23results about How to "Improve remanence" patented technology

A diffusion preparation method of a Fe-rich high-coercivity samarium-cobalt magnet belongs to the technical field of magnetic material preparation, solves the technical problems that the Fe-rich samarium-cobalt magnet is not easy to form a good cellular structure and the process flow is long, and comprises the following steps: S1, weighing a samarium-cobalt permanent magnet alloy raw material, and preparing an alloy ingot; s2, alloy particles are prepared through a mechanical crushing method, and the alloy particles are prepared into alloy powder; s3, the samarium-cobalt alloy powder is subjected to magnetic field orientation forming and cold isostatic pressing forming, and a green body is prepared; s4, performing sintering solution treatment on the green body to prepare a sintered samarium-cobalt permanent magnet blank, and processing the blank into a samarium-cobalt magnet sheet; s5, performing primary PrCu diffusion treatment on the samarium-cobalt magnet sheet; s6, the magnet sheet is subjected to secondary SnFe diffusion treatment; and S7, performing aging treatment on the secondary diffusion sheet to obtain the samarium-cobalt permanent magnet. The preparation method provided by the invention is easy to operate, control and industrialize, and the prepared Fe-rich sintered samarium-cobalt magnet is excellent in performance.

The invention discloses a large-size high-performance R-T-B rare earth permanent magnet and a preparation method thereof. The thickness of the magnet in the orientation direction is 4-14 mm; the residual magnetism Br of the large-size high-performance magnet is greater than or equal to 14.0 kGs, and the coercive force Hcj is greater than or equal to 23.0 kOe. When the magnet base body is prepared, a layered powder laying mode is adopted, so that the surface layer of the magnet is made of single alloy easy to diffuse, the core part of the magnet is made of double alloy, it is guaranteed that the core part of the magnet has high coercive force, meanwhile, the grain boundary diffusion capacity of the surface layer of the magnet is optimized, and the advantages of the double alloy and grain boundary diffusion are fully combined. Besides, an alloy of a low-melting-point metal element M2 and a heavy rare earth element RH in a certain proportion is adopted as an auxiliary alloy and a grain boundary diffusion source, the diffusion depth of the heavy rare earth element RH is promoted, excessive enrichment of the heavy rare earth element RH in a small area is prevented, and generation of body diffusion is inhibited. According to the method, the coercive force of the magnet is remarkably improved, meanwhile, it is guaranteed that the magnet has high residual magnetism, and the large-size high-performance R-T-B rare earth permanent magnet is prepared.

The invention discloses a cerium-rich R-T-B series sintered magnet and a preparation method thereof.The preparation method comprises the following steps that S1, mixed powder is prepared, the mixed powder is obtained by evenly mixing first R-T-B series alloy powder rich in cerium and poor in rare earth and second R-T-B series alloy powder poor in cerium and rich in rare earth, the sphericity degree of the first R-T-B series alloy powder is not lower than 0.75; and S2, preparing the mixed powder into the R-T-B series sintered magnet. According to the preparation method, a low-Ce-content grain shell layer is constructed in the cerium-rich R-T-B series sintered magnet, so that the intrinsic coercive force of the cerium-rich R-T-B series sintered magnet is improved. By means of the preparation method, the high-performance R-T-B series sintered magnet rich in the Ce element can be prepared, and application of Ce resources in the R-T-B series sintered magnet is promoted.

The invention relates to a method for controllably preparing a magnetic nanofiber film by current regulation and control magnetic field assisted electrospinning, which comprises the following steps: weighing PAN white powder, dissolving in a DMF organic solvent, continuously stirring by magnetic field force, and carrying out ultrasonic dispersion treatment on the solution by using an ultrasonic cleaner to prepare a uniformly dispersed PAN / DMF solution; adding Fe3O4 nanoparticles and a dispersing agent Triton X-100 with the same amount as the Fe3O4 nanoparticles into the prepared solution, and performing ultrasonic dispersion treatment to form a uniformly dispersed magnetic electrostatic spinning solution; according to the prepared magnetic electrostatic spinning solution, a thin and uniform high-performance magnetic nanofiber sample is prepared through a controllable magnetic field generated by a current control electromagnetic lens to assist an electrostatic spinning device, the thin and uniform high-performance magnetic nanofiber sample is placed in a drying box to be dried, and the thin and uniform high-performance magnetic nanofiber sample with the reduced deposition circle area, the increased thickness, the increased mechanical property, the improved magnetic property and the high-performance magnetic performance is obtained. The average diameter of the nanofibers is reduced and the nanofibers are uniform.

