公开(公告)号：EP1511046A1

公开(公告)日：2005-03-02

申请号：EP03812349.3

申请日：2003-11-28

申请人： Neomax Co., Ltd.

发明人： YOSHIMURA, Koshi ,  OTANI, Tomoiku

IPC分类号： H01F41/02 ,  C23C26/00 ,  B05C11/08 ,  B05C13/02

CPC分类号： H01F1/0577 ,  B05C3/09 ,  B05C13/02 ,  C23C2/04 ,  C23C2/26 ,  C23C24/08 ,  C23C24/10 ,  C23C26/00 ,  C23C26/02 ,  H01F1/0578 ,  H01F1/059 ,  H01F41/026 ,  Y10T428/12063 ,  Y10T428/12465 ,  Y10T428/325

摘要： The objectives of the present invention are to provide a stable and simple method for producing a rare earth metal-based permanent magnet having on the surface thereof a corrosion-resistant film containing fine zinc particles dispersed therein, a corrosion-resistant rare earth metal-based permanent magnet produced by the method, a dip spin coating method being suitable for forming a coating film on thin type work pieces having various shapes, and a method for forming a coating film on a work piece. A method for producing a corrosion-resistant rare earth metal-based permanent magnet of the present invention, characterized in that it comprises providing an aqueous treating fluid, which contains a hydrolysis polymerization product of alkyl silicate and fine zinc particles having an average particle diameter of 1 µm to 50 µm and has a pH value of 6 to 8 and a viscosity of 1000 cP or less, applying the fluid on the surface of a rare earth metal-based permanent magnet, and subjecting the resultant magnet to a heat treatment at 250°C to 400°C, to thereby form a corrosion-resistant film containing fine zinc particles dispersed therein.

摘要翻译： 本发明的目标是提供一种制备具有在其表面上分散有耐腐蚀膜含锌微粒，具有耐腐蚀稀土金属为基础上的，稀土金属基永磁铁提供稳定的和简单的方法 由该方法产生永久磁铁，浸渍旋涂法适于形成具有各种形状的涂膜上薄型工件，以及用于形成涂膜在工件上的方法。 一种用于制造本发明的耐腐蚀的稀土类金属 - 永久磁铁的制造方法，其特征在于在没有它包括wässrige提供处理流体，其中含有硅酸烷基酯和锌微粒具有上的平均粒径的水解聚合产物 1微米至50微米，并具有6的pH值至8和1000厘泊或更小的粘度，在施加流体的稀土土金属基永磁铁的表面上，和使所生成磁体进行热处理 在250℃至400℃，从而形成其中分散有耐腐蚀膜含锌微粒。

公开(公告)号：EP1642661A1

公开(公告)日：2006-04-05

申请号：EP04734936.0

申请日：2004-05-26

申请人： Neomax Co., Ltd.

发明人： NAKAMURA, Akira ,  NAKASHIMA, Sumihito ,  OTANI, Tomoiku

IPC分类号： B22F3/02

CPC分类号： H01F41/0273 ,  B22F9/04 ,  B22F2009/045 ,  B22F2998/00 ,  C22C1/002 ,  C22C2202/02 ,  H01F1/0577 ,  C22C1/0441

摘要： A method for making a granulated powder according to the present invention includes the steps of: preparing a rare-earth alloy powder with remanent magnetization; feeding the powder onto a track 22, which is defined by a side surface 22a and a lower surface 22b that is sloped so as to decrease its height toward the side surface; and setting up vibrations on the track to give the powder kinetic energy, thereby transporting the powder along the length of the track and granulating the powder under a substantially zero magnetic field by utilizing an agglomeration force produced by the remanent magnetization of the powder and a tumbling action produced by the kinetic energy. As a result, a rare-earth alloy granulated powder, which has good flowability and good compactibility and which makes it possible to produce a magnet with excellent magnetic properties, can be obtained.