X-ray-phase and thermal analysis methods, and also IR-spectrometry are used to study reaction mechanisms for sodium polyaluminate (SPA) nanopowder and high-temperature ceramic based on sodium β″-alumina with water vapor and air carbon dioxide. It is shown that with exposure of SPA in a moist air atmosphere as a result of forming the hydroxonium form of β″alumina (H3O-β″-alumina) and hydroxyl OH– groups, there is breakdown of the sodium-beta-alumina structure. Features of SPA phase transformations with prolonged storage in air at room temperature and heating products of decomposition up to 1200°C are studied. Processes of beta-alumina structure breakdown are reversible in nature, but in ceramic lead to irreversible changes of surface layer composition.
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Translated from Novye Ogneupory, No. 5, pp. 31 – 41, May, 2012.
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G. B. Tel’nova; L. I. Shvorneva; S. V. Kutsev. Study of sodium polyaluminate reaction mechanisms with an air atmosphere. Refract Ind Ceram 53, 162–171 (2012). https://doi.org/10.1007/s11148-012-9486-2
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DOI: https://doi.org/10.1007/s11148-012-9486-2