108 results about "Ferrite (magnet)" patented technology

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 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 application discloses a kind of injection molding magnetic ferrite composite material and preparation method thereof, by following weight percentage component composition: modified ferrite magnetic powder 82%-90%, composite binder 7%-15%, coupling agent 0.3%-0.8%, lubricant 0.5%-1.2%, antioxidant 0.2%-0.5%, reinforcing agent 0.3%-1.0%;The composite binder is mixed by nylon 6, nylon 12 and polyphenylene sulfide according to weight ratio 2:1:0.5-1, the injection molding magnetic ferrite composite material and preparation method thereof, make composite material have good injection molding fluidity, can be prepared shape complex, size tiny magnetic component device, forming precision is high, without subsequent processing, further improve production efficiency, reduce production cost.

The utility model relates to ferrite magnetic column grinding technical field, specifically disclose a kind of grinding equipment for ferrite magnetic column, including equipment shell, the upper end inside the equipment shell is equipped with mounting seat, the inside mounting seat is equipped with the fixed bolt of equipment shell screw connection, the upper surface of mounting seat is equipped with the grinding mechanism for grinding workpiece, the upper of grinding mechanism is equipped with the clamping mechanism for clamping workpiece;The grinding mechanism includes grinding piece, and the grinding piece is fixed on the upper surface of mounting seat.The grinding mechanism of being set, the outer surface of magnetic column can be ground, dust is sucked into filter piece by negative pressure fan, air can filter larger dust impurities in air when passing through first filter screen, again pass through second filter screen and filter smaller dust in air, when manually pulling movable plate, first filter screen can be extracted from filter piece, convenient for cleaning replacement.

A high-power, high-temperature-stability M-type strontium ferrite belongs to the field of ferrite material preparation technology. The ferrite comprises a main formulation of SrCO3, La2O3, CaCO3, MnO, SnO2, Fe2O3, and Co2O3, and additives composed of CaCO3, SiO2, H3BO3, and La2O3. This invention introduces Sn-Mn ions for co-substitution, thereby constructing a Sn... 4+ -Mn 2+ The charge balance mechanism effectively suppressed the Fe ionization induced by the introduction of high-valence ions. 3+ To Fe 2+ Price change behavior, effective compensation after replacement due to the introduction of non-magnetic Sn 4+ This results in a loss of lattice magnetic moment. Simultaneously, through a stepped pre-sintering and sintering process, a CoFe2O4 hard magnetic spinel phase is induced to precipitate in the M-type strontium ferrite main phase. The negative coercivity temperature coefficient of the CoFe2O4 phase complements the inherent positive temperature coefficient of the matrix.

A coil component, a circuit board, and an electronic device are provided. A coil component of one embodiment includes a magnetic core including a plurality of ferrite crystal grains and a plurality of Bi-segregation regions existing at grain boundaries of the plurality of ferrite crystal grains, and a winding wound around the magnetic core. In one embodiment, a plurality of line profiles obtained by detecting the content of Bi along a plurality of scan lines intersecting the grain boundaries includes at least one first line profile including a detected peak of Bi at the grain boundary, and a plurality of second line profiles not including the detected peak.

This application discloses a DC-resistant MnZn ferrite material, its preparation method, and its application. The DC-resistant MnZn ferrite material comprises: a main material of MnZn ferrite; a first additive, calculated as oxides by weight percentage of the main material, including 0.3 wt% Co₂O₃, 0.05 wt% ZrO₂, 0.03 wt% V₂O₅, and 0.15 wt% CaO; and a second additive, calculated as oxides by weight percentage of the main material, including 0.1–0.5 wt% YIG ferrite particles. The preparation method is an oxide ceramic method, where the green body is sintered in stages by controlling the temperature and oxygen partial pressure. The MnZn ferrite material of this application, through cobalt doping, YIG ferrite composite, and adjustment of the sintering process, exhibits excellent morphology and combines high magnetic permeability with superior DC-resistant properties.

This utility model discloses a high-voltage DC relay with a dual-magnetic steel structure, comprising: a housing, two sets of stationary contacts arranged inside the housing with their tops extending to the outside of the housing, an inner support cover inside the housing, an outer iron core inside the inner support cover, a shaft body at the center of the outer iron core, a moving contact at the upper end of the shaft body, and a bracket at the lower part of the moving contact. This utility model uses a dual-magnetic steel structure made of ferrite and neodymium iron boron materials, which features high temperature resistance and strong magnetism. The temperature generated during relay operation has a relatively small impact on the magnets, avoiding the situation where the product's electrical life is shortened due to excessively high operating temperature. Furthermore, the structural changes of this new product broaden its applications, and the improved temperature resistance of the magnets enhances the stability of the relay during operation.

