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. 23, 1993
Filed:
Jan. 14, 1991
Junichiro Suzuki, Aichi, JP;
Minoru Nakamura, Aichi, JP;
NGK Spark Plug Co., Ltd., Aichi, JP;
Abstract
A process for preparation of heat-resistant and wear-resistant ceramic material which comprises sintering the material under a non-oxidizing atmosphere until the metal of a component (a) no longer exists as a metallic phase. A starting composition for forming the ceramic material comprises from 1 to 40 wt % of Al.sub.2 O.sub.3, from 0.05 to 8 wt % of sintering assistant, from 3 to 35 wt % total of one or both of ZrO.sub.2 and HfO.sub.2, and from 17 to 95.95 wt % of carbide components (a) and (b), or (a), (b), and (c), wherein component (a) is one or more metals selected from the Groupd IVB, VB, and VIB of the Periodic Table; component (b) is TiC, and component (c) is one or more metal carbides selected from Zr, Hf, and metals of Groups VB and VIB of the Periodic Table.