C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
261/6, 49/77
C04B 14/38 (2006.01) C03C 10/00 (2006.01) C03C 14/00 (2006.01)
Patent
CA 1198744
Abstract Reaction Inhibited-Silicon Carbide Fiber Reinforced High Temperature Glass-Ceramic Composites And Compositions Therefor 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°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 Li2O in the matrix with MgO results in an even higher temperature stable composite, e.g., up to about 1200°C. Another aspect of the instant invention is directed to the preparation of glass-ceramic bodies exhibiting high strengths and use temperatures up to 1200°C. The bodies consist essentially, expressed in terms of weight percent on the oxide basis, of Li2O 1.5 - 5 Al2O3 15 - 25 SiO2 60 - 75 ZrO2 1 - 5 Nb2O5 0 - 10 Ta2O5 0 - 10 Nb2O5 + Ta2O5 1 - 10 MgO 0 - 1 0 Where excellent resistance to oxidation up to temperatures of 1200°C is desired, 0.5-3% As2O3 will be included in the composition.
428316
Brennan John J.
Chyung Kenneth
Taylor Mark P.
Corning Glass Works
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
United Technologies Corporation
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