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Reactive wetting of alumina by Ti-rich Ni–Ti–Zr alloys

Active brazing is a commonly used method for joining ceramic materials. In the present study, the wetting behavior of four Ti-rich ternary Ni–Ti–Zr alloys was investigated through sessile drop experiments on alumina disks of 96 and 99.9 % purity. The microstructure at the metal/alumina interface was...

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Bibliographic Details
Published in:Journal of materials science 2016-04, Vol.51 (8), p.3693-3700
Main Authors: Siegmund, Peter, Guhl, Conrad, Schmidt, Elke, Roßberg, Andreas, Rettenmayr, Markus
Format: Article
Language:English
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Summary:Active brazing is a commonly used method for joining ceramic materials. In the present study, the wetting behavior of four Ti-rich ternary Ni–Ti–Zr alloys was investigated through sessile drop experiments on alumina disks of 96 and 99.9 % purity. The microstructure at the metal/alumina interface was analyzed using scanning electron microscopy and energy-dispersive X-ray spectroscopy. Three of the analyzed alloys exhibited reactive wetting with final contact angles between 40° and 70°. The reaction phases at the metal/alumina interface had a thickness of about 1 µm and were of a similar composition for all alloys. Dilatometer measurements showed thermal expansion coefficients between 13.2 and 15.8 × 10 −6  °C −1 . The lowest wetting angle of 40° was achieved with the alloy 61Ti–20Zr–19Ni at temperatures above 980 °C.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-015-9684-7