In this study, oxidation and wear resistance of new WC-NiP coatings is evaluated and compared with commercial WC-Ni coatings. To prepare WC-NiP coating, the tungsten carbide particles with the mean size of 1.4?m was coated by Ni-P electroless process in different conditions primly. The optimum condition of this process was adding 20g of pickled WC in one liter of Ni-P electroless bath. The XRF analysis results represented that about 14% nickel was precipitate on the tungsten carbide powder surface in optimum condition. Because of the reaction between released H 2 and the surface of WC particles during electroless process, undesirable picks of W 2 C appeared in WC-NiP powder XRD pattern. According to the fine size of NiP coated particles, spray drier process was accomplished and a powder with size of 25 to 90?m and spherical morphology was obtained. The HVOF process of powder particles was done on the surface of ST37 and stainless steel. The XRD analysis results of the coatings showed that W 2 C and ? phases exists in WC-Ni coating structure, while the WC-NiP coating consists of crystalline/amorphous Ni, W and W 2 C phases. The approximate W 2 C weight percent in WC-Ni and WC-NiP coatings, was 1.9 and 10.5% respectively. The microhardness test with the load of 500g, showed that the mean values of hardness in cross section of WC-Ni and WC-NiP coatings are 1000 and 900HV respectively. The porosity percent of the coatings was measured by MIP software and was 1.31 and 0.85% in WC-Ni and WC-NIP coating respectively. The wear resistance of WC-Ni coating was 26% more than WC-NiP coating, due to more hardness and less amount of W 2 C phase in structure. In the other hand, the oxidation resistance of WC-NiP coating was 27% more than WC-Ni coating, due to formation of NiO and prevention of WC oxidation. Keywords: WC-Ni cermet, thermal stability, HVOF process, Ni-P electroless
