Method of sealing open ends of ceramic honeycomb structural body
AssigneeNGK Insulators, Ltd.
InventorsYutaka Ogawa, Shunichi Yamada, Toshiyuki Hamanaka
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Abstract
The disclosed method seals preselected open ends of channels of a ceramic honeycomb structural body by attaching a film to that end surface of the honeycomb structural body which is to be selectively sealed while boring holes on the film at positions corresponding to desired open ends of the channels to be sealed, dipping the end surface in a sealing material containing slurry, pressing sealing material mixture body in the desired channels open ends, and then firing the ceramic honeycomb structural body with the sealing materials applied thereto.
Claims11
A method of sealing open ends of channels in a ceramic honeycomb structural body, comprising the steps of attaching a film on an end surface of a ceramic honeycomb structural body which is to be selectively sealed, said attached film having holes bored at positions corresponding to open ends of channels to be sealed, dipping said end surface having the film attached thereto into a sealing slurry mixture, whereby only an end portion of the ceramic honeycomb structural body is exposed to the slurry, resulting in the slurry adhering to walls of the channels to be sealed, subsequently passing a kneaded pasty sealing material green body into the ends of the channels which have slurry adhering thereto, and firing the ceramic honeycomb structural body, whereby said adhered slurry and said kneaded pasty material seal the selected channels.
A method of sealing open ends of channels in a ceramic honeycomb structural body, comprising of the steps of attaching a film on an end surface of a ceramic honeycomb structural body which is to be selectively sealed, said attached film having holes bored at positions corresponding to open ends of channels to be sealed, dipping said end surface having the film attached thereto into a sealing slurry mixture, whereby only an end portion of the ceramic honeycomb structural body is exposed to the slurry, said mixture consisting essentially of 40-60 parts by weight of cordierite composition green materials selected from the group consisting of kaolin, talc, and alumina, 40-60 parts by weight of water, and 1 part by weight of carboxymethylcellulose, resulting in the slurry adhering to walls of the channels to be sealed, subsequently passing a kneaded pasty sealing material green body consisting essentially of 100 parts by weight of cordierite powder, 1 part by weight of methyl cellulose, 10 parts by weight of glycerin, and 20-30 parts by weight of water into the ends of the channels which have slurry adhering thereto, and firing the ceramic honeycomb structural body, whereby said adhered slurry and said kneaded pasty materials seal the selected channels.
Dependencies are inferred from the claim text.