In one aspect, cutting tools are described having coatings adhered thereto which, in some embodiments, demonstrate desirable wear resistance and increased cutting lifetimes. A coated cutting tool described herein comprises a substrate and a coating adhered to the substrate, the coating including a r
In one aspect, cutting tools are described having coatings adhered thereto which, in some embodiments, demonstrate desirable wear resistance and increased cutting lifetimes. A coated cutting tool described herein comprises a substrate and a coating adhered to the substrate, the coating including a refractory layer comprising plurality of sublayer groups, a sublayer group comprising an aluminum oxynitride (AlON) sublayer or a composite AlON sublayer and an alumina (Al2O3) sublayer or composite alumina sublayer.
대표청구항▼
1. A coated cutting tool comprising: a substrate; anda coating adhered to the substrate, the coating including a refractory layer comprising a plurality of sublayer groups, a sublayer group comprising an aluminum oxynitride sublayer or a composite aluminum oxynitride sublayer and an alumina sublayer
1. A coated cutting tool comprising: a substrate; anda coating adhered to the substrate, the coating including a refractory layer comprising a plurality of sublayer groups, a sublayer group comprising an aluminum oxynitride sublayer or a composite aluminum oxynitride sublayer and an alumina sublayer or composite alumina sublayer. 2. The coated cutting tool of claim 1, wherein the composite aluminum oxynitride sublayer comprises an aluminum oxynitride phase and a metal oxide phase comprising one or more oxides of metallic elements of Group IVB of the Periodic Table. 3. The coated cutting tool of claim 2, wherein the metal oxide phase comprises ZrO2, HfO2 or mixtures thereof. 4. The coated cutting tool of claim 2, wherein the composite aluminum oxynitride sublayer further comprises a metal oxynitride phase in addition to the aluminum oxynitride phase and metal oxide phase, the metal oxynitride phase comprising at least one oxynitride of a metallic element selected from Group IVB of the Periodic Table. 5. The coated cutting tool of claim 4, wherein the metal oxynitride phase is TiON. 6. The coated cutting tool of claim 1, wherein the composite alumina sublayer comprises an alumina phase and a metal oxide phase comprising one or more oxides of metallic elements of Group IVB of the Periodic Table. 7. The coated cutting tool of claim 6, wherein the metal oxide phase is formed of zirconia, hafnia or mixtures thereof. 8. The coated cutting tool of claim 7, wherein the metal oxide phase further comprises titanium oxide. 9. The coated cutting tool of claim 1, wherein the composite alumina layer is formed of alumina doped with one or more metallic elements selected from Group IVB of the Periodic Table. 10. The coated cutting tool of claim 9, wherein the alumina is doped with zirconium, titanium or mixtures thereof in an amount of 0.01-5 wt. % of the composite alumina sublayer. 11. The coated cutting tool of claim 1, wherein the sublayer groups are adjacent to one another. 12. The coated cutting tool of claim 1, wherein the refractory layer comprises at least four sublayer groups. 13. The coated cutting tool of claim 1, wherein at least one sublayer group is formed of the aluminum oxynitride sublayer and composite alumina sublayer. 14. The coated cutting tool of claim 1, wherein at least one sublayer group is formed of the aluminum oxynitride sublayer and alumina sublayer. 15. The coated cutting tool of claim 1, wherein a first sublayer group comprises an aluminum oxynitride sublayer or a composite aluminum oxynitride sublayer and a composite alumina sublayer and a second sublayer group comprises a composite aluminum oxynitride sublayer and an alumina sublayer. 