Computational and Theoretical Analysis of the Effect of an Aluminum Borate Oxide Film on the Ignition Conditions of Single Aluminum Diboride Particles
A. M. Savel'ev1,2, N. S. Titova1
1Baranov Central Institute of Aviation Motors, Moscow, 111116 Russia
2Bauman Moscow State Technical University, Moscow, 105005 Russia
Keywords: aluminum borides, high-energy compositions, ignition
Abstract
Thermogravimetric analysis data were used to determine the activation energy E = 205.9 kJ/mol, the pre-exponential factor A = 2.275 x 10-15 m3/s, and the order of the reaction with respect to the oxidizer m = 1 for the oxidation of an aluminum diboride particle leading to the formation of aluminum borate on the surface. The ignition conditions for a single particle of aluminum diboride in air were estimated using the theory of ignition of metal particles proceeding by the thermal explosion mechanism. It is shown that a consequence of the formation of aluminum borates in the induction period is a strong positive dependence of the ignition temperature of particles on their size and the partial pressure of oxygen.
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