Process for producing shaped bodies of carbon fiber reinforced carbon and shaped body produced by the process
AssigneeSgl Carbon SE
InventorsAndreas Kienzle, Ingrid Kratschmer
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Abstract
A process is provided for producing shaped bodies including carbon fiber reinforced carbon in which the fibers are present in the form of bundles having a defined length, width and thickness. The defined configuration of the fibers in the bundles allows a targeted configuration of the reinforcing fibers in the carbon matrix and thus a structure of the reinforcement which matches the stress of shaped bodies including carbon fiber reinforced carbon, for example brake disks. A shaped body produced according to the invention is also provided.
Claims21
A process for producing shaped bodies having a carbon matrix reinforced with carbon fiber bundles, the process comprising the following steps:
- producing or providing bundles of parallel carbon fibers held together by a dimensionally stable cured, carbonizable binder, with the bundles having a specifically set, defined uniform length, width and thickness;
- producing a molding composition by mixing the fiber bundles, a carbonizable matrix former and optional auxiliaries;
- producing a green body being close to a final shape by pressing the molding composition in a mold being close to the final shape at elevated temperature with curing of the carbonizable matrix former, and subsequent demolding;
- carbonizing the green body to form a carbonized shaped body;
- mechanically re-working the carbonized shaped body, if necessary;
- and
- densifying the carbonized shaped body by deposition of a carbon matrix in a chemical vapor infiltration (CVI) process.
A shaped body, comprising:
- carbon reinforced with carbon fiber bundles and a carbon matrix including a pyrolysis residue of a carbonizable matrix former and carbon deposited by chemical vapor infiltration (CVI);
- said carbon fiber bundles having specifically set, defined uniform dimensions, with a thickness of said bundles being set to a value in a range of from 0.15 to 0.4 mm, a length of said bundles being set to a value in a range of from 6 to 15 mm, and a width of said bundles being set to a value in a range of from 0.5 to 3.5 mm, and said carbon fiber bundles having carbon fibers aligned parallel to one another.
Dependencies are inferred from the claim text.