假定非等温条件时,对玻璃结晶有用的总体相变的广义动力学

IF 0.3 4区 材料科学 Q4 CHEMISTRY, PHYSICAL
I. Avramov, J. Šesták
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引用次数: 2

摘要

反应动力学的建模是出版物的时髦主题。我们建立了一个非等温条件下α(T)=1−exp(−(T/θ)N)的近似的KJMA方程,它描述了在恒定速率q下,特征温度θ(q)和功率N与Avrami参数N成正比的转变程度α(T)的依赖关系。该方程即使在过程的活化能不恒定时也是有效的。我们证明,当实验数据在坐标:logq(升温速率)和logTp(峰值温度)中绘制时,可以获得有关活化能的可靠信息。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Generalised kinetics of overall phase transition useful for glass crystallisation when assuming non-isothermal conditions
The modelling of reaction kinetics is a fashionable subject of publications. We developed an analogue of the KJMA equation under non-isothermal conditions α(T)=1−exp(−(T/θ)N) that describes the dependence of degree of transformation α(T) at a constant rate, q, of heating with characteristic temperature θ(q) and power N, proportional to the Avrami parameter, n. This equation is valid even when the activation energy of the process is not constant. We demonstrate that reliable information about the activation energy is obtained when the experimental data are plotted in coordinates: logq (heating rate) against logTp (peak temperature).
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来源期刊
CiteScore
0.70
自引率
33.30%
发文量
0
审稿时长
1 months
期刊介绍: Physics and Chemistry of Glasses accepts papers of a more purely scientific interest concerned with glasses and their structure or properties. Thus the subject of a paper will normally determine the journal in which it will be published.
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