750 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.

The invention relates to a high-permeability ultralow-coercive-force soft magnetic stainless steel heat treatment process which comprises the following steps: in a nitrogen atmosphere, firstly heating a hot-rolled wire rod to 900-950 DEG C at a heating rate of 30-50 DEG C / h, preserving heat for 4-6 hours to obtain a fine grain structure of equiaxial recrystallization ferrite, then cooling to room temperature at a cooling rate of less than or equal to 15 DEG C / h to homogenize the ferrite structure, and finally cooling to room temperature at a cooling rate of less than or equal to 15 DEG C / h to obtain the high-permeability ultralow-coercive-force soft magnetic stainless steel. The soft magnetic stainless steel is obtained. The method has the advantages that the maximum magnetic conductivity of the soft magnetic stainless steel is improved, the coercive force of the soft magnetic stainless steel is reduced, and the plasticity index of the soft magnetic stainless steel is improved.

The invention relates to the technical field of microwave ferrite devices, and discloses a double-section microstrip circulator which comprises a magnetic conductive sheet, a ferrite gyromagnet and a resistor, the ferrite gyromagnet and the resistor are arranged on the upper surface of the magnetic conductive sheet, a circuit is additionally arranged on the upper surface of the ferrite gyromagnet, and the circuit is connected with a microstrip filter; the ceramic chip is arranged on the upper surface of the circuit, and samarium cobalt is additionally arranged at the top end of the ceramic chip, according to the two-section microstrip circulator, through the arrangement of a combined structure of the magnetic conductive sheet, the ferrite gyromagnet, the circuit, the microstrip filter, the ceramic chip, the samarium cobalt and the resistor, the isolation degree can be effectively improved, and the requirement of a system for high isolation is met; the microstrip filter in circuit connection can improve the second harmonic characteristic and improve the problem that the second harmonic of a conventional microstrip circulator is poor; the ferrite gyromagnet is used as a gyromagnet material, and is combined with a double-section circuit, so that the characteristic of low emission loss can be realized, and the circulator is small in size, light in weight and relatively high in reliability due to the integral structural design.

The invention discloses an electromagnetic shielding method for a high-density integrated wireless audio module, and the method comprises the steps: employing a metal material with good conductivity and corrosion resistance, such as aluminum alloy and copper alloy, to cover the outer surface of the module, and enabling the outer metal shielding layer to be used for isolating external electromagnetic interference; the thickness of the outer metal shielding layer is generally 0.3 mm to 1 mm, it is ensured that external electromagnetic radiation can be effectively reflected or absorbed, and the outer metal shielding layer is located between the outer metal shielding layer and the inner conductive coating and is made of a material with high-frequency absorption performance, such as a ferrite material, a conductive polymer or a carbon-based material. The thickness of the wave-absorbing layer can be designed according to the electromagnetic characteristics of a working frequency band and is generally 0.5 mm to 2 mm, so that high-frequency noise can be effectively attenuated. By adopting a multi-layer shielding structure and an intelligent heat dissipation design, electromagnetic interference is effectively reduced, miniaturization and light weight of the wireless audio module are maintained, and compared with the prior art in which a large number of expensive shielding materials are needed, the wireless audio module has the advantages that the selection of the shielding materials and the intelligent heat dissipation design are optimized.

The invention relates to the technical field of solid waste recycling and functional building materials, in particular to a wave-absorbing wall material based on a waste glass fiber wind power blade and a preparation method of the wave-absorbing wall material. The wave-absorbing wall material based on the waste glass fiber wind power blade is mainly prepared from the following raw materials in parts by mass: 60-68 parts of waste glass fiber wind power blade granules, 30-35 parts of silicon-aluminum solid wastes, 2-5 parts of a wave-absorbing reinforcing agent and 6-10 parts of water. According to the invention, waste wind power blades and silicon-aluminum solid wastes are used as raw materials, a high-strength porous carbon skeleton structure is formed in the material through a vacuum pugging molding and vacuum sintering process, and meanwhile, a ferrite wave-absorbing reinforcing agent is mixed to form a composite wave-absorbing electromagnetic structure of a carbon aggregate-dielectric loss material and a ferrite particle-magnetic loss material; collaborative optimization of the electromagnetic wave absorption performance and the material mechanical property is achieved, and good ecological value and economic benefits are achieved.

A non-oriented electrical steel sheet having a composition including of the following elements, expressed in percentage by weight: 0.0001%≤Carbon≤0.007%, 0.18%≤Manganese≤0.5%, 3.1%≤Silicon≤3.8%, 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 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 34% when calculated in accordance with Bertotti method and simultaneously having a magnetic polarization at 5000 A / m (J50) from 1.60 T to 1.65 T.

