931 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.

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 relates to the technical field of magnetic materials, in particular to a ferrite neodymium iron boron composite magnetic material and a preparation method thereof. The ferrite neodymium iron boron composite magnetic material comprises the following raw materials in parts by weight: 20-30 parts of ferrite magnetic powder, 40-50 parts of neodymium iron boron magnetic powder, 5-10 parts of silicon dioxide, 2-5 parts of carbon nanotubes, 0.5-1 part of polyethylene and 0.5-2 parts of polyimide. The high-temperature-resistant and corrosion-resistant permanent magnet has high magnet performance and also has high-temperature-resistant performance and corrosion-resistant performance.

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 discloses an intelligent hanging and conveying device for manganese zinc ferrite core vibration grinding materials, and relates to the technical field of conveying, the intelligent hanging and conveying device comprises a conveying box, a hanging frame is fixedly installed on the surface of the conveying box, a feeding pipe is fixedly installed on the surface of the conveying box, a discharging port is fixedly installed on the surface of the conveying box, and a motor is fixedly installed on the outer wall of the conveying box; a transmission belt is installed on the surface of the transmission roller in a transmission mode, a material supporting plate is fixedly installed on the surface of the transmission belt, a sliding groove is formed in the top of the material supporting plate, a sliding block is slidably installed on the inner wall of the sliding groove, a push plate is fixedly installed on the top of the sliding block, and a guide groove is formed in the surface of the material conveying box; the elastic telescopic rod moves upwards to drive the rotating wheel to move upwards, the rotating wheel is pushed to enter the guide groove under the elasticity of the elastic telescopic rod in the upward moving process, and the rotating wheel moves in the direction of the guide groove.

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.

The invention relates to a large-size double-layer splicing type ferrite magnetic shielding structure, in particular to a low-noise magnetic shielding barrel structure which is particularly suitable for an ultra-high sensitive magnetic field and inertial measurement device and miniaturization integration application of the ultra-high sensitive magnetic field and inertial measurement device. The magnetic shielding barrel is manufactured by splicing single large-size ferrite blocks into a double-layer cylinder. And the seam at the splicing part of the inner layer is blocked by the ferrite on the outer layer, so that the splicing does not generate large magnetic flux leakage. The double-layer configuration improves the shielding coefficient and reduces the magnetic noise at the same time. The novel large-size double-layer splicing type ferrite magnetic shielding structure shielding barrel is simple in processing technology, the shielding effect is not affected while the material cost is saved, the magnetic noise is reduced through the double-layer barrel structure, and the defect that the magnetic noise caused by a traditional single-layer ferrite magnetic shielding barrel cannot be further reduced is overcome.

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 invention provides NiCuZn ferrite with high magnetic conductivity and a preparation method thereof. The preparation method comprises the following steps: (1) carrying out primary ball milling on raw materials of the NiCuZn ferrite, and pre-sintering to obtain a pre-sintered material; and (2) the pre-sintered material and a doping agent are subjected to secondary ball milling, and after granulation, molding and sintering, the NiCuZn ferrite is obtained, and the doping agent comprises WO3 and TiO2. Through combined doping of WO3 and TiO2, the sample density can be improved, the magnetic conductivity, the Curie temperature and the saturation flux density can be improved, meanwhile, the magnetic loss is reduced, and the final ferrite can be suitable for electronic elements with high requirements for the magnetic conductivity.

The invention relates to the technical field of ferrite magnetic steel production and preparation, in particular to a preparation device and a preparation method of tough high-performance ferrite magnetic steel, the preparation device comprises a plate frame, and the top of the plate frame is provided with a fragmentation mechanism. The invention provides a preparation device of tough high-performance ferrite magnetic steel, which has a multi-stage crushing function, accurately controls coarse crushing to fine crushing, ensures that the granularity of raw materials is uniform and fine, provides a stable raw material basis for subsequent procedures, deeply removes iron, reduces the content of iron impurities to be extremely low, ensures high purity and excellent electromagnetic performance of the magnetic steel, and is suitable for industrial production. An efficient and powerful stirring and mixing structure is arranged, the mixing efficiency and uniformity of raw materials and additives are promoted to be greatly improved, preheating and vibrating functions are integrated, the materials are heated through intelligent temperature control, and therefore the viscosity is reduced, the fluidity is improved, pre-pressing forming is assisted, and due to the vibrating function, agglomerates are scattered when the materials are conveyed, and the component uniformity is optimized; the omnibearing assistance magnetic steel achieves the advantages of toughness and high performance standard.

