Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1994-07-18
1996-06-04
Robinson, Ellis P.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 96, 501 97, 501 98, 501127, 501128, 428698, C04B 35567
Patent
active
055232671
ABSTRACT:
A silicon nitride-silicon carbide composite sintered material which comprises 100 parts by weight of a silicon nitride component containing 92 to 99.5 mol % of silicon nitride including excessive oxygen and 0.5 to 8 mol % of the elements of Group IIIa in the Periodic Table as corresponding oxides thereof and 1 to 100 parts by weight of a silicon carbide component in a dispersed state, wherein the silicon nitride component has an average particle size of 1 .mu.m or less and an average aspect ratio of 2 to 10, and the silicon carbide component has an average particle size of 1 .mu.m or less, moreover, the total amount of Al, Mg, Ca respectively contained in the sintered material as calculated as oxides thereof is 0.5% by weight or less, and a manufacturing method thereof.
According to the above-mentioned composite sintered material, it becomes possible to suppress deterioration of strength at 1400.degree. C. and realize excellent creep properties. Therefore, the composite sintered material is applicable not only to structural materials for heat engines such as gas turbines and turbo-rotors but also to other heat resistant materials for various uses.
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Kousaka Shoji
Nakanishi Masahito
Satoh Masahiro
Tanaka Kouichi
Terazono Masaki
Kyocera Corporation
Robinson Ellis P.
Speer Timothy M.
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