91 results about "Curie temperature" patented technology

The invention discloses a neodymium-iron-boron rare earth permanent magnet, a preparation method and use thereof. The neodymium-iron-boron rare earth permanent magnet comprises: R: 28.5-33 wt %, wherein RL comprises Pr, Pr≥14 wt %, and RH comprises one or more of Dy, Tb, Gd and Ho; Co: 12-20 wt %; Al: 0.5-1.5 wt %; X: 0.3-1.5 wt %; B: 0.88-1.05 wt %; and a balance of Fe, the microstructure thereof comprises a main phase M, a grain boundary phase A and a grain boundary phase B; the main phase M is R2(Fe, Co)14B having a volume percentage of 90-94%; the grain boundary phase A is R(Fe, Co)2 having a volume percentage of 5-8%; and the grain boundary phase B is R4(Fe, Co)3 having a volume percentage of 1-2%. The neodymium-iron-boron rare earth permanent magnet has a high Co content, a high Curie temperature, a low temperature coefficient, good mechanical properties, a high magnetic energy product and a high coercive force.

The application relates to a nickel-zinc-copper ferrite and a preparation method and application thereof, the nickel-zinc-copper ferrite comprising main components and auxiliary components; the main components comprise Fe2O3 64-66.7 mol%, NiO 9-12 mol%, ZnO 13.5-19 mol% and CuO 3-9.5 mol% with the total mole percentage being 100 mol%; the auxiliary components comprise Bi2O3 0.3-1.5 wt%, Co2O3 0.1-0.6 wt%, CaCO3 0.03-0.08 wt% and ZrO2 less than or equal to 0.1 wt% with the total mass percentage of the main components being taken as a standard. The content of Fe2O3, ZnO, NiO and CuO is controlled, the content of the auxiliary components is matched and adjusted, the prepared nickel-zinc-copper ferrite has high saturation magnetic induction intensity, high magnetic permeability, high Curie temperature, low residual magnetic induction intensity and low specific temperature coefficient, and can be better applied to power inductance or common-mode inductance.

The invention provides a hafnium-zirconium-oxygen film, a preparation method thereof and a hafnium-zirconium-oxygen film sensor, and belongs to the technical field of piezoelectric sensors, the hafnium-zirconium-oxygen film is prepared from a hafnium-zirconium-oxygen material, the chemical general formula of the hafnium-zirconium-oxygen material is Aly-HfxZr1-xO2, x is greater than or equal to 0.3 and less than or equal to 0.7, and y is greater than or equal to 0.02 and less than or equal to 0.08. The lead-free hafnium-based oxide is selected as a piezoelectric core, HfxZr1-xO2 is adopted as a matrix, Al is doped to stabilize an orthogonal ferroelectric phase and inhibit oxygen vacancy, d33 = 85-95 pC / N within the thickness range of 10-200 nm and reaches 90% of that of an existing PZT film, and the Curie temperature is increased to 600 DEG C and is greatly increased compared with 350 DEG C of the PZT film. And the material is completely free of lead and conforms to the RoHS instruction.

This invention provides an organic ferroelectric eutectic material, its preparation method, and its applications, relating to the field of ferroelectric materials technology. The organic ferroelectric eutectic material constructs a crystal system with "rigid constraint and flexible adaptation coexisting, dipole order and controllable polarization synchronously" through "molecular selection-supramolecular assembly-crystal structure regulation," achieving a synergistic effect of high Curie temperature, strong polarization characteristics, and excellent flexibility. The preparation method of the organic ferroelectric eutectic material utilizes a simplified "solvent dissolution-solvent evaporation" process, leveraging the mediating effect of the solvent to promote the supramolecular self-assembly of donor and acceptor molecules. This achieves the preparation of an organic ferroelectric eutectic material possessing both high Curie temperature, strong polarization characteristics, and excellent flexibility. The preparation method has multiple advantages, including "stable process, low cost, and suitability for large-area processing," making it a simple, efficient, and universally applicable preparation method suitable for large-scale industrial production.

