221results about How to "Improve magnetism" patented technology

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 discloses a method for preparing anisotropic samarium-iron-nitrogen magnetic powder, and belongs to the technical field of magnetic materials, the method comprises the following steps: preparing Sm and Fe according to design components, and smelting to obtain samarium-iron alloy molten steel; casting the samarium-iron alloy molten steel onto a cooling roller to obtain an iron-samarium alloy sheet; the iron-samarium alloy sheet is placed in a vacuum heat treatment furnace to be subjected to homogenization treatment, the alloy sheet obtained after homogenization treatment is cooled to 200-300 DEG C, in the vacuum environment, hydrogen is introduced into the furnace, the absolute pressure of the hydrogen is controlled to be 0.05-0.1 MPa, and hydrogenation treatment is conducted for 2 h; after hydrogenation is completed, the temperature is increased to 400 DEG C, nitrogen is introduced to 0.5 MPa, the temperature is increased to 530 DEG C, then the furnace temperature is reduced to the room temperature, and the anisotropic samarium-iron-nitrogen magnetic powder is obtained.The preparation method of the samarium-iron-nitrogen magnetic powder has the advantages of being simple in preparation process, low in energy consumption, high in production efficiency, small in magnetic powder particle size, high in magnetic performance and good in magnetocrystalline anisotropy.

The invention discloses a corrosion-resistant neodymium-iron-boron magnet and a preparation method, and belongs to the technical field of neodymium-iron-boron magnets, and the preparation method of the corrosion-resistant neodymium-iron-boron magnet is characterized by comprising the following steps: S1, uniformly mixing neodymium-iron-boron powder obtained by jet milling with alloy nano-powder, and sieving to obtain a mixed material, wherein the adding amount of the alloy nanometer powder is 0.2-0.8% of the weight of the neodymium iron boron powder; s2, compression molding: carrying out compression molding and oil isostatic pressing on the mixed material to obtain a pressed blank; s3, sintering molding: sintering the pressed blank to obtain a neodymium-iron-boron magnet; s4, carrying out pretreatment on the neodymium-iron-boron magnet; and S5, preparing a coating solution, stirring and mixing silane, a solvent and water according to the weight ratio of 1: (0.8-1.2): (2.2-2.8) to prepare a silane hydrolysate, then adding zinc and aluminum sheet-shaped powder, uniformly stirring and mixing, spraying, and drying to obtain the corrosion-resistant neodymium-iron-boron magnet, thereby achieving the effect of improving the corrosion resistance of the neodymium-iron-boron magnet.

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 method for improving the binding force of a neodymium-iron-boron magnet coating and application. The method comprises the steps that rare earth hydroxide suspension liquid is prepared; spraying double surfaces of the neodymium-iron-boron magnet; and carrying out grain boundary thermal diffusion treatment. According to the method, the rare earth hydroxide is pyrolyzed into the rare earth oxide to be deposited on the surface of the sintered neodymium-iron-boron magnet, the diffusion depth of heavy rare earth elements in the magnet can be effectively increased, and the components and thickness of the coating are accurately controlled; the cost of preparing the rare earth oxide from the rare earth hydroxide is saved, the preparation process of the diffusion source is simplified, and the spraying efficiency is high; the obtained coating is high in quality and low in porosity, and the bonding strength of a diffusion source and a magnet interface is high; subsequent grain boundary diffusion can be promoted, and a new thought is provided for industrial application of the grain boundary diffusion technology.

