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379 Newest Publications in propellants, explosives, pyrotechnics

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Flameless Combustion Synthesis of Ni and Ag Nanoparticles in Ballasted Systems: A Time‐Resolved X‐ray Diffraction Study

25-06-2014 | Yurii M. Mikhailov, Victor V. Aleshin, Alexandra M. Kolesnikova, Dmitrii Yu. Kovalev, Vasilii. I. Ponomarev, Propellants, Explosives, Pyrotechnics, 2014

Abstract The combustion of cellulose nitrate in ballasted mixtures containing an organic binder and nickel hydroxycarbonate or silver carbonate as precursors resulted Ni or Ag nanoparticles. The formation of Ni and Ag nanoparticles from flameless combustion of cellulose nitrate was monitored ...

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Synthesis, Characterization, and Combustion Catalytic Activities of Copper(II) and Lead(II) Salts of p‐Nitrocalix[n]arenes (n=4, 6, 8)

25-06-2014 | Guofang Zhang, Chunyan Wang, Ting An, Fengqi Zhao, Xuezhong Fan, Propellants, Explosives, Pyrotechnics, 2014

Abstract Six copper(II) and lead(II) salts of p‐nitrocalix[n]arene (n=4, 6, 8) were synthsized and characterized. The DSC curves of all salts showed exothermic decomposition. Sensitivity studies revealed that all the salts with the exception of the lead salt of p‐nitrocalix[6]arene (NCPb6) are ...

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[Hmim][HSO4], a Green and Recyclable Acidic Ionic Liqiud Medium for the One‐pot Nitration of TADB to HNIW

25-06-2014 | Yadollah Bayat, Mohammad Mahdi Ahari‐Mostafavi, Narges Hasani, Propellants, Explosives, Pyrotechnics, 2014

Abstract An efficient and mild procedure for the one‐pot preparation of CL‐20 from TADB in the presence of the Brønsted acidic ionic liquid 1‐methylimidazolium hydrogen sulfate [Hmim][HSO4] as catalyst was developed. The ionic liquid was stable during the reaction process and could also be ...

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Bishydrazinium and Diammonium Salts of 4,4′,5,5′‐Tetranitro‐2,2′‐biimidazolate (TNBI): Synthesis and Properties

20-06-2014 | Alexander J. Paraskos, Edward D. Cooke, Kelley C. Caflin, Propellants, Explosives, Pyrotechnics, 2014

Abstract The diammonium (1) and bishydrazinium (2) salts of 4,4′,5,5′‐tetranitro‐2,2′‐biimidazolate (TNBI) were synthesized and their physical properties as well as predicted explosive performance characteristics are described. These dianionic salts are easily formed in good yields by reaction ...

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Ammonium Perchlorate, Friend or Foe?

20-06-2014 | Ruth Tunnell, Mark Ashcroft, Roz Dale, Dave Tod, William G. Proud, Propellants, Explosives, Pyrotechnics, 2014

Abstract In part 1 of this paper, it was demonstrated that a nitroglycerine and polyethylene glycol based propellant containing ammonium perchlorate degraded at a slower rate at temperatures of 80 °C or less compared with the other two energetic materials studied which did not have this ...

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Modeling Ignition and Thermal Wave Progression in Binary Granular Pyrotechnic Compositions

11-06-2014 | Sebastian Knapp, Volker Weiser, Stefan Kelzenberg, Norbert Eisenreich, Propellants, Explosives, Pyrotechnics, 2014

Abstract Oxidizer and fuel particles are the ingredients of classical pyrotechnics. Particle concentration, size, melting, evaporation, and decomposition of the particles, heat and mass transfer, reaction kinetics, and heat of reaction control the burning behavior of these mixtures. A hot‐spot ...

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A New Computer Code for Prediction of Enthalpy of Fusion and Melting Point of Energetic Materials

02-06-2014 | Mohammad Hossein Keshavarz, Propellants, Explosives, Pyrotechnics, 2014

Abstract The prediction of phase change properties of energetic materials is important for the assessment of hazardous energetic materials. A novel user‐friendly computer code, written in Visual Basic, is introduced to predict the melting point and the enthalpy of fusion of energetic materials ...

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The Effects of Yield Stress and Casing Thickness on Blast Impulse and Fragment Velocity

02-06-2014 | Michael D. Hutchinson, Propellants, Explosives, Pyrotechnics, 2014

Abstract A previous paper by the author [1] showed how his equation [2], based on the model first proposed by Gurney [3] for the blast impulse from cased munitions, can be modified to allow for the yield stress of the casing metal. This paper [1] also provided validation for this further ...

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Expansion Behavior and Temperature Mapping of Thermites in Burn Tubes as a Function of Fill Length

28-05-2014 | John M. Densmore, Kyle T. Sullivan, Alexander E. Gash, Joshua D. Kuntz, Propellants, Explosives, Pyrotechnics, 2014

Abstract The reaction of loosely‐packed aluminum/copper oxide (Al/CuO) thermites in a 12 cm long acrylic burn tube was investigated as a function of the fill length from 2 to 10 cm. The velocity of the luminous front was measured both in the filled and unfilled region, and approached ...

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Regression Rate Studies of Paraffin Wax‐HTPB Hybrid Fuels Using Swirl Injectors

28-05-2014 | Rakesh Sakote, Narendra Yadav, Srinibas Karmakar, Puran Chand Joshi, Ashwini Kumar Chatterjee, Propellants, Explosives, Pyrotechnics, 2014

Abstract Studies on the regression rates of three compositions of paraffin wax‐HTPB hybrid fuel grains in a stream of gaseous oxygen using two different swirl injectors at a fixed injection pressure were carried out. It was found that the regression rate in the hybrid fuel increases with ...

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