High-temperature oxidation of boron nitride |
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| Affiliation: | 1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha 410073, China;2. Northwest Institute of Nuclear Technology, Xi’an, 710024, China;1. Dept. of Chemistry, University of Connecticut, Storrs, CT, 06269, USA;2. NASA Glenn Research Center, Cleveland, OH, 44135, USA;3. Institute of Material Science, University of Connecticut, Storrs, CT, 06269, USA;1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha, 410073, China;2. Northwest Institute of Nuclear Technology, Xi''an, 710024, China |
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| Abstract: | The oxidation resistance of boron nitride samples obtained by various methods and having different crystalline structures has been studied by thermogravimetric, differential thermal and IR spectral analyses. The real structure of a material being oxidized is of the greatest importance for the steady-state process of high-temperature oxidation. During the boron nitride oxidation, secondary processes are observed, associated with the rearrangement of the wurtzite-like BN lattice into a thermodynamically more stable hexagonal lattice of the graphite-like boron nitride. Nitrogen dioxide formation in the gas phase has been shown. Physico-chemical properties of the scale (B2O3 vaporization) impose limitations on the use of boron nitride-based materials in oxidizing media at temperatures higher than 1300°C. |
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