534 results about "Praseodymium" patented technology

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 belongs to the technical field of catalysts, and relates to a surface-reconstructed heterojunction catalyst and a preparation method and application thereof. The preparation method comprises the following steps: dissolving cobalt salt, ferric salt and praseodymium salt in deionized water, heating and spraying on a carrier to prepare praseodymium-doped ferrocobalt layered double hydroxide; mixing the praseodymium-doped ferrocobalt layered double hydroxide with a phosphorus source, and calcining in an inert atmosphere to prepare praseodymium-doped CoP / Fe2P; and carrying out electrooxidation treatment on the praseodymium doped CoP / Fe2P, so as to prepare the Pr6O11 cluster modified CoFeOOH heterojunction catalyst. Through cooperation of three technologies of spray thermal deposition, phosphating and electrooxidation, stable construction and electrochemical activation of a heterogeneous interface are realized, the corrosion resistance and chlorine evolution resistance competitive capacity of the catalyst in a chlorine-containing alkaline system are remarkably improved, the current density of 100 mA. Cm <-2 > can be achieved only through 223 mV overpotential, and meanwhile, stable operation is performed for 500 h.

The invention provides a hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium, a preparation method of the hydrogen production electrode and a water electrolysis hydrogen production device, and relates to the field of water electrolysis hydrogen production. The preparation method of the hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium comprises the following steps: coating the surface of a conductive substrate with mixed powder; the conductive base material coated with the mixed powder is subjected to thermal oxidation treatment, the mixed powder comprises first metal powder, second metal powder and a pore forming agent, the first metal powder comprises Ni powder, and the second metal powder comprises Pt powder, Ru powder, Sn powder and Pr powder; and putting the structure subjected to thermal oxidation treatment into an alkaline solution, and activating to obtain the hydrogen production electrode doped with platinum, ruthenium, tin and praseodymium. The platinum, the ruthenium, the tin and the praseodymium are introduced into the hydrogen production electrode, so that the hydrogen evolution overpotential can be reduced. The hydrogen production electrode prepared by the method disclosed by the invention has relatively high catalytic activity, relatively high stability and a uniformly distributed porous structure, the electrolytic efficiency can be remarkably improved, and the service life of equipment is prolonged.

The present application relates to the technical field of tungsten alloy materials, and in particular to a tungsten alloy wire, a preparation method therefor, and a use thereof in cutting of a semiconductor material. The tungsten alloy is composed of the following elements in percentage by mass: 0.4-1.1 wt% of L, 0.001-0.25 wt% of Z, and the balance of tungsten and inevitable impurities, wherein L is one or more than two of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium, and Z comprises oxygen and carbon. The wire diameter of the wire is 20-60 μm, the wire contains linear L or a compound of L along the wire axis direction, and the radial average width D of L or the compound of L is smaller than or equal to 5 nm. According to the present application, the linear L element is doped between tungsten base bodies, and the radial average width of L is controlled to be smaller than or equal to 5 nm, so that the wire has the tensile strength of 5000 MPa or above under the wire diameter of 20-60 μm, and the machining performance of the tungsten alloy wire is enhanced.

The invention provides multi-element alloy silver-free copper-based brazing filler metal and a preparation method thereof.The brazing filler metal comprises, by mass, 30%-40% of zinc, 4%-11% of manganese, 1%-4% of tin, 0.2%-0.6% of silicon, 0.2%-1% of rare earth elements and the balance copper, the rare earth elements comprise cerium, praseodymium and rhenium, and the mass ratio of cerium to praseodymium to rhenium is (0.8-1.2): (0.8-1.2): (0.6-1.0). According to the multi-element alloy silver-free copper-based brazing filler metal, the performance of a brazed joint is improved, the strength, toughness, fatigue resistance and the like of the joint are improved, and the reliability and stability of connection under various working conditions are ensured.

