Method for preventing seepage of Si or Si alloy

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PROBLEM TO BE SOLVED : To provide a composite of a ceramic material and a metal coating, having a new structure capable of preventing an alloy from wetting and effusing from a patterned section, while the composite is composed of an aluminum nitride ceramic base material and a Si or Si alloy coating and has the structure where the Si or Si alloy coating is selectively patterned and fused on the aluminum nitride ceramic base material. SOLUTION : This composite of the ceramic material and the metal coating has the structure where the Si or Si alloy coating is subjected to selective patterning so as to form a pattered surface and fused on the aluminum nitride ceramic base material containing a rare earth element compound as a sintering additive, wherein the content of the sintering additive component in an area of the above patterned surface on which the metal coating is not fused and the ceramic base material is exposed is not more than 0.5% when converted into an amount of the rare earth metal oxide.