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Wettability of Aluminum on Alumina

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Abstract

The wettability of molten aluminum on solid alumina substrate has been investigated by the sessile drop technique in a 10−8 bar vacuum or under argon atmosphere in the temperature range from 1273 K to 1673 K (1000 °C to 1400 °C). It is shown that the reduction of oxide skin on molten aluminum is slow under normal pressures even with ultralow oxygen potential, but it is enhanced in high vacuum. To describe the wetting behavior of the Al-Al2O3 system at lower temperatures, a semiempirical calculation was employed. The calculated contact angle at 973 K (700 °C) is approximately 97 deg, which indicates that aluminum does not wet alumina at aluminum casting temperatures. Thus, a priming height is required for aluminum to infiltrate a filter. Wetting in the Al-Al2O3 system increases with temperature.

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Notes

  1. ALLTECH is the trademark of Alltech Associated, Inc., 2051 Waukegan Road, Deerfield, IL 60015-1899.

  2. RAPIDOX 2100 is a zirconia oxygen gas analyzer from Cambridge Sensotec Limited, 31 Elizabeth Court, St Ives, CAMBS PE27 5BQ, United Kingdom.

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Acknowledgment

This research was carried out as part of the Norwegian Research Council (NRC) funded BIP Project (No. 179947/I40) Remelting and Inclusion Refining of Aluminum (RIRA). It includes the following partners: Hydro Aluminum AS, SAPA Heat Transfer AB, Alcoa Norway ANS, NTNU, and Sintef. Funding by the industrial partners and NRC is acknowledged gratefully. Thanks are also given to Tone Anzjøn for assisting in the sessile drop tests.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Norwegian University of Science and Technology, N-7491, Trondheim, Norway

    Sarina Bao, Merete Tangstad (Professor) & Thorvald Abel Engh (Emeritus Professor)

  2. Department of Metallurgy, SINTEF Materials and Chemistry, N-7465, Trondheim, Norway

    Kai Tang (Researcher) & Anne Kvithyld (Researcher)

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  1. Sarina Bao
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  2. Kai Tang
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  3. Anne Kvithyld
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  4. Merete Tangstad
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  5. Thorvald Abel Engh
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Correspondence to Merete Tangstad.

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Manuscript submitted January 3, 2011.

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Bao, S., Tang, K., Kvithyld, A. et al. Wettability of Aluminum on Alumina. Metall Mater Trans B 42, 1358–1366 (2011). https://doi.org/10.1007/s11663-011-9544-z

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  • DOI: https://doi.org/10.1007/s11663-011-9544-z

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