(1. 浙江工业大学 材料科学与工程学院，杭州 310032；
2. 浙江工业大学 机械工程学院，杭州 310032)
摘 要: 采用化学镀技术制备不同纳米氧化铝含量的Ni-P-Al2O3 复合镀层，并利用扫描电子显微镜(SEM)、X射线能谱仪(EDS)和X射线衍射仪(XRD)对镀层的表面形貌、化学成分及微观结构进行表征，考察镀层在600 ℃下的高温氧化性能，并采用高温摩擦磨损试验机对镀层在200 ℃和600 ℃下的摩擦磨损性能进行测试，分析其磨损机理。结果表明：纳米氧化铝的加入可有效提高镀层的高温耐磨性能和抗高温氧化性能。随着镀液中纳米Al2O3用量的增加，镀层的氧化质量增加，摩擦因数先减少后增加，镀层的磨损机理发生变化。镀液中纳米Al2O3用量为3 g/L时，镀层具有优异的抗高温氧化性能、较低的摩擦因数和较低的磨损率。复合镀层在较高温度磨损过程中呈现出较高的磨损率和较低的摩擦因数。
关键字: 纳米Al2O3；镍磷合金；化学镀；摩擦；磨损；高温氧化
（1. College of Materials Science and Engineering, Zhejiang University of Technology, Hangzhou 310032, China;
2. College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou 310032, China）
Abstract:Ni-P-Al2O3 composite coatings with various contents of nano-Al2O3 particles were prepared by using electroless plating technique. The morphology, microstructure and chemical composition of the coatings were characterized by scanning electron microscopy (SEM), energy disperse spectrum (EDS) and X-ray diffraction (XRD) techniques. The high-temperature oxidizing behavior of the coatings at 600 ℃ was investigated, the tribological properties of the coatings at 200 ℃ and 600 ℃ were evaluated by high-temperature wear instrument, and the wear mechanism was also discussed. The results show that the addition of nano-Al2O3 particles in electroless plating bath can effectively improve the high-temperature wear resistance and the high-temperature oxidation resistance of the composite coatings. With the increase of nano-Al2O3 concentration in bath, the oxidation mass increment and the friction coefficient of the coatings decrease at first, and then increase, and the wear mechanism of the coatings is altered. The composite coating prepared by a nano-Al2O3 concentration of 3 g/L in bath exhibits a good high-temperature oxidation resistance, low friction coefficient and low wear rate. Compared those of the coatings tested at lower temperature, a higher wear rate and a lower friction coefficient of the coatings are obtained under higher test temperature.
Key words: Nano-Al2O3; Ni-P alloy; electroless plating; friction; wear; high-temperature oxidation
