ポリカルボシラン/アルミナ粉末/バインダー混合系から作製したSiC/Al₂O₃複合シートの曲げ強度

抄録

A SiC/Al₂O₃ composite sheet was prepared from a green sheet composed of polycarbosilane (PCS) and Al₂O₃ powder with the weight ratio of 2:1. The green sheet was fired in the temperature range of 1200° to 1400°C under N₂ gas atmosphere, and three point bending strength of the composite was examined. The strength in room temperature increased with firing temperature and showed the maximum value of 333MPa at 1300°C. Dispersion of Al₂O₃ particles in the SiC matrix was effective to increase the strength of monolithic SiC sheet derived from PCS. When the composite was fired at 1400°C, however, the bending strength dropped rapidly in a similar manner as PCS-derived SiC fiber.