276 results about "Magnetic alloy" patented technology

The invention discloses a magnetic adjustment water lubricated bearing and a bearing support control method, which are applied to a large ship propulsion shaft system, and comprise a bearing shell, an electromagnetic excitation module, a batten, a sensor module, a power supply driving module and a control system, a plurality of mounting grooves are formed in the bearing shell; an electromagnetic excitation module is arranged in each mounting groove and generates a variable magnetic field with set intensity; a plurality of magnetically soft alloy segments are arranged on the batten, the magnetically soft alloy segments correspond to the electromagnetic excitation modules one to one, and a magnetic field acts on the magnetically soft alloy segments to generate electromagnetic attraction force; the control system independently controls the excitation current of each electromagnetic excitation module according to data of the sensor module, and generates magnetic fields with different intensities to act on soft magnetic alloy areas at corresponding positions, so that precise control of local supporting rigidity and lubricating gaps of the water-lubricated bearing is realized, unbalance loading and abnormal wear risks are effectively reduced, and the service life of the water-lubricated bearing is prolonged. And the adaptive capacity of the bearing under low-speed heavy load and dynamic disturbance is improved.

The invention relates to a sunken porous magnetic alloy ball wave-absorbing material and a preparation method and application thereof.The wave-absorbing material is prepared through the following steps that S1, citric acid, soluble ferric salt, soluble cobalt salt and soluble nickel salt are dissolved in a mixed solvent of ethylene glycol and water, and the mixture is fully stirred to form a uniform mixed solution; and S2, the mixed solution obtained in the step S1 is subjected to spray drying, obtained precursor powder is placed in the air atmosphere to be calcined to remove the carbon source, then the precursor powder is placed in the H2 / Ar atmosphere to be subjected to heating reduction, and the porous FeCoNi alloy balls with the surface pits are obtained and are the target product. The surface of the prepared alloy microsphere has an obvious concave structure, magnetic anisotropy and magnetic performance are enhanced, a small number of pores are generated in the reduction process, impedance matching of the material is optimized, and effective high-frequency electromagnetic absorption is achieved; and due to the synergistic effect of the recesses and the pores, the obtained alloy microspheres have obvious lightweight characteristic, and have good application prospects in the field of electromagnetic absorption.

The invention discloses a magnesium-based solid hydrogen storage tank integrated with a resistance heating and electromagnetic coupling magnetic field structure, which comprises a tank body and a control cabinet integrated on the outer side wall of the tank body, a plurality of electrode plates are arranged in the tank body, and the electrode plates are electrically connected with a power supply cabinet on the side wall of the tank body through tabs on the electrode plates. The inner space of the tank body is divided into a plurality of hydrogen storage spaces by the plurality of electrode plates, magnesium-based solid hydrogen storage materials containing magnetic alloy metal and carbon materials are added into the hydrogen storage spaces through material adding ports formed in the outer side wall of the tank body, a temperature sensor is arranged in each hydrogen storage space, and a pressure sensor is arranged at the top of the tank body; a hydrogen inlet / outlet is formed in the top end of the tank body; a communicating hole for communicating two adjacent hydrogen storage spaces is formed in the center of the electrode plate. Through the synergistic effect of an electric field and a magnetic field, the thermal management performance of the magnesium-based hydrogen storage material is effectively improved, the hydrogen desorption cold start time is shortened, the thermal effect influence in the hydrogen charging and desorption process is reduced, stress concentration caused by volume expansion is relieved, and the hydrogen storage and release performance of the magnesium-based material is improved.

