WO2020173756A1 - Friction brake body for a friction brake of a motor vehicle, friction brake and method for producing a friction brake body - Google Patents

Friction brake body for a friction brake of a motor vehicle, friction brake and method for producing a friction brake body Download PDF

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Publication number
WO2020173756A1
WO2020173756A1 PCT/EP2020/054198 EP2020054198W WO2020173756A1 WO 2020173756 A1 WO2020173756 A1 WO 2020173756A1 EP 2020054198 W EP2020054198 W EP 2020054198W WO 2020173756 A1 WO2020173756 A1 WO 2020173756A1
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WO
WIPO (PCT)
Prior art keywords
friction brake
protection layer
wear protection
brake
friction
Prior art date
Application number
PCT/EP2020/054198
Other languages
German (de)
French (fr)
Inventor
Ilja Potapenko
Christian Schnatterer
Kangjian WU
Simon LOSKYLL
Original Assignee
Robert Bosch Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2020173756A1 publication Critical patent/WO2020173756A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/02—Braking members; Mounting thereof
    • F16D65/12—Discs; Drums for disc brakes
    • F16D65/127—Discs; Drums for disc brakes characterised by properties of the disc surface; Discs lined with friction material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2200/00—Materials; Production methods therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2200/00—Materials; Production methods therefor
    • F16D2200/0004—Materials; Production methods therefor metallic
    • F16D2200/0008—Ferro
    • F16D2200/0013—Cast iron
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2250/00—Manufacturing; Assembly
    • F16D2250/0038—Surface treatment
    • F16D2250/0046—Coating

Definitions

  • the invention relates to a friction brake body for a friction brake of a motor vehicle, in particular a brake disc, the friction brake body having a base body with at least one wear protection layer on a friction contact surface of the base body.
  • the invention also relates to a friction brake for a motor vehicle, with at least one brake disc and with at least one brake pad, and a method for producing the above-mentioned friction brake body.
  • Friction brake bodies for motor vehicles in particular brake disks, are now usually made of gray cast iron. Also today are
  • Friction brake bodies which are provided with a wear protection layer applied to the base body. During a braking process in which a brake pad is pressed against the frictional contact surface of the base body, abrasion occurs on the base body, which is caused by the
  • the friction brake body according to the invention with the features of claim 1 has the advantage that an advantageous wear protection is ensured in a simple and inexpensive manner, which ensures a long service life of the friction brake body.
  • the wear protection layer is mainly made of iron and contains at least two elements selected from the group of chromium, molybdenum, vanadium and aluminum.
  • the iron component thus makes up the largest percentage by weight of the wear protection layer.
  • the iron content makes up at least 80% of the weight of the wear protection layer in particular
  • Wear protection layer there are materials or elements that count among the nitride formers, which are therefore suitable for forming nitrides during a nitriding process in which nitrogen atoms diffuse thermally induced into the material surface. At least two elements from the group of chromium, molybdenum, vanadium and aluminum are provided for this purpose. This material combination of the
  • Wear protection layer results in an advantageous wear protection layer which, in particular in a subsequent nitriding process, becomes a high one
  • the wear protection layer with the base body which is formed in particular from gray cast iron, is diffusion treated.
  • nitrogen atoms diffuse from the nitrogen-containing one
  • the nitrogen-enriched boundary layer can be divided into two areas, an outer area, which is very nitrogen-rich
  • connection layer Forms connecting layer, and an inner area with a very hard diffusion layer in which the precipitated nitrides are present.
  • the outer connection layer achieves a high level of corrosion resistance.
  • the at least two selected elements from the above group preferably make up at least 1% of the weight of the wear protection layer out. This reliably ensures the advantageous wear protection layer, in particular through the subsequent diffusion treatment.
  • carbon and / or manganese are present in the wear protection layer.
  • Other elements can also be contained in the wear protection layer, in which case these are then preferably present in amounts that are typical for contamination.
  • Wear protection layer or the friction brake body after the diffusion process, preferably treated with oxidation, for example, subjected to steam.
  • the friction brake according to the invention with the features of claim 6 is characterized in that the brake disc is designed as a friction brake body according to the invention. This results in the advantages already mentioned above for the brake disk and for the friction brake. In particular, a long service life of the friction brake with low abrasion is guaranteed.
