铝合金表面机械球磨Ni-Al-Mo复合涂层的制备及其摩擦特性研究

通过机械球磨方法在铝合金表面制备了Ni-Al-Mo复合涂层,对涂层微观组织、组成成分和摩擦学性能等进行了分析.结果表明:经过7 h机械球磨制备的Ni-Al-Mo复合涂层内元素均匀分布;550℃退火后涂层中均有Al3 Ni金属间化合物新相生成;复合涂层中Al3 Ni和Mo的存在使得涂层硬度高于铝合金基体和Ni-Al涂层,...

Tribological properties of Ni-Al-Mo composite coating on Al alloy surface preparation by mechanical milling

Ni-Al-Mo composite coating was prepared on surface of aluminum alloy by the method of mechanical milling. And the microstructure of coating,composition and tribological properties of the coating were analyzed. The result show that the elements in the Ni-Al-Mo composite coating are evenly distributed after 7 h mechanical ball milling. After annealing at 550 ℃,new phases of Al₃Ni intermetallic were formed in the coating. The presence of Al₃Ni and Mo in the composite coating makes the coating hardness higher than that of aluminum alloy substrate and Ni-Al coating, the coating hardness increases with the increase of Mo content, and that is respectively about 105 HV, 125 HV and 167 HV at the addition amount of10%, 20% and 30%; The increase of coating hardness effectively reduces the wear rate,and the wear rate of the coating is about0.4×10^－3～0.6×10^－3mm³/(N·m); The excellent friction coefficient and wear rate of the composite coating effectively protect the aluminum alloy matrix.