Method for manufacturing ceramic filter

摘要

Honeycomb ceramic wall flow filters exhibiting reduced plug depth variability, produced by introducing flowable ceramic plugging cements into the ends of selected channels in the honeycombs and wherein the ceramic plugging cements consist of shear-conditioned mixtures exhibiting reduced viscosity differentials.

主权项

1. A method for manufacturing a honeycomb ceramic wall flow filter comprising:
mixing flowable ceramic plugging cement to a viscosity not more than 80% above a shear-thinned minimum for the cement composition to form a shear-conditioned flowable ceramic plugging cement; introducing a charge of the shear-conditioned flowable ceramic plugging cement into a cement chamber occupied by a piston; and injecting a controlled portion of the charge of the flowable ceramic plugging cement from the cement chamber occupied by the piston into ends of selected channels of a honeycomb body, wherein the mixing the flowable ceramic plugging cement to a viscosity not more than 80% above a shear-thinned minimum for the cement composition is spaced apart from the ends of the channels of the honeycomb body by at least the cement chamber, and wherein the shear-conditioned flowable ceramic plugging cement is static for a period of time in the cement chamber.