524 results about "Ferrite (magnet)" patented technology

A double cold rolled non-oriented electrical steel sheet having a composition including: 0.0001%≤Carbon≤0.007%, 0.1%≤Manganese≤0.2%, 3.1%≤Silicon≤3.6%, 0.8%≤Aluminum≤1.1%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, and can contain various optional elements. The remainder composition being iron and unavoidable impurities caused by processing, the microstructure is made of ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, is from 35% to 45% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.64 T to 1.66 T.

A double cold rolled non-oriented electrical steel sheet having a composition including, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.15%≤Manganese≤0.3%, 3.2%≤Silicon≤3.8%, 0.8%≤Aluminum≤1.1%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, and can contain various optional elements. The remainder composition being iron and unavoidable impurities caused by processing, the microstructure is made of ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, less than 30% when calculated in accordance of Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.66 T to 1.69 T.

A non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%,, 0.15% ≤Manganese≤0.2%, 3%≤Silicon≤3.6%, 0.7%≤Aluminum≤1.3%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, with 3.85%≤Si+Al+Mn ≤5.5%, and can contain various optional elements, the remainder composition being composed of iron and unavoidable impurities caused by processing, the microstructure of the steel sheet being made of ferrite and including in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, of 35 to 55% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.635T to 1.670T.

A double cold rolled non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.1%≤Manganese≤0.3%, 3.1%≤Silicon≤3.8%, 0.6%≤Aluminum≤0.8%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, and can contain various optional elements. The remainder composition is iron and unavoidable impurities caused by processing. The microstructure ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and having a percentage of eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, of 40 to 50% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.66T to 1.7T.

A non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.15%≤Manganese≤0.2%, 3%≤Silicon≤3.6%, 0.7%≤Aluminum≤1.3%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, with 3.85%≤Si+Al+Mn≤5.5%, various optional elements. The remainder composition is iron and unavoidable impurities caused by processing. The microstructure is made of ferrite and has in area fraction, 80% to 100% recrystallized microstructure, 0% to 20% non-recrystallized microstructure wherein the average grain size of recrystallized microstructure is from 20 microns to 110 microns and eddy current losses in total iron losses, measured at 1 T and 400 Hz according to IEC 60404-2 standards, of 35 to 55% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000A / m (J50) from 1.635T to 1.670T.

The invention provides a high-strength low-loss nickel-zinc-copper ferrite material and a preparation method thereof, Fe2O3, ZnO, NiO and CuO in a specific content range are adopted as main components, Bi2O3, SnO2, SiO2 and CaCO3 in a specific content range are adopted as additive aids, sintering treatment is performed at 900-1100 DEG C, and the nickel-zinc-copper ferrite material with high magnetic conductivity, high strength and low loss characteristics is prepared. And stable work can be realized in a temperature range of-55 DEG C to 200 DEG C.

Provided is a MnZn-based ferrite having excellent characteristics of maximum magnetic flux density (Bm) even in a high-temperature environment. The MnZn ferrite according to one embodiment of the present invention contains Fe2O3, ZnO, and MnO as main components, in 100 mol% of the main components, the content of Fe2O3 is 56.0 to 59.0 mol%, the content of ZnO is 2.5 to 7.0 mol%, and the remainder is MnO, and the MnZn ferrite contains 0.010 to 0.050 mass% of SiO2, 0.020 to 0.060 mass% of CaO, and 0.150 to 0.350 mass% of Co2O3 as auxiliary components relative to 100 mass% of the main components.

The invention relates to the technical field of samarium-iron-nitrogen permanent magnet material manufacturing, and discloses a digital twinning samarium-iron-nitrogen injection molding process parameter optimization method and system. According to the method, dynamic optimization is realized by integrating the digital twin and the physical production line. And collecting and preprocessing production line real-time sensor data. A digital twin comprising a particle layer, a melt layer and a pole layer is constructed and updated based thereon. By using the twin, the aggregation degree and orientation degree of the samarium-iron-nitrogen particles are predicted in a particle layer, the temperature, shear and magnetic flux distribution are simulated in a melt layer, and the magnetic performance index is evaluated in a magnetic pole layer. According to the prediction and evaluation results, the material temperature, the injection speed, the pulse vibration magnetic field waveform and the pressure maintaining curve are optimized through an artificial intelligence agent model. And finally, the optimized parameters are issued to a production line for execution through the programmable logic controller. According to the method, online self-adaptive adjustment of process parameters is achieved, and the magnet forming quality and efficiency are improved.

