Aluminum and Boron Ignition Intensification
F. K. Bulanin1,2, A. E. Sidorov1,2, N. I. Poletaev1,2, M. A. Starikov1,2, V. G. Shevchuk1,2
1Odessa I. I. Mechnikov National University, Odessa, 65082 Ukraine
2Institute of Combustion and Unconventional Technologies, Odessa, 65082 Ukraine
Keywords: boron, aluminum, mechanical mixtures of metals, air suspension, conglomerates, critical ignition temperatures, additives
Abstract
Effect of K2CO3 and KCl additives on the process of high-temperature oxidation and ignition of conglomerates of powdered boron and aluminum particles and on the critical conditions for the ignition of air-gas mixtures of these metals is studied experimentally. It is revealed that the mixtures of boron and aluminum particles covered (encapsulated) with salts ignite at temperatures lower than the ignition temperatures of mechanical mixtures of metals with these salts in appropriate proportions and significantly lower ignition temperatures of pure boron and aluminum. This indicates the active role of salts in the process of heterogeneous ignition. It is established that, for boron conglomerates, the accelerating effect of salt additives on the oxidation of conglomerates is noticeable at all investigated concentrations and compositions starting from 1 % (by weight). For aluminum, an increase in the reaction rate is noticeable only for KCl additives at concentrations of 3 % and above.
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