The present invention relates to a neodymium iron boron rare earth magnet and a preparation method thereof, and relates to the technical field of rare earth magnet preparation. By designing the coordinated diffusion of a diffusion source and a magnet, diffusion and aging treatment are performed to obtain a high-performance heavy rare earth-free magnet. The diffusion source is prepared by coating a layer of heavy rare earth-free alloy film on a diffusion source sheet, and performing aging treatment to form a new type of diffusion source, wherein the diffusion source sheet is R α RH δ M β B γ Fe 100‑α‑β‑γ‑δ The heavy rare earth-free film is a film with the chemical formula R n M m , aging treatment is carried out to form a new diffusion source; the chemical formula of NdFeB magnet is R a M 1b M 2c B d Fe 100‑a‑b‑c‑d After the magnet is diffused with Dy diffusion source, the remanent magnetism decreases by less than 0.15kGs, and the Hcj increases by more than 8kOe. After the magnet is diffused with Tb diffusion source, the remanent magnetism decreases by less than 0.15kGS, and the Hcj increases by more than 11kOe.

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.

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.

The invention discloses a preparation method of strontium ferrite and the strontium ferrite and belongs to the technical field of permanent magnet materials, and the preparation method of the strontium ferrite is characterized by comprising the following preparation steps: S1, raw material preparation: mixing 80-88 parts by weight of ferric oxide, 6.5-8.5 parts by weight of strontium carbonate and 0.5-0.9 part by weight of calcium carbonate powder to obtain a mixture A; s2, performing primary wet ball milling on the mixture A to obtain mixture A slurry; s3, drying the slurry of the mixture A obtained in the step S2, pre-sintering, and crushing to obtain pre-sintered powder; s4, mixing 0.8-1.5 parts by weight of cobaltosic oxide, 3-4 parts by weight of lanthanum oxide, 0.2-0.6 part by weight of silicon dioxide and 2-6 parts by weight of a dispersing agent with the pre-sintered material powder, and performing secondary wet ball milling to obtain slurry of a mixture B; and S5, drying the slurry of the mixture B, pressing into a blank, and sintering to obtain the strontium ferrite at the sintering temperature of 1175-1205 DEG C, and keeping the temperature for 4-6 hours, thereby achieving the effect of improving the magnetic performance of the strontium ferrite.

The invention discloses a preparation method of an amorphous iron core, and belongs to the technical field of amorphous iron cores. The invention discloses a preparation method of an amorphous iron core, which comprises the following preparation steps: (1) winding an iron-based amorphous alloy strip to obtain an amorphous iron core blank; (2) carrying out pre-annealing treatment on the amorphous iron core blank; (3) winding copper strips inside and outside the amorphous iron core blank subjected to pre-annealing treatment, and performing secondary annealing treatment; and (4) putting the amorphous iron core blank subjected to secondary annealing treatment into an insulating adhesive for vacuum impregnation, taking out the amorphous iron core blank, and putting the amorphous iron core blank into a drying oven for drying to obtain the amorphous iron core.

The invention discloses a neodymium-iron-boron magnet and a preparation method and application thereof. The neodymium-iron-boron magnet comprises an R1-O-F enrichment area, the R1-O-F enrichment area is located in the area from the position with the vertical distance being 100 micrometers from the surface of the neodymium-iron-boron magnet to the center of the neodymium-iron-boron magnet, and R1 is one or more of Pr, Nd, Gd and Ho; the volume fraction of the R1-O-F enrichment area is 1%-5%, and the meaning of the volume fraction is the percentage of the volume of the R1-O-F enrichment area in the total volume of the neodymium-iron-boron magnet. The neodymium-iron-boron magnet disclosed by the invention has excellent residual magnetism, coercive force, Hd5 and high-temperature squareness.

