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:
Jan. 06, 2015
Filed:
Jun. 10, 2013
Applicant:
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Inventors:
Assignee:
NGK Spark Plug Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 35/119 (2006.01); C04B 35/56 (2006.01); C04B 35/106 (2006.01); C04B 35/645 (2006.01);
U.S. Cl.
CPC ...
C04B 35/106 (2013.01); C04B 35/119 (2013.01); C04B 35/5626 (2013.01); C04B 35/645 (2013.01); B23B 2226/18 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3246 (2013.01); C04B 2235/3843 (2013.01); C04B 2235/3847 (2013.01); C04B 2235/3856 (2013.01); C04B 2235/3886 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/6562 (2013.01); C04B 2235/72 (2013.01); C04B 2235/85 (2013.01); C04B 2235/96 (2013.01); C04B 2235/9607 (2013.01);
Abstract
A ceramic sintered body includes tungsten carbide, zirconia, and alumina. The content of the tungsten carbide is 20 to 50 vol %, and the content of the zirconia is 5 to 25 vol %. The crystal phase of the zirconia is a tetragonal crystal or a mixture of tetragonal and monoclinic crystals. The ceramic sintered body does not substantially include Ti compounds. The average particle diameter of the tungsten carbide, the average particle diameter of the zirconia, and the average particle diameter of the alumina are all 1 μm or less.