柠檬酸铋的热分解机理、非等温反应动力学及其对双基推进剂燃烧的催化作用

Thermal Decomposition Mechanism,Non-isothermal Reaction Kinetics of Bismuth Citrate and Its Catalytic Effect on Combustion of Double-base Propellant

用TG和DSC以及变温固相原位反应池/傅里叶红外光谱(RSFTIR)联用技术研究了柠檬酸铋的热分解行为,提出了可能的反应机理,并计算了主分解反应的动力学参数.柠檬酸铋主分解反应的表观活化能和指前因子分别为213.82 kJ/mol和1016.48s-1.将柠檬酸铋应用到双基推进剂配方中研究其对双基推进剂燃烧性能的影响,结果表明,柠檬酸铋对双基推进剂燃烧有良好的催化作用,能显著提高双基推进剂的燃速,降低压力指数,特别是与少量炭黑(CB)复合后,对双基推进剂燃烧的催化效果更好.

The thermal decomposition reaction of bismuth citrate in a temperature-programmed mode was investigated by TG-DTG, DSC and heating in-situ cell/FTIR. The decomposition mechanism was proposed, and the kinetic parameters of the major decomposition reaction were calculated. The apparent activation energy and pre-exponential factor of the major decomposition reaction of bismuth citrate are 213. 82 kJ/mol and 1 016.48 s^-1 respectively. The kinetic equation of the major decomposition process can be expressed as： da/dt = 10^16.48exp（ -2. 56188 × 10^4/T） [ - In（ 1 - α）^2/3 ]. The catalytic performance of CIT-Bi in the combustion of double-base propellant was also investigated. The result shows that CIT-Bi possesses a good catalytic function. It can markedly increase the burning rate of double-base propellant and reduce pressure exponent. Especially, when CIT-Bi together with a little carbon black （CB） is used, the Catalytic efficiency is higher.