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Reactions at the Interface Between Al2O3–SiO2 Ceramics with Additives of Alkaline-earth Oxides and Liquid Al–Si Alloy

Published online by Cambridge University Press:  31 January 2011

M. Oliveira ,
S. Agathopoulos  and
J. M. F. Ferreira
M. Oliveira
Affiliation:
Department of Ceramics and Glass Engineering, University of Aveiro, Portugal
S. Agathopoulos
Affiliation:
Department of Ceramics and Glass Engineering, University of Aveiro, Portugal
J. M. F. Ferreira
Affiliation:
Department of Ceramics and Glass Engineering, University of Aveiro, Portugal
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Abstract

The interfacial reactions between aluminosilicate ceramics doped with MgO, CaO, or BaO and Al–7 wt% Si alloy were investigated at 1023, 1173, and 1323 K under vacuum for 4 h. Alkaline-earth oxide additives defined phase formation and microstructure of the sintered ceramics and subsequently controlled the ceramic/metal interfacial reactions, which were always intensive. In general, reaction zones consisted of Al2O3, infiltrated with Al. In the case of CaO- and BaO-doped ceramics, precipitates formed into the metal phase and concentrated the reduced Ca and Ba, respectively. A reaction mechanism is proposed, which anticipates an active role of SiO2.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 3 , March 2002 , pp. 641 - 647
Copyright
Copyright © Materials Research Society 2002

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