The application provides an amorphous alloy magnetocaloric performance prediction method and system based on interpretable machine learning, relates to the technical field of material science and engineering, and comprises the following steps: step 1, constructing an amorphous alloy magnetocaloric performance data set, wherein the data set comprises alloy composition data, physical and chemical descriptors, external conditions and structural characteristics of a plurality of amorphous alloy samples and corresponding experimental values of maximum magnetic entropy change and Curie temperature; step 2, screening and optimizing the features in the data set, eliminating the collinearity between the features and performing recursive feature elimination to determine the final feature subsets for predicting the maximum magnetic entropy change and the Curie temperature respectively; and step 3, establishing machine learning models for predicting the maximum magnetic entropy change and the Curie temperature respectively through the final feature subsets, and training and optimizing the models to obtain the trained prediction models. The application realizes a closed loop of high-precision performance prediction, physical mechanism analysis and directional composition design.

Broadband high T c High-conductivity manganese-zinc ferrite and preparation method, belong to ferrite material preparation technical field. High specific surface area raw material is adopted, contact area of powder in ball milling process is increased, reaction activity is improved, and sintering temperature is reduced; MnZn ferrite main formula adopts iron-rich zinc-deficient system, superexchange interaction is enhanced, and material Curie temperature is realized; secondary ball milling introduces combined additives, sintering process grain growth mechanism is regulated by means of fluxing and crystal resistance dual effects, Co2O3 is used to compensate MnZn ferrite magnetic crystal anisotropy constant, and initial magnetic permeability is improved; CaSiO3 is introduced, and is enriched in grain boundary in the sintering process, grain boundary resistivity is improved, and magnetic permeability frequency characteristic is improved; in the sintering process, oxygen partial pressure is accurately controlled in the holding and cooling stages, Fe 2+ Ion generation amount is influenced, sample resistivity is improved, and suitable sintering temperature and holding time are beneficial to grain growth and material densification.

In an aspect of the present invention, a new active optic is provided, namely, a photo-magnetically actuated deformable mirror (PMADM) made of a magnetic composite structure and an optical quality substrate layer. The magnetic layer is composed of Polydimethylsiloxane (PDMS) and powdered ferromagnetic CrO2. A magnet may be used to deform the mirror surface. The powdered CrO2 has a low Curie temperature (preferably around 395 K) which allows changing the magnetization of the magnetic layer using a laser heating source, thus providing control over the deformation. In one embodiment, the structure has an overall dimension of 1.2 inch 1.2 inch 175 μm with an optical pupil diameter of 8 mm. The PMADM is estimated to deform to a maximum stroke of 8.7731 μm before failure with a 3 safety factor.

The embodiment of the application discloses high magnetic permeability manganese-zinc ferrite broadband material KAH150 material and a preparation method thereof, the material has the magnetic permeability ui in the range of 10000-15000+ / -25% under the condition of 10-200KHZ frequency; the Curie temperature Tc of the material is greater than 130 DEG C; the method comprises the following steps: obtaining raw materials according to the proportioning mode that Fe2O3 is 51.2-54.5mol%, ZnO is 19.1-22.40mol%, and the rest is MnO; the raw materials are sequentially subjected to ball milling, pre-sintering, secondary sand milling, spray granulation, blank preparation and sintering treatment, and the high magnetic permeability manganese-zinc ferrite broadband material KAH150 material is obtained. Through the combination adjustment of fixed formula and doping, the material magnetic permeability can still maintain ui >=10000 at 200KHZ, and the high-frequency performance is greatly improved.

