Method for improving the thermal shock resistance of a washcoate

Details Method for improving the thermal shock resistance of a washcoate Method for improving the thermal shock resistance of a washcoate

1993-05-18

1994-09-13

Beck, Shrive

Coating processes

With pretreatment of the base

Shielding or spacing

427299, 427307, 427333, 4274432, 428116, 502302, 502303, 502304, 423273, B05D 132

Patent

active

053467221

ABSTRACT:
A method for producing a thermally shock resistant washcoated substrate involves introducing a buffer solution into the microcracks, and optionally the micropores of a porous sintered body, the pH of the buffer solution being at a predetermined value to result in the formation of a gel on contact of the buffer solution with the slurry which is to be subsequently applied, contacting the body with a washcoating slurry to form a gel at the interface of the buffer solution and slurry. Formation of the gel prevents the slurry from entering the microcracks. The body is then calcined at a temperature and for a time sufficient to form the washcoated substrate.

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patent: 4831009 (1989-05-01), Retallick
patent: 5039650 (1991-08-01), Yamada et al.
patent: 5139993 (1992-08-01), Schmidt et al.
CRC Handbook of Chemistry and Physics, Buffer Solutions, p. D-186. 1978-1979.

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