Coated cutting tool
AssigneeAB Sandvik Coromant
InventorsJan Engqvist, Erik Lindahl
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Abstract
A coated cutting tool having a substrate and a coating is provided. The coating includes an inner α-Al2O3-multilayer and an outer α-Al2O3-single-layer. The thickness of the inner α-Al2O3-multilayer is less than or equal to 35% of the sum of the thickness of the inner α-Al2O3-multilayer and the thickness of the outer α-Al2O3-single-layer. The sum of the thickness of the inner α-Al2O3-multilayer and the outer α-Al2O3-single-layer is 2-15 μm. The inner α-Al2O3-multilayer consists of alternating sublayers of α-Al2O3 and sublayers of TiCO, TiCNO, AlTiCO or AlTiCNO. The inner α-Al2O3-multilayer can include at least 5 sublayers of α-Al2O3.
Claims14
A coated cutting tool comprising:
- a substrate;
- and
- a coating, the coating including
- an inner α-Al2O3-multilayer and an outer α-Al2O3-single-layer,
- wherein a thickness of the outer α-Al2O3-single-layer is 1-10 μm,
- wherein a thickness of the inner α-Al2O3-multilayer is less than or equal to 35% of a sum of the thickness of the inner α-Al2O3-multilayer and the thickness of the outer α-Al2O3-single-layer,
- wherein the inner α-Al2O3-multilayer consists of alternating sublayers of α-Al2O3and sublayers of TiCO, TiCNO, AlTiCO or AlTiCNO, the inner α-Al2O3-multilayer including at least 5 sublayers of α-Al2O3, and
- wherein the thickness of the inner α-Al2O3-multilayer is 12% to 35% of the sum of the thickness of the inner α-Al2O3-multilayer and the thickness of the outer α-Al2O3-single-layer.
Dependencies are inferred from the claim text.