321 results about "Dysprosium" patented technology

The invention provides a method for preparing a high-coercivity sintered neodymium-iron-boron magnet, and belongs to the technical field of rare earth permanent magnet material preparation, and the method comprises the following steps: 1, taking the sintered neodymium-iron-boron magnet as a base material, and removing an oxide layer through alkali washing deoiling, ultrasonic water washing and acid pickling cleaning; 2, taking the Pr-Dy-Cu-Ga quaternary alloy as a diffusion source, and cutting the Pr-Dy-Cu-Ga quaternary alloy into slices; 3, attaching the thin sheet to the surface of a base material for diffusion heat treatment; fourthly, low-temperature tempering is conducted; 5, testing a room temperature demagnetization curve of the sample; light rare earth Pr replaces a part of heavy rare earth Dy and is matched with Cu and Ga elements in a certain proportion to be smelted to obtain quaternary alloy, the quaternary alloy with low heavy rare earth serves as a diffusion source, the microscopic characteristics of the magnet are improved, grain boundary phase distribution is optimized, and under the condition that residual magnetism and the maximum magnetic energy product are slightly reduced, the coercive force of the sintered neodymium-iron-boron magnet is improved; and terbium and dysprosium are not used, so that the use amount of heavy rare earth elements and the production cost are reduced.

The invention relates to the technical field of zinc alloy materials, in particular to a corrosion-resistant zinc alloy material and a preparation method thereof. The invention relates to a corrosion-resistant zinc alloy material which comprises the following components in percentage by mass: 8%-11% of aluminum, 0.25%-0.45% of copper, 0.1%-0.3% of nickel, 0.01%-0.02% of titanium, 0.01%-0.03% of cobalt, 0.01%-0.03% of lanthanum, 0.001%-0.002% of dysprosium, 0.003%-0.005% of manganese silicide and the balance of zinc. Through alloy components in a specific ratio and a fine preparation process, not only are original good casting performance and mechanical strength of the zinc alloy maintained, but also the corrosion resistance of the zinc alloy material is remarkably improved, the service life is prolonged, and the application range of the zinc alloy material is widened.

A dielectric ceramic composition includes a first crystal grain that has a perovskite structure expressed by a general formula of BaTiO3, and has a core portion and a shell portion surrounding the core portion and including dysprosium, and a second crystal grain in which an elemental ratio of barium to titanium is 0.70 or less and a main component is barium titanate composite oxide. An elemental ratio of barium to titanium of the dielectric ceramic composition is 0.90 or more and 0.98 or less.

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 provides a method for manufacturing a terbium-dysprosium-iron giant magnetostrictive alloy based on three-dimensional photocuring molding, which comprises the following steps of: firstly, preparing three-dimensional photocuring molding slurry, adopting photosensitive resin as a matrix, and matching with a metal organic chelating agent containing terbium-dysprosium-iron giant magnetostrictive alloy component to enhance the uniform distribution of metal powder so as to ensure the printing precision and the material stability; secondly, the resin and the chelating agent are removed through heat treatment degreasing, the degreasing process is controlled by controlling the heating rate, and structural collapse is avoided; decarburization is carried out in a low-oxygen atmosphere, so that the purity of the alloy is improved, and the structural integrity before sintering is ensured; then reduction treatment is performed to improve the structural stability and purity; and finally, high-temperature sintering is carried out under the assistance of a magnetic field, grain orientation and magnetic domain arrangement are optimized, and the magnetostrictive effect and the force-magnetic energy conversion efficiency are improved. According to the method, three-dimensional light curing forming and magnetic field auxiliary heat treatment are combined, and the risk of structural damage in the printing process of the terbium dysprosium iron giant magnetostrictive alloy is practically and effectively avoided.

The invention discloses a dielectric ceramic material and a preparation method thereof, and relates to the technical field of dielectric ceramic materials, and the technical key points are as follows: the dielectric ceramic material comprises barium titanate (BaTiO3) which accounts for 80-99 wt% of the weight of the finished dielectric ceramic material; the dielectric ceramic material also comprises a dopant, and the dopant accounts for 1-20wt% of the weight of the dielectric ceramic material finished product. The doping agent comprises silicon dioxide (SiO2), magnesium carbonate (MgCO3), manganous-manganic oxide (Mn3O4), barium titanate (BaCO3) and rare earth oxide D2O3; wherein D represents any one or more of yttrium (Y), holmium (Ho), ytterbium (Yb), gadolinium (Gd) and dysprosium (Dy); the invention provides a dielectric ceramic material which meets the EIAX7R standard and still has a high IR characteristic and a low dielectric loss factor (tan delta) in a high-temperature environment and a preparation method of the dielectric ceramic material.

