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Molten Al and (0001) α-Al2O3 Single Crystal: Interface Stability

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Abstract

The roughness on the “c”-plane (0001) sapphire single crystal reduces wetting of molten aluminum under Ar gas (99.999 pct) and PO2 10−15 Pa from 1073 K to 1473 K (800 °C to 1200 °C). The contact angle effect was partially understood by the roughness factor, R; however, the interfacial phenomenon involving this effect is yet a topic to study as it also depends, between other things, on the shape of droplet and the relationship to its substrate. The theory explains that the surface tension of liquid aluminum obtained by the sessile drop test can be determined just when a substrate is polished or free of any surface imperfection. However, roughness of sapphire (0001) surface promotes an apparent surface tension that exhibits different trends of wetting to that proposed in previous studies. This property adds to the interfacial wetting phenomena obtained from the Al-Al2O3 couple system and provides answers for contact angle trends toward a much more stable interface, which when coupled with thermodynamic conditions may help in the manufacturing, deterioration, and reliability of the system.

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Acknowledgments

The author (J.A-S) would like to mention special thanks to Dr. Richard C. Bradt, and Dr. Doru Stefanescu from the University of Alabama for their mentorship and guidance throughout this study.

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  1. Joaquin Aguilar-santillan (R&D Director)

    Present address: Materials and Tools, LLC, 4118 East Washington Ct, Gilbert, AZ, 85234, USA

Authors and Affiliations

  1. Metallurgical and Materials Engineering Department, University of Alabama, PO Box 870202, Tuscaloosa, AL, 35407-0202, USA

    Joaquin Aguilar-santillan (R&D Director)

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  1. Joaquin Aguilar-santillan
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Correspondence to Joaquin Aguilar-santillan.

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Manuscript submitted August 25, 2015.

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Aguilar-santillan, J. Molten Al and (0001) α-Al2O3 Single Crystal: Interface Stability. Metall Mater Trans A 47, 4941–4950 (2016). https://doi.org/10.1007/s11661-016-3680-7

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  • DOI: https://doi.org/10.1007/s11661-016-3680-7

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