Coated cutting tool
A coated cutting tool includes a multilayer of alternating sublayers of κ-Al 2 O 3 and sublayers of TiN, TiC, TiCN, TiCO or TiCNO. The multilayer includes at least 3 sublayers of κ-Al 2 O 3 . The multilayer further exhibits an XRD diffraction over a θ-2θ scan of 15°-140°, wherein the 0 0 2 diffraction peak (peak area) is the strongest peak originating from the κ-Al 2 O 3 sublayers of the multilayer.
1. A coated cutting tool comprising:
a substrate; and
a coating, wherein the coating comprises a multilayer consisting of alternating sublayers of κ-Al 2 O 3 and sublayers of TiN, TiC, TiCN, TiCO or TiCNO, said multilayer including at least 3 sublayers of κ-Al 2 O 3 , wherein said multilayer exhibits an XRD diffraction over a θ-2θ scan of 15°-140°, wherein the 0 0 2 diffraction peak is a strongest peak originating from the κ-Al 2 O 3 sublayers of the multilayer.
2. The coated cutting tool of claim 1 , wherein an average thickness of each TiN, TiC, TiCN, TiCO or TiCNO sublayer is 10-500 nm.
3. The coated cutting tool of claim 1 , wherein an average thickness of each κ-Al 2 O 3 sublayer is 30-900 nm.
4. The coated cutting tool of claim 1 , further comprising an α-Al 2 O 3 -layer located between the substrate and the multilayer.
5. The coated cutting tool of claim 4 , wherein a thickness of said α-Al 2 O 3 -layer is 0.1-10 μm.
6. The coated cutting tool of claim 1 , further comprising a TiCN layer located between the substrate and the multilayer.
7. The coated cutting tool of claim 6 , wherein a thickness of said TiCN layer is 2-15 μm.
8. The coated cutting tool of claim 6 , wherein the TiCN layer exhibits a texture coefficient TC(hkl), as measured by X-ray diffraction using CuKα radiation and θ-2θ scan, defined according to Harris formula, where I(hkl) is the measured intensity (peak area) of the (hkl) reflection, I 0 (hkl) is the standard intensity according to ICDD's PDF-card No. 42-1489, n is the number of reflections, reflections used in the calculation are (1 1 1), (2 0 0), (2 2 0), (3 1 1), (3 3 1), (4 2 0) and (4 2 2), wherein the TC (422)+TC(311)>3.
9. The coated cutting tool of claim 1 , wherein a thickness of said κ-Al 2 O 3 -multilayer is 1-15 μm.
10. The coated cutting tool of claim 1 , wherein a total coating thickness is 2-9 μm and said κ-Al 2 O 3 -multilayer includes 5-70 sublayers of κ-Al 2 O 3 .
11. The coated cutting tool of claim 1 , wherein a total coating thickness is 7-25 μm and the κ-Al 2 O 3 -multilayer includes 5-150 sublayers of κ-Al 2 O 3 .
12. The coated cutting tool of claim 1 , wherein the multilayer includes alternating sublayers of κ-Al 2 O 3 and sublayers of TiN.
13. The coated cutting tool of 1 , wherein the substrate is of cemented carbide or of cermet.
14. The coated cutting tool of claim 1 , wherein the substrate is of cemented carbide with a composition comprising 4-12 wt % Co, 0.1-10 wt % cubic carbides, nitrides or carbonitrides of metals from groups IVb, Vb and VIb) of the periodic table, including Ti, Nb, Ta or combinations thereof, and a balance of WC.