2060 results about "Neodymium iron boron" patented technology

The invention relates to the field of neodymium iron boron magnetic materials, in particular to a high intrinsic coercive force neodymium iron boron magnetic material and a preparation method thereof, and the high intrinsic coercive force neodymium iron boron magnetic material comprises the following raw materials in parts by weight: 52.5-57.2 parts of PrNd, 105-115.3 parts of Nd, 9.0-10.3 parts of B, 15-35 parts of Tb, 70-80 parts of Dy, 10-25 parts of Co and 650-680 parts of Fe. The two rare earth elements Tb and Dy are added into the neodymium-iron-boron magnetic material, so that the magnetocrystalline anisotropy field of the crystal is remarkably enhanced, and the intrinsic coercive force of the neodymium-iron-boron magnetic material is greatly improved.

The invention discloses a production method of a high-performance sintered neodymium-iron-boron magnet. The production method comprises the steps of rapid quenching flaking, hydrogen decrepitation mixing, magnetic field forming, multi-stage treatment and composite coating. A nanocrystalline sheet is prepared through a rapid quenching technology, and uniform distribution of a grain boundary phase and rare earth elements is achieved through hydrogen decrepitation and material mixing; forming in a strong magnetic field and applying high pressure to improve the orientation degree; through high-temperature sintering, medium-temperature annealing and low-temperature aging treatment, magnet densification, grain boundary phase reconstruction and a magnetic domain structure are optimized; and finally, the corrosion resistance is improved by adopting a composite coating. The high-performance sintered neodymium-iron-boron magnet produced by the method comprises a main phase alloy, a grain boundary phase additive and a rare earth supplementary phase. Through low-oxygen nanocrystal preparation, grain boundary coordinated regulation and green process integration, compatibility of high performance, low cost and environmental protection is realized, and sustainable development of the rare earth permanent magnet material is promoted.

The invention relates to the technical field of magnetic materials, in particular to a grain boundary diffusion method of a neodymium-iron-boron rare earth permanent magnet material, which comprises the following steps: preparing a sintered neodymium-iron-boron diffusion matrix, a diffusion source being turbid liquid slurry consisting of a mixture of rare earth fluoride and rare earth oxide and a proper amount of organic solvent; the method comprises the following steps: processing a diffusion substrate into a required size, carrying out grain boundary diffusion treatment after oil removal and acid pickling treatment, coating the surface of the diffusion substrate with a diffusion source, drying the coated magnet, carrying out primary diffusion treatment, and carrying out secondary low-temperature tempering treatment. The diffusion method provided by the invention is simple in process, can effectively improve the coercive force of the neodymium-iron-boron magnet, especially the coercive force of a Ce-containing magnet, and is embodied in the following aspects: improving the anisotropic field of the surface of a crystal grain, improving the microstructure of a crystal boundary, effectively increasing the diffusion depth, obviously improving the coercive force of the magnet, and improving the coercive force of the neodymium-iron-boron magnet. And the original residual magnetism and the maximum magnetic energy product of the magnet are not obviously reduced.

The invention relates to the technical field of thermal management material preparation, solves the technical problems of loose heat conduction network structure and non-uniform heat conduction direction of a flexible composite phase change material, and particularly relates to a magnetic polymer-based flexible composite phase change material and a preparation method thereof. Comprising the following steps: preparing a modified polydimethylsiloxane prepolymer from a carbon nanotube dispersion liquid and a polydimethylsiloxane prepolymer; adopting a Pickering emulsion method to mix 42 # paraffin, the modified polydimethylsiloxane prepolymer and nano cellulose to prepare a composite phase change material emulsion; silver mirror reaction is adopted to carry out surface silver plating on the magnetic neodymium iron boron particles; the magnetic polymer-based flexible composite phase change material is prepared from the composite phase change material emulsion and the surface-silvered magnetic neodymium iron boron particles. The high flexibility and magnetism of the prepared material in a normal temperature state endow the material with a more convenient installation mode and lower contact thermal resistance, the heat conduction network structure and component compatibility of the material are improved, and the application requirements of a phase change thermal management technology can be met.

