38 results about "Ferrite layer" patented technology

A magnetic composite includes: a non-metallic inorganic base material; and a ferrite layer provided on a surface of the non-metallic inorganic base material, and the non-metallic inorganic base material has a thickness of 2.0 μm or more, the ferrite layer has a thickness (dF) of 2.0 μm or more and 50.0 μm or less, and contains spinel-type ferrite as a principal component, and a content of α-Fe2O3 in the ferrite layer is 3.0 mass % or more and 25.0 mass % or less.

The invention relates to the technical field of sensors, and particularly discloses a pre-embedded sensor based on electric field and magnetic field decoupling energy and signal simultaneous transmission and a corresponding energy and signal simultaneous transmission system. The sensor is provided with a secondary side coupler with a specific hierarchical structure, the secondary side coupler comprises a first ferrite layer, a 2 * 2 array metal pole plate layer, a second ferrite layer and a coil layer, the secondary side coupler is matched with a primary side symmetrical coupler, and an independent power transmission and bidirectional signal transmission channel is constructed by utilizing the near-field electromagnetic decoupling characteristic. According to the system, the resonance compensation network and the modulation-demodulation and crosstalk suppression circuit are integrated, so that effective decoupling between energy and signals and between uplink and downlink signals is realized, and the transmission efficiency and the communication reliability are remarkably improved. Experiments show that the system can realize high-efficiency energy transmission and stable bidirectional full-duplex communication, is excellent in performance in large data volume transmission, and provides a high-reliability integrated power supply and data transmission solution for pre-embedded scenes such as concrete structures.

A coil component includes a base body including a multilayer body in which a first ferrite layer, a second ferrite layer, a glass layer, a third ferrite layer, and a fourth ferrite layer are stacked in this order; a coil inside the glass layer; and an outer electrode on an outer surface of the base body and electrically connected to the coil. A ferrite material that constitutes the first, second, third and fourth ferrite layers contains X (X≥0) mol % of Zn in terms of ZnO and Y (Y≥0) mol % of Ni in terms of NiO, and X+Y>0, when the amounts of Fe, Zn, Cu, and Ni are respectively expressed in terms of Fe2O3, ZnO, CuO, and NiO, and the total amount of Fe2O3, ZnO, CuO, and NiO is 100 mol %.

This invention provides an aluminum-silicon coated hot-stamped component, its preparation method, and its application. The component includes a steel plate substrate and an aluminum-silicon coating disposed on at least one surface of the steel plate substrate. The aluminum-silicon coating includes a low-aluminum ferrite layer with an aluminum content of less than 5 wt%, and the thickness of the low-aluminum ferrite layer is greater than 5 μm. The maximum bending angle of the aluminum-silicon coated hot-stamped component is greater than 65°. This invention significantly increases the thickness of the low-aluminum, tough ferrite layer in the aluminum-silicon coating after hot stamping, reaching 5-100 μm, by improving the hot stamping process. This effectively prevents the formation or propagation of surface or coating cracks, improving the bending performance of the pre-coated steel plate after hot stamping. Simultaneously, the hot stamping process of this invention takes into account or optimizes the microstructure of the steel matrix, further enhancing the overall bending and tensile properties of the material.

A coil component (1) is provided with: a green body (10) comprising a laminate in which a first ferrite layer (17a), a second ferrite layer (16a), a glass layer (15), a third ferrite layer (16b), and a fourth ferrite layer (17b) are laminated in this order; a coil (30) provided inside the glass layer (15); and an external electrode (20) provided on the outer surface of the element (10) and electrically connected to the coil (30), the ferrite materials constituting the first ferrite layer (17a), the second ferrite layer (16a), the third ferrite layer (16b), and the fourth ferrite layer (17b) containing X (X > = 0) mol% of Zn and Y (Y > = 0) mol% of Ni in terms of Zn and Ni in terms of ZnO and NiO, respectively, when Fe, Zn, Cu, and Ni are converted into Fe2O3, ZnO, CuO, and NiO, respectively, and the total content of Fe2O3, ZnO, CuO, and NiO is 100 mol%. X + Y > 0, X / (X + Y) of the ferrite material constituting the second ferrite layer (16a) and the third ferrite layer (16b) is 0 to 0.73 inclusive, and X / (X + Y) of the ferrite material constituting the first ferrite layer (17a) and the fourth ferrite layer (17b) is more than 0.73 and 1.0 or less.

