PROBLEM TO BE SOLVED: To provide a cutting tool of surface-coated cermet with a hard coating layer having excellent thermal shock resistance.;SOLUTION: This cutting tool is manufactured by forming surface coating on cemented carbide or a cermet base body. This surface coating is composed of (a) a primer layer of a Ti compound layer comprising one or a lamination of two or more layers among TiC, TiN, TiCN, TiCO, and TiCNO layers, having average thickness of 3-20μm, (b) an upper layer of an Al2O3 layer having texture having an average layer thickness of 3-15μm, with α-type crystal structure formed by applying heat-transformation treatment to Al2O3 of a κ-or θ-type crystal structure, in which cracks generated by heat transformation are dispersed and distributed, (c) a surface part layer of a Ti oxide layer having average layer thickness of 0.5-5μm, with X satisfying an atomic ratio of 1.2-1.9 as measured by an Auger spectrochemical analysis device at a thickness direction center part when represented by a formula: TiOx, and (d) an outermost surface color discrimination layer of a TiN layer having average layer thickness of 0.05-2μm.;COPYRIGHT: (C)2004,JPO&NCIPI
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机译：解决的问题：提供一种表面涂层金属陶瓷的切削工具，该切削工具具有具有优异的耐热冲击性的硬涂层。解决方案：该切削工具是通过在硬质合金或金属陶瓷基体上形成表面涂层而制成的。该表面涂层由（a）平均厚度为3-20μm的Ti化合物层的底漆层组成，该底漆层包括TiC，TiN，TiCN，TiCO和TiCNO层之间的一层或两层或多层的层压， （b）Al 2 O 3 层的上层，其具有平均层厚度为3-15μm的织构，并具有由对κ型或θ型晶体结构的Al 2 O 3 进行热变形处理，使热变形产生的裂纹分散并分散， c）当由Auger光谱化学分析装置在厚度方向中央部分表示时，平均层厚度为0.5-5μm的X氧化物层的表面部分层具有满足原子比为1.2-1.9的X。式：TiOx，和（d）平均层厚度为0.05-2μm的TiN层的最外表面颜色辨别层;版权：（C）2004，JPO＆NCIPI
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