The invention discloses a neodymium-iron-boron magnet with double main phases and light rare earth diffusion based on asymmetric cerium distribution and a preparation method, and relates to the technical field of neodymium-iron-boron magnets. The method comprises the steps that a diffusion matrix is prepared through a double-main-phase technology, in the double-main-phase technology, the components of a main-phase alloy and an auxiliary-phase alloy are RaCebFe100-a-b-c-dMcBd, R is PrNd alloy or Nd metal, M is at least one of Cu, Al, Zr, Co and Ga, the content of Ce in the main-phase alloy is larger than that of Ce in the auxiliary-phase alloy, then the upper surface and the lower surface of the diffusion matrix are coated with a diffusion source solution, and the diffusion matrix is obtained through heat treatment. Carrying out heat treatment and aging treatment to obtain a neodymium-iron-boron magnet; the diffusion source solution is formed by mixing a diffusion source and a solvent, and the diffusion source is (PrmNdn) aAlbCucZrdCoeMgf. The neodymium-iron-boron magnet obtained through the method has high residual magnetism and high coercive force at the same time, the diffusion efficiency of the diffusion source is high, and the rare earth utilization rate is increased.

The present invention discloses a medium-high performance neodymium iron boron and a preparation method thereof. Through the master-slave phase double alloy process, the master phase alloy is cerium iron boron with a low total rare earth content, and the slave phase is a neodymium iron boron alloy with a high total rare earth content, avoiding the entry of light rare earths in the master phase into the grain boundaries, while the surplus rare earths in the slave phase enter the grain boundaries and are recombined into rare earth-rich phases. The prepared magnet is processed into a thin magnetic sheet, and a low-melting-point HReM alloy is magnetron sputtered, realizing low-temperature grain boundary diffusion. This alloy improves the grain boundary wettability and also improves the fluidity of the rare earth-rich phase, enabling the cerium-containing neodymium iron boron master and slave phase grains to be quickly isolated during grain boundary diffusion. The low-temperature diffusion avoids the replacement of the diffused heavy rare earths by praseodymium, neodymium, and cerium elements, inhibits the exchange coupling between cerium iron boron grains, and makes the heavy rare earths free in the grain boundaries or interact with the rare earth-rich phase to form a core-shell structure on the surface layer of the master phase grains, enabling the rare earth-rich phase to be continuously and uniformly distributed, effectively enhancing the effectiveness of the grain boundary diffusion of heavy rare earth elements in improving the intrinsic coercivity of the cerium-containing magnet.

The invention relates to the technical field of magnetic materials, in particular to a ferrite neodymium iron boron composite magnetic material and a preparation method thereof. The ferrite neodymium iron boron composite magnetic material comprises the following raw materials in parts by weight: 20-30 parts of ferrite magnetic powder, 40-50 parts of neodymium iron boron magnetic powder, 5-10 parts of silicon dioxide, 2-5 parts of carbon nanotubes, 0.5-1 part of polyethylene and 0.5-2 parts of polyimide. The high-temperature-resistant and corrosion-resistant permanent magnet has high magnet performance and also has high-temperature-resistant performance and corrosion-resistant performance.

The invention discloses a neodymium iron boron magnet with a protective film and a manufacturing method thereof, and the manufacturing method specifically comprises the following steps: S1, pretreating a plurality of raw materials to ensure the purity and cleanliness of the raw materials; s2, the pretreated materials are mixed in proportion and smelted to prepare uniform neodymium-iron-boron alloy; s3, the smelted alloy is crushed, and particle powder meeting the requirement is prepared through jet mill equipment; s4, the powder is put into a mold, forming orientation is conducted through a magnetic field press, and the maximum residual magnetism is obtained; s5, performing high-temperature sintering on the molded magnet to improve the density and the magnetic performance of the molded magnet; s6, the sintered magnet is machined, and the needed size and shape are obtained; s7, carrying out pretreatment on the surface of the magnet, and carrying out aftertreatment after chemical nickel plating to ensure the quality of a plating layer; according to the method, the surface of the neodymium-iron-boron magnet is coated with a high-phosphorus chemical nickel layer in a plating mode, the magnet can be effectively prevented from being corroded by the external environment, and the service life of the magnet is prolonged.

