Class / Patent application number | Description | Number of patent applications / Date published |
148101000 | Permanent magnet | 22 |
20080223489 | RARE EARTH PERMANENT MAGNET AND ITS PREPARATION - A rare earth permanent magnet is prepared by disposing a powdered metal alloy containing at least 70 vol % of an intermetallic compound phase on a sintered body of R—Fe—B system, and heating the sintered body having the powder disposed on its surface below the sintering temperature of the sintered body in vacuum or in an inert gas for diffusion treatment. The advantages include efficient productivity, excellent magnetic performance, a minimal or zero amount of Tb or Dy used, an increased coercive force, and a minimized decline of remanence. | 09-18-2008 |
20080245442 | Preparation of Rare Earth Permanent Magnet Material - A method for preparing a rare earth permanent magnet material comprising the steps of:
| 10-09-2008 |
20080264522 | MAGNETIC STONE DEVICE AND METHOD OF MANUFACTURING THE SAME, AND MAGNETIC BEADS AND METHOD OF MANUFACTURING THE SAME - A magnetic stone device and assembly is provided. The magnetic stone device includes a magnetic stone and a metallic coating applied to at least part of the surface of the magnetic stone. The coating has a first color at a first portion of the magnetic stone and a second color different from said first color at a second portion of the magnetic stone. A method of manufacturing the magnetic stone device is also provided. A magnetic bead, assembly, and method of manufacture are also provided. | 10-30-2008 |
20100006182 | METHOD FOR PRODUCING RARE EARTH METAL-BASED PERMANENT MAGNET - An objective of the present invention is to provide a method for producing a rare earth metal-based permanent magnet having an Al film containing Mg, which exhibits an excellent salt water resistance. The present invention, which is to accomplish the objective, is a method for producing a rare earth metal-based permanent magnet having formed on the surface thereof an Al film containing Mg by a vapor deposition, characterized in that the production method comprises, in the case of cooling the magnet from a high temperature of 160° C. or higher after the completion of the vapor deposition step inside the treating chamber of a deposition apparatus, rapidly cooling down the magnet at a cooling rate of 10° C./min or higher until the temperature of the magnet reaches at least 60° C. | 01-14-2010 |
20100006183 | METHOD FOR PRODUCING A GIANT MAGNETOSTRICTIVE ALLOY - A rapidly solidified Fe—Ga alloy containing 15 to 23 atomic percent of Ga having a particular rapidly solidified texture is formed into slices which are laminated to each other in a die, or is formed into a powder or chops which are filled in the die. Subsequently, spark plasma sintering is performed so that bonds between the slices, grains of the powder, or the chops are formed at a high density to form a bulk alloy and the rapidly solidified texture is not lost, followed by annealing whenever necessary, so that a magnetostriction of 170 to 230 ppm at room temperature is obtained. | 01-14-2010 |
20100051139 | PERMANENT MAGNET AND METHOD OF MANUFACTURING SAME - There is provided a method of manufacturing a permanent magnet in which Dy and/or Tb adhered to the surface of a sintered magnet containing a lubricant can be efficiently diffused and in which the permanent magnet having high magnetic properties can be manufactured at good productivity. The permanent magnet is manufactured by executing a first step of adhering at least one of Dy and Tb to at least a part of a surface of a sintered magnet made by sintering iron-boron-rare earth based alloy raw meal powder containing a lubricant; and a second step of heat-treating the sintered magnet at a predetermined temperature to thereby disperse at least one of Dy and Tb adhered to the surface of the sintered magnet into grain boundary phase of the sintered magnet. At this time, as the sintered magnet, there is used one manufactured in an average grain size within a range of 4 μm˜8 μm. | 03-04-2010 |
