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1.发明授权
公开(公告)号：US4851292A
公开(公告)日：1989-07-25
申请号：US8439
申请日：1987-01-29
申请人： Norimichi Nagai , Akihiko Hirayama , Norio Sugita , Masao Kiyama , Toshio Takada , Katsunori Fujimoto , Yasutaka Ota
发明人： Norimichi Nagai , Akihiko Hirayama , Norio Sugita , Masao Kiyama , Toshio Takada , Katsunori Fujimoto , Yasutaka Ota
IPC分类号： G11B5/706
CPC分类号： G11B5/70678 , Y10S428/90 , Y10T428/2982 , Y10T428/2991
摘要： Disclosed herein are plate-like barium ferrite particles with a solid solution of zinc on the surface thereof, which have an average particle diameter of not less than 0.03 .mu.m and less than 0.1 .mu.m, a BET specific surface are of 55 to 80 m.sup.2 /g, a coercive force of 300 to 1,500 Oe and a magnetization of not less than 57 emu/g, preferably not less than 60 emu/g, in magnetic field of 10 KOe, and which are represented by the following formula (I):BaO.n[(Fe.sub.1-x-y Co.sub.x Ti.sub.y).sub.2 O.sub.3-x+y ] (I)wherein x and y are independently from 0.02 to 0.12 and n is from 4 to 11, the atomic ratio of Co to Fe(III) being from 0.02:1 to 0.13:1 and the molar ratio of Ti to Co being from more than 0 to not more than 0.8, and a process for producing the plate-like barium ferrite particles.
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公开(公告)号：US4752407A
公开(公告)日：1988-06-21
申请号：US7760
申请日：1987-01-28
CPC分类号： B82Y30/00 , C01G49/009 , G11B5/70678 , H01F1/11 , C01P2002/32 , C01P2004/04 , C01P2004/20 , C01P2004/64 , C01P2006/12 , C01P2006/42
摘要： Disclosed herein are plate-like barium particles which are suitable for use in precursor of sintered magnets and magnetic recording media, which have an average particle diameter of not less than 0.03 .mu.m and less than 0.1 .mu.m, and which are represented by the following formula (I):BaO.n[Fe.sub.1-x-y Co.sub.x Ti.sub.y).sub.2 O.sub.3-x+y ] (i)wherein x and y are independently from 0.02 to 0.12 and n is from 4 to 7, the atomic ratio of Co to Fe(III) being from 0.02:1 to 0.13:1 and the molar ratio of Ti to Co being from more than 0 to not more than 0.8, and a process for producing the plate-like barium ferrite particles.
摘要翻译： 本文公开了适用于平均粒径不小于0.03μm且小于0.1μm的烧结磁体和磁记录介质的前体的板状钡颗粒，并且由以下 式（I）：BaO.n [Fe1-x-yCoxTiy] 2O3-x + y]（i）其中x和y独立地为0.02〜0.12，n为4〜7，Co与Fe的原子比（ III）为0.02:1至0.13:1，Ti与Co的摩尔比大于0至不大于0.8，以及制备板状钡铁氧体颗粒的方法。
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3.发明授权
公开(公告)号：US4806429A
公开(公告)日：1989-02-21
申请号：US8466
申请日：1987-01-29
申请人： Norimichi Nagai , Akihiko Hirayama , Norio Sugita , Masao Kiyama , Toshio Takada , Katsunori Fujimoto , Yasutaka Ota
发明人： Norimichi Nagai , Akihiko Hirayama , Norio Sugita , Masao Kiyama , Toshio Takada , Katsunori Fujimoto , Yasutaka Ota
CPC分类号： G11B5/70678 , Y10S428/90 , Y10T428/2982 , Y10T428/2991
摘要： Disclosed herein are plate-like barium ferrite particles with a solid solution of zinc on the surface thereof, which have an average particle diameter of 0.05 to 0.3 .mu.m, a coercive force of 300 to 1,500 Oe and a magnetization of not less than 55 emu/g in magnetic field of 10 KOe, and which are represented by the following formula (I):BaO.multidot.n[(Fe.sub.1-2x Co.sub.x Ti.sub.x).sub.2 O.sub.3 ](I)wherein x is 0 to 0.1 and n is from 4 to 11, the molar ratio of Ti to Co being 1, and a process for producing the plate-like barium ferrite particles.
