High Temperature Resistance of High Alkali Auminosilicate Glasses
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摘要: 研究了高碱铝硅酸盐玻璃熔体在600~1 625℃的高温电阻特性.结果表明:在900~1 625℃时玻璃熔体的电阻率随着n(K2O)/n(Na2O)提高呈现出增大趋势,玻璃电阻率随着温度变化符合Arrhenius方程,反映出玻璃熔体的电导率是受离子迁移控制的.研究电阻-温度依存性关系发现,玻璃的电导行为在900℃附近时出现了转变,表明玻璃电阻率受玻璃网络结构聚集度和网络外体离子结合力的影响,大于900℃时电导主要受碱金属离子的扩散机制控制,活化能为50~65 kJ/mol;在600~900℃低温区电导能力较弱,主要受碱金属离子的迁移机制所控制,活化能为100~120 kJ/mol.Abstract: High temperature resistivity of high alkali aluminoilicate glasses at 600-1 625 ℃ is investigated in this paper.Experimental results show that the resistivity of glass melts increases with the K2O/Na2O ratio in an temperature range of 900-1 625 ℃.The temperature dependence agrees well with the Arrhenius law,which implies that the resistivity of the glass melt is controlled by ion migration.The investigation of the temperature dependent resistivity of high alkali aluminosilicate glasses show that the electric conductivity behavior of glass has a transition near 900 ℃,which indicates that the aggregation degree of glass network structure and the binding force of modifier ions have an effect on glass electrical resistivity,and the diffusion of alkali metal ions attributes to the electric conductivity above 900 ℃,the activation energy is between 50-65 kJ/mol;while the glass conductivity capacity is poor at 600-900 ℃,which is controlled by migration mechanisms of alkali metal ions,and the activation energy is 100-120 kJ/mol.
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