635 results about "Neodymium" patented technology

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 invention discloses a rare-earth metal arylamine group compound as well as preparation method and application thereof. The invention discloses the rare-earth metal arylamine group compound which is characterized in that a general formula of the rare-earth metal arylamine group compound is (2,6-R12PhNH)5LnLi2(THF)2, wherein Ln is a rear-earth metal selected from one of neodymium, samarium, ytterbium or yttrium; R1 is selected from one of hydrogen, methyl or isopropyl. The rare-earth metal arylamine group compound has the advantages that the rare-earth metal arylamine group compound has a definite structure; raw materials used in the preparation method are simple, easily obtained and cheap; the reaction process is simple and easily operated; the rare-earth metal arylamine group compound product is conveniently purified and the yield of the product is high; the rare-earth metal arylamine group compound has a high activity when acting as a single component catalyst to catalyze a hydrogen phosphine reaction of aldehyde or ketone and phosphite ester; the use amount of the catalyst is less; the yield is high; a substrate has wide universality; a new and simple method is provided for synthesis of a-hydroxyphosphonate.

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.

The invention discloses a method for improving performance of rare earth permanent magnet sintered neodymium iron boron grain boundary diffusion, and belongs to the technical field of rare earth permanent magnet materials. The method comprises the steps that a low-melting-point metal layer and a diffusion layer containing heavy rare earth elements are sequentially formed on the surface of a clean sintered neodymium-iron-boron magnet, and then vacuum diffusion heat treatment and tempering treatment are conducted. Wherein the low-melting-point metal layer comprises at least one of copper, aluminum, gallium and tin or an alloy of the copper, the aluminum, the gallium and the tin; the heavy rare earth element comprises at least one of dysprosium, terbium, holmium and gadolinium. The low-melting-point metal layer is preferentially diffused and wets the grain boundary in the heat treatment process, heavy rare earth elements are promoted to be deeply and uniformly diffused towards the interior of the magnet along the grain boundary, so that a heavy rare earth-rich shell layer is formed outside main phase grains of the magnet, and the intrinsic coercive force is improved; meanwhile, the low-melting-point metal forms a strengthening phase at the grain boundary, the brittleness of the magnet after diffusion is improved, the surface corrosion phenomenon is restrained, and collaborative optimization of the comprehensive performance of the magnet is achieved.

The invention discloses a high-magnetic-performance neodymium-iron-boron magnet and a preparation method thereof, and belongs to the technical field of magnetic materials. The technical problem that an existing magnet is low in magnetic performance is solved. The invention provides a preparation method of a high-magnetic-performance neodymium-iron-boron magnet. The preparation method comprises the following steps: S1, preparing neodymium-iron-boron powder A and neodymium-iron-boron powder B by adopting a vacuum melting method; s2, carrying out powder mixing and orientation compression treatment; s21, powder mixing treatment, wherein the neodymium-iron-boron powder A and the neodymium-iron-boron powder B are mixed, and evenly-mixed neodymium-iron-boron powder is obtained; s22, orientation treatment, wherein the evenly-mixed neodymium iron boron powder is placed in a magnetic field with the magnetic field intensity larger than 2.0 T to be subjected to orientation forming, and a neodymium iron boron blank is obtained; and S3, carrying out sintering treatment and two-stage aging treatment on the prepared neodymium-iron-boron blank to finally obtain the neodymium-iron-boron magnet with high magnetic performance. The residual magnetism of the neodymium-iron-boron magnet prepared by the method disclosed by the invention is 14.21 kGs or above.

The invention discloses a neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and a preparation method thereof, and relates to the technical field of neodymium-iron-boron magnet preparation, and the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet comprises the following preparation raw materials: 170-175 kg of PrNd (praseodymium-neodymium alloy), 25-30 kg of BFe (iron white copper), 1-5 kg of Co (cobalt), 0.1-2 kg of Cu (copper), 1-5 kg of Zr (zirconium), 0.1-1 kg of Ga (gallium) and 380-420 kg of Fe (iron). According to the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet and the preparation method thereof, the 54H sintered neodymium-iron-boron magnet is prepared through a double-alloy technology with neodymium, iron and gallium as auxiliary alloy without adding dysprosium, terbium and other scarce type heavy rare earth elements, and performance optimization and cost optimization of the neodymium-iron-gallium double-alloy heavy-rare-earth-free 54H sintered neodymium-iron-boron magnet are achieved.

