27 results about "Crystal anisotropy" patented technology

The invention discloses a method and system for detecting the magnetization direction of an unmagnetized magnet, and belongs to the technical field of magnetic material detection. The method comprises the following steps: applying an external guide magnetic field to a to-be-detected non-magnetized magnet; detecting a signal related to the physical state of the non-magnetized magnet under the action of the guide magnetic field as a response signal; and judging the magnetization direction of the non-magnetized magnet based on the corresponding relation between the response signal and the preset magnetization direction. The corresponding system comprises a guide magnetic field generation unit, a detection unit and a discrimination unit. The modulation effect of magnetocrystalline anisotropy of a non-magnetized magnet on an external magnetic field is utilized, invisible magnetic domain orientation information is converted into externally observable physical field difference, efficient, visual and lossless recognition of the preset magnetization direction is achieved, and the method is suitable for production quality control of magnetic assemblies such as a Halbach magnetic circuit and the like.

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.

This invention discloses a method for preparing anisotropic samarium iron nitrogen magnetic powder, belonging to the field of magnetic materials technology. The method includes the following steps: preparing Sm and Fe according to the designed composition, melting them to obtain samarium iron alloy molten steel; casting the samarium iron alloy molten steel onto a cooling roller to obtain iron-samarium alloy sheets; placing the iron-samarium alloy sheets in a vacuum heat treatment furnace for homogenization treatment; cooling the homogenized alloy sheets to 200-300°C; introducing hydrogen into the furnace under vacuum, controlling the absolute pressure of hydrogen at 0.05-0.1 MPa, and hydrogenating for 2 hours; after hydrogenation, raising the temperature to 400°C, filling with nitrogen to 0.5 MPa, raising the temperature to 530°C, and then lowering the furnace temperature to room temperature to obtain the anisotropic samarium iron nitrogen magnetic powder. This invention provides a method for preparing samarium iron nitrogen magnetic powder, which has the advantages of simple preparation process, low energy consumption, high production efficiency, small magnetic powder particle size, high magnetic properties, and good magnetic crystal anisotropy.

The laser chip and its fabrication method disclosed herein include a first reflective layer, an active region, an oxide layer, and a second reflective layer sequentially disposed on a substrate. The laser chip has a first trench and a second trench for oxidizing and etching the oxide layer. A first connecting portion connects one end of the first trench to one end of the second trench, and a second connecting portion connects the other end of the first trench to the other end of the second trench. Due to the influence of crystal anisotropy on the oxidation rate, and the mutual coordination of the first and second connecting portions on the oxidation rate, the oxide aperture includes a first oxide arc, a second oxide arc, a third oxide arc, and a fourth oxide arc. The first and second oxide arcs are arranged opposite each other, as are the third and fourth oxide arcs. The third and fourth oxide arcs have different radii of curvature, forming a specific irregular morphology. The oxide aperture based on the irregular morphology can effectively suppress transverse multimode lasing of the optical signal and reduce mode degeneracy.

The invention relates to the field of MnZn ferrite materials, in particular to a high-temperature low-loss high-permeability MnZn ferrite material and a preparation method thereof. The material comprises main components and auxiliary components, the main components comprise Fe2O3, ZnO and MnO, and the auxiliary components comprise CoMe < x > Fe < 2-x > O < 4 > (wherein Me is a metal element), Nb2O5, ZrO2, TiO2, SnO2, and at least one of CaCO3, SiO2, CuO and Bi2O3. Wherein the CoMe < x > Fe < 2-x > O < 4 > takes CoFe2O4 as a matrix and is obtained through ion doping, the CoMe < x > Fe < 2-x > O < 4 > has the characteristics of high resistivity and low coercive force, and dual functions of regulating magnetocrystalline anisotropy constants and forming a high-resistance-state magnetic grain boundary layer between grains are realized. The MnZn ferrite material prepared by the method has excellent electromagnetic characteristics of low loss, high magnetic conductivity and high saturation flux density at a high temperature of 140 DEG C.

The invention discloses a method for preparing a high-performance cerium neodymium iron boron magnet based on a powder modification process, and belongs to the technical field of rare earth permanent magnet materials. The component-process collaborative optimization strategy is characterized in that a proper low-melting-point rare earth alloy diffusion source is selected and a magnetic powder rotating coating process is combined according to the change characteristics of magnetocrystalline anisotropy fields HA in main phase grain cores with different Ce substitution amounts based on magnet component design; and a high-HA magnetic hardening shell layer is constructed on the surface layer of the main phase crystal grains in situ. Therefore, by regulating and controlling the components of the shell layer, the HA in the core and the HA in the shell layer reach a dynamic synergistically enhanced balance state, and the synchronous reversal of the core-shell structure in the demagnetization process is ensured, so that the demagnetization process is inhibited to the greatest extent, and the coercive force of the magnet is improved.

