公开(公告)号：US5930582A

公开(公告)日：1999-07-27

申请号：US217207

申请日：1998-12-22

申请人： Masaru Ito ,  Ken Ohashi ,  Yoshio Tawara ,  Tadao Nomura ,  Takehisa Minowa

发明人： Masaru Ito ,  Ken Ohashi ,  Yoshio Tawara ,  Tadao Nomura ,  Takehisa Minowa

IPC分类号： C22C33/02 ,  C22C38/00 ,  H01F1/053 ,  H01F1/057 ,  H01F1/08 ,  H01F41/02 ,  B22F3/12 ,  B22F1/00

CPC分类号： B82Y25/00 ,  H01F1/0577 ,  H01F1/0579

摘要： Disclosed is a method for the preparation of a novel composite rare earth-based magnetically anisotropic sintered permanent magnet in which: (a) a base alloy consisting of a host phase of R.sub.2 T.sub.14 B (R: a rare earth element; T: iron or a combination of iron and cobalt) having a particle diameter of 2 to 10 .mu.m and containing in each particle a phase rich in the content of T and having a particle diameter not exceeding 1 .mu.m is prepared by the strip casting method; (b) the base alloy is crushed; (c) the base alloy powder is blended in a specified proportion with a powder of an auxiliary alloy of R-T or R-T-B in a specified proportion; (d) the powder blend is subjected to further comminution; (e) the comminuted powder blend is subjected to compression-molding in a magnetic field into a powder compact; and (f) the powder compact is sintered by a heat treatment.

摘要翻译： 公开了一种制备新型复合稀土类磁各向异性烧结永磁体的方法，其中：（a）由R2T14B的主相（R：稀土元素; T：铁或组合 的铁和钴），通过带状铸造法制备颗粒直径为2〜10μm，并且在每个颗粒中含有富含T含量的相，其粒径不超过1μm的相。 （b）将基础合金粉碎; （c）以规定比例将基础合金粉末以规定比例与R-T或R-T-B的辅助合金粉末混合; （d）粉末混合物进一步粉碎; （e）粉碎的粉末混合物在磁场中进行压缩成型成粉末压块; 和（f）粉末压坯通过热处理烧结。

公开(公告)号：US6078237A

公开(公告)日：2000-06-20

申请号：US218005

申请日：1998-12-22

申请人： Tadao Nomura ,  Ken Ohashi ,  Takehisa Minowa ,  Yoshio Tawara ,  Masaru Ito

发明人： Tadao Nomura ,  Ken Ohashi ,  Takehisa Minowa ,  Yoshio Tawara ,  Masaru Ito

IPC分类号： C22C38/00 ,  H01F1/053 ,  H01F1/057 ,  H01F7/02

CPC分类号： B82Y25/00 ,  H01F1/057 ,  H01F1/0571 ,  H01F1/0576 ,  H01F1/0579

摘要： Disclosed is a rare earth-based, magnetically anisotropic permanent magnet material consisting of a rare earth element, e.g., neodymium or praseodymium, iron optional in combination with cobalt and boron and having excellent magnetic properties by virtue of the magnetic coupling between the magnetically hard and soft phases. The magnet material has a structure consisting of crystalline particles of, e.g., Nd.sub.2 Fe.sub.14 B, having a particle diameter of 1 .mu.m or larger and fine crystals of iron of submicron size in a rod-shaped or platelet form precipitated within each crystalline particle of Nd.sub.2 Fe.sub.14 B. This magnet material can be prepared by several different methods including, for example, a solid phase reaction of an intermetallic compound of Nd.sub.2 Fe.sub.17 with boron to effect a double decomposition reaction producing Nd.sub.2 Fe.sub.14 B and iron.

摘要翻译： 公开了一种稀土类磁性各向异性永磁材料，其由稀土元素（例如钕或镨）组成，铁与钴和硼组合可选，并且由于磁性硬和 软相。 磁体材料具有由例如粒径为1μm以上的Nd 2 Fe 14 B的结晶粒子构成的结构，在Nd 2 Fe 14 B的各结晶粒子内析出棒状或者血小板形状的亚微米尺寸的铁的微细结晶。 该磁体材料可以通过几种不同的方法制备，包括例如Nd 2 Fe 17的金属间化合物与硼的固相反应，以产生产生Nd 2 Fe 14 B和铁的双重分解反应。

公开(公告)号：US5514468A

公开(公告)日：1996-05-07

申请号：US145173

申请日：1993-11-03

申请人： Hideo Kaneko ,  Katsushi Tokunaga ,  Yoshio Tawara ,  Yoshiaki Shimizu ,  Tadao Nomura

