CEMENTED CARBIDE, CUTTING TOOL CONTAINING SAME, AND PRODUCTION METHOD FOR CEMENTED CARBIDE

Title:

CEMENTED CARBIDE, CUTTING TOOL CONTAINING SAME, AND PRODUCTION METHOD FOR CEMENTED CARBIDE

Document Type and Number:

WIPO Patent Application WO/2019/207876

Kind Code:

A1

Abstract:

The cemented carbide comprises first hard phase particles including WC, second hard phase particles including a carbonitride containing at least Ti and Nb, and a metal binder phase including an iron group element. The second hard phase particles each comprise a granular core part and a peripheral part at least partly coating the core part. The core part includes a complex carbonitride expressed by Ti1-X-YNbXWYC1-ZNZ, wherein X is 0.1 to 0.2, Y is 0 to 0.05, and Z is 0.3 to 0.6. The peripheral part has a different composition from that of the core part. The absolute value of the difference between the occupancy area ratio (%) of the second hard phase particles in the surface of the cemented carbide and the occupancy area ratio (%) of the second hard phase particles in a region extending 0.5 mm from the surface in the depth direction is 10 or less.

Inventors:

FUKAE KOSUKE (JP)
GOTOU HIROAKI (JP)
MICHIUCHI MASATO (JP)
TSUDA KEIICHI (JP)

Application Number:

PCT/JP2019/002981

Publication Date:

October 31, 2019

Filing Date:

January 29, 2019

Export Citation:

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Assignee:

SUMITOMO ELECTRIC INDUSTRIES (JP)

International Classes:

C22C29/08; B23B27/14; B23B51/00; B23C5/16; C22C1/05

Domestic Patent References:

WO2011136197A1	2011-11-03
WO2018193659A1	2018-10-25
WO2011136197A1	2011-11-03

Foreign References:

JPS6389666A	1988-04-20
US20060093508A1	2006-05-04
JP2018085641A	2018-05-31

Other References: