Formation and characterization of core-shell CL-20/TNT composite prepared by spray-drying technique  

作　　者：Chang-gui Song Xiao-dong Li Yue Yang Hui-min Liu Ying-xin Tan Jing-yu Wang 

机构地区：[1]School of Environment and Safety Engineering,North University of China,Taiyuan,030051,China

出　　处：《Defence Technology（防务技术）》2021年第6期1936-1943,共8页Defence Technology

摘　　要：The core-shell 2,4,6,8,10,12-Hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane/2,4,6-Trinitrotoluene(CL-20/TNT)composite was prepared by spray-drying method in which sensitive high energy explosive(CL-20)was coated with insensitive explosive(TNT).The structure and properties of different formulations of CL-20/TNT composite and CL-20/TNT mixture were characterized by scanning electron microscopy(SEM),Transmission electron microscopy(TEM),Laser particle size analyzer,X-ray photoelectron spectroscopy(XPS),X-ray diffraction(XRD),differential scanning calorimetry(DSC),impact sensitivity test and detonation performance.The results of SEM,TEM,XPS and XRD show that e-CL-20 particles are coated by TNT.When the ratio of CL-20/TNT is 75/25,core-shell structure is well formed,and thickness of the shell is about 20e30 nm.And the analysis of heat and impact show that with the increase of TNT content,the TNT coating on the core-shell composite material can not only catalyze the thermal decomposition of core material(CL-20),but also greatly reduce the impact sensitivity.Compared with the CL-20/TNT mixture(75/25)at the same ratio,the characteristic drop height of core-shell CL-20/TNT composite(75/25)increased by 47.6%and the TNT coating can accelerate the nuclear decomposition in the CL-20/TNT composites.Therefore,the preparation of the core-shell composites can be regarded as a unique means,by which the composites are characterized by controllable decomposition rate,high energy and excellent mechanical sensitivity and could be applied to propellants and other fields.

关 键 词：Energetic materials CL-20(2 4 6 8 10 12-hexanitro-2 4 6 8 10 12-hexaazaisowurtzitane) TNT(2 4 6-Trinitrotoluene) Spray-drying method Core-shell structure 

分 类 号：TJ04[兵器科学与技术—兵器发射理论与技术]