Abstract
Sessile drop experiments have been performed in a temperature range between 1090 and 1300° C, aiming to study the wetting of niobium by liquid copper and the influence of different atmospheres (argon, hydrogen, vacuum), crystallographic orientation, roughness, and oxygen doping of niobium on the wetting angle. At the peritectic temperature in the Cu-Nb system (1090° C) the contact angle is high,θ=67°, denoting poor wetting. With increasing temperature,θ decreases steadily for all samples. The wetting is at its lowest for the oxygen-doped samples and at its best for samples annealed under a hydrogen atmosphere. A new mechanism is suggested and discussed for oxygen degassing of niobium through liquid copper.
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De Lima, O.F., Krehl, M. & Schulze, K. Wetting characteristics of copper on niobium. J Mater Sci 20, 2464–2470 (1985). https://doi.org/10.1007/BF00556075
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DOI: https://doi.org/10.1007/BF00556075