The invention relates to cerium dioxide and a preparation method and application thereof, and the preparation method of the sphere-like cerium dioxide comprises the following steps: (1) carrying out first mixing on cerium salt, doped metal salt, a solvent, inorganic acid and organic acid to obtain a first mixture; the doped metal salt comprises praseodymium salt and / or neodymium salt; (2) under a hydrothermal condition, carrying out second mixing on the first mixture, ammonia water and ammonium salt to obtain a second mixture with the pH value of 8-10, and carrying out sol-gel reaction to obtain sphere-like cerium dioxide sol; and (3) carrying out post-treatment on the sphere-like cerium dioxide sol to obtain the sphere-like cerium dioxide. According to the preparation method of the sphere-like cerium dioxide, provided by the invention, a mixing process and a reaction process of cerium salt and specific raw materials are designed, so that the sphere-like cerium dioxide with regular particle shape, good size uniformity and high purity and crystallinity is obtained.

The present invention relates to the technical field of tungsten alloy materials, and in particular to a tungsten alloy wire, and a preparation method therefor and a use thereof. The tungsten alloy is composed of the following elements in percentage by mass: 0.45-0.9 wt% of L, 0.05-0.2 wt% of oxygen, and the balance being tungsten and inevitable impurities, wherein L is one or more of lanthanum, cerium, praseodymium, neodymium, gadolinium, and samarium, the wire has a wire diameter of 20-60 μm, in the wire, L or compounds of L exist in the axial direction of the wire in a linear shape, and the average width D of L or the compounds of L in the radial direction is less than or equal to 5 nm. The element L is controlled to be doped between the tungsten base materials in a linear shape, and the average width D of L in the radial direction to be less than or equal to 5 nm, so that cracks and wire breakage caused by second-phase particles in the subsequent pressure machining process are greatly reduced, thereby guaranteeing the mechanical strength of the tungsten alloy wire, and thus the wire has a tensile strength of 5000 MPa or above under a wire diameter of 20-60 μm, and the machining performance of the tungsten alloy wire is enhanced.

The invention relates to an ultra-high-purity silver target material and a preparation method thereof, and belongs to the field of target materials, and the ultra-high-purity silver target material comprises the following raw materials in percentage by weight: 99.99% of high-purity silver, 0.05%-0.15% of palladium, 0.025%-0.075% of iridium, 0.1%-0.3% of neodymium and 0.1%-0.3% of praseodymium. According to the ultra-high-purity silver target material and the preparation method thereof, 5N-grade high-purity silver is adopted as a base material, trace palladium, iridium, neodymium, praseodymium and other elements are accurately added, the purity of the target material is remarkably improved and exceeds the purity range in the prior art, the hardness, strength and abrasion resistance of the target material are optimized through the innovative material design, and the service life of the target material is prolonged. The compact uniformity of the material is effectively improved and the internal stress is eliminated through grain refinement and multi-stage heat treatment, in addition, the isotropy of the target material is enhanced through the multi-directional forging process, the consistency of the performance in different directions is ensured, the mechanical performance of the target material is remarkably improved through the improvements, the target material can better adapt to the application environment with the high wear resistance requirement, and the service life of the target material is prolonged. And meanwhile, the conductivity, the reflectivity and the uniformity of a thin film prepared by using the target material are improved.

The present application provides an entropy-regulated composite dielectric film, which comprises a polymer matrix; and fillers dispersed in the polymer matrix, wherein the fillers comprise Bi 4‑a M 1a Ti (3‑3b) M 2b O 12 , wherein M1 comprises at least one of lanthanum, neodymium, samarium and praseodymium, M2 comprises at least one of zirconium, hafnium and tin, 0 The entropy-regulated composite dielectric film has high temperature resistance, high breakdown strength, high polarization strength, high energy storage density and good stability.

