23results about How to "Improve magnetism" patented technology

A method for preparing a highly oriented anisotropic bonded magnet belongs to the field of magnetic material preparation technology. The preparation method is as follows: First, a binder is dissolved in a solvent to form a homogeneous and stable solution. Then, surface-pretreated anisotropic magnetic powder is added to the solution. Next, the magnetic powder / binder solution is placed in a ball mill jar for ball milling to refine the powder, ensuring uniform dispersion and achieving better calendering orientation anisotropy. Finally, an extractant is added while vacuum filtering the ball-milled suspension, causing the magnetic powder / binder composite to precipitate as a pre-oriented precipitate. The precipitate is crushed, sieved, and then calendered. During calendering, the pre-oriented magnetic powder / binder composite undergoes further mechanical orientation, thereby preparing an anisotropic bonded magnet with a higher degree of orientation.

The application discloses a magnesium-based composite material and a preparation method and application thereof. The magnesium-based composite material comprises ferroferric oxide and a magnesium alloy. The magnesium alloy comprises the following components in percentage by weight: 3wt.%-6wt.% of Zn, 0.3wt.%-0.8wt.% of Ca, and the rest of Mg and inevitable impurities. The magnesium-based composite material can effectively solve the problem that micron-sized particles are easy to agglomerate in a metal liquid when the magnesium alloy is modified, and the plasticity of the alloy is reduced and the alloy is not easy to be formed.

This invention belongs to the field of permanent magnet materials technology, specifically relating to a high-lanthanum-cerium NdFeB sintered permanent magnet and its preparation method. The raw materials for preparing this high-lanthanum-cerium NdFeB sintered permanent magnet include alloy one and alloy two. The chemical formula of alloy one is [(PrNd)]. 1‑x (RL) x ] a (TM) b (HM) c B d Fe 100‑a‑b‑c‑d Given the following conditions: 0.3 ≤ x < 1, 29.5 ≤ a ≤ 32.5, 0 < b ≤ 5, 0 < c ≤ 0.8, 0.85 ≤ d ≤ 1.1, the chemical formula of the alloy component II is (PrNd). a1 Ga b1 Fe 100‑a1‑b1 70≤a1≤90, 0<b1≤20. By combining alloy one and alloy two, and combining them with appropriate sintering and aging processes, high lanthanum-cerium NdFeB sintered permanent magnets are obtained, achieving surface magnetic hardening of high lanthanum-cerium main phase grains.

This invention belongs to the field of copper alloy material design and preparation technology, and discloses a new process for efficiently designing high-performance copper-iron alloys. Based on the 5% Fe content vertical cross-sectional characteristics of the Cu-Fe-Si ternary phase diagram, the Si content is designed in stages (0-4%) to achieve targeted performance optimization. Combined with a three-stage heat treatment process of "homogenization-basic aging-gradient aging", a closed-loop system of "phase diagram design-preparation-detection-optimization" is constructed. Through precise composition control by EPMA and real-time feedback of mechanical properties, the problems of blind composition design and insufficient precipitation of strengthening phases in traditional processes are solved. The resulting alloy has excellent tensile strength, yield strength, and total elongation at break, with synergistic improvement in mechanical and magnetic properties, and a design efficiency improvement of more than 40%, making it suitable for electronic, mechanical and other fields.

This invention provides a rotor lamination, a rotor structure, and a permanent magnet motor. The rotor lamination has: multiple magnetic slots, which are sequentially spaced along the circumference of the rotor lamination; multiple recesses, all located on the edge of the rotor lamination and sequentially spaced along the circumference of the rotor lamination, wherein at least a portion of any recess is located between two adjacent magnetic slots along the circumference of the rotor lamination; and multiple grooves, each corresponding to one of the recesses, wherein any groove is located at the bottom of its corresponding recess and is recessed towards the interior of the rotor lamination. The rotor structure of this invention solves the technical problem of easy breakage of the magnetic isolation bridge between adjacent magnetic poles in related technologies.

The application discloses a semiconductor-dielectric-conductor type attenuation porcelain and a preparation method thereof, and relates to the technical field of electromagnetic wave absorption and attenuation materials. The attenuation porcelain is composed of a semiconductor phase, a dielectric phase, a conductor phase, a sintering aid and a binder; the conductor phase has a core-shell structure of a nickel-cobalt-cerium alloy solid solution inner core, a nitrogen-doped amorphous carbon intermediate layer and a silicon dioxide shell, and cerium atoms are doped in the nickel-cobalt alloy solid solution lattice in the form of lattice distortion. The preparation method comprises the following steps: preparation of a precursor solution, limited silicon dioxide coating, limited in-situ reduction and defect construction, mixing and forming, and high-temperature sintering. Through the synergistic effect of the semiconductor phase, the dielectric phase and the core-shell conductor phase, the application realizes comprehensive enhancement of impedance matching, interface polarization, conductive loss and multiple scattering attenuation, and can improve the high-temperature stability and electromagnetic wave attenuation performance of the attenuation porcelain.

