398 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 provides an iron-based magnetically soft alloy strip and a preparation method and application thereof, the alloy composition of the iron-based magnetically soft alloy strip is FeaCobCrcSidBeWfAlgGehRei (MxNy) j, 75 < = a < = 81, 5 < = b < = 11.9, 5 < = c < = 10, 2 < = d < = 4, 2 < = e < = 4, 2 < = f < = 4, 1 < = g < = 3, 0.5 < = h < = 2, 0.5 < = i < = 1.5, 0.1 < = j < = 1, x: y = 1, and a + b + c + d + e + f + g + h + i + j = 100; m is Ti and / or Zr, and N is nitrogen; wherein the nitride material has an iron-based grain phase and a germanium-tungsten-containing precipitated phase, the nitride is distributed between the interfaces of the iron-based grain phase, and the average grain size of the iron-based grain phase is 5-20 nm. The iron-based magnetically soft alloy strip can be suitable for complex application scenes, and the magnetic performance and reliability of the iron-based magnetically soft alloy are 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 present invention relates to a synchrotron fast-response magnetic alloy high-frequency system, comprising: a control circuit for generating a waveform signal; a full-solid-state power source for receiving the waveform signal and performing power synthesis to generate a power signal; an impedance phase compensator for realizing impedance rise and fall and phase compensation; an impedance transformer for realizing impedance transformation to achieve impedance matching between the full-solid-state power source and the magnetic alloy-loaded resonant cavity; a magnetic alloy-loaded resonant cavity for receiving the power signal and generating a radio frequency signal to operate on the heavy ion beam; and a sampling circuit for sampling the radio frequency signal and feeding it back to the control circuit. The synchrotron fast-response magnetic alloy high-frequency system provided by the technical solution of the present invention has performance indicators of low frequency, high bandwidth, fast rising of voltage signal and response, and can output single-sine and half-sine waveforms, realizing the functions of capturing, accelerating and Barrier Bucket bunch accumulation for various heavy ion beams.

The present invention relates to a method for producing a soft magnetic alloy powder, a soft magnetic alloy powder, a powder magnetic core, a magnetic element, and an electronic device. Provided are a soft magnetic alloy powder having a low coercive force, a method for producing the soft magnetic alloy powder capable of stably producing the soft magnetic alloy powder, a powder magnetic core containing the soft magnetic alloy powder, a magnetic element provided with the powder magnetic core, and an electronic device provided with the magnetic element. A method for producing a soft magnetic alloy powder, said soft magnetic alloy powder being produced from FexCuaNbb (Si1-y (B1-zCrz) y) 100-x-a-b [wherein 0.3 < = a < = 2.0, 2.0 < = b < = 4.0, 75.5 < = x < = 79.5, 0.55 < = y < = 0.91, and 0.015 < = z < = 0.185 are satisfied. A step for producing an amorphous alloy powder having an average particle diameter of 10.0 [mu] m or more and 45.0 [mu] m or less; and a step for producing the soft magnetic alloy powder by heating at a temperature of 420 DEG C to 620 DEG C. The crystal grain size measured by X-ray diffraction is 5.0 nm to 20.0 nm, and the volume resistivity of the compact is 9.0 * 10 <-3 > [Omega * cm] or less.

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 a nanocrystalline soft magnetic alloy with high magnetic conductivity, a strip and a preparation method and application of the nanocrystalline soft magnetic alloy. The chemical formula of the nanocrystalline soft magnetic alloy with the high magnetic conductivity is FeaCobNicTidSihBfRjMk (NbO) x, wherein R is a rare earth element and is selected from at least one of La, Nd and Y; m is a transition metal element and is selected from at least one of Zr and Hf; a, b, c, d, h, f, j and k are atomic percentages of the corresponding components: 72 < = a < = 85, 2 < = b < = 5, 3 < = c < = 8, 1 < = d < = 2, 2 < = h < = 4, 2 < = f < = 4, 0.5 < = j < = 1, 0.5 < = k < = 2, 0.5 < = x < = 2, and the sum of the atomic percentages of all the components is 100. The nanocrystalline soft magnetic alloy disclosed by the invention has high magnetic conductivity, low loss and excellent mechanical property and thermal stability.

The present invention provides an iron-based nanocrystalline soft magnetic alloy powder, a soft magnetic composite material and a preparation method thereof, belonging to the technical field of soft magnetic materials. The iron-based nanocrystalline soft magnetic alloy powder has a heterogeneous nanocrystalline structure comprising a three-dimensional island-shaped amorphous region and a nanocrystalline region. The diameter of the three-dimensional island-shaped amorphous region is 50-100 nm, and the number density of the three-dimensional island-shaped amorphous region is 10 19 ‑10 20 m ‑3 The iron-based nanocrystalline soft magnetic alloy powder has the advantages of high sphericity, high saturation magnetization and low coercive force; the soft magnetic composite material comprises soft magnetic powder and a coating layer coated on the surface of the soft magnetic powder, and the coating layer comprises a binder, wherein the soft magnetic powder is the iron-based nanocrystalline soft magnetic alloy powder provided by the present invention, or is composited with at least one of iron-nickel, iron-nickel-molybdenum, iron-silicon, iron-silicon-aluminum, iron-silicon-chromium, carbonyl iron and pure iron powder, and has the advantages of low high-frequency loss, high magnetic permeability and high DC bias.

