六硝基六氮杂异伍兹烷的燃烧和催化热分解研究

通过燃速测定、差示扫描量热技术(DSC)和热失重技术(TG)研究了有机金属化合物催化剂(OME)对六硝基六氮杂异伍兹烷(HNIW)单元推进剂热分解和燃烧性能的影响。在1～13MPa的燃烧压力范围内，OME能够提高HNIW低压燃速和降低高压燃速，显著地降低燃速压力指数；不同加热速率下的DSC和TG分析显示，OME加速了HNIW的初始热分解，但提高了后期分解的活化能。讨论了OME HNIW的燃烧性能与热分解之间的关系，提出HNIW的燃烧在低压和高压下分别有不同的燃速控制步骤。

A STUDY ON THE COMBUSTION AND THERMAL DECOMPOSITION OF HEXANITROHEXAAZAISOWURTZITANE

Catalyst of the organo-metallic compound (OME) on the combustion and thermal decomposition of HNIW monopropellant was investigated through burning rate measurement, DSC and TG thermal analysis. It is shown that OME can increase the burning rate of HNIW at low pressures, but decrease it at higher pressures. Consequently, OME reduces the exponent for the dependence of the burning rate on pressure for HNIW. DSC and TG tests for HNIW and HNIW + OME were carried out at different heating rates. Kinetic analysis for DSC and TG data shows that OME accelerates the initial thermal decomposition of HNIW, but increases the activation energy of the upper thermal decomposition of HNIW. The relation between combustion properties and thermal decomposition characteristics of HNIW were established. It is considered that combustion of HNIW under low and high pressures are controlled by the initial and upper thermal decomposition, respectively.