Incorporation of B₂O₃ in CaO-SiO₂-P₂O₅ bioactive glass system for improving strength of low-temperature co-fired porous glass ceramics

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• 作者：Xianyan Yang^a ; Lei Zhang^b ; Xiaoyi Chen^a ; Xiaoliang Sun^b ; Guojing Yang^b ; Xingzhong Guo^a ; Hui Yang^a ; Changyou Gao^a ; Zhongru Gou^a ; ^{zhrgou@zju.edu.cn}
• 关键词：Boron doping ; Low melting temperature ; Degradation rate ; Bioactive glass ceramics ; Sol&ndash ; gel
• 刊名：Journal of Non-Crystalline Solids
• 出版年：2012
• 期刊代码：50_00223093
• 类别：ms
• 出版时间：1 May, 2012
• 卷：358
• 期：9
• 页码：1171-1179
• 文件大小：2253 K

摘要

Bioactive glass ceramics (BGCs) have different rates of biodegradation and mechanical properties depending on their chemical compositions and sintering temperatures. The present study was aimed to develop the boron-rich, phosphorus-low CaO-SiO₂-P₂O₅-B₂O₃ bioactive glasses (BG-B_x, X = 0, 10, 20) potentially for improving the mechanical properties of BGCs via low-temperature co-fired process. The B₂O₃-free BG-B₀ shrunk well at ~ 726 掳C and melted at over 1050 掳C, while the onset shrinking and melting temperatures of the 20 mol%B₂O₃-doped BG-B₂₀ was lowered to ~ 648 掳C and ~ 952 掳C, respectively. The BG-B₂₀ thermally treated at 850-950 掳C was transformed into wollastonite and calcium borate, and crystallization decreased the kinetics but did not inhibit the development of hydroxyapatite on their powder and disc surface when immersed in simulated body fluid. The in vitro degradation in Tris buffer confirmed that the degradation rate markedly increased with increasing boron content in BG-B_x. The compressive strength and flexural strength of the 10%BG-B₂₀-reinforced 45S5 porous BGC sintered at 850 掳C was nearly four times than that of 45S5 porous constructs. These studies suggest that the boron-rich, phosphorus-low CaO-SiO₂-P₂O₅-B₂O₃ system is a promising biomaterial and potential low temperature co-fired aid for improving the mechanical and biological properties of porous BGCs.