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. 16, 1993
Filed:
Sep. 21, 1992
Yukihisa Wada, Aichi, JP;
NGK Insulators, Ltd., , JP;
Abstract
A ceramic honeycomb structural body-firing process includes the steps of: formulating a raw material from talc, kaolin and other cordierite-forming materials to give cordierite having a chemical composition of SiO.sub.2 : 42-56% by weight, Al.sub.2 O.sub.3 : 30-45% by weight and MgO: 12-16% by weight as a main component and a crystalline phase mainly composed of cordierite, shaping a honeycomb structural body from the resulting mixture by extrusion, and firing the honeycomb structural body. In the firing step, a heating rate in a temperature range in which the honeycomb structural body is thermally shrunk is set at not less than 20.degree. C./hr but not more than 60.degree. C./hr, the heating rate in a temperature range in which the solid phase reaction of the honeycomb structure body proceeds is set at not less than 80.degree. C./hr but not more than 130.degree. C./hr, and the heating rate in a temperature range in which the liquid phase reaction of the honeycomb structural body proceeds is set at not less than 20.degree. C./hr but not more than 60.degree. C./hr.