The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 25, 1995
Filed:
Nov. 20, 1992
Robert J Locker, Corning, NY (US);
Martin J Murtagh, Trumansburg, NY (US);
Corning Incorporated, Corning, NY (US);
Abstract
Cordierite-containing articles are produced by a method comprising the steps of providing raw materials including including alumina-yielding ingredients, magnesia-yielding ingredients, and silica-yielding ingredients, suitable to form an analytical batch composition by weight on an oxide basis of 9-20 weight percent MgO, 30-50 weight percent Al.sub.2 O.sub.3, and 41-56.5 weight percent SiO.sub.2. The raw materials include talc having a BET surface area of no greater than about 4.0 m.sup.2 /g, and uncalcined clay having an average particle size of no greater than about 2.0 .mu.m. The raw materials are blended with an effective amount of vehicle and forming aids to form a plastic mixture. The plastic mixture is anisostatically formed into a green body and dried. The dried green body is fired at a temperature and for a time effective to form a cordierite/containing ceramic article. The cordierite-containing articles exhibit a coefficient of thermal expansion of not greater than about 4.0.times.10.sup.-7 /.degree.C. and transverse I ratios of not less than about 0.85. The method of the present invention is particularly useful in forming cordierite honeycomb structures used as catalyst supports for automobiles or as particulate filters for the exhaust fluids of diesel engines.