激光镍包纳米Al_2O_3增强复合涂层的摩擦磨损性能研究  

Tribological Properties of Ni-clad Nano-Al_2O_3 Composite Coatings by High-energy Laser Irradiation

作　　者：居毅[1] 郭绍义[1] 陈生钻[1] 叶秉良[1] 

机构地区：[1]浙江理工大学表面工程研究所,浙江杭州310018

出　　处：《摩擦学学报》2007年第1期50-53,共4页Tribology

基　　金：浙江省自然科学基金资助项目(Y404277);浙江省科技攻关重点项目资助(2005C21044)

摘　　要：采用大功率CO2激光器在45#钢基体上制备激光熔覆镍包纳米A l2O3复合涂层,采用金相显微镜观察涂层表面形貌,在销-盘式摩擦磨损试验机上评价复合涂层与45#碳钢配副的摩擦磨损性能.结果表明:经激光熔覆处理制备的镍包纳米A l2O3复合涂层的耐磨性能显著提高,磨损质量损失降低38%,摩擦系数降低40%;复合涂层中纳米A l2O3的配比对其耐磨性影响显著,高配比涂层具有较好的耐磨性,而摩擦系数与A l2O3配比的关系不大.Ni-clad nano-Al2O3 composite coatings were prepared on carbon steel plate by high power continuous wave CO2 laser beam. The fabrication of Ni-clad nano-Al2O3 composite coatings was investigated. The friction properties were examined under dry sliding condition using pin-on-disc tester. The results showed that the Ni-clad nano- Al2O3 composite coating had a microhardness value of 810Hv, greater than for without treated ones. The Ni-clad nano-Al2O3 composite coating possessed not only a higher wear resistance but also a lower friction coefficient. It is interest to note that the wear mass loss and friction coefficient of Ni-clad nano-Al2O3 composite coatings reduced to about 38% and 40% in comparison with those without coating respectively. The nano-Al2O3 were uniformly distributed in the carbon steel matrix and greatly increased the microhardness and tribological properties of the Ni-clad nano-Al2O3 composite coatings. The results also showed that the amount of Al2O3 significantly affected wear resistance of Ni-clad nano-Al2O3 composite coatings but they had little influence on their friction coefficient.

关 键 词：镍包纳米氧化铝 复合涂层 激光熔覆 摩擦磨损性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理] TH117.3[金属学及工艺—金属学]