La2O3对激光熔覆镍基纳米Al2O3复合涂层组织和性能的影响  

Influence of La2O3 on microstructure and performance of Laser cladding Ni-based nano-Al2O3 composite coatings

作　　者：彭成章[1] 

机构地区：[1]湖南科技大学机械设备健康维护重点实验室

出　　处：《激光杂志》2010年第4期43-45,共3页Laser Journal

基　　金：国家自然基金资助项目(50764004);江西省教育厅科技资助项目(赣教技字〔2007〕202号)

摘　　要：采用激光熔覆技术在Q235钢基体上制备了不同La2O3含量的镍基纳米Al2O3复合涂层。通过扫描电镜观察分析了熔覆层的微观组织结构,并对熔覆层的显微硬度和摩擦磨损性能进行了测试。试验结果表明,加入1.5wt%稀土La2O3时,熔覆层组织显著细化,由细小的等轴树枝晶和共晶组织组成,熔覆涂层的显微硬度在651.4HV0.2至732.4HV0.2之间,耐磨性能显著提高。The Ni-based nano-Al2O3 composite coatings with different addition of La2O3 were obtained by laser cladding on the surface of Q235 steel.The microstructure of the coatings was investigated and analysed by scanning electron microscope（SEM） and XRD respectively,the microhardness and wear-resistance of the coatings were tested.The results show that the microstructure of the coating is refined obviously by adding 1.5 wt% La2O3,which consistes of equiaxed dendrite and eutectic structure,the microhardness is 651.4～732.4HV0.2,the wear resistance is improved greatly.

关 键 词：激光熔覆 复合涂层 稀土 

分 类 号：TG159.99[金属学及工艺—热处理]