HARDENING TREATMENT METHOD OF LINER SURFACE PART OF CAST IRON CYLINDER BLOCK FOR INTERNAL COMBUSTION ENGINE

摘要

PROBLEM TO BE SOLVED: To provide a hardening treatment method of a liner surface part of a cast iron cylinder block as an engine component.

SOLUTION: In the hardening method of the liner surface part of the cast iron cylinder block for an internal combustion engine, an absorbent 10 in which graphite powder is diluted with a solvent such as a thinner is coated on a coating film of the liner surface part 26 of an inner wall of the dried cylinder block 25 and MC-based carbide is sintered during laser or electron beam irradiation. By promoting the diffusion of metal powders on a cast iron base material, an alloy layer 22 is formed on the liner surface part 26 of the inner wall of the cylinder block 25.

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