摘要
采用等离子喷涂技术 ,在Ti-6Al-4V基体上制备了硅灰石涂层 .利用SEM和XRD分析技术对涂层的形貌、结构和相组成进行了研究 .按ASTMC -6 33标准对涂层的结合强度也进行了测试 .将涂层试样浸泡于模拟体液中以评估其生物活性 .利用SEM及配备的能谱仪(EDS)、XRD和IR对浸泡后涂层表面产物的形貌、结构和相组成等进行了分析 .结果表明 :等离子喷涂硅灰石涂层具有粗糙的表面和层状结构 ,涂层内部存在一些气孔和微裂纹 .涂层的主晶相是三斜晶系硅灰石 ,也存在玻璃相 .硅灰石涂层和Ti-6Al-4V基体热膨胀系数相近 ,因此涂层和Ti-6Al-4V基体具有较高的结合强度 ,其值可达约 39MPa .模拟体液浸泡试验显示 ,硅灰石涂层表面能形成含有碳酸根的羟基磷灰石层 ,这表明硅灰石涂层会有良好的生物活性 。
Wollastonite coating deposited on Ti-6Al-4V substrate was prepared using plasma spraying technology. The tensile bonding strength of the coating was measured with ASTM C-633 methods. Simulated body fluid (SBF) tests were carried out to evaluate the bioactivity of the coating. Scan electron microscopy (SEM), X-ray diffraction (XRD) and infrared (IR) spectroscopy were used to investigate the surface morphology, microstructure and phase compositions of the coating before and after it was soaked in SBF for various times. The results indicate that the plasma sprayed wollastonite coating has a rough surface and a lamellar structure including some pores and microcracks. The primary crystalline phase of the as-sprayed coating is triclinic wollastonite. The abundant glassy phase is also discovered in the coating. The bonding strength of the wollastonite coating amounts to about 39 MPa, which is thought to result from the fact that the thermal expansion coefficient of wollastonite coating comes close to that of the Ti-6Al-4V substrate. In SBF test, the surface of the coating is covered by carbonate-containing hydroxyapatite, which indicates that wollastonite coatings could have good bioactivity.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2002年第1期20-25,共6页
Journal of The Chinese Ceramic Society
基金
国家重点基础研究项目 (G19990 6 470 6 )
国家自然科学基金资助项目 ( 5 0 10 2 0 0 8)
