Method of making diesel particulate filters

Details Method of making diesel particulate filters Method of making diesel particulate filters

1992-01-03

1993-02-02

Aftergut, Karen

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Of inorganic materials

264 60, 264 63, 26417711, 26417712, 264211, 26421111, 264267, 264DIG48, B29C 4700, C04B 3332, C04B 3564, C04B 4181

Patent

active

051836084

ABSTRACT:
Porous ceramic articles are made by a method that allows the formed green body to be dried in a dielectric oven without arcing or shorting occurring while maintaining favorable physical properties. The method includes adding water insoluble cellulose and graphite to the ceramic-forming precursors as a burnout material. The method is particularly useful in forming porous cordierite articles that are extruded to form a honeycomb structure conventionally used as a particulate filter for the exhaust fluids of diesel engines. Such articles have a matrix of thin walls forming a multiplicity of open-ended cells extending from one end to another end of the honeycomb. The thin walls have a substantially smaller coefficient of thermal expansion in the direction parallel to the axes of the open-ended cells than in the direction transverse to the thin walls.

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