| 简介 |
PROBLEM TO BE SOLVED : To provide a heat-resistant alloy having a coating structure superior in anti-oxidation, by suppressing the peeling of a surface oxide layer for intercepting oxygen from the alloy and the progress of oxidation.
SOLUTION : In the anti-oxidation coating structure of the heat-resistant alloy, a first layer alloy film for preventing diffusion is formed on the surface of the heat-resistant alloy as needed, and on the first layer alloy film, a second layer composite film, in which oxide fibers and particles are dispersed in an alloy layer containing at least Al or Si, is formed. Specially in the case where the heat-resistant alloy is a niobium-based alloy, the first layer alloy film is made to contain Re and at least two kinds of elements forming a stable phase with Re, and the second layer film is made to be a film, in which oxide fibers and oxide particles are scattered in an alloy layer containing at least Al and at least one kind of Cr and Ni. Here, as the fibers, oxide-based ceramic fibers having an aspect ratio of 2-1, 000 or whiskers are used; and as the particles, oxide-based ceramic particles of an average size of 1-50 μm are used.
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