中文摘要：

采用直流电沉积技术在45#钢基体上制备Ni-W-Al2O3复合镀层,通过显微硬度计、摩擦磨损试验机、划痕仪等研究Al2O3颗粒含量对复合镀层的力学性能及摩擦磨损性能等的影响,并用SEM、XRD对复合镀层的表面断面形貌、物相结构进行分析.结果表明,Ni-W-Al2O3复合镀层为晶态结构,其耐磨性能明显优于Ni-W镀层,且随着Al2O3颗粒含量的增加,复合镀层的摩擦系数呈现出先减小后增大趋势.磨损形式主要表现为粘着磨损与磨粒磨损.复合镀层与基体之间结合牢固,结合力大小约为70-80 N.当Al2O3含量为5 g/L时,复合镀层的综合性能最优.

英文摘要：

Composite coatings of Ni-W-Al2O3 were prepared on 45# steel substrate by direct current electrode- position technology in electrolytic plating bath. The effect of Al2O3 particle concentration on wear and mechan- ical properties of composite coatings was investigated through microhardness, friction and wear testing machine and adhesion scratch tester. Surface and cross-section morphology of composite coatings were observed by SEM and XRD. The results show that Ni-W-Al2O3 composite coating presents crystalline structure, and its wear resistance is better than that of Ni-W coating. Increasing of the Al2O3 particles concentration in the elec- trolyte in a constant stirring rate will lead to a decrease first and then increase tendency in friction coefficient of composites coatings. The wear mechanisms of composite coatings are mainly adhesive wear and abrasive wear. Binding force of composite coatings and substrate is about 70-80 N which is fairly firm. The comprehen- sive performance of the composite coatings is the best when Al2O3 concentration is 5 g/L.