Reactivity regulation of B/KNO3/PVDF energetic sticks prepared by direct ink writing

Li, Chenyang; Song, Haoyu; Xu, Chuanhao; Li, Chunyan; Jing, Jianquan; Ye, Baoyun; Wangf, Jingyu; An, Chongwei

doi:10.1016/j.cej.2022.138376

Cited by 14 publications

(2 citation statements)

References 57 publications

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“…XRD tests were performed on the raw materials and the BPN samples. All diffraction peaks of the BPN system matched well with the standard card, indicating that the crystals in both the premixed and postmixed samples are KNO 3 because amorphous B does not have crystal properties, 54 as shown in Figure 5a.…”

Section: Bpn Morphology Under Different Component Concentrationsmentioning

confidence: 70%

Construction of Ultra-Mixed Energetic Composite Systems by Micro Continuous Flow Coupled with Spray Drying Technology

Liu,

Fei,

Zhou

et al. 2024

Ind. Eng. Chem. Res.

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Improving the quality of mixing between multiple components is expected to enhance the macroscopic performance of the composite energetic materials. To address the limitations associated with intermittent manual techniques in multicomponent mixing, a novel strategy that integrates microfluidic with spray drying technology was proposed to achieve the safe and continuous fabrication of ultramixed energetic composites. B/KNO 3 was utilized as a representative example to validate the applicability of this strategy. This strategy allows for the simultaneous refinement of raw materials and assembly of multicomponent microscale interfaces, enabling a "one-step" synthesis approach. A microscale assembly model for composite components was constructed and applied to describe the microscopic morphology of the composite particles under different conditions. The microscopic morphology of B/KNO 3 was analyzed under different component concentrations, drying temperatures, and gas flow rates to validate the applicability of the model. Based on the TG−DSC results, a qualitative explanation was provided for the relationship between the microstructural configuration of the composite system and its macroscopic thermal performance when the B/KNO 3 ratio is constant. In addition, laser ignition experiments were conducted to evaluate the combustion characteristics of the ultramixed B/KNO 3 . Encouragingly, the quality of interfacial composite materials plays a crucial role in influencing the macroscopic reactivity, as the ultramixed B/KNO 3 exhibits consistent burning rates and high delay accuracy. The proposed micro continuous flow-spray strategy not only offers novel insights into modulating the macroscopic performance of composite energetic materials through enhanced interfacial blending but also provides valuable references for the continuous fabrication of other composite materials. Moreover, this strategy prioritizes intrinsic safety aspects and effectively addresses pertinent concerns associated with the handling and processing of energetic materials.

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Section: Bpn Morphology Under Different Component Concentrationsmentioning

confidence: 70%

Construction of Ultra-Mixed Energetic Composite Systems by Micro Continuous Flow Coupled with Spray Drying Technology

Liu,

Fei,

Zhou

et al. 2024

Ind. Eng. Chem. Res.

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“…Recently, polyvinylidene fluoride (PVDF) has attracted researchers’ attention in the application as a binder in composite particles. It is used to coat aluminum powder [ 19 ], B/KNO 3 [ 20 ], Al/Fe 2 O 3 [ 21 ], Al/CuO/RDX [ 22 ], etc. Herein, PVDF was selected to be the coating layer because of its characteristics of corrosion resistance, high temperature resistance, oxidation resistance, and a strong hydrogen bond [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Core-Shell-Structured RDX@PVDF Microspheres with Improved Thermal Stability and Decreased Mechanical Sensitivity

Wu¹,

Jiang²,

et al. 2022

Polymers

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Reducing the sensitivity of high-energy simple explosives is the key technology in improving the practical application of high-energy insensitive powder. As the most widely used high-energy explosive, hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX) is limited in application due to its high sensitivity. In this work, polyvinylidene fluoride (PVDF) was used as an energetic binder. Core-shell-structured RDX@PVDF microspheres are produced using electrospray assembly technology and fully characterized by thermogravimetric analysis, X-ray diffraction, scanning electron microscopy, transmission electron microscopy, energy dispersive spectroscopy, and mechanical sensitivity. Their thermal stability and mechanical sensitivity are directly related to the weight fraction of the added PVDF. Moreover, core-shell-structured RDX@PVDF microspheres with RDX and PVDF in the proportion three to one possess a spherical-like morphology, the lowest impact sensitivity, the lowest friction sensitivity, and the highest thermal stability. This work provides a facile method for the positive design energetic materials and the prediction of their environmental adaptability.

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Preparation and characteristics of boron‐based composite micro‐units encapsulated by potassium perchlorate

Qin,

Liu,

Zeng

et al. 2024

Propellants Explo Pyrotec

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To improve the ignition and combustion performance of boron (B), the B@ potassium perchlorate (KP) composite micro‐units are successfully prepared by recrystallization of solvent evaporation. The morphology and structural composition show that B@KP composite micro‐units are formed by the gentle recrystallization of KP at the heterogeneous interface between B particles and solvents. It is shown by thermal analysis that the initial thermal decomposition temperature of KP is reduced by 49 °C due to the reduction of particle size. In addition, the heat of 420 J/g released by the thermal decomposition of KP is beneficial to the evaporation of the oxide boron (B2O3) film on the surface of B, which reduces the initial oxidation temperature of B by 185 °C and improves the ignition performance of B. Interestingly, the oxygen (O2) released by the thermal decomposition of KP quickly reacts with B to release heat of 3608 J/g, which improves the combustion performance of B. The optimal mass ratio of B to KP is 1: 5, which results in the ignition delay time of 641 ms, a reduction of 19 ms compared to the physical mixed sample. The ignition delay times of other samples are 724 ms, 680 ms and 650 ms respectively, and B could not be ignited successfully. In the combustion process, all samples emit a bright green flame of B combustion, and even a fierce combustion flame like a mushroom cloud appears. In a word, the B@KP composite micro‐units have great potential for application in solid propellants.

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Reactivity regulation of B/KNO3/PVDF energetic sticks prepared by direct ink writing

Cited by 14 publications

References 57 publications

Construction of Ultra-Mixed Energetic Composite Systems by Micro Continuous Flow Coupled with Spray Drying Technology

Construction of Ultra-Mixed Energetic Composite Systems by Micro Continuous Flow Coupled with Spray Drying Technology

Preparation of Core-Shell-Structured RDX@PVDF Microspheres with Improved Thermal Stability and Decreased Mechanical Sensitivity

Preparation and characteristics of boron‐based composite micro‐units encapsulated by potassium perchlorate

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