| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool made of surface coated cermet having a hard coating layer, which shows excellent abrasion resistance in high-speed cutting machining. SOLUTION: This cutting tool made of surface coated cermet is formed by physically depositing hard coating layers of an aluminum oxide layer having 0.2-3μm of mean layer thickness as an upper layer and a compound nitride layer of Al, Ti and Si having 0.8-8μm of mean layer thickness to a surface of a WC group carbide alloy base body or a nitrocarbonized titanium-based cermet base body. The lower layer has the component density distribution structure where the maximum Al-containing points and minimum Al-containing points alternately repeatedly exist with the predetermined interval along the layer thickness direction, and content rate of Al and Ti between both the points continuously changes. Furthermore, the lower layer is formed of the compound nitride layer of Al, Ti and Si wherein the minimum Al-containing point and the maximum Al-contained point respectively satisfies a specified composition formula and the interval between the minimum Al-containing point and the maximum Al-containing point adjacent to each other is set at 0.01-0.1μm. COPYRIGHT: (C)2005,JPO&NCIPI
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