421 results about "Samarium" patented technology

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 provides a samarium / europium / gadolinium-containing zirconium hydride block as well as a preparation method and application thereof, and relates to the technical field of radiation shielding materials. The zirconium hydride block containing samarium / europium / gadolinium comprises the following elements in percentage by mass: 95% < = Zr < = 99.5%, 0% < = Gd < = 5%, 0% < = Sm < = 5%, 0% < = Eu < = 5% and 0% lt. Gd + Sm + Eu < = 5%. The preparation method comprises the following steps: respectively hydrogenating sponge zirconium, metal gadolinium, metal europium and metal samarium to respectively obtain corresponding hydride powder; weighing zirconium hydride powder, gadolinium hydride powder, europium hydride powder and samarium hydride powder according to a required proportion, and uniformly mixing under a protective atmosphere; and carrying out pressure sintering on the mixed powder, and carrying out secondary hydrogenation to obtain the zirconium hydride block containing samarium / europium / gadolinium. According to the invention, the absorption of the material to low-energy-segment neutrons can be obviously improved; and the preparation of the zirconium hydride block containing samarium / europium / gadolinium and the accurate regulation and control of doped elements are realized.

The invention discloses a samarium cobalt permanent magnet and a preparation method and application thereof. The preparation method comprises the following steps: (1) carrying out crushing and jet milling on an alloy ingot formed by raw materials required by the samarium-cobalt permanent magnet to obtain first alloy fine powder with D50 of 4-6 microns; (2) 15-30 wt% of the first alloy fine powder is taken out, then the taken-out first alloy fine powder is subjected to ball milling, and second alloy fine powder with D50 being 0.5-1.2 microns is obtained; (3) the remaining first alloy fine powder and the second alloy fine powder obtained in the step (2) are mixed, and mixed powder is obtained; 4) carrying out orientation molding and isostatic pressing on the mixed powder to obtain a green body; and the green body is subjected to sintering, solid solution and aging treatment, and the samarium-cobalt permanent magnet is obtained. By adopting the preparation method disclosed by the invention, the bending strength of the samarium-cobalt permanent magnet can be obviously improved on the basis that the magnetic performance of the samarium-cobalt permanent magnet is not reduced basically.

The invention belongs to the technical field of chemical engineering, and particularly relates to a catalyst for sulfuric acid production. The samarium element is doped in the vanadium catalyst, so that the oxygen adsorption capacity of the vanadium catalyst is effectively improved, and the catalytic activity and low-temperature activity of the vanadium catalyst are improved; the modified diatomite and the mesoporous material are selected to jointly form the carrier, so that the dispersity of the active component on the catalyst can be improved, and the catalytic activity of the catalyst can be improved; diatomite is modified by adopting a dilute sulfuric acid solution under an ultrasonic condition, so that the specific surface area of the diatomite is increased, and the catalytic activity of the vanadium catalyst is improved; the vanadium catalyst is prepared by adopting an impregnation method, so that the problem of non-uniform dispersion of active components caused by a mixing and grinding method is effectively avoided, and the catalytic activity of the catalyst is further improved.

The invention relates to the technical field of magnetic materials, in particular to high-performance samarium-iron-nitrogen powder and a preparation method and application thereof. The invention provides a preparation method of samarium-iron-nitrogen powder, which comprises the following steps: (1) mixing Sm2O3 powder, Fe powder and a Ca reducing agent, and carrying out reduction reaction to obtain samarium-iron alloy; (2) mixing and crushing the samarium-iron alloy, mixing the crushed samarium-iron alloy with a dispersant and a passivation solution, carrying out ball milling, separating, and drying to obtain samarium-iron alloy powder; (3) nitriding the samarium-iron alloy powder to obtain samarium-iron-nitrogen powder; wherein the dispersing agent is selected from at least one of alkali metal phosphates; the passivation solution comprises chromium chloride, nitric acid, sulfuric acid and colloidal silicon dioxide. The samarium-iron-nitrogen powder prepared through the method has good magnetic performance.

