Formation and characterization of core-shell CL-20/TNT composite prepared by spray-drying technique

Song, Changgui; Li, Xiaodong; Yang, Yourong; Liu, Huimin; Tan, Yingxin; Wang, Jingyu

doi:10.1016/j.dt.2020.12.005

Cited by 26 publications

(5 citation statements)

References 35 publications

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“…In this work, we investigate the use of recrystallization and spray drying as a technique to process TNT powder with unique morphologies and molecular purity. Spray drying has commonly been used as a controlled powder processing and microencapsulation technology for the pharmaceutical and food industries. − In recent years, the spray-drying technology has been adopted in the HE and energetic material community for the development of nanocrystals of HE materials, − as well as a one-step process for existing and novel energetic composites. − Investigation of the spray-dried TNT produced in this work revealed interesting changes in physical and chemical properties of the reprocessed powder. These include a unique morphology of TNT as compared to other synthesis methods, where the particle sizes produced by spray drying are significantly smaller than particles from many solution-based crystallization techniques .…”

Section: Introductionmentioning

confidence: 89%

Investigation of Physical and Chemical Properties of TNT after Spray Drying

Tisdale

Freye

Cleveland

et al. 2023

Crystal Growth & Design

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2,4,6-Trinitrotoluene (TNT) is a common insensitive energetic material for a variety of applications. Previous studies on TNT have revealed a complex nature of the material in terms of physical and chemical properties. We demonstrate the use of recrystallization and spray drying of TNT to produce a unique particle morphology with high purity and investigate important changes in the physical and chemical properties. We observed that spray drying of TNT fully isolated the less stable orthorhombic crystalline phase, following Ostwald’s rule of stages, due to the fast precipitation time and elevated temperature of the process. We also showed that spray drying removes some of the low-boiling point synthesis impurities from crude TNT. However, recrystallization in solution prior to spray drying was necessary to produce a high purity TNT after spray drying.

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Section: Introductionmentioning

confidence: 89%

Investigation of Physical and Chemical Properties of TNT after Spray Drying

Tisdale

Freye

Cleveland

et al. 2023

Crystal Growth & Design

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“…[17] In addition, the components of the core-shell composite could complement each other to obtain excellent performance. [18,19] Qin et al [20] coated polydopamine (PDA) on the α-AlH 3 surface through simple situ polymerization and the PDA could effectively prevent the reaction of α-AlH 3 with water and also made the thermal stability of α-AlH 3 increase significantly. The composite of ammonium perchlorate (AP) with α-AlH 3 effectively improved its stability and increased the dehydrogenation induction time of α-AlH 3 by 1.2 times.…”

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH₃ Composites by Solvent/Anti‐solvent Method

Shi

et al. 2023

ChemNanoMat

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Alpha-aluminum hydride (α-AlH 3 ) is an ideal energetic combustion agent, but its poor stability and safety limit its application. Therefore, we prepare different composites by using the solvent/anti-solvent method to coat different pyrotechnic binders on the surface of α-AlH 3 . The vacuum stability test show that the minimum outgassing of Shellac-coated α-AlH 3 composite is only 1.2 mL/g at 50 °C for 6 days. Due to the good electrical insulation properties of Viton, Viton-coated α-AlH 3 composite have the highest E 50 value of electrostatic sensitivity. In addition, the pyrotechnic binders coating not only protects the activity of the α-AlH 3 but also effectively increases its burning rate. Viton-coated α-AlH 3 composite have more gaseous products and maximum flame area during combustion. This study illustrates that α-AlH 3 coated with pyrotechnic binders is a means to address its stability and safety, laying the foundation for its application in solid propellants.

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“…Additive manufacturing techniques, including stereolithography, direct ink writing, and fused deposition modeling [6][7][8][9] present new possibilities for EM manufacturing [7,[10][11][12][13]. The ability to control geometric features and grain gradients allows for customization of run distance, shock propagation, and shockto-detonation transition rates [14], enabling unique detonation and other energetic performance effects [15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Pressure‐assisted binder jetting for additive manufacturing of mock energetic composites

Kirby,

Udaykumar,

Song

2023

Propellants Explo Pyrotec

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Additive manufacturing (AM) has emerged as a promising approach to achieve energetic materials (EMs) with intricate geometries and controlled microstructures, which are crucial for safety and performance optimization. However, current AM methods still face limitations such as limited densities and inadequate solids loading. To overcome these limitations, we have developed a pressure‐assisted binder jet (PBJ) process that has the potential to allow for the fabrication of intricate EMs while preserving their desired properties. This study aims to investigate the effects of printing parameters on the microstructures and properties of EMs, including density, solids loading, mechanical properties, and heterogeneity. Our results demonstrate that the PBJ process achieves exceptional properties in EMs, including densities up to 83.4 % and solids loading up to 95.4 %, surpassing those achieved by existing AM processes. Furthermore, the mechanical properties of the fabricated EMs are comparable to those achieved using conventional fabrication techniques, including a compressive strength of 3.32 MPa, a Young's modulus of 16.68 MPa, a Poisson's ratio of 0.45, a shear modulus of 5.73 MPa, and a bulk modulus of 21.01 GPa. Various test cases were printed to showcase the ability of the PBJ process to create EMs with complex structures and exceptional properties. Micro‐computed tomography was employed to analyze the influence of printing parameters on the internal composition and microstructures of the printed specimens.

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Formation and characterization of core-shell CL-20/TNT composite prepared by spray-drying technique

Cited by 26 publications

References 35 publications

Investigation of Physical and Chemical Properties of TNT after Spray Drying

Investigation of Physical and Chemical Properties of TNT after Spray Drying

Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH₃ Composites by Solvent/Anti‐solvent Method

Pressure‐assisted binder jetting for additive manufacturing of mock energetic composites

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Formation and characterization of core-shell CL-20/TNT composite prepared by spray-drying technique

Cited by 26 publications

References 35 publications

Investigation of Physical and Chemical Properties of TNT after Spray Drying

Investigation of Physical and Chemical Properties of TNT after Spray Drying

Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH3 Composites by Solvent/Anti‐solvent Method

Pressure‐assisted binder jetting for additive manufacturing of mock energetic composites

Contact Info

Product

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Preparation and Properties of Pyrotechnic Binder Encapsulated α‐AlH₃ Composites by Solvent/Anti‐solvent Method