DE102011051270A1 - Roller used for roller oven, has ceramic roller base component provided with oxidic coating - Google Patents

Roller used for roller oven, has ceramic roller base component provided with oxidic coating Download PDF

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Publication number
DE102011051270A1
DE102011051270A1 DE102011051270A DE102011051270A DE102011051270A1 DE 102011051270 A1 DE102011051270 A1 DE 102011051270A1 DE 102011051270 A DE102011051270 A DE 102011051270A DE 102011051270 A DE102011051270 A DE 102011051270A DE 102011051270 A1 DE102011051270 A1 DE 102011051270A1
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roller
oxide
coating
roll
airfoil
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DE102011051270A
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German (de)
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Bianka Hoffmann
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Benteler Automobiltechnik GmbH
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Benteler Automobiltechnik GmbH
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
    • C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
    • C04B41/5027—Oxide ceramics in general; Specific oxide ceramics not covered by C04B41/5029 - C04B41/5051
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
    • C04B41/81—Coating or impregnation
    • C04B41/85—Coating or impregnation with inorganic materials
    • C04B41/87—Ceramics
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/1204—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material inorganic material, e.g. non-oxide and non-metallic such as sulfides, nitrides based compounds
    • C23C18/1208—Oxides, e.g. ceramics
    • C23C18/1216—Metal oxides
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/125—Process of deposition of the inorganic material
    • C23C18/1258—Spray pyrolysis
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C18/00—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating
    • C23C18/02—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition
    • C23C18/12—Chemical coating by decomposition of either liquid compounds or solutions of the coating forming compounds, without leaving reaction products of surface material in the coating; Contact plating by thermal decomposition characterised by the deposition of inorganic material other than metallic material
    • C23C18/125—Process of deposition of the inorganic material
    • C23C18/1295—Process of deposition of the inorganic material with after-treatment of the deposited inorganic material
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
    • C23C4/10—Oxides, borides, carbides, nitrides or silicides; Mixtures thereof
    • C23C4/11—Oxides
    • 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
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C13/00—Rolls, drums, discs, or the like; Bearings or mountings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
    • F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
    • F27B9/20—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace
    • F27B9/24—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor
    • F27B9/2407—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a substantially straight path tunnel furnace being carried by a conveyor the conveyor being constituted by rollers (roller hearth furnace)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/02—Skids or tracks for heavy objects
    • F27D3/026—Skids or tracks for heavy objects transport or conveyor rolls for furnaces; roller rails
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
    • C04B2111/0087—Uses not provided for elsewhere in C04B2111/00 for metallurgical applications

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Thermal Sciences (AREA)
  • General Chemical & Material Sciences (AREA)
  • Structural Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Coating By Spraying Or Casting (AREA)

Abstract

A roller has a ceramic roller base component provided with oxidic coating. An independent claim is included for preparation of roller.

Description

Die Erfindung betrifft eine Rolle für einen Rollenofen sowie einen Rollenofen und Verfahren zur Herstellung einer Rolle für einen Rollenofen.The invention relates to a roller for a roller kiln and a roller kiln and method for producing a roller for a roller kiln.

Zur Wärmebehandlung von dünnem Gut, wie Stahlblechen, gelangen Rollenöfen zum Einsatz. Diese gehören zur Gruppe der Durchlauföfen. In einem Rollenofen wird das Gut über ortsfeste, rotierende Rollen transportiert, wobei es sich während des Transports auf den Rollen erwärmt. Das Gut läuft hierbei direkt auf den Rollen. Im Rollenofen hat das Gut intensiv Kontakt mit der Ofenatmosphäre. Aus diesem Grund sind die Wärmeübertragungsbedingungen sehr gut für eine schnelle Erwärmung geeignet.For heat treatment of thin material, such as steel sheets, roller furnaces are used. These belong to the group of furnaces. In a roller kiln, the material is transported via stationary, rotating rollers, where it heats up during transport on the rollers. The estate runs here directly on the rolls. In the roller furnace, the material has intensive contact with the furnace atmosphere. For this reason, the heat transfer conditions are very well suited for rapid heating.

