U.S. Philips Corporation

Gerd Romanowski

Walter Mayr

Joachim F Opitz

Josef Lauter

Hans-Jurgen Lydtin

Peter K Bachmann

Peter E Geittner

A method describing the manufacture and use of aqueous suspensions comprising fine-powdered ceramic solid particles, dispersing agents and, if necessary, binders, in which method the manufacture of the suspensions includes the following process steps which are carried out separately or in combination:

Method of manufacturing aqueous ceramic suspensions and the use of said

Method of and arrangement for manufacturing rotationally symmetrical porous solid bodies. A method of manufacturing rotationally symmetrical porous solid bodies, in which the starting material for the solid body in the form of a suspension consisting of the material for the solid body in solid form and a liquid dispersing agent, is introduced into a hollow mould whose geometry corresponds to that of the solid body to be formed, such that during the introduction of the suspension the hollow mould is rotated about its longitudinal axis, a certain quantity of solid of the suspension being deposited on the inner wall of the hollow mould, and excess residual suspension being removed, after which the green body thus formed is subjected to further process steps to manufacture the solid body, in which process suspension is introduced into the hollow mould in such doses that each time only thin solid layers having a thickness in the range from 10.sup.-3 to 5 mm are continuously deposited without interruption of the centrifuging process, the excess residual suspension being removed from the hollow mould in such a quantity that a layer of residual suspension having a thickness in the range from 10.sup.-1 to 100 mm always remains on top of the deposited solid matter. In this way, macroscopically homogeneously built porous solid bodies are obtained. FIG. 2.

Method for manufacturing rotationally symmetrical porous solid bodies

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Nidderau Heldenbergen, Germany

Gerd Romanowski