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Effect of Drying Conditions on the Characteristics and Performance of B/Fe2O3 Nano-Composites Prepared by Sol-Gel Method

Dinçer Yilmaz Nil Ezgi, Karakaş Gürkan

Central European Journal of Energetic Materials

2020

Vol. 17, no. 1

85--106

B/Fe2O3 samples were prepared by mixing nano sized boron powder with iron oxide xerogels that had been synthesized using a sol-gel method that included various types of proton scavengers such as 1,2-epoxybutane, tetrahydrofuran, 1,4-dioxane and ammonium hydroxide. The effects of the proton scavengers and drying conditions on the textural properties of the iron oxide samples and on the heat output and thermal behavior of the nano-composites were examined. The iron oxide samples were subjected to direct drying (DD) or sequential solvent exchange (SSE). The heat output values of the B/Fe2O3 nano-composites varied from 240 to 1200 J/g depending on the drying condition and the proton scavenger used. It was found that the thermal behaviour and the textural properties of B/Fe2O3 nano-composites (such as porosity, surface area and crystallinity) could be tailored by both the drying conditions and the proton scavenger used.

Extrudable Gassy Pyrotechnic Time Delay Compositions

Grobler J. M., Cowgill A. W., Focke W. W., Labuschagne G.

Central European Journal of Energetic Materials

2018

Vol. 15, no. 2

299--314

A copolymer of chlorotrifluoroethylene and vinylidene fluoride was investigated to assess its viability as an oxidiser, for aluminium as the fuel, in an extrudable pyrotechnic composition for application in 3D printing. Experimental results and EKVI thermochemical modelling suggested that a fuel loading of 30 wt.% would provide the maximum energy output. DTA and TGA analysis were performed in order to ascertain processing limits. With the addition of a processing aid LFC-1® samples could be extruded successfully. Printing with the compositions had limited success. The high melt viscosity paired with the filament’s susceptibility to excessive preheating caused the print quality to be low. Delamination did not occur due to good fusion achieved during layer deposition. With minor compositional adjustments printing quality could be improvedy.

Aluminium and zirconium powders as components of specialty pyrotechnics and rocket propellants

Czajka B., Pruchniak K., Wachowski L.

Materiały Wysokoenergetyczne

2012

T. 4

36--40

Methods of obtaining aluminium and zirconium powders, decisively infuencing their granulation and thickness of the passivation layer formed on the metal surface are discussed. Application of zirconium instead of aluminium can lead to ignition resulting from its high electrostatic discharge sensitivity. One of the ways to avoid this issue is to replace metallic zirconium with the ZrH2 powder or to coat its surface with aluminium.