作　　者： ; ; ; ;

机构地区： 中南大学材料科学与工程学院粉末冶金国家重点实验室

出　　处： 《中南大学学报（自然科学版）》 2006年第6期1025-1030,共6页

摘　　要： 采用高温熔铸法制备可加工生物活性云母/氟磷灰石玻璃陶瓷;用X射线衍射(XRD)、扫描电镜(SEM/EDS)和傅里叶变换红外(FTIR)光谱分析等手段对材料的相组成和微观形貌进行研究,测定材料的抗弯强度、硬度和断裂韧性等力学性能;采用体外模拟体液(SBF)浸泡法测试材料的生物活性。研究结果表明:氟磷灰石相呈针状,与人体骨和牙齿的磷灰石形貌相似,有利于提高材料的生物活性和生物相容性;氟磷灰石的形成是材料被迅速加热至高温进行热处理,使磷灰石以螺旋位错生长机制沿c轴晶化长大所致;经热处理获得的材料具有优良的力学性能,基本满足骨科和齿科用生物材料的性能要求;材料在体外模拟体液中浸泡3 d后,样品表面已有磷灰石层生成,表明该材料具有较高的生物活性。 Machinable bioactive glass-ceramics containing mica and fluorapatite were prepared by high-temperature melting. The glass-ceramics were analyzed by means of X-ray diffractometry （XRD）, scanning electron microscopy with energy dispersive spectrometer （SEM/EDS） and Fourier transform infrared reflection spectrometry（FTIR）. The bending strength, hardness and fracture toughness of the materials were measured. To evaluate the bioactivity of the glass-ceramics, the specimens were soaked in the simulated body fluid （SBF）. The results indicate that fluorapatire shows needle-like microstructure, which is similar to that in human bone and teeth. The formation of needle-like fluorapatite is related to the heat treatment procedure, which results in needie-like fluorapatite crystals by accelerating one-dimension growth along the c-axis through the screw dislocation growth mechanism. The mechanical properties of the glass-ceramics are close to those of the human bone and teeth. The bioactivity test results show that apatite layer is precipitated on the materials surface after 3 d immersion in SBF, which indicates the glass-ceramics have a good bioactivity.

关 键 词： 玻璃陶瓷 显微结构 生物活性 云母 氟磷灰石

领　　域： [化学工程] [化学工程]