scholarly journals Coating and Characterization of Mock and Explosive Materials

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Emily M. Hunt ◽  
Matt Jackson
Keyword(s):  
Energetic Materials ◽  
Energetic Material ◽  
Precision Control ◽  
Explosive Materials ◽  
Coated Materials ◽  
Air Stream ◽  
High Bulk Density ◽  
Comprehensive Comparison ◽  
High Bulk

This project develops a method of manufacturing plastic-bonded explosives by using use precision control of agglomeration and coating of energetic powders. The energetic material coating process entails suspending either wet or dry energetic powders in a stream of inert gas and contacting the energetic powder with atomized droplets of a lacquer composed of binder and organic solvent. By using a high-velocity air stream to pneumatically convey the energetic powders and droplets of lacquer, the energetic powders are efficiently wetted while agglomerate drying begins almost immediately. The result is an energetic powder uniformly coated with binder, that is, a PBX, with a high bulk density suitable for pressing. Experiments have been conducted using mock explosive materials to examine coating effectiveness and density. Energetic materials are now being coated and will be tested both mechanically and thermally. This allows for a comprehensive comparison of the morphology and reactivity of the newly coated materials to previously manufactured materials.

Coating and Characterization of Energetic Materials

2010 ◽  
Author(s):  
Emily M. Hunt ◽  
Matt Jackson
Keyword(s):  
Energetic Materials ◽  
Energetic Material ◽  
Precision Control ◽  
Explosive Materials ◽  
Coated Materials ◽  
Air Stream ◽  
High Bulk Density ◽  
Comprehensive Comparison ◽  
High Bulk

This project develops a method of manufacturing Plastic Bonded Explosives by using use precision control of agglomeration and coating of energetic powders. The energetic material coating process entails suspending either wet or dry energetic powders in a stream of inert gas and contacting the energetic powder with atomized droplets of a lacquer composed of binder and organic solvent. By using a high velocity air stream to pneumatically convey the energetic powders and droplets of lacquer, the energetic powders are efficiently wetted while agglomerate drying begins almost immediately. The result is an energetic powder uniformly coated with binder; i.e., a PBX, with a high bulk density suitable for pressing. Experiments have been conducted using mock explosive materials to examine coating effectiveness and density. Energetic materials are now being coated and will be tested both mechanically and thermally. This allows for a comprehensive comparison of the morphology and reactivity of the newly coated materials to previously manufactured materials.

scholarly journals Nanostructured Energetic Materials with Sol-gel Methods

2003 ◽  
Vol 800 ◽  
Author(s):  
Alexander E. Gash ◽  
Joe H. Satcher ◽  
Randall L. Simpson ◽  
Brady J. Clapsaddle
Keyword(s):  
Thermal Properties ◽  
Energetic Materials ◽  
Energetic Material ◽  
Sol Gel ◽  
Small Scale ◽  
Fine Grained ◽  
Electron Microscopies ◽  
Burn Rate ◽  
Scanning Electron

AbstractThe utilization of sol-gel chemical methodology to prepare nanostructured energetic materials as well as the concepts of nanoenergetics is described. The preparation and characterization of two totally different compositions is detailed. In one example, nanostructured aerogel and xerogel composites of sol-gel iron (III) oxide and ultra fine grained aluminum (UFG Al) are prepared, characterized, and compared to a conventional micron-sized Fe2O3/Al thermite. The exquisite degree of mixing and intimate nanostructuring of this material is illustrated using transmission and scanning electron microscopies (TEM and SEM). The nanocomposite material has markedly different energy release (burn rate) and thermal properties compared to the conventional composite, results of which will be discussed. Small-scale safety characterization was performed on the nanostructured thermite. The second nanostructured energetic material consists of a nanostructured hydrocarbon resin fuel network with fine ammonium perchlorate (NH4ClO4) oxidizer present.

