Patent ID: 7564008

Claim:
An alumina member, comprising: a base of a sintered body containing alumina; a power-supplied member embedded in the base and supplied with electric power, said power-supplied member being at least one of an electrode and a resistance heating element; a bonding member embedded in the base and bonded to the power-supplied member by hot-pressing, said bonding member having the shape of a disc or a ball and comprising niobium; a terminal bonded to the power-supplied member through the bonding member, wherein a difference in coefficient of thermal expansion between the bonding member and the sintered body is 2×10 −6 /K or less, a melting point of the bonding member is higher than a baking temperature of the sintered body, and a portion of the base positioned below the power-supplied member and at a periphery of the bonding member contains 1.4-1.5 wt % carbon.