Compositions: ceramic – Ceramic compositions – Refractory
Patent
1997-04-22
1999-07-13
Group, Karl
Compositions: ceramic
Ceramic compositions
Refractory
501 973, 264665, 264666, 264683, C04B 35587
Patent
active
059226293
ABSTRACT:
A silicon nitride ceramic sliding material comprising silicon nitride crystal grains and a grain boundary phase and having a porosity of 2 to 10% and a maximum pore size of 20 to 100 .mu.m. The silicon nitride ceramic sliding material preferably has a textural structure wherein the proportion of the total area of silicon nitride crystal grains of 0.1 to 10 .mu.m.sup.2 in area to the total area of all the silicon nitride crystal grains present in an arbitrary two-dimensional cross section is 30 to 90% and the proportion of the number of silicon nitride crystal grains of 2 to 10 in aspect ratio to the number of all the silicon nitride crystal grains present in that cross section is at least 20%. The material is produced by mixing a silicon nitride powder with a sintering aid powder, molding the resulting mixture, then heat-treating the resulting molded body in a nitrogen-containing atmosphere under reduced pressure at 1,000 to 1,500.degree. C., and then sintering it in a nonoxidizing atmosphere under ordinary pressure or under pressure, at 1,550 to 1,800.degree. C.
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Komura Osamu
Kuibira Akira
Mochida Yasushi
Park Jin-Joo
Yamaguchi Akira
Group Karl
Sumitomo Electric Industries Ltd.
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