The invention relates to a rotor punching sheet, a rotor structure, a permanent magnet motor and a pump, the pump comprises the permanent magnet motor, the permanent magnet motor comprises the rotor structure, the rotor structure comprises a rotor core and a permanent magnet, the rotor core is formed by rotating and laminating a plurality of rotor punching sheets, and each rotor punching sheet comprises an eccentric arc sheet, a magnetic leakage bridge and a punching sheet main body. P cavities are formed in the punching sheet body at intervals in the circumferential direction, an eccentric arc sheet is arranged in each cavity, the cavities are connected with the corresponding eccentric arc sheets through magnetic leakage bridges, asymmetric V-shaped magnetic steel grooves are formed between the eccentric arc sheets and the corresponding cavities, and the magnetic leakage bridges are located at the ends or corners of the magnetic steel grooves. The rotor iron core is formed by rotating and laminating the rotor punching sheets, so that the permanent magnets at different positions of the magnet grooves are alternately distributed, and the asymmetric V-shaped magnetic steel grooves are adopted, so that the strength of the rotor structure can be ensured, the magnetic leakage amount of the rotor structure can be reduced, and the use cost of the permanent magnets is reduced; and the manufacturing cost of the permanent magnet motor and the pump is also reduced.

The invention relates to a sulfydryl silicon dioxide coated magnetic biochar material, a preparation method thereof and an application of the sulfydryl silicon dioxide coated magnetic biochar material in adsorbing and removing cadmium ions, the material takes biochar prepared from aquaculture byproducts as a substrate, and Fe3O4 magnetic particles, a silicon dioxide coating layer and a sulfydryl functional group are loaded in sequence. The method comprises the following steps: firstly, synthesizing magnetic biochar containing SiO2-coated Fe3O4 particles on the surface by a coprecipitation method under an alkaline condition, and then carrying out sulfydryl modification on the magnetic biochar by a grafting method to finally prepare the sulfydryl-modified silicon dioxide-coated magnetic biochar adsorbent. The adsorbent prepared by the method has the characteristics of high specific surface area, abundant pore structures, a large number of sulfydryl active groups and the like, shows high adsorption capacity and good selectivity on cadmium ions in water, and can be conveniently separated and recycled through magnetism. The material can also be used for adsorbing lead, copper, zinc, chromium and other heavy metal ions, the preparation process is simple, and the material has wide application prospects in the field of heavy metal wastewater treatment.

The invention relates to a method for producing sodium aluminate and iron-nickel alloy by mixing and roasting red mud and laterite-nickel ore with low aluminum-silicon ratio by using aluminum powder as a reducing agent, which comprises the following steps of: adding metal aluminum powder coated with an aluminum-oxygen binder as the reducing agent into a mixture of the red mud and the laterite-nickel ore, uniformly stirring, adding water and carbon dioxide, quickly and uniformly stirring, preparing into particles, and roasting, thereby obtaining the sodium aluminate and iron-nickel alloy. After roasting, grinding into powder, carrying out magnetic separation to obtain powder containing iron and nickel, and carrying out electric melting to prepare iron-nickel alloy; and adding sodium carbonate and calcium carbonate into the iron-free nickel powder separated by magnetic separation, stirring, then carrying out electric melting sintering, adding a sodium hydroxide solution into the sintered solid, grinding together, and carrying out solid-liquid separation after grinding to obtain a liquid which is a sodium aluminate solution. The method solves the problem that the aluminum-silicon ratio of the laterite-nickel ore in the roasting process is too low, so that nickel recovery is affected, the nickel oxide and iron oxide low-magnetic goethite structure and the aluminum oxide and silicon oxide mullite structure are changed, the recovery rate of iron, nickel and aluminum oxide is greatly increased, no waste liquid or solid waste is discharged, and the method has the advantages of energy conservation and consumption reduction at low roasting and sintering temperature.

