【摘要】 以44CaO-43P2O5-10Na2O-3B2O3为玻璃体系,通过高温熔融法制备基质玻璃,并进行相应的热处理,可获得由基质玻璃和析晶相组成的玻璃陶瓷。用DSC,XRD,SEM和EDS对玻璃的成核、析晶,相组成和微观结构进行分析。结果表明:B的引入将促进玻璃的分相,富B相在热处理过程中产生析晶;同时,热处理也引起基质玻璃的进一步析晶。在700℃热处理4h,材料由残余玻璃基质、Ca(PO3)2晶粒和微量CaNa2PO4组成。试样在磷基缓冲溶液(PBS)中进行降解实验,11d时Ca2+浓度达到峰值17.2μg/g,并有大量类羟基磷灰石形成,随后Ca2+浓度变化放缓。更多还原

【Abstract】 A glass ceramic in the system of CaO-P2O5-B2O3-Na2O (CPBN),which consisted of matrix glass and crystal grains,was obtained by melt-quenching method followed by heat treatment. The crystallization from glass matrix and microstructure were analyzed by DSC,XRD,SEM and EDS. The experimental results showed that the addition of B2O3 induced phase separation of the glass into a phosphate glass matrix and boron rich island-like droplets prior to crystallization. More importantly,heat-treatment would promote further crystallization. XRD taken from samples heat treated at 700 ℃ for 4 h,revealed that the composition included the residual glass matrix,major phase Ca(PO3)2 and trace phase CaNa2PO4. Vitro test performed in phosphate based buffer solution showed that a higher Ca2+ concentration was achieved,up to 17.2 μg/g after 11 days’ immersion and hydroxyapatite deposited on the surface of the samples,and then a decrease was observed until 26 d.更多还原