411 results about "Magnetic composite" patented technology

The invention belongs to the technical field of optical fiber sensors, and particularly relates to a distributed optical fiber magnetic sensor, a preparation method thereof and a distributed measurement system. The optical fiber comprises an optical fiber and a magnetic composite matrix, a magnetic field measurement grating and a temperature compensation grating are arranged on the optical fiber; the magnetic composite matrix is formed by curing a magnetic composite suspension coating the outer side of the magnetic field measurement grating, the magnetic composite matrix comprises cured resin and magnetostrictive material particles uniformly distributed in the cured resin, and the magnetostrictive material particles are arranged in the cured resin in a predetermined orientation manner, so that the space monitoring range is expanded, and the magnetostrictive material particles are uniformly distributed in the cured resin; multi-point parallel measurement is achieved, and the defect that single-point measurement is prone to being disturbed by a local magnetic field is overcome; the technical problems of high precision, low cost, difficulty in deployment and long-section measurement of a magnetic field measurement sensor in the prior art are solved.

The invention relates to a repeatedly detachable magnetic composite water lubricated bearing and a maintenance method thereof.The water lubricated bearing comprises a cylindrical bearing seat surrounding a ship stern shaft and a permanent magnet assembly detachably connected with the bearing seat, a cylindrical sliding bearing is arranged on the inner side of the bearing seat, a notch is formed in the outer side face of the sliding bearing, and the permanent magnet assembly is detachably connected with the bearing seat; the notch penetrates through the sliding bearing in the axis direction of the sliding bearing, a containing groove used for containing the permanent magnet assembly is defined between the notch and the inner side wall of the bearing seat, when the water lubrication bearing is arranged on the outer side of the ship tail shaft in a sleeving mode, the containing groove is located over the ship tail shaft, and the permanent magnet assembly is in sliding fit with the containing groove in the axis direction of the sliding bearing. According to the scheme, the permanent magnet is configured to be in a detachable form, and the permanent magnet can be conveniently maintained after being demagnetized, so that the maintenance cost of the water-lubricated bearing is reduced, and the load of the water-lubricated bearing can be reduced for a long time.

The application relates to the technical field of integrally-formed inductors, in particular to a moisture-resistant soft magnetic composite material and a preparation method thereof and an integrally-formed inductor. The moisture-resistant soft magnetic composite material comprises the following components by mass: 100 parts of soft magnetic powder, 2-5 parts of a resin bonding agent and silicon resin, wherein the mass ratio of the silicon resin to the resin bonding agent is (0.3-2.0):100. The moisture-resistant soft magnetic composite material can avoid the phenomenon of explosion of the integrally-formed inductor during a reflow soldering process after moisture absorption.

The invention relates to the technical field of biomedical materials, in particular to collagen sponge and a preparation method thereof.The preparation method comprises the following steps that under the condition of 4-8 DEG C, silver-containing turbid liquid is added into a collagen solution, ultrasonic treatment is conducted, magnetic stirring is matched at the same time, and a mixed solution is obtained; performing high-pressure homogenizing and refining treatment on the mixed solution to obtain a homogenized solution; freezing the homogenized liquid at-80 DEG C, and then unfreezing at 4-37 DEG C to obtain pretreated homogenized liquid; and carrying out freeze drying on the pretreated homogeneous liquid to obtain the collagen sponge. According to the preparation method disclosed by the invention, a low-temperature ultrasonic-magnetic composite dispersion method is combined with homogenizing treatment, so that silver salt is uniformly dispersed in a collagen solution on the premise of avoiding thermal denaturation of collagen; and then a freezing-unfreezing pretreatment process is combined, so that the hydrogen-bond interaction between the silver salt uniformly dispersed in the collagen solution and the collagen is enhanced, the binding force between the silver salt and the collagen is improved, and sudden release of the silver salt is avoided.

