含CL-20的NEPE推进剂热分解

Thermal decomposition of NEPE propellant with CL-20

借助热重-微商热重(TG-DTG)试验和差示扫描量热(DSC)试验研究了含CL-20的NEPE推进剂的热分解特性,探索了主要组分NG、CL-20、AP和催化剂之间的相互作用。实验结果表明,该推进剂的热分解过程分3个阶段:增塑剂(NG)的挥发和分解,PEG+CL-20的分解,AP的分解。CL-20促进了NG和PEG的分解,NG与PEG并未影响CL-20的分解。AP的加入促进了CL-20的分解,同时CL-20也使AP的分解由单质2步分解合并为1步。Al粉在该体系中与其他组分的相互作用较弱。催化剂Ct1和Ct2在一定程度上抑制了推进剂中NG、CL-20和AP的起始分解,对于NG起始分解的抑制作用更为明显,当温度升高,抑制作用消失即分解开始时,分解速率大幅提高,从而使推进剂热分解的放热历程缩短,致使推进剂燃速提高。

Thermal decomposition behavior of NEPE propellant with CL-20 was investigated by means of TG-DTG and DSC test methods. The interactions among main ingredients NG, CL-20, AP and catalyst were discussed, The experimental results show that thermal decomposition can be divided into three stages, i, e. volatilization and decomposition of nitrate ester（ NG）, decomposition of PEG and CL-20, and decomposition of AP. CL-20 can accelerate decomposition of NG and PEG, while NG and PEG have little effect on decomposition of CL-20. Addition of AP accelerates decomposition of CL-20, at the same time CL-20 can make element two-step decomposition of AP merge into one-step. The interaction between A1 powder and other ingredients is weak. Catalyst Ctl and Ct2 to a certain extent inhibit initial decomposition of NG, CL-20 and AP, especially for decomposition of NG. With the temperature rising, the inhibition disappears, and thermal decomposition starts, so that decomposition reaction rate increases significantly, which can make exothermic decomposition process of the propellant shortened and burning rate increased.