816 results about "Magnetic composite" patented technology

The invention discloses a non-contact magnetoelectric composite current sensor with magnetism gathering and magnetic shielding. A sensor core is composed of a magnetoelectric sensing element, a magnetofluid layer, a magnetism gathering structure and a magnetic shielding layer. The magnetoelectric sensing element is made of manganese-doped lead magnesium niobate and amorphous alloy film composite materials, the outer side of the sensing element is coated with a magnetofluid layer made of soft magnetic composite materials, the magnetism gathering structure is made of permalloy materials with high magnetic conductivity and is divided into an upper part and a lower part, the upper part accommodates the sensing element and the magnetofluid layer, and the lower part accommodates the magnetic gathering structure. And the lower part is provided with a standardized groove for placing a conductor to be tested. The outermost layer is a magnetic shielding layer composed of multiple layers of nanocrystalline alloy strips, the vertical split type design is also adopted, and it is ensured that the magnetic shielding layer is tightly matched with the magnetic gathering structure through precision machining. The upper magnetic shielding layer and the lower magnetic shielding layer are detachably connected, and field installation is facilitated. The overall structure is compact, a circuit does not need to be disconnected during installation, and the device is especially suitable for on-line current monitoring requirements in the fields of smart grids, industrial automation and the like.

The invention discloses a nano metal oxide insulating material coated soft magnetic composite material and a preparation method thereof, and the preparation method comprises the following steps: (1) putting metal soft magnetic powder and a nano metal oxide insulating material into a steel cylinder equipped with a rotating blade, and rotating the blade to drive the raw material to flow to obtain core-shell composite powder; (2) carrying out annealing treatment on the core-shell type composite powder to obtain a precursor; and (3) mixing the precursor and a lubricant, then pressing the mixture into a green body, and carrying out annealing heat treatment on the green body in a protective atmosphere to obtain the soft magnetic composite material. The prepared soft magnetic composite material is uniform in insulating layer and high in coverage rate, the binding force between the nano metal oxide and the metal soft magnetic matrix is high, the thickness of the coating layer is controllable, the obtained soft magnetic composite material has high magnetic conductivity and lower loss, and the insulating coating method is mild in process condition, simple in equipment, short in coating treatment time, high in efficiency, low in cost and suitable for industrial production. The method is suitable for large-scale production.

A method for improving the fatigue performance of a titanium alloy seamless tube. The method comprises: S1, mixing raw materials, pressing same into a plurality of electrode blocks, and welding the plurality of the electrode blocks to obtain a consumable electrode; S2, smelting the consumable electrode 2-3 times by using a vacuum consumable electrode arc furnace, so as to obtain a titanium alloy cast ingot; S3, upsetting and drawing the cast ingot multiple times and rolling same into a titanium alloy bar; S4, subjecting the bar to precision forging, with the amount of times of heating being no more than twice; S5, annealing and straightening same, followed by turning and drilling treatments, so as to obtain a rough blank of a titanium alloy seamless tube; S6, subjecting same to multi-pass cold rolling, so as to obtain a semi-finished titanium alloy seamless tube product; S7, performing vacuum annealing and acid pickling; S8, performing electrolytic-magnetic composite polishing; and S9, performing a shot blasting treatment. The method can effectively improve the rotating bending fatigue performance, and the titanium alloy seamless tube can endure 20 million test cycles.

