【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
【机 构】
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State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan
【出 处】
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武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
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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