22 results about "Samarium cobalt" patented technology

The invention relates to the technical field of permanent magnet materials, in particular to a method for increasing resistance of a permanent magnet, which comprises the following steps of: (1) weighing raw materials, smelting and refining to obtain alloy melt; (2) the alloy melt is subjected to cooling, powdering, forming, sintering treatment and aging treatment, cooling is conducted, and a samarium cobalt blank is obtained; (3) the samarium cobalt blank is subjected to machining grinding, slicing, end face grinding, cleaning and drying, and a plurality of flaky magnets are prepared; sequentially performing argon plasma treatment and nitrogen plasma treatment on each end surface of the flaky magnet, and sputtering a boron nitride layer and a silicon dioxide layer on the end surface of the flaky magnet by adopting a magnetron sputtering method; and carrying out annealing treatment, bonding and curing treatment to obtain the high-resistance permanent magnet. According to the method for increasing the resistance of the permanent magnet, the resistance of the rotor magnet can be effectively increased, and eddy current generated by the motor rotor magnet is further reduced.

The invention discloses a samarium-cobalt magnet and a preparation method thereof. The samarium-cobalt magnet takes low-melting-point alloy powder, samarium oxide powder and samarium-cobalt magnetic powder as raw materials; the component of the samarium cobalt magnetic powder is Sm (Co < 1-a-b-c > Fe Cu Zr < c >) < z >; the component of the low-melting-point alloy is RE1-xMx, RE is one or more of Pr, Nd and Sm, and M is one or more of Cu, Al and Ga. The preparation method comprises the following steps: smelting a samarium-cobalt alloy raw material and a low-melting-point alloy raw material, and sequentially performing coarse crushing, medium crushing and jet milling to obtain samarium-cobalt magnetic powder and low-melting-point alloy powder; mixing samarium oxide powder, low-melting-point alloy powder and samarium cobalt magnetic powder to obtain magnetic powder; sequentially performing magnetic field forming, cold isostatic pressing and low-temperature sintering to obtain a sintered blank; and the sintered blank is sequentially subjected to solution treatment and aging heat treatment. The bending strength and the fracture toughness of the samarium-cobalt magnet are greatly improved, and the samarium-cobalt magnet has high magnetic performance and good mechanical performance.

The invention discloses a rotor topological structure for preventing demagnetization of magnetic steel, which comprises a rotor iron core, the rotor iron core is provided with a plurality of magnetic poles, main magnetic steel grooves which are symmetrically arranged in a V shape are arranged on the rotor iron core under the same magnetic pole, and main magnetic steel made of neodymium iron boron materials is embedded in the main magnetic steel grooves. Auxiliary magnetic steel grooves are respectively arranged near two end parts of the main magnetic steel close to the excircle direction of the rotor, auxiliary magnetic steel made of samarium cobalt materials is embedded in the auxiliary magnetic steel grooves, and the auxiliary magnetic steel is used for increasing the local magnetic resistance of the area where the auxiliary magnetic steel is located so as to restrain the demagnetization of the end parts of the main magnetic steel; the design cost of the rotor topological structure is slightly increased, the influence on a main magnetic field is small, and the anti-demagnetization capability can be remarkably improved.

The invention belongs to the technical field of permanent magnet materials, and relates to a preparation method of a high-strength and high-toughness samarium-cobalt permanent magnet, which comprises the following steps: burdening, smelting, pulverizing, orientation forming, cold isostatic pressing, sintering, solid solution and aging treatment. The aging treatment comprises the following steps: under the protection of inert gas, carrying out primary heat treatment at 780-880 DEG C for 500-1500 minutes, then closing the inert gas, cooling to 200-500 DEG C, carrying out secondary aging treatment, carrying out heat preservation for 30-600 minutes, applying an external magnetic field, and finally cooling to room temperature. According to the method, an external magnetic field is added during secondary aging, gas protection is cancelled, the gas cost is reduced, and meanwhile, the mechanical property of the samarium-cobalt magnet is greatly improved under the condition that it is guaranteed that the magnetic property is basically unchanged.

