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. 12, 2022
Filed:
Sep. 18, 2018
Ngk Spark Plug Co., Ltd., Nagoya, JP;
Yoshito Kojima, Nagoya, JP;
Hiroshi Yonekura, Nagoya, JP;
Yusuke Katsu, Nagoya, JP;
Takeshi Mitsuoka, Nagoya, JP;
NGK SPARK PLUG CO., LTD., Nagoya, JP;
Abstract
Provided is a ceramic sintered body having high wear resistance and chipping resistance. Also provided are an insert, a cutting tool and a friction stir welding tool, each of which uses such a high-performance ceramic sintered body. The ceramic sintered body includes AlO(alumina), WC (tungsten carbide) and ZrO(zirconia), wherein Zr (zirconium) element is present at either one or both of: (1) a grain boundary between crystal grains of the AlO; and (2) a grain boundary of crystal grains of the AlO and crystal grains of the WC, wherein the ceramic sintered body contains 55.0 to 97.5 vol % of the WC, 0.1 to 18.0 vol % of the ZrO, and the balance being the AlO, and wherein the ZrOis in a phase of tetragonal structure (T) or a mixed phase of tetragonal structure (T) and monoclinic structure (M).