The invention discloses a diffusion source, a preparation method of the diffusion source and a processing method of a neodymium-iron-boron magnet. The diffusion source comprises aluminum or aluminum alloy foil, wherein rare earth element-containing particles, non-rare earth metal oxide and non-rare earth metal are attached to the upper surface and the lower surface of the aluminum or aluminum alloy foil respectively; the rare earth elements in the rare earth element-containing particles are selected from one or more of terbium, dysprosium, praseodymium and neodymium; the rare earth element-containing particles are selected from one or more of rare earth hydride particles, rare earth fluoride particles and rare earth metal particles; the non-rare earth metal oxide is selected from one or more of aluminum oxide and magnesium oxide; the non-rare earth elements in the non-rare earth metals are selected from one or more of copper, aluminum, magnesium, iron, zirconium, niobium and gallium. The diffusion source can reduce the use amount of rare earth elements and effectively improve the coercive force of the neodymium-iron-boron magnet.

The invention relates to the technical field of CO oxidation, in particular to a CO oxidation catalyst, a preparation method of the CO oxidation catalyst and a CO oxidation method. The carrier is selected from one or more of dysprosium oxide, yttrium oxide and holmium oxide, the particle size of the carrier is 20-100 nm, and the average particle size is 25-76 nm; the noble metal is selected from one or more of platinum, ruthenium and palladium, and the content of the noble metal element is 0.1 wt%-2wt% of the carrier. One or more of dysprosium oxide, yttrium oxide and holmium oxide with the particle size of 20-100 nm and the average particle size of 25-76 nm are adopted as the carrier to prepare the CO oxidation catalyst, and the CO oxidation catalyst is used for CO catalytic oxidation, has the advantage of lower carbon monoxide ignition temperature and is long in service life.

The invention provides a sintered neodymium-iron-boron magnet and a preparation method thereof. The sintered neodymium-iron-boron magnet comprises a neodymium-iron-boron sintered body and a heavy rare earth layer, wherein the heavy rare earth layer comprises heavy rare earth and an oxide; part or all of the surface of the neodymium-iron-boron sintered body is covered by the heavy rare earth layer, and heavy rare earth is distributed in an area, at least 3.5 mm deep from the surface, of the neodymium-iron-boron sintered body covered by the heavy rare earth layer; the oxide is one or more of aluminum oxide, silicon oxide, calcium oxide, magnesium oxide, zirconium oxide, copper oxide and zinc oxide, and the heavy rare earth is one or more of dysprosium, terbium, holmium and gadolinium. At least one part of the surface of the neodymium-iron-boron sintered body is covered with the heavy rare earth layer containing the oxide, when the heavy rare earth is diffused at a high temperature, the heavy rare earth enters the neodymium-iron-boron sintered body, the oxide is high in melting point, relatively thick and left on the surface of the neodymium-iron-boron sintered body, the effect of a spacer is achieved, magnet adhesion can be effectively prevented when the heavy rare earth is diffused, and the service life of the magnet is prolonged. And the preparation of the magnet is more convenient, and industrial application is realized.

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 provides a medical biological rare earth magnesium alloy material. The medical biological rare earth magnesium alloy material comprises magnesium, gadolinium, zinc, zirconium, dysprosium and scandium. According to the rare earth magnesium alloy material provided by the invention, different contents of rare earth gadolinium, dysprosium, scandium, zinc and zirconium are added to improve the casting performance and the processing performance of a melt, and the alloy structure is improved through solid solution strengthening, dispersion strengthening and grain refinement effects, so that the strength and the ductility are improved; meanwhile, the selection design of the alloy elements strictly conforms to the limitation of biotoxicity, and the biological activity of the alloy elements can not be influenced, so that excellent mechanical properties and processability are obtained while good biocompatibility is kept, and the alloy elements play roles in accelerating osteogenesis and promoting bone tissue growth while playing a fixing role; the non-toxicity, the degradability and the high therapeutic property are really realized.