The invention discloses a hybrid excitation electric roller direct drive motor, and relates to the technical field of motors, the hybrid excitation electric roller direct drive motor comprises a shell, a shaft is rotatably connected to the center of the shell, and a stator iron core is rotatably connected to the outer wall of the shaft. On one hand, the magnetic resistance torque is fully utilized and the use amount of the permanent magnet is reduced by utilizing the characteristics of the magnetism-assisting synchronous magnetic resistance structure, and on the other hand, ferrite without rare earth and neodymium iron boron containing rare earth are mixed for use by adopting a magnetic mixing technology, so that the use amount of the rare earth permanent magnet can be further reduced, and the use amount of the rare earth permanent magnet can be reduced by about half under the same performance index; and secondly, through reasonable arrangement of the permanent magnets and adjustment of the distribution of the magnetic field, the magnetic circuit design is more optimized, the magnetic field is accurately controlled, and the demagnetization resistance of the ferrite in a reverse magnetic field can be improved.

An iron core structure having reduced rare earth permanent magnet material consumption, which is improved on the basis of an embedded single V magnetic steel arrangement topological structure. The iron core structure comprises magnetic bridges and magnetic steels, and the magnetic bridges can be classified into single-magnetic-bridge and double-magnetic-bridge structures. The iron core structure enables low-cost and small-proportion permanent magnet materials such as a neodymium-iron-boron permanent magnet material, a permanent magnetic ferrite or a samarium-iron-nitrogen permanent magnet to be perfectly matched in different parts of a motor magnetic circuit, so as to give full play to respective advantages. The magnetic bridges are pre-saturated, and the magnetic steel of a main magnetic circuit generates 100% of main magnetic flux, so that the consumption of the magnetic steel material of the main magnetic circuit is reduced, the cost of a motor is further reduced while the power density of the motor is improved, and precious rare earth resources are saved.

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.

The invention relates to the technical field of insect situation forecasting lamps, in particular to a manufacturing method for improving the strength of a permanent magnetic ferrite wet-pressing magnetic shoe. Comprising the following production steps: 1, weighing iron oxide red with proper granularity, strontium carbonate with proper granularity and an additive, uniformly mixing, and pre-sintering to obtain pre-sintered material magnetic powder; 2, putting the pre-sintered material magnetic powder and a sintering aid into a ball mill, and performing micro-crushing by taking water as a medium; 3, the water content of the micro-crushed slurry is adjusted, the slurry is placed in a magnetic field to be formed, and a magnetic shoe pressed blank is obtained; and 4, sintering the magnetic tile pressed blank in a kiln to obtain a sintered magnetic tile semi-finished product. And 5, grinding the sintered magnetic shoe semi-finished product. According to the method, iron oxide red with the particle size larger than or equal to 1.5 micrometers is adopted for producing the ferrite pre-sintering material, meanwhile, the fine grinding particle size of slurry before wet pressing forming is controlled to be larger than 0.8 micrometer, and then the mechanical strength of the wet pressing magnetic shoe obtained through forming and sintering is obviously improved.

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 discloses a preparation method of a multi-strand stranded cable PPS polymer material, and belongs to the field of cable insulation protection.The method comprises the steps that polyphenylene sulfide and ferrite magnetic powder are weighed and mixed to obtain a first mixed material, and the proportion of the polyphenylene sulfide and the ferrite magnetic powder meets the magnetic powder volume ratio # imgabs0 # = 65%-70%; adding branched polyethylene into the first mixed material, and synchronously adding a polar graft and a composite lubricant to prepare a second mixed material; placing the second mixed material in a high-speed mixer, setting the rotating speed to be 800-1200 rpm, and mixing for 10-15 min to obtain a first mixed material; and putting the first mixture into a double-screw extruder, and finally melting and shearing to obtain the polyphenylene sulfide. The polyphenylene sulfide disclosed by the invention has excellent chemical stability, oxidation resistance and heat resistance.

