133 results about "Ferrite powder" patented technology

The invention discloses a super-wear-resistant super-hydrophobic coating in the technical field of coatings, the super-wear-resistant super-hydrophobic coating comprises a primer and a finishing coat, the primer comprises solvent-free aliphatic polyether polyol resin, micro-powder particles, di-tetratoluene diisocynate, fumed silica nanoparticles and a primer magnetic attraction material; the finishing paint comprises hydrophobic nanoparticles, a diluent, a finishing paint magnetic attraction material and a hydrophobic treatment agent, the primer magnetic attraction material is ferrite powder, and the finishing paint magnetic attraction material is nickel powder. The preparation method comprises the following steps: 1, preparing the primer; secondly, primer is sprayed; step 3, roughening the primer; 4, finish paint is manufactured; step 5, spraying finish paint; and step 6, detecting the performance of the coating. The preparation method is scientific and reasonable, the uniformity and stability of the coating in the preparation and coating process are ensured by optimizing the composition of the coating material, improving the preparation process and introducing a magnetic suction device, and therefore the wear resistance, hydrophobicity and adhesive force of the coating are improved.

The magnetic tape includes a non-magnetic support, and a magnetic layer containing a ferromagnetic powder. The ferromagnetic powder is a hexagonal ferrite powder, tilt cos θ of the hexagonal ferrite powder with respect to a surface of the magnetic layer, which is acquired by cross-sectional observation performed using a scanning transmission electron microscope, is 0.85 or more and 1.00 or less, and standard deviation σ of the cos θ in a width direction of the surface of the magnetic layer is 0.03 or less.

The invention belongs to the field of ferrite materials, and particularly relates to a high-coercivity strontium ferrite with iron partially replaced by aluminum and a preparation method of the high-coercivity strontium ferrite. Aiming at the problem of low coercive force of a ferrite pre-sintering material in the prior art, iron is partially replaced by aluminum, ferric nitrate, strontium nitrate, aluminum nitrate and glucose are used as reaction raw materials, the ratio of the total molar weight of Fe and Al to the molar weight of Sr is (9.5-12): 1, the ratio of the molar weight of Al to the total molar weight of Fe and Al is (0-0.41): 1, and the molar weight of glucose is 0.5-3.5 times of the total molar weight of Fe, Al and Sr; and calcining at 900-1200 DEG C for 1-3 hours by adopting a solution self-combustion-aluminum ion substitution method to prepare the strontium permanent magnetic ferrite powder material with high coercivity.

A ferrite powder comprising, as a main component compound, a magnetoplumbite-type hexagonal ferrite having a composition represented by the formula Sr(FexAlyZrz)12O19+δ (where x, y, z, and δ satisfy 0.400≤x<1.000, 0.030≤y≤0.350, 0.001≤z≤0.040, 0.750≤x+y+z<1.000, and -5.00≤δ≤-0.200), and having a volume resistance of 1.0×109 Ω·cm or less. A ferrite resin composite material, ferrite resin composite, and electromagnetic wave absorber containing said ferrite powder.

A magnetic material and method prepares high-performance composite ferrite for a self-biased circulator. The preparation method includes: (1) preparing BaM ferrite initial powder and NiCuZnSn ferrite initial powder, respectively; (2) mixing the BaM ferrite initial powder, the NiCuZnSn ferrite initial powder and deionized water uniformly in proportion, performing ball milling in a high-energy ball mill, and then obtaining mixed powder after primary pre-sintering, secondary pre-sintering and secondary ball milling; and (3) obtaining the high-performance composite ferrite for the self-biased circulator by a low-temperature magnetic field orientation forming technology and magnetic field heat treatment. According to the present invention, the saturated magnetization intensity is enhanced better by compounding the BaM ferrite powder and the NiCuZnSn ferrite powder and through a high-energy ball milling technology, the low-temperature magnetic field orientation forming technology and the magnetic field heat treatment technology, thereby improving the microstructure and the magnetic characteristic of bi-phase composite ferrite.

