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 the hard coating layer on the surface of a tool base body composed of WC-based cemented carbide or TiCN-based cermet. The hard coating layer is composed of (a) a primer layer of Ti compound layer comprising one layer or two more more layers, and having average layer thickness of 3-20μm, (b) an upper layer of a heat-transformed α-type Al2O3 layer having texture having a specific crystal structure as formed by chemical vapor deposition, in which heat transformation cracks are dispersed and distributed, and having average layer thickness of 1-15μm, (c) a surface layer of a Ti oxide layer formed by chemical vapor deposition, satisfying atomic ratio of 1.2-1.9 to X:Ti as measured by Auger spectrochemical analysis device at a thickness direction center part as represented by formula:TiOx, and having average layer thickness of 0.1-5μm, and (d) a TiN layer as outermost surface color discrimination layer that is formed by chemical vapor deposition, 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由以下材料制成的工具基体的表面上形成硬涂层而制成的: WC基硬质合金或TiCN基金属陶瓷。硬涂层由(a)Ti化合物层的底漆层组成,该底漆层包括一层或两层以上,并且平均层厚度为3-20μm,(b)热转化的α的上层。 ;型Al 2 Sub> O 3 Sub>层,具有通过化学气相沉积形成的具有特定晶体结构的织构,其中,热转变裂纹分散并分布,并且具有平均层厚度为1-15μm,(c)通过化学气相沉积形成的Ti氧化物层的表面层,满足由俄歇光谱化学分析装置在厚度方向中央部分测得的相对于X:Ti的原子比为1.2-1.9。由式:TiOx表示的平均层厚度为0.1-5μm,和(d)作为TiN层的最外表面颜色辨别层,其通过化学气相沉积形成,其平均层厚度为0.05-2μm。 ;版权:(C)2004,JPO&NCIPI
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