Cutting tool

Patent metadata

Field	Value
Publication number	US-10682707-B2
Application number	US-201615779532-A
Country	US
Kind code	B2
Filing date	Nov 28, 2016
Priority date	Nov 28, 2015
Publication date	Jun 16, 2020
Grant date	Jun 16, 2020

Abstract

In an aspect of the disclosure, a cutting tool includes a base member and a coating layer located on a surface of the base member. The coating layer includes a lower layer, an upper layer, and an intermediate layer located between the lower layer and the upper layer. The intermediate layer includes a first layer, a second layer, and a third layer. The first layer contains TiCx1Ny1Oz1 (0≤x1<1, 0≤y1<1, 0<z1<1, and x1+y1+z1=1). The second layer contains TiCx2Ny2Oz2 (0≤x2<1, 0≤y2<1, 0<z2<1, and x2+y2+z2=1). The third layer is located between the first layer and the second layer, and contains TiCx3Ny3Oz3 (0≤x3<1, 0≤y3<1, 0≤z3<1, and x3+y3+z3=1). Here, z1>z3 and z2>z3.

First claim

What is claimed is:

1. A cutting tool, comprising:
a base member; and
a coating layer located on a surface of the base member,
wherein the coating layer comprises:
a lower layer comprising titanium carbonitride;
an upper layer which is located above the lower layer and comprises aluminum oxide of α-type crystal structure; and
an intermediate layer located between the lower layer and the upper layer,
wherein the intermediate layer comprises:
 a first layer which is adjacent to the lower layer and comprises TiC x1 N y1 O z1 (0≤x1<1, 0≤y1<1, 0<z1<1, and x1+y1+z1=1),
 a second layer which is adjacent to the upper layer and comprises TiC x2 N y2 O z2 (0≤x2<1, 0≤y2<1, 0<z2<1, and x2+y2+z2=1, and
 a third layer which is located between the first layer and the second layer and comprises TiC x3 N y3 O z3 (0≤x3<1, 0≤y3<1, 0≤z3<1, and x3+y3+z3=1),
wherein z1>z3 and z2>z3,
wherein the second layer comprises a plurality of needle-shaped projections being projected upward in a cross section orthogonal to the surface of the base member, and
wherein the third layer comprises a first protrusion being protruded upward, and at least one of the plurality of needle-shaped projections is projected upward from a top portion of the first protrusion.

2. The cutting tool according to claim 1 , wherein z1<z2.

3. The cutting tool according to claim 1 , wherein
the lower layer comprises a second protrusion being protruded upward, and
the at least one of the plurality of needle-shaped projections is located on an imaginary straight line passing through a top portion of the first protrusion and a top portion of the second protrusion.

4. The cutting tool according to claim 3 , wherein
a length of the at least one of the plurality of needle-shaped projections on the imaginary straight line is greater than a length of the third layer on the imaginary straight line.

5. The cutting tool according to claim 1 , wherein
the second layer has a thickness of 10-35 nm.

6. The cutting tool according to claim 1 , wherein
the first layer has a thickness of 5-50 nm, and the third layer has a thickness of 50-300 nm.

7. The cutting tool according to claim 1 , wherein
an orientation coefficient Tc(104) of the upper layer is 2 or more from a surface side of the coating layer, and which is expressed by a following general formula Tc(hkl),
an orientation coefficient Tc(hkl)={I(hkl)/I 0 (hkl)}/[( 1/9)×Σ{I(HKL)/I 0 (hkl)}], wherein
(HKL) is a crystal plane of (012), (104), (110), (113), (024), (116), (214), (146), and (006),
I is peak strength ascribed to each of the crystal planes, and
I 0 is a standard diffraction intensity of each of crystal planes described on JCPDS (Joint Committee on Powder Diffraction Standards) card No. 00-010-0173.

8. The cutting tool according to claim 7 , wherein
the orientation coefficient Tc(104) on the base member side is smaller than the orientation coefficient Tc(104) on a surface side in the upper layer.

9. The cutting tool according to claim 7 , wherein
one of I(116) and I(104) has a strongest X-ray diffraction intensity I(hkl) from the surface side of the coating layer and another of I(116) and I(104) has a second strongest X-ray diffraction intensity I(hkl) from the surface side of the coating layer.

10. A cutting tool, comprising:
a base member; and
a coating layer located on a surface of the base member,
wherein the coating layer comprises:
a lower layer comprising titanium carbonitride;
an upper layer which is located above the lower layer and comprises aluminum oxide of α-type crystal structure; and
an intermediate layer located between the lower layer and the upper layer,
wherein the intermediate layer comprises:
 a first layer which is adjacent to the lower layer and comprises TiC x1 N y1 O z1 (0≤x1<1, 0≤y1<1, 0<z1<1, and x1+y1+z1=1),
 a second layer which is adjacent to the upper layer and comprises TiC x2 N y2 O z2 (0≤x2<1, 0≤y2<1, 0<z2<1, and x2+y2+z2=1, and
 a third layer which is located between the first layer and the second layer and comprises TiC x3 N y3 O z3 (0≤x3<1, 0≤y3<1, 0≤z3<1, and x3+y3+z3=1),

wherein z1>z3 and z2>z3, and
wherein the first layer has a thickness of 5-50 nm, and the third layer has a thickness of 50-300 nm.

Assignees

• Kyocera Corp

Inventors

• Kodama Yoshikazu
• Kubo Hayato
• Katsuma Tadashi
• Watanabe Kensaku
• Kumai Kenji

Classifications

• B22F1/05

  Metallic powder characterised by the size or surface area of the particles · CPC title

• C23C16/36 Primary

  Carbonitrides · CPC title

• B23B27/148 Primary

  Composition of the cutting inserts · CPC title

• B23B2200/0471

  Square · CPC title

• B22F3/1021

  Removal of binder or filler (removal of binder from ceramics C04B35/638) · CPC title