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公开(公告)号：US5643650A
公开(公告)日：1997-07-01
申请号：US496256
申请日：1995-06-28
IPC分类号： G11B11/105 , G11B5/66
CPC分类号： G11B11/10591 , G11B11/10584 , G11B11/10586 , Y10S428/90
摘要： The recording sensitivity can be improved of a magneto-optical recording medium having a laminar structure consisting of a first dielectric layer, a recording layer, a second dielectric layer and reflecting layer successively formed on a transparent substrate plate by forming the reflecting layer from an alloy consisting of aluminum and from 0.05 to 3 atomic % of a rare earth element such as neodymium and gadolinium in place of pure aluminum as in conventional magneto-optical recording media.
摘要翻译： 通过从合金形成反射层，可以提高具有由第一电介质层，记录层，第二电介质层和反射层组成的层状结构的磁光记录介质的记录灵敏度 由铝和0.05〜3原子％的稀土元素如钕和钆代替纯铝如常规磁光记录介质。
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公开(公告)号：US5057165A
公开(公告)日：1991-10-15
申请号：US558788
申请日：1990-07-27
申请人： Hiroaki Nagata , Ken Ohashi , Yoshio Tawara , Kenichi Uesaka
发明人： Hiroaki Nagata , Ken Ohashi , Yoshio Tawara , Kenichi Uesaka
CPC分类号： H01F1/0557 , C22C1/0441 , H01F1/055
摘要： A rare earth permanent magnet of a composition, Ce(CO.sub.1-x-y-a Fe.sub.x Cu.sub.y M.sub.a).sub.z, where a, x, y, and z are: 0.005
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公开(公告)号：US4678634A
公开(公告)日：1987-07-07
申请号：US851529
申请日：1986-04-14
申请人： Yoshio Tawara , Ken Ohashi
发明人： Yoshio Tawara , Ken Ohashi
CPC分类号： H01F41/0273 , H01F13/003 , Y10S29/095
摘要： Method of preparing an anisotropic permanent magnet by a powder metallurgical technique, in which, the step of orientation of anisotropically magnetic particles during shaping by compression to give a green body prior to sintering, the magnetic field is applied pulse-wise to the mass of magnetic particles and an impacting compressive force is applied to the thus oriented particles in the direction parallel to the magnetic field during the period in which a pulse of the pulse-wise magnetic field is sustained. This method ensures a much higher degree of particle orientation than in the conventional static-field method by virtue of the possibility of obtaining a much stronger magnetic field without problems which otherwise are unavoidable. The principle of the method is applicable to the preparation of a cylindrical or annular permanent magnet magnetizable in a plurality of radial directions.
摘要翻译： 通过粉末冶金技术制备各向异性永久磁体的方法，其中，通过压缩成型期间各向异性磁性颗粒的取向步骤在烧结之前产生生坯，将磁场脉冲地施加到磁性体 在持续脉冲方向磁场的脉冲期间，颗粒和冲击压力在平行于磁场的方向上施加到这样取向的颗粒上。 由于可以获得更强的磁场而不存在问题，因此这种方法确保了比传统的静态方法高得多的颗粒取向度，否则这是不可避免的。 该方法的原理适用于制备可沿多个径向磁化的圆柱形或环形永磁体。
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公开(公告)号：US3947295A
公开(公告)日：1976-03-30
申请号：US440540
申请日：1974-02-07
申请人： Yoshio Tawara , Harufumi Senno
发明人： Yoshio Tawara , Harufumi Senno
CPC分类号： H01F1/0557 , H01F1/055
摘要： Bulk hardened magnetic materials with compositions expressed by a general formula Sm.sub.u Ce.sub.1.sub.-u (Co.sub.1.sub.-x.sub.-y Fe.sub.x Cu.sub.y).sub.z are provided. Compositions in the limited range of 0.3.ltoreq.u.ltoreq.1.0, 0.ltoreq.x.ltoreq.0.1, 0.09.ltoreq.y.ltoreq.0.18, 6.0.ltoreq.z.ltoreq.7.5 lead to magnetic materials with unexpectedly large maximum energy product and with a newly found two phase structure. Magnetic materials with maximum energy product of over 13 MG.sup.. Oe (megagauss) oersted), residual induction over 7000 G and intrinsic coercive force over 3000 Oe are obtained by subjecting the compositions to a sintering process.
