Cemented carbide Tool Binder Phase Riched Layer

Cemented carbide tool comprising a binder phase riched layer having a thickness of 0.1 to 5 μm on the surface, and also satisfies the following relationship: 0.02≦ICo/(IWC+ICo)≦0.5 where IWC denotes a (001) plane peak intensity of the tungsten carbide (WC), and ICo denotes a (111) plane peak intensity of cobalt (Co) and/or nickel (Ni) in an X-ray diffraction pattern of the surface.

The resulting cemented carbide tool is excellent in flexural strength and, when the cemented carbide is used for cutting tool, even under conventional cutting conditions where a special device such as coolant under high pressure is not used in case of machining a heat resistant alloy such as Ti alloy, proceeding of wear and occurrence of chipping can be suppressed and tool life can be prolonged. when a cemented carbide is produced by adjusting the content of a binder phase so as to controlling saturation magnetization to 1.62 μTm3/kg or less per 1 weight % of cobalt (Co) and a coercive force to 27.8 to 51.7 kA/m while suppressing segregation of a Co component, fractures in the cemented carbide decrease to impart high deflective strength, and thus a cutting tool suited for drilling or milling can be obtained.


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