羟基磷灰石-玻璃复合陶瓷的微波烧结

Microwave Sintering of Hydroxyapatite-Glass Composite Ceramics

采用沉淀法合成羟基磷灰石粉体,将R2OAl2O3B2O3SiO3体系玻璃粉按一定的比例与HAP粉混合,采用等静压成型和干压法成型2种成型方法对羟基磷灰石玻璃复合粉体成型,分别在1150℃、1200℃、1250℃下微波烧结。利用XRD、IR和SEM等手段对烧结过程中的相变和陶瓷显微结构进行研究,结果表明随着烧结温度的升高,羟基磷灰石玻璃复合陶瓷的结构逐渐致密;烧结温度低于1200℃时主晶相没有发生明显变化,当烧结温度达到1250℃时等静压成型的样品中HAP发生了明显的分解;等静压成型的羟基磷灰石—玻璃复合陶瓷的致密度优于普通干压法成型的陶瓷。

In this paper the microwave sintering of hydroxyapatite-glass （HAP-G） ceramics was studied. Hydroxyapatite was synthesized by chemical precipitation method. The compound powder of R2O-Al2O3- B2O3-SiO3 system glass powder with hydroxyapatite mixed in definite proportion was molded by two different methods, dry pressing method and isostatic pressing method, and sintered by the microwave at 1150℃, 1200℃, 1250℃ respectively. The chemical reaction during sintering process and the microstructures of the ceramics were studied by XRD, IR and SEM. The results of test show that the structures of samples become compact gradually along with the increase of sintering temperature, but the main crystalline phase in the ceramics did not change remarkably when sintering temperature is lower than 1200℃, and HAP in HAP-G molded by isostatic pressing method will decompose when sintering temperature is higher than 1250℃. The density of sample molded by isostatic pressing method was better than that of the ceramics molded by dry pressing method.