An LC composite part 1A comprises: an element body 10 formed by laminating ferrite layers 15 in the lamination direction; internal electrode layers 20 that are laminated in the lamination direction with the ferrite layers 15 therebetween inside the element body 10 and extend along the ferrite layers 15 in the plane direction perpendicular to the lamination direction; a first external electrode 30 provided on the surface of the element body 10; and a second external electrode 40 provided, on the surface of the element body 10, at a position away from the first external electrode 30. The internal electrode layers 20 include first capacitor electrode layers 22 that are not electrically connected to the second external electrode 40 and are electrically connected to the first external electrode 30, second capacitor electrode layers 23 that are not electrically connected to the first external electrode 30 and are electrically connected to the second external electrode 40, and an inductor electrode layer 21 located on the same main surface of a corresponding ferrite layer 15 and electrically connected to the first external electrode 30 and the second external electrode 40. The LC composite part has an inductor portion LP including the inductor electrode layer 21, and a capacitor portion CP which is provided on at least one side in the lamination direction with respect to the inductor portion LP and in which the first capacitor electrode layers 22 and the second capacitor electrode layers 23 are opposite to each other with the ferrite layers 15 therebetween.

A card element for a chip card, includes an outer metal layer with a flat surface interrupted only by a module opening for receiving a chip module. The module opening extends to an inner side and includes a ferrite layer located on the inner side and through which the opening extends. An inner metal layer is disposed on the ferrite layer through which a portion of the module opening has a reduced cross-section extends. A slit extends from a peripheral surface of the inner metal layer to the module opening and extends through the entire thickness of the inner metal layer. A final layer is made of plastic and disposed on the inner metal layer.

The present application discloses a magnetic shielding structure, a manufacturing method thereof, and a wireless charging system, the magnetic shielding structure comprising a magnetic shielding plate, a ferrite layer, and a nanocrystalline layer, the ferrite layer comprising a plurality of ferrite sheets laid flat on the magnetic shielding plate, the nanocrystalline layer laid flat on the ferrite layer, the nanocrystalline layer comprising a plurality of stacked nanocrystalline strips and an insulating tape positioned between two adjacent nanocrystalline strips, the insulating tape being configured to bond the two adjacent nanocrystalline strips, the nanocrystalline layer having a plurality of through holes penetrating the nanocrystalline layer along the stacking direction, the plurality of through holes being uniformly spaced apart.

The invention belongs to the technical field of educational toys, and relates to an anti-scattering magnetic adsorption jigsaw system. The system comprises a jigsaw picture, a flexible magnetic jigsaw plate and a magnetic jigsaw storage disc, ndFeB miniature permanent magnets are embedded in the back face of a base body of the The flexible magnetic jigsaw puzzle is prepared by mixing ferrite powder and flexible high polymer materials such as PVC or rubber, and can be curled and stored; a ferrite layer is embedded in the magnetic jigsaw storage disc, and an anti-slip high edge is arranged on the edge. And the jigsaw pieces are respectively in magnetic adsorption fit with the flexible magnetic jigsaw plates and the magnetic jigsaw storage disc through the permanent magnets on the back surfaces. According to the jigsaw puzzle, the risk that the jigsaw puzzles are scattered due to inclination or shaking can be effectively reduced in the jigsaw puzzle process, multiple jigsaw puzzle postures are supported, the jigsaw puzzles can be conveniently classified and stored, the whole jigsaw puzzle can be attracted to ferromagnetic metal surfaces such as a refrigerator door or a magnetic white board or a metal wall face after jigsaw puzzle is completed, and mounting-free display is achieved.

