| 摘要: |
| 为降低激光熔覆过程中基材与生物陶瓷涂层之间的热应力，提高涂层与基材的结合强度，选用宽带激光熔覆方法，在TC4合金表面制备一层含HA和βTCP的梯度活性生物陶瓷涂层。通过金相显微镜、扫描电子显微镜(SEM)和X射线衍射仪(XRD)对在体外模拟体液中浸泡14 d后的涂层进行形貌和相组成的研究。结果表明： 当Y2O3质量分数为0.6%，CeO2质量分数分别为0%，0.2%，0.4%和0.6%时，生物陶瓷涂层在SBF中浸泡14 d后，基材与涂层之间呈良好的冶金结合；涂层表面都有白色球状颗粒生成；且涂层当中HA的生成量各不相同。当CeO2质量分数为0%时几乎不生成HA，为0.2%时HA的生成量最大，而后随着CeO2的含量增加HA生成量减少。说明当Y2O3质量分数为0.6%，CeO2的含量为0.2%时，生物陶瓷涂层具有较好的生物活性。 |
| 关键词: 稀土氧化物 羟基磷灰石 激光熔覆 生物陶瓷涂层 |
| DOI：10.3969/j.issn.1007-9289.2014.03.007 |
| 分类号: |
| 基金项目: |
|
| Effect of Rare Earth Oxide Y2O3-CeO2 on HA in Laser Cladding Bioceramic Coating |
|
JIANG Haibing, LIU Qibin, ZHANG Lingyan
|
|
College of Materials and Metallurgy, Guizhou University, Guiyang 550025
|
| Abstract: |
| To reduce the thermal stress between the substrate and the bioceramic coating and improve the bonding strength of the coating and the substrate during the laser cladding process, a gradient of bioceramic coating with HA and βTCP was prepared on the surface of TC4 alloy by using broadband laser cladding method in the experiment. The coating morphologies and phase structural were studied by metallographic microscope, scanning electron microscope (SEM) and Xray diffraction (XRD). When the mass fraction of Y2O3 is 0.6%, and the mass fraction of CeO2 is set to 0%, 0.2%, 0.4%, and 0.6%, bioceramic coating with different rare earth contents after soaked in SBF 14 days show a good metallurgical bond between the substrate and the coating; white spherical particles from on the surface of the coating; and the formation of HA in coatings is different, and almost no HA at the content of 0%. With the mass fraction of CeO2 up to 0.2%, the formation of HA reached the maximum. However, when the content of CeO2 is 0.4%, the formation goes down gradually, and becomes the lowest at 0.6%. That is to say, when the mass fraction of Y2O3 is 0.6%, CeO2 is 0.2%, the bioceramic coating having a good bioactivity. |
| Key words: rare earth oxide hydroxyapatite (HA) laser cladding bioceramic coating |
