Granted Patent B2

US 12,533,736 · App. 17/773,226 · Granted Jan 27, 2026

Inventors: Rintaro Sugimoto (Hyogo, JP); Takashi Harada (Hyogo, JP); Minoru Yoshida (Hyogo, JP)

Assignee: SUMITOMO ELECTRIC HARDMETAL CORP.

B23C5/16B23C2228/10

Abstract

Claims (21)

1 . A diamond-coated tool provided with a blade which includes a base material and a diamond layer formed on the base material,

wherein a length of the blade along an extending direction thereof is denoted by L, and a thickness of the diamond layer of the blade is measured at a total number of 11 points which are arranged from one end of the blade along the extending direction thereof and separated from each other at an interval of L/10, the thickness being the same at all of the 11 points, or a ratio d min /d max between a minimum value d min of the thickness and a maximum value d max of the thickness being 0.7 or more and less than 1, and

wherein a Raman spectrum of the diamond layer in the range of Raman shift 900 cm −1 to 2000 cm −1 is measured at a first point where the thickness has a minimum value d min and a second point where the thickness has a maximum value d max ,

a ratio I min /I max between I min , which is a ratio Id min /Is min at the first point between a peak area intensity Id min of diamond and an area intensity Is min of the entire spectrum, and I max , which is a ratio Id max /Is max at the second point between a peak area intensity Id max of diamond and an area intensity Is max of the entire spectrum, is 0.7 or more and 1 or less.

2 . The diamond-coated tool according to claim 1 , wherein

the ratio d min /d max is 0.85 or more and less than 1.

3 . The diamond-coated tool according to claim 1 , wherein

a C1s spectrum of the diamond layer is measured by X-ray photoelectron spectroscopy at a first point where the thickness has a minimum value d min and a second point where the thickness has a maximum value d max ,

a ratio Ix min /Ix max between Ix min , which is a ratio I3 min /I2 min at the first point between a peak area intensity I3 min of sp3 carbon and a peak area intensity 12 min of sp2 carbon, and Ix max , which is a ratio I3 max /I2 max at the second point between a peak area intensity I3 max of sp3 carbon and a peak area intensity I2 max of sp2 carbon, is 0.7 or more and 1 or less.

4 . The diamond-coated tool according to claim 1 , wherein

an average particle diameter of the diamond layer is measured by electron backscatter diffraction at a first point where the thickness has a minimum value d min and a second point where the thickness has a maximum value d max ,

a ratio D min /D max between the average particle diameter D min at the first point and the average particle diameter D max at the second point is 0.7 or more and 1 or less.

5 . The diamond-coated tool according to claim 1 , wherein

a surface roughness Ra of the diamond layer is measured with a laser microscope at a first point where the thickness has a minimum value d min and a second point where the thickness has a maximum value d max ,

a ratio R min /R max between a surface roughness R min at the first point and a surface roughness R max at the second point is 0.7 or more and 1 or less.

6 . A method of manufacturing a diamond-coated tool according to claim 1 , the method comprising:

preparing a base material; and

forming a diamond layer on the base material by a hot filament CVD process to obtain a diamond-coated tool,

the hot filament CVD process being performed in such a manner that the temperature distribution in a blade of the base material where a cutting edge is formed is controlled within 5%.

7 . The diamond-coated tool according to claim 1 , wherein

the ratio d min /d max is 0.7 or more and less than 0.95.

Assignments (1)

Priority Claims (1)

Continuity (1)

References Cited (9)