The effect of Si-Bi2O3 on the ignition of the Al-CuO thermite

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Authors

Ilunga, K.
Del Fabbro, Olinto
Yapi, L.
Focke, Walter Wilhelm

Journal Title

Journal ISSN

Volume Title

Publisher

Elsevier

Abstract

The ignition temperature of the Al–CuO thermite was measured using DTA at a scan rate of 50 °C min−1 in a nitrogen atmosphere. Thermite reactions are difficult to start as they require very high temperatures for ignition, e.g. for Al–CuO thermite comprising micron particles it is ca. 940 °C. Itwas found that the ignition temperature is significantly reduced when the binary Si–Bi2O3 system is added as sensitizer. Further improvement is achieved when the reagents are nano-sized powders. For the composition Al+CuO+Si+Bi2O3 (65.3:14.7:16:4 wt.%), with all components nano-sized, the observed ignition temperature is ca. 613 °C and a thermal runaway reaction is observed in the DTA.

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Keywords

Pyrotechnics, Thermite, Ignition temperature, Nanoparticles

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Citation

Ilunga, K, Del Fabbro, O, Yapi, L & Focke, WW 2011, 'The effect of Si-Bi2O3 on the ignition of the Al-CuO thermite', Powder Technology, vol. 205, no. 1-3, pp. 97-102. [http://www.elsevier.com/locate/powtec]