194 results about "Solid solution" patented technology

The invention discloses a high-entropy oxide for synergic nitrogen removal and catalysis as well as a preparation method and application thereof, and belongs to the technical field of material preparation, the high-entropy oxide is a single solid solution phase formed by five or more metal elements of Fe, Co, Ni, Cu, Mn, Ti and Ce and an oxygen element, the configuration entropy of the high-entropy oxide is greater than or equal to 1.5 R, R is a gas constant, and R is an oxygen constant. The mole fraction of each metal element is 0.1-0.3, and the sum of the mole fractions of the metal elements is 1. According to the high-entropy oxide with the synergistic nitrogen removal and catalysis effects and the preparation method and application thereof, a synergistic catalysis system is constructed through the high-entropy oxide and silicon carbide, and the high-entropy oxide has the multiple advantages of being high in nitrogen removal efficiency, high in stability, simple in process, environmentally friendly and wide in application range; the removal rate of total nitrogen and key nitrogen pollutants can reach 90% or above in the seawater high-salt environment, and the environment-friendly emission requirement is met.

The invention discloses a titanium alloy based on lamellar alpha phase and nanophase precipitation and a preparation method of the titanium alloy, belongs to the field of titanium alloy materials, and aims to solve the bottleneck that strength and work hardening of a high-strength titanium alloy are difficult to cooperate. The titanium alloy comprises, by weight, 2.0%-7.5% of Al, 1.0%-6.0% of V, 1%-8% of x (x is at least one eutectoid beta stable element of Fe, Mn, Cr, Ni and Cu) and the balance Ti and impurities. And the beta-phase molybdenum equivalent [Mo] eq is controlled to be 5.0-10.0. The preparation method comprises the following steps: 1) smelting an ingot for three times in a vacuum consumable electric arc furnace, and cutting a dead head after scaling and flaw detection; (2) carrying out hot rolling at 810-950 DEG C in an alpha + beta two-phase region with the accumulative deformation amount of 75-95%, and constructing a multi-scale lamellar alpha phase, and (3) carrying out solid solution for 30-120 minutes at 700-850 DEG C, rapidly cooling at 50-250 DEG C / s, and inducing the precipitation of a nano eutectoid compound. Aging treatment is not needed, the yield strength is greater than 900 MPa, the work hardening amount is greater than 150 MPa, the elongation is greater than or equal to 15%, the process is simple and easy to industrialize, and the method can be applied to the fields of aerospace, ocean engineering and the like.

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 application provides a ceria / yttria composite stabilized zirconia grinding medium and a preparation method. The method comprises the following steps: step one, mixing zirconia, ceria, yttria and kaolin, and then adding an appropriate amount of dispersant and water to obtain a slurry; step two, performing centrifugal spray drying on the slurry to obtain ceria / yttria composite stabilized zirconia powder; step three, adding the ceria / yttria composite stabilized zirconia powder into a binder, and then rolling to form a green body of spherical grinding medium; and step four, sintering and polishing the green body of spherical grinding medium to obtain the ceria / yttria composite stabilized zirconia grinding medium. The method can obtain low particle size and high specific surface area through high-temperature ball milling, and can also promote the solid solution of the stabilizer into the zirconia crystal lattice through heat treatment, so as to improve sintering activity, reduce sintering temperature and reduce production cost.

The present application belongs to the technical field of metal materials, and particularly relates to a method for in-situ measuring MC carbide solid solution and precipitation temperature by internal friction. The present application uses pure iron and pure chromium to prepare Fe-Cr based alloy samples, processes the samples into internal friction samples after solid solution and rolling; in a vacuum environment, the samples are heated to a preset target temperature covering the expected solid solution characteristic temperature range of MC carbide at a constant rate and are kept at the temperature, then are cooled at the same rate, the internal friction value and modulus are continuously measured, and a first and second in-situ internal friction temperature spectrum is drawn; the frequency dispersion characteristics of grain boundary relaxation peak, the internal friction value mutation and the modulus change in the two temperature spectra are compared to determine the solid solution temperature and precipitation temperature of MC carbide. The method has high sensitivity and simple operation, and is suitable for in-situ characterization of grain boundary precipitates in low carbon content Fe-Cr based alloys.

