TITANIUM CARBONITRIDE-BASE CERMET THROW-AWAY TIP EXHIBITING EXCELLENT WEAR RESISTANCE IN HIGH-SPEED CUTTING WITH GENERATION OF HIGH HEAT

摘要

PROBLEM TO BE SOLVED: To provide a throw-away tip for high-speed cutting.;SOLUTION: The throw-away tip is formed of TiCN-base cermet having a mixing composition: 20 to 30% WC, 5 to 10% TaC/NbC, 5 to 10% Co, 5 to 10% Ni, and the rest being (Ti, Nb, Zr)CN (contained by 50 to 60%) satisfying a specified composition formula. The cermet is composed of a hard phase: 75 to 90 area% and a binding phase: the rest wherein (1) a core is (Ti, Nb, Zr) phase, the peripheral part is a first hard phase having a core structure of (Ti, Nb, Zr) or a (Ti, Nb, Zr, W, Ta)CN phase, (2) both of the core and the peripheral part are second hard phases each having a core structure of a (Ti, Nb, Zr, W)CN phase or a (Ti, Nb, Zr, W, Ta)CN phase, and the binding phase has a composition: 18 to 33% Co, 20 to 35% Ni, 5% or less in total Ti, Nb, Ti, Nb and Ta, and the rest being W (W is contained by 40 to 60%).;COPYRIGHT: (C)2007,JPO&INPIT