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 method comprises the following steps: weighing an oxide precursor of metal indium, an oxide precursor of metal M, an ammonium salt and a lithium salt according to a chemical formula of indium-based halide, fully mixing, and calcining in an inert atmosphere to obtain the indium-based halide solid electrolyte. Forming an indium-based halide solid electrolyte through a solid-phase reaction; wherein M is selected from at least one of magnesium, calcium, strontium, barium, aluminum, gallium, indium, bismuth, scandium, yttrium, zinc, germanium, tin, lanthanum, cerium, samarium, gadolinium, holmium, erbium and ytterbium. The method can greatly simplify the synthesis process, reduce the raw material cost and realize industrial batch preparation.

The invention discloses a ruthenium and samarium double monatomic doped three-dimensional titanium-based tin antimony nickel electrode and a preparation method and application thereof. The preparation method of the electrode comprises the following steps: (1) pretreating the titanium felt; (2) preparing a sol impregnation liquid; (3) sol coating and drying: dipping the pretreated titanium felt in the prepared sol dipping liquid, fully adsorbing and then drying to form a uniform precursor layer; and (4) roasting treatment is conducted, specifically, the dried titanium felt is placed in a muffle furnace to be roasted, and then the steps of dipping, drying and roasting are repeated till the final ruthenium and samarium double monatomic doped three-dimensional titanium-based tin-antimony-nickel electrode is obtained. In the prepared electrocatalyst, ruthenium and samarium are doped into a tin-antimony-nickel electrode in a monatomic form, the utilization efficiency of ruthenium and samarium atoms is improved, and the electrode is endowed with excellent electrocatalytic activity. The unique three-dimensional structure and double-monatomic doping significantly enhance the electron transfer rate and the reaction kinetic characteristics, so that the electrode shows excellent stability and efficient hypochlorous acid generation ability.

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 modified samarium-iron-nitrogen powder and a preparation method and application thereof, and belongs to the technical field of magnetic material preparation, the preparation method comprises the following steps: 1, mixing soluble samarium salt, iron oxide and ammonia water, and reacting to obtain a mixed solution; 2, mixing the mixed solution with an alkali metal hydroxide solution, and reacting to obtain a precursor; 3, the precursor reacts in the ammonia atmosphere, and samarium-iron-nitrogen powder is obtained; 4, a coating layer is arranged on the surface of the samarium-iron-nitrogen powder, and the modified samarium-iron-nitrogen powder is obtained. The preparation method is simple and convenient, and the prepared modified samarium-iron-nitrogen powder is high in purity, moderate in alpha-Fe content and excellent in intrinsic coercive force and can be used for manufacturing high-performance samarium-iron-nitrogen magnetic powder.

The invention discloses a Zn-coated samarium-iron-nitrogen magnetic sheet and a preparation method thereof, and belongs to the technical field of magnetic materials. A Zn-coated samarium-iron-nitrogen magnetic sheet comprises a Zn-coated samarium-iron-nitrogen magnet base body and a rubber layer and has double-layer coating, the inner coating layer is Zn, and the outer coating layer is the rubber layer; the preparation method comprises the following steps: (1) preparing Zn-coated samarium-iron-nitrogen magnetic powder; (2) preparing a Zn-coated samarium-iron-nitrogen magnet matrix; (3) preparing a rubber layer; and (4) preparing the Zn-coated samarium-iron-nitrogen magnetic sheet. According to the method, the low-melting-point Zn element is used for carrying out coating treatment on the samarium-iron-nitrogen powder under the action of the protective gas, meanwhile, the Zn-coated samarium-iron-nitrogen magnet matrix is subjected to anti-oxidation treatment again through the rubber layer, a new samarium-iron-nitrogen powder coating technology is developed, and the Zn-coated samarium-iron-nitrogen magnetic sheet with high magnetic performance is prepared.

