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公开(公告)号：US11421341B2
公开(公告)日：2022-08-23
申请号：US16329729
申请日：2018-07-20
发明人： Hitoshi Sumiya , Katsuko Yamamoto
摘要： In a diamond polycrystal, a value of a ratio (a′/a) of a′ to a is less than or equal to 0.99 in a Knoop hardness test performed under a condition defined in JIS Z 2251:2009, where the a represents a length of a longer diagonal line of a first Knoop indentation formed in a surface of the diamond polycrystal when a Knoop indenter with a test load of 4.9 N is pressed onto the surface of the diamond polycrystal, and the a′ represents a length of a longer diagonal line of a second Knoop indentation remaining in the surface of the diamond polycrystal after releasing the test load.
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公开(公告)号：US20180265416A1
公开(公告)日：2018-09-20
申请号：US15546431
申请日：2016-01-13
发明人： Yuh Ishida , Katsuko Yamamoto , Hitoshi Sumiya
IPC分类号： C04B35/5831 , B23B27/14 , C04B35/583 , C04B35/645
摘要： It is an object to provide a cubic boron nitride polycrystalline material excellent in toughness. A cubic boron nitride polycrystalline material containing fine cubic boron nitride which is granular, has a maximum grain size not greater than 100 nm, and has an average grain size not greater than 70 nm and at least one of plate-shaped cubic boron nitride in a form of a plate having an average major radius not smaller than 50 nm and not greater than 10000 nm and coarse cubic boron nitride which is granular, has a minimum grain size exceeding 100 nm, and has an average grain size not greater than 1000 nm is provided.
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公开(公告)号：US11041791B2
公开(公告)日：2021-06-22
申请号：US16306079
申请日：2018-03-29
发明人： Kensei Hamaki , Katsuko Yamamoto , Hitoshi Sumiya , Yuh Ishida
IPC分类号： G01N3/40 , G01N3/42 , C01B32/26 , C04B35/52 , C04B35/645
摘要： An indenter is made of polycrystalline diamond and has a tip having a spherical surface with a radius of 10 to 2000 μm.
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公开(公告)号：US10562776B2
公开(公告)日：2020-02-18
申请号：US15574744
申请日：2016-06-01
发明人： Katsuko Yamamoto , Keiko Arimoto , Hitoshi Sumiya
IPC分类号： C01B32/25 , B01J3/06 , B23B27/20 , B24B53/047 , C30B29/04
摘要： The present diamond single crystal is a diamond single crystal containing nitrogen atoms, in which a concentration of the nitrogen atoms changes periodically along a crystal orientation of the diamond single crystal, and an arithmetic average value Aave, a maximum value Amax, and a minimum value Amin of the distance of one period along the crystal orientation satisfy the relationship expressed by the following equation (I): (Amax)/1.25≤(Aave)≤(Amin)/0.75 (I).
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公开(公告)号：US10519068B2
公开(公告)日：2019-12-31
申请号：US15549783
申请日：2016-01-18
发明人： Yuh Ishida , Keiko Arimoto , Katsuko Yamamoto , Hitoshi Sumiya
IPC分类号： C04B35/5831 , B23B27/14 , B23B51/00 , B23C5/16 , B23B27/20 , C04B35/583 , C04B35/645
摘要： A cubic boron nitride polycrystal includes cubic boron nitride, the cubic boron nitride having an average grain size of not more than 150 nm, the cubic boron nitride polycrystal having a crack generation load of not less than 25 N in a breaking strength test in which an R200 μm diamond indenter is used to apply a load at a rate of 100 N/min.
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公开(公告)号：US20180141818A1
公开(公告)日：2018-05-24
申请号：US15574744
申请日：2016-06-01
发明人： Katsuko Yamamoto , Keiko Arimoto , Hitoshi Sumiya
IPC分类号： C01B32/25 , B01J3/06 , B23B27/20 , B24B53/047 , C30B29/04
摘要： The present diamond single crystal is a diamond single crystal containing nitrogen atoms, in which a concentration of the nitrogen atoms changes periodically along a crystal orientation of the diamond single crystal, and an arithmetic average value Aave, a maximum value Amax, and a minimum value Amin of the distance of one period along the crystal orientation satisfy the relationship expressed by the following equation (I): (Amax)/1.25≤(Aave)≤(Amin)/0.75 (I).
