| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool made of TiCN base cermet, which cutting tool can show excellent chipping resistance in intermittent heavy cutting to repeatedly apply large mechanical/thermal shocks to the cutting tool. SOLUTION: The titanium carbonitride base cermet is composed of a sintered body of an average composition containing 5 to 10 mass% of Co, 5 to 10 mass% of Ni, 0.02 to 0.2 mass% of S, 20 to 30% of WC in terms of carbide, 5 to 10% of one or two kinds of TaC and NbC in terms of carbide, and the remainder of TiCN (50 to 60%). In the TiCN base cermet, a (Ti, Ta/Nb)CS phase is precipitated inside the required width within 100 to 500μm from the surface in a dendrite state, and the surface side from the required width does not have the (Ti, Ta/Nb)CS precipitated phase, and contains 0.02 mass% or less of S. COPYRIGHT: (C)2009,JPO&INPIT
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