DEVELOPMENT OF A MOLD EQUIPMENT
FOR ELECTROPHORETIC SHAPING OF CERAMIC PRODUCTS
E. I. Suzdal’tsev
and D. V. Kharitonov
Translated from Ogneupory i Tekhnicheskaya Keramika, No. 10, pp. 12 – 19, October, 2003.
A brief review of the previous studies aimed at the development of techniques for fabrication of large-sized,
thick-walled, complex-profiled ceramic components from aqueous slips of inorganic materials is given.
This work is concerned with the development of a mold
equipment for the electrophoretic shaping of large-sized,
thick-walled ceramic products of complex profile prepared
from aqueous lithium aluminosilicate glass-based slips.
We have gained some experience in this field [1 – 4].
Thus, in , methods for accelerated molding of ceramic
components from inorganic materials (quartz and lithium
aluminosilicate glasses) were discussed and potentialities of
the electrophoretic deposition method for production of ce-
ramics (in particular, from quartz glass slips) were demon-
strated. It was shown in [2, 3] that this method can be used
for preparing ceramics from lithium aluminosilicate glass.
A literature survey  has provided evidence for electropho-
resis as a promising route towards shaping ceramics from in
organic slips. Still, at present, no reliable electrophoretic
technique is available for preparation of large-sized
thick-walled engineering components with complex profile.
The present study is concerned with some aspects of this
It was shown in the aforementioned work  that glass
ceramic preforms of lithium aluminosilicate composition
prepared by electrophoretic deposition in some of their
physicomechanical properties did not differ much from, or
even were superior to, ceramic products obtained by the tra
ditional technologies. However, the electrophoretic deposi
tion method, for all its strengths, had serious limitations —
the attempts to shape a large-sized thick-walled complex-
profiled engineering component met with little success.
A conclusion was drawn from the literature survey in :
For an electrophoretic deposition technology to be effective,
two practical problems are to be solved — the proper selec
tion of a material for the electrodes of an electrophoretic setup
[5, 6], and the properly selected design of this setup [7, 8].
SELECTION OF MATERIAL AND DESIGN
OF SHAPING ELECTRODE (ANODE)
The principle of electrophoretic shaping of ceramic pro-
ducts is as follows. The particles that are suspended in a slip
start moving under the action of an electric field (generated
by applying voltage to the electrodes of a mold equipment)
towards the electrode that bears an opposite charge to be-
come deposited on it; thereby, a body for the preform is built
(see Fig. 1). Positive or negative charge can be applied to the
shaping electrode (depending on the surface charge of the
particle); usually, the shaping electrode serves as an anode
considering that the particles typically carry a negative
charge. The cathodic processes are of minor importance for
electrophoretic deposition, whereas the processes that occur
on the anode merit more attention.
Electric current passing through the aqueous slip causes
water electrolysis, which is manifested in the release of oxy
gen at the anode, and of hydrogen at the cathode. The re
Refractories and Industrial Ceramics Vol. 45, No. 1, 2004
1083-4877/04/4501-0058 © 2004 Plenum Publishing Corporation
Tekhnologiya Research and Production Enterprise, Obninsk,
Kaluga Region, Russia.
Fig. 1. Schematic diagram of the electrophoretic shaping of ceram
ics from an aqueous slip.