Claims
- 1. A process for the manufacture of a carbon/ceramic composite material having carbon fibers densified by a ceramic matrix material, said process comprising the steps of:
- providing matrix-free carbon fibers, wherein said matrix-free carbon fibers have previously been heated and cooled;
- heating said matrix-free carbon fibers by subjecting the matrix-free carbon fibers to a thermal treatment in a non-oxidizing environment at a temperature greater than 1300.degree. C. and less than 2200.degree. C. to provide thermally treated matrix-free carbon fibers;
- forming an intermediate coating on said thermally treated matrix-free carbon fibers by chemical vapor infiltration to provide thermally heated coated matrix-free carbon fibers; and
- as the next processing step, densifying the thermally treated coated matrix-free carbon fibers by depositing the ceramic matrix material about and in contact with the thermally treated coated matrix-free carbon fibers to provide thermally treated coated matrixed carbon fibers.
- 2. The process of claim 1, according to which a preform of said matrix-free carbon fibers is formed prior to densification by said matrix material, wherein said thermal treatment is performed on said preform prior to densification by said matrix material.
- 3. The process of claim 1, according to which a preform including said thermally treated coated matrix-free carbon fibers is formed by means of a carbon fiber based material prior to densification by said matrix material, wherein said thermal treatment is performed on said carbon fiber based material constituting said preform, before said preform is formed.
- 4. The process of claim 1, wherein said step of forming an intermediate coating includes depositing pyrolytic carbon on said matrix-free carbon fibers.
Priority Claims (1)
Number |
Date |
Country |
Kind |
90 01563 |
Feb 1990 |
FRX |
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RELATED APPLICATION
This application is a continuation of application Ser. No. 07/652,200, filed Feb. 7, 1991, now abandoned.
US Referenced Citations (4)
Foreign Referenced Citations (5)
Number |
Date |
Country |
0121797 |
Oct 1984 |
EPX |
0172082 |
Feb 1986 |
EPX |
56-63013 |
May 1981 |
JPX |
62-257424 |
Nov 1987 |
JPX |
2081695 |
Feb 1982 |
GBX |
Non-Patent Literature Citations (2)
Entry |
World Patent Index (Latest), accession No. 82-66381E, Derwet Publications Ltd. Londres, B. G. & BG-A-2,092,119 (General Electric Co.) Nov. 8, 1982. |
Journal of Materials Science, "Thermal Diffusivity of Chemically Vapour Deposited Silicon Carbide Reinforced with Silicon of Carbon Fibres", vol. 20, No. 9, Sep. 1985, pp. 3201-3212. |
Continuations (1)
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Number |
Date |
Country |
Parent |
652200 |
Feb 1991 |
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