  • the method according to the invention with the features of claim 7 is characterized in that the wear protection layer is made predominantly of iron and contains at least two elements selected from the group of chromium, molybdenum, vanadium and aluminum.
  • the base body which is designed in particular as a gray cast iron body, is used together with the wear protection layer
  • the diffusion treatment in particular ensures that thermally activated nitrogen atoms diffuse into the wear protection layer, in particular into the iron lattice of the wear protection layer, and form nitrides with the nitride-forming elements. Due to the diffusion treatment, a thin and very thin layer is formed on the surface of the base body
  • nitrogen-rich compound layer that acts as corrosion protection.
  • gas nitriding, gas nitrocarburizing, plasma nitriding, plasma nitrocarburizing or salt bath nitrocarburizing is used for diffusion treatment. This makes it an inexpensive one
  • the wear protection layer by thermal spraying or surfacing, particularly preferably
  • Friction brake body which can be carried out inexpensively and ecologically advantageous.
  • the friction brake body according to the invention relates not only to a brake disk but also to the friction brake body in a drum brake.
  • Figure 1 shows an advantageous brake disc in a perspective
  • FIG. 2 is a flow chart to explain an advantageous
  • Figure 1 shows a simplified perspective illustration
  • Brake disk 1 for a friction brake 2 or wheel brake of a motor vehicle not shown here.
  • the brake disc 1 has a base body 3 which is designed in the shape of an annular disc.
  • the base body 3 has an annular frictional contact surface 4 on each of its end faces.
  • An optionally available brake disk chamber is not shown in FIG.
  • At least the friction contact surfaces 4 are each provided with a wear protection layer 5, which ensures less abrasion when interacting with a brake pad of the friction brake 2.
  • the wear protection layer is mainly made of iron and also has at least two nitride-forming elements from the group of chromium, molybdenum, vanadium and aluminum, and is diffusion treated so that in the wear protection layer 5 through the thermally activated diffusion of nitrogen from a nitrogenous environment into the Wear protection layer Nitrides are formed by reaction of the diffusing nitrogen atoms with the nitride-forming elements, which harden the surface and thereby reduce wear.
  • a first step S1 the base body 3 made of gray cast iron is provided, which is already designed in the shape of a disk ring. In particular, they are
  • Friction contact surfaces 4 applied the aforementioned wear protection layer.
  • the wear protection layer 5 by thermal spraying or surfacing is particularly preferred
  • the wear protection layer contains at least 80% by weight iron and at least two of the nitride-forming elements chromium, molybdenum, vanadium and aluminum, as already described above. In addition to carbon and manganese, further elements should preferably be present in the wear protection layer 5, if at all, in amounts typical for impurities.
  • the friction brake body or the brake disk 1 is subjected to the aforementioned diffusion treatment, as a result of which nitrogen atoms diffuse into the wear protection layer and form nitrides.
  • Possible diffusion treatments are gas nitriding, gas nitrocarburizing, plasma nitriding, plasma nitrocarburizing or salt bath nitrocarburizing.
  • the resulting nitrogen-enriched edge layer of the brake disc 1 or wear protection layer 5 can be divided into two sub-layers: an outer, very nitrogen-rich connecting layer and an inner, very hard diffusion layer in which the precipitated nitrides are present.
  • connection layer is achieved, is preferably further increased in a further step S4 by an oxidation treatment, for example by applying steam.
  • a subsequent step S5 the advantageous brake disc 1 is obtained, which ensures a low level of wear or abrasion and also, compared to conventional gray cast iron
  • Brake discs is improved in terms of technological, ecological and aesthetic aspects and also ensures increased resistance to corrosion.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

The invention relates to a friction brake body for a friction brake (2) of a motor vehicle, in particular a brake disc (1), wherein the friction brake body has a base body (3) with at least one wear resistant layer (5) on a friction contact surface (4) of the base body (3). According to the invention, the wear resistant layer (5) is essentially made from iron and at least two elements selected from the group containing chromium, molybdenum, vanadium and aluminium. The invention also relates to a method for producing the friction brake body.

