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Thermite combustion enhancement resulting from biomodal luminum distribution [electronic resource].

Published:
Washington, D.C. : United States. Dept. of Energy, 2004.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy
Physical Description:
9 pages : digital, PDF file
Additional Creators:
Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
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Summary:
In recent years many studies that incorporated nano-scale or ultrafine aluminum (Al) as part of an energetic formulation and demonstrated significant performance enhancement. Decreasing the fuel particle size from the micron to nanometer range alters the material's chemical and thermal-physical properties. The result is increased particle reactivity that translates to an increase in the combustion wave speed and ignition sensitivity. Little is known, however, about the critical level of nano-sized fuel particles needed to enhance the performance of the energetic composite. Ignition sensitivity and combustion wave speed experiments were performed using a thermite composite of Al and MoO3 pressed to a theoretical maximum density of 50% (2 g/cm3). A bimodal Al particle size distribution was prepared using 4 or 20 μm Al fuel particles that were replaced in 10% increments by 80 nm Al particles until the fuel was 100% 80 nm Al. These bimodal distributions allow the unique characteristics of nano-scale materials to be better understood. The pellets were ignited using a 50W CO2 laser. High speed imaging diagnostics were used to measure the ignition delay time and combustion wave speed.
Report Numbers:
E 1.99:la-ur-04-2949
la-ur-04-2949
Subject(s):
Note:
Published through SciTech Connect.
01/01/2004.
"la-ur-04-2949"
Submitted to 31st International Pyrotechnics Seminar, Fort Collins, CO, July 11-16, 2004.
Moore, K. M. (Kevin M.); Pantoya, M. (Michelle); Son, S. F. (Steven F.).
View MARC record | catkey: 23781376