The invention relates to the technical field of motor rotors, and discloses a motor rotor and a machining method thereof.The method comprises the steps that hot forging is conducted on an alloy steel base material based on the preset forging and pressing temperature, and multi-layer gradient cutting is conducted on a rotor initial blank; the method comprises the following steps: performing composite deposition treatment on a cylindrical blank based on a magnetic material, placing the magnetic composite blank in a vacuum environment for dynamic heat treatment, performing dynamic balance finishing on the heat treatment blank based on a preset alloy, performing surface strengthening treatment on a balance rotor in a nitrogen atmosphere, and coating the balance rotor subjected to surface strengthening with a preset coating, the motor rotor with the optimized surface is obtained; and dynamic balance trimming is combined with preset alloy characteristics for microstructure regulation and control, and it is ensured that the rotor has excellent operation stability in a high-rotation-speed environment. And finally, surface strengthening treatment is carried out in a nitrogen atmosphere, and a functional coating is used for covering, so that the wear resistance and corrosion resistance of the surface layer are remarkably improved, and the requirements of a motor system on a high-performance rotor under complex working conditions are met.

The invention provides an axial magnetic field modulation type magnetic gear applying a T-shaped modulation ring structure, which belongs to the field of motors and comprises a high-speed permanent magnet rotor, a low-speed permanent magnet rotor and a T-shaped modulation ring. The modulation ring comprises a plurality of T-shaped magnetic modulation pole pieces and T-shaped non-magnetic composite material pole pieces which are alternately arranged and bonded in the circumferential direction. The high-speed permanent magnet rotor and the low-speed permanent magnet rotor each comprise a rotor iron core composed of a plurality of rotor yokes, and N-pole permanent magnets and S-pole permanent magnets embedded between the adjacent rotor yokes in the circumferential direction. The high-speed permanent magnet rotor and the low-speed permanent magnet rotor coaxially sleeve the modulation ring on the two sides of the modulation ring respectively, and form radial and axial air gaps with the modulation ring. Leakage flux at the inner peripheral ends of the rotor yokes of the high-speed and low-speed permanent magnet rotors can enter the T-shaped modulation rings to be linked with magnetic flux generated by the corresponding rotor permanent magnets, the leakage flux at the inner peripheral ends of the rotor yokes on the two sides is reduced, the high-speed and low-speed rotors coaxially rotate, the air gap flux density can be increased, and therefore the gear output torque and the torque density are improved; meanwhile, the modulation ring is easy to process and compact in structure.

According to the preparation method and application of the metal soft magnetic composite material, the surface of the metal soft magnetic powder is coated with the metal oxide insulating layer through the ALD technology, then the characteristics that the ferrite phase layer is high in resistivity, low in loss and good in high-frequency characteristic are utilized, insulating coating is conducted on the surface through the ALD technology, and the metal soft magnetic composite material is obtained. And a ferrite coating layer is formed on the surface of the metal soft magnetic powder during high-temperature annealing, so that electric contact among particles is blocked, the resistivity of the soft magnetic material is improved, and the eddy-current loss at high frequency is reduced, thereby improving the high-frequency performance.

Disclosed are an iron-based nanocrystalline soft magnetic alloy powder, a soft magnetic composite material, and a preparation method therefor. The atomic percentage molecular formula of the iron-based nanocrystalline soft magnetic alloy powder is: FeaBbCcSidCueMmQqZzXx, M being at least one of Co and Ni, Q being at least one of a pre-transition element, a semi-metal element, a rare earth element and Al, Z being at least one of Au, Ag and a platinum group metal element, X being at least one of O, N, S and a halogen element, 70≤a+m≤75, 8≤b≤18, 0≤c≤5, 10≤d≤15, 0≤m≤10, 1.3≤e≤2.5, 0≤q≤2, 0≤z≤1, 0≤x≤0.2, 22≤b+c+d≤30, and a+b+c+d+e+m+q+z+x=100. The soft magnetic composite material is composed of the described iron-based nanocrystalline soft magnetic alloy powder, an alloy-state soft magnetic powder, a binder and the like. The provided iron-based nanocrystalline soft magnetic alloy powder and soft magnetic composite material exhibit excellent soft magnetic performance, good processability and low cost.