The invention discloses a magnetic control mechanism magnetic shell material and a preparation method thereof, and belongs to the technical field of power distribution equipment, and the magnetic control mechanism magnetic shell material comprises the following chemical component element proportions (%): 0.5-0.55% of C; 6.0 to 8.0% of chromium (Cr); 0.20 to 0.25% of nickel (Ni); 0.60 to 0.80% of Si (silicon); less than or equal to 0.035 of phosphorus P; mn: less than or equal to 0.1; and the balance of Fe. The preparation method comprises the following steps: weighing raw materials and preparing; mixing the raw materials, and forging a blank to obtain a steel ingot; machining the steel ingot, and machining the steel ingot into the shape required by the magnetic shell according to the design size, so as to obtain a preliminarily formed magnetic shell; and performing heat treatment on the preliminarily formed magnetic shell to obtain the magnetic shell of the magnetic control mechanism. According to the magnetic shell, the saturation flux density, the residual magnetism and the alloy coercive force of a machine body are improved, the strength, the hardness and the corrosion resistance are improved, the magnetic shell material is a low-alloy carbon steel system, the alloy cost is low, and the magnetic shell can be widely popularized in the technical field of power distribution switch equipment.

The present invention relates to a hot-deformed NdFeB magnet and a preparation method thereof. The preparation method of the hot-deformed NdFeB magnet comprises the following steps: providing an iron-nickel alloy powder, wherein the mass fraction of the nickel element in the iron-nickel alloy powder is greater than or equal to 15%; and providing NdFeB quick-quenching powder, mixing the NdFeB quick-quenching powder with the iron-nickel alloy powder to obtain a mixed powder, and hot pressing and hot-deforming the mixed powder under vacuum conditions to obtain a hot-deformed NdFeB magnet, wherein the mass fraction of the iron-nickel alloy powder in the mixed powder is less than or equal to 3%. The preparation method of the hot-deformed NdFeB magnet can effectively improve the remanence and magnetic energy product of the hot-deformed NdFeB magnet, thereby optimizing the magnetic properties of the hot-deformed NdFeB magnet, and the process is simple, and can be widely used in the actual production of hot-deformed NdFeB magnets.

The invention discloses a rare earth magnet and a preparation method thereof, belonging to the technical field of rare earth magnets. The rare earth magnet is obtained by coating a diffusion source on a neodymium iron boron base material, performing diffusion and aging treatment, wherein the diffusion source alloy component is R α M β B γ Fe 100‑α‑β‑γ , where R refers to at least one of Nd and Pr, M refers to at least one of Al, Cu and Ga, and NdFeB magnet is R a M b B c Fe 100‑a‑b‑c , wherein R refers to at least one of Nd, Pr, Ce, and La, M refers to at least one of Al, Cu, Ga, Ti, Zr, Co, Mg, Zn, Nb, Mo, and Sn, and the remaining component is Fe. A rare earth magnet and a preparation method thereof of the present invention has a remanence reduction range of less than 0.3 kGs and an Hcj increase range of more than 4 kOe.

The invention relates to the technical field of manufacturing of magnetic materials and flexible electronic devices, in particular to a flexible magnetic sheet, a preparation method of the flexible magnetic sheet, a magnetic attraction assembly and wearable equipment. The preparation method of the flexible magnetic sheet comprises the following steps: mixing anisotropic magnetic powder treated by a coupling agent with liquid silicone rubber and a catalyst to form slurry, then carrying out hot press molding by a press with a pressing orientation device to enable the magnetic powder to be directionally arranged, and finally, carrying out post-treatment to obtain the flexible magnetic sheet. According to the method, the magnetic sheet with high residual magnetism, high attraction, extremely low modulus and high flexibility is successfully prepared through cooperation of magnetic powder type selection and orientation processes and optimization of the content of key components, and the problem that magnetic performance and elasticity of a traditional magnetic sheet are difficult to consider at the same time is solved.

