119 results about "Lanthanoid Series Elements" patented technology

The invention discloses a blue-and-white glaze and a preparation method and application thereof, and belongs to the technical field of inorganic non-metallic materials (ceramics), the blue-and-white glaze comprises quartz, feldspar, limestone, plant ash and other basic raw materials, zinc oxide, aluminum oxide, lanthanum oxide, cerium oxide and other rare earth elements, and a modified organic additive is introduced. Compared with the prior art, the blue-and-white glaze shows excellent stability in the drying and firing process, the phenomena of cracking and glaze stripping are effectively reduced, the friction coefficient after firing is low, the breaking strength and the breaking modulus are high, the glossiness and transparency of a glaze surface are remarkably improved, and the blue-and-white glaze has important application value.

The invention relates to the technical field of alloys, and discloses a high-strength silver-copper alloy and a preparation method thereof. The acidified carbon nanotubes are subjected to functional modification, methylbenzene-2, 4-diisocyanate reacts with surface active groups of the methylbenzene-2, 4-diisocyanate to introduce-NCO groups, then through hydroxyl reaction of-NCO and 4-hydroxyphthalic acid, a plurality of carboxyl groups are grafted on the surfaces of the carbon nanotubes, the carboxyl groups can firmly adsorb lanthanum nitrate through a coordination effect, and meanwhile, the carboxyl groups can also adsorb lanthanum nitrate through a coordination effect. The rare earth elements are prevented from being separated from the raw materials in the ball milling process, uniform distribution is ensured, the agglomeration tendency of the carbon nanotubes can be reduced, and the dispersity of the carbon nanotubes in the silver-copper alloy is improved; the carbon nanotubes have extremely high axial strength and excellent conductivity, the mechanical and electrical properties of the alloy material can be enhanced through load transfer and a conductive network effect, rare earth lanthanum is segregated at a grain boundary to form a pinning effect to refine grains, the alloy strength is further improved, and finally collaborative improvement of the strength and the conductivity of the silver-copper alloy is achieved.

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 a catalyst for preparing trichlorosilane and a catalytic preparation method of trichlorosilane. The catalyst is prepared from the following components in percentage by mass: weighed copper nitrate, zinc nitrate, aluminum nitrate, lanthanum nitrate and the balance of a carrier, the preparation method comprises the following specific steps: S1, filling a catalyst; S2, purifying raw material gas; S3, reacting; and S4, separating and purifying a product, namely discharging a reacted gas product from an outlet of a reactor, and condensing through a condenser. In the prepared catalyst, the activity and selectivity of the catalyst are remarkably improved through the synergistic effect of the copper-zinc-aluminum composite oxide and the rare earth element lanthanum, the electronic structure and the surface acid-base property of the catalyst can be adjusted through doping of lanthanum, the reaction of silicon powder and hydrogen chloride is promoted, meanwhile, side reactions are inhibited, and the service life of the catalyst is prolonged. And the yield of trichlorosilane is improved.

The invention provides a rare earth silicon germanate scintillating material and a preparation method and application thereof, in particular to a rare earth silicon germanate scintillating material with high thermal stability and strong radiation resistance and a preparation method and application thereof, the general formula of the rare earth silicon germanate scintillating material with high thermal stability and strong radiation resistance is RE2 (1-x-delta / 2) Ce2xGedeltaSi (1-y + delta) Gey-deltaOz, in the formula, 0 lt; x is more than or equal to 0.05, y is more than or equal to 0.15 and less than or equal to 0.5, delta is more than or equal to 0 and less than or equal to 10 <-4 >, z is more than or equal to 4.95 and less than or equal to 5.05, RE represents a rare earth element, and the rare earth element is selected from at least one of lanthanum (La), lutetium (Lu), yttrium (Y) and gadolinium (Gd). The rare earth silicon germanate scintillating material provided by the invention has the characteristics of strong radiation damage resistance, high scintillation light output, low afterglow and the like while greatly improving the thermal stability, and can be used in occasions with extremely high requirements on the thermal stability or radiation resistance of the material, such as high-energy physical experiments, nuclear medicine imaging, oil exploration wells and the like.

