Title:
DIAMOND POLYCRYSTAL BODY AND INDUSTRIAL TOOL EQUIPPED WITH THE SAME
Document Type and Number:
Japanese Patent JP2020011887
Kind Code:
A
Abstract:
To provide a diamond polycrystal body having excellent crack initiation resistance and high fracture toughness, while maintaining high hardness, and an industrial tool equipped with the same.SOLUTION: In a Vickers hardness test performed under a condition stipulated in JIS Z 2244:2009, if d is a length of a longer diagonal line of a first Vickers impression formed on a surface of a diamond polycrystal body in a state where a Vickers indenter of a test load 4.9 N is pushed into the surface of the diamond polycrystal body, and d' is a length of a longer diagonal line of a second Vickers impression remaining on the surface of the diamond polycrystal body after releasing the test load, a value of a ratio (d'/d) of the d' with regard to the d is 0.98 or less.SELECTED DRAWING: Figure 1
Inventors:
SUMIYA HITOSHI
YAMAMOTO KAZUKO
YAMAMOTO KAZUKO
Application Number:
JP2018187317A
Publication Date:
January 23, 2020
Filing Date:
October 02, 2018
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES
International Classes:
C04B35/52; B23B27/14; B23B27/20; B23C5/16; B24D3/00; C01B32/26
Attorney, Agent or Firm:
Fukami patent office