The invention relates to the technical field of lithium ion batteries, in particular to a diaphragm material for a lithium battery and a preparation method of the diaphragm material. Comprising a base film and a modified nano TiO2 coating, the modified nano TiO2 coating is arranged on at least one side surface of the base film, and the modified nano TiO2 coating comprises the following raw materials in parts by weight: 55-80 parts of a modified nano TiO2 composite material, 8-24 parts of a binder and 2.5-7.5 parts of a dispersant; the modified nano TiO2 composite material is prepared by taking cellulose nanocrystals, lanthanum zirconate and rare earth praseodymium as modifiers and nano TiO2 as a raw material, the mass ratio of the cellulose nanocrystal to the lanthanum zirconate to the rare earth praseodymium is (1-5): (2-3): 1. By adding the modified nano TiO2 composite material and introducing nano particles into the diaphragm, a three-dimensional network structure is formed, the liquid absorption property and the ionic conductivity of the diaphragm are improved, and meanwhile, the diaphragm is high in air permeability and relatively good in mechanical property and ionic conductivity.

The invention relates to the field of abrasive materials, in particular to an efficient grinding diamond abrasive material and a preparation process thereof.The efficient grinding diamond abrasive material is prepared by coating diamond micro-powder for multiple times to prepare composite diamond micro-powder, then blending the composite diamond micro-powder with electrolytic copper powder, filler, a wetting agent and modified polyvinyl alcohol to obtain slurry, and conducting freezing-unfreezing gel forming to obtain the efficient grinding diamond abrasive material. The prepared diamond grinding material is good in water resistance and efficient in grinding; the preparation method comprises the following steps: depositing a tungsten coating on the surface of diamond micro-powder, then carrying out vacuum high-temperature treatment to obtain pretreated diamond micro-powder with a tungsten carbide layer growing in situ on the surface, generating a silicon oxide layer on the pretreated diamond micro-powder by using tetraethoxysilane, and then generating praseodymium-doped cerium oxide nanoparticles on the surface of the modified diamond micro-powder by using a homogeneous precipitation method; the preparation method comprises the following steps: carrying out chain extension treatment on a prepolymer generated by polytetrahydrofuran ether glycol and 4, 4 '-dicyclohexylmethane diisocyanate by using a silicon-containing chain extender to obtain a polyurethane prepolymer, and then modifying polyvinyl alcohol by using the polyurethane prepolymer and phenolic resin.

The invention discloses a praseodymium-copper heterogeneous catalyst for synthesizing a multi-carbon alcohol product through efficient electroreduction of carbon dioxide and a preparation method of the praseodymium-copper heterogeneous catalyst. The praseodymium-copper heterogeneous catalyst is a composite material of praseodymium oxide and copper oxide, and praseodymium, copper and oxygen are uniformly distributed in the praseodymium-copper heterogeneous catalyst; the praseodymium oxide is an oxide with the praseodymium-oxygen molar ratio of 6: 11; the molar ratio of praseodymium to copper is not less than 2. The invention provides a method for preparing a multi-carbon alcohol product by electrocatalytic reduction of carbon dioxide, which comprises the following steps: by taking a mercury / mercuric oxide electrode as a reference electrode, a foamed nickel electrode as a counter electrode and a praseodymium-copper heterogeneous catalyst as a working electrode, carrying out electrochemical reduction in a gas diffusion type flowing electrolytic tank to obtain the multi-carbon alcohol product. The praseodymium-copper heterogeneous catalytic material is designed, and the interaction relationship between metal and a carrier and between the metal and the carrier and a reaction intermediate in the catalyst is adjusted by introducing the rare earth element praseodymium, so that the reaction activity and the target product selectivity are improved.