The invention discloses an yttrium-rich neodymium-iron-boron magnet and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet material preparation. The preparation method comprises the following steps: mixing yttrium-rich neodymium-iron-boron matrix alloy powder with grain boundary doped alloy powder containing Gd and / or Ho, and carrying out compression molding and sintering tempering treatment to obtain a first yttrium-rich neodymium-iron-boron magnet. According to the invention, the grain boundary doped alloy powder containing Gd and / or Ho is added into the yttrium-rich neodymium iron boron matrix alloy powder and then is sintered, so that a continuous and uniform non-magnetic thin-wall grain boundary phase structure is formed in the grain boundary, and the coercive force of the magnet is enhanced. Dy and / or Tb heavy rare earth element grain boundary diffusion is carried out based on the first yttrium-rich neodymium-iron-boron magnet after grain boundary modification, a second yttrium-rich neodymium-iron-boron magnet is obtained, the diffusion depth of Dy and / or Tb in the magnet can be increased, the utilization rate can be increased, the cost can be reduced, the coercivity of the magnet can be improved, and the adverse effect of Dy and / or Tb on residual magnetism can be reduced.

A preparation and diffusion treatment method for a high-performance diffusion coating used for a sintered neodymium-iron-boron magnet. The method comprises the following steps: the preparation of alloy powders, the preparation of glue, the preparation of a diffusion coating, a pretreatment, coating with the coating, surface drying, and a heat treatment. By controlling the components and particle size of the alloy powders, the compounding of the glue, an anti-bonding powder and an auxiliary agent ensures that under the condition of a relatively small usage amount of a diffusion heavy rare earth metal, the coercive force is greatly improved, the residual magnetism is almost not reduced or is slightly reduced, and the phenomena of the shedding of the coating and the bonding of magnetic sheets after diffusion are avoided.

The invention relates to a soft mesh magnetic sensor for tactile and non-tactile perception. The sensor comprises a neodymium iron boron-organic silicon elastomer magnetic film, an aluminum foil, a PDMS elastomer, a TMR element and a printed circuit board, wherein the TMR element is welded on the printed circuit board, and the PDMS elastomer coats the TMR element and covers the PCB; the PDMS elastomer is covered with an aluminum foil, and a neodymium iron boron-organic silicon elastomer magnetic film is arranged on the aluminum foil; the PDMS elastomer is of a sandwich structure and is composed of an upper thin film, a lower thin film and a middle small cylinder array. The lower film is provided with a strip-shaped groove which is used for wrapping the TMR element. The soft grid magnetic sensor disclosed by the invention has the advantages of high sensitivity, high flexibility and strong multi-mode sensing capability.

The invention discloses a high-performance sintered neodymium-iron-boron magnet and a preparation method thereof.The high-performance sintered neodymium-iron-boron magnet is characterized in that raw materials for preparing the neodymium-iron-boron magnet comprise a main alloy and an auxiliary alloy, and the auxiliary alloy does not contain Fe and Co elements; the microstructure of the neodymium-iron-boron magnet comprises a matrix phase and a rare earth-rich grain boundary phase, the matrix phase is (RE / RE ') 2 (F) 14B, F is Fe and Co, the content of Co is 0-3, the mass percent of Fe to RE / RE' in the rare earth-rich grain boundary phase is 1: (1.4-7), RE is Nd or PrNd, and RE 'is one or more of Pr, Ho, Dy and Tb. The neodymium-iron-boron magnet has relatively high magnet magnetic performance.

The invention belongs to the field of iron high-valued treatment and tailing reduction, and relates to an iron high-valued treatment and tailing reduction recovery method for multi-source neodymium iron boron secondary resources. In order to solve the problems of iron tailing treatment and high-value utilization of iron elements in the secondary resource recovery process of the neodymium iron boron waste, the invention develops a new process of'oxidizing roasting, carbonylation method iron extraction and wet process rare earth recovery ', so that effective extraction of rare earth elements is realized, high-value recovery of iron is promoted, and the generation amount of tailings is reduced. According to the technology, 60%-86% of iron elements in the neodymium iron boron magnetic material waste can be prepared into pentacarbonyl iron with the high additional value, then pentacarbonyl iron can be pyrolyzed to prepare a carbonyl iron powder product, the amount of iron tailings obtained after rare earth leaching is 350-600 kg / t of raw materials, and the output of the iron tailings is only 40%-60% of iron tailings generated after rare earth magnetic materials are recycled through a conventional roasting-hydrochloric acid optimal solution method. The new process can provide powerful guarantee for efficient and high-value utilization of neodymium iron boron waste and tailing reduction.