The invention provides a high-density mould pressing bonding samarium-iron-nitrogen magnet with an extremely low cavity volume ratio and a preparation method of the high-density mould pressing bonding samarium-iron-nitrogen magnet, and belongs to the technical field of magnets, and the high-density mould pressing bonding samarium-iron-nitrogen magnet is prepared from a binder, a lubricant and the balance of samarium-iron-nitrogen magnetic powder. The preparation method comprises the following steps: performing surface treatment on the samarium-iron-nitrogen magnetic powder; dissolving a binder with an organic solvent, and adding the treated magnetic powder and a lubricant to obtain clinker; preheating a pressing mold, and preheating the clinker to 20-120 DEG C; the pressing force ranges from 6 T / cm < 2 > to 50 T / cm < 2 >, the pressing and pressure maintaining time ranges from 0.3 second to 150 seconds, meanwhile, a mold cavity of the mold is vacuumized, air among powder particles is exhausted, and finish machining is carried out after a compact structural body is formed. Through vacuum grease overflow compression molding, effective filling of cavities in the magnet is achieved, redundant resin overflows out of contact points among magnetic powder particles, the cavity rate of the magnet is remarkably reduced, the density of the samarium-iron-nitrogen magnet under the same pressure condition is remarkably improved, the crushing degree of the magnetic powder particles is reduced, and finally the magnetic performance of the magnet is remarkably improved.

The invention discloses a method for simultaneously optimizing the squareness and the remanence temperature coefficient of a 2: 17 type samarium-cobalt sintered magnet, and belongs to the technical field of rare earth permanent magnet material preparation. A component Sm < 1-x > RE < x > (CobalFeaCubZrc) z is designed, RE is one or more of Dy, Er, Gd, Tm and other heavy rare earth elements, and a, b, c and x meet the following relations: 0 < = x < = 0.6, 0.1 < = a < = 0.2, 0.06 < = b < = 0.12, 0.02 < = c < = 0.03, and 6.9 < = z < = 7.9. On the basis of a conventional smelting and ingot casting-isothermal annealing-powder preparation-oriented profiling-sintering-solid solution-aging process, an isothermal annealing process is added after smelting and ingot casting: the temperature is raised to 1190-1210 DEG C in a tubular furnace, isothermal annealing is performed for 5-20 hours, heavy rare earth elements are eliminated, and the influence of the stability of a 2: 17H phase on the component uniformity and magnetic performance of a magnet is improved; and substitution sites of heavy rare earth can be increased, and the residual magnetism temperature coefficient is optimized.

The invention relates to an MIM injection-molded samarium-iron-nitrogen magnet and a preparation process thereof.The preparation process comprises the steps that Nb is added into Sm2Fe17, a Nb nano-modified layer is formed through high-energy ball milling and heat treatment, then a degreased blank is obtained through a paraffin-polylactic acid-stearic acid ternary binder system with the mass ratio being 60: 30: 10 and gradient degreasing, and after the degreased blank is sintered, the MIM injection-molded samarium-iron-nitrogen magnet is obtained; nitriding treatment is carried out by adopting a three-stage process, and then the samarium-iron-nitrogen magnet with high magnetism is obtained after ultrasonic cleaning and other treatment.

The invention provides a carbonyl sulfide hydrolysis catalyst and a preparation method thereof. The preparation method comprises the following steps: respectively preparing a K-containing alkaline solution and a samarium salt aqueous solution for later use; dipping the catalyst carrier in a K-containing alkaline solution, and then carrying out a first reaction under a certain condition to obtain a K-loaded catalyst precursor; immersing the catalyst precursor in a samarium salt aqueous solution for a second reaction, and further loading samarium; the carbonyl sulfide hydrolysis catalyst is prepared by the preparation method, and in the carbonyl sulfide hydrolysis catalyst, the mass fraction ratio of K to samarium is (8: 1)-(12: 1). The preparation method provided by the invention has the advantages that the raw materials are cheap and easy to obtain, the method is simple and easy to popularize, a large amount of organic solvents are prevented from being used in the preparation process, the method is more environment-friendly, and the prepared catalyst has the characteristics of higher activity, stronger stability and difficulty in poisoning when being used for catalytic hydrolysis of COS.

