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用真空熔烧的方法在钢的表面制得一层与钢基体有牢固冶金结合,厚度为1.0～1.5mm的Ni基白熔合金—碳化铬的复合涂层.应用扫描电子显微镜及X射线衍射仪等仪器对复合涂层的组织和结构进行了观察和分析.采用环块磨损试验机,在油润滑条件下,对不同碳化铬含量的复合涂层与组成的摩擦副进行了磨损试验.试验结果表明,复合涂层的耐磨性能均比作为对比试验的钢对钢的耐磨性能好.其磨损率随碳化铬含量增加而减少.与钢相比复合涂层磨损率减少约一个数量级.与钢对钢及单纯Ni基自熔合金涂层不同,复合涂层对钢的磨损率大致保持不变.在综合分析的基础上,也对复合涂层合理的碳化铬含量进行了讨论.
Using vacuum melting method, a composite coating of Ni-based white fused-carbide-chromium carbide with a thickness of 1.0 ~ 1.5mm was obtained on the surface of the steel with a strong metallurgical bond with the steel substrate.Using scanning electron microscopy and X-ray diffraction Instrument and other equipment to observe and analyze the structure and structure of the composite coating.Using ring block wear testing machine, under the condition of oil lubrication, wear test was carried out on the friction pair with different coatings of chromium carbide and the composition. The results show that the wear resistance of the composite coating is better than that of the steel as the comparative test, and the wear rate decreases with the increase of the content of chromium carbide, and the wear rate of the composite coating is reduced by about one order of magnitude compared with the steel. Different from steel-to-steel and pure Ni-based self-fluxing alloy coating, the wear rate of the composite coating to the steel is almost unchanged, and the reasonable chromium carbide content of the composite coating is also discussed based on the comprehensive analysis.