CaB6对激光熔覆生物陶瓷涂层组织和生物学性能的影响  

Effect of CaB6 on Microstructure and Biological Properties of Bioceramic Coatings by Laser Cladding

作　　者：施佳鑫 朱卫华[2,3] 朱红梅[1,3] 陈志勇 刘晋京[1] 史新灵 王新林 SHI Jiaxin;ZHU Weihua;ZHU Hongmei;CHEN Zhiyong;LIU Jinjing;SHI Xinling;WANG Xinlin(College of Mechanical Engineering,University of South China,Hengyang 421001,China;College of Electrical Engineering,University of South China,Hengyang 421001,China;Ultra-fast Wiener Technology and Laser Advanced Manufacturing Hunan Provincial Key Laboratory,University of South China,Hengyang 421001,China)

机构地区：[1]南华大学机械工程学院,衡阳421001 [2]南华大学电气工程学院,衡阳421001 [3]南华大学超快维纳技术与激光先进制造湖南省重点实验室,衡阳421001

出　　处：《材料导报》2020年第10期10030-10034,共5页Materials Reports

基　　金：湖南省自然科学基金(2015JJ3109);湖南省教育厅科学研究项目(16C1375)。

摘　　要：为了提高医用钛合金表面激光熔覆羟基磷灰石(HA)涂层的植入稳定性和生物活性,将HA与CaB 6粉末充分混合,采用激光熔覆工艺制备了含硼元素的生物陶瓷涂层。通过X射线衍射仪(XRD)、扫描电镜(SEM)、电化学腐蚀和体外模拟体液(SBF)浸泡实验,对涂层的物相组成、组织形貌、耐腐蚀性和生物活性进行了研究。结果表明,添加CaB 6后熔覆层中产生了物相B 2O 3和CaB 2O 4,同时熔覆层中部组织呈现有序分布的二次枝晶;腐蚀电位下降了294.46 mV,电流密度是未添加CaB 6的4.28倍;在体外SBF浸没实验中,添加CaB 6后,涂层表面沉积的磷灰石均匀分布,浸泡7 d后,形成的矿化磷灰石沉积量最大,涂层表现出较强的矿化作用。CaB 6的添加可以细化晶粒,显著提升生物陶瓷涂层的耐腐蚀性,加强涂层表面的矿化能力。To improve the implantation stability and biological activity of the hydroxyapatite(HA)coating on the surface of medical titanium alloy,a boron-containing CaP bioceramic coating was prepared by laser cladding method.XRD,SEM,electrochemical etching and in SBF immersion experiments were used to characterize the phase composition,microstructure,corrosion resistance and bioactivity of the coating.The results show that the phase B 2O 3 and CaB 2O 4 are produced in the cladding layer after the addition of CaB 6.CaB 6exacerbates the decomposition of HA,and the central tissue of the cladding layer presents an ordered distribution of secondary dendrites.After adding CaB 6,the corrosion potential decreased by 294.46 mV,and the current density was 4.28 times that of CaB 6.In the vitro SBF immersion experiment,after adding CaB 6,the apatite deposited on the surface of the coating is uniformly distributed.After seven days of immersion,the formation of mineralized apatite is the largest,and the coating exhibits strong mineralization.The addition of CaB 6 can refine the grains,significantly improve the corrosion resistance of bioceramic coatings,and strengthen the surface mineralization ability of the coating.

关 键 词：激光熔覆 六硼化钙(CaB6) 生物陶瓷涂层 耐腐蚀性能 生物活性 

分 类 号：TG178[金属学及工艺—金属表面处理]