氟锆酸盐玻璃析晶动力学研究

Study on the Crystallization Kinetics of Fluorozirconate Glasses

本文用差示热分析ＤＴＡ研究了ＮａＦ和ＮａＣｌ的引入对氟锆酸盐玻璃析晶动力学参数的影响，指出ＮａＦ和ＮａＣｌ的引入使氟锆酸盐玻璃析晶活化能下降，Ｔｘ—Ｔｇ增加，改善了玻璃形成能力．用Ａｕｇｉｓ－Ｂｅｎｎｅｔｔ法及修正Ｋｉｓｓｉｎｇｅｒ法处理实验结果，所得析晶活化能基本一致，而由Ａｕｇｉｓ－Ｂｅｎｎｅｔｔ法得到的频率因子较由修正Ｋｉｓｓｉｎｇｅｒ法得到的频率因子小一个数量级．同时用一种新的析晶动力学判据Ｋｙ（Ｔ）＝ｖｅｘｐ（－Ｅ／ＲＴ×△Ｔ／Ｔｍ（△Ｔ＝Ｔｘ—Ｔｇ）来判断氟锆酸盐玻璃形成能力，并与别的判据进行了分析比较．析晶活化能与玻璃的热稳定性有关．

The effect of NaF and NaCl addition on the crystallization kinetics of fluorozirconate glasses was studied by differential thermal analysis (DTA). The activation energy for crystallization was obviously decreased, Tx-Tg increased and the glass-forming ability improved by the addition of NaF and NaCl.DTA experimental results were analysed by Augis-Bennett method and modified Kissinger method. The crystallization activation energies obtained from both Augis-Bennett and modified Kissinger methods are almost the same, while the frequency faCtor v obtained from Augis-Bennett method is one magnitude lower than that from modified Kissinger method. The stability of fluorozirconate glasses was evaluated by a new crystallization kinetic criterion ky(T)=vexp(-E/RT ×△T/Tm) (△T = Tx-Tg) and correlated with the activation energy and compared with those evaluated by other criteria.