| 摘要 |
PROBLEM TO BE SOLVED: To produce a surface coated sintered alloy improved in the adhesion of a hard film and improved in the life of a tool by paying attention to the boundary between a sintered alloy base material and a hard film and increasing bonding strength between the base material and the hard film and to provide a production method thereof. SOLUTION: This is a surface coated sintered alloy in which a sintered alloy composed of cemented carbide or cermet contg. a hard phase and a bonding phase is used as a base material, and the surface of the base material is coated with a hard film composed of at least one kind of single layer or laminate of >= two layers selected from the carbides, nitrides and oxides of the group 4a, 5a and 6a elements in the Periodic Table, aluminum and silicon and mutual solid solutions thereamong. In the hard film coated just on at least the hard phase particles in the boundaries between the base material and the hard film, a diffusion element-contg. layer in which at least one kind of diffusion element different from the elements composing the hard film is almost uniformly diffused is formed.
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