At ambient temperatures below the boiling point of B203, the condensed oxide will be a product of boron combustion. Some qualitative effects that are expected to be associated with the presence of a condensed product have been investigated using a simplified combustion model. Liquid B2O3 may be present as a film on the particle surface or as a fog detached from the particle surface. Its presence as a film on the particle surface would inhibit the oxidation process. Model calculations suggest that combustion through an oxide film is to be expected for large particles at moderate oxygen concentrations. For such particles, it is expected that there would be a dramatic change in the surface temperature and burning rate as the particle is consumed. The surface temperature of the boron particle is influenced by whether the product is gaseous or condensed.
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