The invention belongs to the technical field of photocatalysts, and particularly relates to a sulfur nickel selenide cocatalyst, a photocatalyst and a preparation method and application of the sulfur nickel selenide cocatalyst, and the preparation method of the sulfur nickel selenide cocatalyst comprises the steps that a soluble nickel source, a soluble sulfur source and a soluble selenium source are dispersed in an alcohol solvent to be mixed, a reaction is conducted for 10-20 h at the temperature of 160-200 DEG C, and the sulfur nickel selenide is obtained after washing and drying; the molar ratio of the soluble nickel source to the soluble sulfur source to the soluble selenium source is 1: (0.5-1.5): (0.5-1.5). In the cocatalyst, Se is introduced into a NiS2 structure, lattice spacing is increased, a replacement solid solution NiSexS2-x is formed, in the solid solution, Se atoms replace S atoms in an atomic level and enter NiS2 lattices instead of being simply attached to the surface of NiS2 or forming heterojunctions, a single-phase and uniform crystal structure is formed instead of physically mixed two phases, and the structure is stable.

The application provides a heat treatment method of a Ni30 high-temperature alloy, and comprises the following steps: S1: producing an electrode bar: according to the chemical composition of the Ni30 alloy, metal raw materials are loaded into a non-vacuum induction furnace, current heating is carried out to melt at 1500-1600 DEG C, then pouring is carried out in an ingot mold, mold cooling is carried out, then demolding is carried out, and then air cooling is continuously carried out to room temperature, so that a solid solution electrode bar is obtained; S2: high-temperature solid solution: the solid solution electrode bar obtained in the step S1 is loaded into a heating furnace, heating is carried out to 1050-1150 DEG C, and then holding is carried out for 4-8 hours, then the furnace is discharged, and water cooling is carried out to room temperature, so that a solid solution electrode bar is obtained; S3: electroslag remelting smelting: the solid solution electrode bar obtained in the step S2 is subjected to electroslag remelting smelting, so that an electroslag ingot is obtained, and preparation is completed. Through the application, the problem that the Ni30 high-temperature alloy electrode bar prepared by the conventional heat treatment method has large stress, the process parameters are unstable in the electroslag remelting process, the quality of the electroslag ingot is unstable, and the material yield of forging is low is solved.

The invention provides an IN738LC high-temperature alloy and a laser additive manufacturing method, and the IN738LC high-temperature alloy comprises the following components in percentage by mass: 0.08 to 0.13 percent of C, 15.70 to 16.30 percent of Cr, 8.00 to 9.00 percent of Co, 2.40 to 2.80 percent of W, 1.50 to 2.00 percent of Mo, 3.20 to 3.70 percent of Al, 3.00 to 3.70 percent of Ti, less than or equal to 0.07 percent of Fe, 0.60 to 1.10 percent of Nb, 1.50 to 2.00 percent of Ta, 0.005 to 0.015 percent of B, 0.05 to 0.150 percent of Zr, less than or equal to 0.30 percent of Si, less than or equal to 0.20 percent of Mn, less than or equal to 0.015 percent of P, less than or equal to 0.015 percent of S, less than or equal to The composition of the IN738LC high-temperature alloy powder is optimized, and the forming quality of a complex component is improved; and the heat treatment method of the IN738LC high-temperature alloy for additive manufacturing is optimized, the uniformity of a microscopic structure is improved, and the high-temperature mechanical property of a component is improved. Compared with the prior art, the technical scheme can solve the technical problems that in the prior art, an IN738LC powder forming part is prone to generating cracks, gaps and other defects, and the product performance and the service life are affected due to the fact that the IN738LC powder forming part cracks in the solid solution heat treatment stage.

The application discloses a kind of high plasticity single crystal high-entropy high-temperature alloy without Fe and Ti and a preparation method thereof.The chemical composition of the alloy includes Co, Ni, Cr, Al, Ta, Mo and W seven elements, and the atomic percentage of each element is Co 35-45at%, Ni 30-40at%, Cr 3-5at%, Al 10-13at%, Ta 1-4at%, Mo 1-3ar% and W 3-5at%.The preparation method includes the following steps: sequentially putting elemental Co, Ni, Cr, Ta, Mo and W into the crucible of vacuum induction melting furnace for heating and melting, adding elemental Al when the temperature rises to the refining temperature, and pouring into master alloy ingot;using high-speed solidification Bridgeman method and seed crystal method to prepare single crystal high-entropy high-temperature alloy test rod with <001> grain orientation;and sequentially carrying out solid solution treatment, primary aging and secondary aging on the single crystal high-entropy high-temperature alloy test rod, to obtain the high plasticity single crystal high-entropy high-temperature alloy without Fe and Ti.The single crystal high-entropy high-temperature alloy of the application has the advantages of high-entropy alloy and single crystal high-temperature alloy, and has excellent room temperature and high temperature mechanical properties.

