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1. 发明授权

US5609789A Cobalt-containing magnetic iron oxide and process for producing the same 失效
标题翻译：含钴磁性氧化铁及其制造方法
公开(公告)号：US5609789A
公开(公告)日：1997-03-11
申请号：US635540
申请日：1996-04-22
申请人： Kiyoshi Asano , Arata Koyama , Nobusuke Takumi , Shigeru Takatori , Kouichi Tamura , Tokuo Suita
发明人： Kiyoshi Asano , Arata Koyama , Nobusuke Takumi , Shigeru Takatori , Kouichi Tamura , Tokuo Suita
IPC分类号： C01G49/06 , G11B5/706 , C04B35/26
CPC分类号： C01G49/06 , G11B5/70673 , G11B5/70684 , C01P2006/12 , C01P2006/42 , Y10T428/2991
摘要： Cobalt-containing magnetic iron oxide particles extremely suitable for magnetic recording mediums, especially for image recording mediums and a process for producing the same from the precursor, .gamma.-FeOOH which is advantageous in industry are disclosed. Cobalt-containing magnetic iron oxide particles satisfying the following equations (1), (2) and (3):20.ltoreq.SSA.ltoreq.50 (1)-16.70.ltoreq.log [V].ltoreq.-3.05 log [SSA]-11.35 (2)0.10.ltoreq.Fe.sup.2+ /total Fe.ltoreq.0.30 (3)where SSA is a BET specific surface area (m.sup.2 /g), and V is a magnetic switching unit (cm.sup.3), can be produced by producing iron oxide particles having a concentration of Fe.sup.2+ of 0.10 to 0.36 as expressed by Fe.sup.2+ /total Fe from the precursor, .gamma.-FeOOH, and coating a cobalt compound or a combination of a cobalt compound and other metal compounds on the surfaces of the iron oxide particles.
摘要翻译：公开了非常适合于磁记录介质的钴的磁性氧化铁颗粒，特别是对于图像记录介质及其从前体制备的方法，其在工业上是有利的。满足以下等式（1），（2）和（3）的含钴磁性氧化铁颗粒：20

2. 发明授权

US4551327A Process for producing cobalt-and ferrous iron-containing ferromagnetic iron oxides 失效
标题翻译：制备含铁和含铁铁的铁磁性氧化铁的方法
公开(公告)号：US4551327A
公开(公告)日：1985-11-05
申请号：US513033
申请日：1983-07-12
申请人： Ichiro Honma , Arata Koyama , Masatoshi Amano , Nobusuke Takumi
发明人： Ichiro Honma , Arata Koyama , Masatoshi Amano , Nobusuke Takumi
IPC分类号： C01G51/00 , C01G49/00 , C01G49/06 , G11B5/706 , H01F1/10 , H01F1/11
CPC分类号： G11B5/70673 , G11B5/70684
摘要： An aqueous slurry of a magnetic iron oxide powder is mixed with a suspension prepared by neutralizing an aqueous ferrous salt solution with an alkali to form ferrous hydroxide and then adding an aqueous cobalt salt solution thereto, and the excess OH concentration of the mixed slurry is adjusted to 0.05 to 3 mol/l, thereby obtaining a cobalt-and ferrous iron-containing ferromagnetic iron oxide. The cobalt-and ferrous iron-containing ferromagnetic iron oxide is excellent in coercivity, distribution of coercivity and other magnetic properties, and the magnetic tape produced by using such iron oxide is also excellent in coercivity and switching field distribution.
摘要翻译：将磁性氧化铁粉末的水性浆料与通过用碱中和亚铁盐水溶液制备的悬浮液混合形成氢氧化亚铁，然后向其中加入钴盐水溶液，并调节混合浆料的过量OH浓度至0.05至3mol / l，从而获得含铁和含铁铁的铁磁性氧化铁。含钴铁和含铁铁的铁磁性氧化铁的矫顽力，矫顽力分布等磁性能优异，通过使用这种氧化铁制造的磁带也具有优异的矫顽力和切换场分布。

