n-Al_2O_3/Ni复合镀层的组织与滑动磨损性能研究

Study on Microstructures and Sliding Wear Performance of n-Al_2O_3/Ni Composite Coating

用电刷镀技术制得了镍基 n- Al2 O3复合镀层 ,并对镀层的滑动磨损性能进行了试验研究。纳米复合镀层的表面形貌比较细腻 ,镀层中纳米粒子分布均匀 ,与基质金属结合紧密。镀层显微硬度达到 HV70 0 ,比快速镍镀层提高约4 0 %。滑动磨损试验结果表明 ,随着纳米粒子含量的增大 ,镀层的耐磨性提高 ,摩擦系数也呈增大趋势 ;但当镀层中n- Al2 O3粒子的超过 2 .5 6 % (质量分数 )时 ,镀层的耐磨性显著下降。纳米复合镀层的磨损机制以疲劳磨损为主 ,而快速镍镀层以粘着磨损为主。

The nano composite coating containing n Al 2O 3 was prepared by electro brush plating, and the sliding wear performance of the coatings was investigated Its surface morphology is flat and compact The nanoparticles in the coating are integrated tightly with the nickel and the distribution in the coating is uniform Hardness of the coating can reach to HV700, higher 40% than the quick speed nickel coating The results of sliding wear testing show that the wear resistance and friction coefficient of the nano composite coatings increase with the increase of the n Al 2O 3 particle content When the n Al 2O 3 is above 2 56%(mass fraction), the wear resistance decreases significantly The wear mechanism of the nano composite coating is mainly fatigue wear and that of the pure nickel coating is mainly adhesion wear