摘要翻译： 本文公开了具有锌表面固溶体的板状钡铁氧体颗粒，其平均粒径为0.05〜0.3μm，矫顽力为300〜1500Oe，磁化强度为55emu以上 （I）表示：BaOxn [（Fe1-2xCoxTix）2O3]（I）其中x为0〜0.1，n为4〜11，摩尔比 的Ti至Co为1，以及制备板状钡铁氧体颗粒的方法。
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4.发明授权Plate-like magnetoplumbite ferrite particles for magnetic recording and process for producing the same 失效用于磁记录的板状磁铅石铁氧体颗粒及其制造方法
公开(公告)号：US4781981A
公开(公告)日：1988-11-01
申请号：US129628
申请日：1987-12-07
申请人： Tsutomu Katamoto , Norimichi Nagai , Yasutaka Ota , Katsunori Fujimoto , Akihiko Hirayama , Masao Kiyama
发明人： Tsutomu Katamoto , Norimichi Nagai , Yasutaka Ota , Katsunori Fujimoto , Akihiko Hirayama , Masao Kiyama
CPC分类号： G11B5/70678 , Y10T428/2991
摘要： Disclosed herein are Ba-containing plate-like magnetoplumbite type ferrite particles for magnetic recording containing ions of one metal (II) selected from Ni and Zn and ions of one metal (IV) selected from Ti, Sn and Zr, and having zinc incorporated as a solid solution close to the particle surface and the change of coercive force of said particles at a temperature of -20.degree. to 120.degree. C. in the range of -0.5 to +0.5 Oe/.degree.C., and a process for producing the same.
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公开(公告)号：US5466306A
公开(公告)日：1995-11-14
申请号：US118287
申请日：1993-09-09
申请人： Akio Mishima , Tosiharu Harada , Mamoru Tanihara , Yasutaka Ota , Kenji Okinaka , Kohji Mori , Hirofumi Kawasaki , Norimichi Nagai , Katsunori Fujimoto , Yoshiro Okuda
发明人： Akio Mishima , Tosiharu Harada , Mamoru Tanihara , Yasutaka Ota , Kenji Okinaka , Kohji Mori , Hirofumi Kawasaki , Norimichi Nagai , Katsunori Fujimoto , Yoshiro Okuda
CPC分类号： G11B5/70621 , G11B5/70615 , G11B5/714 , H01F1/061
摘要： Disclosed herein are spindle-shaped magnetic iron based alloy particles containing at least one selected from the group consisting of Ni, Al, Si, P, Co, Mg, B and Zn, which have a particle length of 0.05 to 0.40 .mu.m, a crystallite size of 110 to 180 .ANG., a specific surface area of 30 to 60 m.sup.2 /g, a coercive force of 1,300 to 1,700 Oe and a saturation magnetization (.sigma.s) of not less than 100 emu/g and a process for producing the same.
摘要翻译： 本文公开了含有选自Ni，Al，Si，P，Co，Mg，B和Zn中的至少一种的锭状磁铁基合金粒子，其粒径为0.05〜0.40μm，a 微晶尺寸为110〜180，比表面积为30〜60m2 / g，矫顽力为1300〜1700Oe，饱和磁化强度（sigma）为100emu / g以上， 相同。
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6.发明授权
公开(公告)号：US5599378A
公开(公告)日：1997-02-04
申请号：US450205
申请日：1995-05-25
申请人： Akio Mishima , Tosiharu Harada , Mamoru Tanihara , Yasutaka Ota , Kenji Okinaka , Kohji Mori , Hirofumi Kawasaki , Norimichi Nagai , Katsunori Fujimoto , Yoshiro Okuda
发明人： Akio Mishima , Tosiharu Harada , Mamoru Tanihara , Yasutaka Ota , Kenji Okinaka , Kohji Mori , Hirofumi Kawasaki , Norimichi Nagai , Katsunori Fujimoto , Yoshiro Okuda
CPC分类号： G11B5/70621 , G11B5/70615 , G11B5/714 , H01F1/061
摘要： Disclosed herein are spindle-shaped magnetic iron based alloy particles containing at least one selected from the group consisting of Ni, Al, Si, P, Co, Mg, B and Zn, which have a particle length of 0.05 to 0.40 .mu.m, a crystallite size of 110 to 180 .ANG., a specific surface area of 30 to 60 m.sup.2 /g, a coercive force of 1,300 to 1,700 Oe and a saturation magnetization (.sigma.s) of not less than 100 emu/g and a process for producing the same.
