US 11,920,222 B2
Composite sintered material
Naoki Watanobe, Osaka (JP); Takashi Harada, Osaka (JP); Katsumi Okamura, Osaka (JP); Satoru Kukino, Itami (JP); and Taisuke Higashi, Itami (JP)
Assigned to Sumitomo Electric Industries, Ltd., Osaka (JP); and Sumitomo Electric Hardmetal Corp., Itami (JP)
Appl. No. 17/049,599
Filed by Sumitomo Electric Industries, Ltd., Osaka (JP); and SUMITOMO ELECTRIC HARDMETAL CORP., Itami (JP)
PCT Filed Apr. 3, 2019, PCT No. PCT/JP2019/014776
§ 371(c)(1), (2) Date Oct. 22, 2020,
PCT Pub. No. WO2019/208133, PCT Pub. Date Oct. 31, 2019.
Claims priority of application No. 2018-083374 (JP), filed on Apr. 24, 2018.
Prior Publication US 2021/0238716 A1, Aug. 5, 2021
Int. Cl. C22C 26/00 (2006.01); B23B 27/14 (2006.01); C22C 1/05 (2023.01)
CPC C22C 26/00 (2013.01) [B23B 27/148 (2013.01); C22C 1/05 (2013.01); B23B 2226/31 (2013.01); C22C 2026/007 (2013.01); C22C 2026/008 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A composite sintered material comprising: a plurality of diamond grains having an average grain size of less than or equal to 10 μm; a plurality of cubic boron nitride grains having an average grain size of less than or equal to 2 μm; a plurality of aluminum oxide grains having an average grain size of less than or equal to 0.5 μm; and a remainder of a binder phase, wherein
at least parts of adjacent diamond grains are bound to one another,
the binder phase includes cobalt,
in the composite sintered material, a content of the diamond grains is more than or equal to 30 volume % and less than or equal to 92 volume %, a content of the cubic boron nitride grains is more than or equal to 3 volume % and less than or equal to 40 volume %, a content of the aluminum oxide grains is more than or equal to 2 volume % and less than or equal to 15 volume %, and a content of the cobalt is more than or equal to 3 volume % and less than or equal to 30 volume %.