公开(公告)号：US4915738A

公开(公告)日：1990-04-10

申请号：US188206

申请日：1988-04-29

申请人： Toshio Morimoto ,  Tatsuo Nate

发明人： Toshio Morimoto ,  Tatsuo Nate

IPC分类号： C23C14/16 ,  C23C14/34 ,  G11B11/105 ,  H01F10/13 ,  H01F41/18

CPC分类号： C23C14/165 ,  C23C14/3414 ,  G11B11/10589 ,  H01F10/135 ,  H01F10/137 ,  H01F41/183

摘要： An alloy target for making a magneto-optical recording medium by sputtering comprises an alloy containing 10 to 50 atom % of at least one rare earth element selected from among Sm, Nd, Gd, Tb, Dy, Ho, Tm and Er, with a balance consisting substantially of at least one transition metal selected from among Co, Fe and Ni. The alloy has a mixed structure composed of at least one phase of an intermetallic compound formed by the rare earth element and the transition metal and a phase of the rare earth element along.

公开(公告)号：US4689073A

公开(公告)日：1987-08-25

申请号：US834420

申请日：1986-02-28

申请人： Tatsuo Nate ,  Koichi Oka ,  Takehiko Sato

发明人： Tatsuo Nate ,  Koichi Oka ,  Takehiko Sato

IPC分类号： H01F1/055 ,  H01F1/06 ,  H01F1/33

CPC分类号： H01F1/06 ,  H01F1/0553

摘要： A rare earth-element/cobalt type magnetic powder which possesses outstanding magnetic properties and which is useful for making a resin magnet is produced by a method which comprises thermally reducing a mixture consisting of oxide of samarium, oxide of praseodymium, optionally oxide of neodymium, and cobalt powder, thereby causing diffusion of consequently produced samarium, praseodymium, and/or neodymium in the cobalt powder, subjecting the resultant reaction product to a heat-treatment involving standing at 600.degree. to 900.degree. C. for 30 minutes to 5 hours and subsequent quenching from this temperature at a rate of not less than 10.degree. C./minute, adding the product of the heat-treatment to water, thereby converting the product into a slurry, treating the slurry with water and an aqueous acid solution, and comminuting the resulting powder into particles of an average diameter of 3 to 10 .mu.m thereby obtaining a magnetic powder having a composition represented by Sm.sub.1-x Pr.sub.x Co.sub.z or Sm.sub.1-x Pr.sub.x-y Nd.sub.y Co.sub.z (wherein x, y, and z satisfy the relations 0.05.ltoreq.x.ltoreq.0.40, 0.01.ltoreq.y.ltoreq.0.39, 0.01.ltoreq.x-y.ltoreq.0.39 and 4.7.ltoreq.z.ltoreq.5.3).

摘要翻译： 具有突出的磁特性并且可用于制备树脂磁体的稀土元素/钴型磁性粉末是通过以下方法制造的：包括热还原由钐氧化物，镨氧化物，任选的钕氧化物组成的混合物， 钴钴粉末，由此引起钴粉末中所产生的钐，镨和/或钕的扩散，使得到的反应产物进行热处理，包括在600-900℃静置30分钟至5小时， 随后从该温度以不低于10℃/分钟的速度淬火，将热处理产物加入水中，从而将产物转化为浆液，用水和酸水溶液处理浆料，以及 将所得粉末粉碎成平均粒径为3〜10μm的颗粒，得到具有由Sm1-xPrxCoz或Sm1-xPrx表示的成分的磁性粉末 -yNdyCoz（其中x，y和z满足0.05≤x≤0.40,0.01≤y≤0.39,0.01≤x≤0.39和4.7≤x≤0.33， = 5.3）。

公开(公告)号：US4865660A

公开(公告)日：1989-09-12

申请号：US219856

申请日：1988-07-13

申请人： Tatsuo Nate ,  Koichi Oka ,  Takehiko Satoh

发明人： Tatsuo Nate ,  Koichi Oka ,  Takehiko Satoh

IPC分类号： H01F1/055 ,  H01F1/06

CPC分类号： H01F1/06 ,  H01F1/0553

摘要： Magnetic powder of the samarium/praseodymium/cobalt type and of the samarium/praseodymium/neodymium/cobalt type having specific compositions is substantially composed of (1-5) single phase, has improved residual magnetic flux density and a high maximum energy product, and is hence suitable for resin magnets. In addition, production cost is lower compared with conventional rare-earth metal/cobalt type magnet powder because part of samarium metal has been replaced by praseodymium and neodymium which are more abundant and less expensive materials.

摘要翻译： 具有特定组成的钐/镨/钴型和钐/镨/钕/钴型磁性粉末基本上由（1-5）单相组成，具有改善的剩余磁通密度和高最大能量积，以及 因此适用于树脂磁体。 另外，与常规的稀土金属/钴型磁体粉末相比，生产成本较低，因为钐金属的一部分被更丰富且更便宜的材料的镨和钕代替。