C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
25/131
C08J 9/16 (2006.01) B01D 39/20 (2006.01) B28B 3/12 (2006.01) C04B 38/06 (2006.01)
Patent
CA 1082894
ABSTRACT OF THE DISCLOSURE Ceramic foams possessing controlled permeability and uniformity are prepared by a combined rolling operation of impregnating an open-celled organic polymer foam material possessing a predetermined permeability and resilience with a fluid aqueous slurry of a thixotropic ceramic composition and immediate passage through at least two controlled roll gaps, wherein the rolls are preset to effect a temporary compression ranging from about 50 to 90% for the first pass and 70 to 90% for the second pass. The resulting material is thereby uniformly impregnated with the required amount of slurry, and is then dried and heated to remove the organic foam component. The foams prepared in accordance with the present invention are useful as filters for molten metals, especially aluminum and its alloys.
290494
Dore James E.
Preuss Robert K.
Yarwood John C.
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
Swiss Aluminium Ltd.
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