In Rollenöfen werden überwiegend keramische Rollen eingesetzt, die bei hohen Temperaturen stabil arbeiten. Als Werkstoff für die Rollen werden häufig Siliziumcarbid (SiC) oder Aluminiumoxid (Al2O3) verwendet. Auch Rollen aus hochlegiertem hitzebeständigem Edelstahl, beispielsweise einem Stahl mit der Werkstoffnummer 1.4841 kommen zum Einsatz. Die Rollen aus den vorgenannten Werkstoffen sind relativ teuer. Die Entscheidung, welcher Werkstoff für die Transportrollen zum Einsatz gelangt, hängt im Wesentlichen von der Einsatztemperatur des Prozesses ab und ist auch durch das Gewicht des zu erwärmenden Gutes bestimmt.Roller furnaces predominantly use ceramic rollers which work stably at high temperatures. Silicon carbide (SiC) or aluminum oxide (Al 2 O 3 ) is often used as the material for the rolls. Rolls of high-alloy heat-resistant stainless steel, for example a steel with the material number 1.4841, are also used. The roles of the aforementioned materials are relatively expensive. The decision as to which material is used for the transport rollers depends essentially on the operating temperature of the process and is also determined by the weight of the material to be heated.

Ein besonderes Problem tritt auf, wenn beschichtete Stahlbleche, insbesondere Stahlbleche mit einer Beschichtung aus AlSi10, in einem Rollenofen erwärmt werden. Die Erwärmung wird zur Vorbereitung einer Warmumformung der Stahlbleche durchgeführt. Hierbei werden die beschichteten Stahlbleche auf Temperaturen von bis zu 950°C erwärmt und anschließend umgeformt. Bei der Erwärmung findet gleichzeitig eine Durchlegierung der Beschichtung mit dem Stahlgrundwerkstoff statt. Beim Transport der beschichteten Stahlbleche durch den Rollenofen gelangen die Tragflächen der Rollen in direkten Kontakt mit dem aufgeschmolzenen Beschichtungsmaterial. Hierbei können sich Ablagerungen bzw. Anhaftungen des Beschichtungswerkstoffs auf den Rollen bilden. In Folge dessen kommt es häufig zu einem erhöhten Verschleiß der Rollen. Diese Verschleißerscheinungen beruhen im Wesentlichen auf einer Diffusion des Beschichtungsmaterials in die Rollen hinein und/oder Teile der Beschichtung reagieren mit dem Grundmaterial der Rollen. Dies kann zu einem Ausfall der Rollen bis hin zu einem Rollenbruch führen.A particular problem arises when coated steel sheets, in particular steel sheets with a coating of AlSi10, are heated in a roller furnace. The heating is carried out in preparation for hot working of the steel sheets. Here, the coated steel sheets are heated to temperatures of up to 950 ° C and then formed. During heating, a simultaneous alloying of the coating with the steel base material takes place. When the coated steel sheets are transported through the roller kiln, the carrying surfaces of the rollers come into direct contact with the molten coating material. In this case, deposits or adhesions of the coating material can form on the rollers. As a result, there is often an increased wear of the rollers. These signs of wear are essentially due to a diffusion of the coating material into the rollers and / or parts of the coating react with the base material of the rollers. This can lead to a failure of the rollers up to a roll break.

Der Erfindung liegt daher die Aufgabe zugrunde, eine anwendungstechnisch verbesserte Rolle für einen Rollenofen zu schaffen, die insbesondere beim Einsatz in einem Rollenofen für die Erwärmung von beschichteten Stahlblechen eine höhere Lebenserwartung hat sowie einen verbesserten Rollenofen für die Erwärmung von beschichteten Stahlblechen bereitzustellen und ein Verfahren zur Herstellung einer solchen Rolle aufzuzeigen.The invention is therefore an object of the invention to provide an improved application role for a roller furnace, which has a higher life expectancy especially when used in a roller furnace for the heating of coated steel sheets and provide an improved roller kiln for the heating of coated steel sheets and a method for Production of such a role show.

