电沉积Ni-La_2O_3纳米复合镀层的摩擦磨损性能  

Friction and Wear Properties of Electrodeposited Ni-La_2O_3 Nanocomposite Coatings

作　　者：薛玉君[1] 朱荻[1] 靳广虎[1] 赵飞[1] 

机构地区：[1]南京航空航天大学机电学院,江苏南京210016

出　　处：《摩擦学学报》2005年第1期1-6,共6页Tribology

基　　金：中国博士后科学基金资助项目(2002032192);国防预研基金资助项目(J1500E002).

摘　　要：用复合电沉积方法制备了Ni-La2O3纳米复合镀层,研究了La2O3纳米颗粒含量对纳米复合镀层摩擦磨损性能的影响,并用扫描电子显微镜分析了其磨损机理.结果表明,在干摩擦条件下,随着La2O3纳米颗粒含量的增加,纳米复合镀层的摩擦系数降低,耐磨性能提高;La2O3质量分数为3.1%的纳米复合镀层的摩擦系数最低,耐磨性能最佳;纯Ni镀层呈现严重的粘着磨损特征,而纳米复合镀层主要呈现轻微磨粒磨损特征.Ni-La2O3 nanocomposite coatings were prepared using composite electrodeposition method. The friction and wear properties of the nanocomposite coatings sliding against AISI1045 steel in a pin-on-disc contact configuration under unlubricated condition were investigated, with the effect of the nano-La2O3 content on the friction and wear behaviors of the composite coatings to be emphasized. The worn surfaces of the composite coatings were analyzed using a scanning electron microscope and compared with that of the electrodeposited pure Ni coating. It was found that the incorporation of the nano-La2O3 particulates contributed to decrease the friction coefficient to some extent and to reduce the wear mass loss significantly. Moreover, the friction and wear behaviors of the nanocomposite coatings were closely related with the nano-La2O3 content. Namely, the nanocomposite coating with a lower nano-La2O3 content of 1.1% showed somewhat increased wear-resistance than the pure Ni coating, while the composite coating with a higher nano-La2O3 content had much better wear-resistance than the pure Ni coating. The increased wear-resistance of the composite coatings was attributed to the dispersive strengthening effect and grain-size-decreasing effect of the nano-La2O3, which made the hardness and compactness of the composite coatings increased, and hence the wear-resistance was greatly increased. Besides, the incorporation of the nano-La2O3 particulates also led to difference in the wear mechanisms of the composite coatings as compared with the pure Ni coating. Namely, the pure Ni coating was characterized by severe adhesion wear and scuffing, while the nanocomposite coatings were dominated by slight abrasive wear. This observation agreed well with the corresponding wear-resistance of different coatings. In addition, it was suggested to keep a higher content in the composite coatings so as to acquire the optimal wear-resistance.

关 键 词：电沉积 Ni—La2O3纳米复合镀层 摩擦磨损性能 

分 类 号：TH117.3[机械工程—机械设计及理论] TQ153.4[化学工程—电化学工业]