POLYCRYSTALLINE DIAMOND METHOD FOR PRODUCING SAME, SCRIBE TOOL, SCRIBE WHEEL, DRESSER, ROTATING IMPLEMENT, WIRE DRAWING DIE, CUTTING IMPLEMENT, ELECTRODE, AND PROCESSING METHOD IN WHICH POLYCRYSTALLINE DIAMOND IS USED

WIPO Patent Application WO/2018/101346

A1

In the present invention, a diamond single phase is used as the basic structure in a polycrystalline diamond. The polycrystalline diamond comprises a plurality of crystal grains, and contains boron, hydrogen, and oxygen, the remainder comprising carbon and trace impurities. The boron disperses in the crystal grains at the atomic level and at least 90 atom% thereof is present in an isolated substitutional form. The hydrogen and the oxygen are present in the crystal grains as isolated substitutional or interstitial atoms. The crystal grains have a diameter of 500 nm or less, and the surface of the polycrystalline diamond is covered by a protective film.

IKEDA KAZUHIRO (JP)
ARIMOTO KEIKO (JP)
YAMAMOTO KATSUKO (JP)
SUMIYA HITOSHI (JP)

PCT/JP2017/042856

June 07, 2018

November 29, 2017

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SUMITOMO ELECTRIC INDUSTRIES (JP)

C01B32/25; B01J3/06; B23B27/14; B23B27/20; C01B32/205; C04B35/528; C04B41/87; C23C16/26; C25B11/12; C30B29/04

JP2013028500A	2013-02-07
JPH07299467A	1995-11-14
JP2013028495A	2013-02-07
JPH038795A	1991-01-16

TACHIBANA, T. ET AL.: "Growth of polycrystalline diamond films including diborane and oxygen in the source gas", JOURNAL OF THE ELECTROCHEMICAL SOCIETY, vol. 146, no. 5, 26 August 1999 (1999-08-26), pages 1996 - 1999, XP055509716
See also references of EP 3549912A4

FUKAMI PATENT OFFICE, P.C. (JP)

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