Study on inhibition of titanium powder explosion by melamine polyphosphate/iron modified carbon nanotube composite powder

In order to effectively inhibit the explosion of titanium powder, MPP-Fe@CNT mesoporous composite powder was prepared using carbon nanotubes as the carrier. Dust explosion experiment system and Hartmann experiment system were used to test the inhibition effect of MPP-Fe@CNT powder on the explosion pressure and explosion flame of titanium powder, and the explosion products were analyzed by FTIR and XPS experimental methods. The results show that when the proportion of MPP-Fe@CNT reaches 50 %, the maximum explosion pressure of titanium powder decreases from 0.5476 MPa to 0.2421 MPa, and the flame propagation distance decreases to 227.39 mm, which indicates that MPP-Fe@CNT has obvious inhibition effect on the explosion of titanium powder. MPP-Fe@CNT powder absorbs a lot of heat in the thermal decomposition process, and the released gas dilutes the concentration of oxygen. Chemical reactions of phosphorus-containing compounds consume free radicals and inhibit the explosion of titanium powder. Under the catalysis of iron, the polymer generated by decomposition and phosphorus-containing substances quickly form a dense carbonized film on the surface of titanium powder, blocking heat and oxygen, further limiting the explosive reaction, and having a good physicochemical synergistic inhibition effect to achieve a good effect of inhibiting the explosion of titanium powder.