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Wetting and adhesion of Ni-Al alloys on α-Al2O3 single crystals

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Abstract

The effect of Al additions on the wetting and adhesion of Ni on an α-Al2O3 single crystal was studied. Contact angles were measured by the sessile drop technique under vacuum or in He atmosphere. The morphological and chemical features of metal-vapour and metal-oxide interfaces were determined by scanning electron microscope (SEM), microprobe analysis and profilometry. The work of adhesion of Ni-Al alloys on Al2O3 substrates was significantly higher than for pure Ni and Al components. This result was explained by co-operative adsorption of aluminium and oxygen atoms at the Ni-Al2O3 interface. The influence of oxidation of the alloy on wetting and bonding is also discussed.

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Authors and Affiliations

  1. LTPCM, INP Grenoble, BP 75, D.U., 38402, Saint Martin d'Hères Cedex, France

    V. Merlin & N. Eustathopoulos

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  1. V. Merlin
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  2. N. Eustathopoulos
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Merlin, V., Eustathopoulos, N. Wetting and adhesion of Ni-Al alloys on α-Al2O3 single crystals. JOURNAL OF MATERIALS SCIENCE 30, 3619–3624 (1995). https://doi.org/10.1007/BF00351875

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  • DOI: https://doi.org/10.1007/BF00351875

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