This invention relates to the field of permanent magnet ferrite product manufacturing technology, specifically disclosing a wet-pressed permanent magnet ferrite tile mold, including a middle mold, an upper mold, and a lower die. The middle mold has an outer arc, an outer arc bevel, and a plane, and a cavity with a material injection port. The upper mold has an outer arc, an outer arc bevel, and a plane, and an arc-shaped top surface and a water-drawing groove. The mold of this invention includes a middle mold, an upper mold, and a lower die. During assembly, the upper mold aligns sequentially with the middle mold through its outer arc, outer arc bevel, transition fillet, and plane. The lower die is inserted into the middle mold. The good fit between the upper and middle molds prevents material leakage, reduces stress during product demolding, and lowers the frequency of edge cracks in the product.

This invention discloses a method for preparing highly stable gyromagnetic ferrites, belonging to the field of magnetic material preparation technology. The method includes formulation preparation, multi-stage sand milling and granulation, molding and sintering, composite structure preparation, and precision machining steps. The formulation consists of VIII-series, IIIB-series, lanthanide-series, IVB-series, and VIIB-series metal oxides in a specific molar ratio, with rare earth nano-additives added to enhance lattice stability. Uniform slurry particle size is achieved through two-stage sand milling and spray granulation. A curved sintering process is used to control the temperature rise and oxygen content to obtain a high-density green body. A yttrium iron garnet or dysprosium iron garnet functional layer is formed on the surface of the green body by magnetron sputtering, constructing a multi-layer composite structure. Finally, a conductive modification layer is formed on the surface through integrated laser cutting and chemical mechanical polishing. The gyromagnetic ferrite material prepared by this method exhibits high saturation magnetization, low high-frequency loss, and excellent thermal stability, making it suitable for 5G communication, radar, and high-frequency microwave devices.

This invention provides a device for preparing anisotropic annular sintered ferrite magnets, belonging to the field of sintered ferrite magnet preparation technology. It includes a frame, a forming mold assembly mounted on the frame and equipped with an anisotropic orientation magnetic field generating mechanism, a sintering mechanism, and a conveying assembly connecting the forming mold assembly and the sintering mechanism. By integrating the frame, forming mold assembly, sintering mechanism, and conveying assembly, the device constructs a complete integrated preparation system. The annular female mold, central mandrel, and upper and lower pressure heads of the forming mold assembly form a forming cavity adapted to the anisotropic annular magnet, providing a stable structural foundation for magnetic powder filling, orientation, and forming. This achieves a smooth connection between magnetic powder forming and subsequent sintering, effectively solving the problems of low preparation efficiency and poor product quality caused by the disconnection of various stages in traditional devices, and laying a structural foundation for improving the magnetic properties of the magnets and the yield rate of the finished product.

This invention provides a rotor structure, its molding method, and a motor. The rotor structure includes: radial plastic magnets (6), with multiple radial plastic magnets (6) arranged circumferentially at intervals, forming mounting grooves (5) between adjacent radial plastic magnets (6); tangential ferrites (2), disposed within the mounting grooves (5) and used to form a tangential magnetic field; axial plastic magnetic disks (4), disposed at both axial ends of the radial plastic magnets and used to form an axial magnetic field; and a plastic-coated shell (1), encasing the radial plastic magnets (6), tangential ferrites (2), and axial plastic magnetic disks (4), and injection molding the radial plastic magnets (6), tangential ferrites (2), and axial plastic magnetic disks (4) into a single unit. According to the rotor structure of this invention, the assembly difficulty of the rotor structure can be reduced, the assembly effect improved, and the working performance and reliability of the motor guaranteed.

