Taira M, Okazaki M, Takahashi J
Department of Dental Materials Science and Technology, Osaka University Faculty of Dentistry, Japan.
Dent Mater J. 1997 Dec;16(2):117-26. doi: 10.4012/dmj.16.117.
Glass-ceramic powders with the oxide batch formulation 50wt%SiO2, 20wt%P2O5 and 30wt%CaO were prepared by the sol-gel process using tetraethoxysilane, calcium nitrate and phosphoric acid as raw materials. The obtained gels and powders were characterized by TG-DTA thermal analysis, FTIR analyses and XRD measurements. The results indicated that (1) heating to more than 600 degrees C brought about elimination of -OC2H5 side chains from gels, and formation of a SiO2-based glass network, (2) crystallization such as Ca3(PO4)2 notably occurred in the SiO2-based glass matrix when heated to more than 900 degrees C, (3) -OH groups existed on SiO2-based glass-ceramic surfaces in the temperature region less than 900 degrees C, and (4) the melting point of this composition was more than 1400 degrees C. This study suggests that sol-gel-derived SiO2-based glass-ceramic powder containing P and Ca might be useful as bioactive implant materials.
采用溶胶 - 凝胶法，以四乙氧基硅烷、硝酸钙和磷酸为原料，制备了氧化物配料配方为50wt%SiO₂、20wt%P₂O₅和30wt%CaO的微晶玻璃粉末。通过TG - DTA热分析、FTIR分析和XRD测量对所得凝胶和粉末进行了表征。结果表明：(1)加热至600℃以上会使凝胶中的 - OC₂H₅侧链消除，并形成基于SiO₂的玻璃网络；(2)加热至900℃以上时，诸如Ca₃(PO₄)₂之类的晶化明显发生在基于SiO₂的玻璃基体中；(3)在温度低于900℃的区域，基于SiO₂的微晶玻璃表面存在 - OH基团；(4)该组合物的熔点超过1400℃。本研究表明，溶胶 - 凝胶法制备的含P和Ca的基于SiO₂的微晶玻璃粉末可能作为生物活性植入材料有用。
