窒化ケイ素複合材料の残留応力による高靭化

抄録

Fracture toughness of Si₃N₄ ceramics with and without addition of TaSi₂ particles, prepared by hot-pressing at 1750°C and 1650°-1750°C, respectively, was determined. The fracture toughness increased significantly with increasing TaSi₂ content. The enhanced toughness by the addition of TaSi₂ particles was interpreted to be due to the residual compressive stress resulting from the larger thermal expansion coefficient of TaSi₂ than that of Si₃N₄.