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, 2003
Filed:
Jul. 18, 2001
Mitsuyoshi Nagano, Fukuoka, JP;
Shigeya Sakaguchi, Fukuoka, JP;
Norimitsu Mukae, Fukuoka, JP;
Kouki Minamoto, Fukuoka, JP;
Toyoshige Sasaki, Fukuoka, JP;
Nippon Tungsten Co., Ltd., Fukuoka, JP;
Abstract
A WC-based composite ceramics sintered body consisting of 40 volume % to 90 volume % of WC including solid-solved oxygen represented by a chemical formula of WC O (where 0.005<y/x+y<0.05), with the remainder being partially stabilized ZrO and inevitable impurities, wherein partially stabilized ZrO includes one or more of stabilizers selected from the group consisting of Y O , CeO and MgO. A prepared powder of raw material is held in an atmosphere containing oxygen in a temperature range of 200° C. to 600° C. for 0.1 hour to 3 hours to provide WC grains including solid-solved oxygen represented by a chemical formula of WC O (where 0.005<y/x+y<0.05). Partially stabilized Zro including one or more of stabilizers selected from the group consisting of Y O , CeO and MgO is used as a phase for filling up the grain boundary of the WC grains. A ceramic sintered body capable of sufficiently fulfilling various properties, such as of Young's modulus, hardness, heat conductivity and electrical workability, which are required as materials for sliding parts, edged tools and dies can be obtained.