Reaction inhibited-silicon carbide fiber reinforced high tempera

Details Reaction inhibited-silicon carbide fiber reinforced high tempera Reaction inhibited-silicon carbide fiber reinforced high tempera

1982-05-20

1984-11-27

Bell, Mark

Compositions: ceramic

Ceramic compositions

Glass compositions, compositions containing glass other than...

428698, 428902, 501 88, 501 89, 501 95, C03C 322, C04B 3556, B32B 502

Patent

active

044851790

ABSTRACT:
A silicon carbide fiber reinforced glass-ceramic matrix composite is disclosed having high strength, fracture toughness, and improved oxidative stability even at high temperature use, e.g., in excess of 1000.degree. C. The composite is made up of a plurality of glass-ceramic layers, each layer reinforced with a plurality of unidirectional continuous length silicon carbide or discontinuous SiC fibers. The composite is formed by starting with the matrix material (preferably lithium aluminosilicate) in the glassy state and converting it from the glassy state to the crystalline state after densification of the composite. Ta or Nb compounds are added to the matrix composition prior to consolidation to form a reaction or diffusion barrier around the SiC fiber, resulting in composites with high temperature oxidation stability. Substitution of at least part of the Li.sub.2 O in the matrix with MgO results in an even higher temperature stable composite, e.g., up to about 1200.degree. C.

REFERENCES:
patent: 3537868 (1970-11-01), Kosaka
patent: 3977886 (1976-08-01), Muller
patent: 4314852 (1982-02-01), Brennan et al.
patent: 4324843 (1982-04-01), Brennan et al.

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