Abstract
Aluminium hydroxides have been precipitated from various aluminium salts and the differences in their thermal behaviour have been investigated. Pseudoboehmite derived from the nitrate, sulfate and chloride all form γ-Al2O3 at ∼ 400°C but the formation of α-A12O3 at 1200°C occurs more readily in the material derived from the sulfate. This contains a higher concentration of anionic impurities related to differences in the solubility of the original aluminium salts. The sulfate is retained in the gel to higher temperatures at which its eventual decomposition may lead to the formation of a reactive pore structure which facilitates the nucleation of α-A12O3.
Similar content being viewed by others
References
Braun S, Appel L, Zinner L and Schmal M 1999Br. Ceram. Trans. 98 87
Bennett I and Stevens R 1998Br. Ceram. Trans. 97 117
Dzisko V 1979Kinetika i kataliz 20 1526
Lee J and Yu S 1992J. Mater. Sci. 27 5203
Levin I and Brandon D 1998J. Am. Ceram. Soc. 81 1995
Messing G, Kumagai M, Shelleman and McArdle J 1986 inScience of ceramic chemical processing (eds) L Hench and D Ulrich (New York: John Wiley) p. 259
Okada K, Otsuka N and Somiya S 1991Ceram. Bull. 70 1633
Sathiyakumar M and Gnanam F 1999Br. Ceram. Trans. 98 87
Sunil Kumar C, Hareesh V, Damodaran A and Warrier K 1997J. Eur. Ceram. Soc. 17 1167
Tottenhorst R and Hofmann D 1980Clays Clay Miner. 28 373
Trawczynski J 1993Przemysl Chemiczny 72 279
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Temuujin, J., Jadambaa, T., Mackenzie, K.J.D. et al. Thermal formation of corundum from aluminium hydroxides prepared from various aluminium salts. Bull Mater Sci 23, 301–304 (2000). https://doi.org/10.1007/BF02720086
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02720086