Abstract :
The electrophoretic depositional (EPD)
behavior of yttria-stabilized zirconia (YSZ) powder
with 8 mol% Y2O3, which is a common material for
oxygen sensors as a solid electrolyte, was investigated
on stainless steel and carbon based substrates. Ethanol
+ HNO3 based suspensions were used for the EPD
experiments, and three different YSZ powders, one
commercially available powder and two own-made
coprecipitated powders, were deposited. The latter
powders were calcined at 900 and 1200 C, respectively.
The concentration of the suspension was
3 g/300 cm3 and a small amount of HNO3 solution
was added as a dispersant. A DC electric field of 100–
200 V/15 mm was applied between parallel electrodes.
On stainless steel electrodes it was found that the ownmade
coprecipitated powder calcined at 1200 C,
showing the best deposition properties, whereas the
commercial YSZ powder showed the best depositional
properties on carbon electrodes. These characteristic
depositional behaviors are discussed with regard to the
adhesive force between the particles and the different
electrodes, and some powder properties, e.g., particle
size distribution and packing behavior.
A thick, continuous, free-standing YSZ film with a
thickness of around 10 lm was successfully obtained
after firing the deposit on the carbon electrode in
flowing air.