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 discloses a preparation method and application of a magnetic enrichment composite SERS (Surface Enhanced Raman Scattering) detection chip, gold nanoparticles are electrostatically adsorbed on the surface of a magnetic ferroferric oxide nanoring, the prepared material is subjected to cyclodextrin modification, nanogaps among the gold nanoparticles form hot spots, a local electromagnetic field enhancement effect is generated, and the magnetic enrichment composite SERS detection chip is obtained. The cyclodextrin molecules adsorb PAHs in the environment through a hydrophobic effect and are fixed in an electromagnetic field enhancement area, amplification of Raman signals is achieved, the magnetic material serves as a carrier, aggregation of gold nanoparticles can be effectively prevented, SERS signals can be further enhanced through a magnetic enrichment effect, and therefore, the method has the advantages that the method is simple, and the application prospect is wide. The high-sensitivity and high-selectivity detection of PAHs in the tail gas of the engineering machinery vehicle is realized by constructing the magnetic composite SERS nano sensing chip.

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 utility model discloses polishing equipment which comprises a polishing wheel, a magnet, a first driving device and a second driving device. The radial side face of the polishing wheel is a polishing face, the magnetic field generating device comprises a plurality of magnets, the magnets are distributed in the first direction, the first direction is parallel to the axial direction of the polishing wheel, and the magnetic field generating device is arranged in the polishing wheel and used for generating a magnetic field on the polishing face so that the magnetic composite fluid can be attracted to the polishing face. The first driving device is connected with the polishing wheel; the second driving device is connected to the magnet; and the first driving device and the second driving device can enable the polishing wheel and the magnet to rotate at different rotating speeds. The magnetic field generating device can generate a dynamic magnetic field on the polishing surface, so that the magnetic composite fluid on the polishing surface is more uniform, the magnetic composite fluid of each flexible grinding head is more uniform, the polishing effect is improved, meanwhile, the abrasion speed of each flexible grinding head can be reduced, the liquid supplementing frequency is reduced, and the polishing efficiency is improved.

The invention provides a stationary phase for DNA synthesis and a preparation method and application thereof. The preparation method of the stationary phase for DNA synthesis, provided by the invention, comprises the following steps: S1, preparing nano magnetic ferroferric oxide particles, and coating the surfaces of the nano magnetic ferroferric oxide particles with SiO2 layers to obtain a nano magnetic composite material Fe3O4-SiO2; s2, carrying out azide group modification on the surface of the nano magnetic composite material Fe3O4 (at) SiO2 to form a surface-modified nano magnetic composite material Fe3O4 (at) SiO2 (at) N3; and S3, loading the initiator to the surface of the surface-modified nano magnetic composite material Fe3O4 (at) SiO2 (at) N3 through Click reaction to obtain the stationary phase for DNA synthesis. The stationary phase provided by the invention can be used for DNA synthesis, and has the characteristics of high bonding strength, good stability, difficult shedding of initiators, high DNA synthesis yield and the like.

Embodiments herein relate to a semiconductor device which includes one or more voltage regulator (VR) chiplets coupled to a package interposer, where the package interposer includes coaxial magnetic composite core inductors to provide power to one or more load die. In one possible configuration, the one or more VR chiplets are coupled to the bottom side of the package interposer, the bottom side of the package interposer is coupled to the top side of a motherboard, and the one or more load die are coupled to the top side of the package interposer. In another possible configuration, the one or more VR chiplets are coupled to the bottom side of the package interposer, the top side of the package interposer is coupled to the bottom side of a motherboard and the one or more load die are coupled to the top side of the motherboard.

The invention provides an aero-engine blade maintenance method and system, a robot and a medium, the method is applied to a micro maintenance robot, and the method comprises the steps that when the rotating speed of an aero-engine is not lower than the preset rotating speed, a magnetic-gas composite driving module is used for obtaining a first moving path according to an edge intelligent center system; moving to a blade detection position of the aero-engine blade corresponding to the first moving path; when the moving stop position of the micro maintenance robot is the blade detection position, the bionic reversible adsorption layer in the adsorption state is adsorbed to the blade detection position; detecting first leaf detection data of a leaf detection area corresponding to the leaf detection position by using a multispectral sensing module, and obtaining a repair strategy based on the first leaf detection data; and a repair module is utilized to perform repair operation on the to-be-repaired blade area in the blade detection area according to the repair strategy. In this way, the detection function and the repair function are integrated, and the purposes of rapid detection and minimally invasive repair are achieved.

