209results about How to "Improve magnetic properties" patented technology

The invention belongs to the technical field of soft magnetic materials, and discloses an amorphous nanocrystalline soft magnetic material with high saturation flux density and a preparation method thereof. The preparation method comprises the following steps that an iron-based amorphous strip is crushed into flat powder with the thickness being 5-25 microns and the diameter being 30-80 microns, and scaly amorphous soft magnetic powder is obtained; the method comprises the following steps: performing insulation coating treatment on spherical iron-silicon soft magnetic powder with the average particle size of 2-20 microns to obtain insulation coating modified spherical magnetic powder; and mixing the obtained scaly amorphous soft magnetic powder, the insulating coated modified spherical magnetic powder and bonding resin, performing compression molding, performing annealing crystallization treatment at the temperature of 450-550 DEG C, and then raising the temperature to 600-900 DEG C for sintering treatment to obtain a finished product. According to the amorphous nanocrystalline soft magnetic material and the preparation method thereof, the spherical iron-silicon soft magnetic powder modified through insulation coating is compounded with the scaly amorphous soft magnetic powder, and low loss is maintained while the obtained amorphous nanocrystalline soft magnetic material Bs is remarkably improved.

The invention discloses a low-cost high-cerium neodymium iron boron diffusion magnet and a preparation method and application thereof, and relates to the technical field of rare earth permanent magnet materials. Comprising the steps that a neodymium iron boron alloy casting piece Ce30 with the Ce content being 10 wt% and a neodymium iron boron alloy casting piece Ce50 with the Ce content being 15 wt% are prepared through burdening and smelting, after the Ce30 and Ce50 neodymium iron boron alloy casting pieces are evenly mixed, hydrogen decrepitation, jet milling, oriented pressing, cold isostatic pressing and vacuum sintering are sequentially carried out, and a high-cerium sintered neodymium iron boron matrix is obtained; carrying out grain boundary diffusion on the high-cerium sintered neodymium-iron-boron matrix to obtain a high-cerium neodymium-iron-boron diffused magnet; the performance of the blank prepared through the method is close to the N40 mark, the performance of the magnetic sheet after diffusion reaches the 38MT mark, the magnetic performance is kept at the high level, the Ce content is high, efficient utilization of the high-abundance element cerium is achieved, the production cost of the rare earth permanent magnet material is greatly reduced, industrial batch production can be achieved, and balanced utilization of rare earth resources is promoted.

The invention belongs to the technical field of super-hydrophobic materials, and particularly relates to a preparation method and application of magnetic response multifunctional super-hydrophobic biomass aerogel. The super-hydrophobic PDMS-coated CMIL-101 / CS aerogel is prepared by combining chitosan (CS), a magnetic porous carbon material (CMIL-101) and polydimethylsiloxane (PDMS) through a freeze drying technology, so that efficient oil-water separation and organic pollutant microplastic removal are realized. The aerogel utilizes magnetic response and photo-thermal characteristics, promotes oil adsorption and treats high-viscosity oil in a magnetic field, simplifies the purification process, and has important application value for water body remediation.

The invention relates to a high-frequency and high-performance iron-nickel alloy magnetic powder core and a preparation method and application thereof, belongs to the field of metal magnetic powder cores, and solves the problems that in the prior art, when a metal magnetic powder core is applied at high frequency, high magnetic conductivity, high magnetic conductivity stability and high quality factor are difficult to consider, and the saturation flux density is low. And the preparation process is tedious. The invention discloses a preparation method of a high-frequency high-performance iron-nickel alloy magnetic powder core. The preparation method comprises the following steps: S1, preparing raw materials; s2, performing pretreatment; s3, the pretreated iron-nickel alloy powder and nano SiO2 powder are blended, and inorganic insulation coating powder is obtained; s4, adding the inorganic insulating coating powder into a first coating agent to obtain inorganic and first organic insulating coating powder; s5, adding the inorganic and first organic insulation coating powder into a second coating agent to obtain inorganic and double-layer organic insulation coating powder; and S6, compression molding. The comprehensive magnetic performance of the iron-nickel magnetic powder core is improved, and the preparation process is simplified.