The invention discloses a soft magnetic composite material, a soft magnetic core ring and a preparation method and application thereof. The preparation method of the soft magnetic composite material comprises the following steps: 1) providing raw materials according to the chemical composition of the soft magnetic material; the raw materials are smelted and rapidly hardened, and soft magnetic material master alloy is obtained; the chemical composition of the soft magnetic material is RE2 (FexCo1-x) 14B, and RE is selected from at least one of La, Ce, Pr, Nd, Sm, Eu and Gd; x is the atomic ratio of Fe, 0.7 < = x < = 1; 2) heating the soft magnetic material mother alloy in vacuum to obtain a soft magnetic material phase alloy; (3) the soft magnetic material phase alloy is prepared into powder with the particle size of 75-200 microns, and soft magnetic material powder is obtained; 4) mixing the soft magnetic material powder with an amino compound to obtain mixed powder; and heating the mixed powder under the conditions of protective gas and 300-600 DEG C to prepare the soft magnetic composite material. The prepared soft magnetic composite material is high in effective magnetic conductivity and low in unit volume power loss.

The invention provides a secondary battery and a manufacturing method thereof, a battery device, an energy storage device and a power utilization device, which are at least beneficial to improving the performance of the secondary battery. The manufacturing method comprises the steps that magnetic composite filler comprising an ionic conductor core is prepared, the surface of the ionic conductor core is sequentially coated with a magnetic functional layer and a protective layer, the magnetic functional layer is made of a magnetic material, and the protective layer is made of an oxide; preparing a polymerization precursor comprising the magnetic composite filler, a polymer matrix, an initiator, a lithium salt and a solvent; coating the polymeric precursor under a pulsed magnetic field to form a film, so that the magnetic composite filler is directionally arranged along the thickness direction of a film layer; initiating the polymerization precursor to generate polymerization reaction, so that the polymerization precursor is cured and molded into a solid electrolyte membrane; a positive plate and a negative plate are provided, the positive plate, the solid electrolyte membrane and the negative plate are subjected to winding treatment or lamination treatment and then put into the shell, and an initial battery cell is formed.

The invention discloses a plate flexible laser cutting production line and method integrating uncoiling, flattening and robot grabbing, and belongs to the technical field of metal plate machining. The plate flexible laser cutting production line comprises the steps that S1, an uncoiling and flattening mechanism, a gas-magnetic composite suspension bed and a sorting robot with a Bernoulli gripper are configured; s2, the coiled materials are fed into a suspension bed, the levelness is locked through permanent magnet attraction, and non-contact suspension and locking flat conveying of the plates are achieved in cooperation with the lifting force of a micropore air cushion; s3, laser head follow-up cutting is carried out, and plate local warping caused by thermal stress release is restrained through a permanent magnetic field; and S4, negative pressure lift force is generated through the Bernoulli effect, and when the lift force overcomes the resultant force of the magnetic attraction force, the gravity and the friction force, the workpiece is separated from the crawler belt and stripped from the framework. The air-magnetic composite suspension bed is constructed, the permanent magnet array is used for generating downward background magnetic attraction force, meanwhile, the high-pressure air bellow is used for spraying airflow through the micropore array to generate air cushion lift force, the plate is in a non-contact suspension state, and the risk of surface scratching is remarkably reduced.

The invention belongs to the technical field of preparation of soft magnetic composite materials, and particularly relates to an insulation coating method and application of a soft magnetic powder material. The insulating coating method comprises the following steps: (1) uniformly mixing low-melting-point metal or alloy powder with silica sol, a silane coupling agent and a thermocuring resin glue solution to obtain coating slurry; and (2) uniformly mixing soft magnetic powder with the coating slurry obtained in the step (1), firstly performing hot-pressing curing molding at the temperature of 60-100 DEG C under a vacuum condition, and then performing hot-pressing sintering treatment at the temperature higher than the melting point temperature of low-melting-point metal or alloy powder and under an oxygen-containing atmosphere condition to obtain the insulated and coated soft magnetic powder material. According to the insulating coating method, the advantages of an organic material insulating coating method and an inorganic material insulating coating method are combined, the defects of the organic material insulating coating method and the inorganic material insulating coating method are overcome, and the stability and the insulating coating effect of the insulating coating layer are remarkably improved.

The invention belongs to the technical field of electronic materials, and particularly relates to a FeSiAl soft magnetic composite material and a preparation method thereof.The preparation method comprises the steps that 1, FeSiAl powder, a silane coupling agent and organic silicon resin are mixed to obtain coated powder; (2) carrying out heat treatment on the coated powder to obtain FeSiAl-coated Al2SiO5 powder; and (3) mixing the FeSiAl-coated Al2SiO5 powder with a lubricant, and carrying out annealing heat treatment to obtain the FeSiAl soft magnetic composite material. The FeSiAl soft magnetic composite material prepared by the method has high magnetic conductivity and lower loss, the insulating layer is compact, the corrosion resistance is excellent, and the preparation method is simple in process, simple and convenient in equipment, short in coating treatment time, high in efficiency, low in cost and suitable for large-scale production.

