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Ignition and Combustion Behaviors of Nanocomposite Al/MoO3

  • John J. Granier (a1) and Michelle L. Pantoya (a1)

Abstract

Flame propagation in Al/MoO3 thermites is measured as a function of bulk density and initial sample temperature. The composites are composed of nano-scale reactant particles mixed and pressure molded to between 49 and 73% of the theoretical maximum density. A relationship between cylindrical die pressure and final pellet density is derived. Experiments are also performed by initially pre-heating samples to a uniform temperature ranging from 20 to 200 °C. Ignition sensitivity was determined by measuring the ignition delay time and temperature using a 50-W CO2 laser and thermocouples, respectively. Combustion wave speeds were measured using high-speed imaging diagnostics. Results allow comparison of combustion behaviors associated with nano- vs. micron-scale particle composites. The nano-scale particle composites are extremely sensitive to ignition, especially when initially preheated. Combustion wave speeds for the compressed nano-composites were found to double when compared to the micron-scale composites.

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References

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1. Bockmon, B. S., Pantoya, M. L., Son, S. F., Asay, B. W., Mang, J. T., Submitted to Combustion and Flame, 10/2003.
2. Granier, J. J. and Pantoya, M. L., Submitted to Combustion and Flame, June (2003).
3. Kwok, Q. S. M., Fouchard, R. C., Turcotte, A.-M., Lightfoot, P. D., Bowes, R., and Jones, D.E.G., Propellants, Explosives and Pyrotechnics, in press (2003).

Ignition and Combustion Behaviors of Nanocomposite Al/MoO3

  • John J. Granier (a1) and Michelle L. Pantoya (a1)

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