Ceramic materials for friction linings
AssigneeSgl Carbon SE
InventorsRonald Huener, Moritz Bauer, Peter Winkelmann
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Abstract
Ceramic friction linings comprising a material consisting essentially of metal oxides which are present in the form of a sintered ceramic or in the form of ceramic particles bound by carbon and/or carbides, processes for producing them and their use in combination with ceramic friction bodies, in particular for high-performance brakes
Claims37
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The process of claim 25 wherein the metal oxides are selected from among oxides of at least one of the metals of the group consisting of oxides of Ti, Zr, Al, B, Si, Ca and Mg.
The process of claim 25 wherein the crystal structure of the metal oxides is a layer lattice.
The process of claim 25 wherein the metal oxides are selected from the group consisting of magnesium aluminosilicates, talc and magnesium oxide.
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The process of claim 25 wherein the additives are selected from the group consisting of inorganic binders, friction promoters and lubricants, with the sum of the mass fractions of the additives in the materials being below 50%.
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A process for producing a ceramic friction lining comprising a material consisting essentially of metal oxides which are present in the form of ceramic particles bound by carbon and/or carbides, wherein the material has a mass fraction of at least 50% of metal oxides, wherein the cohesion of the material is effected by bonding with an inorganic material selected from the group consisting of carbon, which carbon is formed by carbonisation treatment of a green body at temperatures above 650° C., and carbides which carbides are formed by thermal treatment at temperatures of at least 1200° C., wherein
- a shapable mixture of pulverulent metal oxides, additives and thermally curing organic binders is produced in a first step,
- the mixture is brought into the desired shape by pressing in a second step and
- the shaped mixture is cured with the aid of the thermally curing organic binders in a third step, and
- the green body produced in this way is carbonized in a fourth step at temperatures above 650° C. and in the absence of atmospheric oxygen, wherein carbon is formed during the carbonisation.
A process for producing a friction lining, wherein
- a shapable mixture of pulverulent metal oxides, additives and, if desired, organic plasticizers is produced in a first step,
- the mixture is brought into the desired shape by pressing in a second step and
- the shaped mixture is sintered in a third step at temperatures of from about 1000° C. to about 1500°C.
A process for producing a ceramic brake lining comprising a material consisting essentially of metal oxides which are present in the form of ceramic particles bound by carbon and/or carbides, wherein the material has a mass fraction of at least 50% of metal oxides, wherein the cohesion of the material is effected by bonding with an inorganic material selected from the group consisting of carbon, which carbon is formed by carbonisation treatment of a green body at temperatures above 650° C., and carbides which carbides are formed by thermal treatment at temperatures of at least 1200° C. wherein
- a shapable mixture of pulverulent metal oxides, additives and thermally curing organic binders is produced in a first step,
- the mixture is brought into the desired shape by pressing in a second step and
- the shaped mixture is cured with the aid of the thermally curing organic binders in a third step, and
- the green body produced in this way is carbonised in a fourth step at temperatures above 650° C. and in the absence of atmospheric oxygen, wherein carbon is formed during the carbonisation.
Dependencies are inferred from the claim text.