Description

Beschreibung description
Titel title
Reibbremskörper für eine Reibbremse eines Kraftfahrzeugs, Reibbremse und Friction brake body for a friction brake of a motor vehicle, friction brake and
Verfahren zur Herstellung eines Reibbremskörpers Process for the production of a friction brake body
Die Erfindung betrifft einen Reibbremskörper für eine Reibbremse eines Kraftfahrzeugs, insbesondere eine Bremsscheibe, wobei der Reibbremskörper einen Basiskörper mit zumindest einer Verschleißschutzschicht auf einer Reibkontaktoberfläche des Basiskörpers aufweist. The invention relates to a friction brake body for a friction brake of a motor vehicle, in particular a brake disc, the friction brake body having a base body with at least one wear protection layer on a friction contact surface of the base body.
Weiterhin betrifft die Erfindung eine Reibbremse für ein Kraftfahrzeug, mit wenigstens einer Bremsscheibe und mit wenigstens einem Bremsklotz sowie ein Verfahren zur Herstellung des oben genannten Reibbremskörpers. The invention also relates to a friction brake for a motor vehicle, with at least one brake disc and with at least one brake pad, and a method for producing the above-mentioned friction brake body.
Stand der Technik State of the art
Reibbremskörper für Kraftfahrzeuge, insbesondere Bremsscheiben, werden heutzutage in der Regel aus Grauguss gefertigt. Außerdem sind heute Friction brake bodies for motor vehicles, in particular brake disks, are now usually made of gray cast iron. Also today are
Reibbremskörper bekannt, die mit einer auf dem Basiskörper aufgebrachten Verschleißschutzschicht versehen sind. Während eines Bremsvorgangs, bei welchem ein Bremsklotz gegen die Reibkontaktoberfläche des Basiskörpers gepresst wird, entsteht Abrieb an dem Basiskörper, der durch die Friction brake bodies are known which are provided with a wear protection layer applied to the base body. During a braking process in which a brake pad is pressed against the frictional contact surface of the base body, abrasion occurs on the base body, which is caused by the
Verschleißschutzschicht reduziert wird. Dabei ist es bekannt, Wear protection layer is reduced. It is known
Verschleißschutzschichten auf Basis von Hartmetallen oder Karbiden vorzusehen, um den Abrieb zu reduzieren. Außerdem ist es beispielsweise aus der Offenlegungsschrift DE 10 2009 008 114 Al bekannt, eine Bremsscheibe durch einen Nitriervorgang nachzubehandeln, um den Abrieb an der Provide wear protection layers based on hard metals or carbides in order to reduce abrasion. In addition, it is known, for example from laid-open specification DE 10 2009 008 114 A1, to post-treat a brake disc by means of a nitriding process in order to reduce the abrasion on the
Reibkontaktoberfläche zu reduzieren. To reduce frictional contact surface.
Offenbarung der Erfindung Der erfindungsgemäße Reibbremskörper mit den Merkmalen des Anspruchs 1 hat den Vorteil, dass auf einfache und kostengünstige Art und Weise ein vorteilhafter Verschleißschutz gewährleistet ist, der eine hohe Lebensdauer des Reibbremskörpers gewährleistet. Erfindungsgemäß ist hierzu vorgesehen, dass die Verschleißschutzschicht überwiegend aus Eisen gefertigt ist und zumindest zwei Elemente gewählt aus der Gruppe von Chrom, Molybdän, Vanadium und Aluminium enthält. Der Eisenanteil macht somit den größten gewichtsmäßigen Anteil der Verschleißschutzschicht aus. Der Eisenanteil macht insbesondere in der Verschleißschutzschicht zumindest 80 % des Gewichts der Disclosure of the invention The friction brake body according to the invention with the features of claim 1 has the advantage that an advantageous wear protection is ensured in a simple and inexpensive manner, which ensures a long service life of the friction brake body. According to the invention, it is provided for this purpose that the wear protection layer is mainly made of iron and contains at least two elements selected from the group of chromium, molybdenum, vanadium and aluminum. The iron component thus makes up the largest percentage by weight of the wear protection layer. The iron content makes up at least 80% of the weight of the wear protection layer in particular
Verschleißschutzschicht aus. Hinzu kommen Materialien beziehungsweise Elemente, die zu den Nitridbildnern zählen, die also dazu geeignet sind, während eines Nitrierprozesses, bei dem Stickstoffatome thermisch induziert in die Werkstoffoberfläche eindiffundieren, Nitride zu bilden. Vorliegend sind dazu zumindest zwei Elemente aus der Gruppe von Chrom, Molybdän, Vanadium und Aluminium vorgesehen. Durch diesen Materialkombination der Wear protection layer. In addition, there are materials or elements that count among the nitride formers, which are therefore suitable for forming nitrides during a nitriding process in which nitrogen atoms diffuse thermally induced into the material surface. At least two elements from the group of chromium, molybdenum, vanadium and aluminum are provided for this purpose. This material combination of the
Verschleißschutzschicht ergibt sich eine vorteilhafte Verschleißschutzschicht, die insbesondere bei einem nachfolgenden Nitriervorgang zu einer hohen Wear protection layer results in an advantageous wear protection layer which, in particular in a subsequent nitriding process, becomes a high one
Oberflächenhärte durch Nitridbildung führt, durch welche der Verschleiß und insbesondere der Abrieb reduziert werden. Surface hardness leads to nitride formation, through which the wear and especially the abrasion are reduced.