The invention discloses sintered neodymium-iron-boron magnet grinding machining equipment, and relates to the technical field of neodymium-iron-boron magnet machining, the sintered neodymium-iron-boron magnet grinding machining equipment comprises a machining table, the machining table is provided with a grinding assembly, a clamping assembly, a steering adjusting assembly and a cooling assembly, and the clamping assembly is used for clamping a magnet body; the grinding assembly is used for achieving grinding machining of a magnet body, the steering adjusting assembly is used for achieving rotation of the magnet body and achieving multi-directional machining of the magnet body in a matched mode, and the cooling assembly is used for cooling treatment when the magnet body is machined, so that machining is more stable. A plurality of through grooves are formed in the machining table, and a waste collecting assembly is arranged in the machining table and used for collecting machined waste. The problems that in the prior art, a grinding mechanism is directly driven by a feeding mechanism to conduct grinding, the microstructure of a magnet is easily damaged, and the magnetic performance is reduced are solved.

The invention relates to a high-flux selective diffusion agent and application thereof. The high-flux selective diffusion agent is obtained by mixing heavy rare earth-containing spherical powder and a solid organic binder and then melting and processing; the particle size of the heavy rare earth-containing spherical powder is 10-60 [mu] m, and the sphericity is greater than 85%. According to the method, the heavy rare earth-containing spherical powder with high sphericity degree and good fluidity and the raw material suitable for additive manufacturing are adopted, and the comprehensive magnetic performance of the subsequently prepared magnet can be remarkably improved by strictly controlling the morphology of the heavy rare earth-containing spherical powder. According to the method, the high-flux selected area dispersion technology is combined with the additive manufacturing means, selected area diffusion is conducted on the surface of the neodymium-iron-boron magnet, and the coercive force and high-temperature stability of the neodymium-iron-boron magnet can be greatly improved under the condition that the use amount of heavy rare earth is small. The method is suitable for multi-batch and small-batch production exploration and has the advantages of being high in technological process automation process and short in research and development period.

The invention provides a method for coating slurry on the surface of a sintered neodymium-iron-boron matrix, a preparation method of a sintered neodymium-iron-boron magnet and the slurry. The method for coating the surface of the sintered neodymium-iron-boron substrate with the slurry comprises the steps that the slurry is prepared; wherein the slurry comprises powder containing heavy rare earth elements, an organic solvent and a binder, and the viscosity of the slurry is 2000-5000 mPa.s; and coating the surface of the sintered neodymium-iron-boron substrate with the slurry by adopting a roller coater to form a coating layer. The slurry provided by the invention is low in viscosity, good in flowability, low in thixotropy, low in shear viscosity mutation rate and low in temperature sensitivity, the weight gain uniformity of magnets in each batch and between batches is good, and the coercive force is obviously improved.

The invention relates to a diffusion source for a neodymium-iron-boron magnet and a preparation method and application of the diffusion source. The invention discloses a rare-earth metal catalyst which comprises the following components in percentage by mass: 46%-49% of an organic solvent, 0.1%-2% of an adhesive, 0.1%-5% of a metal oxide and 46%-49% of rare-earth metal, and the melting point of the metal oxide is higher than that of the neodymium-iron-boron magnet. The specific organic solvent, the adhesive, the metal oxide and the rare earth metal are matched for use according to a specific matching relation, so that the diffusion source is more stable, the diffusion effect is improved, and when the magnet attached with the diffusion source is subjected to thermal diffusion treatment, the rare earth metal can be diffused into the magnet so as to improve the coercive force and other properties of the magnet. In the process, the high-melting-point metal oxide is adhered to the surface of the magnet and then serves as a spacer, the adhesion phenomenon of the magnet in the high-temperature sintering diffusion process is reduced or avoided, grain boundary diffusion is further promoted, and the performance of the magnet is improved.

The invention relates to the related technical field of neodymium-iron-boron recovery, in particular to a neodymium-iron-boron waste recovery parameter optimization method and system capable of predicting the recovery rate, and the method comprises the steps: determining a physical characteristic index, simulating and configuring a pyrolysis parameter set in combination with a pyrolysis temperature gradient, uploading an acid leaching concentration parameter, configuring an acid leaching parameter combination, and carrying out coupling analysis and iteration. And collecting parameters to establish a recovery parameter feedback adjustment mechanism. The technical problems that fixed pyrolysis parameters are difficult to adapt to different waste characteristics, the characteristic change of the pyrolyzed waste directly affects the acid leaching efficiency, a compact inert layer is generated on the surface of part of the pyrolyzed waste, and the dissolution bottleneck is caused are solved, the recovery process under different temperature gradients is analyzed, and the recovery efficiency is improved. The method has the advantages that recycling process parameter sets corresponding to different pyrolysis temperature intervals are accurately configured, the coupling relation between acid leaching and pyrolysis is fully considered, it is guaranteed that the dissolution efficiency, the impurity dissolution amount and the reaction rate of rare earth elements under different acid leaching concentrations reach the optimal balance, and the recycling efficiency is improved.

