Plugging material for aluminum titanate ceramic wall flow filter manufacture
AssigneeCorning Incorporated
InventorsRobert John Paisley, Patrick David Tepesch
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Abstract
Disclosed are plugging mixtures for a ceramic wall flow filter, comprising an aluminum titanate precursor reactive batch composition including an alumina source, a silica source, and a titania source; a sintering aid; an organic binder; and a liquid vehicle. Also disclosed are ceramic wall flow filters comprised of end plugs formed from the plugging mixtures of the present invention and methods for the manufacture thereof.
Claims5
A method for manufacturing a porous ceramic wall flow filter having a ceramic honeycomb structure and a plurality of channels bounded by porous ceramic walls, with selected channels each incorporating a plug sealed to the channel wall, comprising the steps of:
- providing a fired honeycomb structure having a plurality of channels bounded by parallel walls, wherein the honeycomb structure was formed from a first aluminum titanate batch composition and fired at a peak firing temperature in the range of 1350° C. to 1500° C.,
- selectively plugging at least one predetermined channel with a plugging mixture comprising an aluminum titanate batch composition different from the first aluminum titanate batch composition of the fired honeycomb structure;
- a sintering aid;
- an organic binder;
- and a liquid vehicle;
- to form a selectively plugged honeycomb structure;
- and
- firing the selectively plugged honeycomb structure under conditions effective to fire the plugging mixture and form a fired plug in the at least one selectively plugged channel, wherein the conditions effective to fire the plugging mixture comprise firing at a temperature at least about 50° C. lower than the peak firing temperature.
Dependencies are inferred from the claim text.