Besonders bevorzugt ist die Verschleißschutzschicht mit dem Basiskörper, der insbesondere aus Grauguss ausgebildet ist, diffusionsbehandelt. Während der Nitrierbehandlung diffundieren Stickstoffatome aus der stickstoffhaltigen Particularly preferably, the wear protection layer with the base body, which is formed in particular from gray cast iron, is diffusion treated. During the nitriding treatment, nitrogen atoms diffuse from the nitrogen-containing one
Umgebung in die Verschleißschutzschicht ein und bilden zusammen mit den nitridbildenden Elementen Nitride, die zu einer wesentlichen Härtesteigerung führen. Die mit Stickstoff angereicherte Randschicht kann in zwei Bereiche eingeteilt werden, ein äußerer Bereich, der eine sehr stickstoffreiche Environment into the wear protection layer and together with the nitride-forming elements form nitrides, which lead to a significant increase in hardness. The nitrogen-enriched boundary layer can be divided into two areas, an outer area, which is very nitrogen-rich
Verbindungsschicht bildet, und einen inneren Bereich mit einer sehr harten Diffusionsschicht, in der die ausgeschiedenen Nitride vorliegen. Durch die äußere Verbindungsschicht wird eine hohe Korrosionsbeständigkeit erzielt. Forms connecting layer, and an inner area with a very hard diffusion layer in which the precipitated nitrides are present. The outer connection layer achieves a high level of corrosion resistance.
Bevorzugt machen die zumindest zwei gewählten Elemente aus der oben genannten Gruppe mindestens 1 % des Gewichts der Verschleißschutzschicht aus. Hierdurch wird die vorteilhafte Verschleißschutzschicht sicher gewährleistet, insbesondere durch die nachfolgende Diffusionsbehandlung. The at least two selected elements from the above group preferably make up at least 1% of the weight of the wear protection layer out. This reliably ensures the advantageous wear protection layer, in particular through the subsequent diffusion treatment.
Weiterhin ist bevorzugt vorgesehen, dass Kohlenstoff und/oder Mangan in der Verschleißschutzschicht vorhanden sind. Auch andere Elemente können zusätzlich in der Verschleißschutzschicht enthalten sein, wobei diese dann bevorzugt in für Verunreinigungen typischen Mengen vorliegen. Furthermore, it is preferably provided that carbon and / or manganese are present in the wear protection layer. Other elements can also be contained in the wear protection layer, in which case these are then preferably present in amounts that are typical for contamination.
Um die Korrosionsbeständigkeit weiter zu erhöhen, ist die To further increase the corrosion resistance, the
Verschleißschutzschicht beziehungsweise der Reibbremskörper nach dem Diffusionsprozess abschließend bevorzugt oxidationsbehandelt, beispielsweise dampfbeaufschlagt. Wear protection layer or the friction brake body, after the diffusion process, preferably treated with oxidation, for example, subjected to steam.
Die erfindungsgemäße Reibbremse mit den Merkmalen des Anspruchs 6 zeichnet sich dadurch aus, dass die Bremsscheibe als erfindungsgemäßer Reibbremskörper ausgebildet ist. Es ergeben sich damit für die Bremsscheibe sowie für die Reibbremse die bereits zuvor genannten Vorteile. Insbesondere wird eine hohe Lebensdauer der Reibbremse mit einem geringen Abrieb gewährleistet. The friction brake according to the invention with the features of claim 6 is characterized in that the brake disc is designed as a friction brake body according to the invention. This results in the advantages already mentioned above for the brake disk and for the friction brake. In particular, a long service life of the friction brake with low abrasion is guaranteed.
