Patent ID: 7582367

Claim:
A ceramic member comprising: a base including an alumina sintered body, a yttria sintered body formed on the alumina sintered body and exposed to a corrosive gas, and an intermediate layer including yttrium and aluminum formed between the alumina sintered body and the yttria sintered body; and a metallic member buried in the intermediate layer of the base; wherein a difference between a thermal expansion coefficient of the alumina sintered body and a thermal expansion coefficient of the yttria sintered body is equal to or less than about 0.50×10 −6 /K; wherein the thermal expansion coefficient of the alumnina sintered body is greater than the thermal expansion coefficient of the yttria sintered body; wherein the alumina sintered body, the intermediate layer, the yttria sintered body, and the metallic member are formed into an integrated sintered body; and wherein a content of yttria in the yttria sintered body is 99 wt % or more.