【作者】 常立民； 安茂忠； 石淑云；

【Author】 Chang Limin An Maozhong Shi Shuyun (Department of Applied Chemistry,Harbin Institute of Technology,Harbin 150001,People’s Republic of China;Analysis and Measure Center,Jilin Normal University,Siping 136000)

【机构】 哈尔滨工业大学应用化学系； 吉林师范大学分析测试中心；

【摘要】 提出了一种利用双向脉冲电沉积技术制备 Ni-Co/纳米 Al₂O₃复合镀层的新方法,并用 X 射线衍射（XRD）、扫描电镜/能谱（SEM/EDS）、透射电镜（TEM）等测试方法研究了复合镀层的组织与性能。结果表明:采用双向脉冲电沉积技术可获得结晶细密、表面光滑平整,Al₂O₃粒子分布均匀且与基体有良好结合以及基质金属镍（220）晶面产生择优取向的复合电沉积层;在本试验范围内,复合镀层的硬度和耐磨性随着 Al₂O₃含量的增加而提高,双向脉冲镀层硬度和耐磨性都优于直流镀层,而双向脉冲镀层宏观残余应力却低于直流镀层。更多还原

【Abstract】 It is introduced a novel method for preparing Ni-Co/Al₂O₃ nano-composite coating by using a bidirectional pulse electrodeposit technique,and the microstructure and properties of Ni-Co/Al₂O₃ nano-composite coating was studied by XRD、SEM/EDS、TEM and property test.The results show that the distribution of Al₂O₃ in the coating is uniform,the crystal of matrix Ni are fine and close,the surface of coating is smooth,and leads to a crystal preferential orientation along （220） crystal face under bidirectional pulse current,the hardness and wear resistance of the composite coating increase with the increase of the Al₂O₃ particle content in the range of the experiment.The hardness and wear resistance of Ni-Co/Al₂O₃ nano-composite coating deposited by bidirectional pulse current are better than those by direct current,but the macro-residual stress of Ni-Co/Al₂O₃ nano-composite coating deposited by bidirectional pulse current is lower than that by direct current.更多还原