摘要
用高能猛炸药(如六硝基六氮杂异伍兹烷(CL?20))代替传统固体推进剂是实现小体积大比冲微型推进剂的重要途径。为了实现CL?20的自持燃烧,设计了CL?20镶嵌rGO三维网络结构的复合推进剂体系。首先采用溶剂?非溶剂法制备了超细CL?20球形颗粒(直径300 nm～2μm),然后利用维度限域水热技术制备了自支撑rGO/CL?20纤维推进剂。在热分析动力学和燃烧特性分析的基础上,探讨了rGO/CL?20纤维推进剂的燃烧传播机制,认为该复合体系两种物质放热的正反馈机制是实现其燃烧传播的关键因素。由于rGO三维网络的构建,既提高了纤维的热导率,同时rGO在KOH作用下的放热可作为rGO三维网络和CL?20颗粒燃烧的起始能量,而具有更高能量密度的CL?20的燃烧放热叠加于rGO的放热,形成放热的正反馈机制。所制备的自支撑rGO/CL?20纤维推进剂的燃烧传播速度为20.66 mm·s^(-1),其纤维状结构为微型推进器的模块化快速装药提供了方便。
Replacing traditional solid propellants with high-energy explosives(such as hexanitrohexaazaisowurtzitane(CL-20))is an important way to achieve microthrusters with small size and large specific impulse.In order to realize the self-sustaining combustion of CL-20,a composite propellant system with CL-20 nano-microparticles hosted in the rGO three-dimensional network is designed.Ultrafine CL-20 spherical particles(diameter 300 nm-2μm)have been prepared by a solvent-nonsolvent method firstly,then self-supporting rGO/CL-20 fiber propellant was prepared by a dimensionally confined hydrothermal strategy.Based on the analysis of thermal analysis kinetics and combustion characteristics,it is concluded that the positive feedback mechanism of the combustion heat release of rGO/CL-20 fiber propellant plays a key role in its combustion propagation.Due to the construction of rGO three-dimensional network,the thermal conductivity of the fiber propellant is improved,and the exothermic effect of rGO/KOH can serve as the initial ignition energy for rGO itself and CL-20 microparticles.Once ignited,the combustion of high-energy CL-20 releases more heat energy than rGO,thereby forming the positive feedback mechanism.The combustion propagation speed of the prepared self-supporting rGO/CL-20 fiber propellant is 20.66 mm·s-1,moreover,the fibrous structure facilitates the rapid modular charge of the microthrusters.
作者
李小东
黄兵
谯志强
陈瑾
杨光成
LI Xiao-dong;HUANG Bing;QIAO Zhi-qiang;CHEN Jin;YANG Guang-cheng(Institute of Chemical Materials,CAEP,Mianyang 621999,China)
出处
《含能材料》
EI
CAS
CSCD
北大核心
2018年第12期1003-1008,共6页
Chinese Journal of Energetic Materials
基金
国家自然科学基金资助(21703217)