The invention belongs to the field of rare earth magnetic materials, and particularly relates to a rare earth high-entropy alloy, an annular magnet and a preparation method of the rare earth high-entropy alloy. The invention discloses a rare earth high-entropy alloy, the component of which is (HEA-Re) 2Fe14B, HEA-Re is more than four of rare earth elements La, Ce, Pr, Nd, Y, Gd, Ho, Dy and Tb, and the content proportions of the rare earth elements are the same; meanwhile, the invention discloses a preparation method for preparing the annular magnet by adopting the rare earth high-entropy alloy through the steps of smelting, solution rapid quenching, annealing heat treatment, magnetic powder preparation, magnet pre-forming, hot pressing, thermal deformation and the like, and the prepared annular magnet. According to the annular magnet prepared through the components and the method, the magnetic performance and the mechanical performance are obviously improved, the content of high-price rare earth elements is reduced, and the cost is effectively saved.

The invention discloses a multi-metal borate nano-particle as well as a preparation method and application thereof. The preparation method comprises the following steps: in the presence of small molecules with alkyl chains, performing high-temperature thermal decomposition on an organic metal compound or a metal salt compound precursor and organic borate in a solvent, and then centrifuging, modifying, performing ultrafiltration, dialyzing and purifying to obtain the multi-metal borate nanoparticles. The preparation method disclosed by the invention has the characteristics of mildness, high efficiency and strong controllability. The multi-metal borate nanoparticles prepared by the preparation method disclosed by the invention have the advantages of monodisperse size, relatively high magnetic property and good biocompatibility. Therefore, the prepared multi-metal borate nanoparticles not only have multi-modal imaging functions such as magnetic resonance imaging, near-infrared two-region imaging, nuclear medicine imaging and magnetic particle imaging, but also can be used for various treatment means such as magnetocaloric therapy and boron neutron capture therapy; potential advantages are realized in biomedical applications such as magnetic targeting tumor treatment and imaging contrast agents, and high practical values are realized.

The invention discloses a low-boron high-coercivity neodymium-iron-boron permanent magnet and a preparation method thereof, and belongs to the technical field of permanent magnets, the preparation method of the permanent magnet comprises the following steps: taking Pr, Fe, Cu and Ga as raw materials, smelting the raw materials through a vacuum melt-spinning furnace to obtain a Pr65Cu25 melt-spinning sheet and a Pr65Fe30Ga5 melt-spinning sheet, grinding the melt-spinning sheet through a three-head grinder to obtain Pr65Cu25 alloy powder and Pr65Fe30Ga5 alloy powder, and sintering the Pr65Cu25 alloy powder and the Pr65Fe30Ga5 alloy powder to obtain the low-boron high-coercivity neodymium-iron-boron permanent magnet. Under the protection of argon or nitrogen, mixing the two to obtain additive phase powder; the low-boron neodymium-iron-boron magnet raw materials are adopted to prepare the main phase alloy powder, and the Pr, Fe, A < l >, Cu and Ga raw materials are adopted to prepare the additive phase powder, the additive phase powder is added into the main phase alloy powder, a lubricating agent is added, and mixing, grinding, compression molding, isostatic pressing treatment, sintering and tempering treatment are conducted to obtain the low-boron neodymium-iron-boron magnet. And the obtained neodymium iron boron permanent magnet has relatively high coercive force and magnetic performance.

The invention relates to the field of metal soft magnetic materials, in particular to a high-frequency high-permeability metal soft magnetic powder core and a preparation method thereof. The preparation method comprises the following steps: S1, screening magnetically soft alloy powder with a preset particle size; s2, preparing passivation powder; s3, preparing granulation powder; s4, a blank is prepared through compression molding; s5, the blank piece is subjected to curing treatment; and S6, the cured part is subjected to high-temperature heat treatment in vacuum, and the high-frequency and high-permeability metal soft magnetic powder core is obtained. The preparation method disclosed by the invention is simple, mild in reaction condition, low in cost and capable of realizing automatic large-scale production. The high-frequency and high-permeability metal soft magnetic powder core prepared by the invention has high frequency, high magnetic induction intensity and high unit power density, particularly, the internal stress of a metal soft magnetic material is released to the greatest extent by adopting high-temperature heat treatment, the coercive force is reduced, the density and the permeability are remarkably improved, and the high-frequency and high-permeability metal soft magnetic powder core is widely applied to DC-DC and power supply circuits with ultrahigh switching frequency and high magnetic conductivity. And a MHz-level power supply circuit.

