Fiber-reinforced silicon nitride composite ceramics

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

1986-11-26

1989-12-05

Cannon, James C.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including grain, strips, or filamentary elements in...

264 60, 428114, 428212, 428294, 428302, 4283126, 4283179, 428332, 428336, 501 92, 501 95, 501 97, C04B 3556, C04B 3558, C04B 3580, B32B 900

Patent

active

048851990

ABSTRACT:
Tough composites of polymer derived silicon carbide fibers in silicon nitride matrices, especially reaction bonded silicon nitride matrices, can be made by precoating the fibers with pyrolytic carbon and controlling 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 specific types of polymer derived silicon carbide fibers, composites with non-catastrophic failure can be made by controlling the nitriding conditions to produce an essentially 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 process.

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