The invention relates to a PVB (polyvinyl butyral) composite film as well as a preparation method and application thereof. The PVB composite film is prepared from the following raw materials in parts by weight: 100 parts of PVB resin, 1-10 parts of nano praseodymium oxide, 1-10 parts of a dispersing agent, 0.01-1 part of a coupling agent and 20-50 parts of a plasticizer. The nano praseodymium oxide is added into the PVB resin, and the infrared absorption band of the PVB composite film is optimized by utilizing the infrared absorption performance, chemical stability and heat-resistant stability of the nano praseodymium oxide, so that infrared radiation can be efficiently blocked, and the excellent heat insulation effect and long-term use stability of the PVB composite film are realized. Furthermore, the nano praseodymium oxide is modified by a coupling agent, so that the dispersion uniformity of the nano praseodymium oxide in the PVB resin and the interface bonding force of the nano praseodymium oxide and the PVB resin are improved, the light transmittance loss of the PVB composite film is reduced, and the mechanical property and the heat insulation property of the composite film are improved.

The invention discloses a catalyst for hydrogen production through ammonia decomposition under mild conditions and preparation and application thereof, regular octahedral magnesium oxide is adopted as a carrier, a small amount of metal salt, a structure auxiliary agent, a pore forming agent and an adhesive are added in the preparation process, and the integral catalyst for hydrogen production through ammonia decomposition is obtained through the steps of mixing, ageing, extruding, drying and the like. The catalyst comprises the following components in percentage by mass: 55-99.87% of MgO, 0.1-5% of Ru and 0.01-5% of SiO2, and contains one or more of the following metal components: 0.1-25% of Me1 (Me1 is one or more of lanthanum, cerium, praseodymium, neodymium, samarium, gadolinium, ytterbium, molybdenum, iron, cobalt and nickel) and 0.02-10% of Me2 (Me2 is one or more of lithium, sodium, potassium, rubidium and cesium). The catalytic reaction conditions are mild, and the ammonia conversion rate of the ammonia decomposition hydrogen production reaction is higher than 99% within the working temperature range of 400-600 DEG C.

The invention relates to the technical field of tungsten alloy materials, in particular to a tungsten alloy wire, a preparation method thereof and application of the tungsten alloy wire in semiconductor material cutting, and tungsten alloy is composed of the following elements of, by mass, 0.4-1.1 wt% of L, 0.001-0.25 wt% of Z and the balance tungsten and inevitable impurities. Wherein L is one or more than two of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium; z comprises oxygen and boron; the wire rod has a wire diameter of 20-60 [mu] m, the wire rod has a linear L or L compound in the axial direction, and the radial average width D of the L or L compound is less than or equal to 5 nm. The linear element L is doped between the tungsten matrixes, and the radial average width of the element L is controlled to be smaller than or equal to 5 nm, so that the wire has the tensile strength of 5000 MPa or above under the wire diameter of 20-60 microns, and the machining performance of the tungsten alloy wire is enhanced.

The invention relates to the technical field of rare earth electrolytic metallurgy, and discloses a praseodymium-neodymium alloy low-temperature electrolysis cell voltage optimization method and system.The method comprises the steps that multi-parameter coupling analysis is conducted on an electrolytic cell low-temperature electrolysis initial parameter set, and key influence factors are obtained; carrying out correlation analysis on the key influence factors by combining fluctuation characteristics of the cell voltage to obtain an influence weight sequence; determining a collaborative adjustment scheme of the polar distance and the current density according to the weight sequence; the cell voltage is synchronously adjusted based on the collaborative adjustment scheme, and accurate control over the two is achieved; the operation parameters of the electrolytic cell are collected and integrated to obtain a feedback parameter set, the feedback parameter set is fed back to a correlation analysis link to optimize the key influence factor identification precision, and finally a cell voltage optimization scheme is obtained. The technology can accurately identify the key influence factors, dynamically adapt to the operation change of the electrolytic cell, improve the stability of the cell voltage, reduce energy consumption and cost, and improve the efficiency of cell voltage optimization. The production efficiency and the product quality are ensured.