This application provides a large-size NdFeB magnet and its preparation method. The preparation method includes: mixing a main alloy powder and an auxiliary alloy powder in a ratio of 10:(1-3) to obtain a mixed alloy powder; molding the mixed alloy powder and then isostatically pressing it to obtain a green blank; sintering the green blank using a multi-stage heating method to obtain a sintered magnet; wherein the multi-stage heating includes: heating to 1000-1100℃ at at least three gradually decreasing heating rates and holding at that temperature for 1-6 hours; and cooling the sintered magnet to obtain a NdFeB magnet. This application, through a dual alloying process and gradually reducing the heating rate during sintering, can effectively suppress cracking of the magnet during sintering and obtain a large-size magnet with excellent magnetic properties.

The invention provides a treatment method for synergistically enhancing the comprehensive performance of a neodymium-iron-boron magnet, and belongs to the technical field of magnetic materials. According to the method, a heavy rare earth layer and a corrosion-resistant metal layer such as copper, nickel and cobalt for promoting grain boundary diffusion of heavy rare earth are respectively deposited on the surface of the neodymium-iron-boron magnet by adopting a multi-layer electroplating method, the coercivity of the neodymium-iron-boron magnet is enhanced through grain boundary diffusion, and the corrosion resistance of the magnet is enhanced through a nickel-cobalt coating. The treatment method comprises the following steps: carrying out electrochemical deposition on the neodymium-iron-boron magnet in a heavy rare earth metal plating solution, and then respectively electroplating a copper plating layer and a nickel-cobalt plating layer to obtain a heavy rare earth-containing plating layer with strong corrosion resistance and good plating film binding force; the neodymium-iron-boron magnet containing the heavy rare earth coating is subjected to heat treatment, and the coercive force of the magnet is improved through heavy rare earth grain boundary diffusion. The neodymium iron boron grain boundary diffusion process and the surface corrosion prevention process are subjected to integrated treatment, the technological process of high-performance neodymium iron boron industrial preparation is shortened, and the coercive force and the corrosion resistance of the magnet are comprehensively enhanced.

The invention relates to the technical field of neodymium-iron-boron magnet gluing, in particular to automatic neodymium-iron-boron magnet stacking and gluing integrated equipment which comprises a rack, a support, a first electric guide rail, a second electric guide rail, a frame and the like. A second electric guide rail is installed on a sliding block of the first electric guide rail, and a frame body is connected to a sliding block of the second electric guide rail. Cylindrical magnets can be fed into the material guide rail through the disc vibration feeder, the cylindrical magnets move into the containing block along the material guide rail to be stacked, glue can be sprayed to the cylindrical magnets through the electric glue head, the cylindrical magnets are glued, the two steps of stacking and gluing can be completed through one piece of equipment, the investment cost can be reduced, and the production efficiency is improved. Meanwhile, the production period can be shortened, and the overall machining efficiency is improved.

The invention relates to the technical field of neodymium-iron-boron magnet production, in particular to a sintered neodymium-iron-boron magnet for preparing lanthanum-cerium-yttrium and a method of the sintered neodymium-iron-boron magnet. In the invention, the cerium element is used for replacing a praseodymium-neodymium alloy, meanwhile, the lanthanum and yttrium elements are introduced according to the proportion to generate a synergistic effect to regulate and control the structure of the high-cerium-content sintered neodymium-iron-boron magnet, the yttrium element is used for inhibiting main phase grain coarsening and improving the coercive force, and the lanthanum and yttrium elements can promote the flow of a rare earth-rich liquid phase in the sintering process and improve the diffusivity, so that the high-cerium-content sintered neodymium-iron-boron magnet is obtained. The density is improved.

