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1. 发明授权

US4437881A Acicular ferromagnetic alloy particles and process for producing said particles 失效
标题翻译：针状铁磁合金颗粒及其制备方法
公开(公告)号：US4437881A
公开(公告)日：1984-03-20
申请号：US513866
申请日：1983-07-14
申请人： Akio Mishima , Yoshiro Okuda , Tosiharu Harada , Akira Mukaizaka , Tomoyuki Imai
发明人： Akio Mishima , Yoshiro Okuda , Tosiharu Harada , Akira Mukaizaka , Tomoyuki Imai
IPC分类号： G11B5/706 , B22F9/22
CPC分类号： G11B5/70615
摘要： Acicular ferromagnetic alloy particles doped with silicon, chromium and nickel and optionally magnesium and a process for producing said particles comprising heating at 300.degree. to 500.degree. C. under reducing atmosphere acicular particles of .alpha.-iron(III) oxide hydroxide doped with silicon, chromium and nickel and optionally magnesium or acicular particles of .alpha.-ferric oxide doped with silicon, chromium and nickel and optionally magnesium obtained by dehydrating the acicular particles of .alpha.-iron(III) oxide hydroxide doped with silicon, chromium and nickel and optionally magnesium are disclosed herein.
摘要翻译：掺杂有硅，铬和镍以及任选的镁的针状铁磁性合金颗粒和一种制备所述颗粒的方法，包括在还原性气氛下在300℃至500℃下加热掺杂有硅，铬（III）的α-铁氧化物氢氧化物的针状颗粒公开了镍和任选的掺有硅，铬和镍的α-氧化铁的镁或针状颗粒和任选的镁，其通过使掺杂有硅，铬和镍以及任选的镁的α-铁（III）氧化物氢氧化物的针状颗粒脱水获得，这里。

2. 发明授权

US4514216A Acicular ferromagnetic alloy particles for magnetic recording and process for producing the same 失效
标题翻译：用于磁记录的针状铁磁合金颗粒及其制造方法
公开(公告)号：US4514216A
公开(公告)日：1985-04-30
申请号：US573489
申请日：1984-01-24
申请人： Akio Mishima , Yoshiro Okuda , Tosiharu Harada , Akira Mukaizaka , Tomoyuki Imai
发明人： Akio Mishima , Yoshiro Okuda , Tosiharu Harada , Akira Mukaizaka , Tomoyuki Imai
IPC分类号： G11B5/706 , G11B5/712 , H01F1/09 , H01F1/33
CPC分类号： G11B5/712 , G11B5/706 , G11B5/70642
摘要： Disclosed herein is acicular ferromagnetic alloy particles for magnetic recording, containing Si, Cr, Ni and P and optionally Mg impregnated with phosphorus compound and silicon compound and process for producing the same.
摘要翻译：本文公开了用于磁记录的针状铁磁合金颗粒，其含有Si，Cr，Ni和P，以及任选的Mg被磷化合物和硅化合物浸渍，并且其制备方法。

