摘要
铝硅酸盐玻璃具有高强度、硬度、弹性模量及良好的热学和化学稳定性,使其应用领域也越来越广泛。利用核磁共振(NMR)^(29)Si谱和^(27)Al谱,研究了不同Al/Si比MgO-Al_(2)O_(3)-SiO_(2)系玻璃的结构。研究表明,MgO-Al_(2)O_(3)-SiO_(2)系玻璃网络由硅氧网络和铝氧网络交替连接而成。由于游离氧不充足,大部分Al^(3+)都以5配位的形式存在于玻璃网络之外,只有25.0%~29.8%的Al^(3+)以[AlO_(4)]的形式存在,[AlO_(6)]的Al^(3+)其所占比例更少。随着Al/Si比例的增大,硅氧网络在镁铝硅玻璃结构中的聚合程度,呈现出了先增加而后降低的变化形式。在玻璃组分中Al与Si之间的比例为0.81时,由硅氧所形成的网络聚合程度达到极大值点。同时铝氧网络在玻璃结构中的聚合程度却呈现出了随Al/Si比的增加先是逐渐降低,在Al/Si=0.81时出现最小值。由[SiO_(4)]与[AlO_(4)]共同构成的整个玻璃网络的聚合程度呈现逐步降低的趋势。
The structures of MgO-AlO-SiOglasses with different Al/Si ratios were investigated by nuclear magnetic resonance(NMR)includingSi andAl spectra.NMR analysis indicated that MgO-AlO-SiOglass network consisted of silicon oxygen network and aluminum oxygen network.Due to the lack of free oxygen,Most Alexisted outside the glass network in the form of 5 coordination,only 25.0%~29.8%of Alexisted in the form of 4 coordination,and 6 coordinate Alhad less proportion.With the increase of Al/Si ratio,the polymerization degree of Si/Si network in glass structure shows a law of first increasing and then decreasing.The polymerization degree of Si/Si network reaches the maximum point at Al/Si=0.81.The polymerization degree of alumina network decreased with Al/Si ratio,reached the lowest in Al/Si=0.81.However,the polymerization degree of the whole glass network composed of[SiO]and[AlO]decreases gradually.
作者
杨虎
何峰
谢峻林
叶时迁
YANG Hu;HE Feng;XIE Jun-lin;YE Shi-qian(School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)
出处
《武汉理工大学学报》
CAS
2022年第6期26-31,共6页
Journal of Wuhan University of Technology
