Method of making silicon nitride-bonded silicon carbide honeycomb filters

US6699429B2 · kind B2 · utility

Assignee

• CORNING INCORPORATED · US

Inventors

• Yanxia Ann Lu · Corning, US
• Dale R. Wexell · Corning, US
• Elizabeth Margaret Wheeler · Lindley, US

Key dates

• Filing date: Aug 1, 2002
• Grant date: Mar 2, 2004
• Expiry date: Nov 14, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B38/0006
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

A process for forming a silicon nitride-bonded silicon carbide honeycomb monolith by a) forming a plasticizable mixture which includes (1) about 60% to 85% by weight, powdered silicon carbide with a median particle size of about 10-40 micrometers; (2) about 15% to 40% by weight, powdered silicon metal with a median particle size of about 5-20 micrometers; and, (3) organic components; b) extruding the plasticizable mixture to form a green honeycomb monolith; c) drying the green honeycomb monolith; and, d) heating the honeycomb monolith to 1450° C. with a hold of 1 hour in an atmosphere of argon; and, e) nitriding the honeycomb monolith between 1450° C. to 1600° C. for a time sufficient to obtain a silicon nitride-bonded silicon carbide body.