Coated cutting tool

Patent metadata

Field	Value
Publication number	US-2018236563-A1
Application number	US-201615749726-A
Country	US
Kind code	A1
Filing date	Jul 21, 2016
Priority date	Aug 3, 2015
Publication date	Aug 23, 2018
Grant date	—

Abstract

A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate is provided, the coating layer including an alternating laminate structure in which two or more compound layers of each of two or three or more kinds, each kind having a different composition, are laminated in an alternating manner, wherein: the alternating laminate structure is constituted by: a compound layer containing a compound having a composition represented by (Ti x M 1-x )N [wherein M denotes an element of at least one kind selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al and Si, x denotes an atomic ratio of Ti based on a total of Ti and an element denoted by M, and x satisfies 0.57≤x≤0.91]; and a compound layer containing a compound having a composition represented by (Ti y M 1-y )N [wherein M denotes an element of at least one kind selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al and Si, y denotes an atomic ratio of Ti based on a total of Ti and an element denoted by M, and y satisfies 0.61≤x≤0.95]; an absolute value of a difference between an amount of a specific metal element contained in a compound layer which constitutes the alternating laminate structure relative to an amount of all the metal elements contained therein and an amount of the specific metal element contained in another compound layer which is adjacent to the compound layer and which constitutes the alternating laminate structure relative to an amount of all the metal elements contained therein, is more than 0 atom % and less than 5 atom %; and an average thickness of each of the compound layers is from 1 nm or more to 50 nm or less, and an average thickness of the alternating laminate structure is from 1.5 μm or more to 15.0 μm or less.

First claim

1 . A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, the coating layer including an alternating laminate structure in which two or more compound layers of each of two or three or more kinds, each kind having a different composition, are laminated in an alternating manner, wherein:
the alternating laminate structure is constituted by: a compound layer containing a compound having a composition represented by formula (1) below:
(Ti x M 1-x )N  (1)

wherein M denotes an element of at least one kind selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al and Si, x denotes an atomic ratio of Ti based on a total of Ti and an element denoted by M, and x satisfies 0.57≤x≤0.91; and
a compound layer containing a compound having a composition represented by formula (2) below:
(Ti y M 1-y )N  (2)

wherein M denotes an element of at least one kind selected from the group consisting of Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al and Si, y denotes an atomic ratio of Ti based on a total of Ti and an element denoted by M, and y satisfies 0.61≤x≤0.95;
an absolute value of a difference between an amount of a specific metal element contained in a compound layer which constitutes the alternating laminate structure relative to an amount of all the metal elements contained therein and an amount of the specific metal element contained in another compound layer which is adjacent to the compound layer and which constitutes the alternating laminate structure relative to an amount of all the metal elements contained therein, is more than 0 atom % and less than 5 atom %; and
an average thickness of each of the compound layers is from 1 nm or more to 50 nm or less, and an average thickness of the alternating laminate structure is from 1.5 μm or more to 15.0 μm or less.

2 . The coated cutting tool according to claim 1 , wherein the absolute value is from 1 atom % or higher to 4 atom % or lower.

3 . The coated cutting tool according to claim 1 , wherein:
the coated cutting tool includes a cutting edge in an intersecting edge between a rake surface and a flank; and when regarding a Ti content, on an atom basis, of the alternating laminate structure in the rake surface as denoted by Ti r , and regarding a Ti content, on an atom basis, of the alternating laminate structure in the flank as denoted by Ti f , a ratio of Ti f to Ti r , [Ti f /Ti r ] is from 1.05 or more to 1.20 or less.

4 . The coated cutting tool according to claim 1 , wherein:
the coating layer includes a lower layer between the substrate and the alternating laminate structure; the lower layer is comprised of a single layer or a laminate of a compound of: an element of at least one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and Y; and an element of at least one kind selected from the group consisting of C, N, O and B; and an average thickness of the lower layer is from 0.1 μm or more to 3.5 μm or less.