The invention discloses a low-loss high-frequency transformer based on nanocrystalline alloy, and belongs to the technical field of transformers, the low-loss high-frequency transformer comprises a mounting plate, an n-shaped framework, a columnar magnetic core, a winding and a protective heat dissipation mechanism, the columnar magnetic core is of a three-column type composite structure and is formed by staggering and laminating nanocrystalline thin film layers and ferrite sheet layers, a stepped air gap structure and an insulating isolation layer are arranged on the outer surface; and the winding leading-out end is connected with an external circuit through symmetrically distributed plug connectors. The protective heat dissipation mechanism is composed of an epoxy layer containing boron nitride filler, a heat conduction ring, heat dissipation fins, a heat dissipation fan and a flow guide plate. The advantages of nanocrystalline and ferrite materials are combined, a composite heat dissipation system is matched, the magnetic core loss under the high-frequency working condition is remarkably reduced, temperature rise is effectively controlled, the insulation performance and assembly stability are improved, low-loss, high-efficiency and high-stability operation is achieved, and the requirements of the fields of new energy automobiles, photovoltaic energy storage and the like are met.

The invention discloses a space-time modulation filtering circulator based on a substrate integrated waveguide, which consists of a top metal patch, a dielectric substrate, a bottom metal floor, a large metalized through hole and a small metalized through hole, and comprises a rectangular SIW cavity I, a rectangular SIW cavity II, a rectangular SIW cavity III, a pentagonal SIW cavity I, a pentagonal SIW cavity II, a pentagonal SIW cavity III and a circulator central junction, the rectangular SIW cavities are traditional SIW cavities resonating in a fundamental mode, and the pentagonal SIW cavities are space-time modulation SIW cavities; the pentagonal SIW cavity I, the pentagonal SIW cavity II and the pentagonal SIW cavity III are coupled and cascaded through a circulator central junction; the rectangular SIW cavities I, II and III are cascaded with the pentagonal SIW cavities I, II and III in a magnetic coupling mode; the rectangular SIW cavity I, the rectangular SIW cavity II and the rectangular SIW cavity III are fed by the coplanar waveguide transmission line I, the coplanar waveguide transmission line II and the coplanar waveguide transmission line III; according to the space-time modulation SIW filtering circulator provided by the invention, ferrite materials are not needed, the circulator function is realized by adopting three tuning elements, the design complexity of the space-time modulation circulator is reduced, and the frequency selectivity is improved.

The invention belongs to the technical field of electronic materials, and discloses a high-power and low-loss LiZn microwave ferrite material, the raw materials comprise main materials and a dopant, the main materials comprise Li2CO3, ZnO, MnCO3, CuO, NiO and Fe2O3; the doping agent is prepared from Bi2O3, CaCO3 and Co2O3. The preparation method comprises the following steps: carrying out primary ball milling and pre-sintering on the main material to obtain pre-sintered powder; adding a doping agent into the pre-sintered powder, and carrying out secondary ball milling; adding an organic adhesive into the secondary ball-milled material for granulation, and pressing into a blank; and sintering the blank to obtain the high-power and low-loss LiZn microwave ferrite material. Through a specific formula and a preparation process, uniform components and grain refinement can be ensured, and the microwave ferrite material with high Curie temperature, low ferromagnetic resonance line width, low dielectric loss and high spin wave line width is finally prepared.

The invention discloses a T ferromagnetic annealing performance consistency optimization method based on reinforcement learning, and the method comprises the steps: collecting the annealing temperature, heat preservation time, magnetic field intensity, cooling rate and other key process parameters in real time through an industrial Internet of Things, and improving the data quality through normalization and multi-stage data cleaning processing; intelligent evaluation and label classification of the process state are realized by using a multi-layer neural network; a dynamic reward function weight is introduced in combination with a process state label, and a deep Q network reinforcement learning model is driven to perform strategy optimization; the method supports self-adaptive model updating of periodic data acquisition and strategy rapid switching under significant change of a process state, realizes intelligent cooperative closed-loop control of multiple parameters in the annealing process, and improves the operation stability of the annealing process and the consistency of material performance.

