Effect of TiH₂ Particle Size on Properties of Emulsion Explosive

In order to achieve emulsion explosives with high power and good thermal stability, an emulsion explosive containing TiH₂ with varying particle sizes was developed, and its properties were determined through experimental analysis. The results of detonation velocity experiments revealed that the incorporation of TiH₂ reduces the detonation velocity, with the degree of reduction being dependent on the particle size of TiH₂. Specifically, when the particle size of TiH₂ is 44, 30, and 10 μm, the detonation velocity decreases by 5.8, 3.9, and 3.0%, respectively. Furthermore, experiments on explosion heat and brisance showed that TiH₂ improves the heat of detonation and brisance of the explosives. Specifically, when the particle sizes of TiH₂ are 44, 30, and 10 μm, the heat of detonation increases by 4.1, 4.5, and 5.0%, respectively, and the brisance increases by 15.3, 16.6, and 19.1%, respectively. Additionally, TG-DTG experiments revealed that while TiH₂ does not affect the thermal decomposition characteristics of the emulsified matrix, it does impact its apparent activation energy. Specifically, when the particle size of TiH₂ is 44 μm, the apparent activation energy is reduced by approximately 21.0%. When the particle size is 30 μm, the apparent activation energy remains largely unaffected. However, when the particle size is 10 μm, the apparent activation energy increases by approximately 41.5%.