Combustion Of Composites Of Boron With Bismuth And Cobalt Fluorides In Different Environments
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.
Recommended Citation
S. K. Valluri et al., "Combustion Of Composites Of Boron With Bismuth And Cobalt Fluorides In Different Environments," Combustion Science and Technology, vol. 193, no. 8, pp. 1343 - 1358, Taylor and Francis, Taylor and Francis Group, Jan 2021.
The definitive version is available at https://doi.org/10.1080/00102202.2019.1694920
Department(s)
Mechanical and Aerospace Engineering
Keywords and Phrases
burn rate; combustion temperature; fluorination; metal combustion; Reactive materials
International Standard Serial Number (ISSN)
1563-521X; 0010-2202
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2026 Taylor and Francis, Taylor and Francis Group, LLC, All rights reserved.
Publication Date
01 Jan 2021
Comments
Office of Naval Research, Grant N00014-19-1-2048