Preparation And Properties Of CL-20 Filled New Carbon-based Porous Material Composite Structure

Hexanitrohexaazaisowurtzitane（CL-20）is a new energetic material with high energy density,fast energy release rate,and low characteristic signal.However,its poor safety performance（high mechanical sensitivity）and low self-sustaining combustion performance greatly restrict its practical charging application.Therefore,it is particularly important to select appropriate methods to improve the comprehensive performance of CL-20.At present,new carbon-based materials are often used as additives in CL-20 modification because of their excellent physical and chemical properties.However,the current research on the properties of carbon based composite energetic materials mainly focuses on the formulation design,ignoring the agglomeration effect of nano carbon-based materials,and its safety and energy characteristics are constrained.Therefore,in this paper,a new carbon-based porous frame material was prepared by various methods,and CL-20 was filled into the frame holes.Exploring a new way to solve the problem of agglomeration of nano-carbon-based materials in composite energetic materials,and improve the comprehensive performance of CL-20.The main research contents and results are as follows:（1）The nanoporous carbon scaffold（NCS）was used as the template,CL-20 was filled into the NCS pores by the method of template adsorption of solvent,and the CL-20/NCS sandwich composite structure was fabricated.The morphology,crystal structure,and element distribution of NCS and CL-20/NCS composite structures were analyzed by various characterization methods.The thermal decomposition performance of the composite structure was tested.The results showed that the thermal decomposition performance of the CL-20/NCS sandwich composite structure was significantly improved,and the NCS with a pore size of 15 nm had the best catalytic effect.The peak temperature of CL-20 was decreased by 16.9℃.The activation energy（Ea）was decreased by 100.1 kJ/mol.（2）Graphene foam（GF）was prepared by hydrothermal method using graphene oxide（GO）as raw material,and CL-20 was filled into the GF framework structure by the method of template adsorption solvent to obtain CL-20/GF composite structure.The morphology,crystal structure,element distribution,and functional group composition of GF and CL-20/GF composite structure were analyzed by various characterization methods.The thermal decomposition performance and sensitivity characteristics of the composite structure were tested,and the detonation parameter of the composite structure was calculated.The results show that the thermal decomposition performance of the CL-20/GF composite structure is improved,the peak temperature is decreased by 13.1℃,and the Ea is decreased by 23 kJ/mol.Compared with the CL-20,the impact sensitivity is increased by 16%,and the friction sensitivity is reduced by 69%.The detonation velocity of the composite structure is reduced to 9024 m/s,and the detonation pressure is reduced to 40.59 Gpa.（3）GO/KGM aerogel（KGA）was prepared by ice template method using GO,glucomannan（KGM）as raw materials,and CL-20 was filled into KGA frame structure by template adsorption solvent to obtain CL-20/KGA composite structure.The morphology,crystal structure,element distribution,and functional group composition of KGA were analyzed by various characterization methods.The thermal decomposition performance and sensitivity characteristics of the composite structure were tested,and the detonation parameter of the composite structure was calculated.The results show that the thermal decomposition performance of CL-20/KGA composite structure is improved,the peak temperature is reduced by 5.0℃,and Ea is reduced by 61.1 kJ/mol.Compared with CL-20,the impact sensitivity of the composite structure is increased by 8%,and the friction sensitivity is reduced by 69%.The explosion velocity of the composite structure is reduced to 9061 m/s,and the explosion pressure is reduced to 41.01 GPa.