The invention relates to the technical field of soft magnetic ferrite materials, in particular to a preparation method of a high-permeability soft magnetic ferrite core material, which comprises the following steps: firstly, preparing FeSiCrBCu soft magnetic alloy powder with uniform components and controllable particle size through a single-roller quenching and hydrogen decrepitation process, and laying a structural foundation for excellent magnetic performance; and then a mechanical stirring-ultrasonic synergistic coating technology is utilized, so that the ferrite precursor uniformly coats the alloy powder, an effective core-shell structure is formed, and solid-phase reaction and crystal grain uniform growth during sintering are promoted. Besides, a multi-task deep learning model (MTL-DL) based on transfer learning is adopted to carry out multi-objective collaborative optimization on the sintering process, accurately match and dynamically adjust key parameters, and accurately regulate and control the material densification process, the grain size and the phase distribution on the microcosmic level, so that the problem that the microstructure and component uniformity are difficult to accurately control in the prior art is solved; therefore, the problems of poor material performance and high power loss are solved.

The invention provides amorphous nanocrystalline soft magnetic alloy powder, a preparation method thereof and a magnetic powder core, and relates to the technical field of soft magnetic materials. According to the preparation method of the amorphous nanocrystalline soft magnetic alloy powder, a high-energy electric pulse technology is adopted, an amorphous alloy material is instantly and rapidly heated and exploded, the particle size of the powder is accurately regulated and controlled by accurately regulating and controlling an energy input parameter and a spacing parameter, and the high-sphericity soft magnetic powder with the median particle size being 0.5-5 microns is prepared; the uniformity and dispersity of the powder are remarkably improved, and the problem of low particle size control precision in the prior art is solved. The preparation method is simple in technological process and low in energy consumption, impurities and defects introduced in a traditional multi-step technology are avoided, and the purity and performance of the material are improved. The prepared amorphous nanocrystalline soft magnetic alloy powder has the characteristics of small particle size, high sphericity, high saturation magnetization, low coercive force and high yield, and is particularly suitable for the fields of high-frequency magnetic elements and precision electronic devices.

The invention discloses a low-coercivity magnetically soft alloy and a preparation method thereof, belongs to the technical field of magnetically soft alloys, and solves the problem of poor coercivity and strength matching in the prior art. The low-coercivity magnetically soft alloy comprises the following components in percentage by mass: less than or equal to 0.01% of C, 0.50-2.00% of Si, less than or equal to 0.50% of Mn, 0.30-0.80% of Al, 12.00-15.00% of Cr, less than or equal to 0.001% of S, less than or equal to 0.001% of P and the balance of Fe and other inevitable impurities. The low-coercivity magnetically soft alloy is low in coercivity and high in strength.

The invention belongs to the technical field of magnetic shielding materials, and particularly relates to a nanocrystalline slotting and soft magnetic alloy powder filling composite magnetic sheet and a preparation method thereof. The composite magnetic sheet comprises a magnetic material layer formed by alternately compounding a nanocrystalline material layer and a double-faced adhesive tape, the magnetic material layer is provided with regularly distributed slotting structures, and the slotting structures are filled with soft magnetic alloy powder. The preparation method comprises the following steps: alternately compounding a nanocrystalline material layer and a double-faced adhesive tape to form a magnetic material layer, and performing die cutting to form a regularly distributed slotting structure; or the nanocrystalline material composite layer is subjected to die cutting to form a regularly-distributed through slotting structure, and then the structure is compounded with the composite layer which is not slotted to obtain the magnetic material layer; and then filling and fixing the slotting structure by adopting soft magnetic alloy powder to obtain the composite magnetic sheet. According to the invention, the defect of easy magnetic saturation due to local lack of magnetic materials after slotting can be avoided, and the obtained composite magnetic sheet has low loss and high saturation current at the same time.

This invention proposes a metal soft magnetic powder core with excellent low-frequency magnetic properties and its preparation method, belonging to the field of magnetic materials. Using at least nano-boron powder and iron-silicon soft magnetic alloy powder as raw materials, high-temperature diffusion and high-temperature nitriding treatments are employed. Part of the nano-boron powder forms a high-resistivity iron-silicon-boron permeation layer on the surface of the iron-silicon soft magnetic alloy powder, while some nano-boron powder forms a boron nitride insulating layer with both high resistivity and high thermal stability between the iron-silicon soft magnetic alloy powders, effectively controlling eddy currents. Hot pressing further increases the density of the metal soft magnetic powder core, reduces the demagnetizing field, thereby improving permeability and reducing hysteresis loss. Thus, excellent low-frequency magnetic properties of high density, high permeability, and low loss are simultaneously obtained in the metal soft magnetic powder core.