The invention discloses a preparation process of a rare earth precipitation resistant electrophoretic coating for an automobile body. The preparation process comprises the following steps: S1, preparing a stable solution; s2, preparing a rare earth chelating solution; adding lanthanum lactate into the stable solution for multiple times, and adding ammonium ceric sulfate for multiple times after the lanthanum lactate is completely dissolved; s3, preparing a resin base solution; s4, preparing mixed slurry; s5, adding a solvent and an auxiliary agent; a five-membered ring chelate with thermodynamic stability is formed by carboxyl, hydroxyl and rare earth elements in sodium citrate, rare earth ions can be tightly wrapped through strong coordination bonds, namely, empty orbits of the rare earth ions and lone pair electrons of a chelating agent form coordination bonds, so that the rare earth ions cannot be dissociated in a system, and the rare earth ions are prevented from being dissociated in the system. And a path of generating hydroxide precipitates by free rare earth ions is thoroughly blocked, so that rare earth elements are effectively ensured to be uniformly distributed in the electrophoretic paint, and the surface of a raw material treated by a subsequent electrophoresis process is more uniform.

The invention belongs to the technical field of aluminum alloy grain refiners, and particularly relates to a grain refiner and a preparation method and application thereof.The preparation method of the grain refiner comprises the following steps that S1, aluminum powder, vanadium powder, boron powder and lanthanum powder are obtained; s2, after uniform mixing, vacuum ball milling is performed to obtain first powder, and the first powder is sieved to obtain second powder; s3, pressing the second powder to obtain a metal cake; s4, sintering the metal cake in an inert gas atmosphere to obtain a grain refiner; the Al-V-B-La refiner is prepared through a sintering method, the distribution condition of a second phase in the grain refiner and the grain refining effect of the grain refiner are improved through the rare earth element La, the VB2 phase in the grain refiner with the La element added is more uniform in distribution, smaller in size and larger in number density, more second phases can play a role in refining, and the grain refining effect of the grain refiner is improved. And the problem that the refining efficiency is low due to the Si poisoning problem of a traditional grain refiner is solved, and therefore the better aluminum alloy grain refining effect is 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 relates to an A-site high-entropy double perovskite anode material and a preparation method and application thereof. The chemical general formula of the anode material is (Ln < 1 > < 0.2 > Ln < 2 > < 0.2 > Ln < 3 > < 0.2 > Ln < 4 > < 0.2 > Ln < 5 > < 0.2 >) A 'B2O5 + delta (wherein delta is greater than or equal to 0 and less than or equal to 1). Wherein Ln1 to Ln5 are five different lanthanide rare earth elements and jointly occupy the A site, and the A site elements are any five of Sm, Pr, Nd, La, Gd, Eu, Er, Dy, Te, Yb, Y and Sc; the A'site is composed of any two elements of Ba, Sr and Ca; and the B site is Co. According to the invention, the double perovskite structure can be effectively stabilized, the number of catalytic active sites of an OER reaction is increased, the TEC of a cathode is effectively reduced, the electro-catalysis ORR reaction activity is increased, the performance of hydrogen production by electrolysis of water of a single cell is improved, and the output stability of the cell is effectively enhanced.

The invention provides a modified charcoal-based slow-release rare earth lanthanum soil conditioner and a preparation method thereof, and relates to the technical field of soil conditioners, the saline-alkali soil conditioner is used for reducing soil salinity and alkalinity, fixing heavy metals in soil, improving soil structure and slowly releasing rare earth elements into soil; the preparation method comprises the following steps: 1, preparing a rare earth lanthanum compound; modifying the biochar; a phosphate; dewatering the river sludge; an organic complexing agent; step 2, dissolving a rare earth lanthanum compound and an organic complexing agent in deionized water, and reacting to generate a complex solution; step 3, preparing modified biological carbon; step 4, loading lanthanum; and step 5, mixing the matrix to obtain the saline-alkali soil conditioner. Lanthanum nitrate and sodium citrate are converted into a complex solution, the lanthanum citrate complex has good stability, lanthanum can be effectively fixed in the solution in the form of the complex, the lanthanum is prevented from precipitating or losing in the subsequent treatment process, and the slow release effect of lanthanum is achieved.

