稀土氧化物添加量对激光熔覆磷酸钙陶瓷涂层组织性能的影响  

Microstructure and Properties of Calcium Phosphate Ceramic Coating by Laser Cladding with Different Rare Earth Oxides Contents

作　　者：朱益志[1] 刘其斌[1,2] 蒋海兵[1] 徐鹏[1] 

机构地区：[1]贵州大学材料与冶金学院,贵州贵阳550025 [2]贵州省材料结构与强度重点实验室,贵州贵阳550025

出　　处：《稀有金属》2016年第5期509-514,共6页Chinese Journal of Rare Metals

基　　金：国家自然科学基金项目(51362004)资助

摘　　要：β-磷酸三钙(β-TCP)和羟基磷灰石(HA)被视为优良的生物活性材料。本文利用激光熔覆技术在钛合金(Ti6Al4V)表面制备一层含β-TCP和HA的稀土氧化物掺杂磷酸钙陶瓷涂层,通过光学显微镜(OM),X射线衍射(XRD),扫描电镜(SEM)和显微硬度计分别对陶瓷涂层的结合界面、物相、表面形貌及显微硬度进行分析。试验结果表明:基材与陶瓷层呈冶金结合,熔覆试样可分为基材、热影响区、合金化区及陶瓷熔覆层4个区域;当La2O3添加量为0.6%(质量分数)时,涂层主要含CaTiO_3,Ti O,β-TCP和HA等物相;通过扫描电镜观察涂层表面形貌,发现稀土氧化物La_2O_3的含量对涂层裂纹敏感性有较大影响,当稀土氧化物La_2O_3添加量为0.6%时,涂层表面较为平整,存在少量孔洞及裂纹,此时涂层硬度最大,达到HV 1971。β-tricalcium phosphate （β-TCP） and hydroxyapatite （HA） are regarded as a kind of biological materials. β-TCP and HA calcium phosphate coatings were prepared on the surface of titanium alloy （Ti6Al4V） by laser cladding technology. The bonding interface, phases and surface morphology of the coating were respectively characterized by optical microscope （OM） , X-ray diffraction （XRD） and scanning electronic microscope （SEM）. The results showed that an excellent bonding between the ceramic layer and the substrate was ensued by a strong chemical and metallurgical interface. The cladding samples consisted of four parts that were substrate, heat-affected zone, alloyed layer, and ceramic layer region. When the addition of La2O3 reached 0.6% （ mass fraction） , the coating mainly contained CaTiO3 , TiO, β-TCP and HA phases. The surface morphology of the coating was observed by SEM, and the results indicated that the La2O3 contents had a great impact on the coating crack sensitivity. When La2O3 contents was up to 0.6%, the coating surface was smooth with a small amount of holes and cracks, and the hardness value of the coating was HV 1971.

关 键 词：稀土氧化物 激光熔覆 磷酸钙陶瓷 涂层 

分 类 号：TB34[一般工业技术—材料科学与工程]