Crystallization Behavior and Kinetics of Lithium Aluminosilicate Glasses with Various Li2O Contents
来源期刊：Journal Of Wuhan University Of Technology Materials Science Edition2021年第2期
论文作者：韩建军 HONG Wei 姜宏 HE Jianxiong WANG Qianchen WANG Jing GAO Wenkai
文章页码：243 - 247
摘 要：The crystallization behavior of Li2O-Al2O3-SiO2 glasses with various concentration of Li2O were investigated by DSC,XRD,and FE-SEM.The h/l-quartz s.s.is the main crystalline phase for all of the glass with the heat treatment of 720 ℃/3 h+800℃/1.5 h while the crystallinity and crystal size increase with the increase of Li2O contents.Due to the negative thermal expansion coefficient of h/l-quartz s.s.,the thermal expansion coefficient of glass-ceramics decreases with the increasing of Li2O contents.When the Li2O content is 9mol%,the near-zero CTE20-700 ℃=-0.09×10-6 ℃-1 is obtained upon the heat treatment of 720 ℃/3 h+800 ℃/1.5 h.The crystallization activation energy of the glass with 9mol% Li2O is about 351 kJ/mol,and the crystallization mechanism is volume crystallization.
韩建军1，HONG Wei1，姜宏2，HE Jianxiong3，WANG Qianchen1，WANG Jing1，GAO Wenkai1
1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology2. State Key Laboratory of Special Glass3. AVIC (Hainan) Special Glass Technology Co.Ltd.
摘 要：The crystallization behavior of Li2O-Al2O3-SiO2 glasses with various concentration of Li2O were investigated by DSC,XRD,and FE-SEM.The h/l-quartz s.s.is the main crystalline phase for all of the glass with the heat treatment of 720 ℃/3 h+800℃/1.5 h while the crystallinity and crystal size increase with the increase of Li2O contents.Due to the negative thermal expansion coefficient of h/l-quartz s.s.,the thermal expansion coefficient of glass-ceramics decreases with the increasing of Li2O contents.When the Li2O content is 9mol%,the near-zero CTE20-700 ℃=-0.09×10-6 ℃-1 is obtained upon the heat treatment of 720 ℃/3 h+800 ℃/1.5 h.The crystallization activation energy of the glass with 9mol% Li2O is about 351 kJ/mol,and the crystallization mechanism is volume crystallization.
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