The invention discloses a grain boundary diffusion method of a sintered neodymium-iron-boron magnet. The grain boundary diffusion method comprises the following steps: providing a magnet to be diffused; coating the surface of the magnet to be diffused with coating slurry containing heavy rare earth metal powder, and performing grain boundary diffusion after vacuum heat preservation and dehydrogenation; the vacuum heat preservation dehydrogenation process comprises the steps that under the vacuum condition, the temperature is increased to 220-250 DEG C from the normal temperature after 1-1.5 h, heat preservation is conducted for 2-3 h, then the temperature is increased to 520-560 DEG C after 1-2 h, and heat preservation is conducted for 1-2 h; the grain boundary diffusion process comprises the following steps: heating to 650-750 DEG C after 1-1.5 hours, and preserving heat for 24-30 hours for permeation; and finally, the temperature is increased to 970-1000 DEG C after 1-1.5 h, and heat preservation is conducted for 2-3 h. According to the grain boundary diffusion method, the coercive force of the center part of the sintered neodymium-iron-boron magnet with the high permeation thickness can be remarkably improved, and the intrinsic coercive force gradient difference of the surface layer and the center part of the magnet is reduced.

The invention relates to the technical field of neodymium-iron-boron magnet machining, and discloses continuous cutting equipment for magnetic coupler neodymium-iron-boron magnet machining, which comprises a laser cutting machine body and a material guide mechanism mounted below a blanking groove in the laser cutting machine body, the slide way is obliquely and fixedly installed below the blanking groove in the workbench through a support and used for assisting the cut neodymium-iron-boron magnet in falling, a bearing assembly and a separating mechanism which assist the neodymium-iron-boron magnet in falling onto the slide way are installed in the blanking groove, the separating mechanism comprises an installation plate, and the installation plate is fixedly connected between baffles on the two sides of the slide way. According to the continuous cutting equipment for machining the neodymium-iron-boron magnet of the magnetic coupler, the problems that in the prior art, residual magnetism is left after laser cutting of the neodymium-iron-boron magnet, and due to magnetic interference, cut finished products and waste materials are still adhered due to magnetic force adsorption and are not prone to separation can be effectively solved.

The invention discloses a neodymium-iron-boron magnet and a preparation method thereof. Raw materials of the neodymium-iron-boron magnet comprise a neodymium-iron-boron magnet base body and slurry containing a heavy rare earth element RE '. The component composition of the neodymium iron boron magnet base body is REx (Fe < 100-a > Ma) < 100-x-y > By, wherein RE is at least two of La, Ce, Pr and Nd and certainly contains Pr, and the mass of Pr in RE accounts for 25%-35% of the total mass of RE; m is selected from at least one of Co, Cu, Al, Nb, Ti, Zr and Ga; a, x and y represent numerical values obtained by multiplying the weight percentage of each element by 100, 28.5 < = x < = 31, 0.85 < = y < = 1.02, and 1.9 < = a < = 4.4; rE'is at least one of Pr, Gd, Tb, Dy, Ho and Er. After raw materials are made into neodymium iron boron alloy powder, a neodymium iron boron magnet base body is obtained through magnetic field forming, sintering and aging treatment, then the surface of the magnet base body is coated with slurry, elements in the slurry permeate into the interior from the surface of a flaky magnet through grain boundary diffusion, and the neodymium iron boron magnet is obtained. The use of heavy rare earth elements can be reduced, and meanwhile, the magnetic performance of the magnet is improved.

The invention discloses a sintered neodymium-iron-boron magnet performance prediction method based on data driving, which is used for gradually capturing the influence of process parameters in the production process and gradually predicting the middle and final magnet performance. In the first stage, technological parameters are used as input, the characteristics of powder are predicted through the combined prediction model, and intermediate output characteristics of the first stage are obtained. And in the second stage, training and prediction are carried out again in combination with the process parameters and the powder performance parameters obtained through prediction in the first stage, so that the final performance of the magnet is obtained. Through the multi-stage mode, the model can gradually accumulate and extract the influence of each process link, which is beneficial to reveal the complex mass transfer mechanism of the process. The stage training not only improves the prediction precision, but also enhances the interpretability of the model, so that the key process links can be better identified in the production process, thereby improving the consistency of the product quality and the optimization efficiency of the process flow.

