PISTON RING AND THERMAL SPRAYED COATING FOR USE THEREIN, AND METHOD FOR MANUFACTURE THEREOF

摘要

A sprayed coating which comprises chromium carbide particles having an average particle diameter of 5 mum or less and a matrix metal of a Ni-Cr alloy or a Ni-Cr alloy and Ni, wherein the sprayed coating has pores having an average diameter of 10 mum or less and a porosity of 8 vol % or less; and a piston ring having the sprayed coating at least on the sliding surface of the perimeter thereof. The sprayed coating has a markedly fine structure and is homogeneous, and thus the piston ring is excellent in the resistance to wear, seizure and exfoliation and also is reduced in the attack against a mating material.