The invention discloses auxiliary alloy nano powder, modified magnetic powder, a sintered neodymium-iron-boron magnet and a preparation method. According to the preparation method of the auxiliary alloy nanopowder for modifying the magnetic powder, the chemical component of the auxiliary alloy nanopowder is Re100-m-n (Cu, X) mQn, Re is a light rare earth element, X is selected from at least one of Al, Ga, Co, Mg, Sn, Te and Sb, and Q is selected from at least one of Ti, Zr, Hf, V, Nb, Ta, W and Mo; m and n are atomic numbers respectively, m is greater than or equal to 24 and less than or equal to 72.4, n is greater than or equal to 12.5 and less than or equal to 76, and 100-m-n is greater than or equal to 0; the auxiliary alloy nano powder does not contain Fe and B; the preparation method comprises the following steps: (1) providing an auxiliary alloy sheet; and (2) mixing the auxiliary alloy sheet, a modified substance and an organic solvent, and carrying out primary crushing and fine crushing to obtain the auxiliary alloy nano powder. The coercive force and the squareness of the sintered neodymium-iron-boron magnet can be improved, and the absolute value of the residual magnetism temperature coefficient and the absolute value of the coercive force temperature coefficient of the sintered neodymium-iron-boron magnet are reduced.

The invention belongs to the technical field of soft magnetic materials, and particularly relates to an integrally injection-molded nanocrystalline strip winding iron core and a preparation method thereof. The preparation method comprises the following steps: performing annealing crystallization and destressing treatment on an amorphous nanocrystalline strip, winding the amorphous nanocrystalline strip into a closed magnetic circuit, then immersing the closed magnetic circuit into an adhesive resin glue solution, taking out the closed magnetic circuit, and heating, curing and forming the closed magnetic circuit to obtain a magnetic core; the obtained magnetic core is placed in a hard shell, then a copper bar is inserted, finally, a plastic part between the magnetic core and the copper bar is completed through injection molding, and the nanocrystalline strip winding iron core integrally formed through injection molding is obtained. According to the method, integrated injection molding of the magnetic core, the copper bar and the plastic part can be achieved. By further optimizing an adhesive resin glue solution system formed by curing, the curing effect and the magnetic performance of the iron core can be remarkably improved.

The invention provides an intrinsic magnetic MXene material and a preparation method and application thereof, the preparation method comprises the following steps: S1, mixing an aqueous solution of MXene with an alkaline reagent, and carrying out ultrasonic dispersion to obtain a mixed dispersion liquid; freezing the mixed dispersion liquid into a solid by liquid nitrogen; the alkaline reagent is potassium hydroxide or sodium hydroxide; s2, the obtained solid is subjected to freeze drying, and the Archimedes screw type MXene aerogel is obtained; s3, the Archimedes spiral type MXene aerogel is subjected to heat treatment under the protection of inert gas, and the intrinsic magnetic MXene material is obtained. The invention designs and develops a single-component pure MXene electromagnetic wave absorbing material on the premise of not introducing magnetic nanoparticles.

The invention discloses non-oriented silicon steel for a motor iron core of an air conditioner compressor and a preparation method of the non-oriented silicon steel. The preparation method comprises the following steps: smelting: molten steel comprises the following chemical components in percentage by weight: 0.75-1.35% of Si, 0.23-0.28% of Al, 0.18-0.45% of Mn, 0.0015-0.0035% of rare earth La, less than or equal to 0.0025% of C, less than or equal to 0.003% of S and the balance of Fe and impurities; continuous casting: controlling the isometric crystal proportion of a continuous casting blank to be greater than or equal to 55%; during hot rolling and heating, the soaking temperature ranges from 1130 DEG C to 1140 DEG C, the heating time ranges from 150 min to 200 min, the outlet temperature of rough rolling is controlled to range from 930 DEG C to 940 DEG C, the final rolling temperature ranges from 835 DEG C to 875 DEG C, and the coiling temperature ranges from 650 DEG C to 680 DEG C; cold continuous rolling; annealing is conducted, the annealing temperature ranges from 880 DEG C to 930 DEG C, and the plate passing speed ranges from 150 m / min to 165 m / min; and cooling, coating and finishing.