The invention relates to the technical field of target materials, in particular to a rare earth modified IZO-doped target material and a preparation method and application thereof.The rare earth modified IZO-doped target material comprises, by mole, 10%-35% of ZnO, 1%-5% of rare earth oxide and the balance In2O3, and the rare earth oxide is one or a mixture of Gd2O3 and Y2O3. Gd2O3 and Y2O3 are accurately selected as rare earth doping elements, the ion radiuses of the Gd2O3 and Y2O3 are similar to those of In3, the Gd2O3 and Y2O3 easily enter IZO crystal lattices to form a solid solution, and meanwhile, the Gd2O3 and Y2O3 are matched with the plasma-modified nano Al2O3-SnO2 composite filler to generate a synergistic effect that rare earth elements refine grains, inhibit defect diffusion, fill grain boundary gaps and enhance interface bonding force.

The invention discloses a composite precipitation strengthened ultrahigh-strength invar steel wire and a preparation method thereof. The composite precipitation strengthened ultrahigh-strength invar steel wire comprises the following chemical components in percentage by mass: 0.21%-0.25% of C, 36.5%-38.5% of Ni, 0.7%-1.3% of Mo, 0.3%-0.6% of V, 0.8%-1.2% of Nb, 1.2%-1.6% of Ti and the balance of Fe and inevitable impurities. A steel ingot is prepared through the working procedures of an electric furnace, an LF furnace, a VD furnace and an electroslag furnace, and then the steel ingot is forged into a square billet; then the square billet is hot-rolled into a steel wire rod with the diameter being 13-15 mm; the wire rod is subjected to solid solution heat treatment and then water-cooled to the room temperature, and surface oxide skin is removed; the wire rod is subjected to cold drawing to form a wire rod with the diameter being 4.5-6.0 mm; carrying out aging heat treatment on the cold-drawn wire; and finally, the wire subjected to aging heat treatment is cold-drawn again to form a wire with the diameter phi of 1.5-3.5 mm. By controlling the production process of the whole process and parameters of key nodes, the ultrahigh-strength invar steel wire material with the tensile strength larger than or equal to 1750 MPa, the thermal expansion coefficient smaller than or equal to 2.7 * 10 <-6 > / DEG C at the room temperature to 230 DEG C and the thermal expansion coefficient smaller than or equal to 9.8 * 10 <-6 > DEG C at the 230-290 DEG C is obtained.

Provided is a cubic boron nitride sintered body comprising 40-85 vol% of cubic boron nitride particles and 15-60 vol% of a binder, wherein: the binder includes a compound comprising at least one element selected from the group consisting of group 4 elements, group 5 elements, group 6 elements, and aluminum, and at least one element selected from the group consisting of nitrogen, carbon, boron, and oxygen, and at least one solid solution selected from the group consisting of solid solutions derived from the compound; and the Raman spectrum of the cubic boron nitride sintered body has one or both of a first peak present at a Raman shift of 1048 cm-1 to 1062 cm-1, and a second peak present at a Raman shift of 1076 cm-1 to 1090 cm-1.

The invention belongs to the technical field of alloy heat treatment, and particularly relates to a cobalt-based high-temperature alloy pipe, a preparation method and a high-temperature component. The invention discloses a preparation method of a cobalt-based high-temperature alloy pipe. The cobalt-based high-temperature alloy pipe comprises the following components in percentage by weight: 0.05%-0.15% of C, 0.2%-0.5% of Si, less than or equal to 1.50% of Mn, less than or equal to 0.020% of P, less than or equal to 0.010% of S, 20.0%-24.0% of Cr, 20.0%-24.0% of Ni, 13.0%-16.0% of W, less than or equal to 3.0% of Fe, 0.02%-0.12% of La and the balance of Co and inevitable impurities. And then ingot casting, electroslag remelting, forging cogging, hot extrusion cogging, intermediate pipe cold machining, intermediate pipe solid solution heat treatment, finished product cold machining, finished product solid solution heat treatment and finishing are conducted, and finally the cobalt-based high-temperature alloy pipe is obtained.

