Title:
SUPER-HARD ALLOY AND CUTTING TOOL
Document Type and Number:
WIPO Patent Application WO/2019/138599
Kind Code:
A1
Abstract:
This super-hard alloy has a first hard phase comprising tungsten carbide particles and a bonding phase containing Co and Cr, wherein a WC/WC interface is defined as a region in which the distance X between surfaces of the tungsten carbide particles that adjoin each other over a facing surface length L of 100 nm or more is 5 nm or less in an arbitrary surface or an arbitrary cross section of the super-hard alloy, and at the WC/WC interface where the distance X is 1-5 nm and the concentration of Co atoms is 2 at% higher than the average concentration of Co atoms in the inner part of the tungsten carbide particles, the ratio of the concentration C of Co atoms (C) and the concentration C of Cr atoms (R) (C(R)/C(C)) is 0.17 or more.
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Inventors:
KIDO YASUKI (JP)
TABAYASHI DAIJI (JP)
IMAMURA SHINYA (JP)
TABAYASHI DAIJI (JP)
IMAMURA SHINYA (JP)
Application Number:
PCT/JP2018/028548
Publication Date:
July 18, 2019
Filing Date:
July 31, 2018
Export Citation:
Assignee:
SUMITOMO ELECTRIC HARDMETAL CORP (JP)
International Classes:
C22C29/08; B23B27/14; B23B51/00; B23C5/16; C22C1/05
Foreign References:
| JP2014210314A | 2014-11-13 | |||
| JP2002205207A | 2002-07-23 | |||
| JP2007223001A | 2007-09-06 | |||
| JP2009083086A | 2009-04-23 | |||
| JP2018000946A | 2018-01-11 | |||
| JP2004256852A | 2004-09-16 | |||
| JP2005068515A | 2005-03-17 | |||
| JP2017088917A | 2017-05-25 |
Other References:
See also references of EP 3739074A4
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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