硅酸盐学报

SiO2/MgO摩尔比对MgO–Al2O3–SiO2微晶玻璃析晶和晶相转变的影响

单位：(1. 景德镇陶瓷大学材料科学与工程学院江西景德镇 333403 2. 国家日用及建筑陶瓷工程技术研究中心江西景德镇 333001)

关键词：硅镁摩尔比析晶晶相转变微晶玻璃

分类号：TQ171

出版年,卷(期):页码：2019,47(5):0-0

DOI：

摘要：

采用熔融法制备了MgO–Al2O3–SiO2 (MAS)微晶玻璃，研究了SiO2/MgO摩尔比对MAS微晶玻璃析晶和晶相转变的影响。结果表明：微晶玻璃初晶相为亚稳Mg0.6Al1.2Si1.8O6相，终晶相为堇青石相，随晶化温度升高，Mg0.6Al1.2Si1.8O6向堇青石相转变。SiO2/MgO摩尔比对微晶玻璃析晶过程影响显著，随SiO2/MgO摩尔比从2.5增加至3.6，晶相转变开始温度从1 000 ℃升高到1 150 ℃，晶相转变结束温度从1 050 ℃升高到1 180 ℃，Mg0.6Al1.2Si1.8O6相热稳定性提高，堇青石相析晶难度增大，晶相转变过程变慢。当SiO2/MgO摩尔比为3.6时，1 080 ℃晶化后的微晶玻璃Vickers硬度达到最大10.4 GPa。

MgO–Al2O3–SiO2 glass-ceramics were prepared by a melt quenching method. Effect of SiO2/MgO molar ratio on the crystallization and phase transition of MgO–Al2O3–SiO2 glass-ceramics was investigated. The results show that the initial crystalline phase of the glass-ceramics is metastable phase Mg0.6Al1.2Si1.8O6 and the final crystalline phase is cordierite. Mg0.6Al1.2Si1.8O6 phase transforms to cordierite phase when crystallization temperature increases. SiO2 / MgO molar ratio has an effect on the crystallization processes of glass-ceramics. As SiO2/MgO molar ratio varies from 2.5 to 3.6, the phase transition temperature increases from 1 000 ℃ to 1 150 ℃, and the phase transition ends from 1 050 ℃ to 1 180 ℃. The thermal stability of Mg0.6Al1.2Si1.8O6 phase enhances with increasing SiO2/MgO molar ratio, thus causing a difficulty in cordierite crystallization and slowing down the phase transition process. The Vickers hardness of the glass-ceramic reaches the maximum value of 10.4 GPa after crystallization at 1 080 ℃ when SiO2/MgO molar ratio increases to 3.6.

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