A soft magnetic alloy particle including Fe and Si. One to twenty nitride phases are observed in a cross-section of the soft magnetic alloy particle, an area per each of the nitride phases is within a range of 0.0005 to 10 μm2, and an area ratio of the observed nitride phases occupying the cross-section of the soft magnetic alloy particle is within a range of 0.1 to 2%.

The present invention relates to a soft magnetic alloy including, in terms of at %: 0.9%<M≤10%, M being at least one element selected from the group consisting of Cr, Mn, Ni, and Co; 7.0%≤Si≤20%; 5.0%≤B≤10%; 2.5%≤Nb≤5.0%; 0.5%≤Cu≤2.0%, with the balance being Fe and unavoidable impurities, in which the soft magnetic alloy satisfies −3.0%<(2[Co]+1[Ni])−(1[Cr]+2[Mn])<3.0%, in which [Co], [Ni], [Cr], and [Mn] respectively represents contents of Co, Ni, Cr, and Mn.

The invention provides a high-strength plastic corrosion-resistant soft magnetic high-entropy alloy and a preparation method and application thereof, the general formula of the high-strength plastic corrosion-resistant soft magnetic high-entropy alloy is FeaCobNicCrdTaeAlf, 30% < = a < = 45%, 15% < = b < = 35%, 10% < = c < = 20%, 5% < = d < = 20%, 0% < = e < = 4%, 0% < = f < = 5%, a + b + c + d + e + f = 100%, and a, b, c, d, e and f are molar percentages of corresponding elements respectively. The high-strength plastic corrosion-resistant soft magnetic high-entropy alloy has excellent mechanical properties and soft magnetic properties, and also has good corrosion resistance. The comprehensive performance of the high-strength plastic corrosion-resistant soft magnetic high-entropy alloy far exceeds that of most of traditional soft magnetic alloys, and the high-strength plastic corrosion-resistant soft magnetic high-entropy alloy has wide application prospects in the field of magnetic materials under extreme service conditions.

The invention relates to the technical field of nuclear facility pipeline heating. The invention provides a pipeline heating device and an in-reactor test facility. The pipeline heating device comprises a magnetic conduction layer, a heat conduction layer, a heat preservation layer and an electromagnetic induction coil, the magnetic conduction layer is made of a magnetic alloy material, and the magnetic conduction layer is enclosed and internally forms a heating area used for containing a pipeline; the heat conduction layer is located on the side, facing the heating area, of the magnetic conduction layer and used for transmitting heat of the magnetic conduction layer to the pipeline. The heat preservation layer wraps the side, away from the heating area, of the magnetic conduction layer. The electromagnetic induction coil is wound around the side, away from the heating area, of the heat preservation layer. The magnetic conductive layer made of the magnetic alloy material serves as a main absorption and conversion carrier of magnetic field energy, the eddy current effect can be remarkably enhanced, the problem that the heating efficiency is insufficient due to low magnetic conductivity of the austenitic stainless steel pipeline is solved, and the heating efficiency is greatly improved. The arrangement of the magnetic conductive layer can fundamentally avoid material microscopic damage caused by direct action of a magnetic field, and the safety is higher.

A dust core according to the present invention is characterized by comprising a granulated powder in which 2.0 to 4.0 mass% of a binder containing an acrylic resin as a main component is added to a magnetic alloy powder. The pH (hydrogen ion index) of the binder is preferably 6.0 to 8.0. The glass transition point of the binder is preferably from -5°C to lower than 25°C. The magnetic alloy powder is preferably any one of sendust powder, an amorphous alloy powder, or a nanocrystalline alloy powder.