The invention belongs to the technical field of radio frequency microwave functional components, and particularly relates to a pouring type integrated transformer, an internal matching component and a preparation method thereof, the pouring type integrated transformer comprises a microstrip impedance line of a multilayer spiral structure, a soft magnetic ferrite pouring body located outside the microstrip impedance line, and leading-out terminals arranged at the two ends of the microstrip impedance line; the micro-strip impedance line is arranged on a substrate with a certain dielectric constant requirement and forms a spiral structure along a set path, the micro-strip impedance line and the substrate of the micro-strip impedance line are coated with the soft magnetic ferrite pouring body, the soft magnetic ferrite pouring body is of an integrally formed structure, and the soft magnetic ferrite pouring body is obtained by mixing soft magnetic ferrite powder and a binder, pouring the mixture in a mold and carrying out curing demolding. Through the innovative structural design and preparation process, the technical bottlenecks of large size, low efficiency, inconsistency, difficulty in packaging and the like existing in a traditional manual winding matching mode are overcome, and a feasible technical scheme is provided for miniaturization, high performance and large-scale application of a power amplifier matching network in a radio frequency microwave system.

The invention relates to a manganese zinc ferrite composite material as well as an internal mixing method and application thereof. The manganese zinc ferrite composite material comprises manganese zinc ferrite powder and an additive, the additives comprise a framework material, a binder, a lubricant and an antioxidant; the average particle size D50 of the manganese zinc ferrite powder is 0.95 [mu] m to 1.75 [mu] m. According to the invention, the additive comprising the framework material, the binder, the lubricant and the antioxidant is mixed with the manganese-zinc ferrite powder with the average particle size D50 of 0.95-1.75 [mu] m, and the manganese-zinc ferrite powder with the particle size can be uniformly dispersed in the manganese-zinc ferrite composite material under the combined action of the framework material, the binder, the lubricant and the antioxidant; and therefore, the uniform consistency of internal mixing is guaranteed, the problem that internal mixing is difficult due to the fact that the manganese zinc ferrite powder is small in particle size is solved, the quality of soft magnetic material injection molding products is improved, large-scale production is promoted, and the requirement of the market for high-performance soft magnetic materials is met.

The invention relates to a soft magnetic ferrite powder magnetic core extrusion forming machine, and relates to the technical field of transformer magnetic core pressing, the soft magnetic ferrite powder magnetic core extrusion forming machine comprises a rack and a workbench arranged on the rack, and the rack is also provided with a quantification assembly, a circumferential extrusion assembly and a height extrusion assembly; the height extrusion assembly comprises a lower pressing head arranged on the rack in a lifting mode and a lower die arranged on the workbench. The rack is further provided with a power piece for conducting lifting adjustment on the lower pressing head. The circumferential extrusion assembly comprises an extrusion cylinder arranged on the rack, extrusion blocks arranged on the extrusion cylinder in a sliding mode and a sliding part for conducting sliding adjustment on the extrusion blocks, a circular forming cavity is defined when the multiple sets of extrusion blocks get close to one another, and an extrusion belt is further movably arranged in the extrusion cylinder and is made of an elastic material; and the extrusion belt and the forming cavity are movably consistent in size. The magnetic core pressing device has the advantages that the magnetic core can be pressed in the diameter direction and the height direction during pressing, and therefore the performance of the magnetic core in the diameter direction and the height direction is uniform.

This invention relates to the technical fields of RFID equipment manufacturing and novel magnetic inks, providing a magnetic ink for RFID electronic tags and its preparation method. The magnetic ink comprises bisphenol A epoxy acrylate prepolymer, modified polyester resin, polyamide-imide resin, nano-scale soft magnetic ferrite powder, silver-coated flake copper powder, low-polymerization-degree polyurethane compatibilizer, γ-glycidyl etheroxypropyltriethoxysilane coupling agent, photoinitiator, antioxidant, leveling agent, and reactive diluent monomer. The ferrite powder has a D50 of 0.1-0.3µm and its surface is treated with a phosphate ester-silane double coating. After UV curing, its magnetic permeability is 20-60, and its loss tangent is ≤0.05. This invention's ink possesses excellent magnetic properties, conductivity, and flexibility, effectively improving the tag's electromagnetic response, crack resistance, and printing accuracy. It is suitable for printing high-Q value narrow-linewidth antenna patterns.

The application belongs to the technical field of magnetic material preparation, and particularly relates to a production process of high-performance rare earth permanent ferrite magnetic powder. The process comprises the following steps: preparing iron red and auxiliary materials, wherein the auxiliary materials comprise calcium carbonate, strontium carbonate, lanthanum oxide and cobalt oxide; mixing raw materials in proportion, then performing dry ball milling to obtain mixed materials; performing steam treatment on the obtained mixed materials to make the water content of the mixed materials reach 2-5%, then performing ripening, and the ripening time is at least 30 min, and the ripening process is completed in the screw conveyor; balling; pre-sintering; performing coarse crushing on the pre-sintered materials and sieving to obtain rare earth permanent ferrite magnetic powder. Through steam pretreatment and ripening, the strength and thermal stability of the ball materials are significantly improved, the ball materials remain complete in the kiln, the flowability is good, and the consistency and qualified rate of the product are improved.