Die Lösung dieser Aufgabe besteht nach der Erfindung in einer Rolle mit den Merkmalen von Anspruch 1, einem Rollenofen gemäß Anspruch 8 sowie in einem Verfahren gemäß den Ansprüchen 9 und 10.The solution of this problem consists according to the invention in a roll with the features of claim 1, a roller furnace according to claim 8 and in a method according to claims 9 and 10.

Eine erfindungsgemäße Rolle weist einen keramischen Rollengrundkörper auf. Ein für die Praxis besonders gut geeigneter kermamischer Werkstoff für den Rollengrundkörper ist Mullit. Hierbei handelt es sich um ein Silikat. Selbstverständlich können auch andere keramische Werkstoffe zum Einsatz gelangen, wie Siliziumkarbid oder Aluminiumoxid oder Quarzgut. Die Tragfläche des Rollengrundkörpers ist mit einer oxidischen Tragflächenbeschichtung versehen. Die Tragflächenbeschichtung auf Basis von Oxid verringert die Benetzbarkeit der Rollen gegenüber Metallschmelzen, also insbesondere einem Beschichtungswerkstoff von beschichteten Stahlblechen, wie einer Aluminium-Siliziumlegierung. Der Werkstoff der Tragflächenbeschichtung geht idealerweise keine Reaktion mit dem Beschichtungswerkstoff der Stahlbleche ein und fungiert als dichte Schutzschicht für den keramischen Rollengrundkörper. Insbesondere ist die Oberfläche bzw. die Tragfläche der Rollen durch die Tragflächenbeschichtung sehr glatt und wenig porös. Oberflächenunebenheiten und Porösitäten des Rollengrundkörpers werden durch die Tragflächenbeschichtung ausgefüllt bzw. ausgeglichen.A roller according to the invention has a ceramic roller base body. A particularly suitable for the practice Kermamischer material for the main body roll is mullite. This is a silicate. Of course, other ceramic materials can be used, such as silicon carbide or alumina or fused silica. The support surface of the roller main body is provided with an oxidic wing coating. The oxide based airfoil coating reduces the wettability of the rolls to molten metals, in particular a coating material of coated steel sheets, such as an aluminum-silicon alloy. Ideally, the surface coating material does not react with the coating material of the steel sheets and acts as a dense protective layer for the ceramic roll body. In particular, the surface or the support surface of the rollers is very smooth and not very porous due to the airfoil coating. Surface irregularities and porosities of the roll base are filled by the airfoil coating.

Die erfindungsgemäße Rolle für einen Rollenofen zeichnet sich durch eine hohe Lebensdauer bei geringer Reparaturanfälligkeit aus. Die Transporteigenschaften der erfindungsgemäßen Rollen und eines Rollenofens mit einer Rollenbahn aus solchen Rollen sind verbessert. Zudem wird eine Qualitätssteigerung bzw. -optimierung erreicht, da nachteilige Beeinflussungen der Beschichtung eines Stahlblechs durch die Tragflächen der Rollen verringert werden.The roller according to the invention for a roller kiln is characterized by a long service life with low susceptibility to repair. The transport properties of the rollers according to the invention and of a roller furnace with a roller conveyor of such rollers are improved. In addition, an increase in quality or optimization is achieved because adverse effects on the coating of a steel sheet are reduced by the wings of the rollers.

Vorteilhafte Weiterbildungen und Ausgestaltungen der erfindungsgemäßen Rolle sind Gegenstand der abhängigen Ansprüche 2 bis 7.Advantageous developments and refinements of the roller according to the invention are the subject of the dependent claims 2 to 7.

