The pyrotechnic compositions made up of potassium perchlorate (KClO₄) and titanium hydride (TiH₂), known as THKP, have a fast deflagration velocity (∼500 m/s), along with low sensitivity and high stability. In this research, a new kind of THKP was formulated from a submicron powder of KClO₄ (50–400 nm) prepared by the Spray Flash-Evaporation (SFE) process. The use of fine KClO₄ not only ensures better oxidation of TiH₂, but also leads to a transition to detonation in the THKP. This transition is observed in loose powders placed in small diameter tubes (3 mm). The distance of transition is relatively short (17–22 mm) and increases with the KClO₄ content of the THKP mixture. The detonation front propagates steadily, at a velocity of ∼1250 m/s in THKP powders with 86 % of porosity. The shockwave velocity varies little with the perchlorate content in the domain of composition studied (55–74 wt.% of KClO₄). Conversely, in the classical THKP mixtures prepared from micron-sized KClO₄ and tested in the same conditions, no transition to detonation is observed; the combustion slows down and eventually stops. Finally, owing to their high sensitivity thresholds to impact (S_Imp.≥44.7 J), friction (S_Fr.≥192 N), and electrostatic discharge (S_ESD≥34.7 mJ), THKP mixtures prepared from submicron KClO₄ can be classified as low-sensitivity primary explosives.

中文翻译：

---

亚微米高氯酸钾：在与氢化钛的二元混合物中实现爆炸的关键成分

由高氯酸钾 (KClO ₄ ) 和氢化钛 (TiH ₂ )组成的烟火组合物，称为 THKP，具有快速的爆燃速度 (~500 m/s)，同时具有低灵敏度和高稳定性。在本研究中，采用喷雾闪蒸 (SFE) 工艺制备的亚微米 KClO ₄ (50–400 nm)粉末配制了一种新型 THKP 。使用精细 KClO ₄不仅确保了 TiH ₂更好的氧化，而且导致在 THKP 中过渡到爆炸。在放置在小直径管 (3 mm) 中的松散粉末中可以观察到这种转变。过渡距离相对较短 (17–22 mm) 并随着 KClO _{4 的}增加而增加THKP 混合物的含量。在孔隙率为 86% 的 THKP 粉末中，爆轰前沿以~1250 m/s 的速度稳定传播。冲击波速度随所研究的组成域中的高氯酸盐含量（55-74 wt.% 的 KClO ₄）而变化很小。相反，在由微米级 KClO ₄制备并在相同条件下测试的经典 THKP 混合物中，没有观察到爆炸转变；燃烧减慢并最终停止。最后，由于它们对冲击 (S _Imp. ≥44.7 J)、摩擦 (S _Fr. ≥192 N) 和静电放电 (S _ESD ≥34.7 mJ)的高灵敏度阈值，由亚微米 KClO ₄制备的 THKP 混合物 可归类为低灵敏度初级炸药。