The invention designs a preparation method of a magnetic molecular imprinting-aptamer sandwich fluorescence sensor for detecting kanamycin. And the magnetic molecular imprinting composite material Fe3O4 (at) UiO-66 (at) MIP with a specific adsorption target object KANA is prepared. When a detection target object KANA exists, the Fe3O4-coated UiO-66-coated MIP can rapidly and specifically capture the KANA in a short time. Then, a DNA single-stranded aptamer marked with FAM is added, after the aptamer and KANA captured on the surface of the Fe3O4 at-UiO-66 at-MIP are subjected to specific recognition and magnetic separation again, an aptamer probe can enter sediment along with the magnetic composite material Fe3O4 at-UiO-66 at-MIP, the fluorescence intensity of supernate is reduced, and quantitative analysis is conducted according to the fluorescence difference value delta F. When the KANA does not exist, the aptamer cannot enter the precipitate, so that the fluorescence signal intensity is not changed. Double recognition is formed through specific binding of an MIP imprinting cavity and the aptamer, matrix interference is reduced by means of fluorescence characteristics and magnetic separation capacity, the method has the advantages of being high in adsorption capacity, specific in recognition, high in sensitivity, wide in detection range, good in selectivity and the like, and rapid and accurate detection of KANA in a complex sample can be achieved.

The invention discloses a 2: 17 type rare earth soft magnetic / Fe-based soft magnetic laminated composite material and a preparation method thereof. The method sequentially comprises the following steps: 1) screening 2: 17 type rare earth soft magnetic powder, performing insulation coating, mixing with polyurethane, and performing magnetic field orientation to obtain a thin ring green body; (2) Fe-based soft magnetic powder is sieved and mixed with polyurethane, and then a thin ring green body is obtained through magnetic field orientation; (3) alternately stacking the 2: 17 type rare earth soft magnetic thin ring green bodies and the Fe-based soft magnetic thin ring green bodies in the direction perpendicular to the plane of the thin ring green bodies; and 4) carrying out hot press molding on the laminated soft magnetic composite material. Based on the high-frequency characteristic of the 2: 17 type rare earth soft magnetic material and the high magnetic conductivity characteristic of the Fe-based soft magnetic material, collaborative optimization of the magnetic conductivity and the cut-off frequency is achieved within the ultra-wideband range from MHz to GHz, the problem that the magnetic conductivity of a traditional soft magnetic composite material is attenuated along with the frequency is effectively solved, high-frequency loss is greatly reduced, and the service life of the soft magnetic composite material is prolonged. And a solution is provided for high-frequency soft magnetic components (such as inductors and transformers) with high magnetic performance and low power consumption.

The invention provides a solvent-free resin composition and application thereof, the solvent-free resin composition comprises a functional reinforcing phase and a continuous matrix phase, and the functional reinforcing phase comprises a magnetic composite filler; the magnetic composite filler comprises the following components: (A1) FeMn ferrite and / or carbonyl iron, wherein D50 is 0.1-0.9 [mu] m; (A2) FeMn ferrite and / or carbonyl iron, wherein D50 is 1 to 10 [mu] m; (B) a FeSiCr alloy and / or an iron-based nanocrystal, wherein D50 is 1 to 20 [mu] m. According to the resin composition provided by the invention, the magnetic filler with a specific particle size is introduced, and the specific type of the magnetic filler is limited, so that the resin composition has excellent magnetic performance, high magnetic conductivity and low magnetic loss at high frequency (10MHz-100MHz), and the resin composition is solvent-free, has relatively good stability and can realize high filling property.

