Hazard evaluation of ignition sensitivity and explosion severity for three typical MH2 (M= Mg, Ti, Zr) of energetic materials

Defence Technology

Ai-min Pang¹  Da-bin Liu¹  Xu Wang²  Xing-liang Wu²  Sen Xu²  Fei-yang Xu²  Xin-yu Zhu³  Wei-guo Cao⁴ 

[1]Corresponding author.

[2]School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing, Jiangsu, 210094, PR China

[3]School of Environmental and Safety Engineering, North University of China, Taiyuan, 030051, Shanxi, PR China

[4]Science and Technology on Aerospace Chemical Power Laboratory, Hubei Institute of Aerospace Chemotechnology, Xiangyang, 441003, PR China

关键词: Ignition energy;    Explosion pressure;    Reaction activity;    Combustion heat;   

DOI  :  

来源: DOAJ

【 摘 要 】

MgH2, TiH2, and ZrH2 are three typical metal hydrides that have been gradually applied to composite explosives and propellants as additives in recent years. To evaluate ignition sensitivity and explosion severity, the Hartmann device and spherical pressure vessel were used to test ignition energy and explosion pressure, respectively. The results showed that the ignition sensitivity of ZrH2, TiH2 and MgH2 gradually increased. When the concentration of MgH2 is 83.0 g/m3 in Hartmann device, the ignition energy attained a minimum of 10.0 mJ. The explosion pressure of MgH2 were 1.44 times and 1.76 times that of TiH2 and ZrH2, respectively, and the explosion pressure rising rate were 3.97 times and 9.96 times that of TiH2 and ZrH2, respectively, through the spherical pressure vessel. It indicated that the reaction reactivity and reaction rate of MgH2 were higher than that of TiH2 and ZrH2. In addition, to conduct in–depth theoretical analysis of ignition sensitivity and explosion severity, gas production and combustion heat per unit mass of ZrH2, TiH2 and MgH2 were tested by mercury manometer and oxygen bomb calorimetry. The experimental results revealed that MgH2 had a relatively high gas production per unit mass (5.15 mL/g), while TiH2 and ZrH2 both had a gas production of less than 2.0 mL/g. Their thermal stability gradually increased, leading to a gradual increase in ignition energy. Furthermore, compared with theoretical combustion heat, the combustion ratio of MgH2, TiH2 and ZrH2 was more than 96.0%, with combustion heat value of 29.96, 20.94 and 12.22 MJ/kg, respectively, which was consistent with the explosion pressure and explosion severity test results.

【 授权许可】

Unknown