B_4C分散SiC系複合材料の微細組織と機械的性質(<特集>セラミック材料)

概要

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The effect of micronsize-B_4C dispersion on the sintering behavior of SiC was investigated for SiC/B_4C composites prepared by hot-pressing method. By use of 4wt% carbon and 1wt% boron as sintering additives, nearly fully dense Sic/B_4C composites were hot-pressed in an argon atmosphere at 2150℃ for 1h of holding time. The effects of B_4C dispersion on the grain size and microstructure of SiC/B_4C composite were also studied by SEM and TEM. The incorporation of micronsize-B_4C into SiC matrix inhibited the sinterability of SiC up to the addition of 10vol%-B_4C for SiC/B_4C composites hot-pressed at 2200℃. However, in the case of adding 20% B_4C, the microstructure consisted of relatively large SiC matrix grains and their morphology was relatively round. Some mechanical properties, Vickers hardness and fracture toughness, were evaluated for the hot-pressed SiC/B_4C composites. The relation between microstructure and mechanical properties was investigated for SiC/B_4C composites.
社団法人日本材料学会の論文
1998-06-15