The invention belongs to the technical field of bionic cilium sensors, and particularly discloses a magnetic bionic cilium and vesicle complex and a preparation method and application thereof.The preparation method comprises the following steps that S1, a cilium array male mold is prepared; then carrying out oxygen plasma treatment, silanization and curing stabilization; s3, injecting the magnetic composite precursor into a polydimethylsiloxane female die, applying pressure, and striking off; and S4, coating the mold surface with an Ecoflex precursor, performing thermocuring forming, performing magnetization treatment, and performing stripping to obtain the magnetic bionic cilia. According to the magnetic bionic cilia, the vesicle complex and the preparation method and application of the magnetic bionic cilia, the vesicle complex and the preparation method and application of the magnetic bionic cilia, high-magnetic signal output is achieved while the deformability of the cilia is guaranteed, the magnetic bionic cilia is used for non-contact real-time hemodynamic monitoring, meanwhile, specific response release of the vesicle complex is achieved, and a new thought is provided for design of responsive vascular implants.

The invention discloses an elastic support liquid magnetic composite bearing journal bearing which comprises a bearing bush, a base body arranged on the outer side of the circumference of the bearing bush and a support layer arranged between the base body and the bearing bush, the bearing bush comprises a first permanent magnet layer and a lining layer arranged between the first permanent magnet layer and a journal, the lining layer is provided with a liquid film, the liquid film is arranged between the lining layer and the journal, and the first permanent magnet layer is arranged on the lining layer. The first permanent magnet layer comprises a permanent magnet and a protective shell thereof; a second permanent magnet layer is further arranged on the inner side of the circumference of the liquid film, and the supporting layer comprises an elastic layer arranged between the bearing bush and the base body; the elastic layer comprises elastic elements; according to the bearing, the liquid film is arranged between the lining layer and the shaft neck, and the permanent magnets are arranged in the first permanent magnet layer and the second permanent magnet layer, so that a dynamic complementary mechanism of liquid film dynamic pressure and magnetic suspension force is formed, and the comprehensive bearing capacity is improved.

The invention discloses a high-insulativity coating treatment method of a metal soft magnetic composite material, which belongs to the technical field of metal soft magnetic materials, and comprises the following steps: firstly, performing vacuum dehydration treatment on metal soft magnetic powder, and controlling the moisture content to be not higher than 0.1%; carrying out ultrasonic dispersion treatment on the boron nitride nanosheets to form a suspension, and modifying the magnesium borate nanowires and a silane coupling agent for later use; preparing an inorganic coating solution and an organic coating solution; activating the powder in the fluidized bed by adopting radio frequency plasma of argon-oxygen mixed gas; enabling the activated powder to enter a three-fluid nozzle fluidized bed reactor, and implementing synchronous spray coating in two stages: in the first stage, spraying inorganic coating liquid and applying pulse plasma to form a composite bottom layer; in the second stage, spraying organic coating liquid and carrying out ultraviolet precuring to form a resin layer; and the coated powder is treated by a stepped thermocuring procedure to obtain a finished product. The technical problem of how to improve the insulation coating performance of the metal soft magnetic composite material is solved.

The application provides a quartz sand acid washing waste liquid resource treatment method, and belongs to the field of industrial waste water treatment, and comprises the following steps: adding magnetic composite seeds to the quartz sand acid washing waste liquid, and performing magnetic separation after stirring treatment; adding soluble potassium salt to the treated waste liquid to recover potassium fluosilicate; treating the filtrate through diffusion dialysis to obtain recovered acid and dialysis residual liquid; the diffusion dialysis treatment adopts an asymmetric membrane, the asymmetric membrane has a physical gradient of one side being a dense structure and the other side being a loose structure, and the dense structure side is in contact with the waste liquid; and adding calcium oxide or calcium hydroxide to the dialysis residual liquid for deep treatment and calcium recovery. The application provides a quartz sand acid washing waste liquid resource treatment method which is low in treatment cost, high in resource recovery rate and friendly to the environment, and realizes the differentiated resource recovery of the quartz sand acid washing waste liquid.

The invention discloses a FeNi soft magnetic composite material based on tetrabutyl orthosilicate hydrolysis coating and a preparation method of the FeNi soft magnetic composite material. According to the method, through a controllable sol-gel process, tetrabutyl orthosilicate is hydrolyzed to generate SiO2 gel, then a uniform and ultrathin SiO2 gel layer is generated on the surface of FeNi powder in situ, and then heat treatment densification is performed to obtain the FeNi soft magnetic composite material coated with SiO2 in an insulation mode. The SiO2 insulating layer is firmly combined with the matrix metal powder, the thermal stability is good, high frequency and high resistivity are achieved, and meanwhile dilution of non-magnetic relative magnetic performance is reduced to a great extent. The final magnetic core is obtained through compression molding and annealing heat treatment, has the excellent characteristics of high effective magnetic conductivity and low high-frequency magnetic core loss, and is particularly suitable for various efficient and miniaturized power electronic devices in the MHz frequency band.

