Abstract：To improve the aluminized explosive detonation heat performance, explore preparation method of high-activated aluminum powder, spherical aluminum powders were processed with a ball mill, and the effects of agitation speed, grinding time and grinding aid ratio on particle size, morphology and thermal properties of activated aluminum powder were studied. The morphology, particle size, and thermal decomposition of activated aluminum powder were characterized by scanning electron microscopy, laser particle size tester and synchronous thermal analyzer. Active aluminum content was determined by thermal analysis parameter method. Experimental results show that the best conditions to prepare active aluminum powder are stirring speed of 1 100 r/min, grinding time of 4 h, grinding aid ratio of4%. Under these conditions, the particle size d₅₀ of the aluminum powder after grinding is 1.108 μm, and the active aluminum content of active aluminum powder is increased from 90.42% to98.42%. In aluminized explosive, detonation heat value is increased from 6 805 to 7 642 kJ/kg.

Keywords: spherical aluminum powder; content of active aluminum; ball milling; detonation heat; thermal decomposition performance