The application relates to the field of MnZn ferrite materials, in particular to a high-temperature low-loss high-permeability MnZn ferrite material and a preparation method. x Fe 2‑x O4 (wherein Me is a metal element), Nb2O5, ZrO2, TiO2, SnO2, and at least one of CaCO3, SiO2, CuO and Bi2O3. Among them, CoMe x Fe 2‑x O4 is a CoFe2O4 matrix and is obtained through ion doping, has high resistivity and low coercivity characteristics, realizes the double functions of regulating the magnetic crystal anisotropy constant and forming a high-resistance state magnetic grain boundary layer between the crystal grains. The MnZn ferrite material prepared by the method has excellent electromagnetic characteristics of low loss, high permeability and high saturation magnetic induction intensity at 140 DEG C high temperature.

The application belongs to the technical field of electronic information materials, and specifically provides a method for preparing M-type barium ferrite monocrystal thin film under low temperature conditions; the method is characterized by innovative design of liquid phase raw materials and strict design of liquid phase epitaxy process parameters, and can grow the M-type barium ferrite monocrystal thin film with excellent performance on SGGG (111) substrate by liquid phase epitaxy method under low temperature conditions of 830-850 DEG C, which is not only simple in process and low in cost, but also has high crystallization quality, no impurities and defects. The M-type barium ferrite monocrystal thin film prepared by the method is a single crystal material, the film thickness is up to 150 mu m, the saturation magnetization is about 4500 Oe, the remanence is about 1000 Oe, the easy magnetization axis (c axis) is perpendicular to the film surface, has high uniaxial magnetic crystal anisotropy field, and is very beneficial to realize self-bias design of the device.

The invention discloses a mixed grain boundary diffusion source for sintering an NdFeB magnet and a preparation method and application of the mixed grain boundary diffusion source, and belongs to the technical field of grain boundary diffusion processes of sintered NdFeB permanent magnet materials, the diffusion source is prepared by mixing Pr70Al20Cu10 alloy powder and TbHx powder in proportion, Al and Cu elements in the Pr70Al20Cu10 alloy powder can better play a role in wetting a grain boundary phase, the grain boundary phase distribution is more uniform, and the grain boundary performance is improved. The diffusion effect is assisted, a heavy rare earth element Tb in the TbHx powder generates a shell structure with higher magnetocrystalline anisotropy around main phase grains to improve the coercive force effect of the magnet, in the grain boundary diffusion technological process, the magnets are vertically stacked and pressed to apply pressure between the magnets, the contact capacity between the magnets is improved, and the coercive force effect of the magnet is improved. The diffusion effect is improved.

The application provides a memory device with low power consumption and high thermal stability factor and a preparation method thereof, the device comprising, from bottom to top, a substrate, a spin / orbit flow generation layer, a ferromagnetic functional layer, a SiO2 layer, an electrode sheet and a regulation layer; the material of the spin / orbit flow generation layer is two-dimensional transition metal chalcogenide material TaIrTe4, the material of the ferromagnetic functional layer is two-dimensional ferromagnetic material Fe 3+x GaTe2, x=0-2, and the material of the regulation layer is two-dimensional ferroelectric material CuVP2S6; an electric field is applied to the left and right ends of the regulation layer. The vertical magnetic crystal anisotropy of the ferromagnetic functional layer is changed by regulating the ferroelectric material CuVP2S6 through the external electric field, the writing process of a large current of the device is reduced, so that the power consumption is reduced and the thermal stability is improved, and the durability is improved.

