Combustion of Composites of Boron with Bismuth and Cobalt Fluorides in Different Environments

Document Type

Article

Publication Date

1-1-2021

Abstract

Composite powders of boron and 50 wt-% of either bismuth or cobalt fluoride were prepared by arrested reactive milling. Particle combustion was studied in air, and in the products of air-hydrogen and air-acetylene flames, respectively. Combustion times, determined from 700 to 800 nm emission pulses, were correlated with particle sizes. Combustion temperatures were determined for select cases. In air, the composite particles burned faster than elemental boron with comparable combustion temperatures. However, the composite particles burned in one stage unlike the two-stage combustion pattern known for boron. In flame combustion products, the composite powders burned more slowly than elemental boron, but also in a single stage. Light emission was reduced compared to combustion in air, suggesting lower temperatures. Across all conditions, the B·BiF3 composites had shorter burn times compared to B·CoF2. Washing boron in acetonitrile prior to composite preparation to remove surface oxide/hydroxide had no significant effect on the combustion of the resulting composites.

Identifier

85075437644 (Scopus)

Publication Title

Combustion Science and Technology

External Full Text Location

https://doi.org/10.1080/00102202.2019.1694920

e-ISSN

1563521X

ISSN

00102202

First Page

1343

Last Page

1358

Issue

8

Volume

193

Grant

N00014-19-1-2048

Fund Ref

Office of Naval Research

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