Ceramics-Silikáty 51, (1) 15 - 23 (2007) |
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HYDROXYAPATITE COATINGS DEPOSITED FROM ALCOHOL SUSPENSIONS BY ELECTROPHORETIC DEPOSITION ON TITANIUM SUBSTRATE
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Plešingerová Beatrice 1, Súčik Gabriel 1, Maryška Martin 2,
Horkavcová Diana 1
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1 Department of Ceramics, Faculty of Metallurgy, Technical University of Košice, Letná 9/A, 040 02 Košice, Slovakia
2 Department of Glass and Ceramics, Institute of Chemical Technology Prague, Technická 5, 166 28 Prague, Czech Republic
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Keywords: Powders of hydroxyapatite, Ceramic particles, Electrophoretic deposition, Ti- cathode
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Non-calcined and calcined, synthetic powders of HAp were deposited by electrophoretic (EPD) process from alcohol medium
(methanol, ethanol, propanol and butanol) on the Ti-plate cathode within one or several cycles. The quality and the rate of
the coating deposition were evaluated with respect to applied direct voltage (5, 10 and 20 V) and the concentration of suspension.
The optimal conditions bring the medium of methanol and a direct voltage of 10 V. The coating thickness attained
within several seconds tens of micrometers. The deposition time 150-180 s brings the layer thickness 150-200 µm. The growth
rate of coating is affected mostly by the current density and duration of process, i.e. by charge density. The suspension concentration,
conductivity of suspension and applied voltage are the main determining factors of the current density. |
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