fertig gebrannte erste Emailschicht aufgetragen wird. Dadurch kann auf die unterschiedlichen Untergründe für die erste Emailschicht und die zweite Emailschicht entsprechend reagiert werden. Für die erste Emailschicht liegt das blanke und aufgeraute Metallsubstrat als Oberfläche vor, während die zweite Emailschicht auf eine schon vorhandene Emailschicht aufgetragen wird, sodass sich die Haftungsbedingungen für die jeweiligen Emailschichten grundlegend unterscheiden.The application of a first enamel layer to the metal substrate and the subsequent firing of the first enamel layer makes it possible, for example, to choose the ingredients and the mixing ratios in the first enamel slip layer differently than in the second enamel slip layer, which is applied to the already completely fired first enamel layer. In this way, it is possible to react accordingly to the different substrates for the first enamel layer and the second enamel layer. For the first enamel layer, the bare and roughened metal substrate is the surface, while the second enamel layer is applied to an existing enamel layer, so that the adhesion conditions for the respective enamel layers differ fundamentally.

Das erfindungsgemäße Verfahren dient zur Herstellung einer Gargerätkomponente, insbesondere mit einem zur Durchführung von Pyrolyse geeigneten Garraum, wobei eine die Gargerätkomponente wenigstens teilweise bildende Komponentenwandung aus einem Metallsubstrat gefertigt wird, auf das wenigstens teilweise eine Emailbeschichtung aufgebracht wird. Dabei wird für das Metallsubstrat wenigstens teilweise ein austenitischer oder ferritischer hitzebeständiger Stahl verwendet und die Emailbeschichtung wird so aufgebracht, dass an der Komponentenwandung wenigstens ein elektrisch leitfähiger Oberflächenabschnitt zur elektrischen Kontaktierung des Metallsubstrats verbleibt.The method according to the invention is used to produce a cooking device component, in particular with a cooking space suitable for performing pyrolysis, a component wall which at least partially forms the cooking device component is made from a metal substrate to which an enamel coating is at least partially applied. In this case, an austenitic or ferritic heat-resistant steel is at least partially used for the metal substrate and the enamel coating is applied in such a way that at least one electrically conductive surface section remains on the component wall for making electrical contact with the metal substrate.

Auch das erfindungsgemäße Verfahren hat viele Vorteile, da es eine kostengünstige und einfache Herstellung einer erfindungsgemäßen Gargerätkomponente erlaubt. Dabei wird bei der Herstellung ein elektrisch leitfähiger Oberflächenabschnitt zur elektrischen Kontaktierung des Metallsubstrats der Komponentenwandung direkt mit hergestellt. Eine aufwendige Nachbearbeitung ist nicht nötig, um die Komponentenwandung elektrisch zu kontaktieren.The method according to the invention also has many advantages, since it allows an inexpensive and simple production of a cooking device component according to the invention. In this case, an electrically conductive surface section for making electrical contact with the metal substrate of the component wall is also produced directly during production. Elaborate post-processing is not necessary in order to make electrical contact with the component wall.

Vorzugsweise wird das Metallsubstrat wenigstens abschnittsweise und insbesondere im Wesentlichen vollständig und besonders bevorzugt vollständig vor dem Auftragen der Emailbeschichtung aufgeraut. Dadurch wird eine verbesserte Haftung der Emailbeschichtung an dem Metallsubstrat erlaubt, sodass auch dauerhaft und zuverlässig eine Haftung der Emailbeschichtung an dem Metallsubstrat gewährleistet wird. Eine zu geringe Haftung könnte bei mehrfachen Pyrolysevorgängen und den dabei auftretenden thermischen Spannungen aufgrund der Erwärmung und Ausdehnung des Metallsubstrats zu einem unerwünschten Lösen der Emailschicht und somit zu einer Zerstörung der Gargerätkomponente führen. Deshalb ist eine zuverlässige Haftung bei den im Betrieb auftretenden hohen thermischen Belastungen sehr wichtig.The metal substrate is preferably roughened at least in sections and in particular essentially completely and particularly preferably completely before the enamel coating is applied. This allows improved adhesion of the enamel coating to the metal substrate, so that permanent and reliable adhesion of the enamel coating to the metal substrate is also ensured. In the case of multiple pyrolysis processes and the resulting thermal stresses due to the heating and expansion of the metal substrate, insufficient adhesion could lead to undesired loosening of the enamel layer and thus to destruction of the cooking appliance component. Therefore, reliable adhesion is very important in the case of the high thermal loads that occur during operation.

