US 12,031,207 B2
Coated cutting tool
Erik Lindahl, Knivsta (SE); and Linus Von Fieandt, Uppsala (SE)
Assigned to Sandvik Intellectual Property AB, Sandviken (SE)
Appl. No. 16/500,854
Filed by SANDVIK INTELLECTUAL PROPERTY AB, Sandviken (SE)
PCT Filed Mar. 26, 2018, PCT No. PCT/EP2018/057622
§ 371(c)(1), (2) Date Oct. 4, 2019,
PCT Pub. No. WO2018/184887, PCT Pub. Date Oct. 11, 2018.
Claims priority of application No. 17165547 (EP), filed on Apr. 7, 2017.
Prior Publication US 2020/0141007 A1, May 7, 2020
This patent is subject to a terminal disclaimer.
Int. Cl. C23C 16/36 (2006.01); C23C 16/40 (2006.01); C23C 28/04 (2006.01); C23C 30/00 (2006.01)
CPC C23C 16/36 (2013.01) [C23C 16/403 (2013.01); C23C 28/044 (2013.01); C23C 30/005 (2013.01); B23B 2224/32 (2013.01)] 12 Claims
 
1. A coated cutting tool comprising a substrate coated with a multi-layered wear resistant coating including a layer of α-Al2O3 and a MTCVD layer of titanium carbonitride TixCyN1-y, with 0.85≤x≤1.3—and 0.4≤y≤0.85, deposited on the α-Al2O3 layer, wherein the MTCVD TixCyN1-y layer exhibits a mean hardness of 25-37 GPa, and wherein the TixCyN1-y exhibits a texture coefficient TC(hkl), as measured by X-ray diffraction using CuKα radiation and θ-2θ scan, the TC(hkl) being defined according to Harris formula:

OG Complex Work Unit Math
wherein
I(hkl) is the measured intensity (integrated area) of the (hkl) reflection;
I0(hkl) is standard intensity of the standard powder diffraction data according to JCPDS card no. 42-1489;
n is the number of reflections used in the calculation, and where the (hkl) reflections used are (1 1 1), (2 0 0), (2 2 0), (3 1 1), (3 3 1), (4 2 0) and (4 2 2);
TC(1 1 1)≥3; and
wherein the α-Al2O3 layer exhibits a texture coefficient TC(hkl), as measured by X-ray diffraction using CuKα radiation an θ-2θ scan, defined according to Harris formula, wherein I(hkl) is the measured intensity (integrated area) of the (hkl) reflection, I0(hkl) is standard intensity of the standard powder diffraction data according to JCPDS card no. 00-010-0173, n is the number of reflections used in the calculation, and where the (hkl) reflections used are (1 0 4), (1 1 0), (1 1 3), (0 2 4), (1 1 6), (2 1 4), (3 0 0) and (0 0 12) and TC(0 0 12)≥7.