Aluminum-rich Al-MoO3 nanocomposite powders prepared by arrested reactive milling

Document Type

Conference Proceeding

Publication Date

1-1-2008

Abstract

Fuel-rich Al-MoO3 nanocomposites were prepared using arrested reactive milling. Powder composition was varied from 4Al + MoO3 to 16Al + MoO3. Powders were evaluated using electron microscopy, thermal analysis, x-ray diffraction, heated-filament-ignition experiments, and constant-volume-explosion experiments. Uniform mixing of MoO3 nanodomains in the aluminum matrix was achieved for all prepared powders. Multiple and overlapping exothermic processes were observed to start when the nanocomposite powders were heated to only about 350 K. In heated-filament experiments, all nanocomposite powders ignited at temperatures well below the aluminum melting point. Ignition temperatures for these powders were estimated for the higher heating rates that are typical of fuel-air explosions. Constant-volume-explosion experiments indicated that flame propagation in aerosols of nanocomposite thermite powders in air is much faster than that in pure aluminum aerosols. The energy release, normalized per unit mass of aluminum, was higher for the nanocomposite materials with bulk compositions 4Al + MoO3 and 8Al + MoO3 and lower for pure aluminum and for the 16Al + MoO3 nanocomposite sample. The reaction rate was the highestforthe8Al + MoO3 nanocomposite powder. The combustion efficiency inferred from the measured pressure traces correlated well with the phase compositions of the analyzed condensed combustion products. Copyright © 2007 by the American Institute of Aeronautics and Astronautics, Inc.

Identifier

43649106826 (Scopus)

Publication Title

Journal of Propulsion and Power

External Full Text Location

https://doi.org/10.2514/1.31762

e-ISSN

15333876

ISSN

07484658

First Page

192

Last Page

198

Issue

2

Volume

24

Grant

DAAE30-1-9-0080

Fund Ref

Defense Threat Reduction Agency

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