The invention discloses a self-constrained diffusion bonding nickel-tungsten alloy composite base band billet and a preparation method thereof, and belongs to the technical field of preparation of metal base band billets for high-temperature coating superconductors. According to the method, a high-tungsten alloy bar with an interference size is pressed into a hollow low-tungsten alloy pipe, and the tubular structure restrains displacement, so that contact interfaces extrude each other to generate plastic deformation. And the deformation amount of the alloy interface is larger than the critical deformation amount, recrystallization occurs at the high temperature to accelerate diffusion of atoms, metallurgical bonding is achieved, and the nickel-tungsten alloy composite base band billet of the three-layer sandwich structure is obtained. Plastic deformation generated between layers through self-constraint drives recrystallization and promotes element diffusion to form metallurgical bonding in the thermal activation process, and the probability of the cracking phenomenon of the cold-rolled nickel-tungsten alloy composite base band can be remarkably reduced; the preparation method is a preparation mode for realizing the ultra-long metal base band billet with a sharp cubic texture surface, high strength and low magnetism; and the surface texture content, the magnetism and the strength of the composite base band can be flexibly regulated and controlled by matching nickel-tungsten alloy bars with different components, shapes and sizes.

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 relates to a magnetic composite material and a preparation method and application thereof, the preparation method comprises the following steps: mixing nanocrystalline, FeNi alloy powder and a binder, and then baking to obtain the magnetic composite material, the average particle size of the nanocrystal is 10 [mu] m-50 [mu] m; the average particle size of the FeNi alloy powder ranges from 0.1 micrometer to 10 micrometers. The FeSiNbBCu nanocrystals and the FeNi alloy powder with different particle sizes are selected, and the particle sizes of the FeSiNbBCu nanocrystals and the FeNi alloy powder are reasonably matched, so that particle pores of the FeSiNbBCu nanocrystals can be fully filled with the FeNi alloy powder with small particle sizes, the porosity of the magnetic composite material can be reduced, the density of the magnetic composite material can be improved, and the magnetic performance of the magnetic composite material can also be improved. The method provided by the invention is simple in process and convenient for large-scale production, and the prepared magnetic composite material is high in magnetic conductivity and low in high-frequency loss.

The invention relates to an oriented silicon steel Goss texture regulation and control method. The method comprises the steps of steelmaking, continuous casting, hot rolling, normalizing, cold rolling, primary recrystallization annealing and secondary recrystallization annealing. Wherein the reduction rate of each pass of cold rolling is 30%-40%; the temperature of the primary recrystallization annealing plate is controlled to be 800-830 DEG C, and the time is 3-6 minutes; and the temperature of the secondary recrystallization annealing plate is controlled to be 900-1150 DEG C, and the time is 0.25-4 hours. Compared with the prior art, the method has the beneficial effects that the proportion of Goss seeds in a primary recrystallization structure after primary recrystallization annealing and the orientation environment of crystal grains around the Goss seeds are regulated and controlled by controlling the cold rolling process and the primary recrystallization annealing process, so that the Goss crystal grains rapidly grow in the secondary recrystallization process of secondary recrystallization annealing, and the yield of the Goss crystal grains is improved. The magnetic induction intensity B800 of the oriented silicon steel with the thickness specification of 0.20 mm can reach 1.85-1.95 T, and the magnetic induction intensity B800 of the oriented silicon steel with the thickness specification of 0.18 mm can reach 1.92-1.98 T.

The invention discloses an induction power generation and frequency modulation vibration reduction integrated ballastless track vibration reduction structure, and belongs to the technical field of track traffic. A track plate and a base plate are longitudinally laid along a track line, and the track plate is located above the base plate; the adjusting layer is arranged between the track plate and the base plate; an elastic vibration reduction layer is arranged between the base plate and the piezoelectric device layer, and the elastic vibration reduction layer is filled in a limiting structure in the base plate; a silicon steel sheet iron core structure of an electromagnetic coil is arranged in the elastic vibration reduction layer in the limiting structure; the piezoelectric device layer is located between the adjusting layer and the base plate and connected with the electromagnetic coil through a wire. The piezoelectric material and the magneto-rheological elastomer material are adopted, integration of induction power generation and frequency modulation vibration reduction is achieved, when the pressure is not enough to enable the piezoelectric device to output current, the magneto-rheological elastomer material still has the mechanical property of a common rubber elastomer, the whole structure still can guarantee the vibration reduction function, and meanwhile power-off protection is achieved.

