| 主权项 |
1. A composite part comprising:
a cutting edge part made of cubic boron nitride sintered material or WC-based cemented carbide and containing a cutting edge; a cutting tool body made of WC-based cemented carbide; and a bonding part provided between the cutting edge part and the cutting tool body and bonding the cutting edge part and the cutting tool body, wherein (a) a primarily TiC layer containing 50 area % or more of TiC is formed in an interface between the cemented carbide and the bonding part on a side of the bonding part, the primarily TiC layer having an average layer thickness of 0.5 μm to 3 μm; and a Ti—Ni enriched layer containing each of Ti and Ni at 30 atomic % or more is formed adjacent to the primarily TiC layer, the Ti—Ni enriched layer having an average layer thickness of 0.3 μm to 3 μm, and (b) an intermittent net structure containing each of Ti, Ni and C at 10 atomic % or more is formed adjacent to the primarily TiC layer on a side of the bonding part, the intermittent net structure having an average width of 10 nm to 200 nm, and a straight line overlapping with a major axis of each of crystal grains containing each of Ti, Ni, and C at 10 atomic % or more intersecting, on average, 3 or more other crystal grains containing each of Ti, Ni, and C at 10 atomic % or more. |
