1661results about How to "Strong magnetism" patented technology

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 surface thereof 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.

The invention discloses a method for preparing a heavy rare earth hydride nano-particle doped sintered NdFeB permanent magnet, which belongs to the technical field of magnetic materials. The prior preparation method improves the coercive force and the temperature stability of magnets by adding heavy rare earth elements, namely terbium or dysprosium into master alloy, but the method can cause the residual magnetism of the magnets, the reduction of magnetic energy product and the increase of manufacturing cost. The method adopts heavy rare earth terbium hydride and dysprosium hydride nano-powder doping technology to prepare the sintered NdFeB permanent magnet with high coercive force and excellent magnetic property. The method comprises the following steps: preparing NdFeB powder by a rapidly solidified flake process and a hydrogen decrepitation process; preparing the terbium hydride or the dysprosium hydride nano-powder by physical vapor deposition technology; mixing the two powders, and performing magnetic field orientation and press forming; and performing dehydrogenation treatment, sintering and heat treatment on a green compact at different temperatures, and obtaining the sintered magnet. The coercive force of the magnet prepared by the method is higher than that of the prior sintered magnet with the same ingredients; and compared with the sintered magnet with the equivalent coercive force, the proportion of the terbium and dysprosium needed by the magnet prepared by the method is remarkably reduced.

The invention discloses a magnetic carbon nanotube composite material and a preparation method and an application thereof. The preparation method comprises the following steps: adding FeCl3.6H2O to an ethylene glycol solution; then adding anhydrous sodium acetate and polyethylene glycol; adding a carboxylated multiwalled carbon nanotube; performing ultrasonic dispersion; adding hexamethylenediamine or ethanediamine; heating to 200-300 DEG C for reaction for 8-24h; and washing and performing vacuum drying to prepare the amino-modified magnetic Fe3O4-carbon nanotube composite material. The amino-modified magnetic Fe3O4-carbon nanotube composite material prepared by the invention is of nanoscale and superparamagnetism, can be stably dispersed in solutions, and can be quickly separated and enriched through a simple action of a magnetic field. As an adsorbent, the material is large in superficial area and has various active groups on the surface. The material can adsorb pigments from complex substrates through pi-pi electron interaction and hydrophobic effect of the carbon nanotube and can adsorb compounds such as organic acids and phenols through weak anion exchange effect of amino groups on the surfaces of magnetic nanoparticles.

The invention discloses a magnetic liquid damping device, relates to a damping device and aims to solving the damping problem of a longer object in a spacecraft. The device consists of a non-magnetic conducting shell (2), magnetic liquid (3), a permanent magnet (4), a nut (5), an end cover (6), a bolt (7), a screw (9), a sealing gasket (10) and an O-shaped seal ring (11), wherein the parts are connected together; the permanent magnet (4) is arranged in the cavity of the non-magnetic conducting shell (2); the end cover (6) with the O-shaped seal ring (11) is fixed on one end of the non-magnetic conducting shell (2) through the bolt (7) and the nut (5); the magnetic liquid (3) is filled in the cavity of the non-magnetic conducting shell (2) through a screwed hole (8); the screw (9) and the sealing gasket (10) are used for sealing; the permanent magnet (4) is a cylinder; and 4-8 through holes are distributed in the cylinder axially. The device disclosed by the invention has good damping effect.

The invention relates to non-oriented electrical steel produced by sheet continuous casting and rolling and a method thereof. The steel contains the following components by in percentage of by weight: 0.0031%-0.01% of C, 1.0-1.7% of Si, 1.0-2.4% of Si+2Al, at mostnot less than 0.5% of Al, 0.5-1.5% of Mn, not less thanat most 0.10% of P, not less thanat most 0.008% of S, not less thanat most 0.005% of N, not less thanat most 0.008% of Ti, and not less thanat most 0.010% of Ca, wherein Si+2Al is 1.0-2.4%. The method comprises the following steps of: smelting and treating by in vacuum; continuously casting, and controlling the thickness of a casting blank to be thickness within 50-90mm; soaking, controlling the temperature of the casting blank to be 850-950 DEG C before entering the furnace; finish rolling; coiling at the temperature of 690-780 DEG C; prickling; cold rolling; decarburizing, and controlling at the temperature to of 800-920 DEG C; and coating or not coating as required by users. The invention has no need of additionally arranging equipment and the normalizing and secondary cold rolling of hot rolled plates, the magnetism of the steel plate is good, and the corrugated defect is not found in test.