The application provides a high-Ce-content sintered magnet and a preparation method thereof, and relates to the technical field of rare earth permanent magnet materials. A Ce-rich main phase with a Ce content greater than 22.0wt.% is used as a main alloy, and sintered Nd-Fe-B magnet waste containing heavy rare earth Dy and Tb and having a coercivity greater than 20kOe is used as an auxiliary alloy to provide main phase grains with high magnetic crystal anisotropy field (H A ). By designing the powder particle size of the two main phase alloys and the heat treatment process, the main phase grains with small particle sizes and rich in heavy rare earth Dy and Tb are uniformly dispersed around the Ce-rich main phase grains, and the solid-solid diffusion between the two kinds of main phase grains is utilized in long-time sintering-in-situ diffusion heat treatment to construct a Dy and Tb-rich shell layer with high H A on the surface layer of the Ce-rich main phase grains, while the fine grain size is maintained, so that the sintered magnet with high Ce content and good magnetic properties is prepared by using sintered Nd-Fe-B magnet waste.

This invention discloses a beneficiation method for high-talc molybdenum ore based on the anisotropy of mineral crystals, comprising the following steps: 1) grinding of the raw ore; 2) molybdenum pre-selection; 3) regrinding with planetary ball mill; 4) molybdenum reverse flotation; and 5) molybdenum direct flotation. Based on the anisotropy of mineral crystals, this invention changes the grinding method by using planetary ball milling, exposing more easily oxidized and hydrophilic end faces of molybdenite before it enters the flotation stage, reducing the difference in hydrophilicity and hydrophobicity of the mineral surface controlled by flotation. Then, by adding the oxidant sodium persulfate and the combined inhibitors dextran and polyepoxysuccinic acid, the hydrophilicity of the molybdenite surface is synergistically enhanced, resulting in talc concentrate and molybdenum rough concentrate. The grade of the molybdenum rough concentrate is then improved through molybdenum direct flotation. This beneficiation method eliminates the need for pre-selection to remove talc, reducing the loss of molybdenum ore during desliming. Using this method, a molybdenum grade of not less than 50% and a molybdenum recovery rate of not less than 72% can be obtained in the molybdenum concentrate, achieving efficient flotation separation of high-talc molybdenum ore.

The application discloses a cold-rolled steel low-residual-magnetic annealing process, which comprises the following steps: placing steel into an annealing furnace and heating to 670-700 DEG C, keeping for 55-70 min to eliminate deformation strengthening and residual stress; then reducing the temperature of the steel to 480-520 DEG C at an average cooling speed less than 1.5 DEG C / min; then heating the steel to 780-810 DEG C, keeping for 170-190 min to increase the grain size and eliminate the residual magnetic field in the material through the movement of the thermal activated magnetic domain wall; injecting a protective atmosphere, reducing the temperature of the steel to 640-670 DEG C at an average cooling speed less than 1 DEG C / min, and performing magnetic gas annealing to reduce the oxides and impurities in the steel, improve the magnetic crystal anisotropy of the magnetic material, improve the magnetic permeability and the magnetic saturation induction intensity of the magnetic material, and finally make the steel reach an extremely low residual magnetism with a magnetic field intensity less than 1 a / cm and good magnetic properties.

According to the low-cost high-magnetic-conductivity high-magnetic-shielding magnetically soft alloy and the preparation method thereof, Fe-Si-Al is adopted as a basic system, microalloying elements such as B and Nb are creatively introduced, specific critical cold rolling and magnetic field heat treatment processes are adopted, and the obtained magnetically soft alloy has high magnetic conductivity and high magnetic shielding effectiveness. Wherein the resistivity of the alloy is effectively improved and the magnetocrystalline anisotropy is optimized through the synergistic effect of Si and Al; the grain boundary segregation effect of the B element purifies the grain boundary, and the moving resistance of the magnetic domain wall is remarkably reduced; and the dispersed precipitated phase formed by the Nb element effectively refines the initial crystal grains and lays a foundation for subsequent formation of uniform and thick recrystallized crystal grains. Particularly, a strong Gaussian texture is induced through accurately controlled critical cold rolling deformation, and magnetic domains are directionally arranged in an easy magnetization direction in combination with magnetic field heat treatment applied near a Curie point, so that the coercive force is fundamentally reduced, and the initial magnetic conductivity is improved.

The invention particularly relates to a method for regulating and controlling twisted spin waves in a cylindrical magneton crystal, and belongs to the field of spintronics. According to the scheme, a ferromagnetic cylindrical magneton crystal with periodical modulation magnetocrystalline anisotropy is constructed, theoretical analysis is carried out on a magnetic oscillator energy band structure of the ferromagnetic cylindrical magneton crystal, and it is shown that twisted spin waves with any orbital angular momentum have the magnetic oscillator band gap characteristic at the boundary of a Brillouin region. By accurately regulating and controlling parameters such as magnetocrystalline anisotropy strength or a magneton crystal lattice constant, effective tuning of the band gap position and width of the twisted spin wave can be realized, and further accurate control of the propagation behavior of the twisted spin wave can be realized. The method has important significance for realizing high-capacity information transmission and processing based on the twisted spin wave.

