Patent ID: 8859114

Claim:
A coated cutting tool comprising: a substrate; and a coating adhered to the substrate, the coating comprising: an inner layer deposited by physical vapor deposition comprising aluminum, one or more metallic elements selected from the group consisting of 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 nitrogen and non-metallic elements of Groups IIIA, IVA and VIA of the Periodic Table; and an outer layer deposited by physical vapor deposition over the inner layer, the outer layer comprising aluminum and silicon and one or more metallic elements selected from the group consisting of 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 nitrogen and non-metallic elements of Groups IIIA, IVA and VIA of the Periodic Table, wherein the amount of silicon in the outer layer decreases toward the inner layer.