The application relates to a nickel-zinc-copper ferrite and a preparation method and application thereof, the nickel-zinc-copper ferrite comprising main components and auxiliary components; the main components comprise Fe2O3 64-66.7 mol%, NiO 9-12 mol%, ZnO 13.5-19 mol% and CuO 3-9.5 mol% with the total mole percentage being 100 mol%; the auxiliary components comprise Bi2O3 0.3-1.5 wt%, Co2O3 0.1-0.6 wt%, CaCO3 0.03-0.08 wt% and ZrO2 less than or equal to 0.1 wt% with the total mass percentage of the main components being taken as a standard. The content of Fe2O3, ZnO, NiO and CuO is controlled, the content of the auxiliary components is matched and adjusted, the prepared nickel-zinc-copper ferrite has high saturation magnetic induction intensity, high magnetic permeability, high Curie temperature, low residual magnetic induction intensity and low specific temperature coefficient, and can be better applied to power inductance or common-mode inductance.

The invention discloses an anti-electromagnetic interference type unmanned aerial vehicle defense matrix, which relates to the field of electromagnetism, and comprises a multi-node defense unit array which is distributed to form a three-dimensional defense network; each node defense unit is coated with the electromagnetic shielding layer, and the electromagnetic shielding layer is made of a conductive composite material; the anti-interference communication module adopts a frequency hopping spread spectrum technology and an encrypted channel; the main control system is used for dynamically distributing defense resources and monitoring electromagnetic interference intensity in real time; and the energy module provides redundant power supply for each unit. Multilayer electromagnetic shielding effectiveness is achieved, the full-band electromagnetic shielding effectiveness is larger than or equal to 50 dB through the composite structure of the metal nanofiber layer and the ferrite wave-absorbing material, the protection capacity is improved by 150% compared with that of a traditional aluminum alloy shell, and it is ensured that the system stably operates in the strong electromagnetic interference environment.

The invention discloses a multi-band high-stability ferrite magnetic material composite formula and a preparation process, and relates to the technical field of magnetic materials. The ferrite magnetic material composite formula comprises 38-42 parts of ferric oxide powder, 37-41 parts of ferroferric oxide powder, 6-12 parts of graphene nanosheets, 5-7 parts of hydroxypropyl methyl cellulose, 6-9 parts of lanthanum oxide, 4-6 parts of scandium oxide, 1-3 parts of nano titanium dioxide, 4-6 parts of bismuth magnesium boron, 9-13 parts of ferric sulfate, 3-5 parts of manganese sulfate, 4-6 parts of zinc sulfate, 2-4 parts of copper sulfate and 2-3 parts of samarium sulfate. By utilizing a physical vapor deposition gradient doping process, the problems that an existing ferrite magnetic material is single in electromagnetic performance, cannot stably and efficiently work in a multi-frequency-band complex electromagnetic environment and cannot meet the requirements of the fields of communication, radar, electronic countermeasure and the like for wide-frequency-band and high-performance magnetic materials can be solved.

A composite electromagnetic wave-absorbing material and preparation method therefor are provided. The composite electromagnetic wave-absorbing material includes following raw materials: magnetite powder, nickel powder, copper powder, samarium oxide, gadolinium oxide, cerium oxide, carbon black powder, graphite powder, epoxy resin, barium titanate powder, antioxidant, curing agent, diluent and leveling agent. Ferrite wave-absorbing materials are used as matrixes to be compounded with nickel powder, copper powder, graphite powder, carbon black and barium titanate, and doped with mixed rare earth oxides through combination of samarium oxide, gadolinium oxide and cerium oxide to thereby obtain the composite electromagnetic wave-absorbing material which combines magnetic loss characteristics of magnetite powder, ferromagnetic behavior of nickel powder and conductivity of copper powder, helping to achieve good electromagnetic wave-absorbing performance. By introducing graphite powder, carbon black powder and barium titanate powder as fillers and doping rare earth, wave-absorbing characteristics of the composite electromagnetic wave-absorbing material are improved.

The application provides a tangential motor, a compressor and an air conditioner, wherein the tangential motor comprises a rotor assembly, the rotor assembly comprises a rotor core, a magnetic steel slot is arranged in each magnetic pole of the rotor core, a rare earth permanent magnet and a ferrite permanent magnet are arranged in the magnetic steel slot, the rare earth permanent magnet is rectangular, the rare earth permanent magnet is quadrilateral, the ferrite permanent magnet has a radial inner side adjacent to an axial hole, the rare earth permanent magnet is located at a radial outer side of the ferrite permanent magnet and is connected with the radial outer side in contact, and the rare earth permanent magnet and the ferrite permanent magnet are both symmetrical about the center line of the corresponding magnetic steel slot. According to the application, the cost caused by the single use of the rare earth permanent magnet is effectively prevented, the insufficient performance of the motor caused by the single use of the ferrite permanent magnet is effectively prevented, and the tangential motor of the application has relatively low manufacturing cost while ensuring relatively high performance of the motor.