The application discloses a kind of ferrite gyromagnetic nonlinear loss transient response theoretical model and parameter simulation method under vertical pumping configuration, belong to microwave technical field, including the following steps: obtaining ferrite material parameters and target excitation microwave signal parameters, signal parameter at least includes microwave signal frequency, pulse width tau;Pulse width dependent function for representing consistent precession magnetic moment and the coupling strength of non-consistent precession magnetic moment (spin wave) is constructed.In view of this, the application first establishes the quantitative relationship model between the excitation microwave pulse width tau and the nonlinear loss excitation threshold (tau) in the theoretical framework of vertical pumping configuration, establishes the quantitative relationship model between the excitation microwave pulse width tau and the nonlinear loss excitation threshold (tau).The model can accurately describe the nonlinear effect of ferrite under nanosecond transient pulse excitation, and the dynamic law of the excitation condition and the change of pulse width.For the design of ferrite limiter device facing high-power microwave electromagnetic environment, important theory and design basis are provided.

The present disclosure provides an epitaxial structure, a preparation system thereof and a semiconductor device. The preparation system of the epitaxial structure comprises: a reaction chamber for epitaxially growing a magnetic layer of a gyromagnetic ferrite on a semiconductor substrate; and a first magnetic field generating device for generating a magnetic field in the reaction chamber, wherein the magnetic field has a magnetic field component parallel to the surface of the semiconductor substrate. The preparation system provided by the present disclosure is integrated with the first magnetic field generating device, and by applying a magnetic field with a magnetic field component parallel to the surface of the semiconductor substrate in the reaction chamber, the reaction and crystallization process of reaction gas atoms in the reaction chamber can be affected, so as to change the crystallization orientation, and the in-plane uniaxial magnetic anisotropy can be induced even on a non-textured semiconductor substrate, so as to grow the magnetic layer of the gyromagnetic ferrite with strong crystallographic texture, and further to realize mass production of the magnetic layer of the gyromagnetic ferrite on the non-textured semiconductor substrate.

The utility model discloses a kind of permanent magnet ferrite magnet tile-shaped product mould, belong to magnet production technical field, including lower die holder, lower mould, for the lower pressing assembly of tile-shaped magnet forming and the connecting assembly for the demolding of tile-shaped magnet after forming, the lower mould is fixedly arranged in the inside of lower die holder, the inside of the lower mould is provided with cavity, the outside wall of the lower mould is provided with closed groove, the positioning groove is communicated with closed groove, the lower mould is attached with core rod by cavity and closed groove;Through the effect of lower pressing assembly, pressure is applied to magnet raw material inside cavity, by the cooperation of core rod and side plate, the magnet raw material is formed into tile, then through the effect of connecting assembly, when lower pressing assembly moves upward, the core rod and side plate move upward, so that the tile-shaped magnet after forming is separated from lower mould, and then the tile-shaped magnet after forming is discharged, and the maintenance of core rod is facilitated.

This invention discloses a nested ferrite switch based on a composite magnetic circuit, belonging to the field of microwave device technology. It includes a central ferrite rod (1), an insulating dielectric sleeve (2), an excitation coil (3), and a dielectric substrate (5). A coplanar waveguide transmission line (6) is provided on the dielectric substrate (5). The central ferrite rod (1) is embedded in the central junction of the coplanar waveguide. A soft magnetic metal yoke (4) with a magnetic flux density of 2 to 5 times the saturation magnetization of the ferrite is provided outside the central ferrite rod (1). This invention uses a coplanar waveguide and a special magnetic yoke design for the ferrite switch, which can achieve the advantages of high power capacity and wide bandwidth. Through simulation design, the relative bandwidth of the ferrite switch designed with this structure can reach more than 15%.

This invention provides a rotor structure, its molding method, and an electric motor. The rotor structure includes: an outer rotor core (6), with multiple outer rotor cores (6) arranged circumferentially at intervals, and mounting grooves (5) formed between adjacent outer rotor cores (6); tangential ferrite (2), disposed within the mounting grooves (5) and used to form a tangential magnetic field; an axial plastic magnetic disk (4), disposed at both axial ends of the outer rotor core and used to form an axial magnetic field; and a plastic-coated shell (1), which wraps around the outer rotor core (6), tangential ferrite (2), and axial plastic magnetic disk (4), and injection molds the outer rotor core (6), tangential ferrite (2), and axial plastic magnetic disk (4) into a single unit. According to the rotor structure of this invention, the assembly difficulty of the rotor structure can be reduced, the assembly effect improved, and the working performance and reliability of the electric motor guaranteed.

