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. 30, 1999
Filed:
Apr. 14, 1997
Applicant:
Inventors:
Ulf Oscarsson, Tumba, SE;
Per Gustafson, Huddinge, SE;
Chris Chatfield, Gimo, SE;
Mikael Lagerquist, Upplands Vasby, SE;
Assignee:
Sandvik AB, Sandviken, SE;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428408 ; 428212 ; 428216 ; 428220 ; 428457 ; 428472 ; 428688 ; 428689 ; 428698 ; 428701 ; 428702 ; 427 34 ; 4272552 ; 4272553 ; 427309 ; 264 62 ; 264 65 ; 264 66 ;
Abstract
The present invention discloses a method of sintering of cemented carbide or cermet bodies lying on graphite trays. By using graphite trays coated with a covering layer of Y.sub.2 O.sub.3 containing .ltoreq.20 wt-% ZrO.sub.2, or corresponding volumetric amount of other refractory oxides, e.g., Al.sub.2 O.sub.3 or combinations thereof, with an average thickness of .gtoreq.10 .mu.m, the life of the trays between regrindings and recoatings can be largely extended.