The invention relates to the technical field of rare earth permanent magnet materials, in particular to permanent magnet alloy powder, a preparation method thereof, a prepared permanent magnet and a method. Wherein the permanent magnet alloy powder and the permanent magnet alloy comprise the following components: REa (La1-mCems) b-Feba-Mc-Tn-Bd, and RE is at least one of Pr, Nd, Sm, Y, Gd, Tb, Dy, Ho and Yb; m is at least one of Zr, Nb, Mo, Hf, Mn, Ta and W; t is at least one of Cr, V, Si and Ti; wherein 0 < a < = 2.0, 11 < = b < = 13.5, 0 < = c < = 1.5, 6 < = d < = 8.1, 0 < = m < = 1, and 0 < n < = 3.0. According to the permanent magnet alloy powder, lanthanum and cerium are adopted to replace part of precious rare earth elements to prepare the permanent magnet alloy powder, the cost can be greatly reduced, the oxidation resistance is improved and the flammability is reduced through a small amount of refractory metal M and antioxidant reinforced metal T matched elements, and the problem that a pure praseodymium neodymium-lanthanum cerium / cerium-based iron boron material is poor in temperature resistance and oxidation resistance is solved.

The invention discloses porous chlorine dioxide slow-release preservative paper and a preparation method thereof.The porous chlorine dioxide slow-release preservative paper comprises a paper base, a porous carrier is fixed to the paper base through oxidized starch glue, and sodium chlorite, an activating agent and a stabilizing agent are loaded on the porous carrier; the porous carrier is one of aluminum oxide, titanium oxide, cobalt oxide, zinc oxide, copper oxide, iron oxide, cerium oxide, zirconium oxide, nickel oxide, manganese oxide, praseodymium oxide and lanthanum oxide with a porous structure. The slow release of chlorine dioxide can be stably and effectively realized, the release period of chlorine dioxide is prolonged, and long-acting stable sterilization and disinfection effects are realized.

The invention relates to the technical field of rare earth metal separation, and particularly discloses a praseodymium neodymium oxide separation and purification process and a regeneration system. The process comprises the following steps: after H2S is subjected to impurity removal and filtration, carrying out multi-stage counter-current extraction by adopting a P507 / TRPO synergistic extraction organic phase, carrying out graded reverse extraction on praseodymium by HCl, and carrying out reverse extraction on neodymium by HNO3; the regeneration system comprises a wastewater treatment unit and an organic phase regeneration unit, wastewater is recycled through neutralization precipitation, precision filtration and reverse osmosis, and an organic phase is subjected to alkali washing, acid activation and 4A molecular sieve dehydration circulation. The praseodymium-neodymium separation coefficient reaches 2.0-2.2 through synergistic extraction, and the stage number is reduced by 40%; the double regeneration systems reduce the organic phase loss to be less than or equal to 2% and the wastewater reuse rate to be greater than or equal to 92%; the purity of the prepared neodymium oxide is greater than or equal to 99.99% and Fe is less than or equal to 10ppm. According to the method, the extraction efficiency is remarkably improved, the service life of an organic phase is multiplied, the product purity breaks through the limit, near-zero wastewater discharge is closed, the whole process stability is guaranteed, and the resource utilization rate is maximized.

The utility model discloses a rare earth recovery device for a rare earth wastewater solution, and belongs to the technical field of rare earth production. Comprising a cooling box, a precipitation barrel is arranged in an inner cavity of the cooling box, the upper portion of the precipitation barrel and a lower inner cavity of the cooling box are sealed through a sealing plate, an opening of the precipitation barrel is communicated with an upper inner cavity of the cooling box, a feeding pipe and a discharging pipe are symmetrically arranged on the upper portion of the cooling box, and the feeding pipe is communicated with the side wall of the middle of the precipitation barrel; the discharging pipes are communicated with the inner cavities of the upper portions of the cooling boxes, and the discharging pipe of any cooling box is communicated with the feeding pipe of the adjacent cooling box. The precipitation cylinder is arranged in the cooling box, so that the rare earth wastewater can be quickly cooled, the crystallization of praseodymium neodymium oxalate in the rare earth wastewater is accelerated, and the recovery of praseodymium neodymium oxalate is accelerated. In addition, the filter screen disc filters praseodymium neodymium oxalate crystals, excessive filtered praseodymium neodymium oxalate crystals are prevented from entering the next cooling box, praseodymium neodymium oxalate is recycled through the multiple cooling boxes, and waste of praseodymium neodymium oxalate is prevented.