An integrated circuit (IC) package has a ferrite-dielectric shield layer between a planar inductor coil and a semiconductor chip. The shield layer blocks electromagnetic interference (EMI) generated by current in the inductor coil from reaching the semiconductor chip. The shield layer has a ferrite layer surrounded by upper and lower dielectric layers to prevent electrical shorting. A center terminal of the inductor coil is connected to the semiconductor chip through a center post that passes through an opening in the shield layer over the center of the inductor coil air core. The center post can be connected to a chip mount pad on which the semiconductor chip is mounted. Wire bonds connect pads on the semiconductor chip to lead frame pads on lead frame posts whose distal ends are external package connectors. The outer terminals of the inductor coil are connected to lead frame outer posts that also have external package connectors, such as pins or solder balls.

Techniques and mechanisms for delivering electrical power using a transformer are disclosed. In an embodiment, the transformer includes a dielectric plate structure, a first conductor, a ferromagnetic material layer disposed around a primary winding of the first conductor, and a second conductor forming a secondary winding around the ferromagnetic material layer. For one of the primary windings or one of the secondary windings, the cross-section of the winding conforms to a rectangle, where the width of the cross-section is greater than the height of the cross-section. The ferromagnetic material of the ferrite layer extends between consecutive primary windings in the primary winding. In another embodiment, the volume fraction of the ferromagnetic material in the ferrite layer is equal to or less than ninety-seven percent (97%).

The present invention provides an NFC antenna, comprising a magnetic isolation component and an FPC component stacked in sequence; the magnetic isolation component comprises a magnetic isolation adhesive layer, a ferrite layer, and a cover film layer stacked in sequence; the FPC component comprises an adhesive layer, a base layer, and a coil layer stacked in sequence; the coil layer comprises a first routing line and a second routing line; the first routing line is provided with a first feeding point at one end close to the inner side of the coil layer; the second routing line is provided with a second feeding point at one end close to the inner side of the coil layer; a spring is provided in the middle of the adhesive layer; the spring is provided with a conductive member at positions corresponding to the first feeding point and the second feeding point; when an extra layer of FPC is attached, the first feeding point and the second feeding point will be short-circuited, and the inductance and frequency of the NFC antenna will be greatly changed, which is easy to detect. This solves the problem of difficulty in detecting extra FPC during NFC antenna processing in the past.

The utility model discloses a heat-dissipating, shielding and wave-absorbing adhesive tape easy to disassemble. Comprising a graphite layer, a first high-temperature-resistant acrylic adhesive layer arranged on the upper end face of the graphite layer, a ferrite layer arranged on the upper end face of the first high-temperature-resistant acrylic adhesive layer, a second high-temperature-resistant acrylic adhesive layer arranged on the upper end face of the ferrite layer and a foam layer arranged on the upper end face of the second high-temperature-resistant acrylic adhesive layer. The third high-temperature-resistant acrylic adhesive layer is arranged on the lower end face of the graphite layer, the metal foil is arranged on the lower end face of the third high-temperature-resistant acrylic adhesive layer, and the electric viscosity reducing adhesive layer is arranged on the lower end face of the metal foil. The adhesive tape has the advantages that the whole adhesive tape can form a passage between a pasted product and the metal foil layer according to the heavy industry requirement, so that the viscosity of the electric viscosity-reducing adhesive layer is reduced after current passes through, and the adhesive tape can be quickly torn off from the pasted product. When the whole adhesive tape is used for protecting an adhered object, the functions of buffering, wave-absorbing shielding, heat dissipation and convenient disassembly are achieved.