The invention discloses a catalyst for preparing methanol through high-temperature CO2 hydrogenation as well as a preparation method and application of the catalyst. The active component of the catalyst is a Mn-doped ZnZrO2 solid solution, and the catalyst is prepared by adopting a crystal growth regulation and control-in-situ topological conversion method: by taking an amphiphilic block copolymer or CTAB (Cetyltrimethyl Ammonium Bromide) as a template, inducing directional crystallization of a precursor through solvothermal to construct a hierarchical porous structure; topological transformation is realized through staged heat treatment, so that the Mn element is uniformly doped in the crystal lattice of the catalyst in an atomic scale; the surface of the catalyst is reconstructed through oxidation and reduction treatment, and the oxygen vacancy density and the acid-base property distribution are accurately regulated and controlled. Experimental results show that the CO2 conversion rate of the catalyst is gt at the high temperature of 280-350 DEG C; the methanol selectivity is gt; the space-time yield reaches more than 700 mg / (gcat.h <-1 >), and the performance is reduced by 1t after 200 hours of operation; 3%. The key problems that the catalyst is easy to sinter at high temperature, the active site distribution is uneven, the methanol selectivity is low and the like are effectively solved, and a high-performance and stable catalyst system is provided for efficient resource utilization of CO2.

The present application belongs to the technical field of metallurgy, and particularly relates to a 590MPa grade hot-dip galvanizing dual-phase steel and a production method thereof. The chemical components of the steel are as follows in percentage by mass: C: 0.02%-0.06%, Si: 0.01%-0.03%, Mn: 0.90%-1.8%, P: 0.025% or less, S: 0.010% or less, Al: 0.005%-0.010%, Cr: 0.05%-0.30%, Mo: 0.05%-0.30%, O: 0.0060% or less, N: 0.010%-0.020%, and the rest is Fe and inevitable impurities. The present application has the advantages that: the component design of the present application adopts low-carbon-silicon-aluminum and high-nitrogen for synergistic regulation, and in the hot-rolling process, the premature precipitation of AlN particles in the hot-rolling process is effectively inhibited by controlling a lower coiling temperature, so that the nitrogen element is retained in a large amount in the hot-rolled plate in a solid solution state.

A preparation method of submicron powder of high-entropy nitride via nitride thermal reduction with mechano-chemical assistance, comprising material preparation—grinding—activation—preforming—reaction. In the present invention, high-entropy metal nitride and silicon nitride is used as raw materials, soft mechanochemical activation technologies are used to reduce reaction activation energy of the system, thereafter, by thermal reduction of the nitride, high-purity high-entropy nitride powder is prepared with solid phase methods, and the shortage of high-purity high-entropy nitride powder is addressed. There is no impure phase in the (Hf0.2Zr0.2Ti0.2Nb0.2Ta0.2)N high entropy powder prepared according to the present invention, and a single phase solid solution of good crystallinity is formed, and distribution of elements and ingredients in the powder is even, no foreign element is present, and oxygen content is controlled to be less than 0.3%.

The invention discloses a high-entropy Friedel's salt fluorine removal agent as well as a preparation method and application thereof, and belongs to the technical field of wastewater treatment and environmental functional material preparation. The invention solves the problems of weak selectivity, low adsorption capacity, poor stability and the like of the existing defluorination material. Through co-doping of multiple metal ions including Bi, Fe, Mg, Ti and Zr, a high-entropy solid solution structure is formed in mayenite crystal lattices, then the crystal lattice distortion and charge imbalance effect is generated, the diversity and activity of surface sites are remarkably improved, and the affinity and exchange capacity of the fluorine removal agent to fluorine ions are improved. Experimental results show that the fluorine removal efficiency of the prepared high-entropy Friedel's salt fluorine removal agent on a fluorine-containing water sample with the initial concentration of 350 mg / L can reach 95% or above, and is far higher than that of an undoped fluorine removal agent (53.2%). In addition, the fluorine removal agent is simple in preparation process and easy to industrially amplify, and has good environmental benefits and wide application prospects.