The invention discloses a manufacturing method of ultra-thin oriented silicon steel with a high lamination coefficient, and belongs to the technical field of ultra-thin oriented silicon steel. By controlling the cold rolling procedure and the annealing procedure, the reduction rate and the tensile stress of a rolling roller in the cold rolling process, the tension in the annealing process, the temperature and the tension after annealing and other factors are specifically controlled, the strip breakage rate is reduced, the strip shape of the steel strip is controlled, and meanwhile the magnetism of the steel strip is improved; a steel strip straightening procedure after annealing is added, the steel strip temperature, the applied tension and the steel strip speed in the straightening process are controlled, the strip shape of the steel strip is further adjusted, the magnetism of the steel strip is improved, and the stacking coefficient of the ultrathin oriented silicon steel strip is increased. Wherein the stacking coefficient can reach 96% or above, the magnetic performance B8 reaches 1.70 T or above, the iron loss P1.5 / 400 reaches 9 w / kg or below, and the ultrathin oriented silicon steel strip which is good and stable in plate shape, good in magnetic performance and good in iron loss performance and ranges from 0.03 mm to 0.08 mm is obtained.

The invention relates to a resistive random access memory structure and a preparation method thereof. The memory structure comprises a semiconductor substrate, and a lower insertion layer thin film, a dielectric layer thin film and a top electrode are sequentially formed on the semiconductor substrate; the semiconductor substrate adopts a substrate Pt / Ti / SiO2 / Si or FTO as a bottom electrode; the lower intercalation layer thin film is made of ZnO, TiO, SiOx or AlOx; the dielectric layer film is made of a ZnO semiconductor material, at least one of magnetic transition metal elements Mn, Ti, Cr and Ni is introduced, and the doping amount of the transition metal is 1%-7% at. The lower intercalation layer and the dielectric layer film are prepared on the surface of the semiconductor substrate through a pulse laser deposition method. The method comprises the following steps: preparing a Mn-doped ZnO target material by adopting a sol-gel method; preparing a lower intercalation film and a dielectric layer film by adopting pulse laser deposition; a metal mask plate is used for assisting in preparing the top electrode. According to the invention, the working stability and reliability of the resistive random access memory are improved.

The invention discloses an impregnation liquid for an iron-based alloy magnetic powder core and an impregnation method based on the impregnation liquid. The impregnation liquid is prepared from the following components in percentage by mass: 5-15% of a metal organic compound, 5-20% of resin and 65-90% of an organic solvent. The impregnation method comprises the following steps that (1) iron-based alloy powder before insulation is put into impregnation liquid to be soaked, drying is conducted after soaking, and impregnated iron-based alloy powder is obtained; (2) carrying out insulation treatment on the iron-based alloy powder by using the nano silicon oxide dispersion liquid, and preparing an iron-based alloy magnetic powder core by using a powder metallurgy process after the insulation treatment, so as to obtain the iron-based alloy magnetic powder core; the obtained iron-based alloy magnetic powder core is cleaned and dried, and a to-be-impregnated iron-based alloy magnetic powder core is obtained; (3) completely immersing the iron-based alloy magnetic powder core into the impregnation liquid for soaking, and cleaning after soaking; and (4) heating and curing the cleaned iron-based alloy magnetic powder core, and naturally cooling to obtain the impregnated iron-based alloy magnetic powder core.

