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:
Nov. 02, 1993
Filed:
Dec. 06, 1991
Gregory A Merkel, Big Flats, NY (US);
Martin J Murtagh, Trumansburg, NY (US);
Corning Incorporated, Corning, NY (US);
Abstract
A body is made up of at least about 93% by weight cordierite, having a coefficient of thermal expansion of no greater than about 4.times.10.sup.-7 .degree.C.sup.-1, from about 25.degree. C. to about 800.degree.0 C., and a total porosity of greater than about 42%. A method for producing the body which includes selecting raw materials to form a composition which forms cordierite on firing, the raw materials being composed of: talc having a BET surface area of no greater than about 5 m.sup.2 /g, 0 to about 48% by weight of clay, which can be platelet clay, stacked clay which can be delaminated into platelets during processing, and mixtures thereof, an aluminum oxide yielding component having an average particle size of either about 3 to about 8 micrometers in diameter, or no greater than about 3 micrometers in diameter, and free silica, intimately blending the raw materials with an effective amount of vehicle and forming aids to impart plastic formability and green strength to the raw materials and to form a plastic mixture therefrom. If the particle size of the aluminum oxide yielding component is no greater than about 3 micrometers in diameter, the raw materials are blended additionally with a burnout agent. The raw materials are formed into a green body which is dried and fired at a sufficient temperature for a sufficient time to form the cordierite body.