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Title:
DIAMOND POLYCRYSTAL AND TOOL PROVIDED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2020/017039
Kind Code:
A1
Abstract:
A diamond polycrystal having such a property that, in a Knoop hardness test carried out under conditions prescribed in JIS Z 2251:2009, the value of the ratio of a' to a, i.e., (a'/a), is 0.99 or less, wherein a represents the length of a longer one of diagonal lines in a first Knoop flaw which is formed on the surface of the diamond polycrystal when a Knoop indenter is pressed at a test load of 4.9 N against the surface of the diamond polycrystal, and a' represents the length of a longer one of diagonal lines in a second Knoop flaw which remains on the surface of the diamond polycrystal after the release of the test load from the diamond polycrystal.

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Inventors:
SUMIYA HITOSHI (JP)
YAMAMOTO KATSUKO (JP)
Application Number:
PCT/JP2018/027344
Publication Date:
January 23, 2020
Filing Date:
July 20, 2018
Export Citation:
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Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
C04B35/52; B23B27/14; B23B27/20; B23C5/16
Domestic Patent References:
WO2012023473A12012-02-23
WO2018066319A12018-04-12
Foreign References:
JP2014129218A2014-07-10
JP2015227278A2015-12-17
JP2003292397A2003-10-15
JP2015227278A2015-12-17
JP2018008875A2018-01-18
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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