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1. (WO2019043095) A COATED CUTTING TOOL AND A METHOD FOR COATING THE CUTTING TOOL
Anmerkung: Text basiert auf automatischer optischer Zeichenerkennung (OCR). Verwenden Sie bitte aus rechtlichen Gründen die PDF-Version.

Claims

1. A coated cutting tool comprising a substrate with a coating having a total thickness of 0.25- 30 μηι, wherein the coating comprises a first layer and a second layer, and where the first layer is a wear resistant PVD deposited layer having a thickness of 0.2-15 μηι, preferably 0.2-10 μηι, most preferably 0.5-5 μηι, and the first layer is arranged between the substrate and the second layer, c h a r a c t e r i z e d in that the second layer is a Cr layer and that the Cr layer is an outermost layer of the coating.

2. The coated cutting tool according to any of the preceding claims, wherein the thickness of the Cr layer is 0.05-5 μηι, preferably 0.05-3 μηι.

3. The coated cutting tool insert according any of the preceding claims, wherein the Cr layer is a PVD deposited layer.

4. The coated cutting tool according to any of the preceding claims, wherein the Cr layer has a body-centered cubic structure with a crystallographic orientation relation of 0.3 < Rl < 1, where Rl = Ι(ΐ ιο)/(Ι(ΐ ιο)+Ι (2θθ)+Ι(2ΐ ΐ)), and where I(i io), I(200), and I(2i i) are the XRD peak areas as extracted from the pseudo-Voigt peak profile fitting results of Θ-2Θ scans obtained with CuKa radiation for the bcc structure (110), (200), and (211) Cr layer diffraction peaks, respectively.

5. The coated cutting tool according to any of the preceding claims, wherein the first layer is a (Tii-xAlx)Ny layer with 0.1 < x <0.7 and 0.6 < y < 1.1.

6. The coated cutting tool according to any of the preceding claims, wherein the first layer is a NaCl structure c-(Tii-xAlx)Ny layer, where 0.1 < x < 0.7, and 0.7 < y < 1.1.

7. The coated cutting tool according to claim 5 or 6, wherein 0.5 < x < 0.6.

8. The coated cutting tool according to any of claims 1-4, wherein the first layer is a NaCl structured (Tii-vAlv)Nw / (Tii-aSia)Nb nanolaminate with sublayer thickness between 5 and

50 nm, where O.K v < 0.7, preferably 0.4 < v < 0.7, 0.7 < w < 1.1, 0.02 < a < 0.25, preferably 0.05 < a < 0.15, and 0.7 < b < 1.1.

9. The coated cutting tool according to any of claims 1-4, wherein the first layer is a

(Tii-mSim)Nn layer, where 0 < m < 0.25, preferably 0 < m < 0.15, and 0.7 < n < 1.1.

10. The coated cutting tool according to any of claims 1-4, wherein the first layer is a

(Cn-cAlc)Nd layer, where 0.5 < c < 0.9, preferably 0.5 < c < 0.8, and 0.7 < d < 1.1.

1 1. The coated cutting tool according to any of claims 1-4, wherein the first layer is a

(Cn-eAle)203 layer, where 0.5 < e < 0.9, preferably 0.5 < e < 0.8.

12. The coated cutting tool according to any of the preceding claims, wherein the ratio

between the Cr layer thickness and the total coating thickness is between 0.01 and 2, preferably between 0.01 and 1 , most preferably between 0.05 and 0.5.

13. The coated cutting tool according to any of the preceding claims, wherein the first layer has a hardness H > 20 GPa, preferably H > 24 GPa.

14. The coated cutting tool according to any of claims 1-10 or any of claims 12-13, wherein the first layer has a NaCl type structure and the Cr layer has a body-centered cubic structure, the ratio, R4, between the XRD peak intensity of the (1 10) body-centered cubic Cr peak and the XRD peak intensity of the (200) NaCl structure peak originating from the first layer is 0.05 < R4 < 30, where XRD peak intensity is evaluated as the peak area extracted from the pseudo-Voigt peak profile fitting results of Θ-2Θ scans obtained with CuKa radiation.

15. The coated cutting tool according to any of the preceding claims, wherein the substrate comprises at least one of the following: cemented carbide, cermet, ceramics, steel and cubic boron nitride.

16. The coated cutting tool according to claim 15, wherein the cemented carbide comprising WC and 4-15 wt% Co.

17. A method for producing of a coated cutting tool comprising the steps of

- applying a substrate of cemented carbide, cermet, ceramic, steel or cubic boron nitride with a hard and wear resistant coating having a thickness of 0.25-30 μηι by means of PVD (physical vapor deposition) techniques, preferably cathodic arc deposition, wherein the coating comprises a first layer and a second layer, the second layer being a Cr layer arranged as an outermost layer of the coating,

- growing the Cr layer by using pure Cr cathodes applying an evaporation current between 50 A and 200 A, a gas atmosphere containing pure Ar at a total gas pressure between 1.0 Pa and 7.0 Pa, preferably between 2.0 Pa and 5.0 Pa, and applying a deposition temperature between room temperature and 500 °C.

18. The method according to claim 17 comprising growing a first layer being a (Tii-xAlx)Ny- layer, with 0.1 < x < 0.7 and 0.7 < y < 1.1, between the substrate and the Cr layer, by cathodic arc evaporation with an evaporation current between 50 A and 200 A using composite and/or alloyed (Ti,Al) cathodes, and in a reactive gas atmosphere containing 2 and optionally mixed with Ar, at a total gas pressure between 1.0 Pa and 7.0 Pa, preferably between 2.5 Pa and 5 Pa, with a negative substrate bias between 0 V and 300 V, preferably between 20 V and 150 V, more preferably between 30 V and 100 V at a temperature between 200 °C and 800 °C, preferably between 300 °C and 600 °C.