Besonders bevorzugt enthält die Tragflächenbeschichtung zumindest ein Oxid, ausgewählt aus der Gruppe Aluminiumoxid (Al2O3), Zirkonium(IV)-oxid (ZrO2), Chrom(III)-oxid (Cr2O3), Yttriumoxid (Y2O3), Siliziumdioxid (SiO2), Calziumoxid (CaO), Magnesiumoxid (MgO), Kaliumoxid (K2O), Titan(IV)-oxid (TiO2) und/oder Eisen(II)-oxid (FeO) und zwar in einem Anteil von mindestens 50 Gew.-%. (Gewichtsprozent). Insbesondere liegt der Anteil des Oxids in der Tragflächenbeschichtung zwischen 80 Gew.-% und 95 Gew.-%.Particularly preferably, the airfoil coating contains at least one oxide selected from the group aluminum oxide (Al 2 O 3 ), zirconium (IV) oxide (ZrO 2 ), chromium (III) oxide (Cr 2 O 3 ), yttrium oxide (Y 2 O 3 ), silicon dioxide (SiO 2 ), calcium oxide (CaO), magnesium oxide (MgO), potassium oxide (K 2 O), titanium (IV) oxide (TiO 2 ) and / or iron (II) oxide (FeO) in an amount of at least 50% by weight. (Weight percent). In particular, the proportion of the oxide is in the airfoil coating between 80 wt .-% and 95 wt .-%.

Eine besonders vorteilhafte Ausgestaltung sieht vor, dass die Tragflächenbeschichtung als thermische Spritzschicht ausgeführt ist. Dies ist besonders effizient und gewährleistet eine hochqualitative Tragflächenbeschichtung. Insbesondere ist die Tragflächenbeschichtung durch ein atmosphärisches Gleichstromplasmaspritzen auf den Rollengrundkörper aufgetragen. In diesem Fall kommen hochschmelzende Oxide zur Anwendung, wie z. B. Aluminiumoxid (Al2O3), Zirkonium(IV)-oxid (ZrO2), Chrom(III)-oxid (Cr2O3), Yttriumoxid (Y2O3). Diese werden als Pulver bereitgestellt und mittels eines Plasmastrahls an- bzw. geschmolzen und auf den keramischen Rollengrundkörper aufgespritzt. Hierdurch werden dichte, festhaftende Tragflächenbeschichtungen mit einer Dicke zwischen 10 μm und 1000 μm, vorzugsweise von 200 μm bis 400 μm, insbesondere mit einer Schichtdicke von circa 300 μm erzeugt. Qualitätsmerkmale einer solchen Tragflächenbeschichtung sind geringe Porösität, gute Anbindung an das Material des Rollengrundkörpers sowie Rissfreiheit und homogene Mikrostruktur. Solche Tragflächenbeschichtungen sind kaum bzw. wenig von Aluminium-Silizium-Schmelzen benetzbar und zeigen auch nur eine geringe bzw. kein Reaktionsvermögen mit einer solchen Schmelze. Zum Auftrag der Tragflächenbeschichtung können die Rollen rotierend bewegt werden, wohingegen die Plasmadüse zum Auftrag der Beschichtung mittels einer Linearführung bewegt wird.A particularly advantageous embodiment provides that the wing coating is designed as a thermal spray coating. This is particularly efficient and ensures a high quality airfoil coating. In particular, the airfoil coating is applied to the roller body by atmospheric DC plasma spraying. In this case, high-melting oxides are used, such. Example, alumina (Al 2 O 3 ) , zirconium (IV) oxide (ZrO 2 ), chromium (III) oxide (Cr 2 O 3 ), yttrium oxide (Y 2 O 3 ). These are provided as powder and melted or melted by means of a plasma jet and sprayed onto the ceramic roller body. As a result, dense, firmly adhering airfoil coatings having a thickness between 10 .mu.m and 1000 .mu.m, preferably from 200 .mu.m to 400 .mu.m, in particular with a layer thickness of about 300 microns produced. Quality features of such a wing coating are low porosity, good connection to the material of the roller body as well as crack-free and homogeneous microstructure. Such airfoil coatings are hardly or little wettable by aluminum-silicon melts and also show little or no reactivity with such a melt. For application of the airfoil coating, the rollers can be moved in rotation, whereas the plasma nozzle for application of the coating is moved by means of a linear guide.

