Abstract: A series of experimental studies on aluminum-magnesium mixed powder were carried out using a 20 L spherical explosive device. The effects of dust concentration, ignition delay, ignition energy and component ratio of magnesium- aluminum mixed powder on the explosion characteristics were studied. Results showed that: the maximum explosion pressure and explosion index of 1:1 Mg/Al mixed powder (about 7 μm) first increase and then decrease at different concentrations. Compared with aluminum powder, the explosion parameters and explosion risk level of magnesium- aluminum mixed powder were higher. There is a lower dust concentration corresponding to the maximum value of explosion parameters for mixed powder than that of aluminum powder. The ignition delay has a greater influence on the explosion parameters of magnesium aluminum mixed powder, and there is shorter ignition delay time (40 ms) than aluminum powder (60 ms) to make the explosion parameters reach the maximum value.When other conditions remain unchanged, if the ignition energy decreases and the aluminum powder content increases regularly the explosion risk and power of magnesium- aluminum mixture powder decreases linearly.

Key words: magnesium aluminum mixed powder, explosion characteristic, maximum explosion pressure, explosive index