摘要翻译： 提供具有由通式SmuCe1-u（Co1-x-yFexCuy）z表示的组成的块状硬化磁性材料。 在有限范围内的组合物在0.3
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公开(公告)号：US5554303A
公开(公告)日：1996-09-10
申请号：US397564
申请日：1995-03-02
CPC分类号： G11B5/8404
摘要： An improvement is proposed in the method for the preparation of a magnetic recording medium by forming a magnetic recording layer of a magnetic alloy on the surface of a non-magnetic substrate plate of, e.g., silicon so as to impart the magnetic recording medium with improved CSS (contact-start-stop) characteristics still without affecting the magnetic recording density. The improvement can be obtained by subjecting the surface of the substrate plate, prior to the formation of the magnetic recording layer, to a surface-roughening treatment which is performed either by a dry-process such as plasma etching and reactive ion etching or by a wet-process of anisotropic etching by using an aqueous solution of sodium or potassium hydroxide as the anisotropic etching solution. In particular, the plasma etching or reactive ion etching is conducted in the presence of a particulate scattering source body of aluminum, etc. placed in the vicinity of the CSS zone so that the surface-roughening effect is limited to the CSS zone by the deposition of particulates scattered therefrom leaving the recording zone unroughened not to decrease the recording density.
摘要翻译： 通过在例如硅的非磁性基板的表面上形成磁性合金的磁记录层，在制备磁记录介质的方法中提出了一种改进，以使磁记录介质具有改进的 CSS（接触开始 - 停止）特性仍然不影响磁记录密度。 可以通过在形成磁记录层之前将基板的表面进行表面粗糙化处理来获得改进，所述表面粗糙化处理通过诸如等离子体蚀刻和反应离子蚀刻之类的干法进行，或通过 通过使用氢氧化钠或氢氧化钾的水溶液作为各向异性蚀刻溶液进行各向异性蚀刻的湿法。 特别地，等离子体蚀刻或反应离子蚀刻在放置在CSS区域附近的铝等微粒散射源体的存在下进行，使得表面粗糙化效果通过沉积被限制到CSS区域 从而离开记录区未变粗糙的颗粒不会降低记录密度。
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公开(公告)号：US4497672A
公开(公告)日：1985-02-05
申请号：US481822
申请日：1983-04-04
申请人： Yoshio Tawara , Ken Ohashi
发明人： Yoshio Tawara , Ken Ohashi
CPC分类号： H01F1/0557
摘要： The permanet magnet composed of a rare earth element, e.g. samarium, and cobalt together with iron, copper and some other additive elements and prepared according to the inventive method has a high coercive force and excellent squareness of the magnetic hysteresis loop despite the relatively low content of copper which has been considered to be indispensable for obtaining a high coercive force. The characteristic feature of the inventive method consists in the aging treatment of the sintered body of the alloy powder of a specified composition undertaken in two or more steps, each being carried out by continuously cooling the sintered body within a specified temperature range at a specified cooling velocity.
摘要翻译： 由稀土元素构成的永磁体，例如， 钐和钴以及铁，铜和一些其它添加元素，并且根据本发明的方法制备具有高的矫顽力和极好的磁滞回线的平方度，尽管铜含量相对较低，这被认为是不可缺少的 高矫顽力。 本发明方法的特征在于，以特定组成进行两步或多步的合金粉末烧结体的时效处理，每个步骤通过在规定的温度范围内以特定的冷却 速度。
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公开(公告)号：US5582897A
公开(公告)日：1996-12-10
申请号：US365207
申请日：1994-12-28
申请人： Hideo Kaneko , Katsushi Tokunaga , Yoshio Tawara
发明人： Hideo Kaneko , Katsushi Tokunaga , Yoshio Tawara
CPC分类号： G11B5/7315 , Y10S428/90 , Y10S428/928 , Y10T428/12465 , Y10T428/24355
摘要： Proposed is a magnetic recording medium consisting of a non-magnetic substrate and a magnetic recording layer formed thereon by the sputtering method, in which the non-magnetic substrate is a disk of single crystal silicon having a surface substantially in parallel with the crystallographic (111) plane with an angle of deviation not exceeding 15.degree., of which the surface roughness Rp does not exceed 25 nm. By virtue of the use of the unique material for the substrate, the magnetic recording layer is outstandingly stable as compared with conventional aluminum or glass substrates and the magnetic layer formed thereon by sputtering has a greatly improved coercive force of 1300 oersted or higher.