The invention relates to a method for preparing a single-domain thin film of ferroelectric material, the method comprising transferring the layer from a donor substrate to a recipient substrate, followed by heat treatment (Stab) and then thinning (Thin), the heat treatment comprising: heating to a high temperature between 400°C and the Curie temperature of the ferroelectric material forming the layer; holding the temperature for a period exceeding 30 minutes; and then cooling, the heating comprising a ramp at a rate of temperature change greater than or equal to 7°C / min, such that the transferred ferroelectric layer reaches a temperature between 400°C and the Curie temperature at the end of the ramp. Figure 2

The application discloses a novel high-power thermomagnetic power generation device, which comprises a support, an induction coil, a first permanent magnet, a second permanent magnet, a fluid tank and a movement module; the support comprises a bottom plate, a top plate and support columns, the bottom plate is installed at the lower end of the support columns, and the top plate is installed at the upper end of the support columns; the induction coil is vertically arranged on the upper surface of the top plate; the first permanent magnet is vertically movably arranged in the induction coil; the second permanent magnet is arranged on the bottom plate; the fluid tank is arranged above the second permanent magnet; the movement module comprises a magnetic heat element and a driving assembly; the magnetic heat element is vertically movably arranged above the fluid tank, the upper end of the magnetic heat element is connected with the lower end of the first permanent magnet, the driving assembly is installed on the support, and the driving assembly is connected with the magnetic heat element and used for providing an upward driving force for the magnetic heat element; wherein the magnetic heat element is a magnetic heat material, and the fluid tank is provided with a hot fluid with a temperature higher than the Curie temperature of the magnetic heat element. The novel high-power thermomagnetic power generation device improves the output power of the thermomagnetic power generation device.

The application provides a wafer-level room-temperature monolayer magnetic semiconductor thin film and a preparation method thereof, and relates to the technical field of two-dimensional magnetic semiconductor material preparation.The present application is based on a three-temperature-zone low-pressure chemical vapor deposition system, and the wafer-level controllable preparation of a single-cell thickness spinel structure Fe2GaO4 thin film is realized through the following steps: the partitioned treatment of Te powder, metal precursors and sapphire substrates in three temperature zones, and the preparation method of sequentially blowing and replacing by inert carrier gas and hydrogen-argon mixed gas, segmented preheating and temperature rising, oxygen regulation and control and in-situ heat preservation annealing.Meanwhile, the prepared Fe2GaO4 thin film has a thickness of only 0.53 nm, a Curie temperature of more than 300 K, intrinsic ferromagnetism at room temperature, clear optical band gap and semiconductor characteristics, and can be widely applied to various new-type spin electronic devices.

The application belongs to the field of electronic information functional ceramic materials, and specifically provides a modified lead metaniobate piezoelectric ceramic material and a preparation method thereof, to solve the problems of insufficient competitiveness of piezoelectric performance of pure phase PbNb2O6 piezoelectric ceramic, difficulty in obtaining ferroelectric phase, and poor sintering performance, etc. 2x (Nb 2‑2x Zr x Ti x )O6, 0 < x ≤ 0.1, specifically a tetragonal tungsten bronze structure, ion substitution is performed at B sites, Zr 4+ and Ti 4+ are used to substitute Nb 5+ , and each occupies a half of the substitution amount; vacancy doping is performed at A sites, K + is selected to be doped into the A site gap between NbO6 oxygen octahedra (the original Pb 2+ is not substituted); in summary, through A site and B site cooperative doping of the tetragonal tungsten bronze structure lead metaniobate, the modified lead metaniobate ceramic has high piezoelectric performance and high Curie temperature at the same time, especially the d 33 value has obvious competitiveness in this system, and has great application potential in high-temperature sensors, transducers and the like.

The application discloses a kind of high-performance pure organic magnetic composite material and preparation method thereof, the composite material is poly (3-hexyl thiophene) as electron donor, using fullerene as electron acceptor, synthesis poly (3-hexyl thiophene) / fullerene composite charge transfer object.Then after 4" -n-pentyl-4-cyanotriphenyl subsequent doping, poly (3-hexyl thiophene) / fullerene / 4" -n-pentyl-4-cyanotriphenyl composite material.The method and material used in the application enhance the degree of charge transfer between pure organic composite material and solid state structure order, so that composite material obtains high room temperature ferromagnetism and Curie temperature, overcome the shortcoming that organic magnetic material is unstable in performance in air, low Curie temperature.Through poly (3-hexyl thiophene), fullerene and 4" -n-pentyl-4-cyanotriphenyl three composite, provide a kind of simple operation, solid state structure packing order, good stability high magnetic pure organic component composite material preparation new method.

