CVD coated cutting tools are provided. A coated cutting tool described herein, in some embodiments, comprises a PcBN substrate and a polished coating adhered to the substrate including one or more layers of Al2O3 deposited by chemical vapor deposition, wherein the coating has a surface roughness (Ra
CVD coated cutting tools are provided. A coated cutting tool described herein, in some embodiments, comprises a PcBN substrate and a polished coating adhered to the substrate including one or more layers of Al2O3 deposited by chemical vapor deposition, wherein the coating has a surface roughness (Ra) less than about 600 nm in an area of the cutting tool for contacting a workpiece.
대표청구항▼
1. A coated cutting tool comprising: a polycrystalline cubic boron nitride (PcBN) substrate comprising greater than 85 weight percent PcBN; anda polished coating adhered to the substrate comprising first and second layers of Al2O3 deposited by chemical vapor deposition, wherein the first Al2O3 layer
1. A coated cutting tool comprising: a polycrystalline cubic boron nitride (PcBN) substrate comprising greater than 85 weight percent PcBN; anda polished coating adhered to the substrate comprising first and second layers of Al2O3 deposited by chemical vapor deposition, wherein the first Al2O3 layer of the coating is deposited directly on the PcBN substrate and the second Al2O3 layer is deposited on TiN, TiC or TiCN layer and wherein the coating has a surface roughness (Ra) less than about 600 nm in an area of the cutting tool for contacting a workpiece. 2. The coated cutting tool of claim 1, wherein the surface roughness (Ra) is less than about 250 nm. 3. The coated cutting tool of claim 1, wherein the surface roughness (Ra) ranges from about 25 nm to less than 200 nm. 4. The coated cutting tool of claim 1, wherein the first Al2O3 layer has thickness less than about 1 μm and the second Al2O3 layer has thickness greater than about 3 μm. 5. The coated cutting tool of claim 1 further comprising an outer layer deposited over the one or more Al2O3 layers, the outer layer comprising one or more metallic elements selected from the group consisting of aluminum and metallic elements of Groups IVB, VB and VIB of the Periodic Table and one or more non-metallic elements selected from the group consisting of non-metallic elements of Groups IIIA, IVA, VA and VIA of the Periodic Table. 6. The coated cutting tool of claim 5, wherein the outer layer is TiN, TiCN or a combination of TiN and TiCN layers. 7. The coated cutting tool of claim 1, wherein the one or more Al2O3 layers are α-Al2O3. 8. The coated cutting tool of claim 1, wherein the coating is polished in an area of the cutting tool for contacting a workpiece. 9. The coated cutting tool of claim 1, wherein the coating comprises the structure of Al2O3—TiN-medium temperature TiCN—TiCN—Al2O3—TiN. 10. A coated cutting tool comprising: a polycrystalline cubic boron nitride substrate; anda polished coating adhered to the substrate comprising a first Al2O3 layer deposited directly on the PcBN substrate and a second Al2O3 layer deposited on a layer of TiN, TiC or TiCN, wherein the coating has a surface roughness (Ra) less than about 600 nm in an area of the cutting tool for contacting a workpiece. 11. The coated cutting tool of claim 10, wherein the surface roughness (Ra) ranges from greater than 200 nm to about 600 nm. 12. The coated cutting tool of claim 10, wherein the surface roughness (Ra) is less than about 250 nm. 13. The coated cutting tool of claim 10, wherein the first Al2O3 layer has thickness less than about 1 μm and the second Al2O3 layer has thickness greater than about 3 μm. 14. The coated cutting tool of claim 10, wherein the substrate comprises at least 90 weight percent PcBN. 15. The coated cutting tool of claim 10, wherein the first Al2O3 layer is α-Al2O3. 16. The coated cutting tool of claim 10, wherein the coating comprises the structure of Al2O3—TiN-medium temperature TiCN—TiCN—Al2O3—TiN. 17. The coated cutting tool of claim 10, wherein the polycrystalline cubic boron nitride substrate is brazed to a support. 