| 摘要 |
The present invention relates to a coated cutting tool for metal machining with a from about 2.0 to about 20 mum thick PVD coating, having both the wear resistance of a coating of homogeneous layers and the toughness of a multilayer coating, comprising a first (Me<SUB>c1</SUB>,Me<SUB>c2</SUB>)(C,N,O) layer where Me<SUB>c1 </SUB>is one or more of the elements in the transition metal group IV-VI, Al and Si and Me<SUB>c2 </SUB>is one of the elements in the transition metal group IV-VI from about 1.0 to about 4.5 mum thick, a second (Me<SUB>d1</SUB>,Me<SUB>d2</SUB>)(C,N) layer where Me<SUB>d1 </SUB>is one or more of the elements in the transition metal group IV-VI, Al and Si and Me<SUB>e2 </SUB>is one of the elements in the transition metal group IV-VI and Y, from about 0.5 to about 4.5 mum thick, and in between the first and the second layer, an (Me<SUB>e1</SUB>, Me<SUB>e2</SUB>)(C,N,O) layer where Me<SUB>e1 </SUB>is one or more of the elements in the transition metal group IV-VI, Al and Si and Me<SUB>e2 </SUB>is one of the elements in the transition metal group IV-VI and Y, from about 0.1 to about 1.0 mum thick, where the thickness of the in between layer is less than about 0.5 times the thickness of thinnest of the first and the second layer and the layers in between has a composition differing from the first and the second layer, and a method of making thereof.
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