The invention relates to a high-voltage-withstanding integrally-formed inductor and a preparation method thereof.The high-voltage-withstanding integrally-formed inductor comprises a magnet and a winding, the magnet is prepared from iron-based nanocrystalline and composite powder, and the iron-based nanocrystalline comprises, by weight, 10-15% of cobalt, 7-15% of nickel, 1-3.5% of manganese, 3-6% of silicon, 0.3-1% of copper and the balance iron; the composite powder comprises any one or a mixture of more of carbonyl iron, iron-silicon-chromium and iron-silicon-aluminum. The method has the effect of improving the quality of an inductor product.

The invention discloses a silicone oil-based magnetic liquid with low volatility and radiation resistance as well as a preparation method and application thereof, and relates to the technical field of nuclear reactors. The silicone oil-based magnetic liquid comprises nano magnetic particles, a modifier, a surfactant and a base carrier liquid, the nano magnetic particles are changed from water solubility to oil solubility under the action of the modifier, the surface of the nano magnetic particles modified by the modifier is coated with the surfactant, and the base carrier liquid comprises polymethylphenyl siloxane fluid. The silicone oil-based magnetic liquid prepared by the invention has the advantages of chemical inertness, thermal stability, oxidation resistance, low vapor pressure, low ignition point and the like of conventional silicone oil, also has better high temperature resistance, radiation resistance, lubricating property and dissolving property, has the working temperature of-50 DEG C to 250 DEG C, and is excellent low-volatility and radiation-resistant silicone oil-based magnetic liquid.

The invention relates to the technical field of magnetic core material processing, and particularly provides an amorphous nanocrystalline magnetic core annealing processing device and method. The device comprises a heating furnace, wherein a magnetic core placing frame capable of moving in and out is horizontally mounted in the heating furnace in a sliding fit manner; the magnetic core placing frame comprises a sliding base, a rotary bottom support is vertically and rotatably mounted on the sliding base, a plurality of magnetic core trays are detachably mounted on the rotary bottom support and are sequentially inserted and stacked up and down, and the lowermost magnetic core tray is inserted and matched on the rotary bottom support; a driving assembly for driving the rotary bottom support to rotate is assembled at the bottom of the heating furnace; according to the magnetic core feeding and discharging device, the convenience of magnetic core feeding and discharging is improved; sufficient and uniform heating of the magnetic core is facilitated; and the fluidity of hot air in the heating furnace and the heating uniformity of the magnetic core are enhanced, and the generation of temperature gradient and the formation of internal thermal stress are avoided, so that the mechanical property quality, the microstructure consistency and the good magnetic property of the magnetic core subjected to annealing treatment are ensured.

The invention discloses a method for simultaneously optimizing the squareness and the remanence temperature coefficient of a 2: 17 type samarium-cobalt sintered magnet, and belongs to the technical field of rare earth permanent magnet material preparation. A component Sm < 1-x > RE < x > (CobalFeaCubZrc) z is designed, RE is one or more of Dy, Er, Gd, Tm and other heavy rare earth elements, and a, b, c and x meet the following relations: 0 < = x < = 0.6, 0.1 < = a < = 0.2, 0.06 < = b < = 0.12, 0.02 < = c < = 0.03, and 6.9 < = z < = 7.9. On the basis of a conventional smelting and ingot casting-isothermal annealing-powder preparation-oriented profiling-sintering-solid solution-aging process, an isothermal annealing process is added after smelting and ingot casting: the temperature is raised to 1190-1210 DEG C in a tubular furnace, isothermal annealing is performed for 5-20 hours, heavy rare earth elements are eliminated, and the influence of the stability of a 2: 17H phase on the component uniformity and magnetic performance of a magnet is improved; and substitution sites of heavy rare earth can be increased, and the residual magnetism temperature coefficient is optimized.

