US 12,392,030 B2
Coated cutting tool
Carl Bjormander, Stockholm (SE)
Assigned to AB Sandvik Coromant, Sandviken (SE)
Appl. No. 17/801,113
Filed by AB SANDVIK COROMANT, Sandviken (SE)
PCT Filed Feb. 26, 2021, PCT No. PCT/EP2021/054880
§ 371(c)(1), (2) Date Aug. 19, 2022,
PCT Pub. No. WO2021/170824, PCT Pub. Date Sep. 2, 2021.
Claims priority of application No. 20159982 (EP), filed on Feb. 28, 2020.
Prior Publication US 2023/0093032 A1, Mar. 23, 2023
Int. Cl. C23C 16/36 (2006.01); B23B 27/14 (2006.01); C23C 16/56 (2006.01)
CPC C23C 16/36 (2013.01) [B23B 27/148 (2013.01); C23C 16/56 (2013.01); B23B 2228/105 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A coated cutting tool comprising:
a rake face, a flank face and a cutting edge in between the rake face and the flank face;
a base body of cemented carbide, cermet, ceramics, steel or high-speed steel; and
a coating having a total thickness of from 2 to 20 μm, wherein said coating comprises a layer of Ti1-xAlxCyNz with 0.40≤x≤0.95, 0≤y≤0.10 and 0.85≤z≤1.15, having a thickness of from 1 to 18 μm, wherein the layer of Ti1-xAlxCyNz includes crystallites with grain boundaries and being of a columnar structure, the Ti1-xAlxCyNz having a ≥85 vol-% face-centered cubic (fcc) crystal structure, and, on the rake face, a portion of MeCaNb, 0≤a≤1,0≤b≤1, a+b=1, present on the layer of Ti1-xAlxCyNz, wherein the layer of Ti1-xAlxCyNz together with the portion of MeCaNb forms an outermost part of the coating, Me is Ti and/or Zr, wherein a portion of MeCaNb in an area on the rake face at a distance of from 200 to 400 μm from the cutting edge covers from 5 to 28% of the layer of Ti1-xAlxCyNz (8), the portion of MeCaNb being distributed over said area.