The invention provides a magnetic composite material and a preparation method and application thereof. The preparation method comprises the steps that mixed dispersion liquid containing a magnetic material, a magnesium source, a phosphorus source and a solvent is provided, the phosphorus source contains phosphate radicals or can be decomposed into phosphate radicals in the solvent, the pH value of the mixed dispersion liquid is controlled to be 7-12, the magnesium source and the phosphorus source are subjected to a chemical reaction, and the magnetic material is obtained. A magnesium-containing coating layer is formed on the surface of the magnetic material, the magnesium-containing coating layer contains Mg, P and O elements, and the magnetic composite material is obtained. According to the preparation method provided by the invention, the magnesium-containing coating layer which is uniform, compact, high in binding force and hard can be formed on the surface of the magnetic material, and the magnesium-containing coating layer is excellent in high-temperature resistance and high-pressure resistance and is not easy to crack in the hot-pressing treatment process.

The application provides a method for preparing a soft magnetic composite material curing curve, comprising the following steps: preparing a magnetic ring, wherein the material of the magnetic ring comprises a soft magnetic composite material; heating the magnetic ring at different temperature values; testing the crushing strength of the magnetic ring at different heating times at each temperature value; determining the optimal curing time of the soft magnetic composite material at the temperature value according to the crushing strength; and preparing a soft magnetic composite material curing curve according to the crushing strength and the optimal curing time. The soft magnetic composite material curing curve prepared according to the application can shorten the curing time of the soft magnetic composite material, thereby improving the production efficiency. The application also provides a soft magnetic composite material curing curve prepared by the preparation method.

The application provides a semiconductor structure preparation method, a semiconductor structure and a memory. The semiconductor structure preparation method comprises the following steps: providing a substrate; sequentially forming a magnetic composite layer and a transfer mask layer on the substrate; performing a plurality of mask etching processes on the transfer mask layer to form a plurality of mask patterns arranged in an array in the transfer mask layer, and the transfer mask layer between at least part of the mask patterns forms a transfer pattern; and etching the magnetic composite layer along the transfer pattern to form a plurality of columnar structures arranged in an array, and the columnar structures form magnetic tunnel junctions. Adjacent columnar structures are isolated by gaps. The application facilitates the preparation of a semiconductor structure with high-density magnetic tunnel junctions, and can effectively adjust the size of the magnetic tunnel junctions and reduce the difficulty of preparing the semiconductor structure.

The invention discloses myricetin-loaded bone-targeted magnetic composite nanoparticles and a preparation method thereof. The preparation method comprises the following steps: step 1, preparing nanoparticles taking ferroferric oxide as an inner core; step 2, preparing magnetic mesoporous silica nanoparticles with ferroferric oxide as an inner core according to the nanoparticles prepared in the step 1; step 3, performing amination modification treatment on the surfaces of the magnetic mesoporous silica nanoparticles prepared in the step 2 to obtain magnetic mesoporous silica modified nanoparticles; step 4, preparing a ketal thiol-polyethylene glycol-aspartic acid hexapeptide molecule; and step 5, loading myricetin on the magnetic mesoporous silica modified nanoparticles prepared in the step 3, and blocking myricetin by using the ketal thiol-polyethylene glycol-aspartic acid hexapeptide molecules prepared in the step 4 after loading. The invention further discloses application of the compound in image tracing in osteolysis and treatment drugs.

