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Title:
POLYCRYSTALLINE CUBIC BORON NITRIDE AND PRODUCTION METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2019/244894
Kind Code:
A1
Abstract:
This polycrystalline cubic boron nitride contains 98.5% by volume or more cubic boron nitride. When a cross section of the polycrystalline cubic boron nitride is observed at a magnification of 10,000 times using a scanning electron microscope, the area ratio S1 of crystal particles having an equivalent circle diameter of 1 μm or greater is 20% by area or less.

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Inventors:
HIRANO TSUTOMU (JP)
KUKINO SATORU (JP)
Application Number:
PCT/JP2019/024120
Publication Date:
December 26, 2019
Filing Date:
June 18, 2019
Export Citation:
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Assignee:
SUMITOMO ELECTRIC HARDMETAL CORP (JP)
International Classes:
C04B35/5831; B23B27/14; B23P15/28; C01B21/064
Domestic Patent References:
WO2016129328A12016-08-18
WO2016125548A12016-08-11
Foreign References:
JP2014080323A2014-05-08
JPH11335175A1999-12-07
JPS4913209A1974-02-05
JPS5433510A1979-03-12
JP2018115432A2018-07-26
JPH11246271A1999-09-14
Other References:
SALLES VINCENT ET AL.: "Design of highly dense boron nitride by the combination of spray-pyrolysis of borazine and additive-free sintering of derived ultrafine powders", CHEMISTRY OF MATERIALS ARTICLE, vol. 21, 2009, pages 2920 - 2929, XP055666287
Attorney, Agent or Firm:
FUKAMI PATENT OFFICE, P.C. (JP)
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