The invention discloses a preparation method of a flexible magneto-optical composite material which is low in cost and easy to form, Fe3O4 or CoFe2O4 or NiFe2O4 nanoparticles which have a strong magneto-optical effect but are extremely easy to agglomerate are uniformly dispersed in ZIF-8 with fixed pores by adopting an in-situ symbiosis technology, and PgC5Cu is used for modifying the surface of the ZIF-8 to serve as a bridging agent, so that the ZIF-8 is uniformly dispersed in PMMA (Polymethyl Methacrylate); and the composite material with excellent magneto-optical characteristics is successfully constructed. The innovative design not only maintains the original structural stability and optical transparency of the material, but also endows the material with unprecedented flexibility and machinability, and provides possibility for realizing light weight, portability and flexibility of magneto-optical devices. Compared with traditional pure inorganic magneto-optical crystals, magneto-optical glass and other materials, the preparation method is simple, the production period is short, energy consumption and cost are remarkably reduced, and the material has the advantages of being easy to form, high in flexibility and the like and can adapt to wider application scenes.

The invention relates to the technical field of soft magnetic ferrite materials, and particularly discloses a NiCuZn-MgO composite material and a preparation method thereof. The NiCuZn-MgO composite material comprises main components and additives, and the main components comprise the following components in percentage by weight: 36-72 wt% of Fe2O3, 13-16 wt% of ZnO, 6-9 wt% of NiO, 3-6 wt% of MgO and the balance of CuO; based on the total weight of the main components, the additive comprises the following components in percentage by weight: 0.5 to 1.5 weight percent of Bi2O3, 0.3 to 1.5 weight percent of SiO2 and 0.3 to 1.5 weight percent of CaO. According to the NiCuZn-MgO composite material prepared by the invention, the cost of soft magnetic ferrite can be reduced, and the NiCuZn-MgO composite material has high magnetic conductivity and high Bs.

The present application discloses a method for preparing non-oriented silicon steel with improved magnetic properties and non-oriented silicon steel, wherein the non-oriented silicon steel comprises: Si 1.0-3.0%, Mn 0.2-0.5%, Al 0.3~0.6%, N≤0.002%, C≤0.003%, S≤0.003%, and the rest are Fe and impurities; in the preparation method, the ingot heating process includes a heating section and a soaking section, the soaking temperature of the soaking section is T=1050+[Al] / (10×[N])+[Mn] / (10×[S])+10×[Si], the soaking time is t=30+[Al] / (100×[N])+[Mn] / (100×[S])+5×[Si], the unit of T is ℃, and the unit of t is min; in the normalizing process, the normalizing temperature is 860~980℃; in the annealing process, the annealing temperature is 980~990℃, and the annealing time is 150~200s.

The invention relates to the technical field of high-performance composite materials, and provides a frequency band magnetic control adjustable one-dimensional nanotube composite wave-absorbing material and a preparation method thereof.The material is composed of a one-dimensional tubular ferroferric oxide matrix and manganous-manganic oxide wrapping the outer side of the matrix, and directional arrangement is conducted through magnetic control rotation. The preparation method comprises the following steps: preparing an iron oxyhydroxide precursor through a hydrothermal synthesis method; the preparation method comprises the following steps: reducing an iron oxyhydroxide precursor by a liquid-phase pyrolysis method, and coating a manganous-manganic oxide shell layer in situ at the same time, so as to obtain a nanotube ferroferric oxide / manganous-manganic oxide composite material; and carrying out orientation arrangement on the nanotube-shaped ferroferric oxide / manganous-manganic oxide composite material through magnetic field control. According to the preparation method and the structural design, the yield, the uniformity, the magnetic performance, the electromagnetic wave absorption efficiency, the multi-band electromagnetic loss enhancement and the like of the material are remarkably improved.

The invention discloses a magnetic titanium dioxide composite material for photocatalysis of printing and dyeing wastewater and a preparation method thereof, titanium dioxide and a magnetic matrix Fe3O4 are compounded, a transition layer SiO2 is added, core-shell type magnetic titanium dioxide is prepared, chitosan is used as a carrier and is loaded, the proportion of Fe3O4 to titanium dioxide needs to be configured, and the magnetic titanium dioxide composite material is prepared. The ratio of chitosan to titanium dioxide also needs to be configured, and the ratio of Fe3O4 to SiO2 is 1: 2, 1: 4 or 1: 6; the addition amount of Fe3O4-coated SiO2 is 8%, 6%, 4% and 2% of TiO2, namely n (Fe3O4-coated SiO2) / n (TiO2) is equal to 0.08, 0.06, 0.04 and 0.02, and the addition amount of chitosan is 5%, 10%, 20% and 50% of Fe3O4-coated SiO2-coated TiO2, namely n (CS) / n (Fe3O4-coated SiO2-coated TiO2) is equal to 0.05, 0.1, 0.2 and 0.5. Chitosan is adopted as a carrier to load a magnetic titanium dioxide composite photocatalyst with a core-shell structure, and the magnetic titanium dioxide composite photocatalyst is used for photocatalytic degradation. The adsorption capacity of the photocatalytic material is improved through chitosan, so that the surface concentration of pollutants on the catalyst is increased, the utilization rate of photo-induced electron-hole pairs is increased, and the photocatalytic performance is improved.