The application discloses a magnetic shielding structure and a manufacturing method thereof and a wireless charging system, and belongs to the technical field of wireless charging, wherein the magnetic shielding structure comprises a magnetic isolation plate, a ferrite layer and a nanocrystalline layer; the ferrite layer comprises a plurality of ferrite sheets which are laid on the magnetic isolation plate; the nanocrystalline layer is laid on the ferrite layer and comprises a plurality of layers of nanocrystalline strip materials which are arranged in a stack and insulating adhesive tapes which are arranged between two adjacent layers of the nanocrystalline strip materials; the insulating adhesive tapes are used for bonding the adjacent nanocrystalline strip materials; the nanocrystalline layer has a plurality of through holes which penetrate through the nanocrystalline layer along the stacking direction, and the plurality of through holes are uniformly and spacedly distributed. The magnetic shielding structure, the manufacturing method thereof and the wireless charging system provided by the application can relieve the heating condition in the charging process and have a relatively high electric energy transmission efficiency.

The application relates to the technical field of filters, in particular to a filter and a manufacturing method thereof and electronic equipment. The filter comprises a main body and an inner electrode. The main body comprises a first magnetic ferrite layer, a first non-magnetic ferrite layer and a second magnetic ferrite layer which are sequentially stacked. The inner electrode is arranged in the first non-magnetic ferrite layer. The material of the first magnetic ferrite layer, the second magnetic ferrite layer and the first non-magnetic ferrite layer at least contains Ni elements and Zn elements. The molar ratio n(Ni) : n(Zn) of the Ni elements and the Zn elements in the first non-magnetic ferrite layer is r1, the molar ratio n(Ni) : n(Zn) of the Ni elements and the Zn elements in the first magnetic ferrite layer is r2, and the molar ratio n(Ni) : n(Zn) of the Ni elements and the Zn elements in the second magnetic ferrite layer is r3, r1 < r2, and r1 < r3, so that the filter has good co-firing matching, and the reliability of the filter is improved.

The present invention addresses the problem of obtaining a welded joint having excellent LME resistance during production. This welded joint is characterized by being provided with a plurality of steel plates that overlap each other, a nugget that joins the plurality of steel plates together, a spot-welded section that has a pressure-welded section and a heat-affected section that are formed around the nugget, a non-heat-affected section that is a region outside the heat-affected section, and a separation section that is formed around the pressure-welded section, at least one steel sheet disposed on the outermost side among the plurality of steel sheets is a high-strength steel sheet having a Vickers hardness of 240 Hv or more at the center of the sheet thickness, the high-strength steel sheet having a predetermined chemical composition, and the thickness of the high-strength steel sheet being less than the thickness of the steel sheet at a position 50 [mu] m outward from the end of the pressure-welded section. A high ferrite layer having a ferrite phase area ratio of 90% or more is present at a thickness of 5 [mu] m or more in the thickness direction from the surface, and a B-concentrated portion having a B strength of two or more times the B strength at a depth of 50 [mu] m determined by TOF-SIMS measurement is present at a thickness of 1.0 [mu] m or more from the surface.

The invention discloses an under-screen NFC (Near Field Communication) structure, a display screen module and electronic equipment. The under-screen NFC structure comprises a metal shading plate and an NFC antenna. A hollow area is arranged on the metal shading plate, and a frame area is formed between the hollow area and the edge of the metal shading plate; the NFC antenna is arranged on the frame area in a stacked mode and covers part of the hollow area. A first ferrite layer is arranged between the frame area and the NFC antenna. According to the invention, the overall design and display performance of the display screen module are not affected while the performance of the NFC antenna under the screen is improved, and the balance between the design of the display screen module and the user experience is realized.

An Al—Si coated press hardening component, wherein the Al—Si coating comprises a low-Al content ferrite layer with an Al content of less than 5 wt % and a thickness of greater than 5 μm, and having a maximum bending angle of the Al—Si coated press hardening component is greater than 65°. The thickness of the tough low-Al content ferrite layer in the Al—Si coating after hot stamping, reaching 5-100 μm, by improving the hot stamping process, so that the formation or propagation of cracks on the surface or the coating is effectively prevented, and the bendability of the pre-coated steel after hot stamping is improved. At the same time, the hot stamping process of the present invention can take into account or optimize the microstructure of the steel substrate to further improve the bendability and tensile property of the whole material.

