Sintering and Mechnical Properties of Al₂O₃ Composites with Two-Layered Structure

Abstract

A two layered Al₂O₃, /SiC composite is prepared. The composite consists of un-reinforced Al₂O₃, layer and 10 Vol%-SiC whisker reinforced Al₂O₃, layer, which are simultaneously sintered by hotpressing. Flexural strength of the composite reaches 300MPa and diffrence fracture toughness K_ic: are observed for two layers, namely, 5MPam^1/2 for reinforced layer and 2MPam^1/2 for un-reinforced layer, respectively. Also, thermal stresses resulted in during cooling down to room temperature is discussed.