The invention discloses multicolor optical anti-counterfeiting alumite and a production process thereof. The alumite sequentially comprises a magnetic-sensitive enhanced substrate layer, a dynamic separation layer, a temperature-magnetic composite nanofiber multicolor layer, a polyelectrolyte alternate deposition barrier layer and a gradient magnetic-sensitive aluminized layer from bottom to top, wherein the magnetic-sensitive enhanced substrate layer, the dynamic separation layer, the temperature-magnetic composite nanofiber multicolor layer, the polyelectrolyte alternate deposition barrier layer and the gradient magnetic-sensitive aluminized layer are arranged on the alumite; wherein the magnetic-sensitive enhanced substrate layer comprises a graphene modified PET supporting layer and a three-dimensional net-shaped micro-channel embedded with Fe3O4 particles, the dynamic separation layer is temperature-sensitive phase change fluororesin, the temperature-magnetic composite nanofiber colorful layer is electrostatic spinning nanofibers of a core-sheath structure, and the blocking layer is of a polyelectrolyte alternate deposition structure and is embedded with infrared invisible identification particles. According to the invention, four anti-counterfeiting functions of multicolor optical response, magnetic response activation and infrared invisible two-dimensional codes are integrated, the advantages of high multicolor optical contrast, fast response, multiple reuse times, excellent barrier performance, stable transfer printing and the like are achieved, the method is suitable for scenes of high-end tobacco and wine, luxury packaging, high-added-value labels and the like, and the anti-counterfeiting grade and the practicability are obviously improved.

The application belongs to the technical field of soft magnetic composite material preparation, and particularly relates to an insulation coating method for soft magnetic powder material and application. The insulation coating method comprises the following steps: (1) uniformly mixing low-melting-point metal or alloy powder, silica sol, silane coupling agent and hot curing resin glue solution to obtain coating slurry; (2) uniformly mixing soft magnetic powder and the coating slurry of step (1), and then performing hot-pressing curing forming at a temperature of 60-100 DEG C and under vacuum condition, and then performing hot-pressing sintering treatment under a temperature higher than the melting point of the low-melting-point metal or alloy powder and under an oxygen-containing atmosphere condition to obtain the insulation-coated soft magnetic powder material. The insulation coating method of the application combines the advantages of the organic material insulation coating method and the inorganic material insulation coating method, overcomes the respective defects, and significantly improves the stability and insulation coating effect of the insulation coating layer.

The invention relates to the technical field of soft magnetic materials, and discloses a soft magnetic composite material, a preparation method thereof and a magnetic element, and the preparation method of the soft magnetic composite material comprises the following steps: dissolving an iron source, a silicon source and a complexing agent in a first solvent to obtain sol; soft magnetic particles are dispersed in the sol, aging and first sintering are sequentially carried out on the sol, the first sintering is carried out in a reducing atmosphere, a coating layer coating at least part of the surface of the soft magnetic particles is generated, and the coating layer comprises Fe2SiO4. The coating layer comprises Fe2SiO4, so that the insulating property and the magnetism of the soft magnetic composite material are balanced, the soft magnetic composite material has high insulating property and magnetism, the structural stability and the magnetic stability of the soft magnetic composite material are improved, and the soft magnetic composite material is suitable for a wider temperature range.

This invention discloses a carbon-coated Fe-Co-Ni-B magnetic micron alloy particle, its preparation method, and its application. The method includes the following steps: dissolving iron acetylacetonate, cobalt acetylacetonate, and nickel acetylacetonate in anhydrous ethanol, then adding cyclopentylboric acid and dissolving it to obtain a mixed solution; subjecting the mixed solution to a solvothermal reaction; and after post-treatment to obtain boron-doped pre-decomposition precursor powder. A glucose aqueous solution is then added dropwise to the pre-decomposition precursor powder under stirring and mixed uniformly to ensure uniform adsorption and coating of the glucose solution on the powder surface. The powder is then dried to obtain a glucose-coated composite precursor. The composite precursor is subjected to programmed temperature heat treatment under an inert or weakly reducing atmosphere to obtain carbon-coated Fe-Co-Ni-B magnetic micron alloy particles with a core-shell structure. This invention successfully prepares a magnetic composite material possessing high saturation magnetic properties, good chemical stability, and controllable magnetic properties.

The invention discloses an iron-based soft magnetic composite material and a preparation method thereof, and relates to the technical field of soft magnetic composite materials. The preparation method comprises the following steps: carrying out heat treatment on gas-atomized FeSi powder, and mixing the gas-atomized FeSi powder with FeNi particles to obtain core-shell FeSi-coated FeNi composite powder; then, phosphoric acid and organic matter are adopted for conducting insulation treatment on the core-shell type FeSi-coated FeNi composite powder, and then an insulation FeSi-coated FeNi material is obtained; and finally, mixing the FeSi-coated FeNi soft magnetic powder core with a lubricant, and performing pressing and staged heat treatment to prepare the FeSi-coated FeNi soft magnetic composite material with low magnetic powder core loss and high direct current bias characteristic.

