US 12,409,498 B2
Cemented carbide and cutting tool
Yasuki Kido, Itami (JP); Yoshihiro Kimura, Osaka (JP); Atsuhiro Yoneda, Itami (JP); Yuki Tanaka, Itami (JP); and Keiichi Tsuda, Itami (JP)
Assigned to SUMITOMO ELECTRIC HARDMETAL CORP., Itami (JP); and SUMITOMO ELECTRIC INDUSTRIES, LTD., Osaka (JP)
Appl. No. 18/840,632
Filed by Sumitomo Electric Hardmetal Corp., Itami (JP); and Sumitomo Electric Industries, Ltd., Osaka (JP)
PCT Filed Jan. 30, 2024, PCT No. PCT/JP2024/002896
§ 371(c)(1), (2) Date Aug. 22, 2024,
PCT Pub. No. WO2025/163758, PCT Pub. Date Aug. 7, 2025.
Prior Publication US 2025/0242415 A1, Jul. 31, 2025
Int. Cl. B23B 27/14 (2006.01); C23C 14/06 (2006.01); C23C 14/32 (2006.01); C23C 16/27 (2006.01)
CPC B23B 27/148 (2013.01) [C23C 14/0605 (2013.01); C23C 14/325 (2013.01); C23C 16/271 (2013.01); B23B 2224/00 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A cemented carbide consisting of a first hard phase, a plurality of second hard phases, and a binder phase,
wherein the first hard phase is composed of a plurality of tungsten carbide grains,
a D10 of grain sizes of the tungsten carbide grains is 0.40 μm or more,
a D90 of grain sizes of the tungsten carbide grains is 2.00 μm or less,
the second hard phases are composed of at least one first compound selected from the group consisting of TaNbC, TaNbN, TaNbCN, TiCN, TiNbC, TiNbN, and TiNbCN,
the cemented carbide includes 0.30% by volume or more and 1.60% by volume or less of the second hard phases,
in a cross section of the cemented carbide, an average of circularities of the second hard phases is 0.10 or more and 0.32 or less,
a standard deviation of the circularity is 0.094 or more and 0.130 or less,
the binder phase includes 50% by mass or more of cobalt, and
the cemented carbide includes 8.0% by volume or more and 12.0% by volume or less of the binder phase.