The invention discloses a high-performance ultrathin rare earth permanent magnet sheet 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: melting an iron raw material and a part of a samarium raw material under a vacuum condition, then adding the balance of samarium, continuously melting, and pouring the obtained molten alloy onto a cooling roller to obtain a samarium-iron alloy sheet; the samarium-iron alloy sheet is sequentially subjected to homogenization treatment, hydrotreating and nitriding treatment, and nitrided magnetic powder is obtained; adding phosphoric acid and a corrosion inhibitor into the magnetic powder, carrying out wet ball milling, and drying to obtain surface-treated magnetic powder; adding a binder into the surface-treated magnetic powder, and banburying to obtain magnetic particles; the magnetic particles are pressed by a press vulcanizer, the thickness of the prepared rare earth permanent magnetic sheet is only 0.2 mm-0. 4mm, and the magnetic sheet is high in corrosion resistance, sufficient in surface magnetism, high in magnetic performance, low in preparation cost and capable of meeting application requirements of specific scenes.

The invention discloses a samarium manganese mullite catalyst rich in Sm vacancy and a preparation method and application thereof, and belongs to the technical field of VOCs waste gas catalytic oxidation. According to the invention, samarium nitrate and manganous nitrate are used as precursors, citric acid monohydrate is used as a chelating agent, urea is used as an additive, and the samarium manganese mullite catalyst rich in Sm vacancies is synthesized through a sol-gel method. The Sm vacancy samarium manganese mullite catalyst prepared by the invention shows excellent toluene catalytic oxidation low-temperature activity due to selective removal of inert Sm atoms on the surface of samarium manganese mullite, more active Mn atoms are exposed, and the surface lattice oxygen migration performance is enhanced. The catalyst has excellent performance in a stability test and a water vapor resistance test, and has a wide industrial application prospect.

The invention relates to a samarium molybdate / reduced graphene oxide electro-catalytic material, a preparation method and application thereof and an electrochemical sensor, and relates to the technical field of electro-catalytic materials and electrochemical sensors, the preparation method comprises the following steps: dispersing GO in water, and stirring to obtain a GO suspension; the preparation method comprises the following steps: separately adding Sm (NO3) 3.6 H2O and Na2MoO4. 2H2O into water for ultrasonic dissolution, and mixing to obtain a first mixture; stirring and mixing the GO suspension and the first mixture to obtain a second mixture, and the like. The samarium molybdate / reduced graphene oxide electro-catalytic material is synthesized by a hydrothermal synthesis method and is used for modifying a glassy carbon electrode so as to be applied to electrochemical detection of FZD for the first time. Compared with a traditional detection method, the detection method has the advantages of being simple, efficient, green, environmentally friendly, sensitive in response and portable, and a new way is provided for detection of carcinogenic residues.

A magnetic elastomer and a method of preparing the same are provided. The magnetic elastomer includes the following components based on the total weight of the magnetic elastomer, 50 wt %-85 wt % of a magnet powder, 5 wt %-30 wt % of a binder, and 1 wt %-30 wt % of a processing aid. The magnet powder includes samarium iron nitrogen magnet powder and / or neodymium iron nitrogen magnet powder. When present, the samarium iron nitrogen magnet powder has an x50 particle size of less than or equal to 2.4 μm; when present, the neodymium iron nitrogen magnet powder has an x50 particle size of less than or equal to 2.0 μm.

The invention discloses a preparation method and application of samarium-doped lanthanum ferrite nanofibers, and the preparation method is a design thought based on synergistic interaction of'defect engineering 'and'morphology control': samarium (Sm) ions with a specific proportion are creatively introduced to the A site of LaFeO3, and lattice distortion is induced by utilizing radius mismatch between the samarium (Sm) ions and lanthanum (La) ions; therefore, high-concentration gas-sensitive active sites (oxygen vacancies) are generated in the intrinsic structure of the material; and the material is constructed into a one-dimensional nanofiber network with a high specific surface area through an electrostatic spinning technology, so that the exposure efficiency of active sites is maximized.

