公开(公告)号：EP4509623A1

公开(公告)日：2025-02-19

申请号：EP23934305.6

申请日：2023-06-21

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： KIDO, Yasuki ,  KIMURA, Yoshihiro ,  PASEUTH, Anongsack

IPC: C22C29/08

Abstract: 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 0.03 atomic % or more and 0.90 atomic % or less of vanadium, the cemented carbide comprises 0.01 atomic % or more and 1.20 atomic % or less of chromium, the binder phase comprises 50% by mass or more of cobalt, and wherein in a first region of 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 position X1 provided in the tungsten carbide particles to position X2 provided in the binder phase adjacent to the tungsten carbide particles, in a coordinate system where an X axis is a distance from position X1 and a Y axis is an intensity, a distance P W at a maximum intensity I W of tungsten, a maximum distance P W70 showing an intensity I W70 of 70% of the maximum intensity I W , a distance P V at a maximum intensity I V of vanadium, a distance P Cr at a maximum intensity I Cr of chromium, a minimum distance P Co70 showing an intensity I Co70 of 70% of a maximum intensity I Co of cobalt, and a distance P Co at the maximum intensity I Co show a relationship Pw W70 Cr Co70 Co , and the first region is a region between a distance P1, which is a distance of 3 nm from the P V toward an origin side of the coordinate system, and a distance P2, which is a distance of 3 nm from the P V toward an opposite side of the origin, on the X axis in the first graph.

公开(公告)号：EP4471167A1

公开(公告)日：2024-12-04

申请号：EP23921031.3

申请日：2023-02-07

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： KIDO, Yasuki ,  KIMURA, Yoshihiro ,  PASEUTH, Anongsack

IPC: C22C29/08 ,  B23B51/00 ,  C22C1/051

Abstract: 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, hafnium, and molybdenum, the cemented carbide comprises a total of 0.01 atomic % or more and 10.0 atomic % or less of the first element, the binder phase comprises 50% by mass or more of cobalt, and the first element is not segregated in a first interface region between the tungsten carbide particles adjacent to each other.

公开(公告)号：EP4397779A1

公开(公告)日：2024-07-10

申请号：EP22958303.4

申请日：2022-11-18

Applicant: SUMITOMO ELECTRIC INDUSTRIES, LTD.

Inventor： KIDO, Yasuki ,  KIMURA, Yoshihiro ,  PASEUTH, Anongsack

IPC: C22C29/08 ,  B23B27/14 ,  C22C1/051

Abstract: A cemented carbide composed of a first hard phase, a second hard phase and a binder phase, in which the first hard phase is composed of tungsten carbide particles, the second hard phase is composed of at least one first compound selected from the group consisting of TiNbC, TiNbN and TiNbCN, the second hard phase has an average particle diameter of 0.25 µm or less, the second hard phase has a dispersity of more than 0.70 and 17.0 or less, the second hard phase has a content of 0.1 vol% or more and 15 vol% or less, the binder phase contains at least one first element selected from the group consisting of iron, cobalt and nickel, and the binder phase has a content of 0.1 vol% or more and 19.0 vol% or less.