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

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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.

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Authors and Affiliations

  1. Department of Ceramics and Glass Engineering, University of Aveiro, Portugal

    M. Oliveira, S. Agathopoulos & J. M. F. Ferreira

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  1. M. Oliveira
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  2. S. Agathopoulos
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  3. J. M. F. Ferreira
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Oliveira, M., Agathopoulos, S. & Ferreira, J.M.F. Reactions at the Interface Between Al2O3–SiO2 Ceramics with Additives of Alkaline-earth Oxides and Liquid Al–Si Alloy. Journal of Materials Research 17, 641–647 (2002). https://doi.org/10.1557/JMR.2002.0091

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