Patent application number | Description | Published |
20100321139 | PERMANENT MAGNET AND METHOD OF PRODUCING PERMANENT MAGNET - A method of producing a permanent magnet includes: forming a multiplicity of solidified ribbons that are composed of nanosized crystal grains by melting a magnet material and rapidly cooling the molten product; binding the multiplicity of solidified ribbons together by compression molding and sintering to form a sintered body; and performing plastic forming on the sintered body to provide the sintered body with a distribution of strain which increases from a peripheral portion to a central portion. | 12-23-2010 |
20120247624 | RARE EARTH MAGNET AND MANUFACTURING METHOD THEREFOR - A rare earth magnet of the invention has a composition represented by the compositional formula R | 10-04-2012 |
20120312422 | METHOD OF PRODUCING NANOCOMPOSITE MAGNET - A molten alloy that has a nanocomposite magnet composition is quenched and solidified to fabricate a foil that has a polycrystalline phase composed of a hard magnetic phase with an average crystal grain diameter of 10 to 200 nm and a soft magnetic phase with an average crystal grain diameter of 1 to 100 nm. The foil that includes a low melting point phase that is formed on a surface of the foil and that has a melting point that is lower than that of the polycrystalline phase is sintered. | 12-13-2012 |
20130195710 | METHOD FOR MANUFACTURING RARE-EARTH MAGNET - Provided is a manufacturing method of a rare-earth magnet capable of penetrant-diffusing a modifier alloy to increase a coercive force (especially a coercive force under a high-temperature atmosphere) at a temperature lower than the conventional method for manufacturing a rare-earth magnet without using heavy rare-earth metals such as Dy and Tb, and accordingly capable of manufacturing a high coercivity rare-earth magnet at the lowest cost possible. A method for manufacturing a rare-earth magnet includes the steps of: first step of pressing-forming powder as a rare-earth magnet material to form a compact S, the powder including a RE-Fe—B main phase MP (RE: at least one type of Nd and Pr) and a RE-X alloy (X: metal element) grain boundary phase surrounding the main phase; and second step of bringing a modifier alloy M into contact with the compact S or a rare-earth magnet precursor C obtained by hot deformation processing of the compact S, followed by heat treatment to penetrant-diffuse melt of the modifier alloy M into the compact S or the rare-earth magnet precursor C to manufacture the rare-earth magnet RM, the modifier alloy including a RE-Y (Y: metal element and not including a heavy rare-earth element) alloy having a eutectic or a RE-rich hyper eutectic composition. | 08-01-2013 |
20130248754 | PRODUCTION METHOD OF RARE EARTH MAGNET - The method of the present invention produces a rare earth magnet, which is represented by a neodymium magnet (Nd | 09-26-2013 |
20130323541 | AIR ELECTRODE FOR AIR BATTERY, METHOD OF PRODUCING SAME, AND AIR BATTERY - An air electrode for an air battery is provided constituting an air battery that is provided with an air electrode, a negative electrode, and an electrolyte interposed between the air electrode and the negative electrode, and containing the air electrode contains a magnet, and also an air battery having this air electrode is provided. A method of producing an air electrode for an air battery is provided constituting an air battery that is provided with an air electrode, a negative electrode, and an electrolyte interposed between the air electrode and the negative electrode, wherein a magnetization treatment is performed on an air electrode molding provided by molding an air electrode material that contains at least a magnet material. | 12-05-2013 |
20140191833 | METHOD FOR PRODUCING RARE EARTH MAGNETS, AND RARE EARTH MAGNETS - A method for producing a nanocrystalline rare earth magnet having a grain and a grain boundary phase includes: quenching a melt of a rare earth magnet composition to form a quenched thin ribbon having a nanocrystalline structure; sintering the quenched thin ribbon to obtain a sintered body; heat treating the sintered body at a temperature which is higher than a lowest temperature in a first temperature range where the grain boundary phase diffuses or flows, and which is lower than a lowest temperature in a second temperature range where the grain becomes coarse; and quenching the heat treated sintered body to 200° C. or less at a cooling speed of 50° C./min or more. | 07-10-2014 |
20140238553 | SINTERED BODY THAT IS PRECURSOR OF RARE-EARTH MAGNET, AND METHOD FOR PRODUCING MAGNETIC POWDER FOR FORMING THE SAME - Provided are a sintered body for forming a rare-earth magnet with a high degree of orientation and high remanent magnetization, and a method for producing magnetic powder for forming the sintered body. A sintered body S that is a precursor of a rare-earth magnet, the sintered body S including crystal grains g | 08-28-2014 |
20140260800 | METHOD FOR PRODUCING MAGNETIC POWDER FOR FORMING SINTERED BODY THAT IS PRECURSOR OF RARE-EARTH MAGNET - A method for producing magnetic powder for forming a sintered body that is a precursor of a rare-earth magnet. Provided is a method for producing magnetic powder for forming a sintered body that is a precursor of a rare-earth magnet, which can produce magnetic powder with a structure containing optimal nanosized crystal grains by accurately and efficiently sorting out magnetic powder containing no coarse grains in the structure thereof. A method for producing magnetic powder p for forming a sintered body S that is a precursor of a rare-earth magnet, the sintered body S including an Nd—Fe—B-based main phase with a nanocrystalline structure, and a grain boundary phase around the main phase, and the rare-earth magnet being adapted to be formed by applying hot deformation processing to the sintered body S for imparting anisotropy thereto and diffusing an alloy for improving coercivity therein, the method including discharging a metal melt onto a chill roll R to produce a quenched ribbon B, and grinding the quenched ribbon B into grains in the size range of 50 to 1000 μm to produce magnetic powder in the mass range of 0.0003 to 03 mg; conducting a test to see whether or not the magnetic powder in the mass range adsorbs onto a magnet with a surface magnetic flux density of 2 mT or less, and sorting out magnetic powder p that has not adsorbed onto the magnet, as the magnetic powder for forming the sintered body S. | 09-18-2014 |
20150008998 | RARE-EARTH NANOCOMPOSITE MAGNET - The invention provides a nanocomposite magnet, which has achieved high coercive force and high residual magnetization. The magnet is a non-ferromagnetic phase that is intercalated between a hard magnetic phase with a rare-earth magnet composition and a soft magnetic phase, wherein the non-ferromagnetic phase reacts with neither the hard nor soft magnetic phase. A hard magnetic phase contains Nd | 01-08-2015 |