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In order to effectively inhibit the explosion of titanium powder, this study used the Hartmann tube experimental system and the 20 L explosion tank experimental system to carry out flame propagation and explosion overpressure experiments, respectively, and the effect of NH 4 H 2 PO 4  on the explosion suppression of titanium powder was studied. The results show that when the addition of NH 4 H 2 PO 4  powder is 50%, the flame propagation velocity and explosion pressure can be reduced to the minimum, and the explosion pressure can be basically suppressed. Finally, the inhibition mechanism of NH 4 H 2 PO 4  on the explosion of titanium powder was analyzed. The endothermic decomposition of NH 4 H 2 PO 4  absorbed the energy needed by the explosion of titanium powder. Oxides produced by the decomposition of NH 4 H 2 PO 4  powder cover the surface of titanium powder, increase the thickness of the oxide film, and play a role of heat insulation; the gaseous water produced by the decomposition of NH 4 H 2 PO 4  powder reduces the concentration of oxygen in the air and increases the difficulty of the explosion reaction. NH 4 H 2 PO 4  powder traps the free radicals needed for the explosion to block the chain reaction.

Study on inhibition effect and mechanism of NH 4 H 2 PO 4 on explosion of titanium powder