Besonders bevorzugt werden wenigstens 2 Emailschichten aufgetragen, nämlich zunächst eine Grundemailschicht und danach eine Deckemailschicht. Dabei ist es möglich, dass zunächst eine Grundemailschicht aufgetragen wird, die nach dem Auftragen der Schicht gebrannt wird. Nach dem Brennen und entsprechenden Abkühlen des Metallsubstrats wird die Deckemailschicht aufgetragen und in einem separaten Brennvorgang gebrannt.At least two enamel layers are particularly preferably applied, namely first a base enamel layer and then a top enamel layer. It is possible that a base enamel layer is applied first, which is then fired after the layer has been applied. After the metal substrate has been fired and cooled accordingly, the top enamel layer is applied and fired in a separate firing process.

In anderen Ausgestaltungen ist es auch möglich, die Grundemailschicht und die Deckemailschicht nacheinander aufzutragen, aber in einem gemeinsamen Brennvorgang zu brennen.In other configurations it is also possible to apply the base enamel layer and the top enamel layer one after the other, but to fire them in a common firing process.

Besonders bevorzugt wird für die Grundemailschicht eine erheblich geringere Kornfeinheit verwendet als für die Deckemailschicht. Vorzugsweise wird für den Grundemailschlicker eine Kornverteilung eingesetzt, die bei der Prüfung mit dem BayerSieb 16.900 M pro Zentimeterquadrat eine Mahlfeinheit von 4-6 zeigt. Der Feinkornanteil des Grundemailschlickers bis zu einer Größe von 5 µm sollte 15-30 % betragen und insbesondere zwischen 20 und von 2,5 % liegen. Der Feinkornanteil bis zu einer Größe der Emailteilchen von bis zu 50 µm oder 60 µm Durchmesser sollte bei mindestens 90 % liegen. Für die Deckemailschicht kann eine Emailschlickerschicht mit gröberen Emailteilchen eingesetzt werden. Dort kann eine Kornverteilung vorliegen, die bei der Prüfung mit dem BayerSieb 16.900 M pro Quadratzentimeter eine Mahlfeinheit von 20-25 oder dergleichen anzeigt. Möglich ist für die Deckemailschicht auch eine andere Kornfeinheit.It is particularly preferred to use a significantly lower grain size for the base enamel layer than for the top enamel layer. A particle size distribution is preferably used for the base enamel slip that shows a grind fineness of 4-6 when tested with the Bayer sieve 16,900 M per centimeter square. The fine grain fraction of the base enamel slip up to a size of 5 µm should be 15-30% and in particular between 20 and 2.5%. The fine grain fraction up to a size of the enamel particles of up to 50 µm or 60 µm in diameter should be at least 90%. An enamel slip layer with coarser enamel particles can be used for the top enamel layer. There may be a particle size distribution that shows a grinding fineness of 20-25 or the like when tested with the Bayer sieve 16,900 M per square centimeter. A different grain fineness is also possible for the top enamel layer.

Besonders bevorzugt wird für jede Emailschicht zunächst eine separate Emailschlickerschicht aufgetragen, die anschließend insbesondere separat gebrannt wird. Für die Grundemailschicht sind Brenntemperaturen von 780 °C bis 835 °C bevorzugt. Besonders bevorzugt werden Temperaturen von zwischen 800 °C und 830 °C eingesetzt. Bei dem Brennvorgang für die Deckemailschicht können Brenntemperaturen von 840 °C bis 850 °C eingesetzt werden.Particularly preferably, a separate enamel slip layer is first applied for each enamel layer, which is then in particular fired separately. Firing temperatures of 780 ° C. to 835 ° C. are preferred for the base enamel layer. Temperatures of between 800 ° C. and 830 ° C. are particularly preferably used. During the firing process for the top enamel layer, firing temperatures of 840 ° C to 850 ° C can be used.

