Method for producing a ceramic filter body

US8551272B2 · kind B2 · utility

Assignee

• MANN+HUMMEL GmbH · DE

Inventors

• Jochen Linhart · Waiblingen, DE
• Andreas Franz · Ludwigsburg, DE

Key dates

• Filing date: Nov 26, 2007
• Grant date: Oct 8, 2013
• Expiry date: Sep 19, 2029

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B01D46/0001
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

The invention concerns a method for producing a ceramic filter body (1) for filtering an exhaust gas stream (2) of a diesel engine. The filter body (1) has planar and porous filter sections (3) that are designed to be passed by the exhaust gas flow (2) in a direction transverse to the face of the filter sections (3). A planar permeable fiber web (4, 4′), in particular of filter paper, is first impregnated with finely ground ceramic material (6) only across sections under formation of a non-impregnated section (12). The only partially ceramic-impregnated fiber web (4, 4′) is subsequently brought into the shape of a blank of the filter body (1) in such a way that the impregnated areas of the fiber web (4, 4′) assume the shape of the filter body (1). The fiber web (4, 4′) impregnated section-wise with the ceramic material (6) and shaped is subsequently sintered under heat in such a way that the fibers (5) of the fiber web are burned off and the ceramic material (6) is sintered under formation of the filter body (1) with filter sections (3) that are continuously porous and gas-permeable between their two faces (7, 8).