The device comprises a device body, an inner cavity, a feeding hopper, a net plate, a pushing air cylinder, a discharging port and a liquid outlet pipe, a liquid distribution cavity is formed in the top of the inner cavity, the liquid distribution cavity and the inner cavity are separated through a partition plate, the feeding hopper is arranged on the side wall of the upper end of the inner cavity, and the net plate is arranged on the side wall of the lower end of the inner cavity. One side of the supporting block is hinged to the net plate through a hinge, the other side of the supporting block is connected with the bottom of the net plate through a tension spring, the discharging port is formed in the side wall of the inner cavity and the same side of the hinge, a side installation frame is arranged on the outer side of the discharging port, and a material blocking air cylinder is installed outside the side installation frame; by arranging the screen plate and the material pushing air cylinder structure, neodymium iron boron waste materials on the screen plate can be pushed up and down, the waste materials collide with the protruding blocks on the lower side of the partition plate, the material dispersing effect is achieved, coatings on the outer surfaces of the waste materials fully react with soaking liquid, the coatings are cleaned, the cleaned raw materials are conveyed to the next station from the discharging port, and praseodymium neodymium oxide is recycled; and the soaking liquid is discharged from the liquid outlet pipe.

The invention relates to the technical field of tungsten alloy materials, in particular to a tungsten alloy wire, a preparation method thereof and application of the tungsten alloy wire in semiconductor material cutting, and tungsten alloy is composed of the following elements of, by mass, 0.4-1.1 wt% of L, 0.001-0.25 wt% of Z and the balance tungsten and inevitable impurities. Wherein L is one or more than two of lanthanum, cerium, praseodymium, neodymium, gadolinium and erbium; z comprises oxygen and carbon; the wire rod has a wire diameter of 20-60 [mu] m, the wire rod contains a linear L or L compound in the axial direction, and the average radial width D of the L or L compound is less than or equal to 5 nm. The linear element L is doped between the tungsten matrixes, and the radial average width of the element L is controlled to be smaller than or equal to 5 nm, so that the wire has the tensile strength of 5000 MPa or above under the wire diameter of 20-60 microns, and the machining performance of the tungsten alloy wire is enhanced.

The invention relates to the technical field of fluorescence sensing, in particular to a praseodymium (III) metal organic framework crystalline material and a preparation method and application thereof. According to the praseodymium (III) metal organic framework crystalline state material, Pr (III) is used as a central metal ion and forms eight coordination with eight oxygen atoms of six (4-CPCA) 2-ligands. And adjacent Pr (III) are connected through 4-CPCA < 2-> bridging to form a one-dimensional annular chain. And the one-dimensional chains are further bridged and topologically connected through a (4-CPCA) 2-ligand to form a three-dimensional structure. The praseodymium (III) metal organic framework crystalline material has good fluorescent property and stability, and can be applied to the field of fluorescence sensing.

The present invention relates to the technical field of tungsten alloy materials, and particularly relates to a tungsten alloy wire and a preparation method and application thereof. In terms of mass fraction, the components of the tungsten alloy include: 0.3-0.75 wt% of element L, 0.001-0.18% of oxygen element, and the balance is tungsten element and inevitable impurities; wherein, L is one or more of lanthanum, cerium, praseodymium, neodymium, gadolinium, and erbium; the wire diameter of the wire is 0.3-0.6 mm; and in the wire, the average radial width of the tungsten fibers is ≤0.4 μm; the number of cracks per 100 meters of flaw detection on the surface of the wire is ≤5. The tungsten alloy wire provided by the present invention has finer internal tungsten fibers, the tungsten fibers are effectively strengthened and the density is improved, and the flaw detection number on the surface of the tungsten alloy wire is small; the effective strengthening of the internal tungsten fibers and the improvement of the density enable the medium-temperature breaking force, medium-temperature creep resistance and winding performance of the wire to be improved; therefore, when it is used as a tungsten wire rope for pulling single crystal silicon, both the reliability and the service life are improved.

