氧化锆基纳米羟基磷灰石功能梯度生物材料的微观形貌和物相分析

Micro-morphology and phase of zirconia-based nano-hydroxyapatite functional gradient biomaterials

背景:新型氧化锆基纳米羟基磷灰石生物梯度功能陶瓷具备层间结合牢固、抗压和抗剪切强度高的机械性能,但其生物学性能尚待研究。目的:应用扫描电镜和X射线衍射仪检测氧化锆基纳米羟基磷灰石生物梯度功能陶瓷的微观形貌和物相。方法:将圆柱状氧化锆基纳米羟基磷灰石生物梯度功能陶瓷用高速手机纵向剖成薄片状试件,用细砂纸对剖面(各层相交面)进行打磨抛光,喷金后采用扫描电镜观察表面微观形貌及分层结构;将试件在玛瑙研钵体研磨成粉末状,纱布过滤后筛取粒度较小的陶瓷粉末,采用X射线衍射仪进行物相分析。结果与结论:①扫描电镜显示,梯度层间结合紧密,晶粒体积基本均一,有少量氧化锆团聚,越靠近表面层纳米羟基磷灰石含量越高,且有均匀的小孔隙;②X射线衍射仪检测显示,主要以四方相氧化锆和纳米羟基磷灰石衍射峰为主,另有少量β-磷酸三钙、α-磷酸三钙、CaZrO3和单斜相氧化锆晶体;③结果间接表明,表层纳米羟基磷灰石在梯度层过渡下与氧化锆基体层结合牢固,氧化锆基纳米羟基磷灰石梯度功能生物材料是一种力学和生物学性能优良的陶瓷材料。

BACKGROUND: The successfully prepared zirconia-based nano-hydroxyapatite functional gradient bioceramics has mechanical properties of strong interlayer bonding, high compressive and shear strength, but its biological properties are yet to be studied.OBJECTIVE: To detect the micro-morphology and phase of the zirconia-based nano-hydroxyapatite functional gradient bioceramics using scanning electron microscope and X-ray diffractometer.METHODS: Cylindrical zirconia-based nano-hydroxyapatite functional gradient bioceramics were longitudinally sectioned into thin-shaped specimens with turbine handpieces. The profile(intersections of layers) was polished with sandpaper. Its surface micro-morphology and layered structure were observed with a scanning electron microscope after spraying gold. The test piece was ground into a powder in an agate mortar and filtered with gauze. Ceramic powder was sieved with smaller particle size for phase analysis with X-ray diffractometer.RESULTS AND CONCLUSION:(1) Scanning electron microscopy showed that the gradient layers were tightly bound. The grain volume was basically uniform. There was a small amount of ZrO2 agglomeration. The closer to the surface layer, the higher the nHA content and the uniform small pores.(2) The X-ray diffractometer detected mainly the tetragonal phase ZrO2 and nHA diffraction peaks, and a small amount of β-TCP, α-TCP, CaZrO3 and a small amount of monoclinic phase ZrO2 crystal.(3) The research results indirectly indicate that the surface layer nHA is firmly bonded to the ZrO2 matrix layer under the transition of the gradient layer. ZrO2 based nHA functional gradient biomaterial is a ceramic material with excellent mechanical and biological properties.