Tool having a boron doped diamond coating

Patent metadata

Field	Value
Publication number	US-11292066-B2
Application number	US-201716468795-A
Country	US
Kind code	B2
Filing date	Jan 16, 2017
Priority date	Jan 16, 2017
Publication date	Apr 5, 2022
Grant date	Apr 5, 2022

Abstract

To provide a tool that ensures improved durability even when a diamond coating containing boron is formed. A diamond coating (40) includes a first layer (41) that is formed as a layer on a surface layer side of the diamond coating (40) and is regarded as containing no boron, and a second layer (42) positioned on a side of a base material (30) with respect to the first layer (41) and contains at least 1000 ppm or more of the boron. Since the first layer (41) with a larger compressive stress is formed on the surface layer of the diamond coating (40), a crack generation from the surface layer side of the diamond coating (40) during the process can be reduced. Consequently, the durability of a tool (1) can be improved even when the diamond coating (40) containing 1,000 ppm or more of boron is formed.

First claim

The invention claimed is:

1. A tool comprising:
a base material;
diamond coatings laminated from a base material side of the tool to a surface layer side of the tool, each diamond coating comprising a first layer of diamond containing no boron and a second layer of diamond containing at least 1000 ppm of boron;
wherein the diamond coatings comprise a first set of diamond coatings having same thicknesses, a second set of diamond coatings having same thicknesses and a third set of diamond coatings having same thicknesses, laminated from the base material side of the tool to the surface layer side of the tool, wherein a boron concentration in the second layer of the diamond coating in the third set of diamond coatings on the surface layer side of the tool is greater than a boron concentration in the second layer of the diamond coating in the first set of diamond coatings on the base material,
wherein a thickness of the first layer of diamond in the first set of diamond coatings is greater than a thickness of the first layer of diamond in the second set of diamond coatings, and a thickness of the first layer of diamond in the second set of diamond coatings is greater than a thickness of the first layer of diamond in the third set of diamond coatings, and
wherein a thickness of the second layer of diamond in the first set of diamond coatings is greater than a thickness of the second layer of diamond in the second set of diamond coatings, and a thickness of the second layer of diamond in the second set of diamond coatings is greater than a thickness of the second layer of diamond in the third set of diamond coatings.

2. The tool according to claim 1 ,
wherein the first layer of diamond in the first set of diamond coatings has a film thickness 10% to 50% of a combined film thickness of the first layer of diamond and the second layer of diamond in the first set of diamond coatings.

3. The tool according to claim 1 ,
wherein the diamond coating of the first set of diamond coatings positioned closest to the base material includes a third layer containing no boron.

4. The tool according to claim 1 ,
wherein a film thickness of the first layer of diamond is less than 100% of a film thickness of the second layer of diamond in each diamond coating.

5. The tool according to claim 4 ,
wherein the film thickness of the first layer of diamond is 25% or more of the film thickness of the second layer of diamond in each diamond coating.

Assignees

• Osg Corp

Inventors

• Hanyu Hiroyuki
• Fukui Yasuo

Classifications

• B23B51/00 Primary

  Tools for drilling machines · CPC title

• B23P15/28

  cutting tools (sawing tools B23D63/00, B23D65/00; files or rasps B23D73/00) · CPC title

• B23B2228/105

  with specified thickness · CPC title

• B23B2226/31

  Diamond · CPC title

• C23C28/044 Primary

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