3. 发明授权

US4406694A Process for producing acicular ferromagnetic alloy particles and acicular ferromagnetic alloy particles obtained by the said process 失效
标题翻译：通过所述方法得到的针状铁磁性合金粒子和针状铁磁性合金粒子的制造方法
公开(公告)号：US4406694A
公开(公告)日：1983-09-27
申请号：US285983
申请日：1981-07-23
申请人： Akio Mishima , Yosiro Okuda , Tosiharu Harada , Akira Mukaizaka
发明人： Akio Mishima , Yosiro Okuda , Tosiharu Harada , Akira Mukaizaka
IPC分类号： G11B5/62 , B22F1/00 , B22F9/22 , C09D5/23 , C09D7/12 , C22C38/00 , H01F1/06 , B22F1/02 , B22F9/18
CPC分类号： H01F1/065
摘要： A process for producing an acicular ferromagnetic alloy particles mainly containing iron and magnesium, which comprises preparing a suspension of iron(II) hydroxide and water-soluble magnesium salt, the suspension having a pH value of at least 11 and containing the magnesium salt in an amount of 0.5 to 20.0 atomic % based on the amount of the iron(II) hydroxide in the suspension and calculated as the ratio of Mg to Fe(II), oxidizing the suspension with an oxygen-containing gas to form an acicular particles of iron(III) oxide hydroxide substituted with magnesium, forming coats of phosphorus compound and subsequent silicon compound on the acicular particles, heating the resultant particle at 500.degree. to 900.degree. C. under a non-reducing atmosphere and then reheating the particle thus treated at 350.degree. to 600.degree. C. under reducing atmosphere.
摘要翻译：一种主要含铁和镁的针状铁磁性合金颗粒的制造方法，包括制备氢氧化铁（II）和水溶性镁盐的悬浮液，所述悬浮液的pH值至少为11，并含有镁盐相对于悬浮液中的氢氧化铁（II）的量为0.5〜20.0原子％，以Mg与Fe（II）的比例计算，用含氧气体氧化悬浮液，形成针状的铁粒子（III）氧化物氢氧化物，用镁取代，在针状颗粒上形成磷化合物和随后的硅化合物的涂层，在非还原气氛下在500-900℃下加热所得颗粒，然后在350℃下再加热处理的颗粒在还原气氛下，温度为600℃。

4. 发明授权

US5466306A Spindle-shaped magnetic iron based alloy particles 失效
标题翻译：主轴形磁铁基合金颗粒
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
IPC分类号： G11B5/706 , G11B5/714 , H01F1/06
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。

5. 发明授权

US5599378A Spindle-shaped magnetic iron based alloy particles and process for producing the same 失效
标题翻译：主轴形磁铁基合金颗粒及其制造方法
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
IPC分类号： G11B5/706 , G11B5/714 , H01F1/06 , H01F1/11 , H01F1/36
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。

6. 发明授权

US4495164A Process for producing acicular magnetite or acicular maghemite 失效
标题翻译：生产针状磁铁矿或针状磁赤铁矿的方法
公开(公告)号：US4495164A
公开(公告)日：1985-01-22
申请号：US512661
申请日：1983-07-11
申请人： Yosiro Okuda , Tosiharu Harada
发明人： Yosiro Okuda , Tosiharu Harada
IPC分类号： C01G49/06 , C01G49/08 , G11B5/706
CPC分类号： C01G49/06 , C01G49/08 , G11B5/70678 , C01P2004/03 , C01P2004/10 , C01P2004/54 , C01P2004/61 , C01P2004/62 , C01P2006/42
摘要： A process for producing acicular magnetite or maghemite of high axial ratio, which comprisespreparing an iron (II) hydroxide suspension at a pH of at least 11 with a magnesium sulfate or magnesium chloride in an amount of 0.5 to 7.0 atomic % based on the amount of the iron (II) hydroxide in the suspension and calculated as the ratio of Mg to Fe (II),oxidizing the resultant suspension with the oxygen-containing gas to form an acicular iron (III) oxide hydroxide in the form of particles having a long axis length of 0.3 to 2.0 .mu.m and an axial ratio of more than 20:1,reducing said acicular iron (III) oxide hydroxide into the acicular magnetite, and oxidizing the resultant acicular magnetite to form the acicular maghemite, if necessary.
摘要翻译：一种制备高轴比的针状磁铁矿或磁赤铁矿的方法，其包括以0.5至7.0原子％的量以硫酸镁或氯化镁制备pH至少为11的氢氧化铁（II）悬浮液，的悬浮液中的氢氧化铁（II），并以Mg与Fe（II）的比例计算，用含氧气体氧化所得的悬浮液，形成具有下列物质的颗粒形式的针状（III）氧化物氢氧化物长轴长度为0.3〜2.0μm，轴比为20:1以上，将针状铁氧化物氢氧化物还原成针状磁铁矿，并根据需要氧化所得针状磁铁矿以形成针状磁赤铁矿。

