# US 12,109,630 B1 · Cemented carbide and cutting tool

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- Number: US 12,109,630 B1
- Document ID: US12109630B1
- Status: Granted
- Kind: B1
- Application number: 18/686,491
- Filed: 2023-07-28
- Granted: 2024-10-08
- Earliest claimed: 2023-07-28
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Yoshihiro Kimura; Yasuki Kido; Anongsack Paseuth
- Web page: https://patentgrep.com/patent/US12109630B1

## CPC

- B23B 27/148: {Composition of the cutting inserts}
- C22C 1/051: Making hard metals based on borides, carbides, nitrides, oxides or silicides; Preparation of the powder mixture used as the starting material therefor
- C22C 29/005: {comprising a particular metallic binder}
- C22C 29/02: based on carbides or carbonitrides
- C22C 29/067: {comprising a particular metallic binder}
- C22C 29/08: based on tungsten carbide
- B22F 2005/001: {Cutting tools, earth boring or grinding tool other than table ware}
- B23B 2222/28: Details of hard metal, i.e. cemented carbide
- C22C 2200/00: Crystalline structure
- B23B: TURNING; BORING (arrangements for copying or controlling B23Q)
- C22C: ALLOYS (treatment of alloys C21D, C22F)
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER

## Abstract

A cemented carbide includes a plurality of tungsten carbide particles and a binder phase, wherein the cemented carbide comprises at least one first element selected from the group consisting of titanium, tantalum, niobium, zirconium, cerium, yttrium, and boron, and wherein in a first graph in a coordinate system where an X axis is a distance from a position at which cobalt exhibits a maximum intensity, and a Y axis is a normalized intensity, a maximum peak M of each of the first element is present between a peak W1 of tungsten closest to an origin and a further peak W2 of tungsten closest to the peak W1, a ratio IB/IA of an intensity IB to a maximum peak intensity IA of the maximum peak M is 0.5 or less in each of the first element, and the intensity IB is an intensity of the first element at a distance P2.

## Claims

### Claim 1

A cemented carbide comprising a plurality of tungsten carbide particles and a binder phase, wherein
the cemented carbide comprises a total of 80% by volume or more of the tungsten carbide particles and the binder phase,
the cemented carbide comprises 0.1% by volume or more and 20% by volume or less of the binder phase,
the cemented carbide comprises at least one first element selected from the group consisting of titanium, tantalum, niobium, zirconium, cerium, yttrium, and boron,
the cemented carbide comprises a total of 0.01 atomic % or more and 20 atomic % or less of the first element, and
the binder phase comprises 50% by mass or more of cobalt, and wherein
in a first graph showing results obtained by carrying out line analysis by using an energy dispersive X-ray spectrometer attached to a transmission electron microscope along a first direction going from the binder phase to the tungsten carbide particles adjacent to each other, in a coordinate system where an X axis is a distance from a position at which cobalt exhibits a maximum intensity, and a Y axis is a normalized intensity,
a maximum peak M of each of the first element is present between a peak W1 of tungsten closest to an origin and a further peak W2 of tungsten closest to the peak W1,
a ratio IB/IA of an intensity IB to a maximum peak intensity IA of the maximum peak M is 0.5 or less in each of the first element, and
the intensity IB is an intensity of the first element at a distance P2, which is a distance of 0.2 nm from a distance P1 at the maximum peak intensity IA toward an opposite side of the origin.

### Claim 2 (depends on 1)

The cemented carbide according to claim 1, wherein the cemented carbide comprises 18% by volume or less of the binder phase.

### Claim 3 (depends on 1)

A cutting tool comprising a cutting edge formed from the cemented carbide according to claim 1.