医用钛合金激光熔覆金属间化合物基复合涂层研究  

Study of Laser Cladding Intermetallic Composite Coating on Biomedical Titanium Alloy

作　　者：李敏杰[1,2] 吴国龙[1,2] 张杰[1,2] 姚建华[1,2] 

机构地区：[1]浙江工业大学激光加工技术工程研究中心,浙江杭州310014 [2]浙江省高端激光制造装备协同创新中心,浙江杭州310014

出　　处：《应用激光》2015年第4期423-427,共5页Applied Laser

基　　金：浙江省公益技术研究工业资助项目(项目编号:2014C31122);浙江工业大学校自然科学基金重点资助项目(项目编号:1401415014408)

摘　　要：在医用钛合金（TC4）表面采用激光熔覆的方法制备了硬质颗粒增强金属间化合物基复合涂层,采用光学显微镜（OM）、扫描电子显微镜（SEM）、能谱（EDS）定量分析、X射线衍射仪（XRD）、显微硬度计（HV）、极化曲线分别分析了硬质颗粒增强金属间化合物复合涂层的组织形貌、相结构与成分、硬度分布和耐蚀性能。研究结果表明,涂层厚度可达1~2mm,涂层内部有TiNi和Ti2Ni韧性相及TiC、TiB/TiB2和B4C硬质颗粒生成,并且涂层内部组织均匀致密,无裂纹与气孔等缺陷,硬质颗粒增强金属间化合物基复合涂层的硬度可达HV 0.3 899,是基体的近3倍,涂层的耐蚀性是医用钛合金基体的近3倍。The hard particles reinforced intermetallic composite coating was fabricated on biomedical TC4 titanium alloy by laser cladding process in this paper.The microstructure,phase structure and composition,distribution of hardness and corrosion resistance of the hard particles reinforced intermetallic composite coating were analysed by optical microscopy（OM）,scan electron microscopy（SEM）,Energy spectrum（EDS）quantitative analysis,X-ray diffraction（XRD）and polarization curve.The results show that the coating thickness up to 1~2 mm,and sufficiently dense,uniform,crack-free,and without porosity defects,the phase compositions of the coating including hard particles additonal B4C、in-situ synthesis TiB、TiB2and TiC、TiNi/Ti2 Ni dual phase intermetallic composite.The hardness of hard particles reinforced intermetallic composite coating is HV 0.3 899,nearly 3times of the substrate,and the corrosion resistance of the coating is nearly 3times of the substrate.

关 键 词：医用钛合金 激光熔覆 金属间化合物 原位合成 

分 类 号：TG156.99[金属学及工艺—热处理]