The utility model relates to an embedded rotor, comprising a first permanent magnet which is configured to be a cylinder, is integrally formed, is provided with a plurality of interval grooves along the circumferential direction, and is divided into a plurality of first permanent magnet sub-parts by the interval grooves; a second permanent magnet disposed in the spacing groove; a magnet ring surrounding the first permanent magnet; wherein the first permanent magnet sub-parts have a magnetic field direction extending in the radial direction, and the first permanent magnet sub-parts on both sides of the spacing grooves have opposite magnetic field directions, and wherein the magnetic field direction of the second permanent magnets extends in the circumferential direction, and wherein the magnet ring comprises a plurality of magnet ring sections, the magnetic ring sections respectively have the same magnetic field direction as the corresponding first permanent magnet sub-parts, and the magnetic fields of the second permanent magnets in the interval grooves and the magnetic fields of the first permanent magnets on the two sides of the interval grooves form a continuous magnetic circuit with the shortest path. In addition, the utility model also relates to an electric machine comprising the embedded rotor.

The present invention provides a rare earth-poor two-phase composite magnetic material and a preparation method thereof, belonging to the field of magnetic materials. The structural formula of the rare earth-poor two-phase composite magnetic material is: (RE a Nd 1‑a ) b (Fe 1‑c Co c ) 100‑b‑e‑f‑g‑h (B 1‑d Q d ) e Cu f T g M h ; Among them, RE is a light rare earth element, Q is a main group element, T is a low melting point element, and M is a grain refining element; a , c , d Respectively represent the molar fractions of RE, Co, and Q replacing Nd, Fe, and B elements, satisfying 0≤ a ≤0.2,0≤ c ≤0.05,0≤ d ≤1; b、e、f、g、h Respectively represent the molar fractions of the total content of Nd and light rare earth elements, the total content of B and main group elements, Cu elements, low melting point elements, and grain refining elements, satisfying 4≤ b ≤7, 6≤ e ≤10,0≤ f ≤1,0≤ g ≤1,0≤ h ≤2.

The invention relates to the field of preparation of hot-pressed magnets, in particular to a high-magnetic-energy-product hot-pressed magnet and a preparation method thereof.The hot-pressed magnet is mainly prepared with neodymium iron boron magnetic powder and flaky metal soft magnetic powder as magnetic powder raw materials, and the flaky metal soft magnetic powder is at least one of carbonyl iron powder, iron-nickel powder and iron-cobalt powder; by specifically adjusting the adding weight of the flaky metal soft magnetic powder and the microscopic physical performance of the flaky metal soft magnetic powder, the residual magnetism and the maximum magnetic energy product of the prepared hot-pressed magnet can be greatly improved, the coercive force is still maintained at a relatively high level, and an unexpected technical effect is achieved; the preparation process is simple to operate, convenient to control, low in cost and convenient for industrial popularization.

The invention discloses neodymium iron boron magnetic powder, a rare earth permanent magnet, a method and application. The invention discloses a method for improving fluidity of neodymium iron boron magnetic powder. The method comprises the following steps: 1) providing alloy coarse powder obtained by hydrogen decrepitation of an alloy melt-spinning sheet; (2) a solid modifier and the alloy coarse powder obtained in the step (1) are mixed and subjected to jet milling, and neodymium iron boron magnetic powder is obtained; wherein the mass of the solid modifier is 0.2-0.8 wt% of the mass of the alloy coarse powder; the solid modifier is composed of an amide substance and pentaerythritol stearate, and the mass of the amide substance accounts for 68-95 wt% of the mass of the solid modifier; the amide substance is selected from octadecanamide and / or oleamide; the repose angle of the obtained neodymium iron boron magnetic powder is smaller than or equal to 44.5 degrees. According to the method, the residual magnetism of the obtained rare earth permanent magnet can be further improved, and the coercive force of the rare earth permanent magnet is basically not reduced.