The invention relates to the field of composite fibers, in particular to a core-shell type gradient magnetic composite fiber and a spinning method thereof.The core-shell type gradient magnetic composite fiber comprises a magnetic core layer and a magnetic core layer which are sequentially compounded from inside to outside, and the magnetic core layer comprises a thermoplastic polymer matrix and first magnetic particles dispersed in the thermoplastic polymer matrix; the middle transition layer is formed by coating the magnetic core layer with an elastomer material, and second magnetic particles are dispersed in the middle transition layer; the outer functional layer is composed of an antibacterial skin-friendly polymer; wherein the weight percentage of the first magnetic particles is higher than that of the second magnetic particles, and a magnetic intensity gradient decreasing structure from the core layer to the outer layer is formed. By means of the innovative core-shell gradient structure design, the technical problem that the mechanical property of traditional magnetic fibers is sharply reduced under the high magnetic content is successfully solved.

The invention provides an iron-based nanocrystalline soft magnetic composite material and a preparation method, and the iron-based nanocrystalline soft magnetic composite material is prepared by sequentially carrying out low-temperature destressing heat treatment, medium-temperature nucleation heat treatment and high-temperature crystal nucleus growth heat treatment on an iron-based soft magnetic composite material green body, the iron-based soft magnetic composite material green body is prepared by mixing iron-based amorphous magnetic powder, an insulating material and an organic binder and carrying out cold pressing, and the iron-based amorphous magnetic powder is Fe-based amorphous alloy containing Cu. The method has the advantages that through a multi-stage heat treatment mode, fine nanocrystalline can be separated out in an amorphous matrix of magnetic powder, aging decomposition failure of an insulating layer can be reduced, meanwhile, internal stress of the composite material can be fully released, and therefore the iron-based nanocrystalline soft magnetic composite material high in magnetic conductivity and low in loss can be obtained.

The present invention relates to the technical field of preparation of adsorbent materials for removing heavy metals from acidic wastewater, specifically a method for preparing a resin-based magnetic composite adsorbent material, comprising the following steps: using waste expanded resin as a base carrier, ferric chloride as an added magnetic auxiliary substance, mixing magnesium sulfate and aluminum sulfate evenly, stirring at high speed and ultrasonic dispersion, then adding sodium phosphite and sodium hypophosphite and placing them in a microwave reactor, adjusting the pH of the sodium phosphite and sodium hypophosphite in the reactor to precipitate, while the phosphite intercalates into the precipitate, finally filtering the precipitate and washing and drying to obtain a novel adsorbent material for excellent adsorption of heavy metals in acidic mine wastewater. The material prepared by the present invention can effectively adsorb various heavy metal ions such as cadmium, chromium, zinc, lead, manganese, copper, etc. in acidic mine wastewater, has a large adsorption capacity, and the adsorbent material has magnetism and can be regenerated by solid-liquid separation through magnetism.

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 an assembly method of a motor, a vehicle and a rotor, the motor comprises a shell, and a stator core, a stator winding and a rotor which are arranged in the shell, two end surfaces of the stator core are respectively provided with a stator groove, and the stator winding is arranged in the stator groove; rotors are arranged at the two ends of the stator core respectively, each rotor comprises a back plate, a pressing plate and a sheath, and a soft magnetic composite element is fixed on each back plate; the pressing plate is arranged on the back plate and is used for fixing a plurality of magnetic steels; each magnetic steel is of an asymmetric structure relative to the radial direction of the rotor; the sheath sleeves the peripheries of the plurality of magnetic steels. Therefore, the magnetic steel is designed into an asymmetric structure, and the magnetic steel outer ring and the magnetic steel inner ring are staggered at a certain angle in the circumferential direction, so that the cogging effect can be effectively reduced, the cogging torque and the torque pulsation of the motor are reduced, and the NVH performance of the motor is improved. And meanwhile, the soft magnetic composite element is additionally arranged in the rotor, so that iron loss and eddy-current loss can be reduced.