This invention relates to the field of iron and steel metallurgy, specifically to an ultra-low temperature austenitic stainless steel bar without δ-ferrite phase and its production method. The composition of the ultra-low temperature austenitic stainless steel bar, by total weight percentage (100%), is: C≤0.05%, Si 0.20%-0.80%, Mn 9.0%-15.0%, P≤0.01%, S≤0.002%, Cr 10.0%-15.0%, Ni 10.0%-18.0%, Mo 4.0%-10.0%, N 0.2%-0.4%, Ce or Y≤0.015%, with the remainder being Fe and unavoidable impurities, satisfying Fn < 1.2, where Fn = (K Cr ×Cr%+1.37×K Mo ×Mo%+1.5×K Si ×Si%) / (K Ni ×Ni%+30C%+0.5×K Mn ×Mn%+25N%),1.0≤K Si ≤1.20, 1.0≤K Cr ≤1.10, 0.95≤K Ni ≤1.0, 1.0≤K Mo ≤1.8, 1.0≤K Mn ≤1.5. The technical solution disclosed in this invention fundamentally suppresses the precipitation of δ-ferrite phase from the solidification source through a "precise composition design + synergistic process control" approach, ultimately producing δ-ferrite-free ultra-low temperature austenitic stainless steel with a relative magnetic permeability μ. r ≤1.01.

The application relates to a high-frequency transformer magnetic core precise centering assembly device, which comprises a base, the top of the base is provided with a sliding frame, the top of the sliding frame is slidably connected with two bearing housings, the two bearing housings are provided with a magnetic core to be assembled for a high-frequency transformer, the inside of the bearing housing is provided with a fixing mechanism, the outside of the bearing housing is provided with a buffer mechanism, the buffer mechanism comprises a sliding rail fixedly connected to the outside of one of the bearing housings, the outside of the sliding rail is slidably connected with a floating block, the front end of the floating block is fixedly connected with a pressing rod, the outside of the other bearing housing is fixedly connected with a pressure transmission box, the outside of the pressure transmission box is fixedly connected with a hydraulic oil cylinder, and the hydraulic oil cylinder and the pressure transmission box are in communication. The application realizes automatic adjustment and closed-loop control of the pressing force, thereby limiting the maximum pressing force, avoiding damage of ferrite collapse and skeleton deformation, and ensuring stable output of the pressing force in the pressing process, so that the product qualification rate and long-term reliability are improved.

The present application relates to the technical field of soft magnetic ferrite production, and discloses a magnetic grinding mud recovery device, which comprises a sewage pool and a rack, a roller is arranged to rotate horizontally inside the sewage pool, a plurality of openings are formed on the surface of the roller, a closing plate is hingedly arranged at each opening, an electromagnet is arranged outside the closing plate, support plates and conductive rings are arranged on the two sides of the roller, the support plates and the conductive rings are fixedly connected with the rack, an adjusting rod is arranged on the closing plate, the adjusting rod extends to the middle of the conductive ring and the support plate, an adjusting gap is arranged above the support plate, a collecting pipe is arranged inside the roller, an opening is formed on the upper end of the collecting pipe, the opening of the collecting pipe is connected with the opening of the closing plate when the closing plate is opened downward, a conveying mechanism for conveying the grinding mud is arranged inside the collecting pipe, and a driving mechanism for driving the roller to rotate is arranged on the rack. The present application can more conveniently recover the magnetic grinding mud.

The utility model discloses a multilayer shielding anti -interference camera head line, including the line body, the both ends of line body all have ferrite magnetic ring of sleeve joint, the inside of line body is by multilayer shielding layer, cross insulated partition, power cord and signal line is composed, power cord and signal line all are provided with two groups, and two groups power cord and signal line are through cross insulated partition and are alternately separated, the outside of cross insulated partition, power cord and signal line is covered with multilayer shielding layer, through the design of multilayer shielding structure, effectively improved the anti -interference ability of camera head line, especially in high -frequency signal transmission process, can significantly reduce electromagnetic interference (EMI) and radio frequency interference (RFI) to the influence of image quality and signal stability. The combined use of aluminum foil shielding layer, braided copper mesh, conductive cloth and kevlar fiber layer realizes the comprehensive shielding to high low frequency mixed interference, ensures the clear transmission of signal.

