Carbide Tool Binder Phase

When the content of the binder phase in the cemented carbide tool is 5 to 7 mass %, the mean particle size of the hard phase is 0.6 μm to 1.0 μm, saturation magnetization is 9 to 12 μTm3/kg, the coercive force Hc is 15 to 25 kA/m, and the oxygen content is 0.045 mass % or less. Consequently, the resulting cemented carbide has high hardness and high toughness.



When the cemented carbide is used in a cutting tool, the resulting tool is excellent in wear resistance and fracture resistance. Because of low content of the binder phase, a work material made of a Ti alloy or a heat resistant alloy is less likely to be welded and thus it is possible to prevent chipping of the cutting edge due to welding and a become rough in surface roughness of the worked surface.


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