The present invention provides methods for producing hollow ceramic
membranes by electrophoretic deposition. The hollow ceramic membranes may
have a small cross-sectional area of about 1.0.times.10.sup.-5 mm.sup.2
to about 25 mm.sup.2. The cross-sectional configuration of the hollow
ceramic membranes may be any geometry such as circular, square,
rectangular, triangular or polygonal. The hollow ceramic membranes
produced by the methods of the present invention may have multiple layers
but always the innermost layer, or the first deposited layer is porous
and made by electrophoretic deposition. Subsequent layers may be porous
or non porous and deposited before or after sintering the first layer. If
it is deposited after sintering, it may require additional sintering
steps. Additional layers may be deposited by further electrophoretic
deposition, sol-gel coating, dip coating, vacuum casting, brushing,
spraying or other known techniques.