Al2 O3对硼硅酸盐玻璃结构和性能的影响

硼硅酸盐玻璃具有优良的抗热冲击性能和优异的光学性能。主要探讨了Al2 O3对硼硅酸盐玻璃的结构和性能的影响。通过红外光谱测试分析了Al2 O3含量不同时玻璃的结构变化,测试了玻璃的热膨胀系数,转变温度、膨胀软化温度、粘度和化学稳定性。研究结果表明：Al2 O3的加入使得玻璃结构中 BO4]减少, BO3]相应增加,从而使得玻璃结构疏松。玻璃的热膨胀系数增大,Tg 和膨胀软化点Td 降低,化学稳定性减弱；但玻璃的软化点Tf 在Al2 O3含量小于3%时,随Al2 O3含量增加有降低趋势,大于3%时随Al2 O3含量增加有增大的趋势。玻璃的高温粘度随Al2 O3的加入增大,但低温粘度减小。

Effect of Al2 O3 on Structure and Properties of Borosilicate Glass

The borosilicate glass has excellent thermal shock resistance and excellent optical performance. This paper was mainly studied on influence of Al2 O3 on the structure and properties of the borosilicate glass. The structure of borosilicate glass was analyzed by infrared spectra at different contents of Al2 O3 . The thermal expansion coefficient, transition temperature, softening temperature, viscosity and chemical stability of the glass were tested. The result show that: with the addition of Al2 O3 , the BO4 ] in the glass structure decreased, and the BO3 ] increased correspondingly, so glass structure becomes more loose;The thermal expansion coefficient of glass is increased, and the Tg and the expansion softening point Td decrease, the chemical stability is reduced; However, the softening point Tf of the glass decreases with the increase of the Al2 O3 content when the Al2 O3 content is less than 3%, and it is opposite when the Al2 O3 content is more than 3%. the high temperature viscosity of the glass increases with the addition of Al2 O3 , but the low temperature viscosity decreases.