The application provides a variable-price rare earth element doped black titanium dioxide catalyst and a preparation method and application thereof, and belongs to the technical field of environmental functional materials and water pollution treatment. The catalyst is prepared by a sol-gel method combined with calcination in a hydrogen-argon mixed atmosphere, with tetrabutyl titanate as a titanium source and lanthanum nitrate and cerium nitrate as rare earth doping sources. Lanthanum / cerium doping can effectively inhibit the generation of rutile phase in the black titanium dioxide, increase the specific surface area, narrow the band gap and construct oxygen vacancy defects, and significantly improve the photocatalytic activity. The preparation process is simple, the cost is controllable, the catalyst has a remarkable selective degradation effect on specific dyes, and an efficient solution is provided for dye wastewater treatment.

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 application relates to the technical field of metallurgical chemical industry, in particular to a silicon-manganese alloy smelting method, comprising the following steps: raw material pretreatment, gradient reduction smelting, tapping and refining, and flue gas slag cooperative treatment.In the silicon-manganese alloy smelting, lanthanum cerium oxides in the rare earth composite material react with impurities such as sulfur, phosphorus and oxygen in the melt at high temperature, forming high-melting-point compounds and separating with the molten slag, effectively reducing the impurity content, at the same time, the rare earth elements segregate at the grain boundaries, inhibiting atomic diffusion and migration, significantly refining the alloy grain size, and the rare earth composite material is optimized through the dual action of chemical purification and physical modification, solving the problems of impurity segregation and insufficient toughness in the traditional silicon-manganese alloy smelting process, and significantly improving the mechanical properties of the silicon-manganese alloy.

The application relates to the alloy technical field and discloses a high-strength silver-copper alloy and a preparation method. Acidified carbon nanotubes are functionally modified, -NCO groups are introduced by reacting toluene-2,4-diisocyanate with surface active groups, and a plurality of carboxyl groups are grafted on the surface of the carbon nanotubes by reacting the -NCO groups with the hydroxyl groups of 4-hydroxyphthalic acid. The carboxyl groups can firmly adsorb lanthanum nitrate through coordination, avoid the separation of rare earth elements in the ball milling process with raw materials, ensure the uniform distribution, reduce the carbon nanotube agglomeration tendency, and improve the dispersity of the carbon nanotubes in the silver-copper alloy. The carbon nanotubes have extremely high axial strength and excellent conductivity, the load transmission and the conductive network effect can enhance the mechanical and electrical properties of the alloy material, the rare earth lanthanum is segregated at the grain boundary to form a pinning effect to refine the grains, the alloy strength is further improved, and the strength and the conductivity of the silver-copper alloy are synergistically improved.

The invention discloses lanthanum-doped aluminum oxide composite grinding powder and a preparation method thereof, and relates to the technical field of aluminum oxide grinding powder, the aluminum oxide grinding powder has high grinding efficiency, is suitable for grinding and polishing materials such as metal, glass and ceramic, and has wide applicability; lanthanum serving as a rare earth element is doped into the aluminum oxide grinding powder, so that growth of aluminum oxide grains can be better inhibited, and the high temperature resistance of the grinding powder is improved; the lanthanum-doped aluminum oxide grinding powder has higher wear resistance, the oxygen vacancy concentration on the surface of aluminum oxide can be adjusted by doping lanthanum, and the polishing performance of the grinding powder is optimized.

