Efficient Preparation and Performance Characterization of the HMX/[F.sub.2602] Microspheres by One-Step Granulation Process

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From: Journal of Nanomaterials(Vol. 2018)
Publisher: Hindawi Limited
Document Type: Article
Length: 3,616 words
Lexile Measure: 1310L

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Abstract :

A new one-step granulation process for preparing high melting explosive- (HMX-) based PBX was developed. HMX/[F.sub.2602] microspheres were successfully prepared by using HMX and [F.sub.2602] as the main explosive and binder, respectively. The particle morphology, particle size, crystal structure, thermal stability, and impact sensitivity of the as-prepared HMX/[F.sub.2602] microspheres were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), laser particle size analyzer, differential scanning calorimetry (DSC), and impact sensitivity test, respectively. The SEM analysis indicated successful coating of [F.sub.2602] on the surface of HMX, and the resulting particles are ellipsoidal or spherical with a median particle size of 940 nm; the XRD analysis did not show any change in the crystal structure after the coating and still has [beta]-HNX crystal structure; according to the DSC analysis, HMX/[F.sub.2602] prepared by the new method has better thermal stability compared to that prepared by the water suspension process. The impact sensitivity of HMX/[F.sub.2602] prepared by this one-step granulation process decreased, and its characteristic height [H.sub.50] increased from 37.62 to 40.13 cm, thus significantly improving the safety performance. More importantly, this method does not need the freeze-drying process after recrystallization, thus increasing the efficiency by 2 to 3 times.

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Gale Document Number: GALE|A592904072