The discharge valve comprises a material receiving frame applied to the permanent magnetic ferrite crushing ball mill, a through hole penetrating through and extending to the left side of the material receiving frame is formed in the bottom of the material receiving frame, and mounting plates are welded to the inner walls of the two sides of the through hole. A discharging valve body is installed in a through hole which is formed in the bottom of the material receiving frame and penetrates through the left side of the material receiving frame, installation grooves are formed in the middle of the front portion and the middle of the rear portion of the discharging valve body, a panel is welded to the left side of the discharging valve body, and the discharging valve body is a hollow cuboid. And filtering through holes are formed in the right side, the upper part, the lower part, the front part and the rear part of the discharge valve body. According to the discharge valve of the permanent magnetic ferrite crushing ball mill, the receiving frame, the stop lever, the discharge valve body and the like are arranged, so that permanent magnetic ferrite powder can be quickly filtered by the discharge valve body, the permanent magnetic ferrite powder is automatically separated from a grinding ball, the labor is saved, and the cost is reduced.

The invention discloses an organic matter-based wave-absorbing composite material filled with a two-dimensional ferrite film and a preparation method of the organic matter-based wave-absorbing composite material, and the method comprises the following steps: preparing a ferrite / Sr3Al2O6 / SrTiO3 heterostructure filled with the two-dimensional ferrite film on an SrTiO3 single crystal substrate with the crystal orientation of (100) by using a ferrite target material and an Sr3Al2O6 target material and adopting a pulse laser deposition technology; stripping a ferrite film in the heterostructure by adopting a water dissolving method to prepare a ferrite / PDMS heterostructure; the preparation method comprises the following steps: spin-coating a mixed solution of an organic film on a monocrystalline silicon (Si) substrate by adopting a spin-coating method to prepare an organic film / Si heterostructure; the ferrite / PDMS heterostructure and the organic matter film / Si heterostructure are subjected to hot pressing through a hot pressing method, and the organic matter-based wave-absorbing composite material filled with the two-dimensional ferrite film is prepared. The preparation process of the organic matter-based wave-absorbing composite material is simple, and the prepared organic matter-based wave-absorbing composite material avoids the phenomena that ferrite powder particles are agglomerated and electromagnetic waves bypass the ferrite particles.

The present invention generally relates to a method for synthesizing dysprosium-doped copper-zinc ferrite nanomaterials with enhanced structural and functional properties. The method comprises dissolving stoichiometric quantities of copper nitrate trihydrate, zinc nitrate hexahydrate, iron nitrate nonahydrate, and dysprosium nitrate hexahydrate in distilled water to prepare an oxidizer solution. A fuel mixture is separately prepared using urea and glucose in equal proportions by weight. The oxidizer and fuel mixtures are combined in 1:1 ratio, calculated based on their respective oxidizing and reducing valencies, to form a homogeneous precursor solution. This solution is stirred thoroughly for about one hour and subsequently transferred to a Pyrex dish. The dish is placed in a muffle furnace preheated to approximately 450° C., where the solution undergoes a self-sustained combustion reaction, yielding a fine, porous Cu0.5Zn0.5DyxFe2-xO4 ferrite powder within 20 minutes. The resultant powder is ground to achieve uniform particle distribution suitable for advanced applications.

To solve a problem on an electronic device manufacturing line in which a conventional broadband flat radio wave absorber is affected by reflection from a coating resin in the millimeter wave band, and external vibration or contact can cause carbon or ferrite powder dust to separate and fall from the radio wave absorber.SOLUTION: One side of a cover layer made of an open-cell foamed resin is impregnated with an adhesive, one side of an absorbing layer made of closed-cell or open-cell foamed resin with carbon powder or ferrite powder dispersed therein is coated with the adhesive, and the adhesive-impregnated side of the cover layer and the adhesive-coated side of the absorbing layer are joined together. The foamed resin of the cover layer and the absorbing layer is polystyrene foam, polyurethane foam, or polyethylene foam, and the adhesive is an acrylic adhesive, silicone adhesive, urethane adhesive, or rubber adhesive.SELECTED DRAWING: Figure 1

