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:
Sep. 04, 1990
Filed:
Sep. 20, 1989
NGK Insulators, Ltd., , JP;
Abstract
A ceramic heat transmission type or regenerative heat exchanger, including a plurality of matrix segments bonded together with a bonding material. A difference in coefficient of thermal expansion between the matrix segments and the bonding material is not more than 0.02% at 800.degree. C., and a Young's modulus of the bonding material is not less than 0.4 times to not more than 1.8 times that of the matrix segment. A process for producing the ceramic heat exchangers includes the steps of extruding and firing honeycomb structural segments in which a crystalline phase is mainly composed of cordierite and a coefficient of thermal expansion in an extending direction of flow channels is not more than 0.06% at 800.degree. C., machining an outer periphery of each of the segments, coating a bonding material around the outer periphery of each of the segments, bonding the segments together, and drying and firing the bonded segments. The bonding material has a coefficient of thermal expansion different from that of the matrix segments after the firing by not more than 0.02% at 800.degree. C., and a Young's modulus of the bonding material being not less than 0.4 time to not more than 1.8 times that of the matrix.