The utility model discloses a magnetic suction line with a composite shielding jacket, which relates to the technical field of magnetic connection, and comprises a magnetic line, a composite shielding component is fixedly connected in the magnetic line, the composite shielding component comprises a woven mesh, the woven mesh is fixedly connected in the magnetic line, a copper foil wire is fixedly connected in the woven mesh, and the copper foil wire is fixedly connected in the magnetic line. According to the magnetic attraction wire with the composite shielding jacket, the copper foil wires and the tinned copper wires are arranged, when the magnetic attraction wire is used, through the outermost woven net formed by weaving the copper foil wires and the tinned copper wires, the double composite materials can provide a more uniform shielding effect, and the magnetic attraction wire has better flexibility and durability; meanwhile, the ferrite layer can effectively absorb and attenuate energy of an external electromagnetic field, the aluminum foil layer can effectively block interference of the external electromagnetic field and protect transmission of the internal signal line, electromagnetic interference is prevented through three-layer protection, and the problem that the device cannot effectively shield the electromagnetic interference is solved.

The present invention discloses a transmitting component for wireless charging of an electric vehicle, comprising a non-metallic shell, a transmitting coil, a transmitting magnetic core and a metal shell assembled in sequence from top to bottom. The transmitting magnetic core comprises at least two layers of staggered stacked ferrite layers, and each ferrite layer is spliced ​​by a number of ferrites. The ferrite layer corresponding to the periphery of the transmitting coil is close to the transmitting coil, and the remaining ferrite layers corresponding to the center position of the transmitting coil are indented in sequence and gradually move away from the transmitting coil. The projection of the shape of all the stacked and spliced ​​ferrite layers on the plane corresponds to the shape of the transmitting coil. The present invention also discloses a charging component for wireless charging of an electric vehicle, comprising a transmitting component and a receiving component arranged in parallel, which solves the problem of uneven distribution of the transmitting magnetic field, suppresses magnetic saturation, and improves the efficiency of wireless charging.

The composite heat dissipation structure includes a grid tape, a buffer layer and a ferrite layer that are stacked in sequence, and a flexible printed circuit board arranged at one side of the ferrite layer facing the grid tape. The flexible printed circuit board includes a substrate and a conductive layer on at least one side of the substrate. The conductive layer has a heat dissipation pattern and a communication antenna pattern, and an orthographic projection of the heat dissipation pattern on the substrate and an orthographic projection of the communication antenna pattern on the substrate do not overlap each other.

The application discloses a magnetic circuit structure of a circulator, the circulator and electronic equipment. The magnetic circuit structure comprises a first magnet structure for generating a bias magnetic field through a ferrite layer of the circulator, the first magnet structure comprising a first magnet and a second magnet stacked in an up-down manner, and the edge of the second magnet protruding from the edge of the first magnet; a second magnet structure arranged opposite to the first magnet structure for forming a closed magnetic circuit of the bias magnetic field; when the magnetic circuit structure is arranged in the circulator, the first magnet structure and the second magnet structure are arranged on two sides of the ferrite layer, and the first bias magnetic field and the second bias magnetic field are respectively established in the first ferrite and the second ferrite adjacent to the ferrite layer, the magnetic field strength of the first bias magnetic field is greater than that of the second bias magnetic field; the position of the first magnet corresponds to the position of the first ferrite, and the position of the second magnet corresponds to the position of the second ferrite. The application has the effect of improving the magnetization uniformity of the composite ferrite circulator.