The present invention provides defect-controlled fluoride crystals, a method for producing the same, and the use thereof. These fluoride crystals contain at least a rare earth element RE (RE is at least one element selected from the group consisting of cerium (Ce), praseodymium (Pr), lanthanum (La), and neodymium (Nd)), fluorine (F), and hydrogen (H), and have the same crystal structure as crystals represented by CeF3. A method for producing fluoride crystals according to the present invention comprises growing crystals from a raw material containing a rare earth element RE and a raw material containing fluorine (F) by a solvothermal method in the presence of at least one mineralizer selected from the group consisting of mineralizers containing an alkali metal element and / or an alkaline earth metal element, acid mineralizers, and mineralizers containing a normal salt.

Disclosed herein are rare earth element (REE) sensors comprising an REE binding element and a fluorescent component, which can be expressed on a cell surface. Also disclosed are systems and methods of recovering rare earth elements from a sample, the method comprising exposing an aqueous solution comprising one or more rare earth elements. Also disclosed are methods of discovering new, useful REE binding elements.

Disclosed is a composition comprising at least a cerium and zirconium based mixed oxide comprising zirconium, cerium, lanthanum and optionally at least one rare earth other than cerium and lanthanum; said mixed oxide exhibiting a high thermal resistance and are in particular capable of maintaining a large specific surface area even in a high temperature environment. Also disclosed is a process for the synthesis of such compositions.

The invention belongs to the technical field of metal material processing, and particularly relates to a chemical corrosion forming method of a titanium alloy straight rib pipe. In order to overcome the defects that in the prior art, a titanium alloy straight rib pipe is complex in manufacturing process, high in cost and poor in flexibility, the titanium alloy straight rib pipe manufacturing method comprises the steps that firstly, rare earth elements lanthanum and yttrium are added, and a titanium alloy pipe good in toughness, heat stability and fatigue performance is obtained through multiple times of vacuum melting; plating a metal protective film; carrying out chemical corrosion forming on a part which is not covered by the mask by utilizing an acidic corrosive liquid; and finally, the metal protective film on the surface of the pipe is removed through chemical stripping, surface finishing is conducted, and the titanium alloy straight rib pipe with the accurate size and various complex shapes is obtained. The method is easy to operate, low in cost, high in design freedom degree and suitable for small-batch and multi-variety customized production requirements; and the used electroplating liquid and corrosive liquid can be recycled, and the concept of green and sustainable development of the modern manufacturing industry is met.

The invention discloses a special ultrahigh corrosion-resistant high-pressure cast aluminum alloy for marine equipment and a preparation process of the special ultrahigh corrosion-resistant high-pressure cast aluminum alloy. The aluminum alloy is designed by taking aluminum as a matrix and synergistically adding silicon, magnesium, various transition elements and rare earth elements of cerium and lanthanum in a specific proportion. The preparation process sequentially comprises the steps of smelting and refining, high-pressure die casting, heat treatment and surface treatment. Through the unique component design and the systematic combination of the whole-process technology, the high-pressure casting manufacturability of the alloy is kept, meanwhile, the marine corrosion resistance and the mechanical property are comprehensively improved, and the alloy is suitable for structural parts such as marine ship engine parts in the severe environment.

The invention discloses a ceramic multi-surface metallization process optimization method and a metallized ceramic piece, and the ceramic multi-surface metallization process optimization method comprises the following steps: S1, ceramic surface pretreatment; s2, preparing a metallized coating; s3, coating of a coating layer; s4, drying and pre-sintering the coating; s5, formal sintering; through the ceramic surface pretreatment and the optimized sintering process, good metallurgical bonding is formed between the metallized layer and the ceramic matrix, the bonding strength is remarkably improved, external stress can be effectively resisted, and the service life of the metallized ceramic part is prolonged; by adding the nano titanium dioxide coated carbon nanotubes, the conductivity and bonding strength of the coating can be improved; by adding lanthanum oxide, rare earth elements can improve the microstructure of the coating and improve the compactness and corrosion resistance of the coating; due to the addition of the nano graphene, the coating has excellent electrical properties and chemical stability, and the conductivity and oxidation resistance of the coating can be enhanced.