The invention relates to the field of water purifying agents, and discloses a polyaluminum chloride water purifying agent for printing and dyeing wastewater and a preparation method thereof.The polyaluminum chloride water purifying agent for printing and dyeing wastewater is prepared from polyaluminum chloride, an adsorption additive, magnetic composite filler and the balance deionized water; the adsorption additive is prepared by ultrasonically compounding a modified ZIF-8 coated iron material and modified nano titanium dioxide; the modified ZIF-8 coated iron material is prepared by coating nano zero-valent iron with ZIF-8 and carrying out high-temperature carbonization. The modified nano titanium dioxide is prepared by doping and modifying cerium; the magnetic composite filler is prepared by the following steps: pretreating sepiolite by using hydrochloric acid, then coating the surface of the pretreated sepiolite with chitosan by adopting a coprecipitation method, and loading ferroferric oxide particles into the chitosan. Therefore, the usage amount of polyaluminum chloride is reduced, and the water purifying agent is endowed with excellent photocatalytic activity and adsorption effect in printing and dyeing wastewater.

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. According to the method, water atomized iron powder with different particle sizes is adopted for particle size grading, so that pores among iron powder with large particle sizes are filled with iron powder with small particle sizes, after fine reduction treatment is conducted on the iron powder, passivating treatment is conducted on the iron powder subjected to fine reduction treatment through a phosphoric acid solution, and phosphatized iron powder is obtained; the preparation method comprises the following steps: preparing an iron-based soft magnetic composite material, carrying out insulation treatment by using aminopropyltriethoxysilane and tetraethoxysilane to obtain insulated iron powder, adding a lubricant, and carrying out pressing and annealing to obtain the iron-based soft magnetic composite material. When the soft magnetic composite material is prepared, during compression molding, the surface insulation coating layer is less damaged, and after annealing, the soft magnetic composite material is good in insulation performance and low in magnetic loss. In addition, the aminopropyltriethoxysilane and the tetraethoxysilane are adopted for insulation treatment together, and a synergistic effect is achieved on reduction of the magnetic loss of the iron-based soft magnetic material.

The invention discloses a ganoderma lucidum extraction method based on a reusable magnetic enzyme. The ganoderma lucidum extraction method comprises the following steps: S1, preparing a nanoscale amination modified Fe3O4-SiO2 magnetic composite carrier; s2, on the basis of the amination modified Fe3O4-SiO2 magnetic composite carrier, cellulase is added, and a magnetic immobilized enzyme buffer solution is obtained; s3, the ganoderma lucidum sporocarp is put into a magnetic immobilized enzyme buffer solution to be subjected to enzymolysis, extraction and filtration, effective components of ganoderma lucidum are obtained, and magnetic immobilized enzyme is recycled for repeated utilization; according to the method, the magnetic nanoparticles are modified, so that the surfaces of the magnetic nanoparticles have specific active groups, meanwhile, the magnetic response advantage of an inorganic magnetic material is reserved, the nanoscale amination-modified Fe3O4-SiO2 magnetic composite carrier is prepared, enzyme molecules can be directly anchored on the surfaces of the magnetic nanoparticles, and enzyme activity is improved. The immobilized enzyme can be conveniently recycled from a reaction system, so that the cost of an enzyme preparation can be reduced, and the enzyme activity stability can be improved.

