Hartmetall und Schneidwerkzeug

Details

Veröffentlichungs-Nr.

EP4715077

Anmeldetag

18. Juni 2024

Veröffentlichung

26. Dezember 2025

Rechtsraum

EP

IPC

C22C29/08, C22C1/051

Abstract

A cemented carbide includes a first phase and a second phase, wherein the first phase consists of a plurality of tungsten carbide grains, a content ratio of the first phase of the cemented carbide is 65 volume% or more and 85 volume% or less, a content ratio of the second phase of the cemented carbide is 4 volume% or more and 25 volume% or less, the second phase includes 50 mass% or more of cobalt, the second phase includes zirconium, a cobalt content ratio M_Co of the cemented carbide is 3 mass% or more and 15 mass% or less, a and b of the cemented carbide indicate a relation of the following formula I: b<0.0485a+0.0001 wherethe a represents a percentage, (M_Zr/M_Co)× 100, of a zirconium content ratio M_Zr of the cemented carbide in mass% with respect to the cobalt content ratio M_Co of the cemented carbide in mass%, the a is more than 0 and 8 or less, the b represents an area percentage of pore in a first region of a cross section of the cemented carbide, and the first region is a region located within a distance of 50 µm from a surface of the cemented carbide in the cross section.

Anmelder

Firma

Sumitomo Electric Hardmetal Corp.

Land

🇯🇵 Japan

Fachgebiete