The invention belongs to the technical field of soft magnetic materials and transformers, and particularly relates to a high-frequency transformer iron core for SST based on nanocrystalline soft magnetic alloy and a preparation method of the high-frequency transformer iron core. The preparation method comprises the following steps: carrying out roll-to-roll tension annealing treatment on a nanocrystalline strip, and then coating the surface of the nanocrystalline strip with a sol-gel insulating coating; or firstly coating the surface of the nanocrystalline strip with a sol-gel insulating coating, and then carrying out roll-to-roll tension annealing treatment to obtain the nanocrystalline strip subjected to annealing and insulating treatment; and winding the treated nanocrystalline strip into an iron core of a closed magnetic circuit, and dipping and curing to obtain the high-frequency transformer iron core for the SST. The transformer iron core is formed by winding, bonding and curing the nanocrystalline strip, interlayer insulation and enhanced stability of the nanocrystalline strip are achieved through cooperation of coating of the sol-gel insulation coating on the surface of the nanocrystalline strip and impregnation curing, high-frequency loss of the iron core can be remarkably reduced, and the transformer iron core has good performance stability.

The application relates to a low-loss iron-based nanocrystalline strip manufacturing method and belongs to the technical field of nanocrystalline soft magnetic alloy. The method comprises the following steps: S1, the nanocrystalline strip (1) is coated with an insulating glue solution on the nanocrystalline strip (1); S2, the insulating glue solution on the smooth surface of the nanocrystalline strip (1) is brushed off; S3, the nanocrystalline strip (1) is extruded to flatten the insulating layer (102) on the rough surface of the nanocrystalline strip (1); and S4, the nanocrystalline strip (1) is baked and solidified. The surface of the low-loss iron-based nanocrystalline strip is coated with an insulating layer, the interlayer insulation of the nanocrystalline magnetic core is improved, and the eddy current loss of the magnetic core can be effectively reduced.

The invention relates to the technical field of precise alloy materials, in particular to a high-permeability rare earth soft magnetic alloy plate for a magnetic shielding case and a preparation method of the high-permeability rare earth soft magnetic alloy plate. The alloy plate comprises the following main components in percentage by weight: 79 to 81 percent of Ni, 3.9 to 4.1 percent of Mo, 0.4 to 0.6 percent of Mn, 0.15 to 0.25 percent of Si, less than or equal to 0.02 percent of C, less than or equal to 0.015 percent of P, less than or equal to 0.008 percent of S, 0.035 to 0.055 percent of Ce and the balance of Fe and impurities. The preparation process comprises the steps of vacuum induction melting, electroslag remelting, homogenization treatment, forging, hot rolling, solution treatment, cold rolling, final heat-magnetic treatment and the like, and it is ensured that the material has excellent magnetic performance and machinability. By optimizing components and process parameters, especially adding a trace amount of Ce, the magnetic conductivity is effectively improved, the coercive force is reduced, and the magnetic shielding effectiveness and the temperature stability are improved.

To provide an iron-based soft magnetic alloy that possesses Bs≥1.7 T, exhibits low iron loss characteristics, and enables lamination core formation.SOLUTION: An iron-based soft magnetic alloy has a composition expressed by the formula (Fe1-mCom)100-x-ySix(B1-nCn)y, in which the composition ratios x, y, m, and n satisfy 1.0≤x≤3.0 atom%, 11.0≤y≤14.0 atom%, 0.05≤m≤0.5, and 0.0≤n≤0.3. The alloy has a metal structure composed of an α-Fe phase, with an amorphous phase of 20 vol.% or less, a saturation magnetic flux density of 1.7 T or more and 2.0 T or less, and an iron loss of 50 W / kg or less at a magnetic flux density of 1.5 T and a frequency of 1 kHz, wherein the thickness of the iron-based soft magnetic alloy is 18 μm or more and less than 40 μm.SELECTED DRAWING: Figure 2

