US 11,752,559 B2
Cubic boron nitride sintered material and cutting tool including same
Yuichiro Watanabe, Osaka (JP); Katsumi Okamura, Osaka (JP); Akito Ishii, Osaka (JP); Yoshiki Asakawa, Hyogo (JP); Akihiko Ueda, Hyogo (JP); Satoru Kukino, Hyogo (JP); and Hisaya Hama, Hyogo (JP)
Assigned to Sumitomo Electric Industries, Ltd., Osaka (JP); and SUMITOMO ELECTRIC HARDMETAL CORP., Hyogo (JP)
Appl. No. 18/18,087
Filed by SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP); and SUMITOMO ELECTRIC HARDMETAL CORP., Hyogo (JP)
PCT Filed Jul. 30, 2021, PCT No. PCT/JP2021/028502
§ 371(c)(1), (2) Date Jan. 26, 2023,
PCT Pub. No. WO2022/025292, PCT Pub. Date Feb. 3, 2022.
Claims priority of application No. 2020-130672 (JP), filed on Jul. 31, 2020.
Prior Publication US 2023/0211422 A1, Jul. 6, 2023
Int. Cl. B23B 27/14 (2006.01)
CPC B23B 27/148 (2013.01) [B23B 2226/125 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A cubic boron nitride sintered material comprising: cubic boron nitride particles in an amount of 70 vol % or more and less than 100 vol %, and a bonding material, wherein
the bonding material comprises an aluminum compound, and comprises cobalt as a constituent element;
the cubic boron nitride sintered material has a first region in which a space between adjacent cubic boron nitride particles is 0.1 nm or more and 10 nm or less;
when the first region is analyzed by using an energy dispersive X-ray analyzer equipped with a transmission electron microscope, an atom % of aluminum in the first region is 0.1 or more; and
the first region is observed in 6 or more among 10 images of 100 nm×100 nm in size that are generated by imaging, at a magnification of 2,000,000×, a region in which a structure like an interface of the adjacent cubic boron nitride particles is formed in the cubic boron nitride sintered material.