7. 发明授权

US5480571A Process for producing acicular goethite particles and acicular magnetic iron oxide particles 失效
标题翻译：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：US5480571A
公开(公告)日：1996-01-02
申请号：US309743
申请日：1994-09-21
申请人： Masaru Isoai , Tosiharu Harada , Tokihiro Kurata , Kazuhiro Fujita , Kazushi Takama , Shigekazu Jikuhara
发明人： Masaru Isoai , Tosiharu Harada , Tokihiro Kurata , Kazuhiro Fujita , Kazushi Takama , Shigekazu Jikuhara
IPC分类号： C01G49/06 , C01G49/08
CPC分类号： 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 step off: 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, an aqueous alkali carbonate solution, or an aqueous alkali hydroxide and alkali carbonate solution based on Fe.sup.2+ in said aqueous ferrous salt solution, in the presence of ascorbic acid or a salt thereof so as to oxidize said colloidal ferrous hydroxide or iron-containing colloidal precipitates and to produce acicular goethite particles throught green rust; 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一种碱金属氢氧化物水溶液，碱金属碳酸盐水溶液或碱金属氢氧化物和碱金属碳酸盐水溶液中，在所述含水亚铁盐水溶液中，在抗坏血酸或其盐的存在下，氧化所述胶体含氢氧化铁或含铁胶体沉淀物，并通过绿锈生成针状针铁矿颗粒; 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。

8. 发明授权

US5399278A Process for producing acicular goethite particles and acicular magnetic iron oxide particles 失效
标题翻译：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。

9. 发明授权

US5378380A Process for producing acicular geothite particles and acicular magnetic iron oxide particles 失效
标题翻译：生产针状地质颗粒和针状磁性氧化铁颗粒的方法
公开(公告)号：US5378380A
公开(公告)日：1995-01-03
申请号：US22847
申请日：1993-02-25
申请人： Masaru Isoai , Tosiharu Harada , Tokihiro Kurata , Kazuhiro Fujita , Kazushi Takama , Shigekazu Jikuhara
发明人： Masaru Isoai , Tosiharu Harada , Tokihiro Kurata , Kazuhiro Fujita , Kazushi Takama , Shigekazu Jikuhara
IPC分类号： C01G49/06 , C01G49/08
CPC分类号： 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 step 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, an aqueous alkali carbonate solution, or an aqueous alkali hydroxide and alkali carbonate solution based on Fe.sup.2+ in said aqueous ferrous salt solution, in the presence of ascorbic acid or a salt thereof so as to oxidize said colloidal ferrous hydroxide or iron-containing colloidal precipitates and to produce acicular goethite particles throught green rust; 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一种碱金属氢氧化物水溶液，碱金属碳酸盐水溶液或碱金属氢氧化物和碱金属碳酸盐水溶液中，在所述含水亚铁盐水溶液中，在抗坏血酸或其盐的存在下，氧化所述胶体含氢氧化铁或含铁胶体沉淀物，并通过绿锈生成针状针铁矿颗粒; 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。

10. 发明授权

US4873010A Spindle-like magnetic iron oxide particles and process for producing the same 失效
标题翻译：主轴状磁性氧化铁颗粒及其制造方法
公开(公告)号：US4873010A
公开(公告)日：1989-10-10
申请号：US039775
申请日：1987-04-15
申请人： Atsushi Takedoi , Hiroyuki Kondo , Masaru Isoai , Yoshitaka Yoshinaga , Tosiharu Harada , Yosiro Okuda , Hiroshi Sumita , Hirofumi Kawasaki , Kohji Mori
发明人： Atsushi Takedoi , Hiroyuki Kondo , Masaru Isoai , Yoshitaka Yoshinaga , Tosiharu Harada , Yosiro Okuda , Hiroshi Sumita , Hirofumi Kawasaki , Kohji Mori
IPC分类号： G11B5/706
CPC分类号： G11B5/70689 , G11B5/70652
摘要： Disclosed herein are magnetic iron oxide particles comprising spindle-like magnetite or maghemite particles having an aspect ratio(major:minor) of less than 4:1 and containing 0.1 to 20 atomic % of Si to Fe, and a process for producing the same.
摘要翻译：本文公开了包含具有小于4:1的纵横比（主要：次要）且包含0.1至20原子％的Si与Fe的纺锤状磁铁矿或磁赤铁矿颗粒的磁性氧化铁颗粒及其制备方法。

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