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. 21, 1992
Filed:
Apr. 16, 1991
Applicant:
Inventors:
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21D / ;
U.S. Cl.
CPC ...
148127 ; 156 84 ; 228903 ;
Abstract
In heat-connections between metal and ceramic, martensite stainless steel or martensite heat-resistant steel which can be hardened by quenching in a gas or vacuum after having been heated beyond the quench hardening temperature thereof are used as metal. The heat connection is by brazing or shrinkage fit at 800.degree. C. or more. Stress strain caused by a difference in thermal expansion coefficient between the two can be reduced. Further, since the metal can be connected to the ceramic while hardening the metal, man-hours can be reduced markedly.