Die Tragflächenbeschichtung kann aus einem Oxid oder aus einer Mischung von Oxiden bestehen. Dabei wird die Mischung so eingestellt, dass die angestrebten positiven Effekte hinsichtlich geringer Porösität und Dauerfestigkeit der Tragflächenbeschichtung erzeugt werden. So kann beispielsweise Zirkonium(IV)-oxid (ZrO2) mittels Yttrium stabilisiert werden.The airfoil coating may consist of an oxide or a mixture of oxides. The mixture is adjusted so that the desired positive effects in terms of low porosity and fatigue strength of the wing coating are generated. For example, zirconium (IV) oxide (ZrO 2 ) can be stabilized by yttrium.

Eine alternative vorteilhafte Ausgestaltung sieht vor, dass die Tragflächenbeschichtung aus einer auf den Rollengrundkörper aufgetragenen und anschließend gebrannten Suspension gebildet ist. Bei dieser Auftragstechnologie wird ein pulverförmiges Oxid oder eine pulverförmige Oxidmischung aus z. B. Siliziumdioxid (SiO2), Aluminiumoxid (Al2O3), Calziumoxid (CaO), Magnesiumoxid (MgO), Kaliumoxid (K2O), Titan(IV)-oxid (TiO2) oder Eisen(II)-oxid (FeO) in Wasser suspendiert und auf den keramischen Rollengrundkörper aufgetragen. Dies kann beispielsweise sprühtechnisch oder mittels Streichauftrag sowie durch ein Tauchverfahren erfolgen. Die schlickartige Suspension wird dann auf dem Rollengrundkörper getrocknet und anschließend eingebrannt. Auch diese Tragflächenbeschichtung ist wenig oder kaum von einer Aluminium-Silizium-Schmelze benetzbar. Die aus der Suspension gebildete Tragflächenbeschichtung weist eine Dicke zwischen 10 μm und 1000 μm, vorzugsweise von 200 μm bis 400 μm, insbesondere von circa 300 μm auf.An alternative advantageous embodiment provides that the airfoil coating is formed from a suspension applied to the roller main body and subsequently fired. In this application technology, a powdery oxide or a powdery oxide mixture of z. As silica (SiO 2 ), alumina (Al 2 O 3 ), calcium oxide (CaO), magnesium oxide (MgO), potassium oxide (K 2 O), titanium (IV) oxide (TiO 2 ) or iron (II) oxide (FeO) suspended in water and applied to the ceramic roller body. This can be done for example by spraying or by coating and by a dipping process. The silty suspension is then dried on the roll base and then baked. Also, this wing coating is little or hardly wetted by an aluminum-silicon melt. The airfoil coating formed from the suspension has a thickness between 10 .mu.m and 1000 .mu.m, preferably from 200 .mu.m to 400 .mu.m, in particular of approximately 300 .mu.m.

Nach einer bestimmten Einsatzzeit bzw. nach Auftreten von unvermeidbaren Anhaftungen lassen sich diese gut entfernen. Beim Entfernen kann gleichzeitig die Tragflächenbeschichtung entfernt werden. Der Rollengrundkörper kann anschließend neu beschichtet und wieder eingesetzt werden.After a certain period of use or after the occurrence of unavoidable buildup, these can be easily removed. When removing the wing coating can be removed at the same time. The roll body can then be recoated and reused.

Besonders bevorzugt wird die Suspension gebildet aus einem pulverförmigen Oxid bzw. einer Oxidmischung aus Wasser, wobei das Verhältnis von Oxidpulver zu Wasser zwischen 1:1 und 1:3 betragen kann. Die Korngröße des pulverförmigen Oxids liegt bei kleiner gleich (≤) 250 μm. Die Suspension hat eine flüssig-breiige, schlickerartige Konsistenz.The suspension is particularly preferably formed from a powdery oxide or an oxide mixture of water, it being possible for the ratio of oxide powder to water to be between 1: 1 and 1: 3. The grain size of the powdery oxide is less than or equal to (≤) 250 μm. The suspension has a liquid pulpy, slurry-like consistency.