The invention discloses a preparation method and application of ferrite-based micron-sized flaky microwave absorbent powder, and relates to the technical field of microwave absorbing materials.The preparation method comprises the following steps that S1, ferrite precursor tape casting slurry A is pretreated, and slurry B is obtained; s2, the slurry B is poured into a casting machine for casting, and a casting green tape C is obtained at an outlet of the casting machine; s3, stripping and removing the PET substrate on the tape casting green tape C to obtain a ferrite green tape sheet D; s4, sintering the ferrite green tape sheet D in sintering equipment, and cooling to room temperature to obtain a ferrite sheet E; and step S5, crushing the ferrite sheet E, and performing classified screening treatment to obtain the flaky ferrite absorbent powder. According to the invention, the design is reasonable, the flaky ferrite powder is used as the magnetic absorbent, compared with the traditional flaky carbonyl iron, the ferrite material has obvious lightweight and anticorrosion advantages, the labyrinth effect formed by the flaky structure can further improve the anticorrosion performance of the product, and impedance mismatching caused by eddy current loss is avoided.

The invention relates to the technical field of preparation of manganese zinc ferrite powder, and discloses a preparation process of manganese zinc ferrite powder, which comprises the following steps: S1, adding raw materials, proportioning and mixing the raw materials; s2, cutting: cutting the mixed raw materials in a cutting device; s3, sanding is conducted, specifically, sanding granulation is conducted on the cut materials in a sanding device; s4, pre-sintering: pre-sintering the sprayed raw materials; the cutting structure is used for cutting the raw materials in the inner barrels, and in the process that the cutting structure moves upwards, is pulled out of the corresponding inner barrel and moves downwards again, the next inner barrel containing the raw materials can be automatically switched in the cutting barrel to continue switching, and meanwhile, the cutting structure can be used for cutting the raw materials. When the raw materials are cut, the inner barrel filled with the cut raw materials can be switched to the fifth discharging opening of the sanding barrel to be automatically discharged, sanding work is carried out in the sanding barrel, and therefore the raw material ratio cannot be changed, the preparation quality is improved, and meanwhile the preparation work efficiency is improved.

The present invention developed a composite having a novel structure containing, in a high content, a powder having a radiation-shielding function.　Provided is a composite having a radiation-shielding function and a method for producing the same. The composite comprises a preform made from a mixture containing a liquid silica-based binder and one or more radiation-shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder, the radiation-shielding powder(s) being contained in the range from 3% to 85% in total. All of the voids in the preform are impregnated and filled with molten aluminum and solidification is allowed to occur to form a composite, or 25% or more of the voids in the preform are impregnated with a liquid organic / inorganic sealing agent and solidification is allowed to occur to form a composite. The liquid silica-based binder has properties that allow the preform to be formed at a temperature at which the radiation-shielding powder(s) does not decompose.

A multi-pump servo motor driving module for a ferrite powder press comprises a main driver, a first slave driver and a second slave driver, a power supply port of the main driver is connected with a main servo motor, power supply ports of the first slave driver and the second slave driver are respectively connected with a first slave servo motor and a second slave servo motor, and the first slave driver and the second slave driver are respectively connected with the main driver and the second slave driver. The ferrite powder pressing machine has the beneficial effects that firstly, the ferrite powder pressing machine realizes multi-pump linkage operation, part of procedures can be overlapped and carried out at the same time, the waiting time between the forming procedures is reduced, and the forming period is greatly shortened; secondly, the servo motor pump is used for closed-loop control, oil can be reasonably supplied to different hydraulic pumps according to the requirements of all working procedures, and different moments, angles and speeds needed by different working procedures are matched;

The invention provides a high-stability magnetic core material and a preparation method thereof, and belongs to the technical field of ferrite materials.The preparation method comprises the following steps that raw materials are subjected to primary ball milling and then mixed, and mixed powder is obtained; pressing the mixed powder into a material block, and presintering to obtain MnZn ferrite; the preparation method comprises the following steps: grinding MnZn ferrite to obtain MnZn ferrite powder, and loading nano SiO2 and nano MgO on the surface of the MnZn ferrite powder to obtain coated MnZn ferrite powder; mixing the MnZn coated ferrite powder with Bi2O3, Ta2O5 and SnO2, and carrying out secondary ball milling, so as to obtain doped ferrite powder; mixing and granulating the doped ferrite powder and an adhesive, and pressing into a green body; and sintering the green body to obtain the MnZn ferrite magnetic core material. Volume mutation of the magnetic core material under thermal shock can be counteracted, and the magnetic core material is prevented from cracking after being subjected to thermal shock.