Das erfindungsgemäße Verfahren mit den Merkmalen des Anspruchs 7 zeichnet sich dadurch aus, dass die Verschleißschutzschicht überwiegend aus Eisen gefertigt wird und zumindest zwei Elemente gewählt aus der Gruppe von Chrom, Molybdän, Vanadium und Aluminium enthält. Es ergeben sich die zuvor bereits genannten Vorteile. The method according to the invention with the features of claim 7 is characterized in that the wear protection layer is made predominantly of iron and contains at least two elements selected from the group of chromium, molybdenum, vanadium and aluminum. The advantages already mentioned above result.
Insbesondere wird der Basiskörper, der insbesondere als Graugusskörper ausgebildet wird, zusammen mit der Verschleißschutzschicht In particular, the base body, which is designed in particular as a gray cast iron body, is used together with the wear protection layer
diffusionsbehandelt. Durch die Diffusionsbehandlung wird insbesondere erreicht, dass Stickstoffatome thermisch aktiviert in die Verschleißschutzschicht, insbesondere in das Eisengitter der Verschleißschutzschicht eindiffundieren und mit den nitridbildenden Elementen Nitride bilden. Durch die Diffusionsbehandlung bildet sich an der Oberfläche des Basiskörpers eine dünne und sehr diffusion treated. The diffusion treatment in particular ensures that thermally activated nitrogen atoms diffuse into the wear protection layer, in particular into the iron lattice of the wear protection layer, and form nitrides with the nitride-forming elements. Due to the diffusion treatment, a thin and very thin layer is formed on the surface of the base body
stickstoffreiche Verbindungsschicht (Nitridschicht), die als Korrosionsschutz fungiert. Insbesondere wird zur Diffusionsbehandlung Gas-Nitrieren, Gas- Nitrocarburieren, Plasma-Nitrieren, Plasma-Nitrocarburieren oder Salzbad- Nitrocarburieren angewendet. Dadurch ist eine kostengünstige nitrogen-rich compound layer (nitride layer) that acts as corrosion protection. In particular, gas nitriding, gas nitrocarburizing, plasma nitriding, plasma nitrocarburizing or salt bath nitrocarburizing is used for diffusion treatment. This makes it an inexpensive one
Diffusionsbehandlung vorgesehen, durch welche das gewünschte Ergebnis gewährleistet wird. Diffusion treatment provided, through which the desired result is guaranteed.
Weiterhin ist bevorzugt vorgesehen, dass die Verschleißschutzschicht durch thermisches Spritzen oder Auftragsschweißen, besonders bevorzugt Furthermore, it is preferably provided that the wear protection layer by thermal spraying or surfacing, particularly preferably
Laserauftragsschweißen, auf den Basiskörper aufgebracht beziehungsweise appliziert wird. Hierdurch ergibt sich eine einfache Herstellung des Laser deposition welding, applied or applied to the base body. This results in a simple production of the
Reibbremskörpers, die kostengünstig und ökologisch vorteilhaft durchführbar ist. Friction brake body, which can be carried out inexpensively and ecologically advantageous.
Obwohl in der vorliegenden Beschreibung die Erfindung anhand einer Although in the present description the invention based on a
Bremsscheibe beschrieben wird, soll hier deutlich darauf hingewiesen werden, dass der erfindungsgemäße Reibbremskörper neben einer Bremsscheibe auch den Reibbremskörper bei einer Trommelbremse betrifft. Brake disk is described, it should be clearly pointed out here that the friction brake body according to the invention relates not only to a brake disk but also to the friction brake body in a drum brake.
Weitere Vorteile und bevorzugte Merkmale und Merkmalskombinationen ergeben sich insbesondere aus dem zuvor Beschriebenen sowie aus den Ansprüchen. Im Folgenden soll die Erfindung anhand der Zeichnung näher erläutert werden.Further advantages and preferred features and combinations of features emerge in particular from what has been described above and from the claims. The invention will be explained in more detail below with reference to the drawing.
