Abstract：WC-10Co-4Cr coating was prepared on Q235 steel substrate by high velocity oxygen fuel (HVOF) spray process. The microstructure and wear properties of the WC-10Co-4Cr coating were investigated by transmission electron microscopy(TEM), scanning electron microscopy(SEM), X-ray diffraction(XRD), microhardness tester and friction-abrasion testing machine. The results show that the coating exhibits dense structure with the porosity of 0.67% and compact bonding with the substrate. The coating is mainly composed of WC, and a small amount of W2C and amorphous phases as well, and the average microhardness of the coating is 1230HV0.3. The cumulative mass loss of WC-10Co-4Cr coating is only 2/5 of the cold work die steel Cr12MoV, which indicates the WC-10Co-4Cr coating exhibits better abrasive properties. The abrasive wear is the main wear mechanism for the coating.
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2018, Vol. 46 