The invention belongs to the technical field of metal ceramic, and particularly relates to a ternary boride metal ceramic and a preparation method thereof.The ternary boride metal ceramic comprises 90-95 wt% of a principal crystalline phase and 5-10 wt% of a binding phase, the principal crystalline phase is (Mo, W) 2 (Fe, Co and Ni) B2, the A site of the principal crystalline phase is composed of Mo and W elements, the B site of the principal crystalline phase is composed of Fe, Co and Ni elements, a stable single-phase solid solution is jointly formed, and the binding phase is a single-phase solid solution. The binding phase comprises at least one of elements Fe, Ni and Co. The preparation method comprises the steps of ball milling, drying, sintering and the like. The ternary boride metal ceramic prepared by the invention has excellent hardness, toughness, wear resistance and thermal stability, so that the ternary boride metal ceramic has longer service life and can meet more harsh service conditions.

The invention relates to a preparation method of high-purity and high-toughness hot work die steel, which comprises the following steps: S1, electric furnace smelting; s2, refining in a ladle refining furnace; s3, refining in a vacuum refining furnace; s4, performing die casting on an electrode blank; s5, annealing the electrode blank; 6, electroslag remelting is conducted, specifically, an electrode blank is adopted, surface polishing is conducted, a calcium fluoride, aluminum oxide, magnesium oxide and silicon dioxide quaternary slag system is adopted for smelting, the starting point melting speed value of the electroslag smelting steady-state stage is 7-10 kg / min, the end point melting speed value of the electroslag smelting steady-state stage is 5.0-8.0 kg / min, an electroslag ingot is obtained, and then power-off furnace cooling is conducted for 80-100 min; s7, forging is conducted; s8, pretreatment after forging; and S9, solid solution and spheroidizing final treatment. According to the invention, on the basis of common hot work die steel H13, the prepared product has excellent high hardness, high purity and high toughness through fine adjustment of chemical components and special smelting, forging and heat treatment processes. The anti-cracking performance of a mold made of the material is greatly improved, the service life of the mold is prolonged, and meanwhile the use cost of the mold is greatly reduced.

The invention discloses a high-entropy sulfide solid electrolyte and a preparation method thereof. The method comprises the following steps: weighing raw materials and carrying out ball milling; pressing to obtain a cold-pressed mixed precursor sheet; carrying out staged sintering on the cold-pressed mixed precursor sheet; quickly cooling; and grinding to obtain the high-entropy sulfide solid electrolyte. According to the embodiment, the high-entropy single-phase solid solution with high ionic conductivity and high interface stability is successfully prepared by adopting a collaborative process of stepped sintering and rapid quenching after sintering. A plurality of solid precursor sources are fully mixed through high-energy ball milling and then are subjected to stepped solid-phase sintering in a sealed environment. In the sintering process, a multi-stage heating and heat preservation process is adopted to ensure that each precursor source component can be uniformly heated and fully reacted in each temperature control stage, so that the formation of the high-entropy single-phase solid solution is effectively promoted.

The application provides a method for preparing lead sulfide from a complex lead sulfide ore, and belongs to the technical field of lead sulfide preparation. The complex lead sulfide ore is subjected to vacuum distillation to obtain crude lead sulfide; the temperature of the vacuum distillation is 700-1200 DEG C, the time is 30-120 min, and the vacuum degree is 1-10 Pa; the crude lead sulfide is mixed with an alkaline solution to perform alkaline leaching, solid-liquid separation, and then lead sulfide pure product is obtained. In the application, the temperature and heating time are controlled under vacuum conditions, the structure of the solid solution in the original mineral is broken, the lead sulfide is volatilized alone, preliminary separation is realized, and then the lead sulfide with high purity is obtained through the wet leaching method. The examples show that the purity of the lead sulfide obtained through the vacuum distillation-alkaline solution leaching method is 90-98%, the Sb content is 0.5-3%, the lead sulfide has high purity, and the lead sulfide is directly obtained from the complex lead sulfide ore.