发明人： Hideo Kaneko ,  Katsushi Tokunaga ,  Yoshio Tawara ,  Yoshiaki Shimizu ,  Tadao Nomura

IPC分类号： G11B11/105 ,  B32B3/02 ,  B32B5/16 ,  G11B5/66

CPC分类号： G11B11/10584 ,  G11B11/10593 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magneto-optical recording medium having a layered structure consisting of a first dielectric layer, magnetic recording layer, second dielectric layer and reflecting layer successively formed on a transparent substrate plate can be imparted with improved performance relative to the recording sensitivity and the C/N ratio when the recording layer and the second dielectric layer each have such a thickness that the angle .delta. given by the equation .delta.=tan.sup.-1 (.epsilon./.theta.k), in which .epsilon. is the Kerr ellipticity of the regenerative light and .theta.k is the Kerr rotation angle, does not exceed 10.degree., the thickness of the recording layer being in the range from 8 nm to 13.5 nm and the thickness of the second dielectric layer satisfying the relationship given by the inequality0.06.ltoreq.nd/.lambda..ltoreq.0.14,in which d is the thickness of the second dielectric layer, .lambda. is the wavelength of the regenerative light for reading-out of the recorded signals and n is the refractive index of the material forming the second dielectric layer to the regenerative light of wavelength .lambda..

摘要翻译： 具有由第一电介质层，磁记录层，第二电介质层和连续形成在透明基板上的反射层组成的层状结构的磁光记录介质可以相对于记录灵敏度和C / N 当记录层和第二介电层各自具有这样的厚度，即由等式delta = tan-1（epsilon /θk）给出的角度δ，其中ε是再生光的Kerr椭圆率和θk是 克尔旋转角不超过10°，记录层的厚度在8nm至13.5nm的范围内，第二介电层的厚度满足不等式0.06

公开(公告)号：US5118573A

公开(公告)日：1992-06-02

申请号：US601659

申请日：1990-10-25

申请人： Yoshio Tawara ,  Katsushi Tokunaga ,  Tadao Nomura ,  Yoshiaki Shimizu ,  Yoshihiro Kubota ,  Meguru Kashida

发明人： Yoshio Tawara ,  Katsushi Tokunaga ,  Tadao Nomura ,  Yoshiaki Shimizu ,  Yoshihiro Kubota ,  Meguru Kashida

IPC分类号： G11B11/105

CPC分类号： G11B11/10586 ,  Y10S428/90

摘要： An improvement is obtained in the stability and recording density of a magneto-optical recording medium having a laminar structure on a transparent substrate plate successively consisting of a first dielectric layer, a magnetic recording layer, a second dielectric layer and a metallic light-reflecting layer by forming the dielectric layer with a unique and specific dielectric material which is an amorphous composite material comprising boron and hydrogen in a specified weight proportion formed by the method of plasma CVD or sputtering. The dielectric material can be a ternary composite of boron, hydrogen and nitrogen or quaternary composite of boron, hydrogen, nitrogen and silicon or carbon.

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

IPC分类号： H01F1/055 ,  H01F1/02

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。

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

IPC分类号： H01F1/053 ,  C22C1/04 ,  C22C19/07 ,  H01F1/055

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

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

IPC分类号： H01F13/00 ,  H01F41/02 ,  B22F1/00

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。

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

IPC分类号： H01F1/08 ,  C22C1/04 ,  C22C38/00 ,  H01F1/053 ,  H01F1/057

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。

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

IPC分类号： C22C19/07 ,  H01F1/04 ,  H01F1/053 ,  H01F1/055 ,  C04B35/00

CPC分类号： H01F1/055 ,  C22C19/07

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

公开(公告)号：US4971637A

公开(公告)日：1990-11-20

申请号：US357368

申请日：1989-05-25

申请人： Ken Ohashi ,  Yoshio Tawara ,  Ryo Osugi

发明人： Ken Ohashi ,  Yoshio Tawara ,  Ryo Osugi

IPC分类号： C22C19/07 ,  C22C38/00 ,  H01F1/053 ,  H01F1/055 ,  H01F1/057 ,  H01F1/058

CPC分类号： H01F1/055 ,  H01F1/057 ,  H01F1/058

摘要： A rare earth permanent magnet of the formulaR(Fe.sub.1-x-y Co.sub.x M.sub.y).sub.z,in which R is rare earth element(s) and/or Y, M is Si, Ti, Mo, B, W, V, Cr, Mn, Al, Nb, Ni, Sn, Ta, Zr, and/or Hf, and x, y, z are numbers such that0.ltoreq.x.ltoreq.0.99,0.01.ltoreq.y.ltoreq.0.03, and8.5