The present application relates to sintered Nd-Fe-B magnet preparation technical field, more specifically, the present application relates to a kind of recycled sintered Nd-Fe-B magnet, it is characterized in that;The recycled sintered Nd-Fe-B magnet is prepared by composite magnetic powder by magnetic field forming, sintering and aging, the composite magnetic powder is obtained by mixing the recycled magnetic powder and conventional neodymium iron boron double alloy powder according to mass ratio 20%-40%:60%-80%;Wherein, the recycled magnetic powder is derived from waste sintered Nd-Fe-B magnetic block, is prepared by gas atomization powder processing process, particle size D50 is 3.0 μm-4.5 μm, oxygen content≤300ppm;The present application aims at realizing the resource recycling of waste magnetic block, while ensuring that magnet has low heavy rare earth dependence, high magnetic performance and high stability.The magnet is prepared by mixing the recycled magnetic powder and conventional neodymium iron boron double alloy powder according to specific proportion, recycled magnetic powder is obtained by waste magnetic block by gas atomization powder processing, and conventional neodymium iron boron double alloy powder is designed by multi-element component optimization.

The utility model discloses an anti-cracking injection molding magnetic ring assembly which comprises an injection molding magnetic ring body and a metal installation ring, the metal installation ring comprises a connecting ring and an installation ring, the installation ring is arranged at one end of the connecting ring, the end face of the connecting ring is connected with the injection molding magnetic ring body, and the installation ring is connected with the injection molding magnetic ring body. The end face of the connecting ring is provided with a plurality of embedded blocks which are arranged in an annular array and embedded into the injection molding magnetic ring body. According to the utility model, the end face of the connecting ring is provided with the ten embedding blocks which are arranged in the annular array and are embedded into the injection molding magnet ring body, so that the injection molding magnet ring body is connected with the metal mounting ring, the connecting strength is ensured, and the injection molding magnet ring body and the metal mounting ring are prevented from rotating or falling off from each other.

This invention discloses a magnetic composite material, its preparation method, and magnetic devices prepared using the same, belonging to the technical field of bonded magnetic composite materials. The invention provides a magnetic powder comprising 0.5-4.5 wt.% lanthanum, 5.0-9.0 wt.% cerium, 2.5-4.0 wt.% praseodymium, 9.0-16.0 wt.% neodymium, 1.0-4.0 wt.% zirconium, 0.1-1.0 wt.% aluminum, 0.5-1.5 wt.% boron, with the remainder being iron (Fe). It also provides a magnetic composite material comprising 83-93 parts of the magnetic powder, 0.2-2 parts of a coupling agent, 7-17 parts of a resin polymer, 0.5-3 parts of a polymeric elastomer, and 0.1-0.5 parts of a lubricant. The magnetic composite material disclosed in this invention, when applied to magnetic devices, possesses characteristics such as low cost, low thermal demagnetization, high magnetic properties, and excellent mechanical and processability, meeting the requirements for magnetic devices in thermal management systems.

This invention provides a soft magnetic high-entropy alloy with both high strength and ductility, its preparation method, and its applications. The general formula of the soft magnetic high-entropy alloy with both high strength and ductility is Fe. a Co b Ni c Al d Nb e B f The composition is as follows: 30% ≤ a ≤ 45%, 30% ≤ b ≤ 40%, 15% ≤ c ≤ 25%, 2% ≤ d ≤ 10%, 2% ≤ e ≤ 10%, 0.01% ≤ f ≤ 1%, and a + b + c + d + e + f = 100%, where a, b, c, d, e, and f are the molar percentages of the corresponding elements. This invention's soft magnetic high-entropy alloy possesses both excellent strong plasticity and soft magnetic properties. Its saturation magnetization (Ms) exceeds 130 emu / g, coercivity (Hc) is less than 3.00 Oe, room temperature tensile yield strength reaches 1000 MPa, tensile strength reaches 1300 MPa, and elongation after fracture reaches 40%, with comprehensive performance far exceeding most soft magnetic alloys.

This application discloses a complete production method for ultra-thin high-grade non-oriented silicon steel and its acid continuous rolling combined with 20-roll precision cold rolling. The thickness of the non-oriented silicon steel is (0.05~0.15)±0.002mm. The production method includes: heating: homogenization temperature 1000~1140℃; hot rolling: the initial rolling temperature of the first finishing rolling pass ≥950℃, the final rolling temperature of the last finishing rolling pass 850±15℃, and the hot-rolled plate thickness 1.80~2.30mm; coiling temperature 630±15℃; pickling and continuous cold rolling: pickling and multi-pass continuous cold rolling are performed using a multi-stand pickling and continuous cold rolling mill, and the hardened plate thickness is 0.2~0.35mm; normalizing the hardened plate: normalizing the hardened plate in a normalizing furnace to obtain a normalized hardened plate; normalizing temperature 850~950℃; 20-roll cold finishing; annealing: annealing temperature 900~1000℃, annealing time 40~120s.