The invention discloses a method for preparing neodymium iron boron magnetic powder by a chemical method, which comprises the following steps of: 1, mixing iron salt, an organic ligand and a solvent for coordination reaction to obtain an iron-based metal organic framework material; 2, dipping the iron-based metal organic framework material in the rare earth-fused salt mixed solution, and drying to obtain a dipping precursor; step 3, carrying out calcination and reduction reaction on the impregnated precursor to obtain a rare earth-iron precursor; and 4, mixing the rare earth-iron precursor with a reducing agent, and carrying out a reduction diffusion reaction. According to the method, an iron-based metal organic framework material is used as an iron source and a template, a dipping process is combined, a highly uniform and dispersed dipping precursor is obtained, the refined spherical neodymium iron boron magnetic powder is obtained through calcination, hydrogen reduction and a reduction diffusion reaction, and the magnetic powder is controllable in component and high in magnetic conductivity. The method is suitable for preparing the neodymium-iron-boron magnet with excellent magnetic performance and adjusting the composition and grain boundary distribution of the neodymium-iron-boron magnet.

The invention provides a rubber magnetic coded disc, a preparation method thereof and a high-precision magnetic encoder. The preparation method comprises the following steps: banburying and mixing rubber and magnetic powder to obtain rubber magnetic particles; the rubber magnetic particles are subjected to smashing and first rolling, then sheet layer stacking and magnetizing are conducted, and a magnetized rubber magnetic sheet is obtained; and carrying out magnetic direction rearrangement on the magnetized rubber magnetic sheet, then carrying out second rolling and cutting to reduce the width of a magnetic pole, and then assembling the cut sheet to obtain the rubber magnetic code disc. According to the method, a precise magnetizing process is not needed, rubber and magnetic powder are adopted as raw materials, calendaring, overlapping and magnetizing are firstly carried out, and then calendaring, cutting and assembling are carried out to obtain the rubber magnetic code disc. The rubber magnetic coded disc is high in magnetic performance, can stably realize precise magnetization with the unipolar magnetic field width of 0.1-0.5 mm, and has wide application prospects in the fields of robots, automatic driving, industrial machine tools, semiconductor processing equipment, medical instruments, military industry and the like.

The present invention proposes an in-situ TiC / TiB2 binary ceramic hard phase grain boundary modified cerium-rich NdFeB material and a preparation method thereof, belonging to the technical field of permanent magnet materials; by utilizing the characteristics that TiC and TiB2 compounds can be in-situ generated and synergistically modified at the sintering temperature of NdFeB, a corrosion-resistant cerium-rich NdFeB material and a preparation method thereof are proposed, in which the TiC / TiB2 nano-hard phase synergistically grain boundary modified by in-situ precipitation of the two is beneficial to material densification; the prepared cerium-rich NdFeB material has higher corrosion resistance and magnetism than the cerium-rich NdFeB material modified by externally added micron TiC / TiB2; at the same time, compared with the commonly used preparation method of the cerium-rich NdFeB material with externally reinforced phase, the high-temperature synthesis link of the hard phase is omitted, energy is saved, and production costs are reduced.

The invention discloses a self-adaptive control system and method for neodymium-iron-boron sheet production, and relates to the technical field of material preparation and processing.The self-adaptive control system comprises a smelting analysis module, a rotating speed analysis module, an iron-boron alloy powder particle analysis module, a sintering temperature and duration analysis module, a neodymium-iron-boron sheet quality analysis module and a database; according to the method, various historical customer orders are combined, the appropriate smelting temperature and duration of the customer orders and the viscosity of neodymium iron boron alloy liquid based on the customer orders are obtained through analysis, the rotating speed of a melt-spinning machine is analyzed, parameters such as pressing pressure, sintering temperature and duration are determined according to the granularity of neodymium iron boron alloy powder, and finally the quality of the neodymium iron boron sheet is analyzed. And due to high intelligence and automation, the production efficiency is greatly improved, and the quality and consistency of products are ensured.