The invention belongs to the technical field of magnetic material preparation, and particularly relates to a production process of high-performance rare earth permanent magnetic ferrite magnetic powder. The process comprises the following steps: preparing iron oxide red and auxiliary materials, wherein the auxiliary materials comprise calcium carbonate, strontium carbonate, lanthanum oxide and cobalt oxide; mixing the raw materials in proportion, and then carrying out dry ball-milling densification to obtain a mixed material; the obtained mixture is subjected to steam treatment, the water content of the mixture reaches 2%-5%, then curing is conducted, the curing time is at least 30 min, and the curing process is completed in the auger transfer process; pelletizing is performed; pre-sintering is performed; and coarsely crushing and sieving the pre-sintered material to obtain the rare earth permanent magnetic ferrite magnetic powder. Through steam pretreatment and curing, the strength and thermal stability of the ball material are remarkably improved, the ball material is kept complete and good in fluidity in the kiln, and the consistency and the qualified rate of products are improved.

The utility model provides a crushing and feeding device for permanent magnetic ferrite raw materials, and belongs to the field of permanent magnets. A discharging barrel is arranged at the upper end of the supporting rack, a vibration disc is arranged at the lower end of the supporting rack, a discharging space is formed in the vibration disc, a plurality of preliminary powder suction pipes are arranged on the side edge of the discharging space, a discharging device is connected to an outlet of the vibration disc, a material conveying channel is formed in the discharging device, and a powder removing structure is arranged in the material conveying channel. The dust removal device has the advantages that when materials vibrate on the vibration disc, dust in a material pile can be scattered in the air along with vibration, part of the dust is sucked through suction of the preliminary dust suction pipe, and when the materials pass through the interior of the material conveying channel, the remaining dust is further sucked and discharged through the dust removal structure.

The application relates to a preparation method of a high-dielectric high-Curie-temperature garnet ferrite without rare earth, which comprises the following steps: pre-treating raw materials to make the raw materials with different particle sizes basically reach the same particle size state, and then obtaining mixed materials with uniform components through mechanical stirring and one-time granulation, so that ideal pre-sintering effect can be realized. Meanwhile, three kinds of second grinding materials with different pre-sintering temperatures and particle sizes are uniformly mixed to control the sintering activity of the powder, and the sintering process is matched, so that the microstructure of the sintered body can be finally improved, the porosity of the ferrite material is reduced, and the ferromagnetic resonance line width is reduced. Through the combined substitution of bismuth, zirconium and calcium elements and the adjustment of the preparation process, the particle size of the powder is adjusted, the sintering stage is controlled to the end of continuous grain growth, the microstructure of the garnet ferrite material is improved, and finally the ferrite material with high dielectric constant, high saturation magnetization, low ferromagnetic resonance line width and high Curie temperature is prepared.

The invention discloses a permanent magnetic ferrite process method for improving magnetic performance through secondary addition and a material, and belongs to the technical field of magnetic material processes. The invention aims to solve the problems of mutual interference and single performance of additives in the traditional single-step adding process. Basic additives (CaCO3, SiO2 and the like) are added for the first time to construct a sintering framework, functional additives (Na2CO3, MoO3, ZrO2, Nb2O5 and the like) are added for the second time, and the product is prepared through wet ball milling, forming and sintering. The preparation method is characterized in that Na2CO3 and MoO3 generate a Na2MoO4 composite phase in the process, the Na2MoO4 composite phase has the functions of liquid phase sintering promotion and grain boundary modification, and ZrO2 and Nb2O5 are compounded and doped, so that collaborative optimization of multiple properties is realized. The process does not need to add equipment, is suitable for industrial production, is suitable for high-end motors, electronic equipment and other scenes, and has remarkable practical value and popularization prospect.