Dazu zeigen To show
Figur 1 eine vorteilhafte Bremsscheibe in einer perspektivischen Figure 1 shows an advantageous brake disc in a perspective
Darstellung, und Representation, and
Figur 2 ein Flussdiagramm zur Erläuterung eines vorteilhaften Figure 2 is a flow chart to explain an advantageous
Verfahrens zur Herstellung der Bremsscheibe. Method of manufacturing the brake disc.
Figur 1 zeigt in einer vereinfachten perspektivischen Darstellung eine Figure 1 shows a simplified perspective illustration
Bremsscheibe 1 für eine hier nicht näher dargestellte Reibbremse 2 oder Radbremse eines Kraftfahrzeugs. Die Bremsscheibe 1 weist einen Basiskörper 3 auf, der ringscheibenförmig ausgebildet ist. Auf seinen Stirnseiten weist der Basiskörper 3 jeweils eine ringförmige Reibkontaktoberfläche 4 auf. Ein optional vorhandener Bremsscheibentopf ist in Figur 1 nicht gezeigt. Zumindest die Reibkontaktoberflächen 4 sind jeweils mit einer Verschleißschutzschicht 5 versehen, welche einen geringeren Abrieb beim Zusammenwirken mit einem Bremsklotz der Reibbremse 2 gewährleistet. Die Verschleißschutzschicht ist dabei überwiegend aus Eisen gefertigt und weist außerdem zumindest zwei nitridbildende Elemente aus der Gruppe von Chrom, Molybdän, Vanadium und Aluminium auf, und ist diffusionsbehandelt, sodass in der Verschleißschutzschicht 5 durch die thermisch aktivierte Diffusion von Stickstoff aus einer stickstoffhaltigen Umgebung in die Verschleißschutzschicht Nitride durch Reaktion der eindiffundierenden Stickstoffatome mit den nitridbildenden Elementen gebildet sind, welcher die Oberfläche erhärten und dadurch den Abrieb reduzieren. Brake disk 1 for a friction brake 2 or wheel brake of a motor vehicle, not shown here. The brake disc 1 has a base body 3 which is designed in the shape of an annular disc. The base body 3 has an annular frictional contact surface 4 on each of its end faces. An optionally available brake disk chamber is not shown in FIG. At least the friction contact surfaces 4 are each provided with a wear protection layer 5, which ensures less abrasion when interacting with a brake pad of the friction brake 2. The wear protection layer is mainly made of iron and also has at least two nitride-forming elements from the group of chromium, molybdenum, vanadium and aluminum, and is diffusion treated so that in the wear protection layer 5 through the thermally activated diffusion of nitrogen from a nitrogenous environment into the Wear protection layer Nitrides are formed by reaction of the diffusing nitrogen atoms with the nitride-forming elements, which harden the surface and thereby reduce wear.
Anhand des in Figur 2 gezeigten Flussdiagramms soll im Folgenden ein vorteilhaftes Verfahren zum Herstellen der Bremsscheibe 1 erläutert werden. In einem ersten Schritt S1 wird der Basiskörper 3 aus Grauguss bereitgestellt, der bereits scheibenringförmig ausgebildet ist. Insbesondere sind die An advantageous method for producing the brake disk 1 is to be explained below with the aid of the flow chart shown in FIG. In a first step S1, the base body 3 made of gray cast iron is provided, which is already designed in the shape of a disk ring. In particular, they are
Reibkontaktoberflächen 4 bereits mechanisch vorbearbeitet, beispielsweise durch Schleifen. In einem darauffolgenden Schritt S2 wird auf die Friction contact surfaces 4 already mechanically pre-machined, for example by grinding. In a subsequent step S2, the
Reibkontaktoberflächen 4 die zuvor genannte Verschleißschutzschicht aufgebracht. Insbesondere wird die Verschleißschutzschicht 5 durch thermisches Spritzen oder Auftragsschweißen, besonders bevorzugt Friction contact surfaces 4 applied the aforementioned wear protection layer. In particular, the wear protection layer 5 by thermal spraying or surfacing is particularly preferred
Laserauftragsschweißen, appliziert. Dabei enthält die Verschleißschutzschicht zumindest 80 % Gewichtsanteil Eisen und zumindest zwei der nitridbildenden Elemente Chrom, Molybdän, Vanadium und Aluminium, wie zuvor bereits beschrieben. Außer Kohlenstoff und Mangan sollen weitere Elemente in der Verschleißschutzschicht 5 bevorzugt allenfalls in für Verunreinigungen typischen Gehalten vorliegen. Laser deposition welding, applied. The wear protection layer contains at least 80% by weight iron and at least two of the nitride-forming elements chromium, molybdenum, vanadium and aluminum, as already described above. In addition to carbon and manganese, further elements should preferably be present in the wear protection layer 5, if at all, in amounts typical for impurities.
