Process optimization of preparation of HMX based aluminized explosives through the spray drying method

DOI:	10.11809/bqzbgcxb2023.01.035
Keywords:	spray drying; aluminized explosives; HMX; morphology; effect of coating; impact sensitivity
Abstract:	By using acetone as the solvent and fluororubber F2602 as the binder, this paper makes HMX based aluminized explosives by the spray drying technology. The effects of inlet temperature, feed rate and nitrogen flow rate on its properties are also studied. SEM is used to observe the morphological characteristics of composite particle samples of HMX based aluminized explosives. XPS is used to test the surface element contents and coating effect of the raw material HMX and composite particle samples, and the impact sensitivity of the raw material HMX and composite particle samples are measured by an impact sensitivity tester. The results show that the optimal process term parameters for the preparation of HMX based aluminized explosives by the spray drying method are an inlet temperature of 70 ℃, a feed rate of 4.5 mL·min -1 and a nitrogen flow rate of 473 L·h -1 . At this time, the prepared composite particle samples have a uniform size, a high degree of sphericity, smooth surface and fewer defects. At the same time, the surface binder, fluororubber F2602, has the highest content, the nano aluminum powder has the lowest content, with a coating degree as high as 84.85% and a good coating effect. Compared with the raw material HMX, the impact energy increases by 7 J, the impact sensitivity significantly reduces, and the safety performance significantly improves.
Published:	2023-01-28
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