The invention relates to the field of catalyst separation, and discloses functional magnetic composite microspheres, a preparation method and application thereof, and a method for removing a noble metal catalyst from a hydrogenated butadiene-acrylonitrile rubber solution. The functional magnetic composite microsphere comprises magnetic nanoparticles and a SiO2 coating layer coating the surfaces of the magnetic nanoparticles, a functional group is grafted on the surface of the coating layer; on the basis of the weight of the functional magnetic composite microsphere, the content of the functional group is 0.01-5 mmol / g; the functional magnetic composite microsphere is used for removing a metal catalyst in a hydrogenated butadiene-acrylonitrile rubber solution. According to the functional magnetic composite microsphere, the noble metal catalyst in the hydrogenated butadiene-acrylonitrile rubber liquid is adsorbed, magnetic separation of the noble metal catalyst is achieved under the condition that the hydrogenated butadiene-acrylonitrile rubber liquid is not polluted, and the noble metal catalyst in the hydrogenated butadiene-acrylonitrile rubber liquid has a high removal rate.

The present invention discloses a low-power metal soft magnetic composite material and a preparation method thereof. The main components of the material are Si and Fe, and the preparation process is ingot casting, coating diffusion, crushing and screening, pressing and forming, and annealing. The advantage is that by coating and diffusing a low-melting point, high-resistivity, and easily oxidizable substance to the FeSi alloy grain boundary, not only the overall resistivity of the material is improved, but also the coating layer is evenly and stably coated on the surface of the grain, tightly combined, not easy to fall off, and can effectively avoid the problem of the insulating layer easily falling off and decomposing and failing in the subsequent pressing and annealing process. Finally, a low-power metal soft magnetic composite material is obtained by this method.

The invention provides an anti-offset magnetic coupling mechanism for a wireless charging system of an unmanned aerial vehicle, the magnetic coupling mechanism comprises a transmitting end arranged on a landing platform and a receiving end mounted on the unmanned aerial vehicle, and a transmitting coil is a double-layer circular coil wound at gradient intervals; an axial magnetic field which is uniformly distributed is formed through a non-uniform distribution structure of coil turn spacing; the receiving end is composed of four sets of same magnetic core-coil structures, each set is composed of a lightweight cylindrical novel soft magnetic composite material magnetic core and an externally-wound solenoid coil of a vertical landing gear of the unmanned aerial vehicle, the magnetic cores are located in the vertical landing gear of the unmanned aerial vehicle, and the coils of the four magnetic core-coil structures are closely wound in the axial direction of the outer surface of the landing gear and connected in series. And coil and magnetic core parameters are designed by using an evolutionary algorithm. The problems that in a traditional scheme, the anti-offset capacity is weak, the magnetic core weight is large, and the receiving end is not matched with the special-shaped structure of the unmanned aerial vehicle are solved, and the method is suitable for unmanned aerial vehicle wireless charging scenes.

The present invention discloses a magnetic nanocomposite material, a preparation method thereof, and an application thereof in the enrichment of low-abundance proteins. The magnetic nanocomposite material proposed by the present invention is Fe3O4@TS-1. Its preparation method is simple to operate. The sol-gel hydrothermal method is adopted, and the preparation is stable. The magnetic composite material Fe3O4@TS-1 is successfully synthesized. While ensuring the material properties of the TS-1 molecular sieve material, this material not only guarantees excellent protein adsorption performance but also endows it with magnetism, providing a simpler, faster, and more efficient technical method for large-scale sample processing. The enrichment of low-abundance proteins based on the magnetic nanocomposite material proposed by the present invention can be applied to almost all sample types, effectively solving the interference caused by high-abundance proteins to the identification of low-abundance proteins during mass spectrometry detection, and the number of protein identifications can be increased by 100% - 700%.

