Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 29, Issue 15, Pages 3167-3175Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2009.05.032
Keywords
Suspensions; Sintering; Hardness; ZrO2; Packing
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Yttria-stabilized-zirconia (YSZ) particles with various size distributions have been electrophoretically deposited (EPD) on Fecralloy substrate to investigate the particle size effect on EPD coatings. The deposition rates, as-deposited particle packing densities, green densities and sintered (for 2 h at 1250 degrees C in air) coating hardnesses are dependent on particle size. The particle packing arrangement in EPD coatings can be affected by further electric field densification (EFD) of the as-deposited coating in which the wet EPD coating is immersed in pure solvent (acetylacetone) with the application of a constant electric field. The effect of EFD was found to be most effective on small particles (<0.5 mu m) when they are co-deposited with large particles (>1 mu m). The improvements are reflected in increased mechanical hardness of sintered coatings. (C) 2009 Elsevier Ltd. All rights reserved.
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