Coating based on NiAl
View Patent ↗The invention relates to a coating that comprises at least one compound of oxygen and/or nitrogen with at least two metal materials, said compound being present at least partly in spinel structure. The invention also relates to a method for coating and to a coated substrate.
1. A coating including at least one layer which contains two components, wherein a first component comprises oxygen and/or nitrogen with at least two metallic elements and includes NiAl 2 O 4 present at least partly in a spinel structure, and a second component comprises an x-ray amorphous phase, wherein the at least one layer exhibits droplets characteristic of a layer formed by spark evaporation.
2. The coating according to claim 1 , characterized in that an intrinsic compressive stress of the components comprising the coating is between 0.2 GPa and 5 GPa.
3. The coating according to claim 1 , characterized in that an x-ray diffraction spectrum exhibits at least two reflexes selected from the group consisting of 311, 400, and 511 reflexes.
4. The coating according to claim 1 , characterized in that the second component present in x-ray amorphous phase includes at least one of aluminum oxide and nickel oxide.
5. The coating according to claim 4 , wherein the aluminum oxide is present in at least one of corundum structure, theta phase, gamma phase, and kappa phase.
6. The coating according to claim 5 , wherein the aluminum oxide comprises crystallites with sizes around 5 nm or smaller.
7. The coating according to claim 1 , characterized in that the coating is formed from a plurality of superimposed layers, wherein the superimposed layers have identical metallic chemical elements but different metallic ratios.
8. The coating according to claim 7 , characterized in that the superimposed layers have identical chemical elements.
9. A method for coating substrates by means of arc evaporation, characterized in that an alloy target containing aluminum as one component is used for production of a coating according to claim 8 .
10. The method for coating substrates by means of arc evaporation according to claim 9 , characterized in that an Al/Ni ratio can be varied by means of oxygen flow during the formation of the coating.
11. The method for coating substrates by means of arc evaporation according to claim 10 , wherein the oxygen flow is between 300 sccm and 800 sccm.
12. The coating according to claim 1 , characterized in that a cubic support layer is included.
13. The coating according to claim 12 , wherein the cubic support layer is selected from group consisting of Al—Ti—N, Ti—C—N, Ti—N, Cr—N, and their mixtures.
14. A coated substrate, wherein in the coating is formed according to claim 13 , and the coated substrate is a cutting insert.
15. The coating according to claim 1 , wherein the droplets comprise a metallic material.
16. The coating according to claim 15 , wherein a portion of the metallic material comprises less than 50 at. % nickel.
17. The coating according to claim 1 , wherein the droplets comprise conglomerates of incompletely oxidized or incompletely nitrified metallic components or intermetallic components.
18. A coated substrate, wherein the coating is formed according to claim 1 , and a surface of the substrate onto which the coating comes to be applied is a steel.
19. The coated substrate according to claim 18 , characterized in that the steel contains Cr.
20. The coated substrate according to claim 18 , characterized in that the steel is a high speed steel.