Surface-coated cutting tool

Patent metadata

Field	Value
Publication number	US-2019247930-A1
Application number	US-201715779735-A
Country	US
Kind code	A1
Filing date	Sep 20, 2017
Priority date	Nov 29, 2016
Publication date	Aug 15, 2019
Grant date	—

Abstract

Provided is a surface-coated cutting tool including a base material and a coating including a super-multilayer-structure layer where A layers and B layers different from the A layers in composition are alternately laminated. The super-multilayer-structure layer includes an X area and a Y area those are alternately repeated. In the X area, A layers having a thickness AX and B layers having a thickness BX are alternately laminated. In the Y area, A layers having a thickness AY and B layers having a thickness BY are alternately laminated. The thickness AX is larger than the thickness AY, and the thickness BX is smaller than the thickness BY. Each of the A layers and the B layers comprising one or more elements selected from a group consisting of Ti, Al, Cr, Si, Ta, Nb, and W, and one or more elements selected from a group consisting of C and N.

First claim

1 . A surface-coated cutting tool comprising:
a base material; and a coating covering a surface of the base material, the coating including a super-multilayer-structure layer where A layers and B layers different from the A layers in composition are alternately laminated from a base material side to a surface side, the super-multilayer-structure layer having a construction in which an X area and a Y area are alternately repeated from the base material side to the surface side, the X area being an area where A layers having a thickness A X and B layers having a thickness B X are alternately laminated, the Y area being an area where A layers having a thickness A Y and B layers having a thickness B Y are alternately laminated, the thickness A X of the A layers being larger than the thickness A Y of the A layers, the thickness B X of the B layers being smaller than the thickness B Y of the B layers, each of the A layers and the B layers having a composition comprising one or more elements selected from a group consisting of Ti, Al, Cr, Si, Ta, Nb, and W, and one or more elements selected from a group consisting of C and N, each of the A layers being a compound layer containing Al, Cr, and N, each of the B layers being a compound layer containing Al, Ti, Si, and N.

2 . The surface-coated cutting tool according to claim 1 , wherein
on a coordinate system having a vertical axis representing a thickness and having a horizontal axis representing a distance from the base material for each layer constituting the super-multilayer-structure layer, a graph A obtained by putting plots of the A layers included in the super-multilayer-structure layer and by connecting the plots with a straight line shows a wavy pattern where a peak area and a valley area are alternately repeated, and a graph B obtained by putting plots of the B layers included in the super-multilayer-structure layer and by connecting the plots with a straight line shows a wavy pattern where a peak area and a valley area are alternately repeated, wherein
in the graph A, the A layers constituting the peak area are the A layers constituting the X area, and the A layers constituting the valley area are the A layers constituting the Y area,
in the graph B, the B layers constituting the peak area are the B layers constituting the Y area, and the B layers constituting the valley area are the B layers constituting the X area.

3 . The surface-coated cutting tool according to claim 1 , wherein an XY area composed of the X area and the one Y area adjacent to the X area has a thickness of less than or equal to 300 nm.

4 . The surface-coated cutting tool according to claim 1 , wherein an XY area composed of the X area and the one Y area adjacent to the X area includes the 4 to 10 A layers both inclusive and the 4 to 10 B layers both inclusive.

5 . The surface-coated cutting tool according to claim 1 , wherein each of the A layers and the B layers has a thickness of 0.5 nm to 30 nm both inclusive.

6 . The surface-coated cutting tool according to claim 1 , wherein the super-multilayer-structure layer has a thickness of 1 μm to 20 μm both inclusive.

7 . (canceled)

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Tanaka Keizo
• Setoyama Makoto
• Kobayashi Yutaka
• Kobayashi Akira

Classifications

• C23C28/044

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

• C23C28/04

  only coatings of inorganic non-metallic material · CPC title

• C23C30/005

  on hard metal substrates · CPC title

• C23C28/042

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

• C23C28/42

  characterized by the composition of the alternating layers · CPC title