The application relates to a high-entropy rare earth ferrite ceramic material and a preparation method thereof, and belongs to the field of ceramic materials. The high-entropy rare earth ferrite ceramic material is a single crystal structure, and has a general chemical formula of Bi 0.2 La 0.2 Y 0.2 Dy 0.2 Tb 0.2 Fe 0.975 Ti 0.025 O3- z wt.%MnCO3, wherein z The value range of x is 0.25-1. The high-entropy rare earth ferrite ceramic synthesized by the high-entropy rare earth ferrite ceramic material preparation method has excellent performances such as small grain size, low room-temperature dielectric loss, small leakage current density and good ferromagnetism.

The utility model provides a can eliminate the shuttle core pipe of inertia relates to the textile tool technical field, include: the shuttle core pipe main part, the outer surface left edge of shuttle core pipe main part is established with the outer ring groove, the outer ring groove is closely sleeved and has the magnetism pipe sleeve, the magnetism pipe sleeve is made of the plastic injection of mixed ferrite magnetic powder, the outer ring groove groove surface in the convex has two place strip structure's ring groove directional relief, two place ring groove directional relief take the axis of the shuttle core pipe main part as the axle, the axle symmetry distribution is in the outer ring groove groove surface, compared with the way of embedding ferrite magnet in the prior art, the amount of ferrite magnet is reduced, the effect of saving cost is played, the assembly mode is more fast, and the assembly is more firm, solve the problem that the existing way of embedding ferrite magnet carries out the brake to the shuttle core pipe, the production cost is higher, the embedding process of ferrite magnet is complicated, because the size of shuttle core pipe and ferrite magnet is small, will further increase the assembly and manufacturing difficulty of shuttle core pipe.

This invention relates to the field of metal surface processing technology, specifically to a crack-resistant cooling device for ferrite magnets. The device includes a placement platform, a high-temperature liquid pump, a mounting base, a base, a crack-resistant protection mechanism, a positioning cylinder, a moving component, and a driving component. The mounting base is fixedly connected to the placement platform, and the positioning cylinder is fixedly connected to the mounting base. The moving component and the driving component are both mounted on the positioning cylinder. The base moves on the placement platform via the moving component, and the crack-resistant protection mechanism is mounted on the base. During use, when the position of the base needs adjustment, the driving component is activated. The driving component drives the moving component to move on the positioning cylinder, causing the moving component to move the base on the placement platform. This automatically adjusts the position of the base, allowing it to contact the workpiece surface with the crack-resistant protection mechanism for cooling. This reduces manual labor intensity and is convenient to use.

In one aspect, disclosed is a method for manufacturing non-oriented electrical steel sheets with excellent magnetic properties and the non-oriented electrical steel sheets produced thereby. In a specific embodiment, the method for manufacturing non-oriented electrical steel sheets with excellent magnetic properties includes the steps of: manufacturing a hot-rolled steel sheet using a slab containing 0.4-3.5 wt % of silicon (Si), 0 (exclusive) to 0.05 wt % (inclusive) of aluminum (Al), 0.002-3.5 wt % of austenite stabilizing elements, and the balance of iron (Fe) and other inevitable impurities; cold rolling the hot-rolled steel sheet to prepare a cold-rolled steel sheet; and cold-annealing the cold-rolled steel sheet, wherein the cold-annealing includes a primary heat treatment step of heating and maintaining the cold-rolled steel sheet up to the temperature of the austenite single-phase region; and a secondary heat treatment step of cooling and maintaining the primary heat-treated cold-rolled steel sheet down to the temperature of the ferrite and austenite dual-phase region.

This invention relates to the field of ferrite technology and discloses a magnetic core forming mold and its manufacturing method. The magnetic core forming mold includes: a first mold body having a first cavity; a second mold body disposed within the first cavity; the second mold body is hollow inside, forming a second cavity; the second mold body has a first forming surface, a second forming surface, and a third forming surface, the first forming surface being located on one side of the second mold body along the third direction, the second forming surface surrounding the second cavity circumferentially, and the third forming surface being located on the side of the second mold body opposite to the second cavity; a composite chamfer surface is formed at the junction of the first forming surface and the second forming surface, and at the junction of the first forming surface and the third forming surface; the composite chamfer surface has recesses, and multiple recesses are spaced circumferentially on the composite chamfer surface; a plating layer is disposed within the recesses, and the side of the plating layer opposite to the recesses is flush with the composite chamfer surface. The magnetic core forming mold provided by this invention can enhance the flow effect of magnetic core powder and improve the cracking degree at the junction of magnetic core blanks.