Methods for the manufacture of porous ceramic shapes containing membraneous surfaces
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United States of America Patent
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Jul 11, 1989
Grant Date -
N/A
app pub date -
Dec 2, 1987
filing date -
Dec 2, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Described herein are porous ceramic articles comprised of a porous ceramic body portion (of either predominantly open- or predominantly closed-cell porosity) having, integral with pre-selected surfaces thereof, a thin porous ceramic membrane layer which itself may be of open- or closed-celled porosity. Also described are methods of bringing about such membrane layers and such articles. The invention is particularly useful for providing porous ceramic filtering elements, such as diesel particulate traps, wherein the body portion has a predominant open-celled porosity and wherein the porous ceramic membrane surfaces also are open-celled porosity but whose pores are smaller than those of the body portion, as well as for providing articles such as kiln furniture having smooth porous ceramic membrane layers or skins on pre-selected surfaces.
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