The utility model discloses a permanent magnetic ferrite magnetic shoe upper die water absorption plate which comprises an upper end face, a bottom face and a water outlet, the bottom face is an arc face, the upper end face is provided with a slope face with the two sides facing inwards, a U-shaped water groove is formed in the lowest point of the slope face and communicated with the water outlet, and vertical water absorption holes are evenly formed between the upper end face and the bottom face. A water return cavity is formed in the lower end of the vertical water suction hole, the vertical water suction hole is communicated with a water suction hole, the communication position of the water suction hole is higher than the bottom of the water return cavity, horizontal water grooves are formed in the two sides of the upper end face, and the horizontal water grooves are communicated with the vertical water suction hole close to the chamfer of the magnetic shoe. When a part of water still existing in the horizontal drainage cavity or the vertical drainage hole flows back, the water flows into the water return cavity and does not flow out of the water absorption plate, so that the water return phenomenon is avoided, and the phenomenon that the water drops on a green body to cause invisible cracks during product sintering is prevented.

The utility model discloses an integrated self-adaptive clamping special-shaped ferrite permanent magnet element flexible grinding device, which relates to the technical field of ferrite permanent magnet element processing and comprises a base, guide rails are fixedly mounted on two sides of the top of the base, symmetrically distributed sliding seats are arranged on two sides of the top of the base, and the sliding seats are slidably connected onto the guide rails; a locking mechanism is arranged on one side of the sliding seat and is at least used for locking the sliding seat on the guide rail; and a liftable mounting table is arranged above the sliding seat, positioning assemblies are arranged on the two sides of the top of the sliding seat, and the positioning assemblies are at least used for locking when the mounting table ascends and descends. According to the special-shaped ferrite permanent magnet element grinding clamp, the two symmetrically distributed flexible clamping claws and the needle head are used for fixing and clamping the special-shaped ferrite permanent magnet element, so that grinding machining of the special-shaped ferrite permanent magnet element is achieved, and the special-shaped ferrite permanent magnet element grinding clamp can be used for clamping and fixing various different special-shaped ferrite permanent magnet elements; and the price cost of the special-shaped ferrite permanent magnet element is reduced.

The application discloses a feeding device and method for ferrite injection molding magnetic material, and relates to the technical field of feeding devices, which comprises a mounting frame, the top of the mounting frame is provided with a flow increasing element on the inner side of a hopper, the top of a triangular connecting plate is provided with a plurality of knock material units, and the inner side of a discharging pipe is provided with a flow circulation breaker connected with the triangular connecting plate. The multiple knock material units are arranged, the triangular connecting plate is moved up and down through a rectangular guide rod, the triangular connecting plate drives a straight gear to rotate, the bottom of a knocking rod impacts the top of the hopper, the hopper is vibrated, powder is prevented from adhering to the inner wall of the hopper, the flowability of the powder in the hopper is improved, the cleanliness of the inner wall of the hopper is improved, the knocking rod knocks the top of the hopper at different positions through the rotation of the hopper, and the vibration amplitudes of the powder at different positions in the hopper are equal.

The invention discloses an ANSYS simulation-based single-side glued ferrite inductor optimization method, which belongs to the technical field of ferrite inductors, and specifically comprises the following steps of: establishing a simulation model; performing magnetic field simulation analysis, and adjusting the thickness of a magnetic core or the number of turns of a coil to obtain inductance value deviation meeting requirements; performing temperature field simulation analysis, and adjusting the heat conductivity coefficient of the insulating rubber layer or adjusting the surface flatness of the magnetic core to meet the requirement that the highest temperature does not exceed 85 DEG C; and iteratively optimizing the magnetic core parameter of the inductor until the inductance value deviation is less than or equal to + / -5% and the highest working temperature is less than or equal to 85 DEG C, and finally outputting the optimal design parameter. According to the optimization method disclosed by the invention, the inductance value deviation and the working temperature of the single-sided gluing ferrite inductor can accurately meet the requirements, the requirements of a high-precision electronic circuit are met, the design is accurate, the gluing cost and the assembly difficulty are also reduced, and the problems that the double-sided gluing cost of the existing ferrite inductor is high, the assembly is complicated and the design lacks accurate simulation are effectively solved.

