利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

12 条记录 (耗时 0.025 秒)

    Spindle-shaped magnetic alloy particles for magnetic recording, and magnetic recording medium
    1.
    发明授权
    Spindle-shaped magnetic alloy particles for magnetic recording, and magnetic recording medium 失效
    用于磁记录的主轴形磁性合金颗粒和磁记录介质

    公开(公告)号：US06753084B2

    公开(公告)日：2004-06-22

    申请号：US10022801

    申请日：2001-12-20

    申请人： Masaaki Maekawa ,  Haruki Kurokawa ,  Kenji Okinaka ,  Akinori Yamamoto ,  Yasutaka Ota

    发明人： Masaaki Maekawa ,  Haruki Kurokawa ,  Kenji Okinaka ,  Akinori Yamamoto ,  Yasutaka Ota

    IPC分类号： B32B516

    CPC分类号： G11B5/70621 ,  Y10S428/90

    摘要： Spindle-shaped magnetic alloy particles containing Fe and Co as main components of the present invention have a cobalt content of 20 to 50 atm % (calculated as Co) based on whole Fe; an average major axis diameter (L) of 0.03 to 0.10 &mgr;m; a coercive force value of 159.2 to 238.7 kA/m (2,000 to 3,000 Oe); a crystallite size of 100 to 160 Å; and an activation volume (Vact) of 0.01 to 0.07E-4 &mgr;m3. A high-density magnetic recording medium produced by using such spindle-shaped magnetic alloy particles containing Fe and Co as main components, have an excellent output characteristics in a short wavelength region, a considerably reduced noise and an excellent storage stability.

    摘要翻译： 含有Fe和Co作为本发明主要成分的锭状磁性合金颗粒的钴含量基于Fe的总和为20〜50atm％（以Co计）。 平均长轴直径（L）为0.03〜0.10μm; 矫顽力值为159.2〜238.7kA / m（2,000〜3,000Oe）; 微晶尺寸为100至160埃; 和活性体积（Vact）为0.01〜0.07E-4mum 3。 通过使用含有Fe和Co作为主要成分的纺锤形磁性合金粒子制造的高密度磁记录介质，在短波长区域具有优异的输出特性，噪音明显降低，存储稳定性优异。

    Magnetic metal particles containing iron as main component, process for producing the same and magnetic recording medium using the same
    2.
    发明授权
    Magnetic metal particles containing iron as main component, process for producing the same and magnetic recording medium using the same 失效
    含有铁作为主要成分的磁性金属颗粒，其制造方法和使用其的磁性记录介质

    公开(公告)号：US07172642B2

    公开(公告)日：2007-02-06

    申请号：US10305353

    申请日：2002-11-27

    申请人： Akinori Yamamoto ,  Yasutaka Ota ,  Haruki Kurokawa ,  Masaaki Maekawa

    发明人： Akinori Yamamoto ,  Yasutaka Ota ,  Haruki Kurokawa ,  Masaaki Maekawa

    IPC分类号： B22F1/00 ,  B22F9/20 ,  H01F1/16

    CPC分类号： H01F1/0551 ,  G11B5/70621 ,  Y10T428/325

    摘要： Magnetic metal particles containing iron as a main component, comprising cobalt in an amount of usually 20 to 50 atm %, calculated as Co, based on whole Fe, aluminum in an amount of usually 3 to 15 atm %, calculated as Al, based on whole Fe and a rare earth element in an amount of usually 3 to 20 atm %, calculated as rare earth element, based on whole Fe, and having an average major axis diameter of usually 0.02 to 0.065 μm, preferably from 0.02 to less than 0.05 μm, a coercive force of usually 159.2 to 222.9 kA/m (2,000 to 2,800 Oe), a soluble Na content of usually not more than 30 ppm, a soluble Ca content of usually not more than 100 ppm, and an oxidation stability Δσs of usually not more than 10%.

    摘要翻译： 以铁为主要成分的磁性金属颗粒，其含量通常为20〜50atm％，以Co为基准，以Fe为基准，以Al计，通常为3〜15atm％ 整个Fe和稀土元素，通常为3〜20atm％，以稀土元素计，以Fe为基准，平均长轴直径通常为0.02〜0.065μm，优选为0.02〜0.05wt％ 妈妈，通常为159.2〜222.9kA / m（2,000〜2,800Oe）的矫顽力，通常不超过30ppm的可溶性Na含量，通常不大于100ppm的可溶性Ca含量，以及氧化稳定性Deltasigmas 通常不超过10％。

    Fine barium titanate particles
    4.
    发明授权
    Fine barium titanate particles 有权
    精细的钛酸钡颗粒

    公开(公告)号：US07871595B2

    公开(公告)日：2011-01-18

    申请号：US11581061

    申请日：2006-10-16

    申请人： Haruki Kurokawa ,  Koichiro Kanda ,  Ryuji Fujita ,  Yuji Mishima ,  Seiji Okazaki ,  Hidetomo Unemoto

