Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1997-01-27
1998-06-02
Group, Karl
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 973, 501 974, C04B 35577, C04B 35596
Patent
active
057599335
ABSTRACT:
A silicon nitride sintered body has a composition consisting essentially of 80 to 93% by weight .beta. silicon nitride, 7 to 20% by weight grain boundary phases consisting essentially of (i) at least two rare earth elements, wherein yttrium is considered a rare earth, and strontium which, calculated as SrO, is 0.5 to 5% by weight, and (ii) at least two of Si, N, O and C; and (c) silicon carbide particulate present in the amount of about 5 to 35 parts by weight per 100 parts by weight of components (a) and (b), said SiC being substantially homogeneously dispersed within said sintered body. Such a ceramic has high strength and long term durability, and is especially suited for industrial applications such as components for gas turbine and automotive engines.
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Goldacker Jeffrey A.
Li Chien-Wei
Pollinger John
Yamanis Jean
Allied-Signal Inc.
Buff Ernest D.
Group Karl
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