The invention relates to the technical field of radiation rings, and discloses a compression molding process of a high-performance sintered NdFeB radiation ring, which comprises the following steps: S1, preparing a NdFeB radiation ring biscuit: S11, preparing powder; s12, the neodymium iron boron radiation ring is formed, and a neodymium iron boron radiation ring biscuit formed by combining the radiation ring inner layer and the radiation ring outer layer is formed; and S2, sintering: putting the biscuit into a sintering mold arranged in a furnace body, heating, and then cooling and forming. According to the compression molding process of the high-performance sintered neodymium-iron-boron radiation ring, dysprosium powder is gradually mixed on the outer layer of a neodymium-iron-boron radiation ring blank by utilizing a movable mold structure in the process of preparing the neodymium-iron-boron radiation ring blank, the dysprosium powder and the neodymium-iron-boron radiation ring blank are integrally molded and prepared, and then the high-performance neodymium-iron-boron radiation ring is obtained through sintering. The strength, the abrasion resistance and the service life of the Ru-iron-boron radiation ring are greatly improved, and the radiation ring can be provided with a top cover structure convenient to assemble through the combination of a plurality of dies.

A multilayer ceramic capacitor may include a capacitor body including a dielectric layer and an internal electrode layer, and an external electrode disposed outside the capacitor body, where the dielectric layer may include a plurality of dielectric grains and a grain boundary located between the dielectric grains adjacent to each other, where the dielectric grain may include a barium titanate-based main component including barium (Ba) and titanium (Ti), where the grain boundary includes silicon (Si), dysprosium (Dy), and terbium (Tb), and where silicon (Si), dysprosium (Dy), and terbium (Tb) are included in the grain boundary in content order of terbium (Tb)<dysprosium (Dy)<silicon (Si).

The invention relates to the technical field of spherical particle dysprosium oxide, and discloses monodisperse spherical particle dysprosium oxide with the particle size smaller than 300 nm and a preparation method of the monodisperse spherical particle dysprosium oxide. The preparation method comprises the following steps: S1, a precipitate preparation process: a, preparing a dysprosium chloride-PEG mixed solution; preparing a urea solution; b, adding the dysprosium chloride-PEG mixed solution into a urea solution to obtain a primary material A mixed solution; c, heating the primary material A mixed solution in an electric furnace, keeping the temperature constant, and adjusting the pH value to obtain a precipitate A; d, aging the precipitate, discarding mother liquor, washing, and carrying out suction filtration to obtain a precipitate B; s2, a calcining process: a, putting the precipitate into a crucible, and opening a cover; b, putting the crucible into a muffle furnace for calcining, and calcining in three stages in a stepped temperature control manner; and S3, an ultrasonic process. Realizing lt; successful research and development of 300nm submicron particle rare earth dysprosium oxide not only is a size breakthrough, but also monodispersity means that the particles are highly uniform in size, morphology and composition, and the rare earth dysprosium oxide has good application prospects in the fields of catalysis, biomedicine, magnetic materials and the like.

The invention discloses a nano rare earth composite enhanced high-performance ceramic chopper as well as a preparation method and application thereof. The ceramic chopper is prepared from the following raw materials in percentage by mass: 85 to 95 percent of aluminum oxide powder, 2 to 10 percent of zirconium oxide powder, 0.5 to 2 percent of dysprosium oxide powder, 1 to 2 percent of magnesium oxide powder and 0.5 to 1.5 percent of yttrium oxide powder. The ceramic chopper is prepared from the preparation raw materials through high-temperature sintering. The ceramic chopper has excellent wear resistance, strength, toughness and high-temperature stability, and packaging quality and production efficiency can be remarkably improved when the ceramic chopper is applied to semiconductor packaging.

The invention discloses a ruthenium-based rare earth composite catalyst and a preparation method and application thereof, the composite catalyst is formed by loading alloy particles of Ru metal and rare earth metal on carboxyl modified lignin derived mesoporous carbon, the molecular formula of the composite catalyst is RuxREy-CLC, x is equal to 0.5-1, y is equal to 0.01-0.1, and RE is any one of neodymium, cerium, lanthanum, samarium, gadolinium, erbium, dysprosium and praseodymium; the catalyst is obtained by coordinating ruthenium ions, rare earth metal ions and carboxyl modified lignin and then carbonizing. According to the ruthenium-based rare earth composite catalyst, more catalytic active sites can be provided through alloy nanoparticle ultra-fining and high dispersion, OH * strong adsorption poisoning is remarkably weakened through introduction of rare earth metal, the excellent alkaline hydrogen evolution reaction electrocatalytic activity is shown, the catalytic stability is improved, and the catalytic activity of the catalyst is improved. The comprehensive performance is obviously superior to that of similar and commercial catalysts, and the catalyst has considerable energy application potential.