The present application belongs to the technical field of sinter production, and particularly relates to a production method of ultra-high basicity sinter for improving converter slagging, dephosphorization and reducing in-furnace spattering, which comprises the following steps: mixing 65% limonite powder, 20% magnetite powder and 15% blast furnace return fines, proportionally mixing 64% sintered mixture, 30% flux, 6% coke powder and 10% sintered internal return to prepare sintered mixed material, mixing and granulating under mist water according to a ratio of 7:3, and sintering under the condition that the thickness of the material layer is controlled to be 850 mm. The composition of the obtained ultra-high basicity sinter is as follows: CaO: 20% to 25%; SiO2: 5.5% to 6.6%; TFe: greater than or equal to 45%; basicity: 3.2 to 3.5; and drum strength: greater than or equal to 68. The micro-phase composition of the ultra-high basicity sinter is as follows: calcium ferrite: greater than or equal to 35%; dicalcium ferrite: 15% to 20%; dicalcium silicate: 10% to 20%; and iron oxide: less than or equal to 25%.

The invention relates to an electrical energy receiving element (202) configured to receive electrical energy in the form of a magnetic field from an electrical energy emitting element, comprising a coil (208), a ferromagnetic element (210) and spacing means (230) for said coil (208) and said ferromagnetic element (210) made of electrically non-conductive and non-magnetic material and configured to maintain a predefined spacing between said coil (208) and said ferromagnetic element (210).These spacing methods allow the magnetic flux received by the coil to be constrained by the ferromagnetic element, thereby reducing the number of ferrite units constituting the ferromagnetic element and thus lightening the electrical energy receiving element. Figure 3.

The application belongs to the technical field of ferrite material preparation, and particularly provides a modified self-biased hexagonal gyromagnetic ferrite material and a preparation method thereof. The modified self-biased hexagonal gyromagnetic ferrite material comprises a main component and an additive. The main component comprises 74.5 mol% to 82.8 mol% of Fe2O3, 1.3 mol% to 6.1 mol% of Cr2O3, and the rest of BaCO3. Taking the weight of the main component after pre-sintering as a calculation basis, the additive comprises 0.5 wt% to 2.0 wt% of CaCO3, 0.5 wt% to 2.0 wt% of SiO2, and 0.1 wt% to 2.0 wt% of Bi2O3. The modified self-biased hexagonal gyromagnetic ferrite material (BaM) prepared through a sintering process optimization has the characteristics of high saturation magnetization (4πM s : 3.9~4.2kGs), high remanence ratio (M r / M s : 0.6~0.8), coercivity (H c : 450~550Oe), and low ferromagnetic resonance line width (ΔH: 230~280Oe), and meets the engineering requirements of microwave devices.

The invention provides a method for detecting the residual magnetic quantity of a permanent magnetic ferrite magnetic shoe. The method comprises the following steps: carrying out surface cleaning treatment on a permanent magnetic ferrite magnetic shoe to be detected; measuring the volume of the magnetic tile; peelable soft magnetic auxiliary layers are uniformly coated on the inner cambered surface, the outer cambered surface and the bottoms and the side walls of the grooves at the two ends of the magnetic tile, the relative permeability of the soft magnetic auxiliary layers is 10-100 times that of the magnetic tile body, and the spraying thickness is 0.2-0.6 mm; after the soft magnetic auxiliary layer is naturally aired, performing constant-temperature treatment on the magnetic tile; the magnetic shoe is placed in the center of a magnetizing coil, saturation magnetizing is carried out, and the magnetizing direction is consistent with the thickness direction of the magnetic shoe; stripping the soft magnetic auxiliary layer after magnetizing; a Helmholtz coil method is adopted to measure the magnetic flux of the magnetic shoe, and volume data is combined to convert the residual magnetic quantity.

The present invention provides a sintered body having a high Curie point and exhibiting high magnetic permeability in a high frequency region. The sintered body comprises a spinel-type ferrite oxide having a main component of a metal element being Fe, Ni, Cu, and Zn, and further comprises Zr, Mn, Al, Co, and Cr, and when the molar fractions of Zn, Ni, Cu, Zr, Mn, Al, Co, and Cr, with Fe being 100 mol, are respectively set as a, b, c, d, e, f, g, and h, 100-a-b-c+2d+(1 / 2)e, a+b+c+d+e / 2, f, g, and h respectively satisfy the following formulas (1) to (5). 49.0 < 100-a-b-c+2d+(1 / 2)e < 50.0 (1) 50.2 < a+b+c+d+e / 2 < 52.7 (2) 0.0012 ≤ f ≤ 0.010 (3) 0.0005 ≤ g ≤ 0.0015 (4) 0.0005 ≤ h ≤ 0.004 (5).