Assessment of adhesion and tribology characteristics of chromium-based diamond coating for piston ring.

Abstract

Recently, the use of chromium-based diamond coating on the piston ring's running surface has remarkable attention due to its sound friction reduction and wear resistance to improve the lifetime of the piston ring. The piston ring's adhesion and tribology characteristics with chromium-based diamond coating on grey cast iron and ductile cast iron as a base material were investigated using scratch test and pin-on-reciprocating test in this work. The chromium steel ball was used as counterpart sliding against piston ring specimens in the wear test. The results showed that the work of adhesion, friction coefficient, and wear rate of piston ring with base material of ductile cast iron was better than of grey cast iron. Compared with grey cast iron, the work of adhesion of ductile cast iron and coating increased by 66%. The friction coefficient in the case of ductile cast iron was slightly smaller than that of grey cast iron. The wear rate of the piston ring with ductile cast iron was reduced by up to 36% at 40 N of normal force compared to grey cast iron. The outcomes of this work showed the promising applications of chromium-based diamond coating on ductile cast iron of piston ring in the field condition.