Theoretical Chemical Characterization of Energetic Materials

2005 ◽  
Vol 896 ◽  
Author(s):  
Betsy Mavity Rice ◽  
Edward F. C. Byrd
Keyword(s):  
Energetic Materials ◽  
Atomistic Simulation ◽  
State Of The Art ◽  
Energetic Material ◽  
Chemical Characterization ◽  
Theoretical Chemistry ◽  
Atomistic Simulations ◽  
Simulation Methods ◽  
Design Development

AbstractOur research is focused on developing computational capabilities for the prediction of properties of energetic materials associated with performance and sensitivity. Additionally, we want to identify and characterize the dynamic processes that influence conversion of an energetic material to products upon initiation. We are attempting to achieve these goals through the use of standard atomistic simulation methods. In this paper various theoretical chemistry methods and applications to energetic materials will be described. Current capabilities in predicting structures, thermodynamic properties, and dynamic behavior of these materials will be demonstrated. These are presented to exemplify how information generated from atomistic simulations can be used in the design, development, and testing of new energetic materials. In addition to illustrating current capabilities, we will discuss limitations of the methodologies and needs for advancing the state of the art in this area.

scholarly journals Synthesis and characterization of low density porous nickel zinc ferrites

RSC Advances ◽  
2019 ◽  
Vol 9 (23) ◽  
pp. 13173-13181 ◽  
Author(s):  
Qiushan Yu ◽  
Yuchang Su ◽  
Rabigul Tursun ◽  
Jing Zhang
Keyword(s):  
Soft Magnetic Materials ◽  
Synthesis And Characterization ◽  
Low Density ◽  
Porous Nickel ◽  
Soft Magnetic ◽  
Nickel Zinc ◽  
Zn Ferrite ◽  
High Bulk Density ◽  
High Bulk

Ni–Zn ferrite has important applications in the field of soft magnetic materials due to its excellent magnetic properties, but its high bulk density hinders its promotion.

Theoretical chemical characterization of energetic materials

2006 ◽  
Vol 21 (10) ◽  
pp. 2444-2452 ◽  
Author(s):  
Betsy M. Rice ◽  
Edward F.C. Byrd
Keyword(s):  
Energetic Materials ◽  
Atomistic Simulation ◽  
State Of The Art ◽  
Energetic Material ◽  
Chemical Characterization ◽  
Theoretical Chemistry ◽  
Atomistic Simulations ◽  
Simulation Methods ◽  
Design Development

Our research is focused on developing computational capabilities for the prediction of properties of energetic materials associated with performance and sensitivity. Additionally, we want to identify and characterize the dynamic processes that influence conversion of an energetic material to products upon initiation. We are attempting to achieve these goals through the use of standard atomistic simulation methods. In this paper, various theoretical chemistry methods and applications to energetic materials will be described. Current capabilities in predicting structures, thermodynamic properties, and dynamic behavior of these materials will be demonstrated. These are presented to exemplify how information generated from atomistic simulations can be used in the design, development, and testing of new energetic materials. In addition to illustrating current capabilities, we will discuss limitations of the methodologies and needs for advancing the state of the art in this area.

Toward reliable characterization of energetic materials: interplay of theory and thermal analysis in the study of the thermal stability of tetranitroacetimidic acid (TNAA)

2018 ◽  
Vol 20 (46) ◽  
pp. 29285-29298 ◽  
Author(s):  
Vitaly G. Kiselev ◽  
Nikita V. Muravyev ◽  
Konstantin A. Monogarov ◽  
Pavel S. Gribanov ◽  
Andrey F. Asachenko ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Quantum Chemistry ◽  
Energetic Materials ◽  
Energetic Material ◽  
Kinetics And Mechanism ◽  
Mechanism Of Thermal Decomposition ◽  
Thermal Stability Of

Kinetics and mechanism of thermal decomposition of tetranitroacetimidic acid, a novel green energetic material, were studied using complementary thermoanalytical methods (DSC and TGA) and quantum chemistry (CCSD(T)-F12).