The invention belongs to the technical field of insulation treatment of magnetic materials, and provides a preparation method of an oxidation-resistant high-resistivity soft magnetic composite material, which comprises the following steps: mixing an antioxidant metal organic framework (Cu-MOFs) with nano oxide and resin according to a certain proportion, and treating iron-based alloy powder. On one hand, the Cu-MOFs material is adsorbed on the surface of the magnetic powder to form a compact protective film to inhibit oxidation of a metal matrix, and on the other hand, the Cu-MOFs material has good compatibility with resin and is uniformly dispersed in a coating system, so that the permeation path of an oxidizing medium is effectively reduced, and the service life of the coating is prolonged. And rich functional groups of the Cu-MOFs material can change the surface characteristics of the nano oxide, the agglomeration effect of the nano oxide is reduced, the resistivity of the magnetic powder core is improved, and meanwhile the problem that the iron-based alloy magnetic powder core is oxidized and rusted in a special environment is effectively solved.

The invention provides a soft magnetic composite material and a preparation method thereof. The soft magnetic composite material is composed of amorphous nanocrystalline coated powder and iron-based alloy coated powder. Wherein the amorphous nanocrystalline coated powder comprises an amorphous nanocrystalline core and a first insulating coating layer group, and the iron-based alloy coated powder comprises an iron-based core and a second insulating coating layer group; the first insulating coating layer group and the second insulating coating layer group respectively and independently comprise a phosphate coating, a silicon oxide layer and a sodium silicate layer which are stacked, and the phosphate coating is arranged on the surface of the inner core. The surface of the alloy powder in the soft magnetic composite material is sequentially coated with the phosphate coating, the silicon oxide layer and the sodium silicate layer, mutual insulation between powder particles is achieved, eddy current generated between the particles under high frequency is effectively reduced, then eddy current loss is reduced, the overall performance of a power device is improved, and large-scale application and popularization are facilitated.

The invention discloses a preparation method of a wear-resistant magnetic composite nano ferroferric oxide material, and belongs to the technical field of nano ferroferric oxide materials.The preparation method comprises the steps that coated modified ferroferric oxide composite powder, silver nitrate and absolute methanol are added into a reaction kettle, stirring and ultrasonic dispersion are conducted, then 2-aminoterephthalic acid is added, stirring and mixing are conducted, and a mixture is obtained; and after the reaction, separating to obtain the wear-resistant magnetic composite nano ferroferric oxide material. The wear-resistant magnetic composite nano ferroferric oxide material prepared by the preparation method disclosed by the invention overcomes the problem that an existing ferrite material is relatively single in electromagnetic loss mechanism in the aspect of nickel-phosphorus plated fabric, and the electromagnetic shielding effectiveness of the fabric is improved; the coated modified ferroferric oxide composite powder has good dispersity, a polydopamine coating layer on the surface of the coated modified ferroferric oxide composite powder improves the anchoring effect on silver MOF particles through a mussel-like adhesion interface, meanwhile, stress is dispersed and crack propagation is reduced through the buffering effect of the polydopamine coating layer, and the mechanical stability of the wear-resistant magnetic composite nano ferroferric oxide material is improved.

The present invention belongs to the technical field of magnetic materials, and particularly relates to a high-frequency magnetic composite material, a high-frequency magnetic device and a processing method thereof. Among them, the processing method of the high-frequency magnetic composite material includes: mixing magnetic metal particles with a magnetic vortex structure, a solvent and a non-magnetic ceramic phase material and grinding them into a slurry; placing the slurry in a mold and forming it under a low-temperature and low-pressure process; wherein, the conditions of the low-temperature and low-pressure process are that the temperature is lower than 300 °C and the pressure is less than 500 MPa. By using magnetic particles with a magnetic vortex structure, there are no magnetic domain walls in the present invention. At high frequencies, magnetization mainly occurs through magnetization rotation, rather than the traditional domain wall displacement mechanism, which can significantly increase the working frequency of the material to above 100 MHz; in addition, the low-temperature and low-pressure process is adopted to avoid various defects of extreme conditions such as high temperature and high pressure in the traditional process.