以44CaO-43P_2O_5-10Na_2O-3B_2O_3 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4 h,材料由残余玻璃基质、Ca(PO_3)_2晶粒和微量CaNa_2PO_4组成.试样在磷基缓冲溶液(PBS)中进行降解实验,11d时Ca~(2+)浓度达到峰值17.2 μg/g,并有大量类羟基磷灰石形成,随后Ca~(2+)浓度变化放缓.
A glass ceramic in the system of CaO-P_2O_5-B_2O_3-Na_2O (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 B_2O_3 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(PO_3)_2 and trace phase CaNa_2PO_4. Vitro test performed in phosphate based buffer solution showed that a higher Ca~(2+) 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.
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