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Title:
POLYCRYSTAL CUBIC CRYSTAL BORON NITRIDE AND TOOL
Document Type and Number:
WIPO Patent Application WO/2021/059700
Kind Code:
A1
Abstract:
The polycrystal cubic crystal boron nitride contains a cubic crystal boron nitride particle group. The ratio of a second length over a first length is 0.99 or less. Herein, each of the first length and the second length refers to a value measured on the surface of a polycrystal cubic crystal boron nitride whereon an indentation has been formed by a Knoop hardness test under the conditions defined in ISO 4545-1 and ISO 4545-4. The second length indicates the length of a diagonal line in the long direction of the indentation. The first length indicates the total of the second length and the length of a streak-like impression. The length of the streak-like impression is measured by observing the surface of the polycrystal cubic crystal boron nitride with a field emission type scanning electron microscope, at a magnification of between 5,000X and 10,000X inclusive. The second length is measured by observing the surface of the polycrystal cubic crystal boron nitride with a light microscope at a magnification of between 500X and 1,000X inclusive.

Inventors:
SUMIYA HITOSHI (JP)
ISHIDA YUH (JP)
Application Number:
PCT/JP2020/028038
Publication Date:
April 01, 2021
Filing Date:
July 20, 2020
Export Citation:
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Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
B23B27/14; B23B27/20; B23C5/16; C04B35/5831
Domestic Patent References:
WO2020017040A12020-01-23
Foreign References:
JP2019085329A2019-06-06
Other References:
ICHIDA YOSHIO ET AL.: "Synthesis of coarse-grain- dispersed nano-polycrystalline cubic boron nitride by direct transformation under ultrahigh pressure", DIAMOND & RELATED MATERIALS, vol. 77, 2017, pages 25 - 34, XP085139125, DOI: 10.1016/j.diamond.2017.04.020
ICHIDA YOSHIO ET AL.: "Synthesis of ultrafine nano- polycrystalline cubic boron nitride by direct transformation under ultrahigh pressure", JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, vol. 38, 2018, pages 2815 - 2822, XP085364969, DOI: 10.1016/j.jeurceramsoc.2018.02.023
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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