Kyocera Corporation

Katsuhiro Hanaki

Hideyoshi Kinoshita

Kouji Hirosaki

A hard alloy and a cutting tool. The hard alloy includes a hard phase and a binder phase. The hard phase includes: a main phase containing 50-70 mass % of WC, 15-30 mass % of TiCN, and 0-10 mass % of at least one kind of carbide, nitride or carbonitride of one or more non-W, non-Ti periodic table Group 4, 5 or 6 metal; a WC phase; and a composite hard phase. The binder phase includes 6 to 12 mass % of at least one of Co and Ni. The hard alloy includes a surface portion at a surface thereof, the surface portion having a WC content higher than that of an internal portion thereof. An average size of grains in the WC phase in the surface portion is larger than an average size of grains in the WC phase in the internal portion.

Hard alloy and cutting tool

A sintered cermet of a rotary tool has a hard phase with a first hard phase and a second hard phase comprising a carbide, a nitride, and a carbonitride of at least one of group 4, 5, and 6 metals of the periodic table of which metals the metal titanium is a main component. The result of an X-ray diffraction measurement in a surface region of the sintered cermet provides a first peak intensity Ib on a high angle side that is attributable to a (220) plane of the first hard phase and a second peak intensity Ia on a low-angle side that is attributable to a (220) plane of the second hard phase, and an intensity ratio Ib/Ia of the first peak intensity Ib to the second peak intensity Ia is in the range of 0.5 to 1.5.

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Anjo, Japan

Katsuhiro Hanaki