Effect of Cryogenic Treatment on Friction and Wear Property of DLC Film/304 Stainless Steel

Abstract

The systems of DLC film/304 stainless steel were separately treated with cryogenic treatment,annealing treatment and composite treatment of cryogenic+annealing to study the effects of different treatments on friction and wear property of DLC film/304 stainless steel,mainly from the film’s hardness,fracture toughness and surface roughness. The results show that the friction and wear property of DLC film/304 stainless steel is improved in different degrees by the three kinds of treatment,single cryogenic treatment performs best. It is because that three kinds of treatment all can improve the fracture toughness of DLC film and reduce DLC film’s surface roughness,but only single cryogenic treatment doesn’t reduce film’s hardness and makes film get the best lubricity and highest hardness-to-elasticity ratio. The residual stress of film/substrate composite system can be effectively adjusted by cryogenic or annealing,but annealing often sacrifices DLC film’s hardness as the price.