Surface-coated boron nitride sintered body tool

Patent metadata

Field	Value
Publication number	US-10030299-B2
Application number	US-201415032976-A
Country	US
Kind code	B2
Filing date	Sep 19, 2014
Priority date	Oct 31, 2013
Publication date	Jul 24, 2018
Grant date	Jul 24, 2018

Abstract

A surface-coated boron nitride sintered body tool includes a cubic boron nitride sintered body and a coating film formed thereon. The coating film includes an A layer and a C layer. The A layer is formed of Ti1-xaMaxaC1-yaNya (where Ma is one or more of Cr, Nb and W; 0≤xa≤0.7; 0≤ya≤1). The C layer is formed of Al1-(xc+yc)CrxcMcycN (where Mc is one or more of Ti, V and Si; 0.2≤xc≤0.8; 0≤yc≤0.6; 0.2≤xc+yc≤0.8). The A layer is formed on an outermost surface of the coating film or between the outermost surface of the coating film and the C layer. A distance between the outermost surface of the coating film and an upper surface of the C layer is 0.1 μm or more and 1.0 μm or less.

First claim

The invention claimed is:

1. A surface-coated boron nitride sintered body tool comprising: a cubic boron nitride sintered body; and a coating film formed thereon,
the coating film including an A layer and a C layer,
the A layer being formed of Ti 1-xa Ma xa C 1-ya N ya (where Ma is one or more of Cr, Nb and W; xa is 0≤xa≤0.7; and ya is 0≤ya≤1),
the C layer being formed of Al 1-(xc+yc) Cr xc Mc yc N (where Mc is one or more of Ti, V and Si; xc is 0.2≤xc≤0.8; yc is 0≤yc≤0.6; and xc+yc is 0.2≤xc+yc≤0.8),
the A layer being formed on an outermost surface of the coating film or between the outermost surface of the coating film and the C layer,
a distance between the outermost surface of the coating film and an upper surface of the C layer being 0.1 μm or more and 1.0 μm or less, and
a thickness of the A layer is 0.1 μm or more and 0.7 μm or less.

2. The surface-coated boron nitride sintered body tool according to claim 1 , wherein the distance between the outermost surface of the coating film and the upper surface of the C layer is 0.3 μm or more and 0.7 μm or less.

3. The surface-coated boron nitride sintered body tool according to claim 1 , wherein the C layer has a thickness of 0.1 μm or more and 1.0 μm or less.

4. The surface-coated boron nitride sintered body tool according to claim 1 , wherein the coating film includes a plurality of the A layers and a plurality of the C layers, and includes two or more laminated units each having the A layer disposed on the C layer.

5. The surface-coated boron nitride sintered body tool according to claim 1 , wherein
the coating film further includes a B layer between the A layer and the C layer, and
the B layer contains one or more compounds formed of: one or more elements selected from the group consisting of Al, Cr and Ti; and N.

6. The surface-coated boron nitride sintered body tool according to claim 5 , wherein the B layer includes a multilayer structure formed by alternately laminating one or more B1 layers each formed of TiN and one or more B2 layers each formed of AlCrN.

7. The surface-coated boron nitride sintered body tool according to claim 6 , wherein the B1 layers and the B2 layers each have a thickness of 0.5 nm or more and less than 30 nm.

8. The surface-coated boron nitride sintered body tool according to claim 5 , wherein the B layer contains a compound formed of AlTiCrN.

9. The surface-coated boron nitride sintered body tool according to claim 1 , wherein the A layer includes a region in which the ya changes in a slope-like manner or in a step-like manner in a thickness direction of the A layer.

10. The surface-coated boron nitride sintered body tool according to claim 1 , wherein the C layer is in contact with the cubic boron nitride sintered body.

11. The surface-coated boron nitride sintered body tool according to claim 1 , wherein the coating film has a thickness of 0.5 μm or more and 10 μm or less.

Assignees

• Sumitomo Electric Hardmetal Corp

Inventors

• Tsukihara Nozomi
• Setoyama Makoto
• Okamura Katsumi

Classifications

• B23B2226/125

  cubic [CBN] · CPC title

• C04B41/89 Primary

  for obtaining at least two superposed coatings having different compositions · CPC title

• C04B41/52

  Multiple coating or impregnating {multiple coating or impregnating with the same composition or with compositions only differing in the concentration of the constituents, is classified as single coating or impregnation} · CPC title

• C23C14/24

  Vacuum evaporation · CPC title

• C23C14/0641

  Nitrides (C23C14/0617 takes precedence) · CPC title