Wetting of lithium on nanostructured surfaces for first wall components

M. Szott, P. Fiflis, K. Kalathiparambil, I. Shchelkanov, D. N. Ruzic, B. Jurczyk, R. Stubbers, C. Joel Foster

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Liquid metals are garnering increased attention as an alternative divertor solution to tungsten divertors. While tungsten suffers from a myriad of potentially critical issues, such as bulk erosion, melting under significant transient heat loads, and nanostructuring colloquially referred to as fuzz, liquid metals avoid many of these entirely. In order to implement liquid metal concepts, the interactions between the liquid metal and the substrate it is deposited upon must be characterized. One such critical interaction is the wetting of a liquid metal on the surface of the PFC structure. The wetting ability of a substance determines many significant properties, including the thickness of the liquid film and the propensity of a flowing liquid to break into rivulets. A previous study conducted at the University of Illinois [1] characterized wetting as a measurement of the contact angle of lithium when deposited as liquid droplets onto a surface. The dependence of the contact angle on temperature was measured, finding a transition between non-wetting and wetting at a critical temperature. For example, at 215 °C, stainless steel registers a contact angle of 137°, whereas above its wetting temperature of 315 °C, the contact angle is less than 80°. The impact of nanostructuring of the surface is detailed herein. A novel method of rapid laser nanostructuring was developed to create the samples. To further the knowledge of liquid metal PFC surface interactions, results of experiments on the relationships between material and temperature and the contact angle of lithium are presented for a variety of nanostructured surfaces.

Original languageEnglish (US)
Title of host publication2015 IEEE 26th Symposium on Fusion Engineering, SOFE 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479982646
DOIs
StatePublished - May 31 2016
Event26th IEEE Symposium on Fusion Engineering, SOFE 2015 - Austin, United States
Duration: May 31 2015Jun 4 2015

Publication series

NameProceedings - Symposium on Fusion Engineering
Volume2016-May

Other

Other26th IEEE Symposium on Fusion Engineering, SOFE 2015
CountryUnited States
CityAustin
Period5/31/156/4/15

Keywords

  • Lithium
  • Plasma facing components
  • Wetting
  • contact angle

ASJC Scopus subject areas

  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering

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