The invention relates to a wide-temperature, low-temperature-coefficient and high-permeability soft magnetic ferrite material, and belongs to the technical field of electronic ceramic materials. The material is composed of main components and auxiliary components, wherein the main components comprise Fe2O3, ZnO and MnO; and the auxiliary components comprise Bi2O3, MoO3, CaCO3 and CoO. The preparation method comprises the following steps: pre-sintering the main components, carrying out ball milling on the main components and the auxiliary components, granulating, carrying out compression molding, and sintering under a specific atmosphere curve. Through the magnetocrystalline anisotropy compensation effect of CoO and in combination with the co-sintering of Bi2O3 / MoO3 and the grain boundary regulation and control effect of CaCO3, the excellent comprehensive performance that the initial magnetic conductivity of the material can reach 6500 within the extremely wide temperature range of-50 DEG C to 170 DEG C, the temperature coefficient alpha F of the material is-0.5-0.5 at the temperature of-50 DEG C to 50 DEG C, and the alpha F of the material is 0-1 at the temperature of 50 DEG C to 80 DEG C is achieved synergistically.

The invention discloses a barium-strontium permanent magnetic ferrite material with a high torque-to-magnetic ratio and a preparation method thereof, relates to the technical field of electronic information materials, and discloses the barium-strontium permanent magnetic ferrite material with the high torque-to-magnetic ratio and the preparation method thereof. The barium-strontium permanent magnetic ferrite material with the high torque magnetic ratio is based on barium-strontium ferrite of a magnetoplumbite structure, the chemical formula is expressed as Ba < 0.5-x > Pr < x > Sr < 0.5-y > HoyFe < 12-x-y > Co < x + y > O < 19 >, x is equal to 0.05-0.15, y is equal to 0.05-0.15, x and y are molar stoichiometric ratios, and the barium-strontium permanent magnetic ferrite material with the high torque magnetic ratio has the advantages that rare earth Pr < 3 + > ions and Ho < 3 + > ions capable of improving magnetocrystalline anisotropy are added to replace Ba < 3 + > ions and Sr < 3 + > ions on the basis of a ferrite material of Ba < 0.5 > Sr < 0.5 > Fe < 12 > O < 19 >, so that the magnetic anisotropy of meanwhile, Fe < 3 + > ions are replaced by Co < 2 + > ions, so that the Curie temperature and the equilibrium valence of the material are improved; and secondly, a constant-pressure cold sintering process is adopted in the process, and magnetic field orientation is added, so that a microstructure with a high orientation degree is obtained, the torque-to-magnetic ratio performance of the material is improved, and the barium-strontium permanent magnetic ferrite material with a high torque-to-magnetic ratio is obtained.

The invention relates to an M-type barium ferrite polycrystalline material suitable for a Ka-band self-biased circulator and a preparation method of the M-type barium ferrite polycrystalline material, the molecular formula of the crystal is Ba0. 7La0. 3Fe (10.9-11.7)-xZn0. 3ScxO19, and x is more than 0 and less than 0.6. The preparation method comprises the following steps: calculating the element ratio, weighing the raw materials BaCO3, Fe2O3, La (OH) 3, ZnO and Sc2O3, mixing the raw materials, matching with a steel ball for wet grinding, standing after wet grinding, filtering water, drying a deposited material, grinding the dried material into powder, and pressing the powder into a cake blank; presintering the cake blank sample at high temperature to form an M phase; the method comprises the following steps: crushing an M-phase sample into powder, carrying out ball milling, controlling the particle size of the powder to be smaller than a single domain critical limit 0.9 mu m, standing ball-milled slurry on filter cloth for 8 hours, controlling the moisture content to be 30-40%, and then carrying out wet orientation to form a preferred orientation green body; and sintering the green body at high temperature. The magnetocrystalline anisotropic field has the advantages that the numerical value of the magnetocrystalline anisotropic field can meet about 8000 Oe, the magnetocrystalline anisotropic field can be adjusted according to the Sc content, and the service conditions of self-biased circulators with different center frequencies can be met.