    发明人： Haruki Kurokawa ,  Koichiro Kanda ,  Ryuji Fujita ,  Yuji Mishima ,  Seiji Okazaki ,  Hidetomo Unemoto

    IPC分类号： C01G23/00 ,  C01F11/02

    CPC分类号： C01G23/006 ,  B82Y30/00 ,  C01P2004/12 ,  C01P2004/54 ,  C01P2004/64 ,  C01P2006/12

    摘要： The fine barium titanate particles of the present invention have an average primary particle diameter of from 10 nm to less than 20 nm, a sphericity of 1.00 to 1.18, and a ratio of an average secondary particle diameter to the average primary particle diameter of 0.7 to 6.0. The fine barium titanate particles of the present invention can exhibit a small behavior particle diameter and can be readily monodispersed notwithstanding very fine particles, and as a result, can be suitably used as various dielectric materials because the particles are free from aggregation therebetween and have an excellent dispersibility.

    摘要翻译： 本发明的细钛酸钡粒子的平均一次粒径为10nm〜小于20nm，球形度为1.00〜1.18，平均二次粒径与平均一次粒径的比例为0.7〜 6.0。 本发明的细小的钛酸钡颗粒可以表现出小的粒径，并且即使具有非常细的颗粒也可以容易地单分散，结果可以适当地用作各种介电材料，因为颗粒之间没有聚集，并且具有 分散性好。

    Process for producing acicular goethite particles and acicular magnetic iron oxide particles
    5.
    发明授权
    Process for producing acicular goethite particles and acicular magnetic iron oxide particles 失效
    制备针状针铁矿颗粒和针状磁性氧化铁颗粒的方法

    公开(公告)号：US5399278A

    公开(公告)日：1995-03-21

    申请号：US22844

    申请日：1993-02-25

    申请人： Katsumi Yamashita ,  Tosiharu Harada ,  Haruki Kurokawa ,  Kazuhisa Inaba ,  Hideaki Sadamura ,  Tomohisa Moriya ,  Junichi Kawano

    发明人： Katsumi Yamashita ,  Tosiharu Harada ,  Haruki Kurokawa ,  Kazuhisa Inaba ,  Hideaki Sadamura ,  Tomohisa Moriya ,  Junichi Kawano

    IPC分类号： C01G49/00 ,  C01G49/06 ,  C01G49/08 ,  G11B5/706 ,  H01F1/11

    CPC分类号： G11B5/70642 ,  B82Y30/00 ,  C01G49/06 ,  C01G49/08 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/51 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/42

    摘要： Disclosed herein are a process for producing acicular goethite particles comprising the steps of: blowing an oxygen-containing gas into a ferrous salt reaction solution containing colloidal ferrous hydroxide or iron-containing colloidal precipitates which is obtained by reacting an aqueous ferrous salt solution with less than one equivalent of an aqueous alkali hydroxide solution and/or an aqueous alkali carbonate solution based on Fe.sup.2 + in said aqueous ferrous salt solution so as to oxidize said colloidal ferrous hydroxide or iron-containing colloidal precipitates and to produce acicular goethite nucleus particles, adding to the resultant aqueous ferrous salt reaction solution containing said acicular goethite nucleus particles not less than one equivalent of an aqueous alkali carbonate solution based on Fe.sup.2 + in said aqueous ferrous salt reaction solution, and blowing an oxygen-containing gas into the mixed aqueous ferrous salt reaction solution so as to grow said goethite nucleus particles; and a process for producing acicular magnetic iron oxide particles by reducing the acicular goethite particles obtained in the above process to produce acicular magnetite particles, and if necessary, oxidizing the acicular magnetite particles to obtain acicular maghemite particles, and if necessary, modifying the acicular magnetite or maghemite particles with Co or Co and Fe.sup.2 +.

    摘要翻译： 本文公开了一种制备针状针铁矿颗粒的方法，包括以下步骤：将含氧气体吹入含有胶态氢氧化亚铁或含铁胶体沉淀物的亚铁盐反应溶液中，该溶液通过使亚铁盐水溶液与小于 1当量碱金属氢氧化物水溶液和/或基于Fe2 +的碱金属碳酸盐水溶液，在所述含水亚铁盐水溶液中氧化所述胶态氢氧化亚铁或含铁胶体沉淀物，并生成针状针铁矿颗粒，加入到 得到含有所述针状针铁矿颗粒的所述含水亚铁盐反应溶液，其含量不低于所述含水亚铁盐反应溶液中基于Fe2 +的碱金属碳酸盐水溶液的1当量，并将含氧气体吹入混合的含水亚铁盐溶液中， 成长为针铁矿核心部分 粒子 以及通过将上述方法中得到的针状针铁矿粒子还原而制造针状磁性氧化铁粒子的方法，制造针状磁铁矿粒子，根据需要，根据需要氧化针状磁铁矿粒子，得到针状磁赤铁矿粒子，根据需要，对针状磁铁矿 或具有Co或Co和Fe2 +的磁赤铁矿颗粒。

