PRODUCTION OF CERAMIC HONEYCOMB STRUCTURE

Title:

PRODUCTION OF CERAMIC HONEYCOMB STRUCTURE

Document Type and Number:

WIPO Patent Application WO/1989/007584

Kind Code:

A1

Abstract:

This invention provides a method of firing a ceramic honeycomb structure which comprises varying the oxygen concentration in a firing atmosphere in a temperature range where a molding aid and/or a pore forming material is difficultly burnt or in a temperature range where they are burnt, to inhibit abrupt heat buildup of the aid etc., increasing the oxygen concentration in the atmosphere in a temperature range where the pore forming material and/or the molding aid is difficultly burnt to promote their combustion so as to reduce the temperature difference between the internal and external parts of the honeycomb structure, and making uniform the internal and external characteristics without causing any crack inside and at the end parts of the honeycomb structure and without causing internal melt loss. In this manner the method of the invention enables satisfactory firing. Moreover, since it is not necessary to reduce the firing rate, the firing schedule can be shortened and production efficiency can be improved. Accordingly, the present invention is particularly effective for a ceramic honeycomb structure.

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Inventors:

MIYAHARA KAZUHIRO (JP)

Application Number:

PCT/JP1989/000139

Publication Date:

August 24, 1989

Filing Date:

February 10, 1989

Export Citation:

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Assignee:

NGK INSULATORS LTD (JP)

International Classes:

C04B35/64; C04B38/00; C04B38/06; F27B9/26; (IPC1-7): C04B38/00; C04B35/64

Foreign References:

JPS54138005A	1979-10-26
JPS55144474A	1980-11-11

Other References: