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. 22, 1980
Filed:
Mar. 15, 1979
Applicant:
Inventors:
Arun K Varshneya, Chesterland, OH (US);
William L Taylor, East Cleveland, OH (US);
Assignee:
General Electric Company, Schenectady, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C03C / ; C03C / ; H01J / ; H01J / ;
U.S. Cl.
CPC ...
313221 ; 106 / ; 428432 ; 428433 ; 428472 ;
Abstract
An improved sealing composition for use between alumina ceramic parts, or between alumina ceramic and refractory metal, is based on 40 wt% Al.sub.2 O.sub.3, 35 wt% CaO, 15 wt% BaO and 10 wt% SrO, and has an average thermal expansion coefficient of 95.times.10.sup.-7 /.degree.C. between 25.degree. C. and 600.degree. C. This composition after sealing achieves a closer match to the coefficient of thermal expansion of high density polycrystalline alumina (86.times.10.sup.-7 /.degree.C.) than previously available materials. In addition, it has a wider sealing range which facilitates seal processing.