Fiber-reinforced silicon nitride composite ceramics

Details Fiber-reinforced silicon nitride composite ceramics Fiber-reinforced silicon nitride composite ceramics

C - Chemistry, Metallurgy

04

B

25/133

C04B 35/80 (2006.01) C04B 35/58 (2006.01)

Patent

CA 1302060

ABSTRACT OF THE DISCLOSURE Tough composites of polymer derived silicon car- bide fibers in silicon nitride matrices, especially re- action bonded silicon nitride matrices, can be made by precoating the fibers with pyrolytic carbon and con- trolling the nitridation or other process which forms the silicon nitride matrix so that a thickness of at least 5 nanometers of carbon remains in the composite after it is formed. Failure of such composites is non- catastrophic. Alternatively, with at least some spe- cific types of polymer derived silicon carbide fibers, composites with non-catastrophic failure can he made by controlling the nitriding conditions to produce an es- sentially void space around the fibers in the final composites. As still another alternative, the space around the fibers may be partially filled with silicon nitride whiskers generated during the nitridation pro- cess.

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