436 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 high-oxygen-storage zirconium solid solution material and a preparation method, and belongs to the technical field of rare earth catalytic materials, and the method comprises the following steps: precursor preparation, ultrasonic dispersion, double-gradient precipitation, ultrasonic aging, solid-liquid separation, three-section roasting and furnace cooling. Through the synergistic effect of double-gradient precipitation and ultrasonic aging, coarse grains and non-uniform particle size distribution are avoided, and the material is not prone to abnormal growth of the grains and structural collapse in long-term high-temperature service. Meanwhile, according to the gradient roasting process, through step-by-step regulation and control of crystal densification and crystal lattice reconstruction, separation of a fluorite phase and a pyrochlore phase easily occurring in traditional low-temperature single-section roasting is reduced, a stable crystal phase structure is maintained, it is ensured that the material can still keep sufficient active surface and pore channel structures under the working conditions of high temperature and thermal shock alternation, and the performance of the material is improved. The oxygen storage capacity and the long-term durability of the catalyst carrier are obviously improved.

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 heat treatment method of an iron-nickel-based high-temperature alloy, which solves the contradiction between stress relief annealing and performance maintenance through four-step temperature coordinated regulation and control: in the first step, MC type carbide is dissolved through solid solution, segregation is eliminated, and excessive growth of crystal grains is avoided; in the second step, roughening of M23C6 type carbides is inhibited through solid solution, and formation of fine and uniform carbides on grain boundaries is promoted so as to strengthen the grain boundaries; in the third step, the residual stress is reduced through stress relief annealing, and meanwhile grain boundary carbide growth and abnormal grain growth are avoided; and in the fourth step, uniform and stable precipitation of a gamma'phase is promoted through aging, the nanometer size and the high volume fraction are maintained, and coarsening is avoided. Through precise temperature connection, the residual stress is effectively reduced, grain growth, structure nonuniformity or performance degradation caused by traditional annealing are avoided, and finally the application requirement of the superhigh-temperature steam environment at the temperature of 650 DEG C or above is met on the premise that the mechanical property and the corrosion resistance are guaranteed.

The invention belongs to the field of synthesis of inorganic non-metallic materials, and particularly relates to an equimolar-ratio seven-element high-entropy oxide and a preparation process thereof. The preparation process comprises the following steps: putting seven oxide powder Al2O3, Y2O3, TiO2, ZrO2, NiO, CuO and CeO2 into a ball milling tank according to a molar ratio of 1: 1: 2: 2: 2: 2: 2: 2, adding absolute ethyl alcohol and zirconium oxide grinding balls, performing ball milling in a ball mill, and fully drying and sieving after ball milling to obtain mixed powder; carrying out tabletting treatment on the mixed powder to obtain a to-be-sintered green body; and putting the to-be-sintered green body into an alumina crucible, and putting the alumina crucible into a microwave oven for microwave sintering. According to the method, the equimolar-ratio seven-element high-entropy oxide (AlYTiZrNiCuCe) Ox with good solid solution is obtained, the crystallinity and element uniformity of the seven-element high-entropy oxide are improved, all the raw materials react completely, meanwhile, the process efficiency is high, and energy consumption is low.

The invention relates to the technical field of chemical catalysts, in particular to a cerium-based solid solution loaded iron-based oxygen vacancy enhanced low-temperature ammonia synthesis catalyst. The heterovalent ions are doped in CeO2 crystal lattices to introduce strain and defects, so that the oxygen vacancy formation energy and concentration are greatly improved. Experiments show that the oxygen vacancy concentration (delta) of the Ce0. 8Zr0. 2O2-delta carrier disclosed by the invention can reach 0.12, which is 3-5 times that of pure CeO2. Under the conditions of 250 DEG C and 5 MPa, the ammonia synthesis rate reaches 120 [mu] mol / g / h, which is more than 20 times that of a traditional molten iron catalyst; under the conditions of 350 DEG C and 10 MPa, the ammonia synthesis rate exceeds 1000 [mu] mol / g / h and is close to the level of a noble metal ruthenium-based catalyst. As the working temperature is reduced by 100-150 DEG C, the reaction heat consumption is reduced by more than 30%, and the overall energy consumption is reduced by 25-40%.

The invention relates to a component-adjustable (Hfx, Zry) C nanowire and a preparation method thereof.The preparation method comprises the steps that ZrCl4 powder and HfCl4 powder are mixed according to a set proportion to obtain mixed powder, then the mixed powder is placed in a powder sublimation area of a chemical vapor deposition furnace, and a SiC nanowire template is placed in a reaction constant-temperature area of the chemical vapor deposition furnace; the preparation method comprises the following steps: reacting a nanowire in a negative pressure environment by taking H2 as a reaction gas, Ar as a diluent gas and ZrCl4 and HfCl4 as a Zr source and an Hf source, and cooling to room temperature after the reaction is finished to obtain the (Hfx, Zry) C nanowire, the components of the obtained (Hfx, Zry) C nanowire are adjustable and controllable, and compared with a SiC nanowire, the obtained (Hfx, Zry) C nanowire is high in high-temperature stability, can still keep a three-dimensional network structure in an oxidizing atmosphere at 1700 DEG C, and is converted into the (Hfx, Zry) O2 nanowire in situ. The (Hfx, Zry) C nanowire prepared by the method is low in synthesis temperature, free of catalyst, stable in preparation process and high in repeatability. The method is wide in application range and can be popularized to preparation of refractory metal carbide single-component and multi-component solid solution nanowires.

