Importance

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Abstract

A cermet has a WC first hard phase, a second hard phase including one or more of a carbide, nitride and carbonitride of an element(s) of groups 4, 5 and 6 of the Periodic Table including a titanium element, and a mutual solid solution thereof, and a binder phase. In the cermet, a carbon amount C_T (% by weight), a tungsten amount C_W (% by weight), and a nitrogen amount C_N (% by weight) satisfy 0.25<(C_N/(C_T−0.0653·C_W))<6. The cermet has a surface region with a thickness of 5 to 100 μm which includes the first hard phase and the binder phase, and an inner region which includes the first and second hard phases and the binder phase. In a cross-section of the inner region, a ratio of an area of the first hard phase to an area of the second hard phase is 0.15 to 4.

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First Claim