The utility model discloses soft magnetic ferrite powder refining and grinding equipment which comprises a grinding barrel and a hydraulic push rod, the hydraulic push rod is fixed on the ground, a lifting machine head is fixed at the top end of the hydraulic push rod, a grinding spindle is rotatably mounted at one end of the lifting machine head, and a grinding hammer is fixed at the bottom end of the grinding spindle. Supporting frames are fixed to the two sides of the lifting machine head correspondingly, lifting rings are fixed to the bottom ends of the two supporting frames, a plurality of positioning pieces which are symmetrical in pairs are fixed to the outer side of the top end of the grinding barrel, positioning shaft pins are rotationally installed between the positioning pieces which are symmetrical in pairs, and rotary dustproof pieces are fixed to the outer sides of the positioning shaft pins. The outer sides of the two ends of the positioning shaft pin are sleeved with torsion springs. The rotary dustproof pieces are mutually spliced to form the circular ring to seal the gap between the grinding barrel and the grinding hammer, soft magnetic ferrite powder cannot splash outwards in the grinding process of soft magnetic ferrite, health of workers operating equipment is guaranteed, and cleanliness of an equipment workshop is guaranteed.

The invention discloses a snow melting process based on electromagnetic induction heating of a turnout, which comprises electromagnetic induction coils attached to the waist of a turnout steel rail and the side face of a turnout sliding plate, and electronic paste containing graphene, silver, copper, nickel and ruthenium series resistance paste and a dopant prepared by compounding spinel cordierite and ferrite is burnt and injected to the outer sides of the coils. Alternating current is applied to the coil to generate a magnetic field, the inner side magnetic flux enables the steel rail to generate eddy current heating, the outer side magnetic flux enables slurry carriers to migrate to generate Joule heat, and a synergistic heating infrared radiation system is formed. The method has the beneficial effects that ice and snow on the surface of a turnout steel rail, a rail gap and a sliding plate area are synchronously melted, the technology utilizes the infrared radiation characteristics of graphene, spinel cordierite and ferrite powder, original vacant magnetic flux is utilized, the magnetic flux utilization rate is increased, power consumption is reduced, and the snow melting efficiency and reliability are improved.

The invention relates to a preparation method of a YIG-M type barium ferrite mixed material for a microstrip line circulator. The preparation method comprises the following steps: firstly, preparing YIG precursor powder and barium ferrite powder; pressing the YIG precursor powder into a green body, and sintering to obtain phase-formed YIG ferrite; and crushing the YIG ferrite, mixing the crushed YIG ferrite with the barium ferrite precursor powder according to a mass ratio of 1: 2-2: 1, pressing the mixture into a green body, and carrying out sintering phase formation to obtain the YIG-M type barium ferrite mixed material. The external bias magnetic field of the prepared mixed material is far smaller than that of a traditional YIG material, a good circulation effect can be achieved only through a smaller permanent magnet, and a circulator can be further miniaturized and integrated.

The utility model discloses a check valve and a pumping device for low-water content ferrite powder, which relates to the field of magnet production technology and can solve the problem of easy damage of the check valves before and after the pumping device in the prior art. A check valve for low-water content ferrite powder in an embodiment of the utility model comprises: a valve seat assembly, a gate body arranged in the valve seat assembly and slidably connected thereto, and a driving assembly connected to the gate body and used to drive it to reciprocate along the vertical feeding direction, wherein: a feed inlet and a discharge port are respectively arranged on opposite sides of the valve seat assembly, the gate body is located between the feed inlet and the discharge port, and a feed port is arranged on the gate body.

The invention relates to the technical field of transformer manufacturing, in particular to a laminated transformer preparation method and a laminated transformer. The preparation method of the laminated transformer comprises the following steps: respectively preparing ferrite powder and microcrystalline glass ceramic powder into a first green tape and a second green tape by adopting a tape casting process; forming through holes in the first green tape and the second green tape, and filling the through holes with conductive paste; a primary coil layer and a secondary coil layer are printed on the first hole filling green ceramic tape; laminating a plurality of coil hole-filling green ceramic tapes and a plurality of second hole-filling green ceramic tapes according to a preset sequence to form an intermediate electrode layer; laminating a plurality of first green tapes to form a cover layer; stacking the two cap layers and the intermediate electrode layer together to form a block; and sintering the laminated monomers to obtain the laminated transformer. The problems of interface stress concentration and structure cracking caused by difference of thermal expansion coefficients of different materials are effectively solved, and the product yield and reliability are remarkably improved.