This invention relates to a method for improving the machining quality and yield of samarium cobalt magnets, belonging to the field of precision machining technology for rare earth permanent magnet materials. The method includes: crystal orientation detection and determination of the free-cutting direction, directional compensation cutting, segmented temperature-controlled precision grinding, stepped vacuum stress relief treatment, and online closed-loop detection. Through five-segment coordinated control, the dimensional accuracy reaches ±0.003mm, the chipping and cracking defect rate is less than 0.5%, and the yield is increased to over 98%.

The invention provides a method for preparing a samarium-cobalt permanent magnet material based on pre-aging treatment, and relates to the technical field of samarium-cobalt permanent magnet materials. The invention discloses a method for preparing a samarium cobalt permanent magnet material based on pre-aging treatment. The method comprises the steps of precursor preparation, solution treatment, pre-aging treatment, rapid cooling, main aging treatment and the like. Through pre-aging treatment, segregation of solute atoms is promoted at low temperature, high-concentration point defects are formed, uniform and high-density nucleation sites are provided for main aging Sm (Co, Cu) 5 cell wall phase precipitation, precipitation kinetics is accelerated, a nano cellular structure is refined, fine regulation and control of a microstructure are achieved, and the mechanical properties of the Sm (Co, Cu) 5 are improved. The intrinsic coercive force of the magnet is remarkably improved, the residual magnetism and the maximum magnetic energy product of the magnet are synergistically improved, and the prepared samarium-cobalt permanent magnet material is higher in cell wall density, more uniform in distribution and more excellent in comprehensive magnetic performance.

A magnet includes a three-dimensional structure with nanoscale features, where the three-dimensional structure has a near net shape corresponding to a predefined shape.

The invention provides a Joule heating aging treatment method for a samarium cobalt-based rare earth permanent magnet material, and relates to the technical field of rare earth permanent magnet materials. The Joule heating aging treatment method of the samarium-cobalt-based rare earth permanent magnet material comprises the steps of cast ingot preparation, crushing powder preparation, forming and solution treatment, Joule heating aging treatment and cooling treatment. According to the method, the samarium-cobalt permanent magnet material is rapidly processed by Joule heating strong pulse current, atom migration and agglomeration are inhibited, high-density vacancy defects and dislocations are reserved, cell wall phase nucleation is promoted, the heat preservation time is greatly shortened, and the efficiency is improved and the cost is reduced by several times. The prepared material is uniform and fine in nano cellular structure, the key magnetic performance reaches the commercial level or even better, the process is simple, the method is suitable for industrial production, and the good application prospect is achieved.

This utility model discloses a fire hose fastening coupling, including a male connector and a female connector. The male connector has a tapered guide head at its end, with a samarium cobalt permanent magnet with a semi-circular notch embedded in its end face and connected to a sliding handle. The sliding handle passes through an L-shaped track groove. The female connector has a reverse magnet embedded in its inner wall and a guide groove. When connecting, the opposite pole magnet automatically corrects the notch. After insertion, the sliding handle is rotated 90° and pulled down, and the locking block is engaged in the recess to form a mechanical self-lock. The horizontal position of the sliding handle prevents loosening due to gravity. When unlocking, the sliding handle is pushed up and rotated to reset. The magnetic blind connection is accurate, the springless electromechanical structure requires no maintenance for life, the samarium cobalt magnet does not fail at -50℃, and the drainage hole and self-cleaning scraper ensure reliable operation in icy, snowy, and muddy environments. It is comprehensively superior to traditional fire hose couplings, redefining the reliability standard of fire hose couplings with three major breakthroughs: magnetic correction for faster blind connection, mechanical reverse hook for absolute anti-detachment, and no electromechanical components requiring no maintenance for life.

This invention relates to the field of rare earth samarium cobalt magnetic material sample preparation technology, specifically to a method and assembly device for preparing standard samples of rare earth magnetic declination; by setting up a correction pressing component and a jig disk component, the calibration block substrate is installed in the center of the non-magnetic material shell; this invention solves the technical problem of how to assemble the calibration block substrate in the exact center of the non-magnetic material shell during the assembly process of small and large standard samples.

