Importance

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Abstract

A cermet has a first hard phase of a complex carbonitride solid solution, a second hard phase of WC, and a binder phase mainly comprising Co and Ni as main component(s). The first hard phase has a core/rim structure. The core is represented by (Ti_1-x-yL_xMo_y)(C_1-zN_z) and the rim is represented by (Ti_1-a-b-dR_aMo_bW_d)(C_1-eN_e), wherein L and R each represent at least one element selected from the group consisting of Zr, Hf, Nb and Ta. If a maximum thickness of the rim of the core/rim structure grains of the first hard phase is given by r_max, and a minimum thickness of the rim of the core/rim structure grains of the first hard phase is given by r_min, a number of the core/rim structure grains of the first hard phase satisfying 0.2<(r_min/r_max)<1 is 85% or more, based on the total number of the core/rim structure grains of the first hard phase.

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First Claim