| 摘要 |
PURPOSE:To promote the improvement of wearing resistance, by forming a sliding surface by a compound film layer constituted such that hard quality particles are dispersed in a plated base layer of iron, cobalt and phosphor alloy. CONSTITUTION:A piston ring 1 forms its sliding surface by a compound film layer 2 in which hard quality particles of 0.5-10mum mean grain size are dispersed by a 5-30% range by volume ratio in a plated base layer of iron, cobalt and phosphor alloy consisting of 0.2-10wt% phosphor, 10-40wt% cobalt and the rest of iron. The phosphor contained in the alloy base layer increases hardness if thermo-setting treatment is applied, displaying an excellent effect in wearing resistance. Metal nitride, metal carbide and metal oxide of silicon nitride, silicon carbide, titanium carbide, zirconia, alumina, cobalt oxide, etc. are suitable for the hard quality particle.
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