The invention provides a method for promoting growth of dysprosium scandate single crystals, which comprises the following steps: preparing raw materials: uniformly mixing the raw materials, and putting into a crucible; setting growth conditions: putting the crucible filled with the raw materials into a high-temperature furnace, and setting temperature gradient, pressure and growth speed; growing by a lifting method: in the growth process, slowly lifting the seed crystal from the molten raw material at a constant speed through a lifting device, and controlling the cooling rate of the crystal to promote the growth of the single crystal; real-time weighing monitoring: in the upward lifting process, carrying out real-time weighing monitoring on the growing single crystal by using a high-precision weighing device, and adjusting growth parameters to maintain the stability and uniformity of the quality of the single crystal; compared with the prior art, the method has the following beneficial effects that by controlling the growth speed and the temperature gradient, defects and internal stress caused by thermal stress in the crystal growth process can be effectively reduced, and the integrity and the mechanical strength of the crystal are improved.

The present invention belongs to the technical field of magnetic materials, and specifically relates to a preparation method of a photo / thermal dual-mode switchable single-molecule magnet material. Dysprosium(III) chloride hexahydrate, 9-anthracene carboxylic acid, N,N-dimethylformamide and deionized water are mixed evenly. The mixture is placed in a 20 mL glass bottle. After hydrothermal reaction, it is naturally cooled to room temperature, filtered and washed to obtain the single-molecule magnet material. By utilizing the dual photoactive characteristics of the 9-anthracene carboxylic acid ligand, through the dual regulation mechanisms of photoinduced cycloaddition and electron transfer, while maintaining the integrity of the single crystal, the structural transformation of the single-molecule magnet from 0D to 1D is realized, and it is endowed with the dual magnetic switching functions of light control and thermal control, opening up a new way for the intelligent regulation and high-performance application of molecule-based magnetic materials. The preparation method has simple and efficient process, and the obtained substance has strong stability, is easy to scale up production, and has broad market prospects.

The present invention relates to the field of magnetic functional materials. The present invention discloses a use of a rare earth fluoride single crystal in magnetic refrigeration, a magnetic refrigeration method and a magnetic refrigeration device. A magnetocaloric material of the series is lithium rare earth fluoride, with the chemical formula of LiREF4, wherein RE is one or more of rare earth elements gadolinium, terbium, dysprosium, holmium, erbium, thulium and ytterbium. A magnetocaloric material single crystal of the series has extremely strong magnetic anisotropy. By applying a varying magnetic field of 0-20 kOe along the easy magnetization axis direction of the magnetocaloric material, LiGdF4, LiTbF4, LiHoF4, LiDyF4, LiErF4, LiYbF4 and LiTmF4 obtained isothermal magnetic entropy changes of 50.35 J·kg−1·K−1, 21.12 J·kg−1·K−1, 24.98 J·kg−1·K−1, 24.45 J·kg−1·K−1, 21.95 J·kg−1·K−1, 14.7 J·kg−1·K−1 and 0.692 J·kg−1·K−1, respectively, at 1.8K, 4K, 4K, 1.8K, 1.8K, 1.8K, and 18K. Wherein, the thermal conductivity of LiTbF4 and LiErF4 reaches 50 W·K−1·m−1 at 25K.

A luminescent heat-resistant and flame-retardant coating, its preparation method and application belong to the technical field of heat-resistant and flame-retardant materials. The coating comprises the following raw materials in percentage by weight: 30-40% of a first hydroxy acrylic resin, 10-15% of a second hydroxy acrylic resin, 5-10% of an amino resin, 20-30% of a modified flame retardant, 2-5% of a coated luminescent powder, 5-10% of hollow glass microspheres and the balance of a solvent; wherein, the modified flame retardant is an inorganic flame retardant modified by an amino silane coupling agent and hexachlorocyclotriphosphazene; the coated luminescent powder comprises an inner layer and a coating layer, the inner layer is strontium aluminate doped with europium and dysprosium, and the coating layer is alumina. The luminescent heat-resistant and flame-retardant coating of the invention has excellent flame retardant and smoke suppression effects, good heat resistance, water resistance and mechanical properties, and at the same time, the luminescent performance of the coating is stable, and it is suitable for use in fire-fighting equipment.