摘要翻译： 本文公开了含有选自Ni，Al，Si，P，Co，Mg，B和Zn中的至少一种的锭状磁铁基合金粒子，其粒径为0.05〜0.40μm，a 微晶尺寸为110〜180，比表面积为30〜60m2 / g，矫顽力为1300〜1700Oe，饱和磁化强度（sigma）为100emu / g以上， 相同。
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7.发明授权Plate-like barium ferrite particles for magnetic recording and process for producing the same 失效用于磁记录的板状钡铁氧体颗粒及其制造方法
公开(公告)号：US4585568A
公开(公告)日：1986-04-29
申请号：US589350
申请日：1984-03-14
申请人： Norimichi Nagai , Nanao Horiishi , Masao Kiyama , Toshio Takada
发明人： Norimichi Nagai , Nanao Horiishi , Masao Kiyama , Toshio Takada
CPC分类号： G11B5/70678
摘要： Disclosed herein are plate-like barium ferrite particles having BET specific surface area of 20 to 70 m.sup.2 /g and average particle diameter of 0.05 to 0.3 .mu.m, and showing a magnetization of higher than 30 emu/g in a field of 10 kOe and coercive force of 300 to 1,000 Oe, represented by the formula BaCo.sub.x Ti.sub.x Fe.sub.12-2x O.sub.19 wherein x is 0.1 to 0.5, and a process for producing the same.
摘要翻译： 本发明公开了BET比表面积为20〜70m2 / g，平均粒径为0.05〜0.3μm的板状钡铁氧体颗粒，在10kOe的磁场中表现出高于30emu / g的磁化强度， 其矫顽力为300〜1000Oe，由式BaCoxTixFe12-2xO19表示，其中x为0.1〜0.5，及其制造方法。
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8.发明授权Process for production of plate-like barium ferrite particles for magnetic recording 失效用于磁记录的板状钡铁氧体颗粒的生产方法
公开(公告)号：US4561988A
公开(公告)日：1985-12-31
申请号：US666337
申请日：1984-10-30
申请人： Norimichi Nagai , Nanao Horiishi , Masao Kiyama , Toshio Takada
发明人： Norimichi Nagai , Nanao Horiishi , Masao Kiyama , Toshio Takada
IPC分类号： C01G49/02 , C01G23/00 , C01G49/00 , C01G51/00 , C01G53/00 , C04B35/00 , G11B5/706 , G11B5/84 , H01F1/11 , C04B35/26
CPC分类号： B82Y30/00 , C01G49/0036 , C01G49/0063 , C01G49/0072 , C01G49/009 , C01G51/006 , C01G53/006 , G11B5/70678 , H01F1/11 , C01P2002/32 , C01P2002/54 , C01P2004/20 , C01P2004/64 , C01P2006/11 , C01P2006/12 , C01P2006/42 , C01P2006/60
摘要： Disclosed herein is a process for producing the plate-like barium ferrite particles represented by the formula (I):BaFe.sub.12-x-y M.sub.x Ti.sub.y O.sub.19 (I)wherein x and y are respectively 0.3 to 1.2 and M is a divalent metal selected from the group consisting of Co, Ni, Zn and Mn, which comprises autoclaving an aqueous highly alkaline suspension containing spinel particles represented by the formula: Fe.sub.12-x-y M.sub.x Ti.sub.y O.sub.16, wherein x, y and M are respectively the same as defined above, having an average particle size of less than 0.1 .mu.m and Ba ions at a temperature of 250.degree. to 330.degree. C., the atomic ratio of Ba to total amount of the metals being in a range from 1:8 to 1:10.