The invention relates to a hybrid permanent magnet motor with damping holes and stator and rotor auxiliary grooves, and belongs to the technical field of permanent magnet synchronous motors. A VV-shaped built-in rotor structure is adopted, the damping holes are designed in the rotor structure to reduce torque pulsation and improve output torque, the auxiliary grooves are designed in a stator, and therefore the torque pulsation can be reduced; damping holes are formed in the rotor for trimming so as to reduce the cogging torque of the motor, the permanent magnet is formed by mixing samarium cobalt and neodymium iron boron, and the rotor is arranged in a segmented skewed pole mode. Multi-objective optimization is carried out on a plurality of key structure parameters, a Pareto optimal solution set is obtained by using a non-dominated sorting genetic algorithm (NSGA-II), and further optimization of motor average torque improvement and torque ripple suppression is realized. The motor disclosed by the invention has excellent demagnetization resistance and high torque density under a high-temperature working condition, meanwhile, torque ripple and harmonic distortion are effectively reduced, and the motor is suitable for high-performance application occasions such as an electric vehicle driving system and the like.

This invention provides a method for preparing samarium cobalt-based permanent magnets based on grain boundary diffusion of rare earth-copper alloys, relating to the field of permanent magnet materials technology. The invention first involves mixing Sm, Co, Fe, Cu, Zr, and optionally one or two of Ti and Hf, and then subjecting the mixture to melting, casting, powdering, magnetic field orientation pressing, cold isostatic pressing, sintering, solution treatment, and rapid cooling to obtain a solid-solution samarium cobalt-based sintered body A. Then, RE-Cu alloy powder B is coated onto at least one surface of the solid-solution samarium cobalt-based sintered body A, followed by composite aging treatment to obtain the samarium cobalt-based permanent magnet. This invention utilizes the low-melting-point or softened transient liquid phase formed by the RE-Cu alloy powder in the early stages of aging, which preferentially wets the grain boundaries and grain edge regions of the solid-solution SmCoFeCuZr-based sintered body, allowing Cu and a small amount of RE to rapidly diffuse along the grain boundaries, demonstrating promising application prospects.

The invention discloses a large-orientation-size samarium-cobalt magnet and a preparation method thereof, and belongs to the technical field of magnetic materials. The technical problem that an existing method cannot achieve better magnetic performance and lower cracking rate while guaranteeing the large orientation size (larger than or equal to 95 mm) is solved. The preparation method of the large-orientation-size samarium-cobalt magnet comprises the following steps: S1, smelting to prepare powder; s2, powder mixing and pressing are conducted, and a samarium cobalt blank is obtained; s3, the obtained samarium cobalt blank is subjected to sintering treatment and solution treatment; and S4, aging treatment is carried out, and the large-size oriented samarium-cobalt magnet is obtained after aging treatment. The orientation size of the samarium-cobalt magnet prepared by the method is more than 95 mm, and the maximum magnetic energy product is more than 28.23 MGOe.

This invention discloses a method for preparing high-resistivity, high-mechanical-strength sintered samarium-cobalt permanent magnets. The main steps of this method are as follows: samarium-cobalt alloy is subjected to air jet milling, and ultrafine magnetic powder A0, base material B0, and qualified magnetic powder CO generated during the air jet milling process are collected separately; the ultrafine magnetic powder A0 is controlled-actuated to obtain magnetic powder A1; the base material B0 is sequentially hydrogenated and air jet milled to obtain magnetic powder B2; magnetic powder A1, magnetic powder B2, and qualified magnetic powder CO are mixed uniformly to obtain mixed magnetic powder D; the mixed magnetic powder D is oriented and shaped to obtain a samarium-cobalt green blank E, and then the samarium-cobalt green blank E is made into a sintered samarium-cobalt permanent magnet. The sintered samarium-cobalt magnets prepared by this method simultaneously possess high resistivity and high mechanical strength, and fully utilize the two residual powders—ultrafine powder and base material—generated during the samarium-cobalt alloy air jet milling process, thereby improving the yield of samarium-cobalt alloy air jet milling powder, increasing resource utilization, and reducing production costs and energy consumption.