The application relates to a preparation method of a magnetic lithium ion sieve coated with Fe-doped ZrO2, and relates to a preparation method of a lithium ion sieve. 3+ The application creatively adopts Fe-doping and ZrO2 coating to prepare the magnetic lithium ion sieve, simultaneously reduces the dissolution loss of manganese and iron by means of metal cation ion doping and coating, realizes efficient solid-liquid separation, greatly increases the service life of the lithium ion sieve, and is applicable to lithium extraction from various lithium-containing solutions due to the acid and alkali resistance of ZrO2. The method comprises the following steps: 1, preparing FO; 2, preparing LMFO; 3, preparing ZrO2@LMFO; and 4, preparing ZrO2@HMFO. The process is simple in preparation, the dissolution loss of manganese and iron tends to be stable in multiple cycles, the magnetic separation performance is good, the process is applicable to mass production, and is helpful to the industrialization progress of lithium extraction from salt lake brine.

This application belongs to the field of additive manufacturing technology, specifically a high-performance Alnico permanent magnet and its preparation method and system. The preparation method includes the following steps: using Alnico alloy powder as raw material, preparing an Alnico permanent magnet blank using selective laser melting, and controlling the process parameters of selective laser melting to ensure that the temperature gradient of the molten pool in a specific direction is ≤2.0×10⁻⁶. 7 K / m, and cooling rate ≤ 3.0 × 10 6 K / s, a specific direction perpendicular to the laser scanning plane and passing through the center of the molten pool; the Alnico permanent magnet blank is homogenized, subjected to magnetic field heat treatment, and tempered to obtain the Alnico permanent magnet. This application successfully achieved SLM forming of high-density, low-defect Alnico permanent magnets by precisely controlling the thermal history of the molten pool; it also has important reference and promotion value for the SLM forming of other high-entropy alloys, copper alloys, and other multi-component alloys with significant differences in element melting points and prone to segregation.

The application discloses a neodymium-iron-boron magnet based on grain boundary diffusion for improving magnetic properties and a preparation method thereof. The preparation method comprises the following steps: mixing neodymium-iron-boron magnetic powder, a lubricant and nanotubes or micropipes to obtain mixed magnetic powder; performing orientation compression molding, isostatic pressing and vacuum sintering on the mixed magnetic powder to obtain a diffusion base material; cutting the diffusion base material according to size requirements, grinding off a surface oxide layer, and cleaning to obtain a cleaned base material; uniformly spraying an alloy diffusion source on the surface of the cleaned base material to perform grain boundary diffusion to obtain a magnet; and performing secondary tempering treatment on the magnet to obtain a grain boundary diffusion magnet. In the method, nanotubes or micropipes are added into the neodymium-iron-boron magnetic powder, diffusion channels penetrating through the grain boundaries are formed in the sintering process, and then the magnet is subjected to grain boundary diffusion by using a rare earth alloy diffusion source, so that the grain boundary diffusion depth of heavy rare earth elements is significantly improved, and the magnetic properties of the magnet are improved. The neodymium-iron-boron magnet prepared by the method has excellent performance.

Disclosed in the present invention are a samarium-based rare earth permanent magnet material, and a preparation method therefor and an application thereof. In the samarium-based rare earth permanent magnet material Sm2FeαCuβVγMoδNε, 11.5 ≤ α ≤ 17.5, 0.1 ≤ β ≤ 0.4, 1.0 ≤ y ≤ 1.8, 0 ≤ δ ≤ 1.0, and 2.9 ≤ ε ≤ 4.0. According to the samarium-based rare earth permanent magnet material provided by the present application, a good balance of the remanence and the coercivity is promoted by doping with vanadium, copper, and molybdenum and adjusting to an appropriate atomic ratio range, such that the samarium-based rare earth permanent magnet material has excellent comprehensive magnetic performance. The preparation method provided by the present application is simple to operate, low in cost, and suitable for the fields of small and special motors, magnetic sensors, or audio equipment.

The RLD-20 single-phase induction type voltage stabilizer comprises a stator and a rotor, the stator comprises a stator block formed by overlapping silicon steel sheets, a stator coil is wound on the stator block, the stator coil is connected with a control circuit board through a wire, and the stator is fixedly installed on a rack; the rotor comprises a rotor block formed by overlapping silicon steel sheets, a rotor coil is wound on the rotor block and connected with the control circuit board through a wire, the rotor is further connected with a rotating shaft of the servo motor, the servo motor drives the rotor to rotate, and the servo motor is further connected with the control circuit board through a wire. The control circuit board is further provided with a voltage induction connector. The silicon steel sheet prepared through the method is low in iron loss and high in magnetic induction intensity value, and the requirement for the magnetic performance of the silicon steel sheet in the voltage stabilizer can be met. And the magnetic performance of the silicon steel sheet can be further improved by improving the treatment method of the silicon steel.

