摘要
采用恒温热失重法研究了α-AlH_3的热分解过程,得到了α-AlH_3的动力学方程,计算了动力学参数。结果表明,α-AlH_3在热分解时符合Avrami-Erofeev方程,加速期和衰退期的Avrami指数n分别为3和2,表明在加速期反应时受到Al核三维生长控制,而在衰退期反应则是受到Al核二维生长控制。运用动力学方程计算了135℃恒温热分解的转化率(φ(t)),与实验测量值一致,认为该动力学方程可用于估算其他温度的热分解过程。
In this study, the kinetic equations of α-AIH3 powder has been obtained with kinetic coefficients using isothermal thermogravimetrie experiments.The results show that the kinetic model follows Avrami-Erofeev equation and n （Avrami-parameter） of acceleratory and decay period is 3 and 2, respectively.It has been demonstrated that the decomposition is controlled by mechanism of a three-dimensional growth of A1 nuclei in acceleratory period and two dimensional nuclei growth mechanisms during decay peri- od.In addition,we predicted the percent conversion （φ（t）） of isothermal decomposition at the 135 ℃ , which is great agreement with the experimental results using the obtained kinetic equation. It suggests that the kinetic equation can be used to estimate the process of α-AlH3 isothermal decomposition at different temperature.
作者
吴磊
马新刚
刘发龙
王敏
WU Lei, MA Xingang, LIU Falong, WANG Min(Hubei Institute of Aerospace Chemotechnology, Xiangyang 441003, China)
出处
《固体火箭技术》
EI
CAS
CSCD
北大核心
2018年第5期597-602,共6页
Journal of Solid Rocket Technology
关键词
AlH3
恒温热分解
拟合计算
动力学
AlH3
isothermal decomposition
fitting calculation
kinetic