20100252145 | METHOD FOR PRODUCING SURFACE-MODIFIED RARE EARTH METAL-BASED SINTERED MAGNET AND SURFACE-MODIFIED RARE EARTH METAL-BASED SINTERED MAGNET - An objective of the present invention is to provide a rare earth metal-based sintered magnet having imparted thereto sufficient corrosion resistance by an oxidative heat treatment, which is resistant even in an environment of fluctuating humidity, while suppressing the deterioration of the magnetic characteristics ascribed to the oxidative heat treatment, and to provide a method for producing the same. As a means of achieving the objective above, the surface-modified rare earth metal-based sintered magnet of the present invention is characterized in that the surface-modified part comprises a surface-modified layer comprising at least three layers formed in this order from the inner side of the magnet, a main layer containing R, Fe, B, and oxygen, an amorphous layer containing at least R, Fe, and oxygen, and an outermost layer containing iron oxide comprising mainly hematite as the constituent, and the method for producing the same is characterized in that it comprises a step of applying a heat treatment to a bulk magnet body in the temperature range of from 200° C. to 600° C., under an atmosphere with oxygen partial pressure in a range of from 1×10 | 10-07-2010 |
20110308668 | Ferrous Metal Magnetite Coating Processes and Reagents - A process for forming a magnetite coating on a ferrous metal surface and for chemical reagents used to implement the coating process. The process comprises the step of making the ferrous metal surface more reactive by contacting the surface with an activating reagent and then contacting the activated surface with an oxidizing reagent to form the coating at a relatively low temperature range. The surface is activated by contact with an acid solution to form a surface rich in reactive iron. The activated surface is then oxidized by contact with an aqueous reagent of alkali metal hydroxide, alkali metal nitrate, alkali metal nitrite, and mixtures thereof. | 12-22-2011 |
20120285583 | CERIUM BASED PERMANENT MAGNET MATERIAL - Useful permanent magnet materials are formed by processing molten alloys of cerium, iron, and boron to form permanent magnet compositions with appreciable coercivity and remanence. For example, Ce | 11-15-2012 |
20130087248 | METHOD FOR PRODUCING R-T-B-BASED SINTERED MAGNETS - A method for producing a sintered R-T-B based magnet includes the steps of: providing a sintered R-T-B based magnet body | 04-11-2013 |
20130160896 | CERIUM BASED PERMANENT MAGNET MATERIAL - Useful permanent magnet materials are formed by processing molten alloys of cerium, iron, and boron to form permanent magnet compositions with appreciable coercivity and remanence. For example, Ce | 06-27-2013 |
20140007980 | PERMANENT MAGNET AND MANUFACTURING METHOD THEREFOR - In permanent magnets formed by division, a cut-out part is provided in a straight line in the matrix of the permanent magnets, a metal having a higher coercive force than the permanent magnet matrix is diffused into the interior of the matrix from a surface that includes the surface of the cut-out part of the permanent magnet matrix, and the permanent magnet matrix is divided into multiple permanent magnet parts along the straight cut-out part to form the permanent magnets. An Nd—Fe—B sintered magnet may be used as the permanent magnet matrix, and, dysprosium (Dy) may be used as the metal having a higher coercive force. Multiple indentations disposed in a straight line may be used as the cut-out parts, or a straight groove may also be used. | 01-09-2014 |
20160055968 | METHOD OF PRODUCTION RARE-EARTH MAGNET - A production method includes producing a rare-earth magnet precursor (S′) by performing first hot working in which, in two side surfaces of a sintered body, which are parallel to a pressing direction and are opposite to each other, one side surface is brought to a constrained state to suppress deformation, and the other side surface is brought to an unconstrained state to permit deformation; and producing a rare-earth magnet by performing second hot working in which, in two side surfaces (S′ | 02-25-2016 |
20160141082 | IRON NITRIDE MATERIALS AND MAGNETS INCLUDING IRON NITRIDE MATERIALS - The disclosure describes magnetic materials including iron nitride, bulk permanent magnets including iron nitride, techniques for forming magnetic materials including iron nitride, and techniques for forming bulk permanent magnets including iron nitride. | 05-19-2016 |
148102000 | Age hardening | 3 |
20080277028 | Rare-Earth Alloy, Rare-Earth Sintered Magnet, And Methods Of Manufacturing - A rare-earth alloy ingot is produced by melting an alloy composed of 20-30 wt % of a rare-earth constituent which is Sm alone or at least 50 wt % Sm in combination with at least one other rare-earth element, 10-45 wt % of Fe, 1-10 wt % of Cu and 0.5-5 wt % of Zr, with the balance being Co, and quenching the molten alloy in a strip casting process. The strip-cast alloy ingot has a content of 1-200 μm size equiaxed crystal grains of at least 20 vol % and a thickness of 0.05-3 mm. Rare-earth sintered magnets made from such alloys exhibit excellent magnetic properties and can be manufactured under a broad optimal temperature range during sintering and solution treatment. | 11-13-2008 |
