Syntheses and Evaluation of Porous ZrO₂ Ceramics by Electrophoretic Deposition Method

Abstract

In this study, porous ZrO 2 ceramics were successfully prepared by an electrophoretic depositions EPD method with gas generation in the aqueous ZrO 2 slurry. Especially, this aqueous EPD process in combination with a sintering step formed porous ZrO 2 with a number of unidirectionally aligned continuous pores. Also, adding starch into ZrO 2 slurry resulted in the increase of porosity of ZrO 2 ceramics. Thus, applying the aqueous EPD process has a great advantage in environmental issues and cost reduction for fabricating porous ceramics.

ZrO2 ceramics with aligned pore structure by EPD and their characterisation by X-ray computed tomography

“…11,12 In a similar manner as described by Kerkar,10 graphite rods were used as deposition electrodes. The pore structure was influenced by the pH value and the current.…”

“…Starch was added to increase the porosity of the ceramics. 12 The porous bodies were characterised by optical and SEM micrographs.…”

Porous ceramics mimicking nature—preparation and properties of microstructures with unidirectionally oriented pores

“…Porous ceramics prepared using bubbles as the pore formers were introduced in section 2.3.2 [60][61][62][63]. Nakahira et al prepared unidirectional porous Al 2 O 3 [73] and ZrO 2 [74] ceramics using an aqueous EPD process in which Al 2 O 3 particles suspended in water at pH 2.5-4 were deposited on a carbon cathode by applying a dc voltage of 5-500 V [73]. Electrolysis of the water produces H 2 bubbles at the cathode which form unidirectional pores perpendicular to the deposit.…”

Ceramics with Regularly Arranged Tubular Pores by Electrophoretic Deposition at Gauze Electrodes

“…Only very few publications by other authors about this method are known. [4][5][6] These authors used graphite electrodes (rods or crucibles) which were removed by firing in air after the deposition.…”

“…On the other side, EPD with simultaneous gas evolution can be used as simple and promising method for fabricating porous materials. Only very few publications by other authors about this method are known 4–6. These authors used graphite electrodes (rods or crucibles) which were removed by firing in air after the deposition.…”