采用溶胶凝胶法,以羟基磷灰石前躯体为成核剂,制备CaO-P_2O_5-SrO-MgO-Na_2O体系玻璃陶瓷,并控制其析晶相的种类、含量以及晶粒大小.结果表明:在溶胶凝胶法制备CaO-P_2O_5-SrO-MgO-Na_2O玻璃陶瓷的过程中,引入羟基磷灰石前躯体作为成核剂,可有效降低成核与析晶温度.700 ℃热处理后的试样由基质玻璃、主晶相Ca_4P_6O_(19) ,微量的β-Ca_2P_2O_7和(Ca,Mg)_3(PO_4)_2组成.析晶相镶嵌在残余玻璃基质中,且分布较均匀.烧结体内部有较多微孔,该结构有利于体内离子扩散,提高材料的生物活性.通过调整前驱体含量和热处理温度,可控制析晶相/基质玻璃比率,调控材料的微观结构,获得具有Ca_4P_6O_(19)镶嵌结构的玻璃陶瓷,从而调控材料的生物降解特性.
A kind of porous glass ceramics in the system of CaO-P_2O_5-SrO-MgO-Na_2O, which used nano-hydroxyapatite as precursor, was obtained by sol-gel method, and the crystallization phases, grain sizes and ratio of crystal to glass were controlled by adjusting the content of hydroxyaoatite precursor and the thermal treatment temperature. The experimental results show that nano-hydroxyapatite not only improves the ratio of calcium to phosphate in the system, but also reduces the temperature of nucleating and crystallization effectively. XRD taken from samples heat treated at 700 ℃, reveal that the composition include the residual glass matrix, major phase Ca_4P_6O_(19), trace β-Ca_2P_2O_7 and (Ca,Mg)_3(PO_4)_2. The obtained porous structure can promote the ion diffusion of the body fluid and improve the biological activity of this sintering sample.
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