ALLOY COATING FOR DIFFUSION BARRIER, METHOD FOR FORMING SAME, AND HIGH-TEMPERATURE DEVICE MEMBER

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Disclosed is an alloy coating for diffusion barrier which comprises a diffusion barrier layer having more excellent diffusion barrier characteristics than Re-Cr alloy coatings and durable for use at a higher temperature (specifically at 1, 150˚C or more). A diffusion barrier layer (18) is composed of an Re-W σ phase having an atomic composition consisting of 12.5-56.5% of W and the balance of Re excluding unavoidable impurities. A high-temperature device member can be obtained by coating the surface of a metal base (10) with the diffusion barrier layer (18), and if necessary, further coating the surface of the diffusion barrier layer (18) with an alloy layer (20) for diffusion which has an atomic composition including not less than 10% and less than 50% of Al, Cr or Si.