The application discloses a horizontal steering wheel strip-shaped automatic magnetic free-stretching data line, a preparation method and application. The data line comprises a flexible coating on the core, a flexible permanent magnetic coating layer in the middle and a flexible outer coating layer from inside to outside, and the preparation method comprises the following steps: step A, extrusion molding; step B, first north-south direction 180° constant magnetic field orientation magnetization, horizontal steering wheel strip-shaped shaping and preliminary forming; and then magnetization, horizontal reverse steering wheel strip-shaped automatic magnetic free-stretching data line. The application aims to solve the phenomenon that the existing technology data line automatic curling magnetic attraction is not completed, and the samarium iron nitrogen magnetic performance of the magnetic crystal anisotropy field which is much higher than other permanent magnetic materials can be better played through the improvement of the magnetization mode, so that the data line has the advantages of temperature resistance, corrosion resistance and demagnetization resistance, and the magnetic layer thickness is not required to be increased to meet the data line attraction requirement.

A high T c High B s High manganese zinc ferrite and preparation method, belong to ferrite material preparation technical field. The present application adopts brand-new rich iron little zinc main formula design, through the regulation and control spinel sublattice inter super exchange, in satisfying high Curie temperature, make up the defect of starting magnetic permeability drop; Introduce a variety of additives to play the comprehensive effect, through Ti 4+ Regulate the magnetic crystal anisotropy constant, improve the magnetic permeability, promote the growth of large grain through low melting point fluxing additive, it is favorable to the formation of high magnetic permeability material, increase the density of sintered body at the same time, so as to improve the saturation magnetic induction intensity;Provide a new sintering thought in the holding stage, optimize the sintering oxygen partial pressure curve in the whole process, under the condition of little change in production cost, the comprehensive performance of the material is improved to a higher level. The present application has obtained the MnZn ferrite with high Curie temperature, high magnetic permeability and high saturation magnetization.

The application relates to the technical field of magnetic functional materials, in particular to a light rare earth Pr-based ultrahigh magnetostrictive material and a preparation method thereof. The material is prepared from the following raw materials in parts by weight: 20-35 parts of praseodymium-neodymium mixed rare earth metal, 60-75 parts of pure iron, 3-8 parts of metal cobalt, 0.5-2 parts of metal niobium, 0.1-0.5 parts of additive A and 0.5-2 parts of additive B. The additive A is enriched at the grain boundaries, hinders the coarsening of the grains in the processing process, thereby obtaining fine grain structures, and provides an optimized microstructure basis for the magnetostrictive performance. Meanwhile, the additive B is used to improve the bonding state between the rare earth phase and the ferromagnetic matrix, and promotes the directional rotation process of the magnetic domains under the external magnetic field. The effects are combined with the inherent strong magnetic crystal anisotropy of the Pr element and the specific hydrogen crushing and magnetic field orientation hot-pressing process, and the magnetostrictive strain and driving capacity of the material are synergistically enhanced.

The application provides a kind of magnetoresistive angle sensor, it includes: first magnetoresistive sensor, it includes the first magnetoresistive sensor unit, second magnetoresistive sensor unit, third magnetoresistive sensor unit and fourth magnetoresistive sensor unit interconnected to establish first Wheatstone bridge;Second magnetoresistive sensor, it includes the fifth magnetoresistive sensor unit, sixth magnetoresistive sensor unit, seventh magnetoresistive sensor unit and eighth magnetoresistive sensor unit interconnected to establish second Wheatstone bridge;Wherein each described magnetoresistive sensor unit includes several photoetching circular magnetic thin films and several metal films, and the several photoetching circular magnetic thin films are electrically interconnected by the several metal films.Compared with prior art, the application can eliminate shape anisotropy field and magnetic crystal anisotropy field, thereby significantly reducing the detection error of angle, improve the detection accuracy of angle.

The application discloses a data line with a vertical steering wheel strip-shaped automatic magnetic free stretching data line and a preparation method and application, the data line comprises a flexible coating on a core, a flexible permanent magnetic coating layer in the middle and a flexible outer coating layer from inside to outside in sequence, and the preparation method comprises the following steps: step A, extrusion molding; step B, first, pre-magnetization is performed to form a vertical steering wheel strip-shaped shape, then, a 180-degree constant magnetic field in the north-south direction is used for orientation, and finally, magnetization is performed. The application aims to solve the phenomenon that the automatic winding and magnetic attraction of the prior art data line are not completed, so that the magnetic crystal anisotropy field of samarium iron nitrogen which is much higher than other permanent magnetic materials can be better used, the data line has better advantages such as temperature resistance, corrosion resistance and demagnetization resistance, and the requirement of the data line attraction force can be met by thickening the magnetic layer.