In besonders bevorzugten Ausgestaltungen ist die Emailschlickerschicht der Grundemailschicht dünner als die Emailschlickerschicht der Deckemailschicht. Es ist ebenso bevorzugt, dass die Grundemailschicht eine geringere Dicke aufweist als die Deckemailschicht. Vorzugsweise findet das Auftragen derart statt, dass ein Verhältnis einer Schichtdicke der Deckemailschicht zu der Schichtdicke der Grundemailschicht zwischen 0,75 und 2 und insbesondere zwischen 1 und 1,5 beträgt.In particularly preferred embodiments, the enamel slip layer of the base enamel layer is thinner than the enamel slip layer of the top enamel layer. It is also preferred that the base enamel layer has a smaller thickness than the top enamel layer. The application preferably takes place in such a way that a ratio of a layer thickness of the top enamel layer to the layer thickness of the base enamel layer is between 0.75 and 2 and in particular between 1 and 1.5.

Weitere Vorteile und Merkmale der vorliegenden Erfindung ergeben sich aus dem Ausführungsbeispiel, das im Folgenden mit Bezug auf die beiliegenden Figuren erläutert wird.Further advantages and features of the present invention emerge from the exemplary embodiment which is explained below with reference to the accompanying figures.

In den Figuren zeigen:

Figur 1
eine schematische Vorderansicht eines erfindungsgemäßen Gargeräts; und
Figur 2
einen stark schematischen und vergrößerten Querschnitt durch einen Abschnitt der Garraumwandung;
In the figures show:
Figure 1
a schematic front view of a cooking appliance according to the invention; and
Figure 2
a highly schematic and enlarged cross section through a portion of the cooking space wall;

Figur 1 zeigt eine stark schematische Vorderansicht einer Gargerätkomponente 1, welche hier insgesamt als Gargerät 100 ausgebildet ist und eine Backmuffel 10 umfasst. Es ist auch möglich, dass die Gargerätkomponente 1 nur die Backmuffel 10 oder nur eine Komponentenwandung 3 oder einen Behälter oder ein weiteres Funktionsteil eines Gargeräts umfasst oder als solche ausgebildet ist. Im gezeigten Ausführungsbeispiel wird die Komponentenwandung 3 durch eine Garraumwandung gebildet, die deshalb nachfolgend mit dem gleichen Bezugszeichen 3 versehen ist. Figure 1 shows a highly schematic front view of a cooking device component 1, which is designed here as a whole as a cooking device 100 and includes a baking muffle 10. It is also possible that the cooking device component 1 comprises only the baking muffle 10 or only one component wall 3 or a container or a further functional part of a cooking device or is designed as such. In the exemplary embodiment shown, the component wall 3 is formed by a cooking chamber wall, which is therefore given the same reference number 3 below.

Das Gargerät 100 weist einen durch die Backmuffel 10 zur Verfügung gestellten Garraum 2 auf, der seitlich und nach hinten hin durch eine Garraumwandung 3 begrenzt wird. Vorn ist eine Tür vorgesehen.The cooking appliance 100 has a cooking space 2 made available by the baking muffle 10, which is bounded laterally and towards the rear by a cooking space wall 3. A door is provided at the front.

Die Garraumwandung 3 besteht aus einem Metallsubstrat 4, auf das eine Emailbeschichtung 5 auf die Oberflächen 7 und 8 auf der Außenseite und der Innenseite des Garraumes 2 aufgebracht ist.The cooking chamber wall 3 consists of a metal substrate 4 to which an enamel coating 5 is applied to the surfaces 7 and 8 on the outside and the inside of the cooking chamber 2.

Die Garraumwandung 3 wird aus einem ursprünglich flachen Metallsubstrat 4 hergestellt, welches umgeformt wird, um den Garraum zu bilden. An den Stoßkanten an den Enden ist eine Schweißnaht 9 vorgesehen, um einen rundum dichten Garraum 2 zur Verfügung zu stellen. Die Schweißnaht 9 ist hier in einer Ecke des Garraumes 2 eingezeichnet, kann aber grundsätzlich an beliebigen Stellen des Garraumes 2 vorgesehen sein.The cooking space wall 3 is made from an originally flat metal substrate 4, which is reshaped to form the cooking space. A weld seam 9 is provided on the abutting edges at the ends in order to provide an all-round sealed cooking space 2. The weld seam 9 is shown here in a corner of the cooking space 2, but can in principle be provided at any point in the cooking space 2.

