Abstract
Alumina micro- and nanopowders with the particle size from 200 μm to 40 nm synthesized by the sol-gel method are studied. The particle size dependence of γ-Al2O3→α-Al2O3 phase transformation is studied by differential thermal analysis, X-ray diffraction method, and transmission electron microscopy. X-ray diffraction data show that for alumina nanoparticles γ-Al2O3→θ-Al2O3 phase transformation occurs at 900°C, and for micro-particles it occurs in the temperature range 1150–1200°C. The alumina ceramics produced of alumina nanoparticles is shown to have higher flexural strength under three-point bending than the ceramics produced of micro-particles. The obtained results demonstrate that alumina particle size reduction stabilizes the formation of α-Al2O3 at lower temperatures, due to which the grain growth rate decreases and the flexural strength of monolithic oxide ceramics increases.
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Original Russian Text © E.G. Zemtsova, A.V. Monin, V.M. Smirnov, B.N. Semenov, N.F. Morozov, 2014, published in Fizicheskaya Mezomekhanika, 2014, Vol. 17, No. 6, pp. 53–58.
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Zemtsova, E.G., Monin, A.V., Smirnov, V.M. et al. Formation and mechanical properties of alumina ceramics based on Al2O3 micro- and nanoparticles. Phys Mesomech 18, 134–138 (2015). https://doi.org/10.1134/S1029959915020058
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DOI: https://doi.org/10.1134/S1029959915020058