Abstract: A metal cutting insert has a substrate body of cemented carbide, cermet, or ceramic and at least one cutting edge defined between a rake face and a relief face. The cutting insert has a CVD coating including a layer of aluminum titanium nitride having a cubic face centered lattice structure, represented by a formula (AlxTi1-xMy)CzN1-z wherein a stoichiometry coefficient of aluminum is 0.30<x<0.95, wherein M is at least one element selected from the group consisting of Cl and Ar, with a stoichiometry coefficient of which is 0?y<0.01, and wherein a stoichiometry coefficient of carbon is 0?z<0.3. The (AlxTi1-xMy)CzN1-z layer satisfies a relationship 10<|S1-S2|<500 MPa wherein S1 is the residual stress measured on the rake face, and S2 is the residual stress measured on the relief face.

Abstract: A coated cutting tool has a substrate and a coating. The coating includes at least one multi-nano-layer having a nano-composite nano-layer formed of crystalline (TixAlyCrz)N and amorphous Si3N4, wherein 0.25?x?0.75, 0.25?y?0.75, 0.05?z?0.2, 0.85?x+y+z?0.97. The atomic ratio of silicon is 1?x?y?z and 1?x?z<0.75 and the thickness of the nano-composite nano-layer is from 1 nm to 100 nm.

Abstract: A coated cutting tool has a substrate and a coating. The coating includes at least one multi-nano-layer having a nano-composite nano-layer formed of crystalline (TixAlyCrz)N and amorphous Si3N4, wherein 0.25?x?0.75, 0.25?y?0.75, 0.05?z?0.2, 0.85?x+y+z?0.97. The atomic ratio of silicon is 1?x?y?z and 1?x?z<0.75 and the thickness of the nano-composite nano-layer is from 1 nm to 100 nm.

Abstract: A cutting tool insert has a multilayer ceramic coating. The multilayer ceramic coating is a stratified structure of alternating sub layers of an oxide material and interfacial layers of a second material having good adhesion with the oxide material. The ceramic coating is deposited by chemical vapor deposition; each subsequently deposited interfacial layer serving to terminate a previously deposited oxide material sub layer and to serve as a surface for deposition of a subsequent oxide material sub layer. The second material is a solid solution of at least one element of the oxide material in a hard material.

Abstract: A cutting tool insert has a multilayer ceramic coating. The multilayer ceramic coating is a stratified structure of alternating sub layers of an oxide material and interfacial layers of a second material having good adhesion with the oxide material. The ceramic coating is deposited by chemical vapor deposition; each subsequently deposited interfacial layer serving to terminate a previously deposited oxide material sub layer and to serve as a surface for deposition of a subsequent oxide material sub layer. The second material is a solid solution of at least one element of the oxide material in a hard material.