Process for improving the oxidative stability of a composite mat

Details Process for improving the oxidative stability of a composite mat Process for improving the oxidative stability of a composite mat

1994-07-11

1997-12-09

Weisberger, Richard

Coating processes

Direct application of electrical, magnetic, wave, or...

Plasma

427215, 427217, 4272481, 427250, 427562, 427569, 427577, 501 95, 501 96, C23C 1600, B32B 1800, C04B 3556, C04B 3558

Patent

active

056958307

ABSTRACT:
A reinforcing fiber of the non-oxide ceramic type or of carbon to be used in the manufacture of a composite material with a glass, glass-ceramic or ceramic matrix, which composite exhibits good oxidative stability, is treated using a process comprising the steps consisting of: if necessary, oxidizing the fiber superficially or depositing thereon a layer of the same composition but including oxygen; placing the fiber in a chemical vapor deposition vessel; carrying out a pre-treatment at a temperature of 850.degree. to 1250.degree. C., in the presence of hydrogen, at a pressure of 50 to 300 mbar; injecting a mixture of neutral carrier gas and ammonia; stopping the injection and adjusting the pressure to a value of 1 to 10 mbar; injecting AlCl.sub.3 in a neutral diluting gas; producing on the fiber a deposit of AlN by simultaneously injecting a mixture of AlCl.sub.3 and a neutral carrier gas, and a mixture of NH.sub.3 and a neutral carrier gas, until the desired thickness of AlN is obtained; after stopping injection, cooling with a stream of neutral gas; and recovering the fiber.

REFERENCES:
patent: 5484655 (1996-01-01), Lau et al.
Chemical Abstracts, vol. 117, No. 4, Jul. 27, 1992, Columbus, Ohio, U.S. Schachner et al, "CVD of Aluminum Nitride on Whisker Substrates"; p. 372.

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