Comparative Analysis of Boron Powders Obtained by Various Methods. I. Microstructure and Oxidation Parameters During Heating
A. N. Pivkina1, N. V. Murav’yov1, K. A. Monogarov1, D. B. Meerov1, I. V. Fomenkov2, E. A. Skryleva3, M. Yu. Presnyakov4, A. L. Vasil’ev4, N. I. Shishov5, Yu. M. Milyokhin5
1Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, 119991 Russia
2N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Moscow, 119991 Russia
3National University of Science and Technology “MISiS”, Moscow, 119049 Russia
4National Research Center "Kurchatov Institute", Moscow, 123182 Russia
5Federal Center for Dual-Use Technologies "Soyuz”, Dzerzhinsky, 140090 Russia
Keywords: частицы бора, получение бора, микроструктура, окисление бора, термический анализ, boron particles, boron production, microstructure, boron oxidation, thermal analysis
Abstract
This paper describes a study of boron powders and powder compounds, obtained by various methods, including metallothermal, electrolytic, and boron hydride cracking methods. The crystal state, particle size and microstructure, presence and composition of impurities, and chemical composition of the oxide layer of boron particles are profoundly investigated. The effects of the above-mentioned characteristics on the particle oxidation parameters during heating with a constant velocity are analyzed. The determining influence of chemical composition of the particle surface layer on the initial temperature of their intense oxidation is established. It is shown that the maximum increase in the weight and heat release value during oxidation of the boron powders is almost independent of microstructural features, crystal state, and chemical composition of and oxide layer thickness of the particles, and cannot serve as indicators of completeness of boron oxidation during heating.
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