摘要翻译： 提出了由非磁性基板和通过溅射法在其上形成的磁记录层构成的磁记录介质，其中非磁性基板是具有与晶体学（111）基本上平行的表面的单晶硅盘 ）平面，其偏转角不超过15°，其表面粗糙度Rp不超过25nm。 由于使用独特材料作为基板，所以与常规的铝或玻璃基板相比，磁记录层非常稳定，并且通过溅射在其上形成的磁性层的矫顽力大大提高了1300奥斯特或更高。
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公开(公告)号：US5034146A
公开(公告)日：1991-07-23
申请号：US554073
申请日：1990-07-16
申请人： Ken Ohashi , Yoshio Tawara
发明人： Ken Ohashi , Yoshio Tawara
CPC分类号： C22C1/0441 , H01F1/0577 , H01F41/0293
摘要： The magnetic properties or, in particular, coercive force of a sintered permanent magnet composed of a light rare earth element, boron and iron can be greatly improved without affecting the residual magnetic flux by the admixture of a relatively small amount of additive elements including heavy rare earth elements, aluminum, titanium, vanadium, niobium and molybdenum. In the inventive magnets, the distribution of the additive element is not uniform but localized in the vicinity of the grain boundaries of the matrix particles. Such a localized distribution of the additive elements is obtain by sintering a powder mixture composed of a powder of an alloy of the base ingredients and a powder containing the additive element or elements.
摘要翻译： 特别地，由轻稀土元素，硼和铁组成的烧结永磁体的磁特性或特定矫顽力可以大大提高，而不会通过相对少量的添加元素（包括重稀土元素）的混合物来影响剩余磁通量 地球元素，铝，钛，钒，铌和钼。 在本发明的磁体中，添加元素的分布不均匀，但位于基体颗粒的晶界附近。 添加元素的这种局部分布通过烧结由基础成分的合金粉末和含有添加元素的粉末组成的粉末混合物来获得。
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公开(公告)号：US4999228A
公开(公告)日：1991-03-12
申请号：US346736
申请日：1989-05-03
申请人： Fukuji Matsumoto , Yoshio Tawara , Michio Hayashi
发明人： Fukuji Matsumoto , Yoshio Tawara , Michio Hayashi
IPC分类号： C04B35/573 , C30B31/10
CPC分类号： C30B31/10 , C04B35/573 , Y10T428/131
摘要： Disclosed is a silicon carbide type diffusion tube comprising a diffusion tube base made of reaction-sintered silicon carbide having an iron concentration of 20 ppm or below and a density of 3.0 g/cm.sup.3 or over, and a silicon carbide layer consisting of a high-purity silicon carbide film having an iron concentration of 5 ppm or below deposited on the inner surface of the tube base and a silicon carbide type diffusion tube comprising a diffusion tube base made of reaction-sintered silicon carbide, and a silicon carbide layer consisting of a Si-depleted layer formed in the inner wall of the reaction-sintered silicon carbide tube base and a high-purity silicon carbide film deposited on the Si-depleted layer, said silicon carbide film having a thickness of more than 0.5 mm.
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公开(公告)号：US4375996A
公开(公告)日：1983-03-08
申请号：US265367
申请日：1981-05-20
申请人： Yoshio Tawara , Tetsuichi Chino , Ken Ohashi
发明人： Yoshio Tawara , Tetsuichi Chino , Ken Ohashi
摘要： The invention provides a rare earth metal-containing alloy for permanent magnets having a composition expressed by the formulaSm.sub.1-.alpha. Ce.sub..alpha. (Co.sub.1-x-y-u-v-w Fe.sub.x Cu.sub.y Ti.sub.u Zr.sub.v Mn.sub.w).sub.z,in which the suffixes are each a numerical value as defined by:0.1.ltoreq..alpha..ltoreq.0.90;0.10.ltoreq.x.ltoreq.0.30;0.05.ltoreq.y.ltoreq.0.15;0.002.ltoreq.u.ltoreq.0.03;0.002.ltoreq.v.ltoreq.0.03;0.005.ltoreq.w.ltoreq.0.08;with the proviso that 0.01.ltoreq.u+v+w.ltoreq.0.10; and 5.7.ltoreq.z.ltoreq.8.1 . The permanent magnets prepared with the alloy have very high magnetic properties, especially, in the coercive force and the maximum energy product even better than those obtained with a samarium-based alloy along with good machinability as in the cerium-based alloys suitable for mass production.
摘要翻译： 本发明提供一种用于永磁体的稀土金属合金，其具有由式Sm1-αCaα（Co1-xuv-wFexCuyTiuZrvMnw）z表示的组成，其中后缀各自为如下定义的数值： = alpha
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