The utility model discloses a backlight module integrated with an NFC function. A black adhesive layer, a gap layer, an upper brightness enhancement film, a lower brightness enhancement film, a diffusion film, a light guide plate, a double-sided adhesive layer, a reflecting film, an NFC antenna layer and a backlight adhesive frame used for supporting and fixing the components are sequentially stacked from top to bottom. The NFC antenna layer comprises an NFC FPC (Flexible Printed Circuit) layer and a ferrite layer, the NFC antenna part is responsible for realizing a near field communication function, and the ferrite layer is used for shielding electromagnetic interference and ensuring the stability of the NFC function. Compared with the prior art, the NFC function is directly integrated into the backlight module, the space for independently arranging the NFC module is saved, the number of material assemblies is reduced, and therefore the product thickness is reduced. After the backlight module is assembled with an electronic product, the wearable electronic product is more compact, light and thin. And secondly, the combination of the backlight module and the NFC function realizes the high integration of functional modules, reduces material components, simplifies the assembly and production flow, reduces the manufacturing cost, and simplifies the production process.

The invention relates to a charging device (28) for the inductive charging of electric vehicles (4), said device being is equipped with a power electronics unit (2) and a ground coil unit (1) connected to the power electronics unit (2). The power electronics unit (2) is designed to convert a supply voltage into an alternating voltage for inductive charging and to output the alternating voltage to the ground coil unit (1). The ground coil unit (1) has a flat coil (8) arranged in a main extension plane (6), a rear plate (10) which is at least approximately parallel to the flat coil (8) and is made of a non-magnetic material, a ferrite layer (9) arranged between the flat coil (8) and the rear plate (10), and a housing (11). The flat coil (8), the ferrite layer (9) and the rear plate (10) are arranged in the housing (11). A distance between the flat coil (8) and a top side of the housing (11) is smaller than a distance between the ferrite layer (9) and the housing top side. Furthermore, an actuator (13) is provided, which is also arranged in the housing (11) and is designed to move at least the flat coil (8) and the ferrite layer (9) along a displacement path (12) parallel to a surface normal of the main extension plane (6). According to the invention, the charging device (28) also comprises a control unit (26) which is designed to receive an overlap measure from the electric vehicle (4), to compare the received overlap measure with a predefined lower threshold and a predefined upper threshold, and to control the actuator (13) to move at least the flat coil (8) and the ferrite layer (9) towards the housing top side if the overlap measure falls below the lower threshold value, and to control the actuator (13) to move at least the flat coil (8) and the ferrite layer (9) away from the housing top side if the overlap measure exceeds the upper threshold value.

A cold-rolled and heat-treated steel sheet comprising 0.15% < = carbon < = 0.25%, 2.2% < = manganese < = 3%, 1.1% < = silicon < = 2%, 0% < = aluminum < = 0.09%, 0.05% < = molybdenum < = 0.5%, 0.001% < = titanium < = 0.06%, 0.001% < = boron < = 0.010%, 0% < = phosphorus < = 0.02%, 0% < = sulfur < = 0.03%, 0% < = nitrogen < = 0.09%, 0% < = chromium < = 1%, 0% < = copper < = 2%, 0% < = niobium < = 0.06%, 0% < = vanadium < = 0.1%, 0% < = calcium < = 0.005%, 0% < = magnesium < = 0.05%, the present invention relates to a steel sheet having a core microstructure comprising, in area fraction, 15% to 70% of bainite, 15% to 70% of partition martensite, 10% to 30% of ferrite, 9% to 22% of retained austenite in bainite and partition martensite, and 0% to 5% of fresh martensite, 0% < = zirconium < = 0.05%, 0% < = cerium < = 0.1%, and the remainder comprising iron and unavoidable impurities, the steel sheet having a core microstructure comprising, in area fraction, 15% to 70% of bainite, 15% to 70% of partition martensite, 10% to 30% of ferrite, 9% to 22% of retained austenite in bainite and partition martensite, and 0% to 5% of fresh martensite, and a ferrite-rich layer extending up to 90 microns from both surfaces of the steel sheet, such a ferrite-rich layer having two sub-layers wherein a first sub-layer adjacent to the surface of the steel sheet has an average ferrite percentage of 40% to 80% in area fraction, and a ferrite gradient ([delta] F) of 20% to 70%, [Delta] F is the difference between the ferrite content of the top of the first sub-layer and the ferrite content of the bottom of the second sub-layer, and the second sub-layer is the topmost layer of the ferrite-rich layer, having a ferrite percentage of 70% to 98% in area fraction and comprising internal oxides of manganese and silicon.

