Title:
CUBIC BORON NITRIDE SINTERED BODY TOOL
Document Type and Number:
WIPO Patent Application WO/2022/070677
Kind Code:
A1
Abstract:
This cubic boron nitride sintered body tool has a first sintered body at least at a cutting edge, the first sintered body containing a plurality of cBN particles. The cBN particles located on a surface of the cutting edge include a cubic boron nitride phase composed of cBN crystal structure, and a hexagonal boron nitride phase composed of hBN crystal structure. When the ratio Iπ*/Iσ* of the intensity of π* peak derived from π bonding in hBN in the hexagonal boron nitride phase to the intensity of σ* peak derived from σ bonding in hBN in the hexagonal boron nitride phase, and σ bonding in cBN in the cubic boron nitride phase is calculated by measuring an energy loss due to excitation of K-shell electrons of boron by TEM-EELS for the cBN particles on the surface of the cutting edge, the ratio Iπ*/Iσ* of the cBN particles on the surface of the cutting edge is between 0.1 and 2, and the ratio Iπ*/Iσ* of the cBN particles at a depth position of 5 μm from the surface of the cutting edge along the normal direction of the surface of the cutting edge is between 0.001 and 0.1.
Inventors:
HARADA TAKASHI (JP)
KUKINO SATORU (JP)
WATANOBE NAOKI (JP)
KUKINO SATORU (JP)
WATANOBE NAOKI (JP)
Application Number:
PCT/JP2021/030916
Publication Date:
April 07, 2022
Filing Date:
August 24, 2021
Export Citation:
Assignee:
SUMITOMO ELECTRIC HARDMETAL CORP (JP)
International Classes:
B23B27/14; B23B27/20; B23B51/00; B23C5/16; C04B35/5831
Domestic Patent References:
| WO2020009117A1 | 2020-01-09 | |||
| WO2012032966A1 | 2012-03-15 |
Foreign References:
| JP2006281386A | 2006-10-19 | |||
| JP2020037533W | 2020-10-02 | |||
| JP2016145131A | 2016-08-12 |
Other References:
See also references of EP 4091746A4
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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