The invention relates to the technical field of radioactive waste treatment, and provides a metal solidified body analysis method which comprises the following steps: acquiring a plurality of samples from a plurality of set positions of a metal solidified body; part of the sample is dissolved to prepare an analysis solution, and the other part of the sample is prepared to form an observation surface; obtaining the concentration of a target component in each analysis solution, wherein the target component comprises a zirconium element; based on the concentration of the target component in each analysis solution, obtaining the average concentration and data discrete index of the target component; performing microscopic observation on each observation surface to obtain the volume percentage of a Fe-Zr intermetallic compound phase and the volume percentage of an iron-based solid solution phase in each sample with the observation surface; it is determined whether the volume percent of the Fe-Zr intermetallic compound phase satisfies a first threshold range and whether the volume percent of the iron-based solid solution phase satisfies a second threshold range. By analyzing the target components, the Fe-Zr intermetallic compound phase and the iron-based solid solution phase, the performance of the metal solidified body product is verified.

The invention discloses a high-strength Ti-Cr-V-Al-Zr series titanium alloy and a preparation method thereof, and belongs to the technical field of metal materials. The titanium alloy comprises, by mass, 5.0%-6.0% of Cr, 7.0%-9.0% of V, 5.0%-7.0% of Al, 7.0%-10.5% of Zr, smaller than or equal to 0.15% of O and the balance Ti and impurities. The preparation method comprises the steps that raw materials are mixed and then subjected to cold crucible magnetic levitation smelting under high-purity argon, the induction current ranges from 450 A to 500 A, and the frequency ranges from 20 kHz to 25 kHz; then cogging forging, beta-phase region forging and two-phase region multi-directional forging are conducted in sequence; and finally, carrying out solid solution at 760 DEG C for 60 minutes, carrying out water quenching, aging at 480-520 DEG C for 120 minutes, and carrying out air cooling. Through reasonable composition proportion, on the premise that expensive refractory elements such as Mo and Nb are removed, a multi-scale alpha / beta composite structure is formed through the synergistic effect of Zr and Al, and the structure uniformity is controlled in cooperation with a specific smelting and forging process, so that the yield strength of the alloy reaches 1550-1737 MPa, the tensile strength is 1613-1778 MPa, the ductility is 5.1-9.4%, and the alloy has excellent comprehensive mechanical properties and cost advantages and is suitable for industrial production. The method is suitable for high-performance structural members in the fields of aerospace and the like.

The invention belongs to the field of novel materials, and discloses an amorphous whisker material and a preparation method thereof, and the method comprises the steps of Fe-Cr-B cast steel hot dip coating of Al-Ga-Si alloy, diffusion heat treatment and ZnCl2 molten salt corrosion. Fe-Cr-B cast steel is subjected to Al-Ga-Si alloy hot dipping-diffusion heat treatment, then a periodic lamellar structure formed by alternately arranging Cr-(Al, Ga)-B MAB phase solid solutions and FeAl3 is generated on a (Cr, Fe) 2 / Al-Ga alloy melt solid-liquid interface, and after the cross section is subjected to polishing treatment, amorphous Al (Ga) solid solution whiskers can spontaneously grow on the Cr-(Al, Ga)-B MAB phase solid solutions; and then the plating layer of the periodic lamellar structure is immersed in ZnCl2 fused salt at the temperature of 450-750 DEG C for a certain time (0.5-2 h) and then taken out, and after the cross section is polished, amorphous (Al, Ga) 2O3 solid solution whiskers can be spontaneously grown on the Cr-(Al, Zn, Ga)-B MAB phase solid solution. According to the invention, a plurality of MAB phase solid solutions are prepared through a simple process, and different types of amorphous whiskers can spontaneously grow.

The invention relates to a multi-element rare earth oxide composite catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and a ternary composite material loaded on the carrier, the mass ratio of the carrier to the ternary composite material is (4: 6)-(7: 3); wherein the carrier is gamma-Al2O3 (aluminum oxide); the ternary composite material is composed of a La2O3 phase and an Nd-O solid solution phase, the proportion of the La2O3 phase is 20%-40%, and the proportion of the Nd-O solid solution phase is 60%-80%. The Nd element in the Nd-O solid solution phase has two valence states of Nd < 3 + > and Nd < 4 + >, and the molar ratio of the two valence states is as follows: Nd < 3 + > accounts for 35%-70%, and Nd < 4 + > accounts for 30%-65%. According to the obtained catalyst, the oxygen storage capacity and thermal stability of the catalyst are optimized by adjusting the La / Nd ratio and Nd valence state distribution, and the catalyst meets various vehicle catalysis requirements.