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.

The invention discloses a purity detection method and device for praseodymium neodymium fluoride, and relates to the technical field of physical and chemical analysis, and the method comprises the following steps: carrying out industrial traceability on a praseodymium neodymium fluoride sample to obtain sample characteristic information; k impurity detection technologies are matched according to the information, the detection process is optimized, and M detection task sequences and sample distribution requirements are generated. And detecting the sample according to the distribution requirement to obtain K original detection results. Then, impurity component analysis is carried out on the result, and through cross validation, the purity detection result of the sample is finally obtained in a reverse mode. The technical problems that in an existing praseodymium neodymium fluoride purity detection method, the sample consumption is large, and the credibility of the detection result is low are solved, and the technical effects that the sample consumption needed by praseodymium neodymium fluoride purity detection is reduced, and the credibility of the detection result is improved are achieved.

The invention discloses a cerium-zirconium-based high-entropy oxide as well as a preparation method and application thereof. According to the cerium-zirconium-based high-entropy oxide, cerium and zirconium serve as main bodies, and meanwhile rare earth elements (lanthanum, praseodymium, neodymium and samarium) and transition metal elements (manganese, iron, cobalt, nickel, copper and zinc) are introduced to form a high-entropy solid solution with the equal molar ratio and containing 3-8 kinds of metal. In the cerium-zirconium-based high-entropy oxide, the cerium element and the zirconium element respectively account for 20%-40% of the total amount, and the other elements are respectively 10%-30% in an equimolar ratio. The cerium-zirconium-based high-entropy oxide catalyst prepared by the invention has excellent oxygen storage and release capacity and CO oxidation capacity, and the CO complete conversion temperature is 181 DEG C. The method adopts a simple coprecipitation process, is mild in condition and low in cost, and is suitable for large-scale application in the field of tail gas purification.

The invention discloses a high-cerium neodymium-iron-boron magnet and a preparation method thereof, and relates to the field of rare earth permanent magnet materials. The high-cerium neodymium-iron-boron magnet is prepared through a double-main-phase method, in the preparation process, the surface of cerium main-phase magnetic powder is sequentially coated with a praseodymium diffusion layer and a heavy rare earth-oxide barrier layer through a magnetron sputtering method, the diffusion direction of praseodymium and heavy rare earth elements is limited, and excessive mutual diffusion of neodymium and cerium is restrained; in addition, grain boundary diffusion heavy rare earth elements are guided to penetrate into the magnet, a good modification effect is achieved with a small amount of added elements, and the magnetic performance of the high-cerium neodymium-iron-boron magnet is greatly improved.

The invention relates to the technical field of CH4-CO2 reforming catalysts, in particular to a Ni-based CH4-CO2 reforming catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: adding absolute ethyl alcohol into a polyvinylpyrrolidone solution to obtain a dispersion liquid; adding a nickel salt, a lanthanum salt and a praseodymium salt into the dispersion liquid for dissolving to obtain an electrostatic spinning solution; performing electrostatic spinning on the electrostatic spinning solution to obtain a fiber film; roasting the fiber film to obtain a catalyst precursor; and calcining the catalyst precursor to obtain the Ni-based CH4-CO2 reforming catalyst. The Ni-based CH4-CO2 reforming catalyst prepared by the preparation method disclosed by the invention has relatively good catalytic activity and stability; the alloy formed by the La-Pr bimetal greatly improves electron transfer in the reforming reaction process, so that the catalytic activity and catalytic stability of the CH4-CO2 reforming catalyst are effectively 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.