The invention discloses a series of high-stability negative temperature coefficient heat-sensitive materials based on seven-principal-element high-entropy rare earth stannate and application, and aims to solve the problem that existing stannate heat-sensitive materials with pyrochlore structures cannot meet long-term application in high-temperature environments. The series of heat-sensitive materials are prepared by mixing lanthanum trioxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide and tin dioxide with erbium oxide or ytterbium oxide respectively, and the preparation process comprises the steps of wet three-dimensional vibration ball milling, powder calcination, cold isostatic pressing, high-temperature sintering and the like. And finally obtaining the negative temperature coefficient heat-sensitive material with the pyrochlore structure. The electrical property parameters of the series of materials are as follows: B is equal to 13914-14067 + / -1.89% K, and rho 1500 DEG C is equal to 180.26-204.09 + / -1.38% omega.cm. The negative temperature coefficient heat-sensitive material has the negative temperature coefficient characteristic in the wide temperature range of 400-1500 DEG C and shows excellent high-temperature aging stability under the high-temperature condition of 1500 DEG C, and the resistance drift rate of the negative temperature coefficient heat-sensitive material is only 0.7% after an aging test for 500 hours.

To slow the rate of loss of coercivity in NdFeB magnets, the present application provides a high-coercivity NdFeB magnet, a method for preparing the magnet, and a cylindrical magnetic block made from the magnet. The magnets primarily comprise the following raw materials, by weight: 20-29% praseodymium-neodymium alloy, 0-2% copper, 0-2% zirconium, 0-2% cobalt, 0-2% niobium, 0-2% aluminum, 0-2% gallium, 1-5% dysprosium, and the balance iron. The present application has the advantage of slowing the rate of loss of coercivity in NdFeB magnets.

The invention relates to the technical field of tungsten alloy materials, in particular to a tungsten alloy wire and a preparation method and application thereof.The tungsten alloy wire is composed of, by mass, 0.4-1.1 wt% of L, 0.001-0.01 wt% of X, 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; x is one or more than two of lutetium, europium, ytterbium, dysprosium, holmium, terbium and samarium; the Z comprises oxygen; 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. According to the tungsten alloy wire, the linear element L is doped between the tungsten matrixes, the radial average width of L is controlled to be smaller than or equal to 5 nm, the wire diameter of the wire can range from 20 micrometers to 60 micrometers, the tensile strength of 5000 MPa or above can be achieved under the wire diameter of 60 micrometers, and the machining performance of the tungsten alloy wire is enhanced.

The invention discloses a modification method of a ternary positive electrode material. The modification method comprises the following steps: S1, carrying out a co-precipitation reaction on a solution of transition metal sulfate in an inert gas atmosphere; a sulfate solution of rare earth elements is synchronously added in the coprecipitation process, and a ternary precursor with the surface coated with rare earth hydroxide is formed; and S2, mixing the ternary precursor obtained in the step S1 with a lithium source, calcining in an air atmosphere, and cooling to obtain the fast ion conductor coated ternary positive electrode material, the rare earth elements are selected from one or more of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium; the transition metal sulfate is soluble salt of Ni, Co and Mn. The rare earth element sulfate is added in the coprecipitation process, the rare earth element hydroxide is precipitated on the surface of the precursor, the lithium source is removed after filtering and drying, uniform mixing is performed, and the ternary positive electrode material which contains the rare earth element and is uniformly coated with the fast ion conductor is obtained after calcination, so that side reactions on the surface of the material are reduced; and the cycling stability of the positive electrode material is improved.

A bond coat material providing unexpectedly high resistance to thermal cycle fatigue and sulfurization and unexpectedly extended thermal cycle life in the high temperature environment of a gas turbine engine component in the presence and absence of sulfur contains: a) 10 to 30 weight percent chromium, b) at least one of tantalum and molybdenum in a total amount of 3 to 15 weight percent, c) 5 to 13 weight percent aluminum, d) 0.1 to 1.4 weight percent silicon, e) 0.1 to 0.8 weight percent yttrium, f) 0 to 1.2 weight percent carbon, g) 0 to 1 weight percent dysprosium, h) 0 to 1 weight percent cerium, i) the balance being nickel, and the percentages of a) through i) adding up to 100 weight percent. The total amount of tantalum and molybdenum and the amounts of aluminum and silicon are each critical to avoid delamination of the top coat from the bond coat.

