Effect of boron content in B·BiF3 and B·Bi composites on their ignition and combustion

Document Type

Article

Publication Date

5-1-2020

Abstract

Composite powders combining boron with BiF3 and Bi in different amounts were prepared by high energy milling. Thermal analysis in an argon-oxygen mixture showed significant oxidation starting about 200 K lower than for pure boron. Selective oxidation of metallic Bi at low temperatures was observed. Composites containing either Bi or BiF3 ignited more readily than pure boron when heated by a CO2 laser beam. The composites containing BiF3 ignited more readily than boron when in contact with a hot wire. Burn times of particles aerosolized in air and ignited using the CO2 laser were measured as durations of the recorded emission pulses produced by burning particles. Statistical distributions of the measured burn times were correlated with the respective powder's particle size distributions. Compared to elemental boron, burn times of all prepared composites were shorter, including those containing only 10 wt.% of BiF3 or ca. 8 wt.% of Bi, and for most composites combustion temperatures were higher.

Identifier

85079046080 (Scopus)

Publication Title

Combustion and Flame

External Full Text Location

https://doi.org/10.1016/j.combustflame.2020.01.026

e-ISSN

15562921

ISSN

00102180

First Page

78

Last Page

85

Volume

215

Grant

N00014-19-1-2048

Fund Ref

Office of Naval Research

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