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ISSN Imprimir: 2150-766X
ISSN On-line: 2150-7678
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MEASUREMENT OF THE BURNING VELOCITY OF Al-MoO3 POWDER MIXTURES
RESUMO
This paper reports measurements of the burning velocity of powder mixtures of aluminium and molybdenum trioxide in nitrogen at atmospheric pressure. The burning wave was detected by measuring the electric resistance of two wires laying on the specimen surface, separated by a known distance. Analysis of video recordings of the burn provided an additional measure of the burning velocity. Specimens were prepared by pressing the powder mixture at 296 MPa. The specimens were prism-like with dimensions of 80.4 by 8.15 by approximately 3.5 mm. Stoichiometric mixtures diluted with alumina were prepared, plus one rich, undiluted mixture. Six dilution compositions were tested: 0.0, 9.3, 13.4, 17.1, 23.6 and 30.5 mass percent alumina. The rich mixture had an equivalence ratio of 1.71. Burning velocity of the stoichiometric mixtures decreased almost linearly with dilution, going from 12.8 mm/s for undiluted to 4.2 mm/s for maximum dilution. Burning speed for the rich, undiluted mixture was 36.3 mm/s. The reaction produced a large quantity of gases, which scattered the products of the undiluted mixtures. Analysis of the recovered products showed the existence of aluminates, and besides alumina, molybdenum and molybdenum oxides.