Coated member

Patent metadata

Field	Value
Publication number	US-10640868-B2
Application number	US-201615569443-A
Country	US
Kind code	B2
Filing date	Apr 19, 2016
Priority date	Apr 27, 2015
Publication date	May 5, 2020
Grant date	May 5, 2020

Abstract

According to the present disclosure, a coated member is provided with a base material and a diamond layer located on the base material. When a ratio (SP3/SP2) obtainable from an SP3 peak derived from diamond crystals measurable by Raman spectroscopy and an SP2 peak derived from a graphite phase is referred to as an SP3 ratio, an SP3 ratio at a first measuring point with a thickness up to 1 μm extending from an interface of the base material and the diamond layer toward the diamond layer is higher than an SP3 ratio at a second measuring point that is intermediate in a thickness direction of the diamond layer.

First claim

What is claimed is:

1. A coated member comprising:
a base material; and
a diamond layer located over the base material,
wherein, when a ratio (SP3/SP2) obtainable from an SP3 peak derived from diamond crystals measurable by Raman spectroscopy and an SP2 peak derived from a graphite phase is referred to as an SP3 ratio, an SP3 ratio at a first measuring point with a thickness up to 1 μm extending from an interface of the base material and the diamond layer toward the diamond layer is higher than an SP3 ratio at a second measuring point that is intermediate in a thickness direction of the diamond layer.

2. The coated member according to claim 1 , wherein the SP3 ratio at the first measuring point of the diamond layer is 1.1-1.8, and the SP3 ratio at the second measuring point of the diamond layer is 1.0-1.5.

3. The coated member according to claim 1 , wherein a residual stress at the first measuring point is a compressive stress, and a residual stress at the second measuring point is a tensile stress.

4. The coated member according to claim 1 , further comprising:
an interface region located between the base material and the main layer, the interface region including the first measuring point,
wherein the interface region comprises a maximum diamond crystal having a largest particle diameter when, in a fracture surface including the base material and the diamond layer, a comparison is made in terms of particle diameter of diamond crystals in a thickness direction of the diamond layer.

5. The coated member according to claim 4 , wherein the interface region exists in a thickness of 0.3-2 μm.

6. The coated member according to claim 4 , wherein the maximum diamond crystal in a fracture surface of the diamond layer has a longer diameter in the thickness direction of the diamond layer, and the maximum diamond crystal has an aspect ratio of 1.8 or more.

7. The coated member according to claim 4 , wherein a particle diameter of the maximum diamond crystal in a fracture surface of the diamond layer is 0.15-0.5 μm.

8. The coated member according to claim 1 , wherein a thickness of the diamond layer is 3-20 μm.

9. The coated member according to claim 4 , wherein, when, in a polished surface including the base material and the diamond layer, a comparison is made in terms of particle diameter of diamond crystals in a thickness direction of the diamond layer, a ratio (d2/d1) of a first mean particle diameter d1 of diamond crystals in the interface region and a second mean particle diameter d2 of diamond crystals in an intermediate region over the interface region and including the second measuring point is 1.0-1.2.

10. The coated member according to claim 1 , wherein in a polished surface including the base material and the diamond layer, a main crystal phase constituting the base material located in the interface comprises a recess on a surface opposed to the diamond layer.

11. The coated member according to claim 1 , wherein the base material contains cobalt, a base material-side interface region extending 0.5-5 μm from the interface has a lower content of the cobalt than at a position 500 μm away from the interface, and the cobalt exists in a granular shape in the base material-side interface region.

12. The coated member according to claim 1 , wherein an interface roughness in the interface is 0.12-0.8 μm.

13. The coated member according to claim 1 , wherein an SP3 ratio at a third measuring point with a thickness up to 1 μm extending from a surface of the diamond layer is lower than the SP3 ratio at the second measuring point in the diamond layer.

14. The coated member according to claim 13 , wherein, when a comparison is made in terms of particle diameter of diamond crystals in a thickness direction of the diamond layer in a polished cross-section including the base material and the diamond layer, a surface region including the third measuring point exists, the surface region comprises smaller diamond crystals than at the second measuring point, and a thickness of the surface region is 0.1-2 μm.

15. The coated member according to claim 1 , wherein the diamond layer has a thickness of 2 μm or more.

Assignees

• Kyocera Corp

Inventors

• Waki Masahiro
• Ka Tan

Classifications

• B23B2226/31

  Diamond · CPC title

• C23C16/279

  control of diamond crystallography · CPC title

• C23C16/271 Primary

  using hot filaments · CPC title

• B23B27/20

  with diamond bits {or cutting inserts} · CPC title

• B23B27/148

  Composition of the cutting inserts · CPC title