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 language | English |
|---|---|
| Pages (from-to) | 1167-1176 |
| Number of pages | 10 |
| Journal | Defect and Diffusion Forum |
| Volume | 143-147 |
| DOIs | |
| Publication status | Published - 1997 |
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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 journal › Article
}
TY - JOUR
T1 - Determination of surface mass transport parameters from morphological changes of beaded metallic thin films on alumina
AU - Beke, D. L.
AU - Beszeda, I.
AU - Erdélyi, G.
PY - 1997
Y1 - 1997
N2 - 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.
AB - 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.
KW - Ag surface layers
KW - Alumina
KW - Beaded films
KW - Cu surface layers
KW - Ni surface layers
KW - Surface diffusion
UR - http://www.scopus.com/inward/record.url?scp=22144487822&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=22144487822&partnerID=8YFLogxK
U2 - 10.4028/www.scientific.net/DDF.143-147.1167
DO - 10.4028/www.scientific.net/DDF.143-147.1167
M3 - Article
AN - SCOPUS:22144487822
VL - 143-147
SP - 1167
EP - 1176
JO - Defect and Diffusion Forum
JF - Defect and Diffusion Forum
SN - 1012-0386
ER -