This invention discloses an adsorbent based on MOF materials and its processing technology, belonging to the field of adsorbent technology. The process includes the following steps: adding zirconium-based MOF-Fe3O4 to DMF, ultrasonically mixing, adding terephthalaldehyde, mixing, adding acetic acid, reacting at room temperature for 48-72 h, magnetically separating the precipitate, washing, and vacuum drying to obtain aldehyde-based zirconium-based MOF-Fe3O4; placing chromium nitrate nonahydrate and terephthalic acid in DMF, stirring and mixing, adding modified SBA-15, reacting at 180-220℃ for 12-24 h, cooling and filtering, washing and drying to obtain chromium-based MOF-SBA-15; adding aldehyde-based zirconium-based MOF-Fe3O4 and chromium-based MOF-SBA-15 to ethanol, adding acetic acid, reacting at room temperature, magnetically separating, washing and drying to obtain the MOF-based adsorbent. The MOF-based adsorbent prepared by this invention can be applied to the concentration and treatment of typical industrial VOCs waste gas.

This invention discloses a core-shell Sm-Fe-N alloy and its preparation method, wherein the core of the core-shell Sm-Fe-N alloy is Sm2Fe. 17 N b The outer shell is Sm 2( Fe a M 1‑a ) 17 N b M is selected from at least one of Mn, Co, Cr, or Ti, where 0.5 ≤ a ≤ 0.95 and 2.5 ≤ b ≤ 3.5. This invention first prepares Sm₂Fe using physical or chemical methods. 17 The alloy is a mixture of M-O or Sm2Fe with a surface coating of M-O. 17 The alloy is further reduced and diffused to form Sm2Fe 17 A thin Sm-Fe-M layer is formed on the alloy surface, followed by nitriding. This invention yields a high-heat-resistant and high-oxidation-resistant samarium-iron-nitrogen core-shell alloy through surface modification. By introducing metallic M into the outer shell layer, it overcomes the problem of reduced saturation magnetization caused by overall doping with metallic M, and also improves the Sm2Fe... 17 Magnetic properties of N3 at high temperatures.

The invention discloses a magnetic nano composite material for adsorbing precious metal ions as well as a preparation method and application thereof, and belongs to the technical field of precious metal recovery. The magnetic nano composite material disclosed by the invention is composed of Fe, FeS, a carbon layer and porous carbon, the Fe, the FeS, the carbon layer and the porous carbon have nanoscale sizes and structures; the magnetic nano composite material has the following structure: embedded nanospheres are uniformly distributed in a network structure formed by porous carbon; the nanosphere has a core-shell structure, the core is Fe, the shell is FeS, and the nanosphere is wrapped with a carbon layer. The magnetic nano composite material can highly selectively adsorb more than 99% of Au (III), Ag (I) and Pd (II) from more than 20 kinds of metal ions within 10 min, and precious metal separation can be rapidly achieved in a mode of externally applying a magnetic field.

The invention discloses low-iron-loss non-oriented electrical steel for an electric vehicle motor and a processing method thereof, and relates to the technical field of non-oriented electrical steel, and the low-iron-loss non-oriented electrical steel comprises the following components in percentage by weight: 3.0-3.8% of Si, 0.25-0.35% of Als (% of Si), 0.40-0.55% of Mn (% of Si), less than or equal to 0.1% of P, less than or equal to 0.2% of N, less than or equal to 0.003% of C, less than or equal to 0.004% of C + Ti, less than or equal to 0.02% of S, and the balance of Fe and inevitable impurity elements. Through the gradient structure design of fine equiaxed grains on the surface layer and thick equiaxed grains on the core part, the high and low frequency working conditions of the electric vehicle driving motor are accurately matched. Under low frequency, the magnetic hysteresis loss is obviously reduced by coarse grains at the core part; under high frequency, surface layer fine grains improve resistivity by utilizing skin effect, eddy current loss is effectively inhibited, iron loss P1.5 / 50 is less than or equal to 2.35 W / kg, P1.0 / 400 is less than or equal to 14.00 W / kg, and P1.0 / 1000 is less than or equal to 38.0 W / kg, a cold rolling process adopts different-diameter rolling core design, and a gradient energy storage and grain structure can be formed through dynamic matching of the roller diameter of an upper working roller and the reduction rate of the current pass without additional nitriding and other complex processes.