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.
Refractories and Industrial Ceramics – Springer Journals
Published: Nov 13, 2012
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