Figur 2 zeigt einen stark vergrößerten Querschnitt eines Abschnitts der Garraumwandung 3. In dem Querschnitt ist das Metallsubstrat 4 schematisch eingezeichnet. Sowohl die äußere Oberfläche 7 als auch die innere Oberfläche 8 des Metallsubstrats 4 sind erfindungsgemäß mit einer Emailschicht bedeckt, die eine Dicke 12 aufweist. Möglich ist es auch, dass die Oberfläche 7 die innere Oberfläche der Gargerätkomponente 1 bildet und dass die Oberfläche 8 auf der Außenseite des Garraumes 2 angeordnet ist. Figure 2 shows a greatly enlarged cross section of a portion of the cooking space wall 3. The metal substrate 4 is shown schematically in the cross section. According to the invention, both the outer surface 7 and the inner surface 8 of the metal substrate 4 are covered with an enamel layer which has a thickness 12. It is also possible that the surface 7 forms the inner surface of the cooking appliance component 1 and that the surface 8 is arranged on the outside of the cooking space 2.

In dem in Figur 2 dargestellten vergrößerten schematischen Querschnitt ist der emailfreie Oberflächenabschnitt 13 an dem Oberflächenabschnitt 6 dargestellt, wo auf dem Metallsubstrat 4 keine Emailschicht 5 vorgesehen ist. In dem Oberflächenabschnitt 6 ist die metallische Oberfläche des Metallsubstrats 4 direkt zugänglich. Dadurch ist ein elektrisch leitender Anschluss des Metallsubstrats 4 und somit der Garraumwandung 3 möglich, um eine elektrische Abschirmung zur Verfügung zu stellen.In the in Figure 2 In the enlarged schematic cross section shown, the enamel-free surface section 13 is shown at the surface section 6 where no enamel layer 5 is provided on the metal substrate 4. In the surface section 6 the metallic surface of the metal substrate 4 is directly accessible. As a result, an electrically conductive connection of the metal substrate 4 and thus of the cooking space wall 3 is possible in order to provide electrical shielding.

Das Garsubstrat 4 weist eine raue Oberfläche auf, die hier durch Bürsten der ursprünglich im Wesentlichen glatten Oberfläche des Metallsubstrats erzeugt wurde. Möglich ist es auch, die Oberflächen 7 und/oder 8 des Metallsubstrats 4 durch Schleifen oder Nadeln oder gegebenenfalls Sandstrahlen aufzurauen, um so eine vernünftige und ausreichende Oberflächenrauigkeit wenigstens einer Oberfläche 7, 8 des Metallsubstrats zur Verfügung zu stellen.The cooking substrate 4 has a rough surface, which was produced here by brushing the originally essentially smooth surface of the metal substrate. It is also possible to roughen the surfaces 7 and / or 8 of the metal substrate 4 by grinding or needling or optionally sandblasting, in order to provide a reasonable and sufficient surface roughness of at least one surface 7, 8 of the metal substrate.

Vorzugsweise werden beide Oberflächen 7 und 8 auf grundsätzlich gleiche Art und Weise aufgeraut und - abgesehen von wenigstens einem Oberflächenabschnitt 6 - im Wesentlichen vollständig mit der Emailschicht 5 bedeckt. Dadurch wird ein elektrisch leitender Anschluss der Garraumwandung 3 ermöglicht, um einen Austritt von Hochfrequenzstrahlung wie beispielsweise Mikrowellenstrahlung oder dergleichen aus dem Garraum 2 zuverlässig zu verhindern.Both surfaces 7 and 8 are preferably roughened in basically the same way and - apart from at least one surface section 6 - are essentially completely covered with the enamel layer 5. This enables an electrically conductive connection of the cooking chamber wall 3 in order to reliably prevent high-frequency radiation such as microwave radiation or the like from escaping from the cooking chamber 2.

