613 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.

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.

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 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.

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 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 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 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 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.

The utility model discloses a diatomite magnetic core flocculation wastewater treatment device in the technical field of wastewater treatment, which comprises a mixed flocculation reaction tank, an electromagnetic sedimentation tank and a transition tank, the top of the mixed flocculation reaction tank is provided with a water adding pipe penetrating through the top of the treatment tank, and the top of the mixed flocculation reaction tank is provided with a dosing stirring mechanism; a water passing hole and a communicating hole are formed in the two groups of partition plates respectively, the mixed flocculation reaction tank is communicated with the electromagnetic sedimentation tank through the water passing hole, the electromagnetic sedimentation tank is communicated with the transition tank through the communicating hole, and an electromagnetic circulation attraction structure and an electromagnet are mounted at the top of an inner cavity of the electromagnetic sedimentation tank through a bracket; according to the utility model, chemicals are added while the chemicals are stirred by the chemical adding and stirring mechanism, and a magnetic composite flocculant containing diatomite is dispersed and guided into the mixed flocculation reaction tank through the stirring shaft and the stirring side pipe, so that the magnetic composite flocculant containing diatomite is dispersed more uniformly and has a larger range, the mixing efficiency is improved, and the mixing effect is improved. And the processing efficiency is improved.

The invention discloses an inductor based on low-voltage plastic package forming and a preparation method thereof, and relates to the technical field of metal soft magnetic composite material preparation. The method comprises the following steps: preparing iron-based alloy magnetic powder by adopting a gas atomization method; the prepared iron-based alloy magnetic powder is subjected to double-layer coating, and iron-based alloy coated powder particles are obtained; sintering to prepare a magnetic core, and winding the magnetic core; and putting the iron-based alloy coated powder particles into the wound magnetic core, and carrying out low-pressure plastic package molding to obtain the prepared inductor. According to the manufacturing method, the integrally-formed inductor is obtained through the low-voltage plastic packaging forming technology, the manufactured inductor has good comprehensive electromagnetic performance and high reliability, and the requirement for the miniaturization and modularization development direction of inductance devices can be met.

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 discloses a preparation method of a composite magnetic powder core of iron-nickel doped carbonyl iron powder, and belongs to the technical field of metal soft magnetic composite magnetic powder cores, the preparation method comprises the following steps: preparing spherical iron-nickel magnetic powder through a gas atomization method; processing the spherical iron-nickel magnetic powder by using a coupling agent to obtain modified spherical iron-nickel magnetic powder; and adding the modified spherical iron-nickel magnetic powder, carbonyl iron powder, kaolin, a binder and a release agent into a V-shaped stirrer, uniformly mixing to obtain mixed magnetic powder, pressing the mixed magnetic powder into a magnetic ring, performing annealing treatment in a nitrogen atmosphere, and performing furnace cooling to room temperature. According to the method, the high-sphericity-degree iron-nickel magnetic powder is firstly produced through a gas atomization method, then large pores among iron-nickel particles are filled with small carbonyl iron particles, and finally the magnetic core density is improved, so that the relative permeability and the direct-current bias performance of a composite magnetic powder core sample are improved; in addition, due to the fact that the nickel metal raw material is high in cost, the raw material cost for preparing the iron-nickel composite magnetic powder core is reduced through doping of the carbonyl iron powder.

The present invention provides an iron-based nanocrystalline soft magnetic alloy powder, a soft magnetic composite material and a preparation method thereof, belonging to the technical field of soft magnetic materials. The iron-based nanocrystalline soft magnetic alloy powder has a heterogeneous nanocrystalline structure comprising a three-dimensional island-shaped amorphous region and a nanocrystalline region. The diameter of the three-dimensional island-shaped amorphous region is 50-100 nm, and the number density of the three-dimensional island-shaped amorphous region is 10 19 ‑10 20 m ‑3 The iron-based nanocrystalline soft magnetic alloy powder has the advantages of high sphericity, high saturation magnetization and low coercive force; the soft magnetic composite material comprises soft magnetic powder and a coating layer coated on the surface of the soft magnetic powder, and the coating layer comprises a binder, wherein the soft magnetic powder is the iron-based nanocrystalline soft magnetic alloy powder provided by the present invention, or is composited with at least one of iron-nickel, iron-nickel-molybdenum, iron-silicon, iron-silicon-aluminum, iron-silicon-chromium, carbonyl iron and pure iron powder, and has the advantages of low high-frequency loss, high magnetic permeability and high DC bias.

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.