The invention relates to a method for producing high magnetic induction orientation silicon steel with excellent magnetic performance and a good bottom layer. The method comprises the following steps: (1) smelting, casting, making steel by using a converter or an electric furnace, and performing secondary refining and continuous casting on molten steel to obtain a plate blank; (2) performing hot rolling; (3) normalizing: performing two-section normalization, and then cooling; (4) performing cold rolling: rolling the normalized plate into the plate with the thickness of the finished product plate by a primary cold rolling method; (5) performing decarburizing annealing and nitriding annealing; (6) coating MgO coating and annealing at high temperature; and (7) coating insulating coating on the surface of a high-temperature annealing plate and performing heat drawing and flat annealing to obtain the high magnetic induction orientation silicon steel with excellent magnetic performance. According to the method, the problem of nitrogen stability in the plate after nitriding is solved, so that secondary recrystallization in the high-temperature annealing process is perfected and the high magnetic induction orientation silicon steel with excellent magnetic performance (B8 is more than or equal to 1.90 T and P17/50 is less than or equal to 1.00 w/kg), with the good bottom layer and without the defects of crystal exposure and frost descend is obtained finally.

The invention relates to a grain boundary diffusion method for improving properties of sintered NdFeB magnets. The grain boundary diffusion method comprises the following steps of stacking sintered NdFeB magnets and diffusion alloy sheets together and placing in a hot-pressing furnace; vacuumizing the hot-pressing furnace until the vacuum degree reaches a set value, heating the hot-pressing furnace, and when the temperature of the hot-pressing furnace reaches a set value, beginning to exert a pressure and maintaining the pressure and putting the diffused sample into a high-vacuum furnace for annealing, wherein the diffusion alloy sheets are low-melting-point eutectic diffusion alloys and are represented by R-TM, R is one or more of Sc, Y, La, Ce, Pr or Nd and TM is one or more of Ti, V, Cr, Mn, Fe, Co, Ni, Cu and Zn. Compared with the prior art, the sintered NdFeB magnets modified by the pressure diffusion method, which is provided by the invention, have the advantages of large diffusion depth of a diffusion agent, uniform distribution of grain boundary phases, high coercivity and the like, especially, low-melting-point diffusion alloys designed by the invention are free of expensive heavy rare earth element dysprosium and thus the cost of the raw materials is relatively low, the diffusion temperature is low and the energy consumption in the diffusion process is small.

The invention discloses non-oriented silicon steel for a drive motor of an electric automobile and a preparation method thereof. The performance of a silicon steel strip is controlled by optimizing chemical compositions and controlling the soaking time and soaking temperature of incomplete recrystallization annealing to regulate the recrystallization proportion. According to a rotor core made of the non-oriented silicon steel strip obtained after incomplete recrystallization annealing, the yield strength can reach 500 MPa or above, the Vickers hardness is 250 or below, and abrasion to a die is fully considered on the premise of guaranteeing the rotor strength. In addition, after stress annealing of the non-oriented silicon steel strip obtained after incomplete recrystallization annealing, a stator core manufactured from the steel strip is quite excellent in magnetic performance, i.e., the magnetic level of the stator core product after stress annealing is equivalent or even superior to that of a traditional full-process product.

The invention provides a preparation method for a molecular imprinting material and the molecular imprinting material prepared through the preparation method. The preparation method comprises the steps that silicon oxide is coated on the surfaces of magnetic ferroferric oxide nanometer particles, the magnetic ferroferric oxide nanometer particles are modified with gamma-(methacryloyl chloride) amino propyl trimethoxy silane to obtain magnetic ferroferric oxide nanometer particles with propenyl on the surfaces, the magnetic ferroferric oxide nanometer particles with the propenyl on the surfaces serve as carriers, estrogen receptors are simulated, functional monomers are optimized, a surface imprinting technology is adopted, and then the molecular imprinting material which can simultaneously identify seven kinds of environmental endocrine disrupting chemicals is prepared. According to the preparation method, the easy separation of a magnetic nanometer material, the good water solubility of a silicon oxide nanometer material, the specific recognition ability of molecular imprinting polymers and the surface imprinting technology are mutually combined, the preparation technology is simple, the conditions are mild, the prepared molecular imprinting material is large in adsorption capacity, fast to respond, high in magnetism, good in chemical stability and high in repeating utilization rate, and the problems that at present, multiple trace, steroid and phenol environmental endocrine disrupting chemicals are difficult to simultaneously identify, separate and enrich are solved.