The invention discloses a magnetic rubber composition, a preparation method thereof and a sealing strip, and belongs to the field of rubber materials. The composition takes ethylene propylene diene monomer as a matrix, and comprises 100-600 parts of modified samarium iron nitrogen, 15 parts of a silane coupling agent Si69, 0.7-1 part of a vulcanizing agent and 5-15 parts of a foaming agent, and 1-10 parts of epoxy grafted modified beta-CD can also be added. The modified samarium-iron-nitrogen is loaded and grafted, and then the sealing strip is prepared through the working procedures of mixing, vulcanizing, magnetizing and the like. According to the sealing strip, carbon black is replaced with the magnetic powder, the VOC release amount and the odor level are reduced, the mechanical property is improved, magnetic attraction force is given, and the problem of rebound deterioration of a traditional sealing strip is solved through surface modification of the magnetic powder.

The invention provides a preparation method of high-performance rapid-quenching samarium-iron-nitrogen magnetic powder, and belongs to the technical field of magnetic materials, and the preparation method comprises the following steps: A1, weighing according to 2-3% excess Sm, and smelting and rapidly hardening samarium powder and iron powder in a small smelting and rapid-quenching device to obtain primary alloy powder; a2, cooling the primary alloy powder, uniformly mixing the cooled primary alloy powder with metal samarium powder, and carrying out smelting and rapid hardening again to obtain secondary alloy magnetic powder; a3, the secondary alloy powder is subjected to HDDR treatment, and modified alloy powder is obtained; and A4, the modified alloy powder is subjected to nitriding treatment, and the high-performance rapid-quenching samarium-iron-nitrogen magnetic powder uniform in structure is obtained. According to the invention, through loss of metal samarium in a primary alloy powder stage and alloy component segregation caused by density difference of a molten pool in smelting, metal samarium complementation in secondary smelting is increased, and the phenomenon of nonuniform magnetic performance of magnetic powder particles caused by alloy component segregation is effectively restrained; and the prepared magnetic material has relatively high coercive force, magnetic performance and uniformity.

The invention relates to a Ti element doped high-performance high-temperature samarium cobalt permanent magnet material and a preparation method thereof, and belongs to the field of rare earth permanent magnet materials. Elements of Sm, Co, Fe, Cu, Zr and Ti with the purity higher than 99.9% are uniformly mixed and smelted into an original cast ingot, a powder metallurgy preparation technology is adopted, the cast ingot is ground into alloy powder, and the samarium-cobalt permanent magnet material is prepared through orientation compression, isostatic pressing, high-temperature sintering, solid solution and isothermal aging heat treatment processes. According to the invention, by doping the Ti element, the grain size is increased, the grain boundary impurity phase precipitation is inhibited, and the thickness and the content of the flaky phase are properly reduced, so that the number of reverse magnetization nucleation sites is reduced, and the magnetic properties such as the coercive force and the maximum magnetic energy product of the magnet are effectively improved.

The invention provides a doped yttrium hydride neutron moderation material and a preparation method and application thereof, and belongs to the technical field of radiation shielding materials. At least one of samarium, europium and gadolinium is doped in yttrium hydride in the form of hydride, and the mass ratio of metal yttrium to metal gadolinium to metal europium to metal samarium is controlled, so that the neutron moderation effect of the neutron moderation material can be improved. According to the invention, at least one of gadolinium hydride, europium hydride and samarium hydride is mixed with yttrium hydride under the protective atmosphere, so that the mass content of each element in the doped yttrium hydride neutron moderation material can be accurately controlled. According to the invention, the mixture is sintered and molded, and the sintering parameters of sintering and molding are controlled, so that the components of the mixture are sintered in a compact state, cracks generated by thermal expansion and cold contraction can be reduced, and the doped yttrium hydride keeps high density and has fewer cracks and defects.

