Formation of Tungsten/Ammonium Perchlorate Composites and Their Reaction Kinetics

• Autorzy: Shim H.-M. , Lee E.-A. , Kim J.-K. , Kim H.-S. , Koo K.-K.
• Języki publikacji: EN

Abstrakty

EN

The reaction kinetics of tungsten nanoparticles/ammonium perchlorate (W/AP) composites, produced by a spray drying technique, were analyzed and compared with those of neat AP particles and aluminum nanoparticles/AP (Al/AP) composites. The W was found to raise the onset temperature of the thermal decomposition of AP by increasing the activation energy, whereas Al conversely lowered the onset temperature of AP due to the decreased activation energy. From the master plots of kinetic models with the experimental data, the Prout-Tompkins model and the 1-D diffusion controlled model were found to describe the low-temperature decomposition (LTD) and high-temperature decomposition (HTD), respectively, giving remarkable agreement with experimental curves for all heating rates. The presence of W was found to increase the HTD zone width compared with that of neat AP particles and Al/AP composites. Analysis of the average activation energy and pre-exponential factor showed that W increases the energy barrier and the frequency of occurrence of the reaction compared with that of neat AP particles at the LTD state, whereas W decreases both of them at the HTD state. The effect of Al was also shown to be similar to that of W, but the magnitudes of the variation in activation energy and the pre-exponential factor were relatively small.

Słowa kluczowe

EN

ammonium perchlorate; composite; thermal decomposition

• Czasopismo: Central European Journal of Energetic Materials
• Rocznik: 2015
• Tom: Vol. 12, no. 4
• Strony: 703--722
• Opis fizyczny: Bibliogr. 30 poz., rys., tab.

Twórcy

autor

Shim H.-M.

• Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 121-742, Korea

autor

Lee E.-A.

• Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 121-742, Korea

autor

Kim J.-K.

• Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 121-742, Korea

autor

Kim H.-S.

• Agency for Defense Development, Daejeon, 305-600, Korea

autor

Koo K.-K.

• Department of Chemical and Biomolecular Engineering, Sogang University, Seoul, 121-742, Korea

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