Surface-coated cutting tool
AssigneeMitsubishi Materials Corporation
InventorHidetoshi Asanuma
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Abstract
A surface coated cutting tool comprising a substrate and a coating layer on the substrate, the substrate comprising a WC-based cemented carbide comprising a hard phase component of WC grains and a binder phase primarily composed of Co, wherein (a) an interfacial layer is disposed between the substrate and the coating layer; (b) the interfacial layer includes a region A directly above the hard phase component and a region B directly above the binder phase, and the interfacial layer has an average thickness; at the midpoint across the average thickness of the interfacial layer, the W content in the region A ranges from 90 to 99 mass %, while the W content in the region B ranges from 30 to 65 mass %, the C content CA in the region A satisfies CA≤0.05 mass %, and the C content CB in the region B satisfies CA≤CB≤0.09 mass %.
Claims2
A surface coated cutting tool comprising a substrate and a coating layer on the substrate, the substrate comprising a WC-based cemented carbide comprising a hard phase component of WC grains and a binder phase primarily composed of Co, wherein
- (a) an interfacial layer is disposed between the substrate and the coating layer;
- (b) the interfacial layer includes a region A that has a W content WA and a C content CA directly above the hard phase component and a region B that has a W content WB and a C content CB directly above the binder phase, and the interfacial layer has an average thickness;
- at the one-half point of the average thickness of the interfacial layer, the W content WA in the region A is in the range of 90 to 99 mass % and the C content is CA, while the W content WB in the region B is in the range of 30 to 65 mass % and the C content is CB,
- the C content CA in the region A satisfies the expression:
- CA≤0.05 mass %, and
- the C content CB in the region B satisfies the expression:
- CA≤CB≤0.09 mass %.
Dependencies are inferred from the claim text.