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公开(公告)号：US11858856B2
公开(公告)日：2024-01-02
申请号：US16346459
申请日：2017-11-29
IPC分类号： C04B35/52 , B01J3/06 , B23B27/20 , C04B41/87 , B23B27/14 , C01B32/25 , C23C16/26 , C01B32/205 , C30B29/04 , C04B35/528 , C25B11/043
CPC分类号： C04B35/52 , B01J3/06 , B01J3/062 , B23B27/14 , B23B27/20 , C01B32/205 , C01B32/25 , C04B35/528 , C04B41/87 , C23C16/26 , C25B11/043 , C30B29/04 , B01J2203/061 , B01J2203/0655 , C04B2235/421 , C04B2235/427 , C04B2235/781 , C04B2235/963
摘要： Provided is polycrystalline diamond having a diamond single phase as basic composition, in which the polycrystalline diamond includes a plurality of crystal grains and contains boron, hydrogen, oxygen, and the remainder including carbon and trace impurities; the boron is dispersed in the crystal grains at an atomic level, and greater than or equal to 90 atomic % of the boron is present in an isolated substitutional type; hydrogen and oxygen are present in an isolated substitutional type or an interstitial type in the crystal grains; each of the crystal grains has a grain size of less than or equal to 500 nm; and the polycrystalline diamond has a surface covered with a protective film.
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公开(公告)号：US11613826B2
公开(公告)日：2023-03-28
申请号：US16756553
申请日：2018-08-02
摘要： Provided is a synthetic single crystal diamond containing nitrogen atoms at a concentration of more than 600 ppm and 1500 ppm or less. The Raman shift λ′ (cm−1) of a peak in a primary Raman scattering spectrum of the synthetic single crystal diamond and the Raman shift λ (cm−1) of a peak in a primary Raman scattering spectrum of a synthetic type IIa single crystal diamond containing nitrogen atoms at a content of 1 ppm or less satisfy the following expression (1): λ′−λ≥−0.10 (1).
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公开(公告)号：US10562822B2
公开(公告)日：2020-02-18
申请号：US15546431
申请日：2016-01-13
发明人： Yuh Ishida , Katsuko Yamamoto , Hitoshi Sumiya
IPC分类号： C04B35/5831 , C04B35/583 , C04B35/645 , B23B27/14 , B23B27/20 , C01B21/064
摘要： It is an object to provide a cubic boron nitride polycrystalline material excellent in toughness. A cubic boron nitride polycrystalline material containing fine cubic boron nitride which is granular, has a maximum grain size not greater than 100 nm, and has an average grain size not greater than 70 nm and at least one of plate-shaped cubic boron nitride in a form of a plate having an average major radius not smaller than 50 nm and not greater than 10000 nm and coarse cubic boron nitride which is granular, has a minimum grain size exceeding 100 nm, and has an average grain size not greater than 1000 nm is provided.
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公开(公告)号：US09878914B2
公开(公告)日：2018-01-30
申请号：US15131971
申请日：2016-04-18
发明人： Kazuhiro Ikeda , Katsuko Yamamoto , Hitoshi Sumiya
CPC分类号： C01B32/25 , B01J3/062 , B01J2203/061 , B01J2203/0655
摘要： Nano polycrystalline diamond is composed of carbon and a plurality of impurities other than carbon. A concentration of each of the plurality of impurities is not higher than 0.01 mass %, and the nano polycrystalline diamond has a crystal grain size (a maximum length) not greater than 500 nm. The nano polycrystalline diamond can be fabricated by preparing graphite in which a concentration of an impurity is not higher than 0.01 mass % and converting graphite to diamond by applying an ultra-high pressure and a high temperature to graphite.
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