Tribological behavior of laser thermal sprayed Cr3C2–NiCr + 10%Ni/MoS2 composite coating on H13 hot work mould steel

Cr 3 C 2 –NiCr+10%Ni/MoS 2 composite coating was fabricated on H13 hot work mould steel using a Laser Thermal Spraying (LTS). The friction–wear behaviors of obtained coating at 25, 400 and 700 °C were investigated using a ball–on–disc wear tester, and the effect of MoS 2 on the lubrication in the friction–wear process was also discussed. The results show that the average coefficients of friction (COFs) of Cr 3 C 2 –NiCr+10%Ni/MoS 2 coating at 25, 400 and 700 °C are 0.68, 0.55, and 0.35, respectively, and the corresponding wear rates are 25.97 × 10 –6 , 30.06 × 10 –6 , and 11.86 × 10 –6 mm 3  · N –1  · s –1 , respectively. The average COF and wear rate at 700 °C are the lowest among the three kinds of operation temperatures, the MoS 2 particles and oxidation layer play a positive role of lubrication, which is the main factor of friction–wear reduction. The wear mechanism at 25 °C is abrasive wear, while those at 400 and 700 °C are primary abrasive wear, accompanied by oxidative wear.