Das Metallsubstrat 4 besteht aus einem austenitischen oder ferritischen hitzebeständigen Stahl. Möglich ist es, dass die Garraumwandung aus mehreren Substratsteilen gebildet wird, wobei dann aber wenigstens ein Metallsubstrat aus einem derartigen hitzebeständigen austenitischen oder ferritischen Stahl besteht. Dabei ist an dem Metallsubstrat, an dem ein elektrisch leitfähiger Oberflächenabschnitt vorgesehen und ausgebildet ist, dieses Metallsubstrat aus einem austenitischen oder ferritischen hitzebeständigen Stahl gefertigt. Besonders bevorzugt wird ein Stahl der Materialklasse 1.4841 verwendet, welches sowohl bei den hohen Temperaturen zur Einbringung der Emailschicht als auch bei den späteren Betriebstemperaturen auf Pyrolyseniveau zuverlässig vor Korrosion geschützt ist. Dadurch kann ein dauerhaft zuverlässiger elektrisch leitender Anschluss an die Garraumwandung 3 ermöglicht werden.The metal substrate 4 consists of an austenitic or ferritic heat-resistant steel. It is possible that the cooking chamber wall is formed from several substrate parts, but then at least one metal substrate consists of such a heat-resistant austenitic or ferritic steel. In this case, this metal substrate is made of an austenitic or ferritic heat-resistant steel on the metal substrate on which an electrically conductive surface section is provided and formed. A steel of the material class 1.4841 is particularly preferably used, which is used both at the high temperatures the enamel layer as well as at the later operating temperatures at pyrolysis level is reliably protected from corrosion. This enables a permanently reliable electrically conductive connection to the cooking chamber wall 3.

Das ursprünglich glatte Metallsubstrat wird vorzugsweise beidseitig aufgeraut, um Spannungen aufgrund unterschiedlicher Oberflächenbehandlungen beider Seiten zuverlässig zu vermeiden.The originally smooth metal substrate is preferably roughened on both sides in order to reliably avoid tensions due to different surface treatments on both sides.

Die Oberflächen 7 und 18 werden besonders bevorzugt derart aufgeraut, dass ein arithmetischer Mittenrauwert Ra von zwischen 2 µm und 3 µm vorliegt. Besonders bevorzugt weist wenigstens eine Oberfläche 7, 8 des Metallsubstrats 4 eine Rautiefe Rz zwischen etwa 15 µm und 25 µm und besonders bevorzugt etwa 20 µm auf.The surfaces 7 and 18 are particularly preferably roughened in such a way that an arithmetic mean roughness value Ra of between 2 μm and 3 μm is present. At least one surface 7, 8 of the metal substrate 4 particularly preferably has a surface roughness Rz between approximately 15 μm and 25 μm and particularly preferably approximately 20 μm.

Die mittlere Rauheit entspricht vorzugsweise dem arithmetischen Mittel der Abweichung des Abstandes der Oberflächenpunkte von der Mittellinie. Bei einer eindimensionalen Erstreckung würde die mittlere Rauheit die Höhe des Rechtecks ergeben, dass die gleiche Länge wie die zu untersuchende Strecke und den gleichen Flächeninhalt wie die Fläche zwischen der Bezugshöhe und dem Profil hat. In entsprechender Weise wird über bekannte Verfahren die gemittelte Rautiefe ermittelt.The mean roughness preferably corresponds to the arithmetic mean of the deviation of the distance between the surface points from the center line. In the case of a one-dimensional extension, the mean roughness would result in the height of the rectangle that has the same length as the route to be examined and the same area as the area between the reference height and the profile. The averaged roughness depth is determined in a corresponding manner using known methods.

Die Tiefe 11 einzelner Riefen oder Stellen stimmt deshalb regelmäßig nicht mit der mittleren Rauheit oder der gemittelten Rautiefe überein, sondern es erfolgt eine statistische Auswertung.The depth 11 of individual grooves or points therefore regularly does not correspond to the mean roughness or the mean roughness depth, but a statistical evaluation takes place.

Das ursprüngliche glatte Metallsubstrat 4 aus dem austenitischen oder ferritischen hitzebeständigen Stahl wird zur Herstellung der Gargerätkomponente 1 zunächst vorzugsweise beidseitig auf den Oberflächen 7,8 durch Bürsten oder dergleichen aufgeraut. Im Anschluss daran wird nach einem gegebenenfalls erfolgenden Reinigungsschritt eine erste Emailschlickerschicht 16 aufgetragen, die nur schematisch in Figur 2 gestrichelt angedeutet ist.The original smooth metal substrate 4 made of the austenitic or ferritic heat-resistant steel is first of all roughened, preferably on both sides of the surfaces 7, 8, by brushing or the like, to produce the cooking device component 1. Following this, after a cleaning step that may take place, a first enamel slip layer 16 is applied, which is only shown schematically in FIG Figure 2 is indicated by dashed lines.

