Title: α-alumina production from commercial alums

Authors: S. Maschio, O. Sbaizero, S. Meriani

Addresses: Instituto di Chimica Applicata e Industriale, University of Trieste, via A. Valerio, 234127 Trieste, Italy. ' Instituto di Chimica Applicata e Industriale, University of Trieste, via A. Valerio, 234127 Trieste, Italy. ' Instituto di Chimica Applicata e Industriale, University of Trieste, via A. Valerio, 234127 Trieste, Italy

Abstract: Sinter-reactive powders of α-alumina have been prepared effectively by the decomposition of aluminium basic carbonates. In this work we have studied the urea CO(NH₂)₂ homogeneous hydrolysis method, applied to alum solutions, KAl(SO₄)₂ • 12H₂0, using various urea and alum ratios, to precipitate aluminium basic carbonates. The thermal decomposition of the aluminium precipitates, produces fine alumina powders that are suitable for ceramic purposes.

Keywords: ceramics; alumina powders; aluminium basic carbonates; sintering; thermal decomposition; aluminium precipitates.

DOI: 10.1504/IJMPT.1990.036613

International Journal of Materials and Product Technology, 1990 Vol.5 No.2, pp.121 - 128

Published online: 05 Nov 2010 *

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