Synthesis and Characterization of Nanocrystalline Oxidizer/Monopropellant Formulations

2003 ◽  
Vol 800 ◽  
Author(s):  
Thomas B. Brill ◽  
Bryce C. Tappan ◽  
Jun Li
Keyword(s):  
Energetic Materials ◽  
Freeze Drying ◽  
Energetic Material ◽  
Sol Gel ◽  
Impact Testing ◽  
Nano Particle ◽  
High Solids ◽  
Resorcinol Formaldehyde ◽  
Gel Processing

ABSTRACTThe objective of this work is to try to create new behaviors of energetic materials by using sol-gel processing and freeze drying to incorporate the energetic material into the fuel matrix at the nano particle size scale. Hydrazinium diperchlorate ([N2H6][ClO4]2) and resorcinol-formaldehyde were chosen in one example, and CL-20 and nitrocellulose were chosen in another. High solids loadings were achieved by the cryogel method. Characterization was carried out by elemental analysis, SEM, TEM, AFM, T-jump/FTIR spectroscopy, DSC, and drop-weight impact testing. The nanoscale formulations do indeed exhibit several different behaviors, such as enhanced burning characteristics and unusual morphologies, and appear to be a promising direction to pursue.

scholarly journals A potential subsurface cavity in the continuous ejecta deposits of the Ziwei crater discovered by the Chang’E-3 mission

2021 ◽  
Vol 73 (1) ◽  
Author(s):  
Chunyu Ding ◽  
Zhiyong Xiao ◽  
Yan Su
Keyword(s):  
Lunar Regolith ◽  
Lava Tubes ◽  
Impact Ejecta ◽  
Comprehensive Comparison ◽  
Ground Penetrating ◽  
Shallow Crust ◽  
Low Permittivity ◽  
Mare Basalts ◽  
Subsurface Cavities ◽  
High Bulk

AbstractIn the radargram obtained by the high-frequency lunar penetrating radar onboard the Chang’E-3 mission, we notice a potential subsurface cavity that has a smaller permittivity compared to the surrounding materials. The two-way travel time between the top and bottom boundaries of the potential cavity is ~ 21 ns, and the entire zone is located within the continuous ejecta deposits of the Ziwei crater, which generally have similar physical properties to typical lunar regolith. We carried out numerical simulations for electromagnetic wave propagation to investigate the nature of this low-permittivity zone. Assuming different shapes for this zone, a comprehensive comparison between our model results and the observed radargram suggests that the roof of this zone is convex and slightly inclined to the south. Modeling subsurface materials with different relative permittivities suggests that the low-permittivity zone is most likely formed due to a subsurface cavity. The maximum vertical dimension of this potential cavity is ~ 3.1 m. While the continuous ejecta deposits of Ziwei crater are largely composed of pre-impact regolith, competent mare basalts were also excavated, which is evident by the abundant meter-scale boulders on the wall and rim of Ziwei crater. We infer that the subsurface cavity is supported by excavated large boulders, which were stacked during the energetic emplacement of the continuous ejecta deposits. However, the exact geometry of this cavity (e.g., the width) cannot be constrained using the single two-dimensional radar profile. This discovery indicates that large voids formed during the emplacement of impact ejecta should be abundant on the Moon, which contributes to the high bulk porosity of the lunar shallow crust, as discovered by the GRAIL mission. Our results further suggest that ground penetrating radar is capable of detecting and deciphering subsurface cavities such as lava tubes, which can be applied in future lunar and deep space explorations.

Introduction of the acylamino group to bridged bis(nitroamino-1,2,4-triazole): a strategy for tuning the sensitivity of energetic materials

2021 ◽  
Vol 45 (38) ◽  
pp. 18059-18064
Author(s):  
Dongxu Chen ◽  
Jiangshan Zhao ◽  
Hongwei Yang ◽  
Hao Gu ◽  
Guangbin Cheng
Keyword(s):  
Energetic Materials ◽  
Energetic Material

Introduction of the acylamino group into energetic material compounds will contribute to balancing the sensitivity and the energy.

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