This invention discloses a Cr-rich multiphase hexa-element non-noble metal high-entropy alloy and its preparation method, belonging to the field of magnetic high-entropy alloy technology. Preparation raw materials: Cr 65-70 at.%, Fe 1-5 at.%, Co 1-5 at.%, Ni 1-5 at.%, Al 10-15 at.%, and Mo 10-15 at.%, totaling 100 at.%. Preparation method: (1) Mix the raw materials evenly; (2) Continuously introduce argon gas; (3) Heat at a uniform rate, simultaneously increasing the argon gas flow rate, maintain at 1200℃ for 16 hours, and then reduce the argon gas flow rate; (4) Cool at a uniform rate, simultaneously increasing the argon gas flow rate, maintain at 900℃ for 10 hours, and then reduce the argon gas flow rate; (5) Cool at a uniform rate, maintaining the argon gas flow rate and rapidly cooling to room temperature, thus obtaining the alloy. This invention achieves a high Curie temperature Ti at low cost by combining a precise doping strategy of hexa-element non-noble metal elements with one-step heat treatment and a staged rapid cooling process. c With low saturation magnetization M s The coordinated regulation of these technologies effectively overcomes key bottlenecks such as high magnetic loss and poor magnetic stability in traditional magnetic materials, providing a material basis for the development of next-generation high-frequency and high-temperature magnetic devices.

The invention belongs to the technical field of magnetic materials, and provides a ferrite material, a preparation method thereof and a magnetic converter containing the same, the ferrite material comprises a main component and an additive component; the main component comprises the following components in parts by weight: 71.20 to 72.50 parts of Fe2O3, 2.00 to 4.80 parts of ZnO and 22.7 to 26.8 parts of Mn3O4, and the additive component comprises the following components in parts by weight: CaO, Li2O, CoO, CuO and Nb2O5. According to the present invention, the main components comprise the high Fe2O3 content and the low ZnO content, and the specific additive components are matched, such that the obtained ferrite material has characteristics of high Curie temperature and high saturation magnetic flux density, can have the low loss characteristic under the conditions of wide temperature range (25-120 DEG C) and high frequency (1-4 MHz), and can effectively support the high frequency and miniaturization development of the converter.

The utility model relates to the technical field of anti-explosion pressure release valves, and discloses an elastic force and magnetic force double-control type anti-explosion pressure release valve which comprises a body, a clamping spring is placed on the inner wall of the body, a limiting ring is detachably installed on the inner wall of the body, a guide rod is connected to the inner wall of the body in a clamped mode, and the limiting ring is detachably installed on the inner wall of the body. According to the elastic force and magnetic force double-control type anti-explosion pressure release valve, opening of the anti-explosion pressure release valve is controlled in a newly added magnetic force mode and an original elastic force control mode, the valve is opened when internal pressure reaches an elastic force control point, the piston is provided with a clamping structure to prevent the valve from being closed after the valve is opened, and when the elastic structure is clamped and cannot be opened, the valve is closed along with further increasing of the internal pressure. And when the temperature exceeds 310 DEG C and the Curie temperature of the magnetic material is exceeded, the piston on the valve can automatically fall off and be opened, the double-safety valve opening performance is achieved, two-stage pressure relief points are achieved, and the problem that an elastic structure is stuck can be solved.

