【摘要】 采用熔融-淬冷法制备了不同（Al₂O₃+P₂O₅）含量的碱铝硅酸盐玻璃,通过拉曼光谱、X射线衍射光谱、扫描电镜研究了其结构特征和析晶性能。发现随着（Al₂O₃+P₂O₅）含量减少,玻璃中Na₂O含量增加,玻璃化转变温度从685℃降低到622℃,当减少至摩尔分数为22%时,出现析晶峰且起始析晶温度降低。拉曼光谱表明Q■对应的拉曼峰强度变低且逐渐向低波数方向移动,说明Na₂O作为网络修饰体使硅酸盐玻璃结构逐步解聚,玻璃的析晶能力逐渐增强。结果表明:当（Al₂O₃+P₂O₅）摩尔分数为22%时热处理后的样品存在晶型转变,700℃热处理时以NaAlSiO₄霞石晶体为主,900℃时转变为以Na_6.8Al_6.3Si_9.7O₃₂霞石晶体为主。当（Al₂O₃+P₂O₅）的摩尔分数为21%和20%时,热处理后的样品能稳定析出Na₃PO₄和Na_6.8Al_6.3Si_9.7O₃₂晶体。热处理后的样品析出了耐酸侵蚀性较差的富磷相和Na₃PO₄晶体,导致化学稳定性变差。更多还原

【Abstract】 Alkali-aluminosilicate glasses with different（Al₂O₃+P₂O₅） concentrations were prepared by the melting-quenching method, and their structural characteristics and crystallization behavior were studied by Raman spectroscopy, X-ray diffraction spectroscopy, and scanning electron microscopy. It is found that as the concentration of（Al₂O₃+P₂O₅） decreases, the concentration of Na₂O increases, resulting in the glass transition temperature decreases from 685 ℃ to 622 ℃. When the（Al₂O₃+P₂O₅） concentration decreases to 22%（mole fraction）, a crystallization peak appears and the onset crystallization temperature gradually decreases. The intensity of the Raman vibration band corresponding to Q■ becomes lower and gradually shifts towards low frequency, indicating that the Na₂O as a network modifier gradually depolymerizes the structure of silicate glass and enhances the crystallization ability of the glass. The results show that there is a crystalline transformation after heat treatment when the concentration of（Al₂O₃+P₂O₅） is 22%（mole fraction）. The main precipitation crystals are NaAlSiO₄ nepheline at 700 ℃ for 2 h while it transforms to Na_6.8Al_6.3Si_9.7O₃₂ nepheline crystals at 900 ℃ for 2 h. When the concentration of（Al₂O₃+P₂O₅） is 21% and 20%（mole fraction）, Na₃PO₄ and Na_6.8Al_6.3Si_9.7O₃₂ crystals are precipitated after heat treatment. After heat treatment, phosphorus-rich phase and Na₃PO₄ crystals with poor acid corrosion resistance are precipitated, resulting in poor chemical stability.更多还原