The invention relates to a method and device for preparing rare earth magnetic alloy powder through gaseous calcium reduction. The method comprises the following steps: respectively placing rare earth magnetic alloy precursor powder and a calcium source in a first area and a second area of a vacuum container; and performing heat treatment to obtain the rare earth magnetic alloy powder. The first area and the second area of the vacuum container are separated by a porous partition plate or a net-shaped partition plate. According to the method, the precursor in the powder form is used as a raw material, the rare earth magnetic alloy precursor powder and the calcium source are placed in the first area and the second area which are spatially independent and allow gas circulation respectively, the rare earth magnetic alloy precursor powder is reduced through heat treatment and gaseous calcium, and the reduction efficiency and the utilization rate of the calcium source are remarkably improved; the residue of the calcium source on the surface of the rare earth magnetic alloy powder is reduced, and the waste of the calcium source is reduced.

The application belongs to the field of soft magnetic high-entropy alloy materials and magnetron sputtering technology, and particularly relates to a high-entropy soft magnetic film preparation method and film with high resistivity and cutoff frequency, which comprises the following steps: preparing a high-entropy alloy target and a zinc oxide target; selecting a non-magnetic material with high resistivity as a substrate; after cleaning the target and the substrate, performing double-target-position film magnetron sputtering on the target and the substrate by using the high-entropy alloy target and the zinc oxide target; the sample table is provided with multiple substrates, and the high-entropy soft magnetic alloy target and the ZnO target are arranged below; and the high-entropy soft magnetic film and the ZnO composition gradient-induced soft magnetic film are sputtered on the surface of the substrate. The application adopts composition gradient sputtering ZnO to control the film performance, further improves the resistivity, and obtains the high-entropy soft magnetic film with higher cutoff frequency under the action of strong inverse magnetic electric coupling and the large stress-induced Hk.

The present application relates to the field of high-frequency microwave absorbing material and technology, disclose a kind of multifunctional electromagnetic material with high-frequency electromagnetic absorption and corrosion resistance characteristics and its preparation method and application, the multifunctional electromagnetic material is the core-shell structure with 10-100nm particle size, core is metal magnetic alloy component, shell layer is multilayer graphite carbon;It is obtained by carbonization treatment after dissolving and precipitating of metal salt, surfactant and organic ligand, the magnetic alloy component of core body in material and the graphite carbon matrix of shell layer form conductive network, conducive to the conduction loss caused by electron transition;Mutual hetero-interface is conducive to the interface polarization loss of electromagnetic wave.In addition, magnetic component provides strong magnetic loss, optimizes the impedance matching of wave-absorbing body, further enhances the attenuation ability to electromagnetic wave;And shell layer can effectively prevent the penetration and transmission of various corrosive media on the surface of target matrix, it is a kind of multifunctional electromagnetic material with high-frequency electromagnetic absorption and corrosion resistance characteristics.

This application relates to the field of heating device technology, specifically to a preheating tunnel furnace for armature spraying, comprising a feeding section, a gradient heating section, a heat preservation section, and a discharge section, as well as a conveying system and an intelligent control system running through each section; the gradient heating section is equipped with a composite heating system, including multiple sets of variable frequency electromagnetic induction coil heating modules and tunable mid-wave infrared heating modules arranged symmetrically in the upper and lower parts; the intelligent control system is used to adjust the electromagnetic induction working frequency of 10kHz-100kHz to control the skin depth of 0.1mm-0.5mm, and simultaneously adjust the mid-wave infrared emission wavelength of 2.0μm-4.0μm to control the penetration depth of 0.05mm-0.3mm, forming a controllable surface gradient temperature field in the thickness direction of the thin sheet-like soft magnetic alloy armature, so that the temperature of the coating bonding layer of 0.1mm-0.3mm on the armature surface reaches 220℃-260℃, and the internal substrate temperature below 0.3mm does not exceed 100℃. This invention achieves gradient preheating with high surface temperature and low internal temperature by combining heating and intelligent control of energy injection depth, thus ensuring coating adhesion while avoiding overheating of the substrate.