The utility model discloses an ultra wide band multi-nested microstrip two-section circulator, which comprises a base, a ceramic substrate, a microstrip circuit, ferrite, a ferrite substrate, a ceramic gasket and a samarium cobalt permanent magnet, the ferrite substrate is nested in a hole groove in the ceramic substrate through a nesting process to form a whole, the ceramic substrate is welded on the base through welding flux, the microstrip circuit is arranged on the upper surface of the ferrite substrate, the ceramic gasket is arranged on the microstrip circuit, and the samarium-cobalt permanent magnet is arranged on the ceramic gasket; the circulator is simple in structure, is suitable for surface mounting and microcircuit integration, and has the obvious advantages of good consistency, batch production, miniaturization and wide frequency band compared with a traditional circulator.

The invention discloses a reverse salient pole permanent magnet auxiliary synchronous reluctance motor with a composite magnetic barrier. The motor adopts a 54-slot 8-pole matched double-layer distributed stator winding. The rotor is of a reverse salient pole structure and is provided with eight semicircular salient poles protruding towards the circle center. Two layers of arc-shaped magnetic barriers facing the stator are arranged in each salient pole, the middle part of the inner-layer magnetic barrier is broken, and the outer-layer magnetic barrier is continuous; a rectangular permanent magnet containing groove is formed between every two adjacent salient poles, and a mixed permanent magnet formed by stacking neodymium iron boron and samarium cobalt permanent magnets is placed in each groove. Irregular circular magnetic barriers are arranged at the two ends of the accommodating groove and are connected with the two ends of the inner-layer disconnected magnetic barrier; 54 circular cooling channels are uniformly distributed in the stator yoke part and the rotor in the circumferential direction. Through the unique composite magnetic barrier and reverse salient pole rotor topology, the hybrid permanent magnet and the double-circulation cooling system, a magnetic circuit and a thermal circuit are cooperatively optimized, the salient pole rate, the torque density and the power factor of the motor are effectively improved, the torque pulsation is remarkably inhibited, and the heat dissipation performance and the demagnetization tolerance are enhanced.

The present disclosure relates to a method for recovering magnet material from a samarium cobalt, SmCo, magnet, the method comprising: initiating a hydrogen decrepitation process within a reaction vessel, wherein the hydrogen decrepitation process comprises: increasing a concentration of hydrogen in the reaction vessel, and maintaining the reaction vessel at either: a temperature of less than 70° C. and at a pressure of more than 10 bar, or at a temperature of more than 70° C. and at a pressure of less than 5 bar, to cause hydrogen decrepitation of the SmCo magnet disposed in the reaction vessel and produce SmCo-hydride material; and initiating a degasification process within a degasification vessel, wherein the degasification process comprises: removing gas from the degasification vessel and maintaining the degasification vessel at a temperature within a range of 150° C. to 300° C., to de-gas SmCo-hydride material disposed in the degasification vessel and produce SmCo material.

The invention relates to a method for measuring the 1: 5H cell wall phase thickness of a samarium-cobalt permanent magnet. The method comprises the following steps: preparing an electron microscope sample of the samarium-cobalt permanent magnet; placing the electron microscope sample in a field emission transmission electron microscope, and then tilting crystal grains of the electron microscope sample to the 1t of an intracellular main phase; 11 to 20 gt; a ribbon shaft; switching a transmission mode, and collecting a 1: 5H cell wall phase image in an edge-on state; in a 1: 5H cell wall phase image in an edge-on state, the distance d between the intracellular main phase and the interface of the 1: 5H cell wall phase is measured along the Sm-rich atomic layer of the 1: 5H cell wall phase, and the thickness w of the 1: 5H cell wall phase is calculated, w = d.cos30 degrees. According to the measurement method, interface identification interference caused by projection overlapping of the 1: 5H cell wall phase and the intracellular main phase is effectively eliminated, and accurate measurement of the thickness of the 1: 5H cell wall phase at the atomic scale is realized.