A synchronous motor includes a stator, a rotor and permanent magnets. The rotor includes a rotor iron core and rotatable relative to the stator, a plurality of conductor bars accommodated within corresponding slots in the rotor iron core. The conductor bars have their opposite ends shortcircuited by respective shortcircuit rings to form a starter cage conductor. The rotor also has a plurality of magnet retaining slots defined therein at a location on an inner side of the conductor bars, in which hole permanent magnets are embedded.

A vibratory exercise apparatus capable of providing a sufficient vertical movement force is provided, which adopts a structure that a bobbin coil connected with a vibration plate is employed in a magnetic gap of a magnetic circuit using a permanent magnet which can generate a strong magnetic force. The vibratory exercise apparatus includes a magnetic gap type vertical vibrator which generates vertical vibration by a permanent magnet and a bobbin coil, a bobbin guide which is installed at the center of a yoke, a bobbin guide rod which is reciprocally movably coupled with the bobbin guide and whose one end is coupled with the upper portion of a bobbin, a joint whose one end is coupled with the upper portion of the bobbin, a vibration plate which is coupled with the other end of the joint, a guide which guides vertical movement of the vibration plate, and a spring which limits a range of movement of the vibration plate and absorbs impact when the vibration plate descends.

The invention discloses a CoFe2O4/N/C hollow nanosphere and preparation and application thereof. The preparation comprises: complexing dopamine with cobalt and iron metal ions under the condition of pH8-9 on a template as a SiO2 nanometer sphere to form a polymer shell layer, carbonization annealing to form N-doped carbon material loaded with CoFe2O4 metal nanoparticles, and finally, removing the SiO2 template with strong alkali to obtain CoFe2O4/N/C hollow nanosphere. In the invention, the N/C matrix hollow structure is prepared by using the SiO2 nanosphere as the sacrificial template, theCoFe2O4/N/C hollow nanosphere has a relatively large specific surface area and porosity, and can improve the distribution of CoFe2O4 nano metal particles loaded on the shell layer, enhance adsorption and catalytic activity on organic pollutants in waste water, and broaden the pH application range; the CoFe2O4/N/C hollow nanosphere can be recycled due to magnetic performance, thus saving resources.

The invention discloses a preparing method of SmCo7 permanent magnet alloy whose grain size is smaller than 20nm, the RE, Co, Fe, Cu, T whose fineness is bigger than 99. 9% is mixed together just as proportion of RE(CobalFexCuyTw)z and placed in the induction furnace, the alloy ingoting which is after the fusion is cased into the quartz tube equipped with nozzle at the bottom to be melt, ejected to the surface of copper roller which is tail-wagging via the nozzle at the bottom of the quartz tube to form amorphous state alloy belt, the film belt obtained is airproofed in the quartz tube, then it is placed to the microwave welding furnace for crystal process, the temperature and time range of crystal process in the microwave welding furnace is 400-900deg.C and 10min-180min, then it is placed into water for cooling. The craftwork of the invention is simple, the cost is low, the grain size of nanometer crystal magnet which includes SmCo7 main phase is about 20nm, and it is lower than grain size obtained by general heat treatment method, the exchange coupled function between grains is increased greatly.

The invention supplies a method used to produce orientation silicon steel by low temperature heating. It includes the following steps: heating the plate blank under 1280 degree centigrade; hot rolling; once or double cold rolling to gain finished product sheet thickness; nitriding treatment; decarburizing annealing; coating insulator; high temperature annealing. In the nitriding technology, heating area dew point is controlled at -15-40 degree centigrade. The invention has the advantages of high nitriding efficiency, no influence from the surface oxide film, excellent MgO coat formula which makes the magnesium silicate substrate have good magnetic property, ensure the implementation for the next hot leveling annealing and insulating coating.

