Composite cordierite filters

US6736875B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• Kishor Purushottam Gadkaree · Big Flats, US
• Yanxia Ann Lu · Corning, US
• Joseph F. Mach · Lindley, US
• Christopher John Warren · Waverly, US
• Yuming Xie · Beijing, CN

Key dates

• Filing date: Dec 13, 2001
• Grant date: May 18, 2004
• Expiry date: Apr 3, 2022

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24149
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

Composite cordierite honeycomb structures especially suitable for diesel exhaust filtration applications comprise a non-oxide polycrystalline phase constituting 10-70% by weight, with the remainder of the ceramic material constituting a cordierite phase, the non-oxide polycrystalline phase being selected from the group consisting of carbides, nitrides, and borides. Preferably the non-oxide phase is either polycrystalline silicon carbide or polycrystalline silicon nitride and has a particle aspect ratio of less than 3. Inventive ceramic bodies are porous with an open porosity of at least 30%, preferably between 40% and 60%, and a median pore size of at least 5 micrometers, more preferably greater than 8 micrometers and less than 12 micrometers.