To explore the wear resistance in the surface modification processof DLC coating (Diamond like carbon films)

nitriding and salt bath composite treatment (Quench Polish Quench

QPQ) on the substrate surface of cold work die steel Cr12MoV. Based on the high-frequency reciprocating ball disk pairing pair of the friction testing machine

the friction and wear properties of the surface modified Cr12MoV sample disk paired with Si3N4 ceramic ball were tested under the simulated conditions. The study showed that under the simulated conditions

the analysis of friction coefficient and volume-wear rate showed that DLC coating was more suitable for improving the wear resistance of Cr12MoV surface

and its wear resistance is more than 4 times higher than that vianitriding/QPQ

a carbon transfer film is formed on the surface of Si3N4 ceramic grinding ball to prevent the wear of DLC material. DLC coating provides the experimental support for improving the wear resistance of Cr12MoV surface.The adhesion degree of DLC test plate is more serious than that of nitriding test plate

because the high hardness metal has stronger anti-adhesion ability than that of the low hardness metal. The surface of DLC and QPQ sample discs has plastic deformation

and the surface of QPQ sample disc formed flake pits.