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. 24, 2017
Filed:
Dec. 27, 2013
Applicant:
Ngk Spark Plug Co., Ltd., Nagoya, Aichi, JP;
Inventors:
Assignee:
NGK SPARK PLUG CO., LTD., Aichi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C04B 35/10 (2006.01); C04B 35/56 (2006.01); C04B 35/119 (2006.01); C04B 35/626 (2006.01); C04B 35/645 (2006.01);
U.S. Cl.
CPC ...
C04B 35/10 (2013.01); C04B 35/119 (2013.01); C04B 35/5626 (2013.01); C04B 35/62685 (2013.01); C04B 35/645 (2013.01); C04B 2235/3206 (2013.01); C04B 2235/3208 (2013.01); C04B 2235/3217 (2013.01); C04B 2235/3224 (2013.01); C04B 2235/3225 (2013.01); C04B 2235/3241 (2013.01); C04B 2235/3244 (2013.01); C04B 2235/3251 (2013.01); C04B 2235/3272 (2013.01); C04B 2235/3839 (2013.01); C04B 2235/3843 (2013.01); C04B 2235/3847 (2013.01); C04B 2235/5436 (2013.01); C04B 2235/5445 (2013.01); C04B 2235/80 (2013.01); C04B 2235/85 (2013.01); C04B 2235/96 (2013.01); C04B 2235/9607 (2013.01);
Abstract
In a ceramic composition mainly composed of alumina (AlO), tungsten carbide (WC) and zirconia (ZrO), zirconium (Zr) is distributed in a first grain boundary as an interface where an alumina (AlO) crystal grain is adjacent to a tungsten carbide (WC) crystal grain and in a second grain boundary as an interface where two alumina (AlO) crystal grains are adjacent to each other.