    Spindle-shaped goethite particles, spindle-shaped hematite particles and spindle-shaped magnetic iron based alloy particles
    8.
    发明授权
    Spindle-shaped goethite particles, spindle-shaped hematite particles and spindle-shaped magnetic iron based alloy particles 失效
    锭状针铁矿颗粒，梭形赤铁矿颗粒和纺锤形磁铁基合金颗粒

    公开(公告)号：US06183868B2

    公开(公告)日：2001-02-06

    申请号：US09394407

    申请日：1999-09-13

    申请人： Haruki Kurokawa ,  Kohji Mori

    发明人： Haruki Kurokawa ,  Kohji Mori

    IPC分类号： B32B516

    CPC分类号： B82Y30/00 ,  C01G49/06 ,  C01P2002/52 ,  C01P2002/60 ,  C01P2002/74 ,  C01P2004/03 ,  C01P2004/10 ,  C01P2004/52 ,  C01P2004/54 ,  C01P2004/62 ,  C01P2004/64 ,  C01P2006/12 ,  C01P2006/42 ,  G11B5/70621 ,  G11B5/70642 ,  Y10T428/2991

    摘要： The present invention relates to spindle-shaped goethite particles and spindle-shaped hematite particles, which have a narrow particle size distribution, include no dendrites, and have an appropriate particle shape and a large aspect ratio (major axial diameter/minor axial diameter); and spindle-shaped magnetic iron based alloy particles which are obtained from the spindle-shaped goethite particle or spindle-shaped hematite particles as a beginning material and which have a high coercive force and an excellent coercive force distribution. Such spindle-shaped goethite particles comprises: goethite seed containing 0.5 to 25 atm % of Co based on the total Fe in the spindle-shaped goethite particles, and goethite surface layer containing 0.5 to 15 atm % of Al based on the total Fe in the spindle-shaped goethite particles; and having an average major axial diameter of 0.05 to 1.0 &mgr;m.

    摘要翻译： 本发明涉及具有窄粒度分布的纺锤状针铁矿颗粒和纺锤状赤铁矿颗粒，不包括树突，并且具有适当的颗粒形状和大的纵横比（主轴向直径/小轴向直径）; 以梭心状的针铁矿粒子或纺锤状的赤铁矿粒子为起始原料得到的矫顽力高，矫顽力分布优异的纺锤状的铁基合金粒子。 这种纺锤状针铁矿颗粒包含：基于纺锤状针铁矿颗粒中的总Fe含有0.5〜25atm％的Co的针铁矿种子，以及含有0.5〜15atm％的Al的针铁矿表层， 梭形针铁矿颗粒; 平均主轴径为0.05〜1.0μm。

    Fine barium titanate particles
    9.
    发明申请
    Fine barium titanate particles 有权
    精细的钛酸钡颗粒

    公开(公告)号：US20070086941A1

    公开(公告)日：2007-04-19

    申请号：US11581061

    申请日：2006-10-16

    申请人： Haruki Kurokawa ,  Koichiro Kanda ,  Ryuji Fujita ,  Yuji Mishima ,  Seiji Okazaki ,  Hidetomo Unemoto

    发明人： Haruki Kurokawa ,  Koichiro Kanda ,  Ryuji Fujita ,  Yuji Mishima ,  Seiji Okazaki ,  Hidetomo Unemoto

    IPC分类号： C01G23/04

    CPC分类号： C01G23/006 ,  B82Y30/00 ,  C01P2004/12 ,  C01P2004/54 ,  C01P2004/64 ,  C01P2006/12

    摘要： The fine barium titanate particles of the present invention have an average primary particle diameter of from 10 nm to less than 20 nm, a sphericity of 1.00 to 1.18, and a ratio of an average secondary particle diameter to the average primary particle diameter of 0.7 to 6.0. The fine barium titanate particles of the present invention can exhibit a small behavior particle diameter and can be readily monodispersed notwithstanding very fine particles, and as a result, can be suitably used as various dielectric materials because the particles are free from aggregation therebetween and have an excellent dispersibility.

    摘要翻译： 本发明的细钛酸钡粒子的平均一次粒径为10nm〜小于20nm，球形度为1.00〜1.18，平均二次粒径与平均一次粒径的比例为0.7〜 6.0。 本发明的细小的钛酸钡颗粒可以表现出小的粒径，并且即使具有非常细的颗粒也可以容易地单分散，结果可以适当地用作各种介电材料，因为颗粒之间没有聚集，并且具有 分散性好。