The invention discloses an insulative adhesive for preparing a metallic and soft magnetic composite material and a using method thereof. The insulative adhesive disclosed by the invention is a nano-modified organic silicon resin insulative adhesive which comprises organic silicon resin and an inorganic nano dispersion liquid. The insulative adhesive greatly improve the heat-resisting temperature of the organic silicon resin and improve the mechanical strength of a magnetic powder core, is reasonable in component selection and good in using effect and has a good insulative adhering effect to Fe-based, nickel-based and metallic soft magnetic powder of other metals. The magnetic powder core prepared by the insulative adhesive prepared by the invention has excellent magnetic performance and mechanical performance.

The invention discloses a preenrichment-three segment suspension roasting-magnetic separation treatment method of complex refractory iron ores, and belongs to the technical field of mineral processing. The method comprises the following steps: 1, levigating the complex refractory iron ores, carrying out weak magnetic separation, and carrying out strong magnetic separation on mine tailings; 2, putting concentrate obtained after strong magnetic separation in a suspension roasting furnace, and heating to 450-800DEG C in a suspension state in order to carry out pre-oxidation roasting; 3, introducing nitrogen to displace air, and introducing a reducing gas to carry out reduction in a suspension loose state; 4, introducing air when the temperature decreases to 250-400DEG C in order to oxidize, taking out the obtained material when the temperature decreases to below 100DEG C, and carrying out ore milling; and 5, carrying out third segment magnetic separation, and mixing concentrate obtained after three segment magnetic separation with concrete obtained after the weak magnetic separation to obtain finial concentrate. The method has the advantages of simple process, improvement of the recovery rate of the complex refractory iron ores, strong adaptability, safe and reliable process, uniform and stable product quality, energy saving and consumption reduction.

The invention relates to a magnetic cation exchange resin catalyzer and a preparation method and application thereof. In the method, nanometer magnetic metal oxide and long-chain fatty acid are mixed in the water the pH of which is 9-12, the pH is regulated to 4-5, and modified nanometer magnetic particulate is obtained after the nanometer magnetic metal oxide and the long-chain fatty acid react; monomer, evocating agents, crosslinking agents and pore-foaming agents are mixed with the modified nanometer magnetic particulate which accounts for 5-65% of the total weight of the monomer and the crosslinking agents, magnetic resin is obtained after polymerization, and the catalyzer is obtained through sulphur reaction of the magnetic resin. The catalyzer can be used for catalyzing olefin hydration reaction, ether hydrolysis reaction, esterification reaction, etherealization reaction, condensation reaction or aromatic hydrocarbon alkylation reaction in a magnetic reactor.

The invention relates to a production method of high magnetic induction oriented silicon steel, comprising the steps of smelting, continuous casting, hot rolling, normalization, decarbonization and annealing, MgO coating, high-temperature annealing and insulation coating, wherein the normalization comprises the steps that: normalization is carried out on a hot rolling plate, nitridation is finished synchronously, the temperature of normalization and nitridation is 1050-1150 DEG C, the atmosphere is 5-35% NH3 (volume percentage), and the balance of gas is N2; after the normalization and nitridation, the N content nitrided into the hot rolling plate is 60-250ppm; and normalization cooling is carried out, the initial temperature of fast cooling is 700-950 DEG C, and the fast cooling speed with the temperature of being reduced to 550 DEG C is 15-40 DEG C/sec. The production method solves the problem of difficult nitridation in the decarbonization procedure when a low-temperature plate blank heating technology is used for producing the high magnetic induction oriented silicon steel, carries out synchronous nitridation on the hot rolling plate in the normalization procedure, and leads the following procedure of decarbonization and annealing techniques to be simplified and easily controlled, thus not only being capable of obtaining a high magnetic induction oriented silicon steel product with excellent performance and simultaneously leading the production cost to be reduced.

A panel with a bracket is used to install a component to a wallboard. The panel is inserted into an opening to a wallboard, and the junction between the panel and the wallboard is taped and spackled so that the wallboard and panel appear to be a single object. When the component is fully coupled to the bracket, the front of the component is slightly recessed from the front of the panel. A component cover could then be inserted into the newly created recess so that the component appears to be completely flush with the wallboard.