DNTF / CL-20 双组元体系热分解特性及机理研究

2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaazaisowurtzitane(CL-20)holds great promise for 3,4-dinitrofurazan oxyfurazan(DNTF)-based melt-case explosives.In this paper,the thermal decomposition properties and mechanism of DNTF/ CL-20 binary system(1 颐 1,mass ratio)were explored from both experimental analysis and kinetics simulation.The thermal decomposition properties of the binary system were investigated at 1.0 MPa by high pressure differential scanning calorimetry(PDSC),and its decomposition kinetics parameters were obtained through Kissinger equation.Simultaneous thermal analysis-FTIR-mass spectrometry (TG/ DSC-FTIR-MS)was used to study the composition and types of decomposition products,and to speculate the thermal decomposition mechanism; thermal decomposition kinetics parameters of the binary system under 1.0 MPa were obtained via NETZSCH Thermokinetics software.The results show that the peak temperature of CL-20 decrease first for low eutectic during the decomposition process at 1.0 MPa,and the gaseous products can promote the decomposition of DNTF to make its peak temperature to move forward. The whole decomposition begin at N—NO₂ bonds fracture in CL-20,and the produced catalytic molecules can crack its cage structure,to further breaking furazan rings and oxidized furoxan rings cleaved at N—O bonds,in which generate small molecules such as NO,CO,CO₂,N₂O,H₂O,NH₃ and NO₂.Additionally,the thermal decomposition mechanism is verified by kinetics simulation.This study provide a theoretical base about thermal decomposition and energy release principles of DNTF/ CL-20 binary system,and the data reference for the future application of CL-20 in DNTF-based melt-case explosives.