The invention discloses a less-rare-earth permanent magnet motor rotor, which comprises an annular rotor iron core (multiple layers of silicon steel sheets are axially laminated, and the outer diameter is D), and 2N magnetic poles (N is greater than or equal to 1) are uniformly and alternately arranged in the circumferential direction and have opposite polarities. Each magnetic pole comprises a first magnetic steel (the length direction is a q axis, and a d-axis area is separated) radially embedded into the rotor core, and an asymmetric permanent magnet structure positioned in the d-axis area, and the asymmetric permanent magnet structure can be (1) an asymmetric V-shaped structure formed by second and third magnetic steels (the included angle is 120-170 degrees, and the vertex is positioned at the rotating near end); (2) a double-I structure composed of a second magnetic steel and a fourth magnetic steel; and (3) a triangular structure formed by the second, third and fourth magnetic steels. Wherein the second magnetic steel is ferrite magnetic steel and is arranged at the rotating far end of the magnetic pole, the third magnetic steel and the fourth magnetic steel are rare earth magnetic steel and are located at the near end and the d axis, and all the magnetic steel are magnetized in the tangential direction and are isolated by the iron core. According to the structure, the use amount of rare earth is reduced, the torque output of unit rare earth is improved by optimizing a magnetic circuit, and the performance and the cost are both considered.

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.

A Hall current sensor, comprising: a magnetic core (10), wherein an air gap (11) is formed in one side of the magnetic core (10); a Hall element (12), wherein the Hall element (12) is disposed in the air gap (11); and a ferrite structure, wherein the ferrite structure is disposed in the air gap (11), and the ferrite structure clamps the Hall element (12) in the air gap (11), so as to reduce the air gap of a magnetic circuit and keep the Hall element (12) perpendicular to the direction of a magnetic induction line in the air gap (11). The Hall current sensor can significantly improve the detection precision, anti-interference capability and position error resistance capability of open-loop and closed-loop magnetic sensors in leakage current, small current and other weak magnetic scenarios, thereby realizing low-cost, high-precision and fast-response current sensing.

The application provides a high-efficiency recovery method for copper in chalcocite-type copper concentrate sulfuric acid roasting and acid leaching residue, and belongs to the technical field of mineral processing.The application recovers sulfide copper minerals and intergrowth of the sulfide copper minerals and cupric ferrite in chalcocite-type copper concentrate sulfuric acid roasting and acid leaching residue through flotation, then recovers cupric ferrite and intergrowth of the cupric ferrite and the sulfide copper minerals in middlings and tailings in the flotation through magnetic separation, and finally recovers superfine cupric ferrite and copper mineral particles completely wrapped by gangue minerals in the tailings in the magnetic separation through chemical dissociation.The application uses the method of combination of flotation, magnetic separation and chemical dissociation, strengthens recovery of the copper in chalcocite-type copper concentrate sulfuric acid roasting and acid leaching residue, and the comprehensive recovery rate can reach 91.18%.

The invention provides a ferrite material and a preparation method and application thereof, the ferrite material comprises main components and auxiliary components, the main components comprise 25-35 mol% of NiO, 10-20 mol% of MnO, 0-5 mol% of ZnO and 52-60 mol% of Fe2O3, and the auxiliary components comprise Co2O3, CaCO3 and Nb2O5. The ferrite material has low magnetic conductivity and high Bs, the shrinkage rate of the ferrite material is basically consistent with that of a main material, the ferrite material can serve as an air gap material to obtain a magnetic core with segmented air gaps, and the problems that the segmented air gap magnetic core cracks when sintered, the air gap material permeates into the main material, and magnetic leakage occurs are solved.

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 belongs to the technical field of iron oxide preparation, and discloses a method for purifying iron oxide for soft magnetic ferrite from red mud and application of the method. The red mud is subjected to crushing and wet grinding, and red mud slurry is obtained; the red mud slurry is subjected to magnetic separation, drying and grinding into powder, and a magnetic product containing ferric oxide is obtained; the magnetic product is subjected to acid leaching and suction filtration with hydrochloric acid, and first filtrate is obtained; carrying out alkaline leaching treatment on the first filtrate by adopting sodium hydroxide, filtering and drying to obtain a red brown dry material; grinding the red brown dry material into powder, washing with deionized water, carrying out suction filtration, and drying to obtain a first dry material; and grinding the first dry material to a powder state, and carrying out aerobic sintering to obtain the reddish brown solid iron oxide. The iron oxide extracted through the method can replace existing high-purity commercial iron oxide and can be applied to preparation and development of soft magnetic materials, and various properties of the soft magnetic materials are indifferent or even higher.

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 relates to the technical field of microwave ferrite devices, and discloses a miniaturized broadband microstrip circulator based on a double-ferrite nested structure, comprising a substrate, the upper surface of which is provided with a magnetic conductive sheet; a high dielectric ceramic is arranged on the magnetic conductive sheet, and a low magnetic saturation ferrite and a high magnetic saturation ferrite are sequentially nested in an inner cavity of the high dielectric ceramic; a circuit is arranged on the upper surface of the high-dielectric ceramic, and a ceramic piece and a permanent magnet are sequentially installed above the circuit. According to the circulator, a magnetic conductive sheet is additionally arranged, a structure with high dielectric ceramics as a core is constructed, the characteristic difference of two ferrite gyromagnetic materials with different magnetic saturation intensities is utilized, and the frequency resonance characteristic of a center junction is adjusted through nested arrangement, so that gyromagnetic effects under different frequencies are complementary to expand the working frequency band. Meanwhile, the high-dielectric ceramic optimizes port impedance matching and reduces electromagnetic wave reflection by virtue of a high dielectric constant, and cooperates with an internal ferrite nested structure, so that the frequency bandwidth is widened through a composite material mode, and miniaturization and broadband effects are achieved.