The invention provides a lithium-rich manganese-based composite lithium battery positive electrode material and a preparation method thereof. The materials include the following components: 5-100 parts of a lithium-rich manganese-based positive electrode substrate with a molecular formula of xLi2MnO3·(1-x)LiMO2, 1-10 parts of nanodiamondene, 1-15 parts of silicon dioxide, 2-5 parts of iron oxide, 1-50 parts of ethylene glycol, 1-2 parts of solid paraffin, and 0.5-2 parts of a rare earth samarium compound. The lithium-rich manganese-based composite lithium battery positive electrode material provided by the invention has the advantages of high specific capacity, a first cycle voltage of up to about 4.7V, stable high-temperature cycle performance, and the like. The invention has a simple process, low equipment strength requirements, a short production cycle, is suitable for industrial production requirements, and has great economic value and practical value.

According to the preparation method of the free-cutting lead brass alloy, trace elements such as tellurium, cobalt, samarium and selenium are added into lead brass, the tellurium, the selenium and the like can easily form low-melting-point compounds with other elements, grain growth can be inhibited, dispersed distribution of fine lead particles is promoted, stress concentration is reduced, and the cutting performance is improved; by adding cobalt, samarium and the like, grain refinement is facilitated, distribution and forms of selenium, tellurium and other elements are changed, alloy fluidity is promoted, dispersed distribution of lead and the like is promoted to be more uniform, the cutting performance is further improved, in addition, dissolution of lead can be inhibited through the passive film layer, the environment-friendly performance is improved, and harm caused by dissolution of lead is reduced.

Described herein is a chalcogen-halide solid electrolyte material represented by the following chemical formula: LiAxEyGz, or NaAxEyGz. In embodiments, A denotes one or more elements selected from the group consisting of magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), Lanthanum (La), cerium (Ce), samarium (Sm), and boron (B). In embodiments, E denotes one or more chalcogen elements. In embodiments, G denotes one or more halide elements. In embodiments, the following mathematical formula is satisfied: 0<x<10, 0<y<10, z=nx−2y+1, wherein n=3 when A denotes at least one element selected from the group consisting of La, Ce, Sm, and B, and n=2 when A denotes at least one element selected from the group consisting of Mg, Ca, Sr, and Ba. In embodiments, A is a single element selected from the group consisting of Mg, Ca, Sr, Ba, La, Ce, Sm, or B.

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 belongs to the technical field of magnetic materials, and particularly relates to a preparation method of anisotropic samarium-iron-nitrogen permanent magnet powder. The preparation method of the anisotropic samarium-iron-nitrogen permanent magnet powder comprises the following steps that (1) a single-phase Sm2Fe17 alloy cast ingot is sequentially subjected to coarse crushing and jet mill smashing, and samarium-iron alloy powder is obtained; (2) nitriding the samarium-iron alloy powder in a plurality of temperature sections; (3) grinding the samarium-iron alloy powder subjected to nitriding treatment by using a sand mill; the temperature of the nitriding treatment is 350-520 DEG C, the nitriding treatment is divided into 2-5 temperature sections, and the temperature is increased in sequence. By regulating and controlling the oxygen content, the particle size and nitriding treatment process parameters of the samarium-iron alloy powder before nitriding treatment, full nitriding of the samarium-iron alloy powder is achieved, and the samarium-iron-nitrogen permanent magnet powder with good magnetic performance is obtained.

The invention provides an MIM injection molding process of a samarium-cobalt permanent magnet, which comprises the following steps: preparing low-coercivity MIM samarium-cobalt magnetic powder, performing high-vacuum banburying and granulation, controlling the injection molding process and external magnetic field intensity, and finally performing optimized degreasing, sintering and aging processes to prepare the MIM samarium-cobalt permanent magnet. According to the method, the input amount of Sm in the raw materials is reduced and the cost is saved by regulating and controlling the positions of all groups of raw material powder during smelting, and meanwhile, the ordering of magnetocrystalline units during magnetizing after the low-coercivity MIM powder is formed is improved through multi-stage and multi-section sintering and multi-stage and multi-section aging, so that it is guaranteed that the MIM samarium-cobalt magnet obtains high magnetic performance.