The invention discloses a preparation method of a composite material for an integrated inductor. The preparation method of the composite material comprises the following steps: (1) carrying out pre-sintering crystallization treatment on FeSiBCuNb powder; (2) metal soft magnetic alloy powder and the pre-sintered and crystallized nanocrystalline powder are mixed, and composite powder is obtained; (3) the composite powder is put into a passivation solution to be subjected to passivation treatment, and passivated composite powder is obtained; (4) mixing a silane coupling agent, the modified silicon resin and silica sol, adding acetone for dilution, and uniformly stirring to form a composite insulating agent; (5) adding the passivated and sieved composite powder into a composite insulating agent to obtain composite granulation powder; and (6) sieving the composite material granulation powder, and adding a release agent to obtain the composite material powder for the integrated inductor. According to the invention, the metal soft magnetic powder is mixed with the nanocrystalline powder subjected to pre-sintering crystallization treatment, so that the characteristics of high magnetic conductivity and high superposition of the metal soft magnetic powder are not influenced, and the problem of overhigh loss of the metal soft magnetic powder at high frequency is solved.

To provide a soft magnetic alloy powder having good saturation magnetization and a coercive force capable of reducing core loss while maintaining good permeability and DC superposition characteristics of a dust core including the soft magnetic alloy powder.SOLUTION: The soft magnetic alloy powder includes soft magnetic alloy particles. The soft magnetic alloy particles include Fe, Si, and P. The soft magnetic alloy particles are composed of a plurality of crystallites and a crystal grain boundary between a plurality of crystallites. The crystallites have a portion where Si is segregated and a portion where P is segregated.SELECTED DRAWING: Figure 1

This invention provides a TiC-based non-magnetic alloy, its preparation, and its application. The TiC-based non-magnetic alloy comprises, by weight percentage: Ni 25–40 wt%, Cr 5.5–8.6 wt%, Mo 2.5–4.0 wt%, C 0.8–1.3%, TiC 46–66 wt%, and other unavoidable trace impurities. The TiC-based non-magnetic alloy comprises TiC, Ni, Cr, Mo, and C, with appropriate proportions of each component, resulting in low magnetic properties, high hardness, high wear resistance, high-temperature performance, oxidation resistance, and corrosion resistance. Furthermore, the hard phase uses TiC, which has a low self-lubricating coefficient, and excludes WC. Therefore, the TiC-based non-magnetic alloy has a uniform grain size distribution, good internal stress consistency, and is less prone to cracking and deformation, extending its service life and demonstrating good product stability.

This application discloses a method (100) for preparing low-cobalt soft magnetic alloy strip, comprising: weighing raw materials (S102), which, by weight percentage, include: 3wt%-12wt% Co, 0.2wt%-0.8wt% Cr, 0.6wt%-2.5wt% Si, 0.03wt%-0.06wt% Nb, 0.2wt%-0.8wt% Mn, 0.01wt%-0.05wt% C, with the balance being Fe and unavoidable impurities; melting and casting the raw materials into an ingot to form a billet (S104); removing the oxide scale from the billet (S106); and further processing the raw materials. The billet after removing the oxide scale is heated (S108); the heated billet is rolled into a strip (S110); the strip is water-quenched and solution-treated to form a finished strip (S112); the finished strip is cold-rolled at least once until a set first thickness is reached (S114), wherein the total deformation is controlled at 50-65%; softening annealing is performed (S116); the finished strip of the first thickness is cold-rolled at least once again (S118) until a set second thickness is reached; the finished strip of the second thickness is heat-treated and annealed (S120) to obtain a set hardness value.