The invention belongs to the technical field of neodymium-iron-boron magnet grinding, and relates to a neodymium-iron-boron magnet chamfering treatment device which comprises supporting frames, a rotating shaft, a discharging disc, a sealing gasket, a driving mechanism and a grinding mechanism, the front supporting frame and the rear supporting frame are arranged, the rotating shaft is rotationally connected between the middles of the two supporting frames, the discharging disc is connected to the middle of the rotating shaft, and the sealing gasket is arranged on the discharging disc. A plurality of containing grooves and grooves which are communicated with one another are evenly formed in the discharging disc in the circumferential direction at intervals, sealing washers are arranged on the grooves, a driving mechanism used for driving the discharging disc to rotate is arranged between the discharging disc and the supporting frame, and a grinding mechanism is arranged on the supporting frame. When the tile-shaped neodymium-iron-boron magnet is ground, the tile-shaped neodymium-iron-boron magnet can be ground through the four conical grinding wheels at the same time while the tile-shaped neodymium-iron-boron magnet is conveyed, the four corners of the tile-shaped neodymium-iron-boron magnet can be ground at a time, and the efficiency of grinding and chamfering the tile-shaped neodymium-iron-boron magnet is higher.

The invention belongs to the technical field of neodymium iron boron rare earth permanent magnets, and relates to a cerium-containing neodymium iron boron magnet with high coercivity and high stability and a preparation method thereof. According to the preparation method, the cerium-containing copper auxiliary alloy and the neodymium iron boron magnetic powder are ingeniously combined, the whole preparation process is optimized, and remarkable technical progress and economic benefits are achieved. Firstly, in the aspect of magnetic performance, Ce in a specific proportion is added into the cerium-containing copper auxiliary alloy, the cerium-containing copper auxiliary alloy is used, the coercive force of a magnet is effectively improved, high residual magnetism is kept to a certain degree, and introduction of Cu is beneficial to refining of grains and improvement of a grain boundary phase structure; therefore, the reverse magnetization resistance in the magnet is enhanced, and the magnet can maintain stable performance in a wider temperature range.

The invention discloses a neodymium-iron-boron magnet detection system for neodymium-iron-boron waste recovery. The neodymium-iron-boron magnet detection system comprises a detection main body and a detection mechanism. A mounting seat, a first rotating part, a second rotating part and a limiting part are arranged in the detection assembly. After the electromagnetic part is electrified, the electromagnetic part is kept to attract neodymium iron boron waste in the bearing seat, so that the limiting part pulls the upper end of the first rotating part to rotate towards the bearing seat, the lower end of the first rotating part is kept to drive the upper end of the second rotating part to reversely rotate, and the second rotating part applies pressure to the pressure applying part; the pressure applying piece transmits pressure to the pressure sensor. According to the neodymium-iron-boron magnet detection system for neodymium-iron-boron waste recovery, the neodymium-iron-boron waste loaded into the bearing seat is clamped through the mechanical arm and is in automatic butt joint with the detection assembly, automatic operation is achieved, and magnetic force detection is conducted on the neodymium-iron-boron waste. Compared with an existing manual detection mode, personal danger of detection personnel is avoided, meanwhile, the labor intensity is reduced, and the detection precision is improved.

The present invention relates to the technical field of powder metallurgy, and in particular to a sintered NdFeB and a preparation method thereof, wherein the heat treatment temperature and time are adjusted to promote the RE6Fe 13 The M phase is generated or disappears, thereby increasing or decreasing the remanence and coercivity of the magnet; specifically, by composition design or adding RE6Fe to the grain boundary 13 The M phase alloy composition is then adjusted to 420‑700°C heat treatment temperature to promote RE6Fe 13 The M phase is formed or disappears. This method can regulate the changes in remanence and coercivity within a certain range to improve the redundancy of the formulation process, and at the same time can better adapt to the different performance requirements of customers, with excellent economic benefits.