The invention discloses a preparation method of a sintered neodymium-iron-boron magnet without heavy rare earth, Pr-Fe-B-M alloy is used as an auxiliary phase alloy, LRe-Fe-B-M alloy is used as a main phase alloy, the auxiliary phase alloy is used for preparing a magnet matrix and performing grain boundary diffusion at the same time, the magnet without heavy rare earth is prepared, praseodymium element is non-uniformly distributed in the magnet, and rare earth element is not uniformly distributed in the magnet. The Pr content of part of the main phase is higher than the overall average content, the crystal boundary praseodymium content is higher than the overall average content, and the magnet surface praseodymium content is higher than the overall average content. The coercive force and the temperature stability of the magnet are improved, the magnet can still keep excellent magnetic performance under the condition that Dy and Tb are not contained, heavy rare earth elements such as Dy and Tb which are scarce in resource and high in price are prevented from being used, the high performance of the magnet is guaranteed, the production cost is reduced, and the resource utilization efficiency is improved.

The invention relates to the field of regenerated magnetic materials, in particular to a process for recycling a regenerated neodymium iron boron magnet from waste neodymium iron boron. The invention discloses a process for recycling and regenerating a neodymium iron boron magnet from waste neodymium iron boron. The process comprises the following steps: preparing Tb-HoBiO3 powder; pretreating the waste neodymium iron boron; pretreating the waste neodymium iron boron to prepare a blank body; and carrying out low-temperature supergravity sintering impurity removal and tempering treatment on the blank. According to the method, the Tb-HoBiO3 powder is prepared, and the Tb-HoBiO3 powder can better promote the uniform transformation of a blocky grain boundary phase into a strip shape and wrap the periphery of a grain main phase in the blank sintering process, so that local stray fields in the main phase grains and the magnet can be isolated, the demagnetization resistance of the regenerated neodymium-iron-boron magnet is remarkably improved, and the service life of the regenerated neodymium-iron-boron magnet is prolonged. Therefore, the magnetic performance of the regenerated neodymium-iron-boron magnet is improved, main phase crystal grains can be effectively prevented from falling off, the density of the regenerated neodymium-iron-boron magnet is improved, microdefects are reduced, the corrosion resistance of the regenerated neodymium-iron-boron magnet is remarkably improved, and the service life of the regenerated neodymium-iron-boron magnet can be prolonged.

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

The application discloses a large-size rare earth permanent magnet material and a preparation method thereof. The preparation method of the large-size rare earth permanent magnet material comprises the following specific steps: pretreating a base magnet blank; performing sputtering treatment on the pretreated magnet; and performing heat treatment on the magnet after the sputtering treatment to obtain the required rare earth permanent magnet material. The application provides a batch preparation method suitable for large-size (width greater than 20 mm) sintered neodymium-iron-boron permeation. The application is used to improve the magnet performance, on one hand, the product performance can be effectively improved (compared with the base magnet blank, the coercive force is increased by 6930Oe-9990Oe, and the remanence is reduced by 220Gs-340Gs), on the other hand, the batch product with qualified appearance and meeting the performance requirements can be output, and the burr defects of the large-size product can be avoided.

The invention belongs to the field of neodymium-iron-boron material processing, and particularly relates to a neodymium-iron-boron product wire-withdrawing-free cutting device and method. The device comprises a base, the base is connected with a multi-wire cutting machine, at least one grooved wheel set is arranged on the side face of the multi-wire cutting machine, a sliding module is installed on the base, the sliding module is connected with a lower fixing plate and drives the lower fixing plate to move, and a pressing mechanism is arranged above the lower fixing plate. The end of the pressing mechanism is connected with an upper pressing tool, and the end of the lower fixing plate is connected with a lower pressing tool. The wire net composed of the diamond wires on the surface of the grooved wheel set is arranged on the side face of the multi-wire cutting machine, after material cutting is completed, the cutting device can directly fall into a discharging platform after being loosened, the diamond wires do not need to retreat from cut wire seams, wire breakage possibly caused by wire retreating is eliminated, and automatic circulating reciprocating cutting can be achieved.

This invention provides a method and application for NdFeB grain boundary diffusion. The method includes: magnetizing diffusion source alloy powder to impart different magnetic properties; spontaneously and uniformly adsorbing the different magnetic properties of the diffusion source alloy powder onto the surface of a NdFeB magnet, forming a multi-layered diffusion source alloy layer; and then subjecting it to diffusion treatment, allowing the multi-layered diffusion source alloy powder to work synergistically and diffuse into the interior of the NdFeB magnet. The diffusion source alloy forms a shell structure on the surface of the NdFeB grains, resulting in a high-performance NdFeB magnet. This invention forms a multi-layered diffusion source alloy layer on the magnet surface through spontaneous adsorption. Thermal diffusion allows the alloy powder to fully penetrate into the magnet and bond with the surface of the NdFeB grains, thereby increasing the penetration depth of the diffusion source alloy and resulting in a significant diffusion effect, further improving the magnetic properties of the magnet. The preparation method is simple and suitable for large-scale application.

