US 12,337,390 B1
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. 18/840,915
Filed by Sumitomo Electric Hardmetal Corp., Itami (JP); and Sumitomo Electric Industries, Ltd., Osaka (JP)
PCT Filed Jan. 30, 2024, PCT No. PCT/JP2024/002894
§ 371(c)(1), (2) Date Aug. 23, 2024,
.
Int. Cl. B23B 27/00 (2006.01); B23B 27/14 (2006.01); C23C 16/27 (2006.01)
CPC B23B 27/148 (2013.01) [C23C 16/271 (2013.01); B23B 2224/00 (2013.01)] 4 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, a median of areas of the second hard phases is 0.90 μm2 or more and 1.20 μm2 or less,
a coefficient of variation of the areas of the second hard phases is 0.50 or more and 1.20 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.