Patent ID: 7153559

Claim:
A composite body comprising: a structure which has a reservoir formed by combining plural members and at least one material of silver and a silver alloy which has a softening temperature that is lower than a softening temperature of the members constituting the structure, and having a sealing property, wherein the members constituting the structure are made of ceramic and metal, the structure is constituted as combination of ceramic and metal, wherein average linear thermal expansion coefficients from room temperature to 850° C. of the members are at least 16×10 −6 /° C. and at most 26×10 −6 /° C., wherein at least a part of the members is made of an oxide material having oxide ion permeability, wherein the at least one material is filled in the reservoir, and wherein at least a part of a combined boundary portion between the members constituting the structure is filled with the at least one material.