The invention relates to the technical field of magnetically soft alloy materials, discloses a preparation method of an iron-based nanocrystalline magnetically soft alloy, and aims to solve the problem that an existing iron-based nanocrystalline magnetically soft alloy is difficult to have high saturation flux density, low coercive force and good amorphous forming ability at the same time. The method comprises the following steps: performing isothermal overheating treatment on a melt formed by raw materials; then, non-equilibrium solidification is achieved through the ultra-high-speed rapid quenching technology, and therefore an amorphous initial strip is prepared; and finally, a nanocrystalline and amorphous double-phase composite alloy is formed through cooperative controlled nanocrystalline crystallization annealing treatment, so that the soft magnetic performance is remarkably improved.

The invention belongs to the technical field of aviation machining, and discloses a numerical control machining method for a magnetically soft alloy large-length-diameter-ratio thin-wall rotary workpiece, which comprises the following steps of: clamping the outer circle of the workpiece, penetrating a mandrel through an inner hole, and carrying out rough machining and finish machining on the outer circle at one end of the workpiece; turning around, clamping the outer circle of the workpiece, enabling an inner hole to penetrate through a mandrel, and performing rough machining and finish machining on the outer circle of the other end of the workpiece; the outer circle of the workpiece is clamped, the end face of the workpiece is flattened, an inner hole is bored, and back gouging is conducted on the root of the hole; and turning around, clamping the outer circle of the workpiece, flattening the end face of the workpiece, and turning and adjusting a threaded hole. The problem that in the existing thin-wall part machining process, wall thickness uniformity and consistency control are poor is solved, the machining efficiency is high, and the machining quality is stable and reliable.

The invention discloses a small frameless optical fiber ring assembly capable of reducing stress and a preparation method thereof, and solves the problems that extra stress is generated in the fixing process of a frameless optical fiber ring and a support, and the size is increased after a magnetic shielding outer cover is additionally arranged. The invention discloses a small frameless optical fiber ring assembly capable of reducing stress. The small frameless optical fiber ring assembly comprises an optical fiber ring support made of a soft magnetic alloy material, an annular cover plate and a frameless optical fiber ring, the optical fiber ring support is of an integrally-formed circular-ring-shaped structure with an opening in one end, and a containing cavity is defined by a bottom wall, a first vertical wall and a second vertical wall. The first vertical wall is provided with a fiber outlet hole, the second vertical wall is provided with a circular mounting table, the mounting table is provided with a mounting hole, and the bottom wall is provided with a groove used for accommodating an optical fiber ring exchange layer; the open end of the optical fiber ring bracket is connected with a cover plate; and the frameless optical fiber ring is arranged in the accommodating chamber, is matched with the bottom wall and then is adhered to the bottom wall, and the other wall surfaces are in clearance fit with the inner wall surface of the optical fiber ring bracket and the cover plate.

The present invention provides a soft magnetic alloy powder capable of realizing use of electronic devices in a high-temperature environment. The present invention can obtain a soft magnetic alloy powder containing Si: 1.2 to 8% by weight, Cr: 0 to 9% by weight, and Al: 0.75 to 1.25% by weight, with the remainder being Fe and inevitable impurities, having a negative magnetic core loss temperature characteristic within 25°C to 150°C.

A compound contains a first soft magnetic powder, a second soft magnetic powder, and a resin composition. The resin composition contains a thermosetting resin. The particle diameter of the first soft magnetic powder is greater than the particle diameter of the second soft magnetic powder. First soft magnetic particles composing the first soft magnetic powder include a metal portion, and an insulating coating film directly covering the metal portion. At least a part of the metal portion is a soft magnetic alloy containing Fe, Cr, and Si. The insulating coating film contains SiO2. The content of Fe2O3 is 0% by atom or more and 10% by atom or less in a surface region of the first soft magnetic particles where a depth from the outermost surface of the first soft magnetic particles is 100 nm or less.