This application relates to the technical field of soft magnetic material alloys, specifically to an alloy and its preparation method, a passive shutdown device, and a reactor. The alloy comprises: 60.0-75.0% Ni by weight, 0.1-0.5% Mn by weight, 0.01-0.1% Si by weight, less than 0.01% C by weight, with the balance being Fe. The alloy prepared using the composition provided in the embodiments of this application exhibits high Curie temperature control accuracy at high temperatures, and also possesses high permeability and low hysteresis loss. Its magnetic flux can change rapidly within a predetermined temperature range. Therefore, when applied to a passive shutdown device, the alloy can rapidly demagnetize above the predetermined temperature range, causing the control rods to fall into the reactor core, thus meeting the high sensitivity technical requirements of passive shutdown devices.

The invention discloses a rare earth doped perpendicular magnetic anisotropy oxide thin film and a preparation method thereof, and relates to the field of hard magnetic rare earth element doped oxide thin film materials, the rare earth doped perpendicular magnetic anisotropy oxide thin film has (001) plane crystal orientation and comprises a substrate and a thin film layer, the substrate is MgAl2O4 (001), and the thin film layer is LaxNi1-xCo2O4 (001). According to the rare earth doped perpendicular magnetic anisotropy oxide thin film and the preparation method thereof, lattice strain caused by mismatching of ion radius sizes can be overcome, lanthanum is doped into a crystal structure of spinel oxide NiCo2O4, a radio frequency magnetron sputtering preparation process is adopted, La0. 05Ni0. 95Co2O4 and La0. 1Ni0. 9Co2O4 target materials are adopted, and the rare earth doped perpendicular magnetic anisotropy oxide thin film is prepared. A series of La0. 05Ni0. 95Co2O4 and La0. 1Ni0. 9Co2O4 films with different thicknesses are prepared, the obtained films have stable vertical magnetic anisotropy, the Curie temperature is above room temperature, and the films have excellent conductivity and good performance.

The invention provides a magnetically soft alloy material and a preparation method and application thereof, and relates to the technical field of magnetically soft alloys. Specifically, the chemical formula of the magnetically soft alloy material is Y2Fe17-xMex, Me comprises at least one of Mn, Cr, Co and Ni, and x is greater than or equal to 1 and less than or equal to 16; the preparation method comprises the following steps: preparing metal raw materials, putting the metal raw materials into a vacuum arc furnace, repeatedly smelting for 3-5 times in a protective gas environment, and cooling to obtain the magnetically soft alloy material. According to the invention, doping of specific element types is carried out on the basis of a conventional R2M17 type alloy material, the Curie temperature of the soft magnetic alloy material is obviously improved, and the soft magnetic alloy material can be suitable for being used in a high-temperature environment and has a good application prospect.

The invention discloses a magnetic refrigeration material with a dimension cross critical behavior and a preparation method and application thereof, and belongs to the technical field of magnetic materials. HoNi2 thin strips are prepared through a melt rapid quenching method, critical indexes beta = 0.215, gamma = 0.748 and delta = 4.489 of the HoNi2 thin strips are measured through a corrected Arrott curve and a Kouvell-Fisher method, and it is found that the material has the dimension cross behavior from 3D to 2D near the Curie temperature (TC = 14K); due to the characteristic, the low-temperature magnetic refrigeration material shows excellent performance (when [mu] 0 [delta] H is equal to 5T, [delta] SMmax is equal to 20J kgK) in the field of low-temperature magnetic refrigeration, and is suitable for low-temperature refrigeration equipment for hydrogen liquefaction and the like.

The present disclosure provides an induction heating system and method that includes a workpiece that can be a multi-layered tube. The multi-layered tube includes an inner layer for carrying effluent and an outer layer surrounding at least a portion of the inner layer. The outer layer has a higher Curie temperature than the inner layer such that the outer layer remains magnetic at or above a reaction temperature of the effluent to maximize hysteresis losses in the tube up to and beyond the reaction temperature of the effluent. The inner layer can have desired mechanical, thermal, and chemical properties such that the combination of the outer layer and the inner layer results in a multi-layered tube that is effective for induction heating up to and beyond the reaction temperature while also being mechanically and thermally suitable for hydrocarbon processing applications.

