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NASA NTRS · Abstract

Wetting Angle and Surface Tension of Germanium Melts on Different Substrate Materials

Published 2019-07-16 From Marshall Space Flight Center 5 authors
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This is the abstract and citation. Full text lives at NASA NTRS — we link out rather than host. All credit to the authors and Marshall Space Flight Center.

Abstract

Verbatim from NASA NTRS. Not paraphrased, not summarized.

The sessile drop technique has been used to measure the wetting angle and the surface tension of molten germanium (Ge) on various substrate materials. Sapphire, fused silica, glassy carbon, graphite, SiC, carbon-based aerogel, pyrolytic boron nitride (pBN), AlN, Si3N4, and CVD diamond were used as substrate materials. In addition, the effects of different cleaning procedures and surface treatments on the wetting behavior were investigated. The highest wetting angles with values around 170 deg. were found for pBN substrates under active vacuum or with a slight overpressure of 5N Argon or forming gas (2% Hydrogen in 5N Argon). The measurement of the surface tension and its temperature dependence for Ge under a forming gas atmosphere resulted in gamma(T) = 591 - 0.077 (T-T(sub m).

Authors

  • Kaiser, N. Freiburg Univ.
  • Croell, A. Technische Univ.
  • Szofran, F. R. NASA Marshall Space Flight Center
  • Benz, K. W. Freiburg Univ.
  • Rose, M. Franklin

Citation: Kaiser, N., Croell, A., Szofran, F. R. , et al. (2019). Wetting Angle and Surface Tension of Germanium Melts on Different Substrate Materials. Marshall Space Flight Center. NASA NTRS ID 20010020661. https://ntrs.nasa.gov/citations/20010020661 ↗