Coated tool part and coating method

A tool for machining a workpiece, wherein the tool includes a coated tool part, the coated tool part comprising:

• a substrate;
• a wear layer;
• and
• a bonding layer,
• wherein the substrate is coated with the wear layer and the bonding layer,
• wherein the bonding layer is disposed between the substrate and the wear layer,
• wherein the wear layer and the bonding layer each comprises a plurality of sub-layers arranged one on top of another,
• each of the plurality of sub-layers comprises a first individual ply, a second individual ply, and a third individual ply, wherein the three individual plies in the plurality of sub-layers are arranged one on top of another in a regularly alternating sequence,
• wherein the first individual ply comprises Alx1Me1-x1(Ny1C1-y1), the second individual ply comprises Alx2Me1-x2(Ny2C1-y2), and the third individual ply comprises Alx3Me1-x3-z3Siz3(Ny3C1-y3), where 0≤x1≤0.55 and x1<x2, x1<x3 and 0≤y1, y2, y3≤1, and where Me includes at least one of the following elements:
• Sc, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W,
• wherein a ply thickness of the third individual plies included in the bonding layer varies from sub-layer to sub-layer in such a way that the ply thickness of the third individual ply in a first one of the plurality of sub-layers is smaller than the ply thickness of the third individual ply in a second one of the plurality of sub-layers, the first one of the plurality of sub-layers being arranged closer to the substrate than the second one of the plurality of sub-layers, and
• wherein the ply thickness of the third individual plies included in the wear layer is constant from sub-layer to sub-layer or at least varies less from sub-layer to sub-layer than in the bonding layer.

A method, comprising:

• providing a tool part having a substrate;
• coating the substrate with a bonding layer;
• and
• coating the substrate coated with the bonding layer with a wear layer,
• wherein the coating of the substrate with the bonding layer and the coating of the substrate coated with the wear layer each comprise a deposition of a plurality of sub-layers arranged one on top of another,
• wherein each of the plurality of sub-layers comprises a first individual ply, a second individual ply, and a third individual ply, wherein the three individual plies in the plurality of sub-layers are arranged one on top of another in a regularly alternating sequence,
• wherein the first individual ply comprises Alx1Me1-x1(Ny1C1-y1), the second individual ply comprises Alx2Me1-x2(Ny2C1-y2), and the third individual ply comprises Alx3Me1-x3-z3Siz3(Ny3C1-y3), where 0≤x1≤0.55 and x1<x2, x1<x3 and 0≤y1, y2, y3≤1, where Me includes at least one of the following elements:
• Sc, Y, La, Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W,
• wherein a ply thickness of the third individual plies included in the bonding layer varies from sub-layer to sub-layer in such a way that the ply thickness of the third individual ply in a first one of the plurality of sub-layers is smaller than the ply thickness of the third individual ply in a second one of the plurality of sub-layers, the first one of the plurality of sub-layers being arranged closer to the substrate than the second one of the plurality of sub-layers, and
• wherein the ply thickness of the third individual plies included in the wear layer is constant from sub-layer to sub-layer or at least varies less from sub-layer to sub-layer than in the bonding layer.