摘要：MgH 2 , TiH 2 , and ZrH 2 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 ZrH 2 , TiH 2 and MgH 2 gradually increased. When the concentration of MgH 2 is 83.0 g/m 3 in Hartmann device, the ignition energy attained a minimum of 10.0 mJ. The explosion pressure of MgH 2 were 1.44 times and 1.76 times that of TiH 2 and ZrH 2 , respectively, and the explosion pressure rising rate were 3.97 times and 9.96 times that of TiH 2 and ZrH 2 , respectively, through the spherical pressure vessel. It indicated that the reaction reactivity and reaction rate of MgH 2 were higher than that of TiH 2 and ZrH 2 . In addition, to conduct in–depth theoretical analysis of ignition sensitivity and explosion severity, gas production and combustion heat per unit mass of ZrH 2 , TiH 2 and MgH 2 were tested by mercury manometer and oxygen bomb calorimetry. The experimental results revealed that MgH 2 had a relatively high gas production per unit mass (5.15 mL/g), while TiH 2 and ZrH 2 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 MgH 2 , TiH 2 and ZrH 2 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.
