Mechanism and kinetics of electrophoretic deposition of Al{sub 2}O{sub 3}
Conference
·
OSTI ID:229996
- McMaster Univ., Hamilton, Ontario (Canada)
The four main electrophoretic deposition (EPD) mechanisms are discussed and their shortcomings pointed out. The Hamaker constant for Al{sub 2}O{sub 3} in ethanol suspension is determined by modelling the relationship between particle interaction energy and suspension stability. The Derjagun-Landau-Verwey-Overbeek (DLVO) interaction energy curve for Al{sub 2}O{sub 3} particles in ethanol suspension is calculated and the minimum deposition voltage determined. Three probe dc measurements were conducted to explain discrepancies between the calculated and experimentally-observed voltage. A mechanism proposed is based on the DLVO theory and particle-lyosphere destortion/thinning. Kinetic equations for EPD are developed for constant current and constant voltage deposition using mass balance conditions and verified by experimental data.
- OSTI ID:
- 229996
- Report Number(s):
- CONF-9505249--
- Country of Publication:
- United States
- Language:
- English
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