Cutting tool

Patent metadata

Field	Value
Publication number	US-2023398607-A1
Application number	US-202118033564-A
Country	US
Kind code	A1
Filing date	Feb 17, 2021
Priority date	Feb 17, 2021
Publication date	Dec 14, 2023
Grant date	—

Abstract

A cutting tool includes a substrate and a hard layer, wherein
the hard layer includes a first unit layer and a second unit layer being alternately layered in the hard layer, a thickness of the first unit layer is 2 to 100 nm, a thickness of the second unit layer is 2 to 100 nm, the first unit layer is composed of Ti a Al b B c N, the second unit layer is composed Ti d Al e B f N, an atomic ratio a satisfy 0.25≤a<0.45, an atomic ratio b satisfy 0.55≤b<0.75, an atomic ratio c satisfy 0<c≤0.1, a total of the atomic ratios a, b and c is 1, an atomic ratio d satisfy 0.35≤d<0.55, an atomic ratio e satisfy 0.45≤e<0.65, an atomic ratio f satisfy 0<f≤0.1, a total of the atomic ratios d, e and f is 1, the atomic ratios a and d satisfy 0.05≤d−a≤0.2, and the atomic ratios b and e satisfy 0.05≤b−e≤0.2.

First claim

1 . A cutting tool comprising a substrate and a hard layer provided on the substrate, wherein
the hard layer includes a first unit layer and a second unit layer, one or a plurality of the first unit layers and one or a plurality of the second unit layers are alternately layered in the hard layer, a thickness of each of the one or plurality of first unit layers is 2 nm or more and 100 nm or less, a thickness of each of the one or plurality of second unit layers is 2 nm or more and 100 nm or less, the first unit layer is composed of a compound represented by Ti a Al b B c N, the second unit layer is composed of a compound represented by Ti a Al e B f N, an atomic ratio a of a titanium element in the Ti a Al b B c N is 0.25 or more and less than 0.45, an atomic ratio b of an aluminum element in the Ti a Al b B c N is 0.55 or more and less than 0.75, an atomic ratio c of a boron element in the Ti a Al b B c N is more than 0 and 0.1 or less, a total of the atomic ratio a, the atomic ratio b, and the atomic ratio c is 1, an atomic ratio d of a titanium element in the Ti a Al e B f N is 0.35 or more and less than 0.55, an atomic ratio e of an aluminum element in the Ti a Al e B f N is 0.45 or more and less than 0.65, an atomic ratio f of a boron element in the Ti a Al e B f N is more than 0 and 0.1 or less, a total of the atomic ratio d, the atomic ratio e, and the atomic ratio f is 1, the atomic ratio a and the atomic ratio d satisfy 0.05≤d−a≤0.2, and the atomic ratio b and the atomic ratio e satisfy 0.05≤b−e≤0.2.

2 . The cutting tool according to claim 1 , wherein a ratio I (200) /I (002) of an intensity I (200) of an X-ray diffraction peak of a (200) plane to an intensity I (200) of an X-ray diffraction peak of a (002) plane in the hard layer is 2 or more, and
a half-value width of the X-ray diffraction peak of the (002) plane is 2° or more.

3 . The cutting tool according to claim 1 , wherein a hardness H of the hard layer at a room temperature is 30 GPa or more.

4 . The cutting tool according to claim 3 , wherein a ratio H/E of the hardness H of the hard layer to a Young's modulus E of the hard layer at the room temperature is 0.07 or more.

5 . The cutting tool according to claim 1 , wherein a thickness of the hard layer is 1 μm or more and 20 μm or less.

6 . The cutting tool according to claim 2 , wherein the upper limit of ratio I (200) /I (002) is 10 or less, and the upper limit of the half-value width of the X-ray diffraction peak of the (002) plane is 4° or less.

7 . The cutting tool according to claim 4 , wherein a hardness H of the hard layer at a room temperature is 30 GPa or more and 50 GPa or less.

8 . The cutting tool according to claim 1 , wherein a Young's modulus E of the hard layer at a room temperature is 400 GPa or more and 700 GPa or less.

9 . The cutting tool according to claim 4 , wherein a ratio H/E of the hardness H of the hard layer to a Young's modulus E of the hard layer at the room temperature is 0.07 or more and 0.12 or less.

10 . The cutting tool according to claim 1 , wherein the atomic ratio a of a titanium element in the Ti a Al b B c N is 0.25 or more and 0.40 or less.

11 . The cutting tool according to claim 1 , wherein the atomic ratio b of an aluminum element in the Ti a Al b B c N is 0.60 or more and less than 0.75.

12 . The cutting tool according to claim 1 , wherein the atomic ratio c of a boron element in the Ti a Al b B c N is 0.01 or more and 0.09 or less.

13 . The cutting tool according to claim 1 , wherein the atomic ratio d of a titanium element in the Ti a Al e B f N is 0.35 or more and 0.50 or less.

14 . The cutting tool according to claim 1 , wherein the atomic ratio e of an aluminum element in the Ti a Al e B f N is 0.50 or more and less than 0.65.

15 . The cutting tool according to claim 1 , wherein the atomic ratio f of a boron element in the Ti a Al e B f N is 0.01 or more and 0.09 or less.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Suzuki Yuta
• FUKAE Kosuke

Classifications

• C04B41/524

  Multiple coatings, comprising a coating layer of the same material as a previous coating layer · CPC title

• C04B41/5068

  Titanium nitride · CPC title

• C04B41/5063

  Aluminium nitride · CPC title

• B23B2224/32

  Titanium carbide nitride (TiCN) · CPC title

• C23C30/005 Primary

  on hard metal substrates · CPC title