The invention discloses a waste crushing device for plastic tableware production, and belongs to the technical field of tableware production, the waste crushing device comprises a main body module, a low-temperature magnetic suction module and a crushing module, the main body module comprises a device shell, the outer surface of the device shell is connected with a protective shell, and the top of the device shell is provided with a feeding hopper; a partition plate is fixedly connected to the interior of the device shell, a collecting box is movably connected to the lower portion of the rear end face of the device shell, and through arrangement of a conveying assembly, a neodymium iron boron magnetic strip, a cooling assembly, a turning assembly, a liquid nitrogen assembly and an air supply assembly, the liquid nitrogen assembly is matched with the cooling assembly, so that melamine tableware is rapidly embrittled, and follow-up smashing is facilitated; meanwhile, the air supply assembly is matched with the cooling assembly to cool the neodymium-iron-boron magnetic strip, the magnetic attraction effect of the neodymium-iron-boron magnetic strip is improved by 20%-50%, and the waste treatment efficiency and the equipment safety are remarkably improved through the cooperation mode of liquid nitrogen cooling and magnetic attraction enhancement.

The invention discloses a sintered neodymium-iron-boron magnet and a preparation method and application thereof. The magnet comprises main phase crystal particles with RE2Fe14B structures and a grain boundary phase. The grain boundary phase comprises a two-particle grain boundary phase between two main phase crystal particles and a grain boundary triple-phase point composed of more than three main phase crystal particle gaps; the ratio of the number of the main phase crystal particles to the number of grain boundary triphase points is smaller than or equal to 3. According to the sintered neodymium-iron-boron magnet, through proper component design, reasonable control over the (Cu + Ga) / X ratio and control over the thickness of an alloy sheet and the ratio relation between the average width of columnar crystals in the alloy sheet and the granularity of magnetic powder, concentrated distribution of grain boundary three-phase points can be effectively restrained, the grain boundary phase proportion can be increased, grain boundary phase distribution can be optimized, and the performance of the sintered neodymium-iron-boron magnet can be improved. Therefore, both high magnetic performance and high impact toughness are achieved. The sum of the magnetic energy product and the coercive force of the sintered neodymium-iron-boron magnet is larger than or equal to 75, the impact toughness of the sintered neodymium-iron-boron magnet is larger than or equal to 20 kJ / m < 2 >, and the sintered neodymium-iron-boron magnet can be applied to new energy automobile motors, energy-saving

The invention relates to the technical field of crucible dust collection, in particular to a dust collection structure for a neodymium iron boron sheet crucible slag removal procedure, which comprises a dust collection pipe, the upper part of the dust collection pipe is tubular, the lower part of the dust collection pipe is conical, and two spraying units which are symmetrically arranged left and right are arranged on the conical structure of the dust collection pipe; the rotatable water pipe is adopted to drive the spray pipes distributed in the circumferential direction to rotate synchronously, cooling water mist is continuously sprayed into the dust suction pipe through the two atomization nozzles on the spray pipes, active cooling is achieved, and the service life of equipment is prolonged; the rotating cylinder is adopted to drive the vortex-line-shaped pushing plate to rotate, raised dust is pushed outwards in the radial direction of the dust suction pipe through the outwards-protruding arc-shaped face of the pushing plate, dust is forced to be close to a spraying area quickly, the mixing efficiency of the raised dust and water mist is remarkably improved, the cooling effect is improved, and the dust removal efficiency is improved.

The invention discloses an integrally sintered neodymium iron boron Halbach ring multi-pole rotating excitation magnetic field press which comprises a rack, a base, a die assembly, an upper die servo electric cylinder mechanism, a lower die servo electric cylinder mechanism, an excitation structure and a rotating excitation device. The base is fixedly arranged on the ground or a working platform; the rack is mounted above the base; the die assembly comprises an upper annular male die, a lower annular male die, a non-magnetic steel female die, a magnetic conductive die core and a die base. The excitation structure comprises an excitation frame, an excitation coil, an excitation pole and a magnetic conductive pole shoe; excitation forming of any even number of poles can be carried out by using a mold of the same size, the requirement for multiple pole numbers is met, the equipment investment is reduced, the production cost is reduced, the production period is shortened, the production flexibility and efficiency are improved, the diversified requirements of different clients and application scenes for the Halbach magnet ring are met, and the production efficiency is improved. The problems that an existing magnetic field press is single in forming pole number and uneven in surface magnetic field distribution are solved, and technical conversion and marketization are promoted.