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以纳米NiCr/WC复合粉末(其中70%的WC与30%的NiCr)(文中含量均为质量分数)为原料,采用活性燃烧超音速火焰喷涂技术制备了纳米NiCr/WC复合涂层。利用SRV高温磨损试验机进行微动磨损试验,结果显示,在其它工艺参数相同的条件下,纳米涂层在喷涂距离为200 mm条件下的耐磨性能最差,在喷涂距离为160 mm条件下的耐磨性能最好;纳米涂层在送粉率为5 rpm条件下的耐磨性能最差,在送粉率为15 rpm条件下的耐磨性能最好。此外,与综合性能优良的渗碳轴承钢20CrNi2Mo相比,所有的纳米涂层的耐磨损性能都明显优于相同温度条件下的轴承钢的耐磨损性能。
Nano-NiCr / WC composite coating was prepared by reactive combustion supersonic flame spraying with nanometer NiCr / WC composite powder (70% WC and 30% NiCr) as content. Using the SRV high temperature wear tester for fretting wear test, the results show that under the same conditions of other process parameters, the nano-coating at the spraying distance of 200 mm under the conditions of the worst wear resistance, spray distance of 160 mm Wear resistance is the best. The nano-coating has the worst wear resistance at the feeding rate of 5 rpm and the wear resistance at the feeding rate of 15 rpm is the best. In addition, all the nano-coatings have significantly better wear resistance than the 20CrNi2Mo carburized bearing steel with good overall performance compared with the bearing steel under the same temperature conditions.