Skip to main content Accessibility help
×
Home

Hydrolysis of aluminium metal, synthesis of nano alumina and sol-gel processing of monoliths

  • M. Thiruchitrambalam (a1) and V.R. Palkar (a2)

Abstract

High purity alumina is usually prepared using various intermediate aluminium compounds such as aluminium nitrate, aluminium alkoxides etc., as precursors. In fact the above mentioned intermediate aluminium compounds themselves are produced from aluminium metal. The present investigation is concerned with examining the feasibility of using aluminium hydroxides prepared by hydrolyzing aluminium metal, for sol gel processing. The study assumes added significance in view of the claims of Alcoa that it is possible to produce high purity aluminium metal in large quantities economically.

During the present investigation sols were prepared by using various hydroxides, ie., bayerite, gibbsite and boehmite. Sol gel transition was observed only in the case of boehmite sol and this was gelated by either forced gelation method to prepare powder or controlled gelation method to prepare monoliths.

Transparent Xerogels (boehmite) could be prepared by controlled gelation method but the presence of a thin layer of bayerite often resulted in translucency. Crack free monoliths could be prepared by heating the xerogels at a low heating rate(< 1 °C/min). It was found that sol gel processed boehmite transformed to alpha alumina at a relatively lower temperature (∼ 1080 °C ) than the as prepared boehmite which transformed at about 1200 °C.

Copyright

Corresponding author

# thiruchi_m@yahoo.com (M. Thiruchitrambalam) at present he works with the Department of Mechanical Engineering, Mahalingam College of Engineering, Pollachi, Tamil Nadu, India

References

Hide All
1. Yoldas, B.E., Am. Ceram. Soc. Bull., 54, 289 (1975).
2. Ramanathan, S., Bhat, R., Upadhyaya, D.D. and Roy, S.K. Bull. Mater. Sci., 17, 95 (1994).
3. Varma, H.K., Mani, T.V., Damodran, A.D. and Warrier, K.G.K., J. Am. Ceram. Soc., 77, 1597 (1994).
4. Kilbride, I.P. and Barker, A.J., Brit. Ceram. Trans., 93, 187 (1994).
5. Thiruchitrambalam, M., Palkar, V. R. and Gopinathan, V., Materials Letters, 58, 3063 (2004).
6. Martin, E.S. and Weaver, M.L., Am. Ceram. Soc. Bull, 72, 71 (1993).
7. Kirk-Othmer, Encyclopaedia of Chemical Technology, edited by. Kirk-Othmer, , 2, (Wiley, New York, 1992), p 289.
8. Brauer, Georg, Hand book of preparative Inorganic Chemistry, Vol. 1, (Academic Press New York, 1963), p 821
9. Bennet, J.E. and Pinnel, M.R., Journal of Materials Science, 8, 1189 (1973).
10. Lu, J., Gao, L., Guo, J, and Niihara, K., Materials Research Bulletin, 35, 2387 (November 2000).
11. Ananthakumar, S., Menon, A.R.R., Prabhakaran, K., Warrier, K.G.K., Ceramics International, 27, 231 (2001).
12. Yang, Z., Lin, Y.S., Industrial and Engineering Chemistry Research, 35, 4944 (12th December 2000)
13. Lu, J., Gao, L., Sun, J., Gui, L., Guo, J., Journal of Materials Science Letters, 20, 1 (2001).
14. Djuricic, B., Pickering, S., McGarry, D., Tambuyser, P. and Thomas, P., Journal of Materials Science, 34, 1911 (15th April 1999).
15. Pan, X. L., Sheng, S.S., Xiong, G.X., Fang, K.M., Tudyka, S., Stron, N., Brunner, H., Colloids and Surfaces A, 179, 163 (3 rd March 2001).
16. Yoldas, B.E., Am. Ceram. Soc. Bull., 54, 286 (1975).
17. Horn, D.S. and Messing, G.L., J. Am. Ceram. Soc., 72, 1719 (1989).

Keywords

Hydrolysis of aluminium metal, synthesis of nano alumina and sol-gel processing of monoliths

  • M. Thiruchitrambalam (a1) and V.R. Palkar (a2)

Metrics

Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed