火炸药学报2018，Vol.41Issue(1)：77-81,5.DOI:10.14077/j.issn.1007-7812.2018.01.015
CL-20晶型ε→γ等温相变动力学
Kinetics of ε→γ Isothermal Phase Transition of CL-20
摘要
Abstract
To investigate the law of crystal phase transition polymorphic explosive CL-20,the kinetics of ε→γ phase transition of CL-20 was isothermally studied by an in-situ infrared diffuse reflectance spectroscopy.The phase conversion extent was characterized by the decrease of IR characteristic peak intensity of ε-CL-20.The kinetic parameters of isothermal phase transition were obtained by using Avrami-Erofeev equation to describe the conversion extent -time curves of e→γ phase transition of CL-20 at four temperatures of 160,165,170 and 175℃.The results show that:taking the conversion extent 18％ as a turning point,the phase transition process can be divided into two stages which follow different kinetic mechanism function respectively.When the range of the conversion extent is 1％-18 ％,the phase transition mechanism follows Avrami-Erofeev equation with random nucleation and growth (n =0.60-0.76) while the activation energy Ea is 150.6 kJ/mol and the calculated pre-exponential constant ln(A/s-1) is 38.1;When the range of the conversion extent is 18％-94％,the phase transition mechanism follows Avrami-Erofeev equation with random nucleation and growth (n=1.18-1.25) while the activation energy Ea is 289.4 kJ/mol and the calculated pre-exponential constant ln(A/s-1) is 74.7.关键词
晶体化学/CL-20/晶型转变/原位漫反射红外光谱法/等温动力学Key words
crystal chemistry/CL-20/crystal transition/in-situ infrared diffuse reflectance spectroscopy/isothermal kinetics分类
军事科技引用本文复制引用
潘清,朱一举,王明,高红旭..CL-20晶型ε→γ等温相变动力学[J].火炸药学报,2018,41(1):77-81,5.基金项目
国家自然科学基金项目(No.21473131) （No.21473131）
