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Wetting and adhesion of Ni-Al alloys on α-Al2O3single crystals

✍ Scribed by V. Merlin; N. Eustathopoulos

Publisher
Springer
Year
1995
Tongue
English
Weight
1002 KB
Volume
30
Category
Article
ISSN
0022-2461

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✦ Synopsis

The effect of AI additions on the wetting and adhesion of Ni on an ~-AI20a 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-AI alloys on AI203 substrates was significantly higher than for pure Ni and AI components. This result was explained by co-operative adsorption of aluminium and oxygen atoms at the Ni-AI203 interface. The influence of oxidation of the alloy on wetting and bonding is also discussed.

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