The invention provides a nano magnetic particle and a preparation method and application thereof.The chemical formula of the nano magnetic particle is Sr1-x-yBaxLayFe12-zCozO19, 0 < = x < = 0.3, 0 < = y < = 0.3, 0 < = z < = 0.25, x, y and z are not 0 at the same time, and the average particle size of the nano magnetic particle is 20-40nm. The nano magnetic particle is small in particle size and shows excellent magnetic performance; and the magnetic storage device can further meet the storage requirement of huge data in the informatization era.

The invention provides a high-performance magnetic code disc AlNiCo composite film material and a preparation method thereof, and relates to the technical field of magnetic materials, the high-performance magnetic code disc AlNiCo composite film material comprises a substrate layer and a non-magnetic / ferromagnetic composite multilayer film deposited on the substrate layer; wherein the thin film at least comprises a plurality of layers of AlNiCo films, an intercalation metal film and a protective layer metal film. According to the invention, the AlNiCo film respectively meets the performance requirements of a high-magnetism film and a non-magnetic buffer layer, the preparation method of the film material is simple, the performance is high, the cost is low, and a scientific basis and an innovative idea are provided for the preparation and application of the film type magnetic code disc material.

The invention relates to a data set construction method and device applied to a rare earth iron boron performance prediction model. The method comprises the following steps: determining a first intrinsic characteristic of the rare earth iron-boron component according to the number and initial proportion of basic trace elements in the rare earth iron-boron component, predicting by using an initial data set containing the initial proportion and the first intrinsic characteristic to obtain a first predicted value of the rare earth iron-boron performance, and when the first predicted value does not meet a preset performance standard interval, determining the performance of the rare earth iron-boron component according to the first predicted value. Adjusting the number of the basic trace elements and the corresponding initial proportion to obtain the number of updated trace elements and the updating proportion; and based on the number of the updated trace elements and the updating proportion, determining a second intrinsic feature so as to construct an updated data set, and predicting by utilizing the updated data set to obtain that a second predicted value of the rare earth iron boron performance meets a preset performance standard interval. According to the method, the data analysis cost and time for constructing the data set of the rare earth iron boron performance prediction model are saved, and the performance prediction precision of the rare earth iron boron performance prediction model is improved.

The application relates to the field of magnet materials, and particularly discloses a neodymium-iron-boron material and a preparation method and application thereof. The preparation method of the neodymium-iron-boron material comprises the following steps: S1, respectively melting and pouring main phase material and auxiliary phase material to obtain main phase rapid solidification tablets and auxiliary phase rapid solidification tablets; S2, respectively performing hydrogen breaking treatment on the main phase rapid solidification tablets and the auxiliary phase rapid solidification tablets to obtain main phase coarse powder and auxiliary phase coarse powder, and respectively performing airflow grinding to obtain main phase fine powder and auxiliary phase fine powder; S3, performing pressing on a mixture containing the main phase fine powder and the auxiliary phase fine powder to obtain a blank, and performing sintering to obtain a neodymium-iron-boron material matrix; and S4, performing diffusion treatment on the neodymium-iron-boron material matrix by using a diffusion source; the obtained neodymium-iron-boron material has excellent remanence and coercive force, and good stability of magnetic performance.

The invention discloses a high-strength magnetic shoe and a production process thereof, and belongs to the technical field of magnetic shoe production, and the magnetic shoe comprises the following raw materials: 80-90 parts of ferric oxide, 12-15 parts of strontium carbonate, 0.4-0.6 part of calcium carbonate, 0.1-0.2 part of zirconium oxide, 0.5-0.7 part of boric acid, 0.5-0.7 part of cobalt oxide, 2-6 parts of yttrium oxide, 0.3-0.5 part of silicon dioxide and 0.2-0.4 part of bismuth trioxide. And the high-strength magnetic shoe is prepared through secondary sintering and wet pressing molding processes. By utilizing the synergistic effect of zirconium oxide and yttrium oxide, while the magnetic performance of the magnetic shoe is improved, the phase change toughening effect of zirconium oxide is maximized, and the mechanical strength of the magnetic shoe is enhanced. The raw material ratio is adjusted, the preparation method is simple, and the high-strength magnetic shoe can be prepared.