Der Auftrag der Tragflächenbeschichtung durch die Suspension kann auch mehrlagig und/oder mehrstufig erfolgen. Bei einem mehrstufigen Beschichtungsauftrag erfolgt dies vorzugsweise mit einer Zwischentrocknung zwischen den einzelnen Stufen. Die Trocknung erfolgt üblicherweise zuerst an Luft. Nach dieser An- bzw. Vortrocknung kann die mit der angetrockneten Suspension versehene Rolle in den Rollenofen gebracht werden und wird dort durch die Prozesstemperatur auf den Rollengrundkörper eingebrannt.The order of the wing coating by the suspension can also be multi-layered and / or multi-stage. In a multistage coating application, this is preferably done with an intermediate drying between the individual stages. The drying usually takes place first in air. After this pre- or predrying, the roller provided with the dried suspension can be brought into the roller kiln and is burnt there by the process temperature onto the roller main body.

Bei einer zweilagigen Tragflächenbeschichtung besteht diese aus einer Grundschicht (Grundschlicker) und einer Deckschicht (Deckschlicker). Die Dicke der Grundschicht beträgt bevorzugt zwischen 200 μm bis 300 μm. Die Dicke der Deckschicht beträgt bevorzugt 400 μm bis 600 μm. Die Gesamtdicke der Tragflächenbeschichtung liegt dann bei 600 μm bis 900 μm. Das Mischungsverhältnis von Oxidpulver zu Wasser beträgt beim Grundschlicker 1:1,3, beim Deckschlicker 1:1,1.In the case of a two-layer wing coating, this consists of a base layer (base slip) and a top layer (top slip). The thickness of the base layer is preferably between 200 μm to 300 μm. The thickness of the cover layer is preferably 400 μm to 600 μm. The total thickness of the airfoil coating is then 600 μm to 900 μm. The mixing ratio of oxide powder to water is 1: 1.3 for the base slip and 1: 1.1 for the top slip.

Erfindungsgemäß können günstige keramische Rollengrundkörper eingesetzt werden, die mit einer erfindungsgemäßen Tragflächenbeschichtung versehen werden. Die Tragflächenbeschichtung erhöht die Beständigkeit, sowohl gegenüber den hohen Prozesstemperaturen, insbesondere aber gegenüber nachteiligen Einflüssen aus bzw. von dem zu transportierenden Gut. Insbesondere können die nachteiligen Einflüsse verringert werden, die aus dem Kontakt mit den beschichteten Stahlblechen, bei deren Durchgang durch den Rolleofen stammen. Insgesamt ist zu erwarten, dass die erfindungsgemäßen Rollen eine deutlich größere Lebensdauer besitzen, als unbeschichtete Rollen. Aufgrund der hohen Standzeit der Rollen ergibt sich auch eine höhere Effizienz und Auslastbarkeit eines erfindungsgemäßen Rollenofens.In accordance with the invention, inexpensive ceramic roller base bodies can be used which are provided with an airfoil coating according to the invention. The airfoil coating increases the resistance, both to the high process temperatures, but in particular to adverse effects from or from the goods to be transported. In particular, the adverse effects resulting from contact with the coated steel sheets as they pass through the roll furnace can be reduced. Overall, it can be expected that the rollers according to the invention have a significantly longer service life than uncoated rollers. Due to the long service life of the rollers also results in a higher efficiency and load capacity of a roller furnace according to the invention.

Claims (10)