Provided is a radio wave absorbing sheet with little variation in radio wave absorption amount associated with temperature changes. A first radio wave absorbing sheet comprises a base material made of an organic substance and a powder supported within the base material. The powder is composed of MnZn ferrite powder, aluminum powder, and silicon carbide powder. When the volume ratio of the MnZn ferrite powder is VM, the volume ratio of the aluminum powder is VA, and the volume ratio of the silicon carbide powder is VS with respect to the entire radio wave absorbing sheet, the silicon carbide occupancy ratio RS1 represented by VS / (VM + VA + VS) is 1.5-41% inclusive.

Provided are: a ferrite powder whereby, when the ferrite powder is applied in a composite material, dropping out of ferrite particles is suppressed without moldability and filling ability being compromised; a ferrite resin composite material; and an electromagnetic shielding material, an electronic material, or an electronic component. This ferrite powder includes at least spherical or polyhedral ferrite particles in which a step structure is provided on surfaces thereof, the step structure having a polyhedral outline in the surfaces of the ferrite particles.

The present invention belongs to the field of wireless charging technology, and specifically relates to a high-frequency low-loss three-dimensional shielding material and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a material composed of Fe bal. M a Cu b M' c Si d B e X f (1) crushing or pulverizing the iron-based nanocrystalline and / or amorphous material, and then subjecting it to annealing and crystallization treatment to obtain nanocrystalline soft magnetic alloy powder; (2) mixing the obtained nanocrystalline soft magnetic alloy powder with ferrite powder and a binder, and then subjecting the mixture to compression molding or injection molding to obtain a high-frequency, low-loss three-dimensional shielding material. The composite shielding material obtained by the present invention can simultaneously possess the high saturation magnetic flux density of nanocrystalline and the low-loss characteristics of ferrite, and can be processed into a three-dimensional shape, thereby reducing leakage magnetic flux in the XY direction and improving the power conversion efficiency.

The application discloses a preparation method of a magnetic high-entropy alloy composite material, and belongs to the technical field of magnetic material preparation. The saturation magnetization intensity of the magnetic high-entropy alloy composite material can reach 153-172 emu / g, the hardness value can reach 200-233 HV, the tensile strength can reach 600-712 MPa, and the coercive force is less than 200 Oe. The preparation steps comprise the following steps: (1) high-entropy alloy powder preparation; (2) ferrite powder preparation; (3) mixing the powders obtained in the steps (1) and (2) with proper additives; (4) loading into a mold and pressure forming; (5) sintering, and the magnetic high-entropy alloy composite material is obtained. The high-entropy alloy magnetic composite material obtained by reasonably controlling the high-entropy alloy composition, the ferrite composition, the proportion of the two components and the sintering process has excellent mechanical properties and outstanding high-frequency magnetic properties.

The invention relates to a method for preparing nano barium ferrite powder, in particular to a method for preparing nano barium ferrite through cooperation of laser annealing and neodymium doping. The method comprises the following steps: S1, preparing a ferrite amorphous strip from raw materials including Fe2O3, BaO, Nd2O3 and B2O3 by utilizing a smelting melt-spinning method; s2, irradiating the ferrite amorphous strip in the step S1 by using laser, and carrying out laser annealing; and S3, carrying out pickling crushing and filtering washing treatment on the annealed strip, and drying to obtain the neodymium-doped nano barium ferrite. According to the preparation method disclosed by the invention, through the synergistic effect of laser annealing and strong absorption of neodymium ions, overgrowth of crystal grains is effectively inhibited, and the particle size distribution of the nano ferrite is narrowed, so that the problems of wide particle size distribution of powder, low production efficiency and the like in the existing preparation technology are solved.

To develop a composite of a new constitution containing a powder having a radiation shielding function in a high content.SOLUTION: Molten aluminum is impregnated and filled into all voids of a preform made of a mixture containing one or more kinds of radiation shielding powders selected from gadolinium oxide, boron carbide, boron oxide, boron, barium sulfate, strontium oxide, tungsten, tungsten oxide, tungsten carbide, molybdenum, molybdenum oxide, iron powder, iron oxide powder, and ferrite powder and a liquid silica-based binder, the mixture containing the radiation shielding powders in a range of 3 to 85% in total; In the composite body having the radiation shielding function and the method for manufacturing the same, a liquid organic-inorganic sealing agent is impregnated and solidified to form the composite body, and a liquid silica-based binder has characteristics capable of forming a preform at a temperature at which the radiation shielding powder is not decomposed.SELECTED DRAWING: None