18. A coated cutting tool comprising: a polycrystalline cubic boron nitride (PcBN) substrate comprising greater than 85 weight percent PcBN; anda polished coating adhered to the substrate comprising first and second layers of Al2O3 deposited by chemical vapor deposition, wherein the first Al2O3 layer of the coating having thickness less than about 1 μm is deposited directly on the PcBN substrate and the second Al2O3 layer having thickness greater than about 3 μm is deposited on a layer of the coating comprising one or more metallic elements selected from the group consisting of aluminum and metallic elements of Groups IVB, VB and VIB of the Periodic Table and one or more non-metallic elements selected from the group consisting of non-metallic elements of Groups IIIA, IVA, VA and VIA of the Periodic Table, wherein the coating has a surface roughness (Ra) less than about 600 nm in an area of the cutting tool for contacting a workpiece. 19. The coated cutting tool of claim 18, wherein the surface roughness (Ra) ranges from about 25 nm to about 150 nm. 20. The coated cutting tool of claim 18 further comprising an outer layer deposited over the one or more Al2O3 layers, the outer layer comprising one or more metallic elements selected from the group consisting of aluminum and metallic elements of Groups IVB, VB and VIB of the Periodic Table and one or more non-metallic elements selected from the group consisting of non-metallic elements of Groups IIIA, IVA, VA and VIA of the Periodic Table. 21. The coated cutting tool of claim 18, wherein the second Al2O3 layer is deposited on a layer to TiN, TiC, TiCN, TiOCN, TiAlOCN or a mixture to TiOCN and TiAlOCN. 22. The coated cutting tool of claim 18, wherein the substrate comprises at least 90 weight percent PcBN. 23. The coated cutting tool of claim 18, wherein the first Al2O3 layer is α-Al2O3. 24. The coated cutting tool of claim 18, wherein the coating comprises the structure of Al2O3—TiN-medium temperature TiCN—TiCN—Al2O3—TiN. 25. A coated cutting tool comprising: a polycrystalline cubic boron nitride substrate; anda polished coating adhered to the substrate comprising a first Al2O3 layer having thickness less than about 1 μm deposited directly on the PcBN substrate and a second Al2O3 layer having thickness greater than about 3 μm deposited on a layer of the coating comprising one or more metallic elements selected from the group consisting of aluminum and metallic elements of Groups IVB, VB and VIB of the Periodic Table and one or more non-metallic elements selected from the group consisting of non-metallic elements of Groups IIIA, IVA, VA and VIA of the Periodic Table, wherein the coating has a surface roughness (Ra) less than about 600 nm in an area of the cutting tool for contacting a workpiece. 26. The coated cutting tool of claim 25, wherein the surface roughness (Ra) ranges from about 25 nm to about 150 nm. 27. The coated cutting tool of claim 25 further comprising an outer layer deposited over the one or more Al2O3 layers, the outer layer comprising one or more metallic elements selected from the group consisting of aluminum and metallic elements of Groups IVB, VB and VIB of the Periodic Table and one or more non-metallic elements selected from the group consisting of non-metallic elements of Groups IIIA, IVA, VA and VIA of the Periodic Table. 28. The coated cutting tool of claim 25, wherein the second Al2O3 layer is deposited on a layer to TiN, TiC, TiCN, TiOCN, TiAlOCN or a mixture to TiOCN and TiAlOCN. 29. The coated cutting tool of claim 25, wherein the substrate comprises at least 90 weight percent PcBN. 30. The coated cutting tool of claim 25, wherein the first Al2O3 layer is α-Al2O3. 31. The coated cutting tool of claim 25, wherein the coating comprises the structure of Al2O3—TiN-medium temperature TiCN—TiCN—Al2O3—TiN. 32. The coated cutting tool of claim 25, wherein the coating is polished in the area of the cutting tool for contacting a workpiece. 33. The coated cutting tool of claim 25, wherein the polycrystalline cubic boron nitride substrate is brazed to a support.
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