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公开(公告)号：US20220081319A1
公开(公告)日：2022-03-17
申请号：US17419346
申请日：2020-02-04
发明人： Shin-ichi OHKOSHI , Asuka NAMAI , Marie YOSHIKIYO , Daisuke KODAMA , Shiho OBATA , Masahiro GOTOH
摘要： An iron-based oxide magnetic powder has good thermal stability and a small change in coercive force even in a high-temperature environment and is one composed of particles of ε-iron oxide in which Fe sites are partially substituted by another metal element. A production method for such an iron-based oxide magnetic powder includes allowing a phosphorus-containing ion to coexist when a precipitate of an iron hydroxide containing a substituent metal element produced by neutralizing an acidic aqueous solution containing a trivalent iron ion and an ion of a metal that partially substitutes Fe sites is coated with silicon oxide using a silane compound.
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公开(公告)号：US20210300779A1
公开(公告)日：2021-09-30
申请号：US16979241
申请日：2019-03-26
发明人： Shin-ichi OHKOSHI , Asuka NAMAI , Kenji SAKANE , Tetsuya KAWAHITO
摘要： [Problem] To provide a method for producing iron based oxide magnetic powder that has a narrow particle size distribution and a small content of fine particles that do not contribute to the magnetic recording characteristics, and consequently has a narrow coercive force distribution and is suitable for the enhancement of the recording density of the magnetic recording medium. [Solution] ε-Type iron based oxide magnetic powder is obtained by a wet method, then a tetraalkylammonium salt as a surface modifier is added to a slurry containing the magnetic powder to make a concentration of 0.009 mol/kg or more and 1.0 mol/kg or less, and simultaneously to make pH of 11 or more and 14 or less, and the slurry is subjected to a dispersion treatment and then classified, so as to provide iron based oxide magnetic powder having a narrow particle size distribution and a narrow coercive force distribution.
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3.发明申请公开(公告)号：US20210012936A1
公开(公告)日：2021-01-14
申请号：US16969839
申请日：2019-02-14
发明人： Shin-ichi OHKOSHI , Asuka NAMAI , Marie YOSHIKIYO , Masahiro GOTOH , Toshihiko UEYAMA , Takayuki YOSHIDA
摘要： There is provided a magnetic material that has an excellent electromagnetic wave absorption performance in a wide frequency range even under low temperature and high temperature environments and that ensures the absorption performance, and provided a magnetic material as a mixture of a magnetic material having positive slope of change in coercive force dependent on temperature, and a magnetic material having negative slope of change in coercive force dependent on temperature.
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4.发明申请公开(公告)号：US20180170767A1
公开(公告)日：2018-06-21
申请号：US15735410
申请日：2016-06-13
发明人： Shin-ichi OHKOSHI , Syunsuke OKA , Asuka NAMAI , Kenji MASADA
摘要： An epsilon iron oxide has an average particle size of 10 to 18 nm, a part of the iron element being substituted with a substitutional element and has a coercive force of 14 kOe or less, wherein a coefficient of variation of the particle size is 40% or less. A method for producing the same, a magnetic coating material and a magnetic recording medium using the epsilon iron oxide, includes depositing a metal compound of a substitutional element on iron oxide hydroxide to thereby obtain iron oxide hydroxide on which the metal compound is deposited; coating the iron oxide hydroxide on which the metal compound is deposited, with silicon oxide to thereby obtain iron oxide hydroxide coated with the silicon oxide; and applying heat treatment to the silicon oxide-coated iron oxide hydroxide in an oxidizing atmosphere, wherein a part of an iron element is substituted with the substitutional element.
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5.发明申请公开(公告)号：US20170349448A1
公开(公告)日：2017-12-07
申请号：US15544147
申请日：2016-01-18
发明人： Shin-ichi OHKOSHI , Hiroko TOKORO , Koji NAKABAYASHI , Asuka NAMAI , Kenta IMOTO , Kenji MASADA
摘要： There are provided an oriented body such as a magnetic sheet in which a value of degree of orientation of magnetic particles is beyond 3.5, and a method for producing the same, and a device for producing the same, wherein the oriented body such as a magnetic sheet is produced through the steps of: mixing a mixed solution containing a solvent and a vehicle and ε-iron oxide particles by shaking stirring, and dispersing the ε-iron oxide particles in the mixed solution; providing a mixed solution in which the ε-iron oxide particles are dispersed, on a predetermined substrate; and removing the solvent while applying a magnetic field to the substrate provided with the mixed solution, to obtain an oriented body.
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公开(公告)号：US20170137302A1
公开(公告)日：2017-05-18
申请号：US15318783
申请日：2015-06-18
发明人： Shin-ichi OHKOSHI , Marie YOSHIKIYO , Asuka NAMAI , Hiroko TOKORO , Waka TARORA , Tomomichi NASU , Takayuki YOSHIDA , Manabu TANAKA
CPC分类号： C01G49/06 , C01P2002/72 , C01P2002/77 , C01P2002/90 , C01P2006/42 , G11B5/706 , G11B5/714 , G11B5/84 , H01F1/11
摘要： A magnetic σ-form iron oxide nanopowder is a novel magnetic iron oxide nanopowder having magnetic polarization and spontaneous electric polarization and having physical properties similar to those of half-metals; and a process produces the magnetic nanopowder. The magnetic powder has a composition represented by Fe2O3 and has a crystal structure belonging to the monoclinic system.