The invention discloses a double-alloy sintered neodymium-iron-boron permanent magnet and a preparation method and application thereof, and relates to the technical field of rare earth permanent magnet materials. Comprising the following steps that a main alloy and an auxiliary alloy are evenly mixed and then subjected to orientation profiling, cold isostatic pressing, liquid phase sintering and tempering heat treatment in sequence, the double-alloy neodymium iron boron permanent magnet is prepared, the chemical composition of the auxiliary alloy is AlxRE2yM100-x-y, RE2 is selected from one or more combinations of Ce, Dy, Gd, Ho, La, Nd, Pr, Tb and Y, and M is selected from any one or more combinations of Co, Cu, Ga, Ti, Zr and Nb; x and y satisfy 5 < = x < = 50 and 20 < = y < = 80; according to the method, on the premise that the magnetic performance of the neodymium iron boron permanent magnet is synchronously optimized, the mechanical performance of the neodymium iron boron permanent magnet is further improved, the mechanical performance and the magnetic performance of the sintered magnet have good consistency and stability, the technological method is simple and easy to implement, and the method is suitable for industrial production.

The invention relates to the technical field of biochar material preparation, in particular to a preparation method, a product and application of an yttrium iron oxide loaded biochar composite material. The biochar is prepared from the oxytetracycline mushroom dregs, the yttrium iron oxide is loaded on the basis of the biochar, the composite material is prepared through high-temperature calcination in the inert atmosphere, the composite material has obvious magnetic performance, the problem that materials are difficult to recycle is solved, and the cyclic utilization performance of the composite material is promoted. The CTC adsorption experiment result shows that the yttrium iron oxide loaded biochar composite material can effectively adsorb CTC and is an ideal material for efficient adsorbents.

The invention provides a manganese-zinc power ferrite composite material and a preparation method thereof. The manganese-zinc power ferrite composite material is prepared from the following components in percentage by weight: 75%-90% of a manganese-zinc power ferrite material and 10%-25% of a binder composition, the binder composition is prepared from the following components in percentage by weight: 10%-15% of polyformaldehyde resin, 2%-5% of high-density polyethylene, 0.5%-1.5% of a polyethylene octylene co-elastomer, 0.2%-0.5% of ethylene bis-stearamide, 1%-3% of zinc stearate and 1%-3% of dioctyl phthalate. The injection molding performance of the manganese-zinc power ferrite composite material is improved by regulating and controlling the composition of the binder and improving the process conditions, so that the manganese-zinc power ferrite composite material has high magnetic induction intensity (Bs), low power loss (Pc) and good mechanical strength.

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 invention discloses a method for removing calcium and calcium oxide in a rare earth permanent magnetic material, and relates to a method for removing calcium and calcium oxide. The invention aims to solve the problems that calcium and calcium oxide residues are difficult to remove in the process of preparing the rare earth permanent magnetic material by the existing reduction diffusion method and mechanical chemical synthesis method, and the magnetic performance of the magnetic material is reduced by the conventional removal mode. The method comprises the following steps: 1, mixing the rare earth permanent magnetic material with water for reaction; 2, adding dry ice into a mixed solution containing calcium hydroxide and the rare earth permanent magnetic material, and mixing; and 3, standing and precipitating, and separating calcium carbonate from the rare earth permanent magnetic material under the action of a magnetic field. The method is used for removing calcium and calcium oxide in the rare earth permanent magnetic material.

The present invention discloses a fly ash-based magnetic composite material and its preparation method and application, which belongs to the technical field of industrial wastewater purification and treatment. The preparation method comprises the following steps: adding acid-washed bleaching beads to a Fe-containing 3+ and Fe 2+ The solution is added, the pH is adjusted to 10, the reaction is stirred at 80°C, and filtered to obtain magnetic floating beads; the magnetic floating beads are dispersed in a MXene dispersion, the pH is adjusted to 5, ultrasonicated, stirred under an inert atmosphere, filtered, and dried to obtain a fly ash-based magnetic composite material. The preparation method provided involves a simple process, is non-toxic, and environmentally friendly, and is suitable for promotion and application. The fly ash-based magnetic composite material prepared by the present invention has a high adsorption and removal effect on Hg(II), and at the same time, due to the introduction of magnetism, it is easy to recycle, and the raw materials used are floating beads sorted from fly ash, which turns waste into treasure and reduces costs.

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.

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.