喷涂工艺参数对热喷涂纳米镍铬碳化钨涂层微动磨损性能的影响

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。

Effects of Process Conditions on Fretting Wear Properties of Thermal Sprayed NiCr/WC Nanostructured Coating

Nanostructured coatings of NiCr/WC(70%WC,30%NiCr) were prepared via actived-combustion-high velocity air fuel(AC-HVAF).Fretting wear test was carried out by SRV high temperature wearing equipment.The results show that the thermal sprayed NiCr/WC nanostructured coating prepared from the spraying distance of 160 mm has the best fretting wear properties under the same other process parameters,and the nanostructured coating prepared from the spraying distance of 200 mm has the worst fretting wear properties.The nanostructured coating prepared at the powder feed rate of 15 rpm has the best fretting wear properties under the same other process parameters,the nanostructured coating prepared at the powder feed rate of 5 rpm has the worst fretting wear properties,respectively.In addition,compared to the carburizing bearing steel 20CrNi2Mo with excellent overall performance,the wearing resistances of all nanostructured coatings are better than that of the carburizing bearing steel under the same wear conditions.