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Abstract
The total burning time of amorphous boron powder has been measured in premixed laminar boron-propane-oxygen-nitrogen flames at atmospheric pressure. The variation of burning time with initial oxygen partial pressure has been described by first-order combustion kinetics with due consideration for oxygen depletion during burn-out. Measured burning times are clonsistent with those reported previously for both single crystalline boron particles and amorphous boron agglomerates. Attempts to establish boron-oxygen flames indicate extremely slow flame propagation in the absence of added hydrocarbon.