High speed the surface canning thermet make cutting tool null tungsten carbide basis which shows the resistance blade tipping Characteristic where the hard enveloping layer is superior heavily

摘要

PROBLEM TO BE SOLVED: To provide a surface coated cermet cutting tool having a hard coating layer exhibiting excellent chipping resistance in high-speed heavy cutting.;SOLUTION: The hard coating layer of the surface coated cermet cutting tool is composed of a lower layer and an upper layer, wherein (a) the lower layer is Ti compound layer which is composed of one or more layers of TiC layer, TiN layer, TiCN layer, TiCO layer and TiCNO layer each formed by chemical deposition, and a reformed TiCN layer which has an average layer thickness of 2.5 to 15 μm, satisfies a formula (Ti_1-XCr_X)C_1-YN_Y, (where X is 0.005 to 0.05, Y is 0.45 to 0.55 by atomic ratio.) and indicates a specific constituent atom sharing lattice point distribution graph, and has total average layer thickness of 3 to 20 μm, and (b) the abovementioned upper layer is Al₂O₃ layer which has an average layer thickness of 1 to 15 μm and α-type crystal structure in a state formed by chemical vapor deposition.;COPYRIGHT: (C)2007,JPO&INPIT