Abstract
The oxidation behavior of powder compacts of both amorphous and crystalline boron was studied in air at temperatures between 400 and 1300°C. Crystalline and amorphous boron during the initial stage of oxidation followed a parabolic rate law. Crystalline boron formed a protective coating of boron oxide between 600 and 1100°C, and after 24 hours in this temperature range 16–19% of the boron was oxidized to B2O3. Amorphous boron oxidized at a greater rate than crystalline boron between 600 and 1000°C, and after 24 hours 22–26% of the boron was oxidized to B2O3. Above 1000°C vaporization of B2O3 took place, in addition to the formation of a brown suboxide of boron. The composition of this suboxide has been determined as B7O. Boron nitride was also formed during the oxidation of amorphous boron between 1100 and 1300°C.
In addition to the oxidation of powder compacts of boron, a number of oxidation tests were performed with crystalline boron in the massive form. There is considerable scatter of the data for boron in the massive form which is attributed to microcracks in the boron.
The addition of silicon was found to increase substantially the oxidation resistance of boron.
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Rizzo, H.F. (1960). Oxidation of Boron at Temperatures between 400 and 1300°C in Air. In: Kohn, J.A., Nye, W.F., Gaulé, G.K. (eds) Boron Synthesis, Structure, and Properties. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-6572-1_21
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DOI: https://doi.org/10.1007/978-1-4899-6572-1_21
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