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International Journal of Energetic Materials and Chemical Propulsion
ESCI SJR: 0.28 SNIP: 0.421 CiteScore™: 0.9

ISSN Print: 2150-766X
ISSN Online: 2150-7678

International Journal of Energetic Materials and Chemical Propulsion

DOI: 10.1615/IntJEnergeticMaterialsChemProp.2013005043
pages 353-373

OXIDATION, IGNITION AND COMBUSTION OF AL-HYDROCARBON COMPOSITE REACTIVE POWDERS

Shasha Zhang
New Jersey Institute of Technology, Newark, NJ 07029 USA; Key Laboratory of Hydraulic Machinery Transients, MOE, Wuhan University, Wuhan, 430072, China; School of Power and Mechanical Engineering, Wuhan University, Wuhan, Hubei 430072, China
Mirko Schoenitz
New Jersey Institute of Technology, Newark, New Jersey 07102, USA
Edward L. Dreizin
New Jersey Institute of Technology, Newark, New Jersey 07102, USA; Tomsk State University, Tomsk, 634050, Russia

ABSTRACT

Metal fuel additives are used in advanced explosive formulations to achieve higher combustion temperatures and longer pressure pulses. Cryomilling is used to prepare Al-based reactive composites to replace pure Al as a fuel additive in explosives for multiple applications. In this project, Al-paraffin wax and Al-polyethylene composite materials were prepared and characterized. The prepared powders were initially evaluated using thermogravimetric analysis, scanning electron microscopy, and X-ray diffraction. Ignition temperatures of the prepared materials were determined at heating rates varied in the range of 2000-23000 K/s using an electrically heated filament. Materials were burned as individual particles and as aerosolized clouds. Ignition temperatures were significantly lower for all composite materials compared to pure Al. Single particle burn times were longer and combustion temperatures were comparable to those of pure Al powders. Combustion dynamics of the composite material particles was affected by the hydrocarbon additives retained in the material after its ignition despite the very high combustion temperatures. In aerosol combustion tests, the pressure for Al-hydrocarbon composites was negatively affected by strong agglomeration of the partially burned particles.


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