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A Thermo-Chemical Surface Treatment of AlN Powder for the Aqueous Processing of AlN Ceramics

Published online by Cambridge University Press:  03 March 2011

S.M. Olhero ,
S. Novak ,
M. Oliveira ,
K. Krnel ,
T. Kosmac  and
J.M.F. Ferreira
S.M. Olhero
Affiliation:
Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
S. Novak
Affiliation:
Engineering Ceramics Department, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia
M. Oliveira
Affiliation:
Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
K. Krnel
Affiliation:
Engineering Ceramics Department, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia
T. Kosmac
Affiliation:
Engineering Ceramics Department, Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia
J.M.F. Ferreira
Affiliation:
Department of Ceramics and Glass Engineering, CICECO, University of Aveiro, 3810-193 Aveiro, Portugal
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Abstract

Dense aluminum nitride ceramics were prepared by sintering green bodies at 1750 °C for 2 h. These green bodies were prepared by aqueous slip-casting from a powder that was surface-treated to prevent hydrolysis. The surface treatment of the aluminum nitride (AlN) powder consisted of dispersing the powder in warm-water solutions of aluminum dihydrogenphosphate Al(H2PO4)3. Different treatment temperatures in the range 30–80 °C were tested. For all the tested temperatures, the surface-treated AlN powder was found to be water-resistant, even after drying and/or redispersion. Various commercial dispersants were tested for their effectiveness, and the amount of dispersant was optimized in terms of a high solids loading of the suspension and an acceptable viscosity for slip casting. Based on these studies, a stable aqueous suspension of AlN powder, treated at 60 °C, with a total solids loading of 50 vol%, was prepared using CaF2 as a sintering additive. The well-dispersed powder made it possible to prepare green samples with close particle packing and relatively high sintered densities; that is, more than 96% of the theoretical density.

Keywords

Aluminium nitrideHydrolysisSurface-treatment
Type
Articles
Information
Journal of Materials Research , Volume 19 , Issue 3 , March 2004 , pp. 746 - 751
Copyright
Copyright © Materials Research Society 2004

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References

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