The invention discloses a neodymium-iron-boron magnet and a preparation method thereof, and the neodymium-iron-boron magnet comprises the following components in percentage by mass: 29.0 to 33.0 percent of R, 0.89 to 1.1 percent of B, 0.1 to 5.0 percent of M, and the balance of T and inevitable impurities. Wherein R is at least one of Nd, Pr, Ho, Ce, Gd, La, Dy and Tb, M is at least one of Al, Cu, Ga, Zr, Ti, Nb, Zn and Mn, and T contains Fe and Co; the neodymium-iron-boron magnet further comprises exogenously-added nanometer second-phase particles, the nanometer second-phase particles are oxides of high-melting-point elements, and the average particle size of the surface area of the nanometer second-phase particles ranges from 80 nm to 300 nm. According to the neodymium-iron-boron magnet, through reasonable design of main components and multi-element addition, collaborative optimization of magnetic performance and mechanical performance is achieved.

The utility model discloses neodymium-iron-boron magnet sintering and cooling equipment, which belongs to the technical field of neodymium-iron-boron preparation and comprises a furnace body, a conical sleeve is fixedly arranged at a first end of the furnace body, an air inlet communicated with the furnace body is axially arranged on the conical sleeve, and the air inlet is hermetically connected with a driving mechanism through a first pipeline. The output end of the driving mechanism is fixedly connected with a conical plate matched with the conical sleeve through a connecting shaft, the connecting shaft is slidably arranged in the air inlet, the diameter of the connecting shaft is smaller than that of the air inlet, the first pipeline is connected with a cooling mechanism through a pipeline, and the cooling mechanism is connected with an air blowing mechanism through a pipeline. And the blast mechanism is hermetically connected with the air outlet at the second end of the furnace body through a pipeline. Through the arrangement of the conical plate, cooling gas blown into the furnace body diffuses and is blown into the neodymium iron boron product in the circumferential direction, the phenomenon that the product and the cooling gas are fractured due to huge temperature difference caused by direct blowing of the cooling gas is avoided, and the uniformity of the cooling gas entering the furnace body is improved.

The invention discloses a sintered neodymium-iron-boron permanent magnet material with a low coercive force temperature coefficient for a new energy automobile, and relates to the technical field of sintered neodymium-iron-boron permanent magnet materials. Collaborative optimization of high residual magnetism and high coercive force is realized through preparation of the sintered neodymium-iron-boron permanent magnet material; the performance bottleneck of a traditional sintered neodymium-iron-boron magnet material is broken through, and the energy density and the demagnetization resistance of the magnet are doubly improved, so that the magnet is excellent in high-temperature and high-intensity magnetic field environments.

The invention discloses a method for improving the surface performance of a bonded neodymium-iron-boron magnet, which comprises the following steps: injecting glue into a vacuum infiltration tank, putting a workpiece into the vacuum infiltration tank, carrying out vacuum pressure maintaining on the vacuum infiltration tank, releasing the pressure after the pressure maintaining is completed, taking out the workpiece, carrying out multi-stage cleaning on the workpiece, carrying out first-time hanging on the workpiece by utilizing a hanging tool, and carrying out second-time hanging on the workpiece by utilizing a hanging tool. The method comprises the following steps: carrying out pretreatment on a workpiece and a hanger, putting the hanger loaded with the workpiece into a first electrophoresis tank, carrying out first electrophoresis treatment to form a first surface coating, adjusting the contact position of the workpiece and the hanger, keeping away from the original contact point position, and carrying out second mounting and hanging on the workpiece; and the workpiece is put into a second electrophoresis tank to be subjected to second electrophoresis treatment so as to form a second surface coating. The invention provides a method for improving the coating quality of a bonded neodymium-iron-boron magnet so as to improve the surface performance of the bonded neodymium-iron-boron magnet.

