WC-SiC系硬質セラミック材料の合成および機械的性質に関する研究
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This paper reviews our investigations for developing new types of binderless cemented carbides, WC-SiC ceramics. We first found that WC-SiC whisker powder mixtures were consolidated by using a resistance-heated hot pressing at a much lower temperature than pure WC powder. Eventually, regardless of whether SiC was added to WC powder in the form of whisker or powder, SiC addition was very effective for the densification of WC powder. Simultaneously the SiC addition vigorously grew WC grains and resulted in lowering the hardness of ceramics. This problem was overcome by the addition of a small amount of Cr<SUB>3</SUB>C<SUB>2</SUB> or V<SUB>8</SUB>C<SUB>7</SUB> widely known as a inhibitor of WC grain growth in WC-Co cemented carbides. Finally, for WC-10 mol% SiC-0.7 mol% Cr<SUB>3</SUB>C<SUB>2</SUB>, almost fully dense ceramics were obtained by pressureless sintering at 1750°C.
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