云母微晶玻璃等温转变动力学的研究

摘要/Abstract

摘要： 本文对以TiO₂为晶核剂的云母微晶玻璃等温析品转变进行了研究，发现玻璃的差热分析（DTA）曲线上出现了两个析晶放热峰，X光衍射分析（XRD）表明，在这两个析晶峰温度下从玻璃中分别析出了钛酸镁（MgTi₂O₅）和云母（KMg₃AlSi₃O₁₀F₂）晶体.用差热分析测定了玻璃等温析晶活化能和晶体的生长指数．玻璃析出钛酸镁和云母的活化能分别为242kJ／mol和265kJ／mol．云母晶体以二维方式生长，生长过程受界面过程控制.

关键词: 云母, 玻璃, 析晶, 动力学, 分相, 生长机制

Abstract: The isothermal crystallization kinetics of mica-containing glass ceramics with addition of TiO2 asnucleation agent was investigated by XRD, SEM and DTA. Two distinct crystallization exotherm peaksin the DTA curve were observed and resolved corresponding to the initial formation of MgTi₂O₅,followed by the formation of KMg₃AlSi₃O₁₀F₂, confirmed by X-ray diffeaction analysis (XRD). By usingJohnson-Mehl-Avrami equation, the activation energics for precipitation of MgTi₂O₅ and mica crystalswere enaluated and the crystallization mechanism of mica was analyzed. The results indicated that the growth of KMg₃AlSi₃O₁₀F₂isa two-dimensional process, controlled by the crystal-glass in terface reaction. The average values of activation energies are 242kJ/mol and 265kJ/mol corresponding to that of MgTi₂O₅ and mica crystalized out of the glass, respectively.

Key words: mica, glass, crystalization, kinetics, phase separation, growth mechanism

程慷果,万菊林,梁开明. 云母微晶玻璃等温转变动力学的研究[J]. 无机材料学报.

CHENG Kangguo,WAN Julin,LIANG Kaiming. Study on Isothermal Crystallization Kinetics of Mica Glass Ceramics[J]. Journal of Inorganic Materials.

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