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:
Mar. 07, 2000
Filed:
Jan. 22, 1999
Applicant:
Inventors:
Yong Kee Baek, Daejon, KR;
Hyoun-Ee Kim, Seoul, KR;
Young Hak Ko, Seoul, KR;
Eul-Son Kang, Daejon, KR;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C / ; C23C / ;
U.S. Cl.
CPC ...
42722521 ; 42725527 ; 42725536 ; 4272554 ; 427377 ; 427399 ;
Abstract
A method for strengthening and aging-prevention of a TZP ceramics includes the steps of: introducing TZP ceramic and Si-based ceramic powders into a furnace in which a water vapor pressure is controlled; and exposing the TZP ceramic next to Si-based ceramic in a flowing H.sub.2 atmosphere containing H.sub.2 O of no more than 0.1%, to form a silica/zircon layer on the surface of the TZP ceramic.