Rolle für einen Rollenofen, welche einen keramischen Rollengrundkörper aufweist, dadurch gekennzeichnet, dass der Rollengrundkörper mit einer oxidischen Tragflächenbeschichtung versehen ist.Roller for a roller kiln, which has a ceramic roller base body, characterized in that the roller base body is provided with an oxidic wing coating. Rolle nach Anspruch 1, dadurch gekennzeichnet, dass die Tragflächenbeschichtung zumindest ein Oxid, ausgewählt aus der Gruppe Aluminiumoxid (Al2O3), Zirkonium(IV)-oxid (ZrO2), Chrom(III)-oxid (Cr2O3), Yttriumoxid (Y2O3), Siliziumdioxid (SiO2), Calziumoxid (CaO), Magnesiumoxid (MgO), Kaliumoxid (K2O), Titan(IV)-oxid (TiO2) und/oder Eisen(II)-oxid (FeO) in einem Anteil von mindestens 50 Gew.-% enthält.Roller according to claim 1, characterized in that the airfoil coating comprises at least one oxide selected from the group aluminum oxide (Al 2 O 3 ), zirconium (IV) oxide (ZrO 2 ), chromium (III) oxide (Cr 2 O 3 ) , Yttria (Y 2 O 3 ), silicon dioxide (SiO 2 ), calcium oxide (CaO), magnesium oxide (MgO), potassium oxide (K 2 O), titanium (IV) oxide (TiO 2 ) and / or iron (II) - oxide (FeO) in a proportion of at least 50 wt .-%. Rolle nach Anspruch 2, dadurch gekennzeichnet, dass der Anteil des Oxids zwischen 80 Gew.-% und 95 Gew.-% liegt.Roll according to claim 2, characterized in that the proportion of the oxide between 80 wt .-% and 95 wt .-% is. Rolle nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Tragflächenbeschichtung als thermische Spritzschicht ausgeführt ist.Roller according to one of claims 1 to 3, characterized in that the airfoil coating is designed as a thermal spray coating. Rolle nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Tragflächenbeschichtung aus einer auf den Rollengrundkörper aufgetragenen und anschließend eingebrannten Suspension gebildet ist.Roller according to one of claims 1 to 3, characterized in that the airfoil coating is formed from an applied to the roller body and then burned suspension. Rolle nach Anspruch 5, dadurch gekennzeichnet, dass die Suspension auf Basis eines oder mehrerer Oxide in pulverförmiger Form und Wasser gebildet ist.Roller according to claim 5, characterized in that the suspension is formed on the basis of one or more oxides in powder form and water. Rolle nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Tragflächenbeschichtung eine Dicke zwischen 10 μm und 1000 μm, vorzugsweise von 200 μm bis 400 μm, insbesondere ca. 300 μm, besitzt.Roller according to one of claims 1 to 6, characterized in that the airfoil coating has a thickness between 10 .mu.m and 1000 .mu.m, preferably from 200 .mu.m to 400 .mu.m, in particular about 300 .mu.m. Rollenofen mit einer Rolle gemäß einem der Ansprüche 1 bis 7.Roller furnace with a roller according to one of claims 1 to 7. Verfahren zur Herstellung einer Rolle für einen Rollenofen, dadurch gekennzeichnet, dass ein Rollengrundkörper aus einem keramischen Werkstoff bereitgestellt wird und der Rollengrundkörper mit einer durch thermisches Spritzen aufgetragenen Tragflächenbeschichtung versehen wird.A process for producing a roll for a roller kiln, characterized in that a roller body is provided from a ceramic material and the roller body is provided with a applied by thermal spraying airfoil coating. Verfahren zur Herstellung einer Rolle für einen Rollenofen, dadurch gekennzeichnet, dass ein Rollengrundkörper aus einem keramischen Werkstoff bereitgestellt wird und der Rollengrundkörper mit einer Tragflächenbeschichtung versehen wird, wozu eine Suspension aus einem oder mehrerer Oxide und Wasser auf den Rollengrundkörper aufgetragen und gebrannt wird.Method for producing a roll for a roller kiln, characterized in that a roll base body made of a ceramic material is provided and the roll base body is provided with a wing coating, for which a suspension of one or more oxides and water is applied to the roll base body and fired.
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CN111574235A (en) * 2020-04-29 2020-08-25 新沂市正达高新石英材料有限公司 High-temperature-resistant quartz ceramic roller and preparation method thereof
EP4163577A1 (en) 2021-10-08 2023-04-12 Benteler Maschinenbau GmbH Furnace roller, roller hearth furnace, use of the furnace roller and method for manufacturing a thermoformed and at least partially press-hardened vehicle component

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