Patent ID: 7744669

Claim:
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.