A method for fast laser heating and cooling for nano / micro diamond is provided. The method includes performing laser irradiation and thermal dissipation on a reduced graphene oxide (rGO) sample. The rGO sample is dispersed on transmission electron microscopy (TEM) copper grids and nanodiamonds containing nitrogen-vacancy (NV) centers are dispersed on the rGO sample. The rGO sample is placed in a vacuum chamber and NV spins are polarized and read out by green laser. Further, the spin states of NV spins are manipulated by microwave. The polarizing and reading out are conducted at room temperature, while the manipulating spin states is conducted at high temperatures. The heating and cooling rates are significantly improved using reduced graphene oxide as the laser absorber and heat drain, enabling coherent quantum operation at temperatures up to 1400 Kelvin, surpassing the Curie temperatures of all known magnetic materials.

A method of calibrating temperature of a resistive element includes: generating a standard resistance-temperature (R-T) curve for the resistive element in an isothermal condition, wherein the resistive element comprises a material with a Curie temperature; generating an operational R-T curve for the resistive element during a normal operation of the resistive element; shifting the operational R-T curve toward the standard R-T curve at the Curie temperature to generate an adjusted operational R-T curve; and adjusting a measured temperature of the resistive element based on a resistance of the resistive element and the adjusted operational R-T curve.

The invention discloses a high-entropy amorphous alloy sensor with high sensitivity and high Curie temperature and a preparation method of the high-entropy amorphous alloy sensor, and the high-entropy amorphous alloy sensor comprises the following components in atomic percent: 25-30% of Co, 25-30% of Fe, 15-25% of Ni, 10-15% of Si, 10-15% of B, 1-2% of Cu, 1-2% of Nb and 1-2% of Mo. The preparation method comprises the following steps: proportioning the alloy in proportion, repeatedly melting the alloy in a vacuum induction heating furnace for at least five times to ensure uniform components, preparing an amorphous ribbon through a vacuum single-roller rotary quenching and jet casting system, and preparing the amorphous ribbon into the sensor through photoetching and corrosion methods. And the prepared sensor can be used in the fields of biomedical detection, magnetic signal detection and the like.

This invention discloses an electromagnetic ultrasonic online monitoring probe, device, and method for steam pipelines with a coating layer. The probe includes: a butterfly coil for supplying a DC-like current, or simultaneously supplying a DC-like excitation current and a strong pulse excitation current; and a zigzag coil for supplying a strong pulse excitation current. The zigzag coils are unequally spaced, with the spacing gradually decreasing from the input end to the output end. Supplying a DC-like excitation current into the butterfly coil generates a bias magnetic field; supplying a strong pulse excitation current into the butterfly coil excites ultrasonic body waves, while supplying a strong pulse excitation current into the zigzag coil excites ultrasonic guided waves, thereby enabling pipeline wall thickness and defect detection. The guided waves excited by the unequally spaced zigzag coils exhibit Chirp signal characteristics, allowing for pulse compression to improve the signal-to-noise ratio and resolution of the ultrasonic echo signal. The probe is small in size, unaffected by Curie temperature, and suitable for continuous high-temperature detection and detection in narrow areas.

The invention provides a nickel-zinc-copper ferrite material and a preparation method and application thereof, the nickel-zinc-copper ferrite material comprises main components and auxiliary components, the main components comprise 49.3 to 55.78 mol% of Fe2O3, 27.2 to 32.94 mol% of ZnO, 5.58 to 8.27 mol% of NiO, 8 to 12 mol% of CuO and 0.02 to 0.8 mol% of CoO; and the auxiliary components comprise CaCO3, Bi2O3 and V2O5 (vanadium pentoxide). According to the nickel-zinc-copper ferrite material disclosed by the invention, by controlling a main component formula and an auxiliary component formula, the nickel-zinc-copper ferrite material has magnetic conductivity of more than 2000 in a temperature range of-55 to 180 DEG C, and is low in temperature coefficient, high in Curie temperature, high in Bs and excellent in mechanical property, and the application range of the nickel-zinc-copper ferrite material in the field of electronic devices is greatly expanded.

