Effect of different nucleation catalysts on the crystallization of Li2O–ZnO–MgO–Al2O3–SiO2 glasses
Effect of different nucleation catalysts on the crystallization of Li2O–ZnO–MgO–Al2O3–SiO2 glasses
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DOI：
10.1016/j.ceramint.2008.05.008
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发表时间：
2009-04
影响因子：
5.2
通讯作者：
O. Al-Harbi
中科院分区：
文献类型：
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作者：
O. Al-Harbi
以当地原料为基础，制备了一系列LiZnMg铝硅酸盐玻璃，研究了TiO2、Cr2O3和zro2对玻璃结晶行为和热膨胀特性的影响。差热分析表明，TiO2>Cr2O3>ZrO2的结晶倾向依次增大。在制备的微晶玻璃中形成了Virgilite、β-锂辉石、gahnite、顽辉石和方英石。微晶玻璃样品的显微结构表现为基样中晶粒呈圆形和亚圆状生长，而含ZrO2的微晶玻璃样品中晶粒呈棒状累积生长。然而，在含有tio2和Cr2O3的微晶玻璃中，形成了相当均匀的累积生长织构。母晶玻璃的热膨胀系数对加入的成核剂（Cr2O3>TiO2>ZrO2）的类型较为敏感，变化范围为24.8×10−7 ~ 65.1×10−7°C−1，随热处理过程的变化基本不变。微晶玻璃样品的显微硬度值在763-779kg /mm2之间。
Based on local raw materials, a range of LiZnMg aluminosilicate glasses were prepared to investigate the influence of TiO2, Cr2O3,and ZrO2on the crystallization behaviour and thermal expansion characteristics. Differential thermal analysis showed that the crystallization propensity increases in the order TiO2>Cr2O3>ZrO2. Virgilite, β-spodumene ss, gahnite, enstatite and cristobalite were formed in the prepared glass-ceramics. The microstructure of glass-ceramic samples showed growths of rounded and subrounded grains in the base sample, whereas, somewhat rod-like and accumulated growths appeared in samples containing ZrO2. However, a rather homogeneous texture of accumulated growths was developed in glass-ceramics containing TiO2and Cr2O3. The coefficient of thermal expansion of parent glasses was sensitive to the type of nucleating agent added (Cr2O3>TiO2>ZrO2) varying from 24.8×10−7to 65.1×10−7°C−1being almost unchanged with the heat-treatment. The microhardness values of glass-ceramic samples were in the 763–779kg/mm2range.