Abstract: The nickel-based tungsten carbide composite was applied in the form of coatings on a stainless steel substrate by furnace sintering technology． The composition and distribution of metal-ceramic phases，and their effects on wear resistance were characterized by X-ray diffraction ( XRD) ，scaning electron microscope ( SEM) and energy dispersive spectrometer ( EDS) ． The wear resistances of coatings were tested by ball-on-disk method． The results indicated that the alloys mainly contained γ-( Ni，Cr) ，carbides ( such as Cr23C6) and borides( such as Ni3B) ，and WC particles． High concentration of WC resulted in abnormal grain growth by solution-precipitation mechanism and deposition of hardfacing particles in coatings． A 190 μm thickness diffusion region formed between the coating and the substrate，and the microhardness decreased dramatically from diffusion region to coating bottom． The concentration，the particle size and the distribution of WC had great effects on the wear resistance． The wear resistance of lower part of coatings was better than that of upper part，and 40% WC coating showed the best performance．
Key words: nickel base; WC; structure; distribution; wear resistance
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