This invention relates to a neodymium iron boron (NdFeB) magnet and its preparation method, comprising the following steps: providing NdFeB pre-formed magnetic powder; mixing the NdFeB pre-formed magnetic powder with alloy powder to obtain a mixed powder, and subjecting the mixed powder to hot pressing sintering and hot deformation treatment to obtain the NdFeB magnet. The alloy powder contains at least one of Cu or Al elements, heavy rare earth elements, light rare earth elements, and Ga elements, with the atomic percentage of heavy rare earth elements in the alloy powder being less than or equal to 45%. This preparation method can improve the utilization rate of heavy rare earth elements, thereby effectively improving the coercivity and temperature stability of the iron boron magnet with less heavy rare earth elements, thus reducing the amount of heavy rare earth elements used and lowering the raw material cost of the NdFeB magnet.

The application discloses a preparation method of a lanthanum-cerium-added neodymium-iron-boron magnet, and belongs to the field of magnet preparation. According to a certain element proportion, R1 and R2 alloys are prepared by using a vacuum spinning belt furnace. After the two kinds of alloys are subjected to hydrogen treatment, two kinds of powders with different particle sizes are respectively obtained, the two kinds of powders are mixed according to a certain proportion, and the magnet is obtained through the processes of forming and orientation, cold isostatic pressing, sintering and aging. The magnet prepared by the method has high performance.

The application relates to the technical field of magnetic materials, in particular to a preparation method of high-performance heavy-rare-earth-free neodymium iron boron magnets; the preparation method comprises the following steps: rapidly quenching a main phase alloy into a flake, obtaining coarse powder after hydrogen breaking; immersing the coarse powder in an ethanol mixed solution containing lanthanum nitrate and cerium nitrate, drying the pretreated coarse powder after ultrasonic-magnetic stirring cooperative treatment; adding an antioxidant and a lubricant into the pretreated coarse powder, preparing fine powder with an average particle size of 2-3.5 microns through airflow milling; performing magnetic field orientation compression molding on the fine powder under nitrogen protection, improving the density through cold isostatic pressing; finally, performing vacuum sintering and step-by-step tempering treatment to obtain the high-performance heavy-rare-earth-free neodymium iron boron magnets; wherein the main phase alloy is composed of the following components with mass percentage: 28-31wt.% Pr25Nd75, 0.88-1.2wt.% B, 0-0.1wt.% Al, 0.05-0.3wt.% Ti, 0.05-0.4wt.% Cu, 0.5-1.4wt.% Co, 0.1-0.4wt.% Ga, and the balance is Fe; the prepared neodymium iron boron magnet has the dual characteristics of high coercivity and high remanence, and effectively guarantees the performance and quality.

The application discloses a composite patch for promoting hair growth, a hair growth cap and a preparation method. The composite patch for promoting hair growth comprises the following raw materials in parts by weight: medical grade liquid silicone 40-60 parts, gelatin 20-35 parts, silane coupling agent 1-2 parts, far infrared ceramic powder 1-2 parts, tourmaline powder 1-2 parts, chisel stone powder 0.5-1.5 parts and neodymium-iron-boron magnetic powder 4-6 parts. The composite patch for promoting hair growth is prepared by selecting the raw materials, so that the composite patch has the functions of radiating far infrared, generating a micro electric field and a magnetic field and having weak negative electric characteristics at the interface to improve the directional migration of calcium ions, thereby achieving the purposes of improving the micro environment of hair follicles and promoting hair growth.

This application provides a neodymium iron boron magnet and its preparation method. The method includes: cutting a heavy rare earth-free magnet into a substrate with a predetermined size, wherein the composition of the heavy rare earth-free magnet is Pr and Nd for LRE, and one or more elements selected from Cu, Ga, Ti, Zr, Al, Co, and Nb, and the size of the substrate in the diffusion direction is less than or equal to 3 mm; pre-diffusion treatment of the substrate using a pre-diffusion source to obtain a pre-diffusion substrate, wherein the composition of the pre-diffusion source is as follows; preparing a diffusion slurry using a diffusion source alloy, wherein the composition of the diffusion source alloy is one or two elements selected from Dy and Tb for HRE, and one or more elements selected from Al, Cu, and Ga; and diffusion treatment of the pre-diffusion substrate using the diffusion slurry to obtain the neodymium iron boron magnet. By pre-diffusion and controlling the composition and content of the diffusion source alloy, the heavy rare earth elements diffuse only on the magnet surface during diffusion treatment, thus achieving both high remanence and high coercivity.