摘要翻译： 本文公开了一种制备由式（I）表示的板状钡铁氧体颗粒的方法：BaFe12-x-yMxTiyO19（I）其中x和y分别为0.3至1.2，M为选自以下的二价金属： Co，Ni，Zn和Mn，其包括高压灭菌含有由式：Fe12-x-yMxTiyO16表示的尖晶石颗粒的水性高碱性悬浮液，其中x，y和M分别与上述相同，具有平均粒径 小于0.1μm的Ba离子和Ba离子在250〜330℃的温度下，Ba与金属的总量的原子比在1:8〜1:10的范围内。
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9.发明授权Hexagonal plate-like barium ferrite particles for magnetic recording and process for producing the same 失效用于磁记录的六角板状钡铁氧体颗粒及其制造方法
公开(公告)号：US4698182A
公开(公告)日：1987-10-06
申请号：US654194
申请日：1984-09-24
申请人： Norimichi Nagai , Nanao Horiishi , Masao Kiyama , Toshio Takada
发明人： Norimichi Nagai , Nanao Horiishi , Masao Kiyama , Toshio Takada
IPC分类号： C01G49/02 , C01G49/00 , C09D5/23 , C09D7/12 , G11B5/706 , G11B5/708 , G11B5/714 , H01F1/11 , C04B35/26
CPC分类号： G11B5/714 , G11B5/70678
摘要： Disclosed herein are hexagonal plate-like barium ferrite particles for magnetic recording, represented by the formula: BaFe.sub.12-x-y M.sub.x Ti.sub.y O.sub.19 wherein x and y are independently 0.6 to 1.2 and M is Co(II) or Co(II) and a divalent metal other than Co, having the width of the particle of 0.1 to 0.4 micrometer and a BET specific surface area (S) of 20 to 50 m.sup.2 /g, and showing a magnetization (M) of larger than 40 emu/g in a magnetic field of 10 KOe and a coercive force (Hc) of 500 to 1000 Oe, and a process for producing the same.
摘要翻译： 本文公开了用于磁记录的六角形板状钡铁氧体颗粒，其由下式表示：BaFe12-x-yMxTiyO19，其中x和y独立地为0.6至1.2，M为Co（II）或Co（II）和二价金属其他 比Co的宽度为0.1〜0.4微米，BET比表面积（S）为20〜50m 2 / g，在磁场中的磁化强度（M）大于40emu / g 10KOe和500〜1000Oe的矫顽力（Hc）及其制造方法。
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10.发明授权Plate-like barium ferrite particles for magnetic recording and process for producing the same 失效用于磁记录的板状钡铁氧体颗粒及其制造方法
公开(公告)号：US4584242A
公开(公告)日：1986-04-22
申请号：US738471
申请日：1985-05-28
申请人： Norimichi Nagai , Norio Sugita , Nanao Horiishi , Masao Kiyama , Toshio Takada
发明人： Norimichi Nagai , Norio Sugita , Nanao Horiishi , Masao Kiyama , Toshio Takada
CPC分类号： B82Y30/00 , C01G49/0036 , C01G49/009 , C01G51/006 , G11B5/70678 , C01P2002/54 , C01P2002/72 , C01P2004/20 , C01P2004/62 , C01P2004/64 , C01P2004/80 , C01P2006/12 , C01P2006/42 , C01P2006/60 , Y10S428/90 , Y10T428/2991
摘要： Disclosed herein are plate-like barium ferrite particles for magnetic recording, comprising plate-like particles represented by the formula:BaFe.sub.12-2x M.sub.x Ti.sub.x O.sub.19wherein x is 0 to 1.2 and M represents Co (II) or Co (II) and a divalent metal ion other than Co (II), the surface of the plate-like particles being modified with magnetite represented by the formula:FeO.sub.y.Fe.sub.2 O.sub.3wherein y is over 0 and not more than 1, and a process for producing the same.
摘要翻译： 本文公开了用于磁记录的板状钡铁氧体颗粒，其包含由下式表示的板状颗粒：BaFe12-2xMxTixO19，其中x为0至1.2，M表示Co（II）或Co（II）和其他二价金属离子 与Co（II）相比，其中y大于0且不大于1的由FeOy.Fe 2 O 3表示的磁铁矿改性的板状颗粒的表面及其制备方法。
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