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Free Surface and Interface Thermodynamics of Liquid Nickel in Contact with Alumina

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Interface Science

Abstract

Sessile drop experiments of Ni and Ni(2at.%Al) were conducted under controlled working conditions, at 1500°C, P(O2) ≤ 10−9 Torr. It is shown that Al and oxygen atoms engaged in the capillary driven mass transport at the interface have a significant impact on the surface/interface thermodynamics. The surface energy of liquid Ni determined from experiments in which Ni comes into contact with Al2O3 is significantly lower than that of high purity Ni, due to the segregation of Al. The free energy of segregation of Al to the free surface of Ni (Δ G S) was found to range from −164 to −152 kJ/mol, indicating a relatively strong tendency for segregation of Al to the free surface of Ni(Al). It is proposed that an Al(O)-rich liquid layer forms adjacent to the Ni-Al2O3 interface, which improves interfacial adhesion. In the Ni(Al)-Al2O3 system, an increase in the Al content of the alloy leads to the improvement of both wetting and adhesion of the alloy on the ceramic, correlating with the improvement in the interface strength after solidification.

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Authors and Affiliations

  1. Department of Materials Engineering, Technion-Israel Institute of Technology, 32000, Haifa, Israel

    George Levi & Wayne D. Kaplan

  2. Materials Department, University of California at Santa Barbara, Santa Barbara, CA, 93106-5050, USA

    David R. Clarke

Authors
  1. George Levi
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  2. David R. Clarke
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  3. Wayne D. Kaplan
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Correspondence to Wayne D. Kaplan.

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Levi, G., Clarke, D.R. & Kaplan, W.D. Free Surface and Interface Thermodynamics of Liquid Nickel in Contact with Alumina. Interface Science 12, 73–83 (2004). https://doi.org/10.1023/B:INTS.0000012295.38485.90

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  • DOI: https://doi.org/10.1023/B:INTS.0000012295.38485.90

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