US 12,305,293 B2
Coated cutting tool
Linus Von Fieandt, Uppsala (SE); Raluca Morjan Brenning, Uppsala (SE); and Jan Engqvist, Uppsala (SE)
Assigned to AB Sandvik Coromant, Sandviken (SE)
Appl. No. 17/613,152
Filed by AB SANDVIK COROMANT, Sandviken (SE)
PCT Filed May 26, 2020, PCT No. PCT/EP2020/064492
§ 371(c)(1), (2) Date Nov. 22, 2021,
PCT Pub. No. WO2020/239718, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 19176705 (EP), filed on May 27, 2019.
Prior Publication US 2022/0205109 A1, Jun. 30, 2022
Int. Cl. C23C 28/04 (2006.01); C22C 29/06 (2006.01); C22C 29/08 (2006.01); C23C 16/34 (2006.01); C23C 16/36 (2006.01)
CPC C23C 28/044 (2013.01) [C22C 29/067 (2013.01); C22C 29/08 (2013.01); C23C 16/34 (2013.01); C23C 16/36 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A method of making a coated cutting tool, the method comprising chemical vapor deposition of a coating including an inner layer of TiN and a subsequent layer of TiCN on a substrate, wherein the substrate is made of cemented carbide composed of carbide constituents in a metallic binder and wherein the metallic binder comprises 60 to 90 wt % Ni, wherein the TiN layer is deposited on the cemented carbide substrate in two subsequent steps at a temperature of about 850-900° C. and a pressure of about 300-600 mbar: a first TiN deposition of TiN-1, followed by a second TiN deposition of TiN-2, the TiN-1 deposition is performed in a gas comprising 1-1.5 vol % TiCl4 and H2 and N2, wherein the volume ratio H2/N2 is 0.05-0.18, and wherein the gas comprises 0.5-1.5 vol % HCl, and the TiN-2 deposition is performed in a gas comprising 2-3 vol % TiCl4 and H2 and N2, wherein the volume ratio H2/N2 is 0.8-2.5.