Systems and methods are provided for separating or filtering magnetic nano scale particles (e.g., such as dysprosium (Dy), iron (Fe), yttrium (Y), cobalt (Co), nickel (Ni), and others) at the industrial scale with minimum energy consumption. A continuous, scalable flow system can be applied equally to the separation of paramagnetic particles and diamagnetic particles. The system can be continuous in the sense that the fluid can be continuously circulated through the separation chamber and, depending on the operating conditions, may not require multiple separation steps. At the same time, the system can be scaled up to industrial applications to separate magnetic particles from a large volume of fluids, for example at a rate of a few cubic meters per hour (m3 / hr).

A dielectric ceramic composition includes a barium titanate (BaTiO3)-based base material main ingredient and an accessory ingredient, the accessory ingredient including dysprosium (Dy) and praseodymium (Pr) as first accessory ingredients. A content of the Pr satisfies 0.233 mol≤Pr≤0.699 mol, based on 100 mol of the barium titanate base material main ingredient.

The utility model discloses a magnetic steel surface dysprosium infiltration device which comprises a machine frame, a rectangular installation frame is arranged on the machine frame, a dysprosium infiltration reaction cavity is arranged in the rectangular installation frame in a rotating mode, and a limiting structure is arranged in the dysprosium infiltration reaction cavity. A driving motor is arranged at one end of the dysprosium permeation reaction cavity; heat preservation structures are arranged on the upper and lower sides of the rectangular mounting frame; and a dysprosium source supply box is arranged below the rectangular mounting frame. The dysprosium permeation reaction cavity is rotationally arranged in the rectangular mounting frame, and one end of the dysprosium permeation reaction cavity is driven by the driving motor, so that magnetic steel can be in all-dimensional and uniform contact with a dysprosium source in the dysprosium permeation process; heat insulation structures on the upper and lower sides of the rectangular mounting frame can effectively reduce heat loss and maintain the stability of the temperature in the reaction cavity; a heating assembly arranged on the inner surface of the dysprosium permeation reaction cavity is electrically connected with a main control device on the top of the rack, and an operator can accurately regulate and control the working state of the heating assembly through the main control device.

The invention relates to a microbial growth activation accelerant based on rare earth elements as well as a preparation method and application thereof, and belongs to the field of resources and environments. The microbial growth activation accelerant based on the rare earth elements is prepared from the following components: 1 to 150g of a rare earth compound, 0.2 to 2g of pantothenic acid, 0.2 to 2g of nicotinic acid, 0.02 to 0.1 g of nicotinamide and 1000g of deionized water, the rare earth compound is one or combination of more of chlorides of lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium, scandium and yttrium, nitric acid compounds and sulfuric acid compounds. A large number of cheap light rare earth elements are used as raw materials of the microbial accelerator, a new utilization approach is provided for the light rare earth elements, the light rare earth elements are converted into high-added-value products, pollution of the light rare earth elements to the environment is reduced, and meanwhile new elements are introduced into the field of microbial accelerators. More importantly, the preparation method of the microbial growth activation accelerant based on the rare earth elements provided by the invention is simple in production process and convenient for large-scale production.

The present invention discloses a crystalline aluminosilicate small-pore zeolite having a maximum ring size of eight tetrahedral atoms, wherein the zeolite comprises copper, wherein the Cu: Al atomic ratio is between 0.12 and 0.55; and manganese, wherein the Mn: Cu atomic ratio is between 0.05 and 0.95; and a metal M, wherein M is selected from magnesium, calcium, barium, strontium, yttrium, titanium, zirconium, niobium, iron, zinc, silver, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and mixtures thereof, and wherein the M: Cu atomic ratio is between 0.05 and 0.80; and wherein the sum of the atomic ratios of copper, manganese and the metal M to aluminum, (Cu+Mn+M): Al, is between 0.20 and 0.80; and wherein the zeolite comprises at least 2.5 wt.-% of copper, calculated as CuO and based on the total weight of the zeolite. Catalyst substrate monoliths comprising the crystalline aluminosilicate zeolite are also disclosed. These catalyst substrate monoliths can be used in a process for the removal of nitrogen oxides from combustion exhaust gases, and they can be part of emissions treatment systems.