期刊论文

Effect of CaB_6 on Microstructure and Biological Properties of Bioceramic Coatings by Laser Cladding

中文

材料导报

1005-023X

2020

34

10

10030-10034

10.11896/cldb.19100044

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

本校为第一机构

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...

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 laye...