The invention discloses a preparation method of flower-like nano-silver particles, which comprises the following steps: preparing a mixed aqueous solution of ascorbic acid and a surfactant, heating and stirring; preparing a silver nitrate aqueous solution, heating and stirring; and dropwise adding the silver nitrate aqueous solution into the mixed aqueous solution at the rate of 10-35 mL / min, and continuously reacting for 5-10 minutes after dropwise adding is finished, so as to obtain the flower-shaped nano-silver particles. The method is simple in process operation, the reaction is carried out in a water phase at normal pressure and medium temperature, ascorbic acid is used as a reducing agent, toxic solvents are avoided, complicated equipment (such as vacuum and laser) is not needed, the method is green and environment-friendly, and controllable growth of flower-like morphology is finally formed by controlling anisotropic growth of silver crystals; and flower-like nano-silver particles with uniform morphology and high purity are prepared under mild conditions by a one-step method.

The application provides a ceramic injection molding 3D winding surface type Ni-Zn ferrite material and a preparation method thereof. The material is composed of Fe2O3 45wt%-49wt%, NiO 18wt%-33wt%, ZnO 22wt%-33wt%, CuO 5wt%-7wt%, SnO2 0.2wt%-1.0wt%, Co3O4 0.3wt%-0.7wt% and modified multi-walled carbon nanotubes 1.2wt%-1.5wt% by weight. The modified multi-walled carbon nanotubes are multi-walled carbon nanotubes loaded with Fe2O3 / Fe3O4 on the surface. The material is suitable for ceramic injection molding, can accurately form the required curved surface, thin wall and fine groove of the 3D winding surface type, can improve the sintering density by adding SnO2, can optimize the powder dispersibility by adding the modified multi-walled carbon nanotubes, can greatly improve the material fluidity and forming stability, can avoid the problem of low magnetic core precision, can adjust the magnetic crystal anisotropy by adding Co3O4, can reduce the permeability fluctuation rate at low temperature, can improve the mechanical strength after debinding and sintering, and can reduce damage in use. The material has the advantages of long service life, reasonable component design, simple implementation, and easy popularization and implementation.

The invention discloses a permanent magnetic ferrite with high thermal stability and a preparation method and application thereof, and belongs to the technical field of permanent magnetic ferrites.Praseodymium oxide and manganous-manganic oxide are added into a formula of the permanent magnetic ferrite, Br and Hcj indexes are high at normal temperature, and compared with the temperature coefficient, the absolute value of the temperature coefficient is smaller, and the change rate of performance along with temperature is smaller; as Mn < 2 + > and Mn < 3 + > ions occupy hexagonal crystal gaps in ferrite crystal lattices, the sensitivity coefficient of the magnetic moment to the temperature change is obviously lower than that of Fe < 3 + >, Mn < 2 + > and Mn < 3 + >, the confusion degree of magnetic domains can be inhibited, crystal lattice parameters can be finely adjusted, the stability of the crystal lattices can be improved, and the magnetocrystalline anisotropy constant is more gentle along with the change of the temperature; pr < 3 + > inhibits overgrowth of crystal grains, refines the crystal grains, adjusts magnetocrystalline anisotropy constants, enhances magnetic domain overturning resistance, improves Hcj, reduces internal pores and improves ferrite density.

The invention discloses a method and a device for predicting the high-temperature creep fatigue life of a nickel-based single crystal. The method comprises the following steps: obtaining a stress-strain hysteretic loop of a material in a stable cycle or a half-life cycle through experimental testing or combination of a material constitutive model and finite element simulation; extracting slitting shear stress, slitting shear strain, slitting positive stress and slitting positive strain on octahedral and hexahedral slip systems according to the stress-strain hysteretic loop and the orientation of the test sample; fatigue damage is calculated according to the stress-strain amplitude on the slip system, creep damage is calculated according to the stress-strain hysteresis loop, and creep-fatigue coupling damage is calculated according to the creep damage and the fatigue damage; and judging whether the creep damage is tensile creep or compression creep so as to calculate total damage, and obtaining the creep fatigue life according to the total damage. According to the method, the crystal anisotropy characteristics of the nickel-based single-crystal high-temperature alloy can be considered in a unified manner, and creep fatigue life prediction based on a physical mechanism is realized.