The invention discloses a high-strength and high-toughness R-T-B rare earth permanent magnet and a preparation method thereof. Two high-melting-point elements of Ti and Nb are synergistically added, the ratio of the two elements is adjusted, SC sheet high-temperature heat treatment, unsaturated hydrogen absorption and segmented vacuum sintering are combined, generation of a fine-size Ti3Nb phase is promoted, precipitation of a large-size high-melting-point element boride is inhibited, fine-size Ti3Nb precipitate particles have better dispersivity, and the high-melting-point Ti3Nb-based composite material is prepared. When the R-rich phase is uniformly distributed on the grain boundary of the magnet, the grain boundary phase of the magnet can be effectively enhanced, meanwhile, main phase distortion is not caused, the hardness of the magnet is reduced, the strength and toughness of the magnet are improved, and therefore the magnet with high strength and high toughness is prepared, and the magnetic performance of the magnet is improved.

The invention discloses a high-resistivity sintered NdFeB permanent magnet material and a preparation method thereof, which relates to the technical field of permanent magnet materials. The material is prepared from the following raw materials in parts by mass: 95.0-99.9 parts of base alloy fine powder, 0.1-5 parts of rare earth fluoride powder, 0.1-0.3 parts of antioxidant, 0.2-1.2 parts of lubricant, 0.2-5 parts of aviation gasoline and 0.1-0.5 parts of nanomaterial; the composition of the base alloy fine powder is (PrNd) a (TM) b (HM) c Ga d B e Fe 100‑a‑b‑c‑d‑e , 29.5≤a≤32.5, 0<b≤5, 0<c≤0.8, 0.3≤d≤0.5, 0.88≤e≤0.94, wherein TM is one or more of Al, Cu, Co, and Mn, and HM is one or more of Nb, Zr, Hf, Ti, and V. The permanent magnetic material has high resistivity and excellent comprehensive magnetic properties.

The present invention relates to the technical field of target materials and target material manufacturing, and specifically to a high-conductivity lithium phosphate sputtering target material for solid-state batteries and a preparation method thereof. The high-conductivity lithium phosphate sputtering target material for solid-state batteries of the present invention comprises the following preparation steps: raw material powder mixing, primary ball milling, calcination, secondary ball milling, and hot pressing sintering. The composite powder obtained in the preparation process has excellent sphericity, and the target material finally obtained has high density and low resistivity. When the target material is used as a sputtering target material to prepare a thin film, it can meet the requirements of solid-state batteries for the thin film in terms of conductivity.

The present invention relates to a rare earth permanent magnetic material with high temperature stability and a preparation method thereof. The rare earth permanent magnetic material with high temperature stability comprises the following chemical components by weight percentage: x Y y T z Tm a B b , wherein RE is at least one rare earth element selected from La, Ce, Pr, Nd, Gd, Tb, Dy, Ho, x is 26-30, Y is yttrium, y is 0.5-5, and x+y is 29.8-34; Tm is at least one element selected from Al, Cu, Ga, Zr, Ti, Si, a is 0.5-3; B is boron, b is 0.85-1.1; T is a combination of Fe and Co, z=100-x-y-a-b, and z contains 1-10 parts of Co; the microstructure of the high temperature stability rare earth permanent magnet material includes a main phase and a grain boundary phase, the grain size of the main phase is 2-8 μm, and the concentration of Y in the main phase presents a distribution of high grain center and low grain boundary. The obtained magnet has high temperature stability.

