Cutting tool

Patent metadata

Field	Value
Publication number	US-12558728-B2
Application number	US-202218559073-A
Country	US
Kind code	B2
Filing date	May 6, 2022
Priority date	May 7, 2021
Publication date	Feb 24, 2026
Grant date	Feb 24, 2026

Abstract

A coated cutting tool includes a substrate at least partially coated with a coating. The substrate is made of cemented carbide composed of hard constituents in a metallic. The metallic binder includes more than 60 wt % Ni. The coating has two or more layers, wherein the layer adjacent to the substrate is a W(C x N 1-x ) y layer, wherein 0.6≤x≤0.8 and 1.1≤y≤1.8 with a W(C x N 1-x ) y layer thickness of 0.4-7 μm.

First claim

The invention claimed is:

1 . A coated cutting tool comprising a substrate at least partially coated with a coating, said substrate being made of cemented carbide composed of hard constituents in a metallic binder and wherein said metallic binder comprises more than 60 wt % Ni, said coating including two or more layers, wherein a layer adjacent to the substrate is a W(C x N 1-x ) y layer, wherein 0.6≤x≤0.8 and 1.1≤y≤1.8 with a W(C x N 1-x ) y layer thickness of 0.4-7 μm.

2 . The coated cutting tool according to claim 1 , wherein the W(C x N 1-x ) y layer is of hexagonal phase.

3 . The coated cutting tool of claim 1 , wherein the W(C x N 1-x ) y layer is composed of grains that are columnar.

4 . The coated cutting tool of claim 1 , wherein an average grain width of the W(C x N 1-x ) y layer is 0.14-0.40 μm.

5 . The coated cutting tool of claim 1 , wherein the W(C x N 1-x ) y layer exhibits an orientation as measured with EBSD on a cross section of said W(C x N 1-x ) y layer and an analyzed area of 100 μm in width and a full W(C x N 1-x ) y layer thickness in height, wherein a surface normal of the W(C x N 1-x ) y layer is parallel to a growth direction of said layer, wherein ≥75% of the analyzed area has a <11-20> direction within 30 degrees from the surface normal of the W(C x N 1-x ) y layer.

6 . The coated cutting tool of claim 1 , wherein the metallic binder comprises 65-90 wt % Ni.

7 . The coated cutting tool of claim 1 , wherein the metallic binder content in the cemented carbide is 3-20 wt %.

8 . The coated cutting tool of claim 1 , wherein the coating includes a TiCN layer, wherein a thickness of the TiCN layer is 6-12 μm.

9 . The coated cutting tool of claim 8 , wherein the TiCN layer exhibits a texture coefficient TC(hkl), as measured by X-ray diffraction using Cu Kα radiation and θ-2θ scan, defined according to Harris formula

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where I(hkl) is the measured intensity (integrated 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 20), (3 1 1), (3 3 1), (4 2 0), (4 2 2) and (5 1 1), wherein TC(4 2 2) is ≥3.5.

10 . The coated cutting tool of claim 1 , wherein a total thickness of the coating is 2-25 μm.

11 . The coated cutting tool of claim 1 , wherein the coating further includes a layer of Al 2 O 3 , preferably located between an outermost surface of the cutting tool and a W(C x N 1-x ) y layer.

12 . The coated cutting tool of claim 11 , wherein the Al 2 O 3 layer is an α-Al 2 O 3 layer.

13 . The coated cutting tool of claim 12 , wherein said α-Al 2 O 3 layer exhibits a texture coefficient TC(hkl), as measured by X-ray diffraction using Cu Kα radiation and θ-2θ scan, defined according to Harris formula, where I(hkl) is the measured intensity (integrated area) of the (hkl) reflection, I 0 (hkl) is the standard intensity according to ICDD's PDF-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), wherein TC(0 0 12)≥5.

14 . The coated cutting tool of claim 11 , wherein a thickness of the Al 2 O 3 layer is 4-8 μm.

15 . The coated cutting tool of claim 1 , wherein the coating is a CVD coating.

Assignees

• Sandvik Coromant Ab

Inventors

• Von Fieandt Linus
• Lindahl Erik
• Boor Katalin

Classifications

• C23C16/403

  of aluminium, magnesium or beryllium · CPC title

• C23C16/36

  Carbonitrides · CPC title

• C23C16/34

  Nitrides {(C23C16/303 takes precedence)} · CPC title

• C23C16/308

  Oxynitrides · CPC title

• C23C16/0272

  Deposition of sub-layers, e.g. to promote the adhesion of the main coating · CPC title