The invention provides a CMAS corrosion resistant material with stable phase, the CMAS corrosion resistant material is solid solution ceramic, the molecular formula of the solid solution ceramic is (Zr1-x-yHfx) TayO2 + 0.5 y, x is greater than 0.4 and greater than 0.1, and y is greater than 0.4 and greater than 0.1. By doping the elements Hf and Ta, the high-temperature phase change of ZrO2 is inhibited, the high-temperature stability of (Zr1-x-yHfx) TayO2 + 0.5 y is enhanced, and meanwhile, the melting point and CMAS corrosion resistance of the material are improved. Meanwhile, the invention also provides a preparation method of the material.

The invention discloses a multi-rare earth activated mechanical luminescent material based on a Li (Nb, M) O3 solid solution as well as a preparation method and application thereof, and belongs to the technical field of luminescent materials. The chemical formula of the material is Li (Nb0. 7M0. 3) O3: xRe < 0.01 > Zn, wherein M is Ta or Sb, Re is Sm, Dy or Eu, and x is larger than or equal to 0.005 and smaller than 0.01. The multi-rare earth activated mechanical luminescent material is prepared from raw materials Li2CO3, Nb2O5, ZnO, M2O5 and rare earth oxide through drying, grinding, pre-sintering, secondary grinding and sieving. The material breaks through the activation limitation of single Pr < 3 + >, realizes multi-color adjustable luminescence from yellow light, orange red light to red light, is controllable in trap structure and energy band, is good in mechanical luminescence repeatability, and can recover the initial intensity after being excited by ultraviolet light. The material can be compounded with epoxy resin to form a mechanical luminescent composite material which is suitable for a stress distribution visualization device, an intelligent optical anti-counterfeiting device and a stress sensing device.

The invention discloses an in-situ generated high-entropy particle reinforced magnesium-based composite material and a preparation method thereof, the composite material comprises Mg, Y, Dy, Ho and Er elements, the atomic ratio of Mg / Y + Dy + Ho + Er is greater than 10: 1, and the atomic ratio of Y to Dy to Ho to Er is 1: 1: 1: 1. The atomic ratio of Mg / Y + Dy + Ho + Er is larger than 10: 1, the atomic ratio of Y, Dy, Ho and Er is 1: 1: 1: 1: 1, Mg24 (Y0.25 Dy0.25 Ho0.25 Er0.25) 5 high-entropy particles can be generated after rare earth atoms are subjected to solid solution, the high-entropy particles serving as reinforcements have high strength and high hardness, and the strength and hardness of the composite material can be remarkably improved; meanwhile, in-situ synthesized Mg24 (Y0. 25Dy0. 25Ho0. 25Er0. 25) 5 high-entropy particles and an Mg matrix form a coherent interface, dislocation can be extended, plastic deformation of the material is coordinated, and when the room temperature of the prepared composite material is 25 DEG C, the yield strength is 212 MPa, the tensile strength is 361 MPa, the Vickers hardness is 107 Hv, and the ductility is 10.6%; the high-entropy particle reinforced Mg-based composite material is generated in situ, so that the room-temperature strength and ductility of the alloy can be synergistically improved.

The application provides a two-dimensional Cr2C and a preparation method thereof, wherein the preparation method comprises the following steps: step S1, providing a Cr2(AlLi)C solid solution; and step S2, de-alloying AlLi in the Cr2(AlLi)C solid solution to generate the two-dimensional Cr2C. According to the preparation method of the application, the reaction reagents can be selected from water, an aqueous alkali metal halide solution, methanol or a methanol aqueous solution and the like, which are clean and environmentally friendly, and the preparation method has the characteristics of environmental protection, economy and high efficiency, and is different from the acid etching method which is seriously polluted and high in cost. In addition, by using different etching solutions, the types of functional groups of the two-dimensional Cr2C can be selected. In addition, the two-dimensional Cr2C prepared by the preparation method of the embodiment of the application has a smaller thickness, oligolayer Cr2C enes can be obtained, and two-dimensional Cr2C with an accordion shape can also be obtained.