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7.发明申请公开(公告)号：US20180366151A1
公开(公告)日：2018-12-20
申请号：US15780057
申请日：2016-11-30
发明人： Shin-ichi OHKOSHI , Kenta IMOTO , Shizuka ANAN , Asuka NAMAI , Kenji MASADA
摘要： There is provided an oriented body containing platinum group-substituted-6 iron oxide particles typified by Rh-substituted ϵ-iron oxide or Ru-substituted ϵ-iron oxide applicable to MAMR, MIMR, or F-MIMR system, and a technique related thereto, containing platinum group element-substituted ϵ-iron oxide particles in which a part of ϵ-iron oxide is substituted with at least one element of platinum group elements, as magnetic particles wherein the degree of orientation of the magnetic particles defined by the degree of orientation=SQ (direction of magnetization easy-axes)/SQ (direction of magnetization hard-axes) exceeds 5.0, and a coercive force exceeds 31 kOe.
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8.发明申请METHOD FOR IMPROVING COERCIVE FORCE OF EPSILON-TYPE IRON OXIDE, AND EPSILON-TYPE IRON OXIDE 审中-公开改善EPSILON型氧化铁和EPSILON型氧化铁的强化力的方法公开(公告)号：US20160343484A1
公开(公告)日：2016-11-24
申请号：US15231122
申请日：2016-08-08
发明人： Shin-ichi OHKOSHI , Shunsuke SAKURAI , Asuka NAMAI , Sayaka UMEDA , Hiroshi HACHIYA , Kazuyuki MATSUMOTO , Takashi GOTOH
CPC分类号： H01F1/047 , C01G49/0018 , C01G49/06 , C01P2002/50 , C01P2002/52 , C01P2006/42 , C04B35/26 , C04B35/62826 , C04B2235/3217 , C04B2235/3286 , C04B2235/3289 , C04B2235/3418 , C04B2235/761 , H01F1/10
摘要： An epsilon-type iron oxide having an Fe-site that is substituted with a platinum group element, provided that Fe of a D-site of the epsilon-type iron oxide is not substituted with the platinum group element.
摘要翻译： 具有被铂族元素取代的Fe部位的ε型氧化铁，只要ε型氧化铁的D位的Fe未被铂族元素取代。
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9.发明申请公开(公告)号：US20210227730A1
公开(公告)日：2021-07-22
申请号：US15734079
申请日：2019-05-30
摘要： A radio wave-absorbing laminate film in which both the top surface and the bottom surface have superior transmission attenuation properties and reflection attenuation capabilities in extremely high-frequency wave bands and higher, and which exhibits excellent radio wave absorption properties even when extremely thin; a production method for the film; and an element containing the film. A radio wave-absorbing laminate film having radio wave-absorbing layers, the radio wave-absorbing laminate film including a center layer, two substrate layers, and two radio wave-absorbing layers, the center layer containing at least one metal layer, and the two substrate layers being laminated on both surfaces of the center layer. With regard to each of the two substrate layers, the radio wave-absorbing layer is laminated on the surface opposite to the center layer, and, the two substrate layers are the same or different, the two radio wave-absorbing layers are the same or different, and at least one of the radio wave-absorbing layers contains a magnetic body.
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10.发明申请公开(公告)号：US20160237331A1
公开(公告)日：2016-08-18
申请号：US15026290
申请日：2014-10-06
发明人： Shin-ichi OHKOSHI , Hiroko TOKORO , Marie YOSHIKIYO , Asuka NAMAI
CPC分类号： C09K5/063 , C01G23/04 , C01P2002/72 , C01P2002/76 , C01P2002/77 , C01P2006/32 , C01P2006/36 , C09K5/02 , F28D20/0034 , F28D20/02 , Y02E60/142
摘要： A heat storage/dissipation material has a constitution in which heat storage/dissipation titanium oxide made of Ti3O5 is dispersed in heat transfer oil in a liquid form, the heat storage/dissipation titanium oxide not undergoing phase transition into a β-phase that has properties of a non-magnetic semiconductor and maintaining a state of a paramagnetic metal as long as the heat storage/dissipation titanium oxide is not subjected to pressure or light for heat dissipation. The heat storage/dissipation material is capable of maintaining a state of storing heat as long as the heat storage/dissipation material is not subjected to the pressure or the light for heat dissipation and is capable of releasing heat when subjected to the pressure or the light for heat dissipation, and therefore is capable of releasing the stored heat at a desired timing.
摘要翻译： 储热耗散材料具有将由Ti 3 O 5构成的储热·散发氧化钛以液体形式分散在传热油中的结构，不会进入相转变为具有性质的β相的储热/ 的非磁性半导体，并且保持顺磁性金属的状态，只要蓄热/耗散氧化钛不经受用于散热的压力或光。 只要蓄热/散热材料不受到压力或散热的光的影响，散热材料就能够保持蓄热状态，并且当受到压力或光线时能够释放热量 用于散热，因此能够在期望的时间释放所存储的热量。
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