In einem darauffolgenden Schritt S3 wird der Reibbremskörper beziehungsweise die Bremsscheibe 1 der genannten Diffusionsbehandlung unterzogen, wodurch Stickstoffatome in die Verschleißschutzschicht eindiffundieren und Nitride bilden. Mögliche Diffusionsbehandlungen sind Gas-Nitrieren, Gas-Nitrocarburieren, Plasma-Nitrieren, Plasma-Nitrocarburieren oder Salzbad-Nitrocarburieren. Die dadurch entstandene mit Stickstoff angereicherte Randschicht der Bremsscheibe 1 beziehungsweise Verschleißschutzschicht 5 lässt sich in zwei Teilschichten einteilen: eine äußere, sehr stickstoffreiche Verbindungsschicht und eine innere, sehr harte Diffusionsschicht, in der die ausgeschiedenen Nitride vorliegen. Die Korrosionsbeständigkeit der Bremsscheibe 1, die im Wesentlichen durch dieIn a subsequent step S3, the friction brake body or the brake disk 1 is subjected to the aforementioned diffusion treatment, as a result of which nitrogen atoms diffuse into the wear protection layer and form nitrides. Possible diffusion treatments are gas nitriding, gas nitrocarburizing, plasma nitriding, plasma nitrocarburizing or salt bath nitrocarburizing. The resulting nitrogen-enriched edge layer of the brake disc 1 or wear protection layer 5 can be divided into two sub-layers: an outer, very nitrogen-rich connecting layer and an inner, very hard diffusion layer in which the precipitated nitrides are present. The corrosion resistance of the brake disc 1, which is essentially due to the
Verbindungsschicht erzielt wird, wird bevorzugt in einem weiteren Schritt S4 durch eine Oxidationsbehandlung, beispielsweise durch Dampfbeaufschlagung, weiter erhöht. In einem darauf abschließenden Schritt S5 wird die vorteilhafte Bremsscheibe 1 erhalten, die einen geringen Verschleiß beziehungsweise Abrieb gewährleistet und außerdem im Vergleich zu konventionellen Grauguss-Connection layer is achieved, is preferably further increased in a further step S4 by an oxidation treatment, for example by applying steam. In a subsequent step S5, the advantageous brake disc 1 is obtained, which ensures a low level of wear or abrasion and also, compared to conventional gray cast iron
Bremsscheiben hinsichtlich technologischen, ökologischen und ästhetischen Aspekten verbessert ist und außerdem eine erhöhte Beständigkeit gegenüber Korrosion gewährleistet. Brake discs is improved in terms of technological, ecological and aesthetic aspects and also ensures increased resistance to corrosion.

Claims

Ansprüche Expectations
1. Reibbremskörper für eine Reibbremse (2) eines Kraftfahrzeugs, insbesondere eine Bremsscheibe (1), wobei der Reibbremskörper einen 1. Friction brake body for a friction brake (2) of a motor vehicle, in particular a brake disc (1), the friction brake body having a
Basiskörper (3) mit zumindest einer Verschleißschutzschicht (5) auf einer Reibkontaktoberfläche (4) des Basiskörpers (3) aufweist, dadurch Base body (3) with at least one wear protection layer (5) on a frictional contact surface (4) of the base body (3), thereby
gekennzeichnet, dass die Verschleißschutzschicht (5) überwiegend aus Eisen gefertigt ist und zumindest zwei Elemente gewählt aus der Gruppe von Chrom, Molybdän, Vanadium und Aluminium enthält. characterized in that the wear protection layer (5) is mainly made of iron and contains at least two elements selected from the group of chromium, molybdenum, vanadium and aluminum.
2. Reibbremskörper nach Anspruch 1, dadurch gekennzeichnet, dass die Verschleißschutzschicht (5) mit dem Basiskörper (3), insbesondere 2. Friction brake body according to claim 1, characterized in that the wear protection layer (5) with the base body (3), in particular
Graugusskörper, in einer Stickstoffatmosphäre diffusionsbehandelt ist. Gray cast iron body, is diffusion treated in a nitrogen atmosphere.
3. Reibbremskörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die zumindest zwei gewählten Elemente mindestens 1 % des Gewichts der Verschleißschutzschicht (5) ausmachen. 3. Friction brake body according to one of the preceding claims, characterized in that the at least two selected elements make up at least 1% of the weight of the wear protection layer (5).
4. Reibbremskörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass Kohlenstoff und/oder Mangan in der 4. Friction brake body according to one of the preceding claims, characterized in that carbon and / or manganese in the
Verschleißschutzschicht (5) vorhanden sind. Wear protection layer (5) are present.
5. Reibbremskörper nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verschleißschutzschicht (5) oxidationsbehandelt ist. 5. Friction brake body according to one of the preceding claims, characterized in that the wear protection layer (5) is treated for oxidation.
6. Reibbremse (2) für ein Kraftfahrzeug, mit wenigstens einer 6. Friction brake (2) for a motor vehicle, with at least one
Bremsscheibe (1) und mit wenigstens einem der Bremsscheibe (1) zugeordnete Bremsklotz, gekennzeichnet durch die Ausbildung der Bremsscheibe (1) als Reibbremskörper nach einem oder mehreren der Ansprüche 1 bis 5. Brake disk (1) and with at least one brake pad assigned to the brake disk (1), characterized by the design of the brake disk (1) as a friction brake body according to one or more of Claims 1 to 5.
7. Verfahren zur Herstellung eines Reibbremskörpers für eine Reibbremse (2) eines Kraftfahrzeugs, insbesondere Bremsscheibe (1), wobei der 7. A method for producing a friction brake body for a friction brake (2) of a motor vehicle, in particular a brake disc (1), wherein the
Reibbremskörper einen Basiskörper (3) mit zumindest einer Friction brake body a base body (3) with at least one
Reibkontaktoberfläche (4) aufweist, wobei zumindest auf die Has frictional contact surface (4), at least on the
Reibkontaktoberfläche (4) eine Verschleißschutzschicht (5) aufgebracht wird, dadurch gekennzeichnet, dass die Verschleißschutzschicht (5) überwiegend aus Eisen gefertigt wird und zumindest zwei Elemente gewählt aus der Gruppe von Chrom, Molybdän, Vanadium und Aluminium enthält. A wear protection layer (5) is applied to the friction contact surface (4), characterized in that the wear protection layer (5) is mainly made of iron and contains at least two elements selected from the group of chromium, molybdenum, vanadium and aluminum.
8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass die8. The method according to claim 7, characterized in that the
Verschleißschutzschicht (5) mit dem Basiskörper (3), insbesondere Wear protection layer (5) with the base body (3), in particular
Graugusskörper, in stickstoffhaltiger Atmosphäre diffusionsbehandelt wird. Gray cast iron body, is diffusion treated in a nitrogenous atmosphere.
9. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass als Diffusionsbehandlung Gas-Nitrieren, Gas-9. The method according to any one of the preceding claims, characterized in that the diffusion treatment gas nitriding, gas
Nitrocarburieren, Plasma-Nitrieren, Plasma-Nitrocarburieren oder Salzbad- Nitrocarburieren angewendet wird. Nitrocarburizing, plasma nitriding, plasma nitrocarburizing or salt bath nitrocarburizing is used.
10. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Verschleißschutzschicht (5) durch thermisches Spritzen oder Auftragsschweißen, bevorzugt Laserauftragsschweißen, auf den Basiskörper (3) aufgebracht wird. 10. The method according to any one of the preceding claims, characterized in that the wear protection layer (5) is applied to the base body (3) by thermal spraying or build-up welding, preferably laser build-up welding.
PCT/EP2020/054198 2019-02-25 2020-02-18 Friction brake body for a friction brake of a motor vehicle, friction brake and method for producing a friction brake body WO2020173756A1 (en)

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DE102021130045A1 (en) 2021-11-17 2023-05-17 Johann Fimbinger Friction brake, in particular for motor vehicles
WO2023088599A1 (en) 2021-11-17 2023-05-25 Johann Fimbinger Friction brake, especially for motor vehicles

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