The application discloses a kind of detection flavonoid compound magnetic composite material, preparation, detection method and the application of preparation standard substance, belong to analytical chemistry technical field.Magnetic composite material includes magnetic nanoparticle core, double lanthanide series metal organic framework (MOF) first shell and covalent organic framework (COF) second shell successively coated on its surface, and phenylboronic acid group grafted on the surface of second shell.The material uses the specific covalent binding of phenylboronic acid and the characteristic ortho-diphenol hydroxyl group of flavonoid compound to realize efficient capture and enrichment;Through double lanthanide series MOF shell, promote energy transfer, COF shell provides high specific surface area and ordered diffusion channel, and magnetic core is convenient for rapid separation, which realizes high selectivity identification of flavonoid compound.The material has the advantages of high sensitivity, strong anti-matrix interference ability, rapid and simple detection, etc., and is suitable for accurate analysis of flavonoid compound in complex sample and development of related standard substance.

The application provides a micro soft magnetic composite axial flux motor, and relates to the technical field of motors, and aims at solving the technical problems of large volume and poor heat dissipation effect of the axial flux motor in the prior art. The micro soft magnetic composite axial flux motor comprises a rotating shaft, a stator assembly and two rotor assemblies. The stator assembly comprises a PCB substrate, a plurality of soft magnetic composite cores and a plurality of coils. The PCB substrate is arranged on the rotating shaft. The PCB substrate is provided with a planar connection circuit. The upper and lower end surfaces of the PCB substrate are both provided with a plurality of soft magnetic composite cores at equal intervals in the circumferential direction. Each soft magnetic composite core is provided with an annular closed groove in the circumferential direction. Each groove is wound with a coil. The two ends of each coil are connected to the PCB substrate and electrically connected to the planar connection circuit. The two rotor assemblies are arranged on the rotating shaft and located on the upper and lower sides of the stator assembly. Each rotor assembly comprises a rotor back iron and a plurality of permanent magnets. The plurality of permanent magnets are arranged in the mounting grooves of the rotor back iron at equal intervals in the circumferential direction.

The invention discloses an iron-based nanocrystalline soft magnetic composite material with high saturation flux density, high frequency and low loss. The iron-based nanocrystalline soft magnetic composite material has the chemical composition of FeaCobSicBdPeCufNbg, wherein 72 < = a < = 75, 0 < = b < = 3, 0 < = c < = 9, 0 < = d < = 10, 0 < = e < = 4, 0.5 < = f < = 0.7, 1 < = g < = 1.5, and a + b + c + d + e + f + g = 100. The invention further discloses a preparation method of the iron-based nanocrystalline soft magnetic composite material. The preparation method comprises the following steps that (1) iron-based amorphous alloy powder with the target particle size is obtained based on alloy smelting and atomization powder making; (2) adding the iron-based amorphous alloy powder into an organic solvent containing organic resin, and forming an organic resin coating layer outside the iron-based amorphous alloy powder under continuous ultrasonic oscillation; after coating, drying the powder, and carrying out cold press molding to obtain a green body; and (3) carrying out transverse magnetic field heat treatment on the green body at high temperature to obtain the iron-based nanocrystalline soft magnetic composite material.

In an aspect of the present invention, a new active optic is provided, namely, a photo-magnetically actuated deformable mirror (PMADM) made of a magnetic composite structure and an optical quality substrate layer. The magnetic layer is composed of Polydimethylsiloxane (PDMS) and powdered ferromagnetic CrO2. A magnet may be used to deform the mirror surface. The powdered CrO2 has a low Curie temperature (preferably around 395 K) which allows changing the magnetization of the magnetic layer using a laser heating source, thus providing control over the deformation. In one embodiment, the structure has an overall dimension of 1.2 inch 1.2 inch 175 μm with an optical pupil diameter of 8 mm. The PMADM is estimated to deform to a maximum stroke of 8.7731 μm before failure with a 3 safety factor.