The invention belongs to the technical field of catalyst preparation, and relates to a lanthanide-doped flaky binary metal catalyst, in particular to a preparation method and application of a binary PdPr catalyst. A one-step synthesis method is adopted, Pd and a metal precursor of a rare earth element Pr are evenly mixed with molybdenum hexacarbonyl and an n-caprylic acid solvent, after an oil bath reaction is carried out for a period of time, centrifugal collection and drying are carried out, and the flaky binary metal catalyst can be obtained. The preparation method disclosed by the invention is simple, few in steps and simple and convenient to operate. The prepared flaky binary PdPr catalyst has more excellent catalytic activity and stability than a monometal Pd catalyst and Pd black in the aspect of value-added conversion of waste plastics, can upgrade and convert the waste plastics into glycollic acid, and has better selectivity and yield.

The invention discloses a rare earth doped perpendicular magnetic anisotropy oxide thin film and a preparation method thereof, and relates to the field of hard magnetic rare earth element doped oxide thin film materials, the rare earth doped perpendicular magnetic anisotropy oxide thin film has (001) plane crystal orientation and comprises a substrate and a thin film layer, the substrate is MgAl2O4 (001), and the thin film layer is LaxNi1-xCo2O4 (001). According to the rare earth doped perpendicular magnetic anisotropy oxide thin film and the preparation method thereof, lattice strain caused by mismatching of ion radius sizes can be overcome, lanthanum is doped into a crystal structure of spinel oxide NiCo2O4, a radio frequency magnetron sputtering preparation process is adopted, La0. 05Ni0. 95Co2O4 and La0. 1Ni0. 9Co2O4 target materials are adopted, and the rare earth doped perpendicular magnetic anisotropy oxide thin film is prepared. A series of La0. 05Ni0. 95Co2O4 and La0. 1Ni0. 9Co2O4 films with different thicknesses are prepared, the obtained films have stable vertical magnetic anisotropy, the Curie temperature is above room temperature, and the films have excellent conductivity and good performance.

The invention discloses a defoaming agent with long foam inhibition time and a preparation method thereof, and relates to the technical field of defoaming agents, and the defoaming agent comprises the following components in parts by mass: 35-40 parts of rare earth modified organosilicon, 20-25 parts of temperature-sensitive double-control gel, 10-15 parts of complex enzyme loaded microspheres and 25-30 parts of a quantum dot modified multifunctional polymer. The lanthanide rare earth element is introduced, so that the strong stability of the active component of the defoaming agent is realized, the problem of poor durability of the defoaming agent in an extreme environment is solved, the defoaming agent can quickly and permanently eliminate foam, and the efficiency of the whole production process is improved.

The application discloses a cathode filament, a cathode assembly, a magnetron and a microwave cooking appliance. The cathode filament has a spiral structure, and a filament material of the cathode filament comprises a filament core and a carbonized layer, the carbonized layer at least wraps the filament core in a circumferential direction of the filament core, a material of the filament core comprises lanthanum tungsten material, and the carbonized layer comprises a lanthanum tungsten carbonized layer. In the cathode filament, the material of the filament core comprises the lanthanum tungsten material, and the carbonized layer comprises the lanthanum tungsten carbonized layer, which reduces the work function of the cathode filament to a certain extent, improves the migration ability of rare earth elements in the cathode filament, and thus the electron emission ability of the cathode filament can be improved to a certain extent, so that the magnetron can adapt to more power requirements of the microwave cooking appliance.

