Cutting insert having ceramic coating
AssigneeIscar, Ltd.
InventorsMarcel Elkouby, Gadi Greenman
Life of this patent
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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.
Claims25
A coated cutting insert comprising a substrate and a CVD-deposited multilayer ceramic coating formed over the substrate, the multilayer ceramic coating comprising:
- alternating layers of α-Al2O3 and an interfacial layer;
- wherein:
- the α-Al2O3 layers and the interfacial layers adhere to one another, with opposite sides of at least one interfacial layer adhering to different α-Al2O3 layers;
- and
- the interfacial layer is a solid solution of oxygen and aluminum in a matrix of TiCN, TiC or TiN.
A method of forming a CVD-deposited multilayer ceramic coating over a cutting insert having a substrate, the method comprising:
- depositing, over said substrate, alternating layers of α-Al2O3 and an interfacial layer such that the α-Al2O3 layers and the interfacial layers adhere to one another, with opposite sides of at least one interfacial layer adhering to different α-Al2O3 layers;
- wherein the interfacial layer is a solid solution of oxygen and aluminum in a matrix of TiCN, TiC or TiN.
Dependencies are inferred from the claim text.