Influence of Alumina Nanoparticles on Transformation of Mechanically Activated Gibbsite into alpha-Al2O3
G. R. KARAGEDOV
Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
E-mail: garik@solid.nsc.ru
Keywords: aluminium hydroxide, alpha-alumina, nanopowder, synthesis, sintering
Pages: 501-506
Abstract
Mechanical activation of gibbsite containing 0.5–5 vol. % of alumina nanoparticles was carried out in a planetary mill. It was demonstrated that upon 10g acceleration and above, subsequent calcination at 800 °C resulted in the complete transformation of aluminium hydroxide into a stable modification of alumina with particle size below 100 nm. Thermal treatment of activated aluminium hydroxide in wet media inhibits aggregate formation. Furthermore, powder-compacted samples are sintered till densities higher than 98 % of theoretically possible at 1350 °С.
DOI: 10.15372/CSD20180508
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