Wettability of carbon surfaces by pure molten alkali chlorides and their penetration into a porous graphite substrate

P. Baumli, G. Kaptay

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

The wettability of graphite and glassy carbon surfaces by pure molten alkali chlorides (NaCl, KCl, RbCl, CsCl) was measured by the sessile drop method. The contact angle was found to decrease with increase of the cation radius of the chloride. Using our measured and available literature data, a new, semi-empirical model is established to estimate the adhesion energy between the 20 alkali halide molten salts and graphite (or glassy carbon). The adhesion energy is found to increase with square of the radius of the cation, and the inverse of the radius of the anion of the salt. The minimum possible value for the surface energy of graphite (and glassy carbon) was found as 150 ± 30 mJ/m2. The critical contact angle of spontaneous penetration (infiltration) of the molten chlorides into a porous graphite substrate was found experimentally below 90°, in the interval between 31° and 58°. This is explained by the inner structure of the porous graphite.

Original languageEnglish
Pages (from-to)192-196
Number of pages5
JournalMaterials Science and Engineering A
Volume495
Issue number1-2
DOIs
Publication statusPublished - Nov 15 2008

Fingerprint

Graphite
Alkalies
wettability
Wetting
Molten materials
Chlorides
alkalies
Carbon
penetration
graphite
chlorides
glassy carbon
Glassy carbon
carbon
Substrates
Contact angle
radii
Cations
adhesion
Adhesion

Keywords

  • Adhesion energy
  • Alkali halide
  • Contact angle
  • Glassy carbon
  • Graphite
  • Infiltration
  • Penetration
  • Wettability

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Wettability of carbon surfaces by pure molten alkali chlorides and their penetration into a porous graphite substrate. / Baumli, P.; Kaptay, G.

In: Materials Science and Engineering A, Vol. 495, No. 1-2, 15.11.2008, p. 192-196.

Research output: Contribution to journalArticle

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