This application discloses a three-dimensional germanium-based halide perovskite ferroelectric material, its preparation method, and its applications, belonging to the field of materials science. The molecular formula of the three-dimensional germanium-based halide perovskite ferroelectric material is (CH7N2)GeI3. This three-dimensional germanium-based halide perovskite ferroelectric material is lead-free, has a high Curie temperature, and a low coercive field; moreover, this material can be prepared by a solution cooling method, which has mild reaction conditions, is simple and easy to implement, and is inexpensive; due to its strong X-ray absorption and long carrier migration lifetime, it has bright application prospects in fields such as X-ray detection.

This application proposes a strong ferromagnetic ceramic thin film based on iron-tin co-doped amorphous gallium oxide, belonging to the technical field of magnetic semiconductor ceramic materials. The invention involves thoroughly mixing Ga, Fe, and Sn organic precursor solutions in a specific ratio to form a GaFeSn organic precursor solution; spin-coating the GaFeSn organic precursor solution onto a cleaned single-crystal alumina substrate; then placing the resulting GaFeSn organic precursor film into a single-temperature tube furnace; under an air atmosphere, slowly raising the furnace temperature to 550°C at a rate of 5°C / min, and annealing at 550°C for 1 hour to prepare a uniformly thick amorphous GaFeSnO magnetic ceramic thin film with strong ferromagnetism. This invention excites strong ferromagnetism in the film with a relatively low iron doping concentration (10%), solving the problem of low conductivity caused by transition metal doping in magnetic ceramic thin films. The amorphous GaFeSnO magnetic ceramic thin film prepared by this invention exhibits a conductivity of 170 emu / cm² at 2K. 3 90 emu / cm at 300K 3 It has strong ferromagnetism and a Curie temperature as high as 335K.

The application provides an electric core, a battery module, a battery, an electronic device, a mobile device and an energy storage device. The electric core comprises a bare electric core, an electric core shell, a first temperature sensing magnet and a first dry reed. The first temperature sensing magnet is used for sensing the temperature inside the electric core. If the temperature inside the electric core is equal to or higher than the Curie temperature of the first temperature sensing magnet, the magnetism of the first temperature sensing magnet disappears, and the Curie temperature of the first temperature sensing magnet matches the critical temperature of thermal runaway of the electric core. After the magnetism of the first temperature sensing magnet disappears, the conduction state of the first dry reed changes, so that the battery management system determines that the electric core has a thermal anomaly after detecting the change of the conduction state of the first dry reed. Therefore, the thermal anomaly of the electric core can be accurately and timely warned.

This invention relates to the field of anti-icing technology for power transmission lines, and discloses a rare-earth alloy magnetic material, its preparation method, an anti-icing device, and a power transmission line. The general chemical formula of the rare-earth alloy magnetic material is TM. a RE b Si c B d The material contains one or more of Fe, Ni, Cr, Co, and Mn, and one or more of Pr, La, Nd, and Ce. Through the synergistic ratio of transition metals and rare earth elements, combined with lattice modulation of Si and B elements, the Curie temperature of the material can be adjusted within the range of 20℃ to 40℃. The preparation method includes precise raw material formulation, melting and molding under a vacuum inert atmosphere, and staged high-temperature long-term heat treatment to promote the stable formation of the low Curie temperature magnetic phase and suppress the precipitation of impurity phases. The resulting magnetic material can adaptively generate heat with temperature changes in low-temperature, icing-prone environments, making it suitable for devices such as pre-twisted wires, sleeves, and snow-blocking rings for anti-icing purposes in transmission lines. It has the advantages of low energy consumption, high reliability, and strong engineering adaptability.