COMPOSITE CERAMIC AND METHOD FOR PRODUCING SAME

摘要

Disclosed is a composite ceramic which is composed of a bulk alumina crystal phase (A) having an aspect ratio of not more than 3, a bulk zirconia crystal phase (B) having an aspect ratio of not more than 3 and a columnar crystal (C) of a complex oxide containing an alkaline earth metal and aluminum element which has an aspect ratio of more than 3. This composite ceramic has excellent flexural strength, excellent toughness, high hardness, excellent hot water resistance, and high transverse strength after thermal degradation resistance test.