Determination of surface mass transport parameters from morphological changes of beaded metallic thin films on alumina

D. L. Beke, I. Beszeda, G. Erdélyi

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Experiments on the time dependence of the effective thickness and shift of the boundary of beaded metallic thin films (Ag, Cu, and Ni) on alumina surface are reviewed. In all cases the evaporation was responsible for the leakage of the material from the film and the effect of bulk diffusion and bulk reaction could be neglected. It is illustrated that for oxidation of metallic particles or for reactive or non reactive bonds between the film and the surface, the mass transfer can be controlled by different mechanisms. For Ni and Cu (reactive bond) the process is controlled by surface reaction at the perimeter of the beads and the surface diffusion coefficients, Ds', and the surface reaction rate coefficients, βs', are determined as the function of temperature. In the case of Ag (non-reactive bond) the process is controlled by the surface diffusion and the temperature dependence of Ds' has been determined. The surface diffusion was not sensitive to the change of substrate from sapphire to amorphous alumina scale.

Original languageEnglish
Pages (from-to)1167-1176
Number of pages10
JournalDefect and Diffusion Forum
Volume143-147
DOIs
Publication statusPublished - 1997

Fingerprint

Metallic films
Surface diffusion
Aluminum Oxide
surface diffusion
Alumina
Mass transfer
aluminum oxides
Surface reactions
Thin films
surface reactions
thin films
Sapphire
beads
Reaction rates
mass transfer
time dependence
Evaporation
sapphire
reaction kinetics
leakage

Keywords

  • Ag surface layers
  • Alumina
  • Beaded films
  • Cu surface layers
  • Ni surface layers
  • Surface diffusion

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Radiation

Cite this

Determination of surface mass transport parameters from morphological changes of beaded metallic thin films on alumina. / Beke, D. L.; Beszeda, I.; Erdélyi, G.

In: Defect and Diffusion Forum, Vol. 143-147, 1997, p. 1167-1176.

Research output: Contribution to journalArticle

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