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:
Jul. 15, 2025
Filed:
Oct. 28, 2020
Ntk Cutting Tools Co., Ltd., Komaki, JP;
NTK CUTTING TOOLS CO., LTD., Komaki, JP;
Abstract
A cutting tool () formed of a silicon nitride-based sintered body () including a matrix phase (), a hard phase (), and a grain boundary phase () in which a glass phase () and a crystal phase () exist. The sintered body () contains yttrium in an amount of 5.0 wt % to 15.0 wt % in terms of an oxide, and contains titanium nitride as the hard phase () in an amount of 5.0 wt % to 25.0 wt %. In an X-ray diffraction peak, a halo pattern appears at 2θ ranging from 25° to 35° in an internal region of the sintered body (). A ratio B/A of a maximum peak intensity B to a maximum peak intensity A satisfies 0.11≤B/A≤0.40 . . . Expression (1) in a surface region of the sintered body (), and satisfies 0.00≤B/A≤0.10 . . . Expression (2) in the internal region of the sintered body ().