Brake disk with intermediate layer
AssigneeAudi AG
InventorsAndreas Kienzle, Ingrid Kratschmer
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Abstract
Carbon-ceramic brake disks that comprise several layers, whereby at least one layer is used as a bearing element and at least one layer acts as a friction layer, whereby the bearing element and at least one friction layer are separated by an intermediate layer, characterized in that the intermediate layer has reinforcement fibers in the form of fiber bundles, whereby the fiber bundles are encased by a layer that consists of a mixture of silicon carbide, silicon and carbon, which can be obtained by heat treatment of a mixture that consists of silicon powder and a carbonized resin or carbonized pitch at a temperature of 900° C. up to 1700° C. in an environment devoid of oxidizing agents. A process for their manufacture and use, in particular in automotive brake systems.
Claims5
A process for the production of carbon-ceramic brake disks the method comprising:
- pouring into a compression mold in succession:
- a first molding compound comprising a first carbonizable organic binder as a precursor to a first friction layer,
- a second molding compound comprising a second carbonizable organic binder as a precursor to a first intermediate layer,
- a third molding compound comprising a third carbonizable organic binder as a precursor to a bearing element,
- a fourth molding compound comprising a fourth carbonizable organic binder as a precursor to a second intermediate layer, and
- a fifth molding compound comprising a fifth carbonizable organic binder as a precursor to a second friction layer;
- hardening the layers in a press to form a mother substance;
- carbonizing the mother substance at a temperature of 750 degrees Celsius to 1300 degrees Celsius in an environment devoid of oxidizing agents carbonized, wherein each of the first, second, third, fourth, and fifth carbonizable organic binders are converted essentially to carbon;
- and
- reacting at least a portion of the carbon in the carbonized mother substance with one or more carbide-forming elements to form one or more carbides,
- at a temperature in a range of at least 10 K to 400 k above the melting point of the one or more carbide-forming elements.
Dependencies are inferred from the claim text.