Abstract:In this paper, Mo and B4C powders are added to the initial WC-Co system, and the thermal spray powder containing ternary boride is prepared by ball milling mixture-spray granulation-vacuum sintering technology. Meanwhile, WC-MoCoB coating is prepared by the high-velocity oxygen-fuel (HVOF) spray process. The microstructure, mechanical properties, phase composition and friction and wear properties of the coating were characterized by SEM, hardness tester, indentation tester, X-ray diffraction and sliding wear test. The results show that WC-MoCoB coating with low porosity and compact microstructure; the hardness distribution stability; elastic modulus and fracture toughness of the coating have been improved compared with conventional WC-Co coating. The enhancement of the sliding wear performance of WC-MoCoB coating is mainly reflected in the lower friction coefficient and significantly reduced wear rate. At the same time, the increased plastic deformation limitation, the inhibition of microplow cutting, the enhanced interface combination and improved mechanical properties all play a key role in the wear process which effectively resists wear.