Multicellular monolithic ceramic body and preparation thereof
AssigneeAsahi Glass Company, Limited
InventorsYasuhiko Endo, Takashi Mimori, Motohiro Goto
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Abstract
A multicellular monolithic ceramic body having many gas passages partitioned by thin walls is made of aluminum titanate as a major cnstituent and has less than 0.15% of a thermal expansion coefficient at 1000.degree. C. and higher than 350 kg./cm.sup.2 of a compressive strength as zero of an open frontal area as the properties in the direction along the gas passages and more than 35% of a porosity.
Claims20
A multicellular monolithic ceramic body having many gas passages partitioned by thin walls, consisting essentially of:
- aluminum titanate as the major constituent and from 4 to 10 wt. % SiO.sub.2, said ceramic body having a thermal expansion coefficient less than 0.15% at 1000.degree. C., a compressive strength greater than 350 kg/cm.sup.2 as taken along the direction of the gas passages based only on the solid surface of said body and not including open areas of said body and a porosity of greater than 35%.
A process for preparing a multicellular monolithic ceramic body having many gas passages therein, partitioned by thin walls, comprising:
- (a) extruding a plastic ceramic composition comprising aluminum titanate or an aluminum titanate precursor as the principal constituent and from 4% to 10% by wt. of SiO.sub.2 based on the metal oxide components of the composition through an extruding dye;
- and
- (b) calcining the extruded mass at a temperature of 1350.degree. to 1500.degree. C., thereby obtaining said ceramic body having a thermal expansion coefficient less than 0.15% at 1000.degree. C., a compressive strength greater than 350 kg/cm.sup.2 as taken along the direction of the gas passages based only on the solid surface of said body and not including open areas of said body and a porosity of greater than 35%.
Dependencies are inferred from the claim text.