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

The disclosure provides designs and methods of fabrication of stacked double junction circulator device that includes two or more ferrite elements. The disclosed stacked double junction circulator device uses a single magnet, instead of two magnets that are conventionally used for the side-by-side double junction circulator. The disclosed stacked double junction circulator device offers significant advantages in regards to installation requirements on the customer side.

The invention discloses a dual three-phase asymmetric stator type dual permanent magnet vernier motor which comprises a stator and a rotor. The stator comprises a stator iron core and stator permanent magnets, the stator iron core is formed by alternately arranging a plurality of umbrella-shaped armature teeth and quasi-rectangular armature teeth in the circumferential direction, and the consequent pole array permanent magnets which are magnetized outwards in the radial direction are pasted to openings in the two sides of each umbrella-shaped armature tooth respectively. A sector-ring-shaped auxiliary groove is formed between the umbrella-shaped armature teeth and the stator permanent magnets, and the auxiliary groove is filled with a non-magnetic-conductive material. The rotor comprises a rotor iron core and a rotor ferrite, the rotor iron core is similar to a gear in shape, the rotor ferrite is embedded in the rotor iron core by adopting a Halbach-based consequent pole array, and the length of the rotor ferrite is larger than the length of the rotor iron core and the length of the stator iron core. According to the invention, the torque density and the permanent magnet utilization rate are improved by using additional working harmonic waves generated by an asymmetric design and a double-permanent-magnet structure and an unequal-length structure.

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 invention provides a ferrite-doped hierarchical pore biochar material with electromagnetic wave absorption performance and a preparation method thereof, and belongs to the technical field of wave-absorbing materials. The method comprises the following steps: crushing coconut shells into powder by a wall breaking machine, cleaning the coconut shells in a potassium hydroxide solution, and then transferring the obtained coconut shells into a cobalt nitrate solution and a ferric nitrate solution for dipping and drying; and finally, transferring the coconut shells impregnated in the cobalt nitrate and ferric nitrate solution into a tubular furnace, and calcining in a carbon dioxide atmosphere to obtain the ferrite-doped hierarchical porous biochar material with the electromagnetic wave absorption performance. The material shows a richer micro-mesoporous structure and larger pore volume and specific surface area compared with other activation methods under calcination activation of metals such as iron and cobalt in a carbon dioxide atmosphere, the micropore volume reaches 0.725 cm < 3 >. G <-1 >, and the mesopore volume reaches 0.695 cm < 3 >. G <-1 >.

A non-oriented electrical steel sheet having a composition of the following elements, expressed in percentage by weight 0.0001%≤Carbon≤0.007%, 0.15%≤Manganese≤0.25%, 2.9%≤Silicon≤3.4%, 0.8%≤Aluminum≤1.1%, Phosphorus≤0.15%, Sulfur≤0.006%, Nitrogen≤0.09%, with 3.85%≤Si+Al+Mn≤5.5%, and the following optional elements 0%≤Niobium≤0.1%, 0%≤Titanium≤0.1%, 0%≤Vanadium≤0.1%, 0%≤Chromium≤1%, 0%≤Molybdenum≤0.5%, 0%≤Tungsten≤0.1%, 0%≤Cobalt≤1%, 0%≤Arsenic≤0.05%, 0.001%≤Calcium≤0.01%, 0%≤Copper≤1%, 0%≤Nickel≤1%, 0%≤Boron≤0.05%, 0%≤Lead≤0.2%, 0%≤Tin≤0.2%, 0%≤Antimony≤0.2%, the remainder composition being composed of iron and unavoidable impurities caused by processing. The microstructure is 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 having a percentage of eddy current losses in total iron losses less than 25% and simultaneously having a magnetic polarization at 5000 A / m from 1.625 T to 1.690 T.

To provide a resin composition that can produce a cured product with improved specific magnetic permeability and magnetic loss.SOLUTION: A resin composition comprising: (A) a Ni-containing iron alloy-based magnetic powder; (B) a Mn-containing ferrite-based magnetic powder; and (C) a thermosetting resin, the component (A) containing an Fe-Ni-Cr-based alloy magnetic powder, the component (B) containing or not containing a Zn-containing ferrite-based magnetic power, and the mass ratio ((Mn+Zn) / Fe) of the total amount of Mn and Zn to an amount of Fe in the entire magnetic powder contained in the component (A) and the component (B) being 0.055 or more and 0.16 or less.SELECTED DRAWING: None