(1. 浙江工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院，杭州 310032；
2. 浙江工業(yè)大學(xué) 機械工程學(xué)院，杭州 310032)
摘 要: 采用化學(xué)鍍技術(shù)制備不同納米氧化鋁含量的Ni-P-Al2O3 復(fù)合鍍層，并利用掃描電子顯微鏡(SEM)、X射線能譜儀(EDS)和X射線衍射儀(XRD)對鍍層的表面形貌、化學(xué)成分及微觀結(jié)構(gòu)進行表征，考察鍍層在600 ℃下的高溫氧化性能，并采用高溫摩擦磨損試驗機對鍍層在200 ℃和600 ℃下的摩擦磨損性能進行測試，分析其磨損機理。結(jié)果表明：納米氧化鋁的加入可有效提高鍍層的高溫耐磨性能和抗高溫氧化性能。隨著鍍液中納米Al2O3用量的增加，鍍層的氧化質(zhì)量增加，摩擦因數(shù)先減少后增加，鍍層的磨損機理發(fā)生變化。鍍液中納米Al2O3用量為3 g/L時，鍍層具有優(yōu)異的抗高溫氧化性能、較低的摩擦因數(shù)和較低的磨損率。復(fù)合鍍層在較高溫度磨損過程中呈現(xiàn)出較高的磨損率和較低的摩擦因數(shù)。
關(guān)鍵字: 納米Al2O3；鎳磷合金；化學(xué)鍍；摩擦；磨損；高溫氧化
（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