5 . The coated cutting tool according to claim 1 , wherein:
the coating layer includes an upper layer on a surface of the alternating laminate structure; the upper layer is comprised of a single layer or a laminate of a compound of: an element of at least one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and Y; and an element of at least one kind selected from the group consisting of C, N, O and B; and an average thickness of the upper layer is from 0.1 μm or more to 3.5 μm or less.

6 . The coated cutting tool according to claim 1 , wherein an average thickness of the coating layer in its entirety is from 1.5 μm or more to 15 μm or less.

7 . The coated cutting tool according to claim 1 , wherein the substrate is a cemented carbide, cermet, ceramics or a cubic boron nitride sintered body.

8 . The coated cutting tool according to claim 2 , wherein:
the coated cutting tool includes a cutting edge in an intersecting edge between a rake surface and a flank; and when regarding a Ti content, on an atom basis, of the alternating laminate structure in the rake surface as denoted by Ti r , and regarding a Ti content, on an atom basis, of the alternating laminate structure in the flank as denoted by Ti f , a ratio of Ti f to Ti r , [Ti f /Ti r ] is from 1.05 or more to 1.20 or less.

9 . The coated cutting tool according to claim 2 , wherein:
the coating layer includes a lower layer between the substrate and the alternating laminate structure; the lower layer is comprised of a single layer or a laminate of a compound of: an element of at least one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and Y; and an element of at least one kind selected from the group consisting of C, N, O and B; and an average thickness of the lower layer is from 0.1 μm or more to 3.5 μm or less.

10 . The coated cutting tool according to claim 2 , wherein:
the coating layer includes an upper layer on a surface of the alternating laminate structure; the upper layer is comprised of a single layer or a laminate of a compound of: an element of at least one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and Y; and an element of at least one kind selected from the group consisting of C, N, O and B; and an average thickness of the upper layer is from 0.1 μm or more to 3.5 μm or less.

11 . The coated cutting tool according to claim 2 , wherein an average thickness of the coating layer in its entirety is from 1.5 μm or more to 15 μm or less.

12 . The coated cutting tool according to claim 2 , wherein the substrate is a cemented carbide, cermet, ceramics or a cubic boron nitride sintered body.

13 . The coated cutting tool according to claim 3 , wherein:
the coating layer includes a lower layer between the substrate and the alternating laminate structure; the lower layer is comprised of a single layer or a laminate of a compound of: an element of at least one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and Y; and an element of at least one kind selected from the group consisting of C, N, O and B; and an average thickness of the lower layer is from 0.1 μm or more to 3.5 μm or less.

14 . The coated cutting tool according to claim 3 , wherein:
the coating layer includes an upper layer on a surface of the alternating laminate structure; the upper layer is comprised of a single layer or a laminate of a compound of: an element of at least one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and Y; and an element of at least one kind selected from the group consisting of C, N, O and B; and an average thickness of the upper layer is from 0.1 μm or more to 3.5 μm or less.

15 . The coated cutting tool according to claim 3 , wherein an average thickness of the coating layer in its entirety is from 1.5 μm or more to 15 μm or less.

16 . The coated cutting tool according to claim 3 , wherein the substrate is a cemented carbide, cermet, ceramics or a cubic boron nitride sintered body.

17 . The coated cutting tool according to claim 4 , wherein:
the coating layer includes an upper layer on a surface of the alternating laminate structure; the upper layer is comprised of a single layer or a laminate of a compound of: an element of at least one kind selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si and Y; and an element of at least one kind selected from the group consisting of C, N, O and B; and an average thickness of

Assignees

• Tungaloy Corp

Inventors

• Hirano Yusuke
• Tanaka Shigeki

Classifications

• C23C28/044

  coatings specially adapted for cutting tools or wear applications · CPC title

• C23C28/42

  characterized by the composition of the alternating layers · CPC title

• C23C28/44

  characterized by a measurable physical property of the alternating layer or system, e.g. thickness, density, hardness · CPC title

• B23B27/148 Primary

  Composition of the cutting inserts · CPC title

• B23B51/00

  Tools for drilling machines · CPC title