16. The coated cutting tool of claim 1, wherein the aluminum oxynitride sublayer, composite aluminum oxynitride sublayer, alumina sublayer and composite alumina sublayer each have thickness less than 1 μm. 17. The coated cutting tool of claim 1, wherein the aluminum oxynitride sublayer, composite aluminum oxynitride sublayer, alumina sublayer and composite alumina sublayer each have a thickness of 0.1 μm to 0.8 μm. 18. The coated cutting tool of claim 16, wherein the refractory layer has a thickness of 5 μm to 25 μm. 19. The coated cutting tool of claim 16, wherein the refractory layer has a thickness of 6 μm to 15 μm. 20. The coated cutting tool of claim 1, wherein the composite alumina sublayer or the alumina sublayer has a hardness (HV0.05) less than the composite aluminum oxynitride layer. 21. The coated cutting tool of claim 1 further comprising one or more inner layers between the refractory layer and the substrate. 22. The coated cutting tool of claim 21, wherein an inner layer comprises 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 of Groups IIIA, IVA, VA and VIA of the Periodic Table. 23. The coated cutting tool of claim 22, wherein the one or more inner layers are selected from the group consisting of TiN, TiCN, TiOCN, ZrCN and alumina. 24. The coated cutting tool of claim 1, wherein the substrate is cemented carbide or cermet. 25. A coated cutting tool comprising: a substrate; anda coating adhered to the substrate, the coating including a refractory layer comprising a plurality of sublayer groups, a sublayer group comprising a composite aluminum oxynitride sublayer and an alumina sublayer or composite alumina sublayer. 26. The coated cutting tool of claim 25, wherein the composite aluminum oxynitride sublayer comprises an aluminum oxynitride phase and a metal oxide phase comprising one or more oxides of metallic elements of Group IVB of the Periodic Table. 27. The coated cutting tool of claim 26, wherein the metal oxide phase comprises ZrO2, HfO2 or mixtures thereof. 28. The coated cutting tool of claim 26, wherein the composite aluminum oxynitride sublayer further comprises a metal oxynitride phase in addition to the aluminum oxynitride phase and metal oxide phase, the metal oxynitride phase comprising at least one oxynitride of a metallic element selected from Group IVB of the Periodic Table. 29. The coated cutting tool of claim 28, wherein the metal oxynitride phase is TiON. 30. The coated cutting tool of claim 25, wherein the sublayer group comprises the composite alumina sublayer. 31. The coated cutting tool of claim 30, wherein the composite alumina sublayer comprises an alumina phase and a metal oxide phase comprising one or more oxides of metallic elements of Group IVB of the Periodic Table. 32. The coated cutting tool of claim 31, wherein the metal oxide phase is formed of zirconia, hafnia or mixtures thereof. 33. The coated cutting tool of claim 32, wherein the metal oxide phase further comprises titanium oxide. 34. The coated cutting tool of claim 30, wherein the composite alumina layer is formed of alumina doped with one or more metallic elements selected from Group IVB of the Periodic Table. 35. The coated cutting tool of claim 34, wherein the alumina is doped with zirconium, titanium or mixtures thereof in an amount of 0.01-5 wt. % of the composite alumina sublayer. 36. A coated cutting tool comprising: a substrate; anda coating adhered to the substrate, the coating including a refractory layer comprising a plurality of sublayer groups, a sublayer group comprising an aluminum oxynitride sublayer or a composite aluminum oxynitride sublayer and a composite alumina sublayer. 37. The coated cutting tool of claim 36, wherein the composite alumina sublayer comprises an alumina phase and a metal oxide phase comprising one or more oxides of metallic elements of Group IVB of the Periodic Table. 38. The coated cutting tool of claim 37, wherein the metal oxide phase is formed of zirconia, hafnia or mixtures thereof. 39. The coated cutting tool of claim 38, wherein the metal oxide phase further comprises titanium oxide. 40. The coated cutting tool of claim 36, wherein the composite alumina layer is formed of alumina doped with one or more metallic elements selected from Group IVB of the Periodic Table. 41. The coated cutting tool of claim 40, wherein the alumina is doped with zirconium, titanium or mixtures thereof in an amount of 0.01-5 wt. % of the composite alumina sublayer.
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