含能材料2025，Vol.33Issue(9)：1103-1112,10.DOI:10.11943/CJEM2025151
湿热耦合作用下ε-HNIW的多路径相变行为与诱导机制
Multipath Phase Transition Behavior and Inducement Mechanisms of ε-HNIW under Hygrothermal Coupling
摘要
Abstract
To investigate the structural stability of ε-Hexanitrohexaazaisowurtzitane(ε-HNIW)crystals under hygrothermal condi-tion and the underlying mechanism,the phase transition behavior of ε-HNIW was studied by accelerated aging tests,in-situ X-ray diffraction,and molecular dynamics simulations.It was found that the phase transition temperature of ε-HNIW significant-ly decreased from 135℃under thermal condition to 80℃in hygrothermal environments.A multipath phase transition behavior,including ε→γ and ε→α,was observed for ε-HNIW crystals with different crystal sizes,indicating that crystal characteristics are the key factors to the phase transition behavior of ε-HNIW.In addition,the ultrafine ε-HNIW shows a fastest rate of the ε→γ transition.Under hygrothermal conditions with relative humidity below 70％,the phase transition of ε-HNIW was not obvious,but the microstructural damage caused by the hydrothermal condition will reduce the stability of the ε-HNIW,resulting in a de-creased thermal transition temperature.Combined with theoretical calculations,it is generally concluded that the hygrothermal environment can induce liquid-solid interfacial reactions on the ε-HNIW crystals.This process leads to the embedding of water molecules into the internal of raw ε-HNIW and the ε-HNIW crystal with normal and large sizes,resulting in the formation of α-HNIW.As to the ultra-fine ε-HNIW,a γ phase,which is stable at high temperature,was generated by this interfacial reaction induces transformation.Therefore,through this surface micro-dissolution-induced nucleation and growth mechanism,the water molecule can significantly promotes the phase transition of ε-HNIW under hygrothermal condition.关键词
六硝基六氮杂异伍兹烷(CL-20)/湿热环境/晶体特性/多路径相变/界面微溶诱导机制Key words
HNIW/hygrothermal environment/crystal characteristics/multidirectional polymorphic transformation/micro-dissolve induced mechanism分类
军事科技引用本文复制引用
徐金江,池钰,李诗纯,黄石亮,刘渝..湿热耦合作用下ε-HNIW的多路径相变行为与诱导机制[J].含能材料,2025,33(9):1103-1112,10.基金项目
国家自然科学基金(22275177,21805259) National Natural Science Foundation of China(Nos:22275177,21805259) （22275177,21805259）
