The surface coating thermet make cutting tool null tungsten carbide basis which shows the resistance chipping characteristic where thick film conversion type

摘要

PROBLEM TO BE SOLVED: To provide a cutting tool made of surface-coated cermet, having a thick α-type Al₂O₃ layer achieving excellent anti-chipping performance.;SOLUTION: This cutting tool of surface-coated cermet comprises a tool base body composed of WC-based cemented carbide or TiCN-based cermet, coated with a hard coating layer composed of (a) a lower layer of a Ti compound layer comprising one layer or more than 2 layers of TiC layer, TiN layer, TiCN layer, TiCO layer, and TiCNO layer formed by chemical vapor deposition, and having a total average layer thickness of 0.5-10μm, and (b) an upper layer of a thick reformed α-type Al₂O₃ layer having an α-type crystal structure in a chemically vapor-deposited state, showing a specific inclined angle numerical distribution graph, and having an average layer thickness of 16-30μm.;COPYRIGHT: (C)2007,JPO&INPIT