Study On Preparation And Properties Of Cast-WC/Ni-based Filler Composite For Brazecoating

One of the main researching and developing aspects of composite materials in recent years is the using of composite materials in abrasive wear conditions. With the development of industry, the demand of wear-resisting metals became much more bigger. At the same time it also set the new request to the wear-resisting metals performance. Therefore, it is of great importance to exploit new metal matrix composites to friction and wear.In this dissertation, the casting tungsten carbide are chosen as the reinforcement phase of the composite while the ni-base filler alloy Ni82CrSiB as the matrix of the composite. On the basis of brazecoating, we prepare new composites to friction and wear by casting penetration and hot-press sintering technology on vacuum. The results show that casting penetration technology can make a much compact(93%) composite with a well reinforcement particle distribution and good integration by metallurgy. Pin on disk two body abrasion tests is performed with different size of SiC abrasive under different loads. The test show that the cast-WC/Ni82CrSiB composites have better wear resistance as 6～10 times as body material high chromium cast iron.Moreover, the morphology, microstructure, hardness of cast-WC/Ni82CrSiB composites are completely observed and determined by using X-ray diffraction(XRD), scanning electronic microscope(SEM), HRS-150 rockwellhardness tester, optical microscope, and 71-microhardness tester. At the same time, we analyse the reason why the hot-press sintering composites have much gap and drawback. This build a better theoretical ground for studying the new cast-WC/Ni-based filler alloy composite for brazecoating.