Abstract
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.
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Siegmund, P., Guhl, C., Schmidt, E. et al. Reactive wetting of alumina by Ti-rich Ni–Ti–Zr alloys. J Mater Sci 51, 3693–3700 (2016). https://doi.org/10.1007/s10853-015-9684-7
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DOI: https://doi.org/10.1007/s10853-015-9684-7