B4C分散SiC系複合材料の微細組織と機械的性質
1998 年 47 巻 6 号 p. 571-575
詳細
1998 年 47 巻 6 号 p. 571-575
The effect of micronsize-B4C dispersion on the sintering behavior of SiC was investigated for SiC/B4C composites prepared by hot-pressing method. By use of 4wt% carbon and 1wt% boron as sintering additives, nearly fully dense SiC/B4C composites were hot-pressed in an argon atmosphere at 2150°C for 1h of holding time.
The effects of B4C dispersion on the grain size and microstructure of SiC/B4C composite were also studied by SEM and TEM. The incorporation of micronsize-B4C into SiC matrix inhibited the sinterability of SiC up to the addition of 10vol%-B4C for SiC/B4C composites hot-pressed at 2200°C. However, in the case of adding 20% B4C, 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/B4C composites. The relation between microstructure and mechanical properties was investigated for SiC/B4C composites.