The invention provides a magnetically soft alloy-based wave-absorbing composite material as well as a preparation method and application thereof, and belongs to the technical field of electromagnetic wave absorbing materials. The wave-absorbing composite material provided by the invention comprises various magnetically soft alloy substrates prepared from elements such as iron, cobalt, nickel and the like and nitrogen-doped carbon coating the surfaces of the magnetically soft alloy substrates. The coercive force of the soft magnetic alloy is relatively low, so that the magnetic domain wall movement and magnetic moment rotation resistance in the material are reduced, the magnetic conductivity is relatively high, and the nitrogen-doped carbon with high dielectricity is combined to construct a magnetic-dielectric structure, so that the impedance matching between the composite material and the space is improved, and the efficient absorption of electromagnetic waves is promoted. The magnetically soft alloy-based wave-absorbing composite material has the characteristics of strong electromagnetic wave absorption performance and wide absorption frequency band, and is simple in preparation technology and easy for large-scale production.

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 relates to a high-strength FeCo-V-Nb magnetically soft alloy and a heat treatment method. The invention belongs to the field of magnetically soft alloy materials. The high-strength magnetically soft alloy comprises the following components in percentage by weight: 40-60% of Fe; 40%-60% of Co; 1 to 3 percent of V; and 0.01 to 1% of Nb. And smelting, casting, hot rolling and cold rolling are carried out to finally obtain the thin strip with the thickness of 0.25-0.45 mm. The invention provides a heat treatment method of a high-strength FeCo-V-Nb magnetically soft alloy. The heat treatment method comprises the following steps: carrying out heat treatment at 700-900 DEG C under an anti-oxidation condition, and cooling through water quenching. The invention aims to solve the problem that the existing iron-cobalt magnetically soft alloy cannot obtain relatively high magnetic property and mechanical property at the same time, so that the mechanical property and the magnetic property of the iron-cobalt magnetically soft alloy under the conditions of room temperature and high temperature are remarkably improved.

The invention relates to an iron-nickel magnetically soft alloy, in particular to an iron-nickel magnetically soft alloy with high magnetic conductivity and high magnetic induction and a preparation method of the iron-nickel magnetically soft alloy. The iron-nickel magnetically soft alloy comprises the following chemical components in percentage by mass: 48.00 to 51.00 percent of N , 0.10 to 0.30 percent of Mn, 2.50 to 5.00 percent of Cr, 1.00 to 1.50 percent of T , 0 to 0.30 percent of A < l >, less than 0.10 percent of S , less than 0.02 percent of C and the balance of Fe and inevitable impurities. The preparation method is realized based on the chemical components. On the basis of an existing 1J50 alloy, 2.50-5.00% of Cr, 1.00-1.50% of Ti and 0-0.30% of A are added, and the mechanical property, corrosion resistance and conductivity of the iron-nickel magnetically soft alloy can be improved on the premise that the magnetic property of the iron-nickel magnetically soft alloy is not affected.

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.

The invention discloses a design and preparation of a novel microwave absorbing material of a magnetic CoFe / C at bamboo-like carbon nanotube (CoFe / C at bamboo-like CNTs) core-shell nanocomposite. The material has a hollow core-shell structure, an inner core of the core-shell structure is made of CoFe magnetic alloy, and an outer shell layer of the core-shell structure is made of bamboo-like carbon nanotubes. The magnetic CoFe / C and bamboo-like CNTs core-shell nano composite microwave absorbing material disclosed by the invention shows excellent electromagnetic wave loss capability in a frequency range of 2.0 to 18.0 GHz. The preparation method comprises the following steps: uniformly mixing a metal-nitrilotriacetic acid chelate precursor with dicyandiamide according to a certain ratio, and annealing in argon, so as to prepare the magnetic CoFe / C bamboo-like CNTs core-shell nano composite microwave absorbing material with multiple components and rich heterogeneous interfaces.

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.

A soft magnetic alloy powder includes a main component of (Fe(1−(α+β))X1αX2β)(1−(a+b+c+d+e+f))MaBbPcSidCeSf, in which X1 is one or more of Co and Ni, X2 is one or more of Al, Mn, Ag, Zn, Sn, As, Sb, Cu, Cr, Bi, N, O, and rare earth elements, and M is one or more of Nb, Hf, Zr, Ta, Mo, W, Ti, and V. 0≤a≤0.160, 0.020≤b≤0.200, 0≤c≤0.150, 0≤d≤0.060, 0≤e≤0.030, 0.0010≤f≤0.030, 0.005≤f / b≤1.50, α≥0, β≥0, and 0≥α+β≥0.50 are satisfied.

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 provides a magnetic control relay and a control method thereof. In the electromagnetic driving system, an iron core is made of semi-hard magnetic alloy steel; the control power supply controls the excitation coil to flow through a forward pulse current through the integrated control circuit, a forward electromagnetic field is generated, the magnetic control relay sucks, the spring and the magnetized semi-hard magnetic alloy steel core, after the forward pulse current is stopped, residual magnetism generates a retention force to keep a sucks state, and the excitation coil does not need to be electrified for a long time; and reverse pulse current is controlled to flow through the magnet exciting coil, a reverse electromagnetic field is generated, the semi-hard magnetic alloy steel core is demagnetized, the magnetic force disappears, and the magnetic control relay is released under the action of the spring. Besides the suction action output, the integrated control circuit only consumes a small amount of power, and the overall suction power consumption of the magnetic control relay is close to zero, so that the magnetic control relay has a good energy-saving effect.

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.