| 摘要 |
PROBLEM TO BE SOLVED: To realize rigid coating of high Cr concn. by forming a coating layer in such a manner that the particles of an Ni-Cr alloy of high Cr concn. composing the main component fused by an Ni-Cr self-fluxing alloy of low Cr concn. composing an assistant component phase. SOLUTION: The amt. of an assistant component phase self-fluxing alloy is preferably controlled to 10 to 30% of the main component phase alloy, and, the concn. of Cr in the main component phase alloy is desirably controlled to the one higher than that of the assistant component phase self-fluxing alloy by >=5% but is restricted to <=60%. The film thickness of the coating is desirably controlled to 0.5 to 3 mm. The coating is formed by preparing a coating material obtd. by mixing high Cr alloy powder and low Cr alloy powder, sticking the coating material on the face as the object for coating in layers by a thermal spraying method or the like to form a temporary coating layer, thereafter executing melting treatment and passing at least the low Cr self-fluxing alloy in the temporary coating layer through a melted state. The melting treatment is desirably selected in accordance with the m.p. of the low Cr self-fluxing alloy in the range of 1000 to 1250 deg.C. For providing the high Cr alloy with self-fluxing properties, B and Si are blended by the amounts in the range free from troubles.
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