Bei der Emailschlickerschicht 16 wird eine Dichte die Emailschlickerschicht 16 zwischen vorzugsweise 1,62 und 1,68 g je Kubikzentimeter eingestellt. Es wird eine feine Kornverteilung in der Emailschlickerschicht verwendet, die bei der Prüfung mit einem BayerSieb 16.900 M pro Quadratzentimeter eine Mahlfeinheit von 4-6 zeigt. Dabei liegt der Feinkornanteil bis 5 µm zwischen 20 und 25 % und der Gesamtanteil der Emailteilchen bis zu einem Durchmesser von 50 µm bei mindestens 90 %. Nach Zugabe von VE-Wasser (vollentsalztes Wasser) werden übliche Mahl-, Stell-und Schlickerhilfsmittel angepasst und es wird die Emailschlickerschicht 16 auf hier die Oberfläche 7 des Metallsubstrats 4 aufgetragen. Vorher wird vorzugsweise der Oberflächenabschnitt 6 abgedeckt oder abgeklebt, damit dieser Oberflächenabschnitt 6 nicht mit einer Emailbeschichtung versehen wird.In the case of the enamel slip layer 16, the density of the enamel slip layer 16 is set between preferably 1.62 and 1.68 g per cubic centimeter. A fine grain distribution is used in the enamel slip layer, which shows a grinding fineness of 4-6 when tested with a Bayer sieve 16,900 M per square centimeter. The fine grain fraction up to 5 µm is between 20 and 25% and the total fraction of enamel particles up to a diameter of 50 µm is at least 90%. After adding deionized water (fully demineralized water), customary grinding, adjusting and slip auxiliaries are adapted and the enamel slip layer 16 is applied to the surface 7 of the metal substrate 4 here. The surface section 6 is preferably covered or masked beforehand so that this surface section 6 is not provided with an enamel coating.

Im Anschluss darin wird die Emailschlickerschicht 16 bei Temperaturen zwischen 20 und 80°C getrocknet, bis die Restfeuchte des Emailbisquits nach der Trocknung geringer als 4 % und insbesondere geringer als 2 % ist. Im Anschluss daran kann die Abdeckung für den Oberflächenabschnitt 6 entfernt werden und es erfolgt ein Einbrennen der ersten bzw. inneren Emailschicht 15, die im fertigen Zustand vorzugsweise eine Schichtdicke zwischen 60 und 120 µm und vorzugsweise zwischen 80 und 100 µm aufweist. Das Einbrennen der Emailschicht erfolgt vorzugsweise bei Temperaturen, die maximal 830° betragen. Das Einbrennen erfolgt vorzugsweise mit verminderter Geschwindigkeit und angepasster Aufheizung und Abkühlung, um die gewünschten Haftbedingungen zu erreichen.The enamel slip layer 16 is then dried therein at temperatures between 20 and 80 ° C. until the residual moisture of the enamel bisque after drying is less than 4% and in particular less than 2%. The cover for the surface section 6 can then be removed and the first or inner enamel layer 15 is burned in, which in the finished state preferably has a layer thickness between 60 and 120 μm and preferably between 80 and 100 μm. The enamel layer is preferably burned in at temperatures which are a maximum of 830 °. The stoving is preferably carried out at a reduced speed and with appropriate heating and cooling in order to achieve the desired adhesion conditions.

Im Anschluss daran kann die zweite in Figur 2 ebenfalls schematisch gestrichelt angedeutete zweite oder äußere Emailschlickerschicht 26 auf die nun fertige Emailschicht 15 aufgebracht werden, wobei wiederum der Oberflächenabschnitt 6 ausgespart wird. Die Emailschlickerschicht 26 kann mit herkömmlichen Dichten zwischen etwa 1,7 und 1,82 g je Kubikzentimeter aufgetragen werden, wobei die Kornverteilung des Grundemails eine Mahlfeinheit von beispielsweise 20-25, gemessen mit einem BayerSieb 16.900 M pro Quadratzentimeter aufweist. Das Einbrennen und das Trocknen der zweiten Emailschicht 25 kann im Wesentlichen konventionell erfolgen, da die Haftung an der ersten Emailschicht 15 den üblichen Anforderungen genügt.The second in Figure 2 The second or outer enamel slip layer 26, also indicated schematically by dashed lines, can be applied to the now finished enamel layer 15, the surface section 6 being cut out again. The enamel slip layer 26 can be applied with conventional densities between about 1.7 and 1.82 g per cubic centimeter, the grain distribution of the base enamel having a fineness of grinding of, for example, 20-25, measured with a Bayer sieve 16,900 m per square centimeter. The baking and drying of the second enamel layer 25 can essentially take place in a conventional manner, since the adhesion to the first enamel layer 15 meets the usual requirements.