20100051140 | PERMANENT MAGNET AND METHOD OF MANUFACTURING SAME - By causing at least one of Dy and Tb to be adhered to the surface of an iron-boron-rare earth based sintered magnet of a predetermined shape, and is then to be diffused into grain boundary phase, a permanent magnet can be manufactured at high workability and low cost. An iron-boron-rare earth based sintered magnet is disposed in a processing chamber and is heated to a predetermined temperature. Also, an evaporating material made up of a fluoride containing at least one of Dy and Tb disposed in the same or another processing chamber is evaporated, and the evaporated evaporating material is caused to be adhered to the surface of the sintered magnet. The Dy and/or Tb metal atoms of the adhered evaporating material are diffused into the grain particle phase of the sintered magnet before a thin film made of the evaporated material is formed on the surface of the sintered magnet. | 03-04-2010 |
20150041022 | METHOD FOR PRODUCING NDFEB SYSTEM SINTERED MAGNET - A method for producing a NdFeB system sintered magnet in which a coating material containing a heavy rare-earth element R | 02-12-2015 |
148103000 | Treatment in a magnetic field | 5 |
20080289725 | Manufacturing Method of Magnetic Tip of Tape Measure - A manufacturing method of magnetic tip of tape measure comprising: first step which is preparing a conducting magnet material which is still not magnetized; second step which is setting said conducting magnet material into a die; third step which is casting a form material to produce a tip of tape measure structure and making said form material to combine with said conducting magnet material; fourth step which is magnetizing said conducting magnet material and manufacturing a magnetic tip of tape measure. | 11-27-2008 |
20100065156 | Method for producing rare earth anisotropic bond magnets, method for orientation processing of magnetic molded bodies, and in-magnetic filed molding apparatus - The present invention relates to a method for producing a rare earth anisotropic bond magnet containing a hollow cylindrically shaped magnetic molded body having, at the hollow cylindrically shaped side face thereof, at least 4 or more orientation portions that are oriented with semi-radial distribution by compression molding of a magnetic material after thermally orienting step, wherein intermediate aligning magnetic fields applied in the thermally orienting step to between adjacent cavities are the mostly same in their magnetic directions. A plurality of rare earth anisotropic bond magnets can be efficiently produced at one time. | 03-18-2010 |
20120006449 | METHOD FOR PRODUCING METALLIC IRON - The present invention provides a method for producing metallic iron, which is operable at low temperature. The present invention relates to a method for producing a metallic iron, which comprises heating and reducing a raw material mixture containing a carbonaceous reducing agent and an iron oxide-containing material to produce the metallic iron, wherein the carbonaceous reducing agent has a volatile content of 20 to 60 mass %, a gas derived from the carbonaceous reducing agent is a CO—CO | 01-12-2012 |
20130192723 | METHOD FOR MANUFACTURING BONDED MAGNET - A method for manufacturing a magnetized bonded magnet, including the steps of: arranging a magnetization permanent magnet for magnetizing a magnetic field near a non-magnetized bonded magnet; heating the non-magnetized bonded magnet to a temperature of a Curie point thereof or higher; and continuously magnetizing the magnetic field to the non-magnetized bonded magnet by the magnetization permanent magnet for magnetizing the magnetic field while cooling the non-magnetized bonded magnet reached at the temperature of the Curie point thereof or higher to a temperature of less than the Curie point, wherein the non-magnetized bonded magnet is a rare-earth iron bonded magnet including two or more different rare-earth elements in magnet powder thereof. | 08-01-2013 |
20140090751 | Hf-Co-B Alloys as Permanent Magnet Materials - An alloy composition is composed essentially of Hf | 04-03-2014 |