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采用真空热压烧结方法制备了Ni3Al基自润滑复合材料,通过HT-1000型球盘式高温摩擦仪分别测试了不同条件下Ni3Al基自润滑复合材料的摩擦磨损性能.结果表明:复合材料在20～1 000℃均具有良好的自润滑性能,其摩擦系数在0.24～0.43之间.研究发现复合材料在低载(5 N、滑动速度为0.2 m/s)低温(20～400℃)下具有最低的摩擦系数(0.24～0.29),但在低载高温下(600℃以上)摩擦系数较高(0.39～0.41);而在高载(20 N)时在整个温度测试区间(20～1 000℃)拥有低而稳定的摩擦系数(0.28～0.31).Ni3Al基自润滑材料优异的高温摩擦学性能归因于高温下材料摩擦表面形成的银、氟化物、氧化物以及钼酸盐等低剪切化合物的协同润滑作用.
Ni3Al-based self-lubricating composite was prepared by vacuum hot-pressing sintering method, and the tribological properties of Ni3Al-based self-lubricating composite under different conditions were tested by HT-1000 ball-type high temperature friction tester.The results showed that the composite ~ 1 000 ℃, the friction coefficient is between 0.24 and 0.43, and it is found that the composite has the properties of low temperature (20 ~ 400 ℃) at low load (5 N, sliding speed of 0.2 m / s) The lowest coefficient of friction (0.24-0.29), but the higher the coefficient of friction (0.39-0.41) at low temperature (600 ℃) and the lower temperature (20-1 000) ℃) has a low and stable coefficient of friction (0.28 ~ 0.31) .The excellent high-temperature tribological properties of Ni3Al-based self-lubricating materials are attributed to the formation of low shear of silver, fluoride, oxide and molybdate on the frictional surface of the material Cut compound synergistic lubrication.