Cutting tool

Patent metadata

Field	Value
Publication number	US-2017009352-A1
Application number	US-201415039927-A
Country	US
Kind code	A1
Filing date	Nov 26, 2014
Priority date	Nov 29, 2013
Publication date	Jan 12, 2017
Grant date	—

Abstract

A cutting tool includes: a base including cemented carbide containing Cr; and a coating layer including a Ti-based layer including at least a layer of Ti(C x1 N y1 O z1 ) (0≦x1≦1, 0≦y1≦1, 0≦z1≦1, x1+y1+z1=1), an Al 2 O 3 layer, and an outermost layer of Ti(C x3 N y3 O z3 ) (0≦x3≦1, 0≦y3≦1, 0≦z3≦1, x3+y3+z3=1), and a content of Cr contained at a first Ti-based layer of the Ti-based layer is lower than a content of Cr contained in the base, and higher than a content of Cr contained at the Al 2 O 3 layer, and a content of Cr contained at the outermost layer is higher than the content of Cr contained at the Al 2 O 3 layer in a glow-discharge emission spectrometry.

First claim

1 . A cutting tool comprising:
a base including cemented carbide containing Cr; and a coating layer comprising a Ti-based layer including at least a layer of Ti(C x1 N y1 O z1 ) (0≦x1≦1, 0≦y1≦1, 0≦z1≦1, x1+y1+z1=1), an Al 2 O 3 layer, and an outermost layer of Ti(C x3 N y3 O z3 ) (0≦x3≦1, 0≦y3≦1, 0≦z3≦1, x3+y3+z3=1), which are laminated in order from the base side on a surface of the base, wherein a content of Cr contained at a thickness-center position of a first Ti-based layer of the Ti-based layer on a side closer to the base is lower than a content of Cr contained in the base, and higher than a content of Cr contained at a thickness-center position of the Al 2 O 3 layer, and a content of Cr contained at a thickness-center position of the outermost layer is higher than the content of Cr contained at the thickness-center position of the Al 2 O 3 layer in a glow-discharge emission spectrometry (GDS analysis).

2 . The cutting tool according to claim 1 , wherein when ratios of the contents of Cr contained at the thickness-center positions of the respective layers of the first Ti-based layer, the Al 2 O 3 layer, and the outermost layer to the content of Cr contained in the base are respectively represented by Cr Ti , Cr Al , and Cr s , the following conditions are met: 0.5≦Cr Ti ≦0.9; 0.01≦Cr Al ≦0.2; and 0.4≦Cr s ≦0.7 in the glow-discharge emission spectrometry.

3 . The cutting tool according to claim 2 , wherein when ratios of contents of W and Co contained in the respective layers of the first Ti-based layer, the Al 2 O 3 layer, and the outermost layer to contents of W and Co contained in the base are respectively represented by W Ti , W Al , W s , Co Ti , Co Al , and Co s , the following conditions are met: 0.05≦W Ti ≦0.3; W Al ≦0.01; W s ≦0.01; 0.05≦Co Ti ≦0.3; Co Al ≦0.01; and Co s ≦0.01 in the glow-discharge emission spectrometry.

4 . The cutting tool according to claim 2 , wherein Si and Fe are contained in the base, and when ratios of contents of Si and Fe contained in the respective layers of the first Ti-based layer, the Al 2 O 3 layer, and the outermost layer to contents of Si and Fe contained in the base are respectively represented by Si Ti , Si Al , Si s , Fe Ti , Fe Al , and Fe s , the following conditions are met: 0.05≦Si Ti ≦0.4; Si Al ≦0.01; Si s ≦0.01; 0.05≦Fe Ti ≦0.4; Fe Al ≦0.01; and Fe s ≦0.01 in the glow-discharge emission spectrometry.

5 . The cutting tool according to claim 2 , wherein when ratios of contents of C contained in the respective layers of the first Ti-based layer, the Al 2 O 3 layer, and the outermost layer to a content of C contained in the base are respectively represented by C Ti , C Al , and C s , the following conditions are met: 0.2≦C Ti ≦0.7; C Al ≦0.01; and C s ≦0.30 in the glow-discharge emission spectrometry.

6 . The cutting tool according to claim 1 , wherein the coating layer further comprises an intermediate layer of (Ti,Al)(C x2 N y2 O z2 ) (0≦x2≦1, 0≦y2≦1, 0≦z2≦1, x2+y2+z2=1) between the Ti-based layer and the Al 2 O 3 layer.

7 . The cutting tool according to claim 6 , wherein when a ratio of a content of Cr contained at a thickness-center position of the intermediate layer to the content of Cr contained in the base is represented by Cr m , the following condition is met: 0.2≦Cr m ≦0.5 in the glow-discharge emission spectrometry.

8 . The cutting tool according to claim 6 , wherein when ratios of contents of W and Co contained in the intermediate layer to contents of W and Co contained in the base are respectively represented by W m and Co m , the following conditions are met: W m ≦0.05 and Co m ≦0.05 in the glow-discharge emission spectrometry.

9 . The cutting tool according to claim 6 , wherein when ratios of contents of Si and Fe contained in the intermediate layer to contents of Si and Fe contained in the base are respectively represented by Si m and Fe m , the following conditions are met: Si m ≦0.05 and Fe m ≦0.05 in the glow-discharge emission spectrometry.

10 . The cutting tool according to claim 6 , wherein when a ratio of a content of C contained in the intermediate layer to a content of C contained in the base is represented by C m , the following condition is met: 0.01≦C m ≦0.18.

Assignees

• Kyocera Corp

Inventors

• Kubo Hayato
• Ri Kou

Classifications

• C23C16/403

  of aluminium, magnesium or beryllium · CPC title

• B23C5/16

  characterised by physical features other than shape · CPC title

• C23C16/34 Primary

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

• B23B27/14 Primary

  Cutting tools of which the bits or tips {or cutting inserts} are of special material · CPC title

• C23C28/042

  including a refractory ceramic layer, e.g. refractory metal oxides, ZrO2, rare earth oxides · CPC title