Insgesamt stellt die Erfindung eine vorteilhafte Gargerätkomponente 1 zur Verfügung, bei der ein austenitischer oder ferritischer hitzebeständiger Stahl für das Metallsubstrat 4 verwendet wird und wobei das Metallsubstrat im Wesentlichen mit wenigstens einer Emailbeschichtung an der Innenseite und einer Emailbeschichtung an der Außenseite beschichtet wird. Dabei bleibt wenigstens ein Oberflächenabschnitt frei und kann elektrisch leitfähig und ohne besondere Nacharbeit kontaktiert werden. Um die nötige Haftung zu erreichen, wird die Oberfläche des Metallsubstrats 4 definiert aufgeraut, wobei sich ein 80iger Korn als vorteilhaft erwiesen hat. Die Aufrauung mit einem zu groben oder zu feinen Korn hat hingegen nicht zu den gewünschten Ergebnissen geführt.Overall, the invention provides an advantageous cooking device component 1 in which an austenitic or ferritic heat-resistant steel is used for the metal substrate 4 and the metal substrate is essentially coated with at least one enamel coating on the inside and an enamel coating on the outside. At least one surface section remains free and contact can be made in an electrically conductive manner without any special reworking. In order to achieve the necessary adhesion, the surface of the metal substrate 4 is roughened in a defined manner, an 80 grain having proven to be advantageous. Roughening with a grain that is too coarse or too fine, however, did not lead to the desired results.

Die Aufbringung einer separaten Haftvermittlung auf beispielsweise Nickelbasis ist bei der vorliegenden Erfindung nicht nötig. Die Oberfläche des austenitischen oder ferritischen hitzebeständigen Stahls wird direkt aufgeraut und darauf wird direkt eine erste Emailschicht und danach eine zweite Emailschicht aufgetragen.The application of a separate adhesion promoter based on nickel, for example, is not necessary with the present invention. The surface of the austenitic or ferritic heat-resistant steel is roughened directly and a first layer of enamel and then a second layer of enamel is applied directly to it.

Mit der Erfindung wird es ermöglicht, Pyrolysegeräte zur Verfügung zu stellen, die metallisch blanke Oberflächen aufweisen, um die Garraumwandung elektrisch zu kontaktieren oder entsprechende optische Eigenschaften zu erzielen.The invention makes it possible to provide pyrolysis devices which have bright metallic surfaces in order to make electrical contact with the cooking chamber wall or to achieve corresponding optical properties.

BezugszeichenlisteList of reference symbols

11
GargerätkomponenteCooking device component
22
GarraumCooking space
33
KomponantenwandungComponent wall
44th
MetallsubstratMetal substrate
55
EmailbeschichtungEnamel coating
66th
OberflächenabschnittSurface section
77th
Oberflächesurface
88th
Oberflächesurface
99
SchweißnahtWeld
1010
BackmuffelBaker
1111
Tiefedepth
1212th
Dickethickness
1313
Emailfreier OberflächenabschnittEnamel-free surface section
1515th
(innere) Emailschicht(inner) enamel layer
1616
EmailschlickerschichtEnamel slip layer
2525th
(äußere) Emailschicht(outer) enamel layer
2626th
EmailschlickerschichtEnamel slip layer
100100
GargerätCooking appliance
RaRa
MittenrauwertMean roughness
RzMargin no
gemittelte Rautiefemean roughness

Claims (15)