The invention discloses a lanthanum-enhanced fluorine removal agent and a production and recovery method and application thereof, and belongs to the technical field of industrial wastewater treatment.The lanthanum-enhanced fluorine removal agent takes cellulosic fibers as an adhesive, alkaline earth metal salt inorganic powder as a basic adsorption component, and a compound of rare earth element lanthanum is additionally added as an active ingredient; the production process comprises three steps of mixing and stirring, forming and drying. The fluorine-containing wastewater is contacted with the fluorine removal agent, alkaline earth metal reacts with fluorine to generate insoluble fluoride, lanthanum compounds synchronously form a stable fluorine-lanthanum complex, and the fluorine ion concentration is reduced to 5 mg or below under the dual action; during fluorine recovery, a formed body adsorbing fluorine is separated, and a high-purity alkaline earth metal fluoride and lanthanum oxide mixed product is obtained after drying, sintering and cellulose removal, so that collaborative recovery of fluorine and rare earth resources is realized; the fluorine removal agent is good in raw material compatibility, controllable in preparation cost, high in fluorine removal efficiency and recovery rate and suitable for various fluorine-containing industrial wastewater treatment scenes.

The invention belongs to the field of novel corrosion-resistant materials for engineering facilities and equipment in a marine environment, has double functions of corrosion resistance and microorganism resistance, and relates to corrosion-resistant and microorganism-resistant double-function austenitic stainless steel containing rare earth element La as well as preparation and application of the corrosion-resistant and microorganism-resistant double-function austenitic stainless steel. The stainless steel comprises the following chemical components in percentage by weight: 19.5-20.5% of Cr, 17.5-18.5% of Ni, 5.5-6.5% of Mo, 0.75-0.85% of Cu, 0.5-2.0% of La, 0.18-0.22% of N, less than or equal to 0.03% of C, less than or equal to 0.5% of S i, less than or equal to 0.8% of Mn, less than or equal to 0.02% of P, less than or equal to 0.005% of S and the balance of Fe and inevitable trace impurities, and PREN =% Cr + 3.3 *% Mo + 16 *% N > = 45.

The invention discloses a method for synergistically and deeply purifying rare earth lanthanum and cerium in waste polishing powder pickle liquor, which is characterized in that rare earth elements and impurity elements are separated through double salt precipitation treatment, alkalization treatment, acidolysis treatment and extraction treatment in sequence; and then the first extraction phase is sequentially subjected to reverse extraction, oxalic acid precipitation and calcination, and the high-purity rare earth oxide is obtained. Compared with the prior art, the method for synergistically and deeply purifying the rare earth lanthanum and cerium in the waste polishing powder pickle liquor has the advantages that the separation and purification rate of the rare earth lanthanum and cerium is up to 99.9% or above, the operation is simple, the extraction effect of the cerium and lanthanum elements is good, the removal rate of impurity elements is high, and the like.

A multilayer ceramic capacitor includes a capacitor body having a dielectric layer and an internal electrode layer, and an external electrode disposed on an outer surface of the capacitor body. The dielectric layer contains a plurality of dielectric grains, at least one of which has a core-shell structure including a core portion and a shell portion that surrounds at least part of the core portion. The dielectric grain includes barium (Ba), titanium (Ti), and rare-earth elements including lanthanum (La). In a measurement region extending from the interface between the core and shell portions to a depth of about 5 nm into the shell portion, an absolute value of the concentration gradient of lanthanum (La) is approximately 0.12 to 0.58 parts by mole per nanometer, based on 100 parts by mole of titanium (Ti).

The application provides a steam turbine blade ultrahigh-temperature coating and a preparation method thereof, and relates to the technical field of material surface treatment, and comprises the following components in mass ratio: yttrium stabilized zirconium 20-30 parts, titanium aluminum nitride 15-20 parts, lanthanum magnesium aluminum spinel 10-15 parts, nano cerium oxide 5-10 parts, cobalt-based alloy 10-15 parts, rare earth element mixture 1-5 parts, hexagonal boron nitride 5-10 parts, SiC nano particles 5-10 parts, and chromium carbide 2-5 parts. The synergistic effect of the lanthanum magnesium aluminum spinel and the rare earth element mixture greatly reduces the grain growth rate of the coating at high temperature, thereby improving the stability at extreme temperature. The protective layer formed by the decomposition of the chromium carbide and the SiC nano particles jointly inhibit the sulfur corrosion, further improve the stability, and ensure the performance of the coating under high temperature conditions.