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    隋普辉, 陆雷, 武相萍, 吴国芳. 晶化温度对Li2O-ZnO-Al2O3-SiO2微晶玻璃物相组成和热膨胀系数的影响[J]. 机械工程材料, 2009, 33(5): 14-17.
    引用本文: 隋普辉, 陆雷, 武相萍, 吴国芳. 晶化温度对Li2O-ZnO-Al2O3-SiO2微晶玻璃物相组成和热膨胀系数的影响[J]. 机械工程材料, 2009, 33(5): 14-17.
    shu
    SUI Pu-hui, LU Lei, WU Xiang-ping, WU Guo-fang. Effect of Crystallization Temperature on Phase Composition and Thermal Expansion Coefficient of Li2O-ZnO-Al2O3-SiO2 Glass-ceramics[J]. Materials and Mechanical Engineering, 2009, 33(5): 14-17.
    Citation: SUI Pu-hui, LU Lei, WU Xiang-ping, WU Guo-fang. Effect of Crystallization Temperature on Phase Composition and Thermal Expansion Coefficient of Li2O-ZnO-Al2O3-SiO2 Glass-ceramics[J]. Materials and Mechanical Engineering, 2009, 33(5): 14-17.
    shu

    晶化温度对Li2O-ZnO-Al2O3-SiO2微晶玻璃物相组成和热膨胀系数的影响

    Effect of Crystallization Temperature on Phase Composition and Thermal Expansion Coefficient of Li2O-ZnO-Al2O3-SiO2 Glass-ceramics

      摘要
    • 摘要: 采用DTA、XRD、SEM、热膨胀仪等仪器研究了晶化温度对Li2O-ZnO-Al2O3-SiO2微晶玻璃的物相组成以及热膨胀系数的影响.结果表明:在晶化温度为625 ℃时,微晶玻璃中析出βⅡ-Li2ZnSiO4晶相,650 ℃时又析出少量方石英晶相;随着晶化温度上升,方石英相逐渐转化为β-石英固溶体,至750 ℃时βⅡ-Li2ZnSiO4晶相开始转化为γ0-Li2ZnSiO4晶相;当温度高于800 ℃后,微晶玻璃中主要含有β-石英固溶体和γ0-Li2ZnSiO4两种晶相,并且晶粒尺寸变大;不同晶化温度下制得微晶玻璃的热膨胀系数在(72~119)×10-7 ℃-1(20~500 ℃)之间,随着晶化温度的升高,试样的热膨胀系数先升高而后下降,然后趋于平稳,在650 ℃达到最大.

       

      Abstract: The effect of crystallization temperature on the phase composition and thermal expansion coefficient(TEC) of Li2O-ZnO-Al2O3-SiO2(LZAS) glass-ceramic was studied by means of DTA,XRD,SEM and thermal analyzer methods.The results show that the crystallization of βⅡ-Li2ZnSiO4 occurred after the glass was treated at 625 ℃,and cristobalite crystallite formed at 650 ℃;then β-quartz solid solutions replaced cristobalite crystallite gradually with the temperature increasing.The transformation from βⅡ-Li2ZnSiO4 to γ0-Li2ZnSiO4 took place at 750 ℃.The crystallization phases in the glass-ceramics obtained at the temperature higher than 800 ℃ were β-quartz solid solutions and γ0-Li2ZnSiO4,and the size of crystal particles increased gradually.The thermal expansion coefficient of the glass-ceramics which formed at different crystallization temperatures varied from 72×10-7 ℃-1 to 119×10-7 ℃-1 in the temperature range of 20-500 ℃,which increased first and reached to the maxinum at 650 ℃,then decreased and changed to be steady.

       

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