Crystallization Kinetics of R2O-CaO-Al2O3-SiO2-F Glass-Ceramics

被引：0
|
作者：
Zhao Q. [1 ]
Yang H. [1 ]
Cao J. [2 ]
Li W. [1 ]
Shen S. [1 ]
Liu H. [1 ]
机构：
[1] Beijing General Research Institute of Mining & Metallurgy, Beijing
[2] National Engineering Laboratory for Hydrometallurgical Cleaner Production Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing
来源：
Kuei Suan Jen Hsueh Pao/Journal of the Chinese Ceramic Society | 2020年 / 48卷 / 07期
关键词：
Crystallization activation energy; Crystallization kinetics; Gaussian fitting; Glass-ceramics; Temperature-time-transition curve;
D O I：
10.14062/j.issn.0454-5648.20190668
中图分类号：
学科分类号：
摘要：
R2O-CaO-SiO2-Al2O3-F (RCSAF) glass-ceramics were prepared via melting method. The nucleation and crystal growth kinetics of RCSAF glass-ceramics were analyzed by thermogravimetric analysis and X-ray diffraction. The nucleation and crystal growth kinetics of the glass-ceramics were obtained by Gaussian fitting. The temperature-time-transition (T-T-T) curve of R2O-CaO-SiO2-Al2O3-F glass-ceramics under non-isothermal heating conditions was obtained, and the Gaussian fitting of glass-ceramics and crystal growth kinetics were obtained. The crystallization kinetic parameters includingthe crystallization apparent activation energy (Ea) and the crystallization index (n) were also measured with Ozawa and JMA methods (i.e. Ea=357.74 kJ/mol, n=3.13). Effects of time, temperature and precipitated crystal phase on the crystallization rate curve of R2O-CaO-SiO2-Al2O3-F glass-ceramics were established. TheCaF2 crystal particles precipitated from glass-ceramics were uniformly distributed in canasite and α-canasite. The crystal precipitation process of RCSAF glass-ceramics was further verified by typical crystal structure presented in scanning electron microscopic images. © 2020, Editorial Department of Journal of the Chinese Ceramic Society. All right reserved.
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页码：1114 / 1121
页数：7
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