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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effect of heat-treatment condition on crystallization behavior and thermal expansion coefficient of Li2O-ZnO-Al2O3-SiO2-P2O5 glass-ceramics
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Effect of heat-treatment condition on crystallization behavior and thermal expansion coefficient of Li2O-ZnO-Al2O3-SiO2-P2O5 glass-ceramics

机译：热处理条件对Li2O-ZnO-Al2O3-SiO2-P2O5玻璃陶瓷结晶行为和热膨胀系数的影响

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Utilizing P-2-O-5 as nucleation agent, a Li2O-ZnO-Al2O3-SiO2 glass was prepared by conventional melt quenching technique and subsequently converted to glass-ceramics with different crystal phases. During the processing, two-step heat-treatments including nucleation and crystallization were adopted. The effects of heat-treatment on the crystal type, the microstructure and the thermal expansion behavior of the glass-ceramics were studied by means of differential scanning calorimetry, X-ray powder diffraction analysis, scanning electron microscopy and thermal expansion coefficient tests. It was shown that the crystallization of beta(')(parallel to)-Li2ZnSiO4 occurred after the glass was treated at 580 degrees C. As the temperature increased from 580 degrees C to 630 degrees C, cristobalite and beta(')(parallel to)-Li2ZnSiO4 were identified as main and second crystal phases, respectively, in the glass-ceramic. An increase in the temperature to 700 degrees C, the beta-quartz solid solution in the glass-ceramic accompanied by a decrease in cristobalite content. The transformation from P1-LiZnSi04 to gamma(0)-Li2ZnSiO4 took place from 700 degrees C to 750 degrees C. The resulting crystallization phases in the glass-ceramics obtained at the temperature higher than 750 degrees C were beta-quartz solid solution and gamma(0)-Li2ZnSiO4. The glass-ceramics containing beta(')(parallel to)-Li2ZnSiO4 or beta-quartz solid solution crystal phase possessed a microstructure formed by the development of dendritic crystals. The thermal expansion coefficient of the glass-ceramics varied from 36.7 to 123.8 x 10(-7) degrees C-1 in the temperature range of 20-400 degrees C, this precise value is dependent on the type and the proportion of the crystalline phases presented. (c) 2007 Elsevier B.V. All rights reserved.
机译：以P-2-O-5为成核剂，通过常规的熔融淬火技术制备了Li2O-ZnO-Al2O3-SiO2玻璃，并随后转化为具有不同晶相的玻璃陶瓷。在加工过程中，采用了成核和结晶两步热处理。通过差示扫描量热法，X射线粉末衍射分析，扫描电子显微镜和热膨胀系数试验研究了热处理对玻璃陶瓷的晶体类型，显微结构和热膨胀行为的影响。结果表明，在580℃下对玻璃进行处理后，β（'）（平行于）-Li2ZnSiO4发生了结晶。随着温度从580℃升高至630摄氏度，方石英和β（'）（平行于）-Li 2 ZnSiO 4被确定为玻璃陶瓷中的主晶相和第二晶相。温度升高到700摄氏度，玻璃陶瓷中的β-石英固溶体伴随方石英含量的降低。从P1-LiZnSiO4到γ（0）-Li2ZnSiO4的转变是在700摄氏度到750摄氏度之间进行的。在高于750摄氏度的温度下获得的玻璃陶瓷中，结晶相为β-石英固溶体和γ （0）-Li 2 ZnSiO 4。包含β（'）（平行）-Li2ZnSiO4或β-石英固溶体晶相的玻璃陶瓷具有通过形成树枝状晶体而形成的微结构。在20-400摄氏度的温度范围内，玻璃陶瓷的热膨胀系数在36.7至123.8 x 10（-7）摄氏度之间变化，该精确值取决于晶相的类型和比例呈现。 （c）2007 Elsevier B.V.保留所有权利。

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