Abstract
The wetting of nickel, platinum and palladium boride eutectics (Ni55B45, Ni62B38, Pd72B28, and Pt72B28) to polycrystalline graphite has been studied by sessile drop and surface analytical techniques. The wettability is critically influenced by surface segregation of low-level bulk impurities in the alloys. At the melting temperature, the impurities segregate to the surface of the liquid alloy and inhibit wetting. A poorly-wetted droplet with a large contact angle results. Good wetting results by introducing materials into the contact system which possess high chemical reactivity to the major segregant species, either as a surface coating or by incorporation into the alloy during manufacture. The materials act to suppress segregation by tying up the alloy impurities through compound formation. The results indicate that the use of surface sensitive techniques in the study of wetting is essential.
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Bozack, M.J., Swanson, L.W. & Bell, A.E. Wettability of transition metal boride eutectic alloys to graphite. J Mater Sci 22, 2421–2430 (1987). https://doi.org/10.1007/BF01082126
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DOI: https://doi.org/10.1007/BF01082126