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无机材料学报

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Cr2O3的添加对MgO-Al2O3-SiO2-TiO2系统微晶玻璃析晶行为的影响

董继鹏;陈玮;罗澜   

  1. 中国科学院上海硅酸盐研究所, 上海 200050
  • 收稿日期:2005-11-14 修回日期:2006-01-18 出版日期:2006-09-20 网络出版日期:2006-09-20

Effects of Cr2O3 Additive on Crystallization Behavior of MgO-Al2O3-SiO2-TiO2 Glass-ceramics

DONG Ji-Peng;CHEN Wei;LUO Lan   

  1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2005-11-14 Revised:2006-01-18 Published:2006-09-20 Online:2006-09-20

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摘要： 利用DTA、XRD、SEM和TEM等实验手段, 研究了 Cr2O3的添加对MgO-Al2O3-SiO2-TiO2系统微晶玻璃析晶行为的影响. 同时, 通过Ozawa和Kissinger方法计算出系统中α-堇青石的析晶活化能E. 研究结果表明, 少量Cr2O3的添加并不改变MgO-Al2O3-SiO2-TiO2系统玻璃析出的晶相类型, 但是提高了玻璃转化温度Tg, 降低了α-堇青石的析晶活化能. 由于析晶活化能的降低, 促进了α-堇青石的析出, 最终获得了一种有实用价值的微波介质材料. 该材料在微波频率下(10GHz)的相对介电常数约5.5, 介电损耗<7×10-4.

关键词: 堇青石, 微晶玻璃, 析晶活化能, 介电性能

Abstract:

The crystallization behavior of MgO-Al2O3-SiO2-TiO2 glasses containing Cr2O3 was investigated by means of differential thermal analysis (DTA), X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The crystallization activation energy (E) was also calculated by Ozawa and Kissinger methods. The results show that the initial precipitated phase and the main crystal phase are not changed by the Cr2O3 addition. Meanwhile, the glass transition temperature (Tg) increases and the crystallization apparent activation energy decreases. As a result the E values of cordierite is decreased, the formation of cordierite crystals is promoted. The glass-ceramic obtained by crystallization of the glass has dielectric constant around 5.5, and dielectric loss less than 7×10-4.

Key words: α-cordierite, glass-ceramics, crystallization activation energy, dielectric property

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