To provide a radiation shielding material that suppresses the generation of hydrogen sulfide during disposal and achieves both electromagnetic wave absorption and strength. [Solution] The radioactive shielding material comprises a main body layer containing cement and a first ferrite layer containing ferrite, which is laminated in the stacking direction relative to the main body layer, wherein the main body layer includes a first polymer layer containing polymer, and at least one of the main body layer and the first ferrite layer contains boron.

The application relates to a composite magnetic shielding structure, comprising: a metamaterial with near-zero magnetic permeability, the metamaterial comprising a substrate and a source coil assembly arranged on the substrate; a ferrite layer fixed to the surface of the metamaterial; and a metal layer fixed to the surface of the ferrite layer; wherein the ferrite layer and the metal layer form a Halbach-like magnetic circuit under the current excitation of the source coil assembly. The composite magnetic shielding structure solves the problem of transmission of the normal incidence wave, and has smaller eddy current heat effect, smaller mass and volume of the shielding body under the premise of ensuring higher shielding effectiveness.

This invention belongs to the field of surface thermal protection coating technology, and relates to a thermal barrier / high emissivity dual ceramic coating with adjustable thickness and its preparation method. The coating has a multi-layered structure, comprising, from the inside out, a metal bonding layer, a thermal barrier ceramic layer, and a high emissivity layer. The metal bonding layer is a NiCrAlY alloy bonding layer or a CoNiCrAlY alloy bonding layer. The ceramic layer is a multi-principal rare earth zirconate (RE2Zr2O7, RE=La / Nd / Sm / Eu / Gd) ceramic layer with low thermal conductivity. The high emissivity layer is a Sr-doped lanthanum ferrite layer. The dual ceramic coating of this invention has a gradient structure design, which can effectively alleviate the thermal mismatch stress caused by the difference in thermal expansion coefficients between the materials in each layer. Combining the high emissivity material, the low thermal conductivity material, and the metal bonding layer can reduce the heat conduction of high-temperature airflow to the substrate while enhancing the thermal radiation of the coating surface, greatly reducing the thermal load on the substrate.

An RF circulator includes a ferrite layer, a non-magnetic spacer, and a non-conductive preform layer disposed between the ferrite layer and the spacer, where the non-conductive preform includes spherical glass particles disposed within an epoxy.

The utility model discloses a magnetic core for direct current detection, which relates to the technical field of mutual inductors, and comprises a semi-circular magnetic core I and a semi-circular magnetic core II, two butt joint surfaces of the semi-circular magnetic core I and the semi-circular magnetic core II are respectively provided with an air gap; an insulating spacer is arranged at the air gap position of the butt joint surface of the semicircular magnetic core I and the semicircular magnetic core II to fill the air gap; each of the first semicircular magnetic core and the second semicircular magnetic core is of a multi-layer composite structure, each of the first semicircular magnetic core and the second semicircular magnetic core is of a laminated composite structure with a nanocrystalline layer and a ferrite layer arranged in a staggered mode, and an insulating layer is arranged between laminated layers of the nanocrystalline layer and the ferrite layer. The multi-layer composite structure of the first semicircular magnetic core and the second semicircular magnetic core solves the problem of material performance limitation, the air gap is formed between the first semicircular magnetic core and the second semicircular magnetic core to solve the problem of magnetic circuit nonlinearity, the precision and reliability of the mutual inductor can be remarkably improved through combination of the first semicircular magnetic core and the second semicircular magnetic core, and new market requirements are met.