The application relates to the technical field of fluorine-containing wastewater treatment equipment, and discloses a fluorine-containing wastewater treatment device for praseodymium neodymium fluoride rare earth processing, which comprises a wastewater treatment tank, the top of the wastewater treatment tank is provided with a water inlet valve; a filtering and cleaning device comprises a water conveying pipeline vertically penetrating through the middle part of the top end of the wastewater treatment tank, the top end of the water conveying pipeline is communicated with the water inlet valve, the bottom of the water conveying pipeline is circular, uniform and horizontally provided with a plurality of water filtering channels, the bottom of each water filtering channel and the side far away from a water receiving disc are provided in an open mode, the bottom of the water filtering channel is covered with a first filter membrane, and the side far away from the water receiving disc of the water filtering channel is covered with a second filter membrane; when fluorine ions in fluorine-containing wastewater are separated and filtered through a filter membrane assembly, the filter time is effectively prolonged, the separation effect of the fluorine ions is improved, the surface of the filter membrane assembly is cleaned, and the effect of rare earth impurities on the membrane holes of the filter membrane is avoided.

The application relates to the field of alloy defect detection, and specifically discloses a praseodymium-neodymium alloy nondestructive detection method and system based on acoustic feature analysis, which comprehensively captures defect information contained in an original probe signal from two complementary physical perspectives of instantaneous dynamic characteristics and frequency band energy distribution by simultaneously adopting Hilbert-Huang transform and wavelet packet transform. Further, the scheme discards simple feature splicing, and instead utilizes canonical correlation analysis as an information decoupling tool to online decompose two groups of original feature vectors into a shared part describing defect commonality and unique information parts respectively representing the unique resolution capabilities of HHT and wavelet packet. Finally, the three decoupled components are structurally recombined to form a fusion feature vector which can effectively eliminate redundancy, amplify differences and has higher information density, thereby providing a clear structure and highly refined input for a subsequent classification model.

The invention belongs to the technical field of functional crystal materials, and discloses a neodymium-doped forsterite crystal, the chemical formula is Nd < 3 + >: Mg2SiO4, and the doping concentration range of Nd < 3 + > is 0.05 at%-0.2 at%. The preparation method of the neodymium-doped forsterite crystal comprises the following steps: S1, loading a synthesized Nd < 3 + >: Mg2SiO4 raw material into an iraurita crucible; s2, installing a zirconium oxide temperature field and an iraurita crucible in the single crystal furnace, and filling oxygen to inhibit decomposition and volatilization of the raw materials; and S3, melting the raw materials, carrying out constant-temperature treatment, selecting seed crystals for seeding, enabling the crystals to grow to a set length size in an equal-diameter manner until the crystals are separated from the melt after the growth is finished, and annealing in the crucible to obtain the large-size single crystals. The neodymium-doped forsterite grown by the method disclosed by the invention can still keep a stable structure in a lunar vacuum and extreme temperature environment, is not easy to oxidize or change phase, is suitable for being used as a standard sample for a long time, and can be used for calibrating a Raman spectrometer through specific wavelength and intensity signals.

The application provides a special-shaped neodymium-iron-boron polishing device, and belongs to the technical field of neodymium-iron-boron processing. The device comprises a workbench, a mounting seat fixedly arranged on the workbench, an X-axis displacement assembly assembled on the mounting seat, a support frame connected to the execution end of the X-axis displacement assembly, a Y-axis displacement assembly assembled on one side of the support frame, a connecting seat connected to the execution end of the Y-axis displacement assembly, a Z-axis displacement assembly assembled on the connecting seat, a first spindle box fixedly connected to the execution end of the Z-axis displacement assembly, a grinding head connected to the output end of the first spindle box, and a fourth motor drivingly connected to the power input end of the grinding head. A second spindle box corresponding to the position of the first spindle box is fixedly arranged on the workbench, and a disc is coaxially fixedly connected to the output end of the second spindle box. The device eliminates the cumbersome steps of workpiece overturning, reloading and secondary positioning in the traditional process, greatly shortens the single-batch processing period, and effectively improves the batch production efficiency of the arc-shaped neodymium-iron-boron workpiece.