This application discloses a soft magnetic powder composite, a magnetic powder core material, and an insulating coating method based on organic growth, belonging to the field of soft magnetic materials technology. The soft magnetic powder composite of this application includes soft magnetic powder and an insulating coating layer, with the insulating coating layer encapsulating the soft magnetic powder. The insulating coating layer is prepared by a crosslinking reaction of dopamine hydrochloride (hereinafter referred to as dopamine) and polyethyleneimine. The soft magnetic powder is selected from metals and / or alloys containing Fe. The insulating coating method of this application has low hazard, achieves high stability within a certain temperature range, features scalable and controllable insulating film thickness, high film uniformity, and effectively isolates interparticle eddy currents. Simultaneously, the insulating coating layer has strong adhesion, reducing the amount of insulating adhesive used, facilitating molding, reducing the dilution effect of non-magnetic phases, and further improving the magnetic properties of the matrix.

The embodiment of the invention discloses a high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe and a preparation method thereof, relates to the technical field of non-ferrous metal material manufacturing, and aims to solve the technical problem of poor production in the prior art. According to the high-strength corrosion-resistant CuNi10Fe1Mn alloy copper pipe, the content of Ni ranges from 9.0% to 11.0%, the content of Fe ranges from 1.0% to 2.0%, the content of Mn ranges from 0.5% to 1.0%, the sum of impurity elements does not exceed 0.2%, and the balance is Cu.

The invention discloses a method for preparing a magnetic corrosion-resistant ceramic coating on a titanium alloy surface, and relates to a method for preparing a ceramic coating. The invention aims to solve the problem that a ceramic coating prepared on the surface of a titanium alloy by the existing micro-arc oxidation technology is non-magnetic, so that the application of the titanium alloy in the fields of clinical medical treatment, information storage, sensing and the like is limited. The method comprises the steps of 1, titanium alloy pretreatment; 2, ultrasonic oil removal; 3, preparing an iron oxalate precursor solution; 4, micro-arc oxidation I; and 5, micro-arc oxidation II. The corrosion-resistant current density of the prepared magnetic ceramic coating is reduced to 6.8 * 10 <-8 > A / cm < 2 >, and the corrosion potential is 0.02 V, while the corrosion current density of the matrix titanium alloy is 2.9 * 10 <-6 > A / cm < 2 >, and the corrosion potential is-0.68 V. Compared with the corrosion current density of the titanium alloy matrix, the corrosion current density of the magnetic ceramic coating prepared through micro-arc oxidation segmented treatment is reduced by nearly 2 orders of magnitude, the potential is positively shifted by 0.70 V, and the corrosion resistance of the magnetic ceramic coating is greatly improved. And the corrosion resistance of the titanium alloy is obviously improved.

The invention relates to the technical field of precious metal alloy material manufacturing, in particular to a process for hardening treatment of gold through micro-nano metal powder, which comprises the steps of blank charging, smelting, vacuum ingot casting, surface cleaning, rolling stretching and age hardening, product surface treatment, product welding and the like. The method has the advantages that in the aspect of material selection, the micro-nano metal powder, such as titanium powder and cobalt powder, is diversified and is small in adding amount, various strengthening mechanisms can be provided, and the economical efficiency is guaranteed. The smelting process is accurate, good vacuum and temperature control is achieved, and stirring is uniform after micro-nano metal powder is added. And rapidly solidifying the cast ingot by using a water-cooling copper mold, treating the surface by using aqua regia and the like, and drying. Midway annealing can be executed through rolling and stretching, and the process is flexible. Product manufacturing processes are diversified, and surface treatment includes polishing, electroplating, coloring and the like. Advanced modes such as laser are adopted for welding to avoid hardness reduction. According to the process, the gold hardening treatment effect and quality are improved from multiple aspects, different requirements are met, and wide application prospects are achieved.

The invention discloses a preparation method of a renewable magnetic porous carbon adsorption material. The preparation method comprises the following steps: crushing and drying a biomass carbon source serving as a raw material to obtain biomass carbon powder; the preparation method comprises the following steps: dissolving FeCl3. 6H2O in ethylene glycol, adding NaAc, transferring into a polytetrafluoroethylene reaction kettle, adding biomass carbon powder, carrying out high-temperature reaction, separation, cleaning and drying, carrying out heat treatment in a protective atmosphere to form a biomass carbonized material, and carrying out ball milling and activation on the biomass carbonized material to obtain the magnetic porous carbon adsorption material which can effectively remove pollutants. The method is low in cost and environment-friendly, and the prepared magnetic porous carbon material has a reasonable aperture structure, a high specific surface area and excellent magnetic performance and is suitable for adsorption treatment of various pollutants. The biomass carbon source is adopted as the raw material, the cost is low, regeneration is achieved, a large number of chemicals are not needed in the whole preparation process, wastewater discharge is reduced, and the green chemistry concept is met.