3. 发明授权

US5585032A Ferromagnetic fine powder for magnetic recording 失效
标题翻译：用于磁记录的铁磁细粉
公开(公告)号：US5585032A
公开(公告)日：1996-12-17
申请号：US437544
申请日：1995-05-09
申请人： Kazuo Nakata , Masaharu Hirai , Nobusuke Takumi , Saburo Kato
发明人： Kazuo Nakata , Masaharu Hirai , Nobusuke Takumi , Saburo Kato
IPC分类号： G11B5/706 , C04B35/26
CPC分类号： G11B5/70678
摘要： Ferromagnetic fine powder for magnetic recording, characterized by comprising platelet like ferrite crystal particles which have such a metallic element composition that the Ba/Fe molar ratio is 1/50 to 1/8 and that the total amount of Ni and Zn is less than 0.5 mole and not less than 0.07 mole per mole of Fe, a crystal phase of magnetoplumbite phase, spinel phase or composite phase thereof and a saturation magnetization of 60 emu/g or more; and a process for producing said ferromagnetic fine powder for magnetic record.
摘要翻译：用于磁记录的铁磁细粉末，其特征在于包括具有Ba / Fe摩尔比为+ E的金属元素组成的片状铁氧体晶体颗粒，1/50 + EE至+ E，fra 1/8 + EE和 Ni和Zn的总量小于0.5摩尔且不小于0.07摩尔/摩尔Fe，磁铅矿相的结晶相，尖晶石相或其复合相，饱和磁化强度为60emu / g以上; 以及用于制造用于磁记录的所述铁磁性细粉末的方法。

4. 发明授权

US5246609A Process for preparing ferromagnetic fine particles for magnetic recording 失效
标题翻译：用于制备用于磁记录的铁磁细颗粒的方法
公开(公告)号：US5246609A
公开(公告)日：1993-09-21
申请号：US932895
申请日：1992-08-20
申请人： Kazuo Nakata , Masaharu Hirai , Nobusuke Takumi , Saburo Kato
发明人： Kazuo Nakata , Masaharu Hirai , Nobusuke Takumi , Saburo Kato
IPC分类号： G11B5/706
CPC分类号： G11B5/70678
摘要： A process for producing ferromagnetic fine particles for magnetic recording which comprises preparing a starting material solution containing Ba, Fe and Me (Me representing at least one element selected from the group consisting of Co, Ti, Ni, Mn, Zr, Zn, Ge, Nb and V, the amount of which is 0.2 mol or less per mol of Fe) selected such that the molar ratio of Ba/(Fe+Me) is (1+m)/12 (m being a number of 0.1 to 2), mixing this starting material solution with an alkaline solution to form a coprecipitate-containing alkaline suspension, collecting and using the coprecipitate as precursor, or subjecting the coprecipitate-containing alkaline suspension to a heat treatment at a temperature below 250.degree. C. to form a precursor, and calcining such precursor at 650.degree.-950.degree. C. to produce the hexagonal platelet Ba-ferrite particles. The process is further characterized in that a boron compound is contained in the precursor in an amount of (0.01 to 1) mmol (calculated as B.sub.2 O.sub.3) per 12 mols of Fe and Me combined.
摘要翻译：一种制备用于磁记录的铁磁细颗粒的方法，包括制备含有Ba，Fe和Me的原料溶液（Me代表选自Co，Ti，Ni，Mn，Zr，Zn，Ge， Nb / V的摩尔比为（1 + m）/ 12（m为0.1〜2）的摩尔比，选择Nb / 将该原料溶液与碱性溶液混合以形成含共沉淀物的碱性悬浮液，收集并使用共沉淀物作为前体，或在低于250℃的温度下对含共沉淀物的碱性悬浮液进行热处理，形成前体，并在650-950℃下煅烧这种前体以产生六方晶系的Ba-铁素体颗粒。该方法的特征还在于，前体中含有硼化合物的量为（0.01-1）mmol（以B 2 O 3计）/ 12摩尔Fe和Me组合。

5. 发明授权

US4594267A Process for producing cobalt-containing magnetic iron oxide powder 失效
标题翻译：含钴磁性氧化铁粉末的制造方法
公开(公告)号：US4594267A
公开(公告)日：1986-06-10
申请号：US715775
申请日：1985-03-25
申请人： Ichiro Honma , Masaharu Hirai , Masatoshi Amano , Nobusuke Takumi
发明人： Ichiro Honma , Masaharu Hirai , Masatoshi Amano , Nobusuke Takumi
IPC分类号： C01G49/00 , G11B5/706 , H01F1/11 , C01G49/06
CPC分类号： G11B5/70673
摘要： A cobalt-containing magnetic iron oxide powder is provided by first coating a magnetic iron oxide base powder with a ferrous compound and then coating it with a cobalt compound. The cobalt-containing magnetic iron oxide powder provided is improved in stability of coercivity under aging and various other magnetic properties, and the magnetic tape produced by using the powder is also appreciably improved in stability of coercivity under aging as well as in various magnetic properties such as squareness, orientability and switching field distribution.
摘要翻译：提供含钴磁性氧化铁粉末，首先用铁化合物涂覆磁性氧化铁基底粉末，然后用钴化合物涂覆。所提供的含钴磁性氧化铁粉末在老化和各种其它磁性能下的矫顽力的稳定性得到改善，并且通过使用粉末制造的磁带也在老化下矫顽力的稳定性以及各种磁性能作为平方度，定向性和开关场分布。

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