The invention discloses a preparation process of a high-performance high-resistance seven-series permanent magnetic ferrite and a product prepared by the preparation process, and belongs to the technical field of permanent magnetic ferrites. The method comprises the following steps: stirring and mixing a nine-series pre-sintered material and high-resistance iron red in proportion, pre-oxidizing after mixing to form a permanent magnetic ferrite pre-sintered material, and then crushing the pre-sintered material; and mixing the pre-sintered material obtained in the step a with auxiliary materials in proportion, ball-milling, and carrying out secondary sintering to obtain the high-resistance seven-series permanent magnetic ferrite, so that the resistance of the permanent magnetic ferrite can be effectively improved.

The invention relates to the technical field of magnetic core production, and discloses burr cleaning equipment for soft magnetic ferrite magnetic core green bodies, which comprises a polishing box, a rotating plate is rotatably mounted in the polishing box, a plurality of opening mechanisms are arranged on the front surface of the rotating plate, and each opening mechanism comprises a movable circular plate arranged on the front surface of the rotating plate; a first grinding block is fixedly installed on the front face of the movable circular plate, a cylinder is fixedly installed on the front face of the movable circular plate, a telescopic push rod is slidably installed in the cylinder, the front end of the telescopic push rod extends out of the cylinder, and two air conveying cylinders are fixedly installed on the outer wall of the cylinder. And air conveying rods are slidably mounted in the two air conveying cylinders correspondingly, and the two air conveying rods are sleeved with first reset springs correspondingly. The magnetic core polishing device can polish the surface and the inner wall of a magnetic core in all directions, it is guaranteed that burrs on the magnetic core are polished thoroughly, and use is not affected.

The invention discloses a preparation method of a high-performance high-breakdown-voltage permanent magnetic ferrite, relates to the technical field of preparation of permanent magnetic ferrites, and aims to solve the problem that the breakdown voltage performance cannot meet the requirement when a high-performance ferrite is prepared on the basis of a 9-series strontium ferrite pre-sintering material added with lanthanum and cobalt. The preparation method comprises the following steps: uniformly mixing a lanthanum-cobalt-free 5-series strontium ferrite pre-sintered material, a lanthanum-cobalt-added 9-series strontium ferrite pre-sintered material and a recycled waste material according to a ratio to serve as raw materials, adding auxiliary materials, mixing, putting into a ball milling tank, adding water, carrying out sufficient ball milling, discharging from the tank, filtering water, magnetizing, pressurizing and forming in a pressing machine, heating and sintering a formed blank, and carrying out high-temperature sintering to obtain the lanthanum-cobalt-free strontium ferrite composite material. Grinding and drying to obtain the permanent magnetic ferrite; the process is simple, the breakdown voltage of the high-performance ferrite added with lanthanum and cobalt is greatly improved, the internal current of the ferrite under high voltage is reduced, meanwhile, the magnetic performance is ensured, and the application of the ferrite under high frequency is promoted.

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.

The invention relates to the technical field of seawater desalination, in particular to a degradable and recyclable solar seawater desalination evaporator and a preparation method thereof. The degradable and recyclable solar seawater desalination evaporator comprises a water supply layer and an evaporation layer, the water supply layer is made of carrageenan hydrogel; the evaporation layer is made of ferroferric oxide / yttrium iron garnet ferrite / carrageenan composite hydrogel. The degradable and recyclable solar seawater desalination evaporator disclosed by the invention can efficiently evaporate seawater into water vapor under the irradiation of sunlight, so that the yield of fresh water is increased. The photo-thermal conversion efficiency is high, and solar energy resources can be fully utilized. The evaporator also has the advantages of degradable recovery and magnetic recovery, and the cost and the environmental influence are reduced.