The invention relates to the technical field of manganese zinc ferrite and discloses a method for preparing a manganese zinc ferrite material. A composite material containing both a "conductive" element and a "magnetic" element is prepared by a physical mixing method. The manganese zinc ferrite has a large resistivity, and electromagnetic waves can easily enter the interior of the material to achieve electromagnetic impedance matching, so that the magnetic loss performance is outstanding; the polythiophene Schiff base conductive polymer can coordinate with metal ions to form a metal complex, thereby increasing the dielectric loss of the composite material and reducing the reflection of electromagnetic waves on the incident interface; the Schiff base structure transfers charges through the conjugation of single and double bonds, and the double bond electron rotation makes it magnetic, and the pinning effect of rare earth lanthanum increases the loss caused by domain wall resonance, thereby effectively improving the magnetic properties and wave absorption performance of the composite material, so that the prepared manganese zinc ferrite material has excellent properties of broadband and high conductivity.

The invention relates to the technical field of nanocrystalline magnetic sheet preparation, and discloses a nanocrystalline magnetic sheet preparation method and equipment, the equipment comprises: a base, one side of the top of the base is provided with a preparation rack; the control mechanism is located in the preparation frame and comprises a positioning assembly, a material taking assembly and a bearing assembly, raw materials for preparing the nanocrystalline magnetic sheets are added into the feeding box through the feeding hopper, so that the raw materials are located in the feeding box, stirring rollers are driven by a servo motor to rotate, and the raw materials in the smelting box can be smelted; through the arrangement of the control mechanism, finished wafers can be taken out quickly, the production efficiency of the device is improved, the risk that the wafers are damaged due to frequent manual taking and placing of the wafers is avoided, meanwhile, the problem that the wafers are possibly affected by unnecessary heat or other environmental factors due to long-time retention in an existing device is solved, and the production efficiency of the device is improved. And the microstructure and the magnetic performance of the material are further damaged.

The present invention provides: a Nd-Fe-B multilayer sintered magnet which is magnetically uniform, while having high magnetic characteristics; and a method for producing the Nd-Fe-B sintered magnet without performing a cutting step. The method of the present invention comprises the steps of: producing a Nd-Fe-B thin plate-shaped sintered magnet in which the c-axis direction of an Nd2Fe14B tetragonal compound is oriented within the main surface of the Nd-Fe-B thin plate-shaped sintered magnet, and which has a high degree of orientation of 90% or more and a thickness of 3 mm or less, without performing a cutting step, by supplying and filling an alloy powder into a mold having a structure partitioned by a plurality of partition plates arranged at a predetermined interval, applying a magnetic field in a direction parallel to a main surface of a cavity partitioned by the partition plates to orient the alloy powder, and then performing sintering, and laminating a plurality of Nd-Fe-B thin plate-shaped sintered magnets obtained by the above step.

The invention belongs to the technical field of metal material processing, and discloses a cold rolling method for overcoming brittle fracture of non-oriented silicon steel for a new energy automobile, which comprises the following steps: S1, normalizing treatment: heating at 920-1000 DEG C for 2.5-4 minutes; s2, pickling treatment: pickling in an acidic aqueous solution, then soaking in a clean water tank, neutralizing with an alkaline aqueous solution, blow-drying and coating oil to prevent rusting; s3, heating treatment is conducted, specifically, the workpiece is placed in a box-type resistance furnace, and heat preservation is conducted for 20-120 min under the condition of 200-500 DEG C; s4, cold rolling is conducted, specifically, hot rolling is rapidly conducted on a cold-rolling mill; and S5, continuous annealing is conducted, specifically, continuous annealing is conducted at the strip steel speed of 85 m / min to 95 m / min, and the annealing soaking temperature is 920 DEG C to 1000 DEG C. The technical problem that when silicon steel cold rolling is carried out in a laboratory environment, the edge of a cold-rolled plate is cracked or brittle fracture occurs is solved.