Study on the Influencing Factors of Ultrafine Spherical RDX during Spray Drying with Low Speed

Xu, Wenzheng; Wang, Jie; Peng, Jinyu; Liang, Xin; Li, Hao

doi:10.1155/2019/7915129

Cited by 11 publications

(5 citation statements)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As the temperature rises, a large number of free radicals in PMMA and NC were decomposed and produced in advance, which induced the premature thermal decomposition of RDX. This situation is consistent with previous reports in the relevant literature [19].…”

Section: Thermal Performance Analysissupporting

confidence: 94%

Preparation, High-Density Spherical, and Low Sensitivity of RDX/NC/PMMA Composite Particles

Jia

Peng

et al. 2021

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

In order to reduce the mechanical sensitivity of cyclotrimethylenetrinitramine (RDX) and improve its energy density, spherical RDX/PMMA/NC composite particles were prepared by spray drying method, selecting polymethyl methacrylate (PMMA, hydrocarbon binder) with excellent mechanical properties and nitrocellulose (NC, energy-containing binder) with higher density as the desensitizing shell material, RDX as the core material. PMMA/NC composite particles of the same component were prepared by a simple solvent evaporation method at the same time. Structural characterizations and thermal stability of the composites were systematically studied by scanning electron microscopy (SEM), X-ray diffraction (XRD), and differential scanning calorimeter (DSC), respectively. Moreover, the safety performance has been qualitatively tested and analyzed through impact sensitivity and friction sensitivity. The results show that the addition of NC/PMMA binder would not change the original crystal structure of RDX, and the RDX/NC/PMMA composites fabricated by spray drying presented spherical particles with uniform distribution and smooth surface. The Tp0 of RDX/NC/PMMA composite particles increased from 220.3°C to 228.2°C, improving the thermal decomposition performance. The H50 rose from 29.32 cm to 84.3 cm, and the probability of friction explosion decreased from 96% to 8%, significantly enhancing the safety performance. In short, the RDX/NC/PMMA composites prepared via the spray drying method and the improvement of their performance have positive significance for the development of explosives in pursuit of high energy and low sensitivity.

show abstract

Section: Thermal Performance Analysissupporting

confidence: 94%

Preparation, High-Density Spherical, and Low Sensitivity of RDX/NC/PMMA Composite Particles

Jia

Peng

et al. 2021

Journal of Nanomaterials

Self Cite

View full text Add to dashboard Cite

show abstract

“…Spray-drying can easily control the composition and particle size of a product. It has been extensively used in the preparation of energetic materials [15][16][17]. For instance, a kind of aluminum/HMX nanocomposite was prepared by Zhigach et al [18] successfully with the spray-drying method, with the distribution of the components uniform.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of RDX/Aluminum Composites by Spray-Drying Method

Sun

et al. 2020

Journal of Nanomaterials

View full text Add to dashboard Cite

RDX/aluminum composites were prepared by the spray-drying method with F2602 as a binder. The morphology and covering effect of composites were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The effect of the processing parameters on the morphology of the samples was investigated. The impact sensitivity and thermal decomposition behavior of RDX/aluminum composites were also measured and analyzed. Optimal morphology of samples was achieved when the inlet temperature, nitrogen flow rate, and suspension feed flow rates were 80°C, 473 L·h-1, and 4.5 mL·min-1, respectively. In addition, RDX/aluminum composites with the same content were prepared by a coverage-mixing method for comparative analysis. Experimental results showed that the thermal sensitivity and the impact sensitivity of RDX/aluminum composites prepared by the spray-drying method were significantly lower than those of RDX/aluminum composites prepared by the coverage-mixing method.

show abstract

“…During the past decades, considerable work has been done to decrease the sensitivity of conventional high-energy explosives through exploring energetic cocrystals, − improving the particle size and morphology, − and preparing energetic composites. − It is an effective strategy to decrease the high-sensitivity explosives by cocrystallization to introduce low-sensitivity or non-explosive components to high-sensitivity explosives. Cocrystals can bring about a completely different packing model of explosive molecules and thus lead to an alteration of key properties including the density, melting point, sensitivity, and detonation performance .…”

Section: Introductionmentioning

confidence: 99%

“…During the past decades, considerable work has been done to decrease the sensitivity of conventional high-energy explosives through exploring energetic cocrystals, 2 − 5 improving the particle size and morphology, 6 − 9 and preparing energetic composites. 10 − 16 It is an effective strategy to decrease the high-sensitivity explosives by cocrystallization to introduce low-sensitivity or non-explosive components to high-sensitivity explosives.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Spherical HMX/DMF Solvates, Spherical HMX Particles, and HMX@NTO Composites: A Way to Reduce the Sensitivity of HMX

Zhao

Shen

et al. 2023

ACS Omega

View full text Add to dashboard Cite

To reduce the sensitivity of HMX (HMX = high-melting explosive� cyclotetramethylenetetranitramine), spherical HMX/DMF (DMF = dimethylformamide) solvates, spherical HMX particles, and HMX@NTO (NTO = 1,2,4-triazol-5-one) composites are prepared by crystallization. The structure and performance of spherical HMX crystals, HMX particles, and HMX@NTO composites are characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electron microscopy, differential scanning calorimetry, accelerating rate calorimetry, and mechanical sensitivity test. The results show that the space group of the spherical HMX/DMF solvate is R̅ 3c with the lattice parameters of a = 15.9159(4) Å, b = 15.9159(4) Å, and c = 30.5136(8) Å. The non-isothermal stability and adiabatic thermal stability of HMX/ DMF solvates are similar to those of HMX particles. The non-isothermal stability of HMX@NTO composites is lower than that of NTO and HMX particles, while the adiabatic thermal stability of HMX@NTO composites is higher than that of NTO but lower than that of HMX particles. The mechanical sensitivities of spherical HMX/DMF cocrystals, spherical HMX particles, and HMX@NTO composites are lower than that of raw HMX. This study can provide some guidance for desensitizing HMX and other energetic materials.

show abstract

Study on the Influencing Factors of Ultrafine Spherical RDX during Spray Drying with Low Speed

Cited by 11 publications

References 25 publications

Preparation, High-Density Spherical, and Low Sensitivity of RDX/NC/PMMA Composite Particles

Preparation, High-Density Spherical, and Low Sensitivity of RDX/NC/PMMA Composite Particles

Preparation and Properties of RDX/Aluminum Composites by Spray-Drying Method

Preparation of Spherical HMX/DMF Solvates, Spherical HMX Particles, and HMX@NTO Composites: A Way to Reduce the Sensitivity of HMX

Contact Info

Product

Resources

About