Kolvring

摘要

PROBLEM TO BE SOLVED: To provide a piston ring capable of being used in a marine diesel engine or an automobile diesel engine in which excellent corrosion resistance and mate attackability resistance are required. SOLUTION: A composite thermal sprayed coating C consisting of a first layer A as an undercoat having the composition consisting of 20-80% Cr3 C2 , and the balance i-Cr, and a second layer B as a top coat having the composition consisting of <=30wt.% Cr3 C2 /Ni-Cr is dispersed as hard particles in the material of a sliding surface of cobalt radial or nickel radial mainly composed of Mo and Cr is formed on a base metal M of at least an outer circumferential sliding surface of a piston ring 10 through the high velocity oxygen flame spraying.