The application discloses a kind of magnetic material encapsulation solvent-free epoxy glue and its preparation method and application, belong to adhesive technical field.The solvent-free epoxy glue is by weight fraction, by 60-75 parts of bisphenol A type epoxy resin modifier, 15-25 parts of composite curing system, 3-8 parts of functional polycarboxylate dispersant, 2-5 parts of thixotropic modifier, 1-3 parts of synergistic aid composition;Through the epoxy resin of gamma-aminopropyl triethoxysilane graft modification constructs magnetic material affinity structure, compound anhydride-amine composite curing system, collocation functional dispersant and silane modified nanocomposite thixotropic agent, combined with gradient mixing, segmented vacuum degassing, in-situ modification dispersion process, realize the synergistic effect of each component.The application solves the problem that the existing magnetic material encapsulation solvent-free epoxy glue is weak, glue flying silk is serious, insulation and weathering performance decays fast, can be used for ferrite, neodymium iron boron, samarium cobalt magnetic material encapsulation, preparation process controllable, suitable for industrialized batch production.

The invention provides a hard magnetic material magnetization device and a weak magnetization control method.The device comprises a constant-speed cruise device, a magnetized object, a track device and a magnetization assembly with the adjustable height, and the constant-speed cruise device is used for carrying a hard magnetic material sample plate to move at a constant speed on a concentric circle track; the magnetizing assembly provides a stable magnetic field and can adapt to materials of different sizes through height adjustment. According to the method, the weak magnetization process of the hard magnetic material is realized by controlling the magnetization time, the movement speed and the magnetic field intensity, and closed-loop feedback control is formed by measuring the surface magnetic field intensity and the residual magnetism intensity after magnetization by means of a gauss meter. The method solves the problems of non-uniform magnetization, low control precision, poor adaptability and the like in the prior art, is suitable for fine magnetization treatment of various hard magnetic materials such as neodymium iron boron, aluminum-nickel-cobalt, samarium-cobalt and the like, and meets the high-precision requirements of the fields of electronic information, new energy, intelligent manufacturing and the like on magnetic performance regulation and control.

To provide a preparation method of a samarium-cobalt permanent magnet with high mechanical properties which not only improves the magnetic properties, but also greatly enhances the mechanical properties of the samarium-cobalt magnet, achieving a synergistic improvement in the magnetic and mechanical properties of the samarium-cobalt magnet.SOLUTION: A method includes the steps of performing melting, pulverizing, orientation shaping, cold isostatic pressing, sintering, solution, aging and heat treatment sequentially on raw materials to obtain a samarium-cobalt permanent magnet. The heat treatment is performed under a protection of an inactive atmosphere. The number of heat treatment cycles ranges from 1 to 10, and an external magnetic field and an external stress are applied during one or multiple heat treatment cycles. The magnetic field intensity of the external magnetic field is 1-50 kOe, and the magnitude of the external stress is 5-500 MPa. Compared to the traditional process, this method not only improves the magnetic properties, but also greatly enhances the mechanical properties of the samarium-cobalt magnet by performing the heat treatment with the external magnetic field and the external stress after the aging process is finished., achieving a synergistic improvement in the magnetic and mechanical properties.SELECTED DRAWING: Figure 1

The invention relates to a processing method for keeping the magnetic field of a samarium cobalt permanent magnet stable, belongs to the technical field of high-precision measurement, and solves the problems of large magnetic field fluctuation and insufficient long-term stability of the samarium cobalt permanent magnet caused by environment temperature change and unstable magnetic domain in the service process in the prior art. The method comprises the following steps: carrying out high-temperature vacuum heat treatment on the sintered samarium-cobalt permanent magnet at the temperature not lower than 800 DEG C for 1-5 hours; magnetizing the permanent magnet to be saturated, and then carrying out heat preservation treatment for 1-2 hours at the temperature of 300-350 DEG C under the protection of inert gas; the permanent magnet is assembled on the magnetic conductive substrate to form a homopolar magnetic field magnetic conductive magnetic circuit; and finally, carrying out heat preservation and magnetism stabilization treatment on the magnetic circuit at the highest use temperature of the permanent magnet for not less than 10 hours. According to the invention, the reversible and irreversible magnetic loss of the samarium-cobalt permanent magnet is obviously reduced, and the ultrahigh stability of the magnetic field in a wide-temperature range and long-period working environment is maintained.