  1. Cooking appliance component (1), in particular comprising a cooking chamber (2) suitable for carrying out pyrolysis, and comprising a component wall (3) that delimits the cooking appliance component (1) at least in part, the component wall (3) comprising a metal substrate (4) that has an enamel coating (5) applied thereto at least in part, the component wall (3) having at least one surface portion (6) which is kept free of the enamel coating (5) and is therefore electrically conductive, which portion is intended for making electrical contact with the metal substrate (4), characterised in that the electrical contact resistance at the electrically conductive surface portion (6) after the enamel coating (5) has been applied to the metal substrate (4) is increased to a maximum of four times, in particular to at most twice or 1.5 times, in that both the outer surface (7) and the inner surface (8) of the metal substrate (4), apart from the surface portion (6), are substantially completely covered with an enamel layer, and in that the metal substrate (4) consists at least in part of a heat-resistant and also austenitic or ferritic steel from the group having a material number and material short name designation 1.4742, 1.4762, 1.4724, 1.4713, 1.4878, 1.4828, 1.4821, 1.4876, 1.4872, 1.4835 or 1.4841.
  2. Cooking appliance component (1) according to the preceding claim, characterised in that the metal substrate (4) has a roughened surface (7, 8).
  3. Cooking appliance component (1) according to the preceding claim, characterised in that the surface (7, 8) of the metal substrate (4) is roughened by means of sandblasting, grinding or brushing.
  4. Cooking appliance component (1) according to the preceding claim, characterised in that the surface (7, 8) of the metal substrate (4) is roughened on both sides.
  5. Cooking appliance component (1) according to any of the preceding claims, characterised in that the surface (7, 8) of the metal substrate (4) has a mean roughness value (Ra) of between approximately 1 µm and 4 µm.
  6. Cooking appliance component (1) according to any of the preceding claims, characterised in that the surface (7, 8) of the metal substrate (4) has a roughness depth (Rz) of between approximately 10 µm and 40 µm.
  7. Cooking appliance component (1) according to any of the preceding claims, characterised in that the metal substrate (4) comprises at least one sandblasted weld seam (9).
  8. Cooking appliance component (1) according to any of the preceding claims, characterised in that the metal substrate (4) is coated with two separately fired enamel layers (15, 25) applied one on top of the other.
  9. Method for producing a cooking appliance component (1), in particular comprising a cooking chamber (2) suitable for carrying out pyrolysis, a component wall (3), which forms the cooking appliance component (1) at least in part, being made of a metal substrate (4) onto which an enamel coating (5) is applied at least in part, characterised in that a heat-resistant and also austenitic or ferritic steel from the group having a material number and material short name designation 1.4742, 1.4762, 1.4724, 1.4713, 1.4878, 1.4828, 1.4821, 1.4876, 1.4872, 1.4835 or 1.4841 is used as the metal substrate (4), and in that at least one surface portion (6) which is kept free of the enamel coating (5) and is therefore electrically conductive, which portion is intended for making electrical contact with the metal substrate (4), remains on the component wall (3), the electrical contact resistance at the electrically conductive surface portion (6) after the enamel coating (5) has been applied to the metal substrate (4) being increased to a maximum of four times, in particular to at most twice or 1.5 times, and in that both the outer surface (7) and the inner surface (8) of the metal substrate (4), apart from the surface portion (6), are substantially completely covered with an enamel layer.
  10. Method according to the preceding claim, characterised in that the metal substrate (4) is roughened before the enamel coating (5) is applied.
  11. Method according to either of the two preceding claims, characterised in that at least two enamel layers (15, 25) are applied, specifically first a base enamel layer (15) and then a covering enamel layer (25).
  12. Method according to the preceding claim, characterised in that the base enamel layer (15) is formed so as to have a significantly lower grain fineness than the covering enamel layer (25).
  13. Method according to either of the two preceding claims, characterised in that a separate enamel slip layer (16, 26), which is fired separately, is first applied for each enamel layer (15, 25).
  14. Method according to any of the three preceding claims, characterised in that the enamel slip layer (16) for the base enamel layer (15) has a lower density than the enamel slip layer (26) for the covering enamel layer (25).
  15. Method according to any of the four preceding claims, characterised in that a ratio of a layer thickness of the covering enamel layer to the layer thickness of the base enamel layer (15) is between 0.75 and 2 and in particular between 1 and 1.5.
EP15190695.5A 2014-11-26 2015-10-21 Cooking device component and method for producing same Active EP3026349B1 (en)

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DE102015110756.2A DE102015110756A1 (en) 2015-07-03 2015-07-03 Cooking appliance component and method for producing a cooking appliance component

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