The invention discloses a multi-component atomic level oxide solid solution integrated electrode for electrolyzed water and a preparation method thereof, and belongs to the field of metal material surface plating. The electrode is composed of a gas diffusion layer, a nano array substrate and an atomic level oxide solid solution catalyst layer. The preparation method comprises the following steps: constructing a nano array microreactor on the surface of the gas diffusion layer; the method comprises the following steps: driving an atomic hierarchy solid solution to reconstruct by utilizing an array confinement effect through combination of precursor directional spraying and a heat treatment-rapid quenching process, and constructing a three-dimensional conformal ionomer network on the surface of the atomic hierarchy solid solution; and performing gold plating treatment on the back side of the electrode. Through the synergistic effect of spatial constraint and thermodynamic regulation of the nano microreactor, the traditional electrode interface mismatch bottleneck is broken through, and while precise construction of atomic-scale active sites is realized, the mechanical stability and oxygen evolution reaction kinetics of the electrode are improved. The preparation process has the advantages of controllable flow, strong large-scale expansibility and good industrial preparation prospect.

The invention discloses a method for recovering platinum and palladium from high-cobalt nickel-containing carbonylation slag, and relates to the technical field of non-ferrous metal carbonylation metallurgy, the method comprises the following steps: S1, hydrogen reduction and activation; s2, feeding into a high-pressure carbonylation reactor; and S3, efficient carbonylation. According to the method, the carbonylation slag is subjected to hydrogen reduction activation treatment, nickel protoxide and cobalt oxide are changed into simple substance nickel, the simple substance nickel is fed into a carbonylation reactor for carbonylation under the protection of reducing gas or inert gas after activation treatment, 95% of Ni, 85% of Fe and 80% of Co are carbonylated to enter a gas phase after carbonylation, bonding of cobalt and a platinum solid solution is broken through carbonylation, and the nickel-cobalt-cobalt-cobalt-cobalt alloy is obtained. Nickel protoxide is difficult to dissolve in various strong acids and oxidizing acids, and a foundation is laid for further separation of base metals and non-metallic element sulfur from precious metals to produce high-grade platinum concentrate.

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

The invention relates to preparation and application of a metal oxide-molecular sieve composite catalyst, and belongs to the technical field of industrial catalysis. The catalytic reaction takes carbon dioxide and hydrogen as reaction raw materials, and the catalyst is formed by compounding a metal oxide and a molecular sieve. Wherein the metal oxide is a solid solution metal oxide or a spinel metal oxide composed of three or two metal elements of M1, M2 and M3, M1 is one of Zn, Ga and In, M2 is one of Ce, Sm, La and Fe, and M3 is one of Zr, Ga, Cr, Al and Ti; the framework of the molecular sieve is a silicon-aluminum-oxygen or silicon-phosphorus-aluminum-oxygen tetrahedron; the metal oxide is prepared by adopting a gas diffusion method. The metal oxide disclosed by the invention is prepared by adopting a gas diffusion method, and has a very high specific surface area (80-300 m < 2 > g <-1 >). The composite catalyst shows excellent performance in a reaction for preparing low-carbon olefins (ethylene, propylene and butylene) through carbon dioxide hydrogenation, the carbon dioxide conversion rate can reach 35% or above, the carbon monoxide selectivity is smaller than 40%, the selectivity of the low-carbon olefins in hydrocarbons can reach 82.1%, the yield of the low-carbon olefins reaches 20.3%, and the composite catalyst has high catalytic stability. Compared with a traditional catalyst, carbon dioxide and hydrogen can be efficiently adsorbed and activated, so that the conversion rate of carbon dioxide is increased, the preparation method is simple, the catalytic performance is excellent, and the catalyst has good industrial application prospects.

A transparent, chemically prestressable or chemically prestressed glass ceramic has a high transmittance, a low haze and a high crystal phase content of keatite solid solution. A method of making such a glass ceramic includes producing a silicate green glass with a melting process and subsequent hot shaping, temperature treating the silicate green glass with at least one nucleation step carried out in the temperature range of 690° C. to 850° C. for a period of 5 min to 72 h and at least one ceramization step carried out in the temperature range of 780° C. to 1100° C. for a period of 3 min to 150 h, and performing at least one ion exchange in an exchange bath at a temperature of the exchange bath between 370° C. and 500° C. for a period of between 2 hours and 50 hours.

The present invention relates to the field of magnetic material preparation and heat treatment technology, specifically a method for widening the heat treatment process window of a high magnetic permeability nanocrystalline strip. By gradient composition design and pulsed magnetic field coupling heat treatment, the initial magnetic permeability of the strip exceeds 220,000 and the heat treatment temperature range is widened to 400°C-600°C; the alloy composition is Fe73.5%, Cu1%, Nb3%, Si13.5%, B8.5%, Co0.5%, and during heat treatment, the temperature is first raised to 450°C at 15°C / min and a 0.8T pulsed magnetic field is applied to keep the temperature, and then the temperature is raised to 550°C for keeping the temperature, crystallizing to generate α-Fe(Si) nanocrystals and Co-B amorphous interface phase, with Co distributed in the form of solid solution. This method widens the heat treatment temperature range, improves the initial magnetic permeability of the strip, improves toughness to meet automated production, and reduces costs using existing equipment; the prepared strip has high magnetic permeability and good stability, is suitable for a variety of scenarios, and has good economic and social benefits.

The invention provides a metal material surface treatment method based on the synergistic effect of solid solution-aging heat treatment and laser shock. The metal material surface treatment method is used for remarkably improving the mechanical property of a metal material and the uniformity and stability of a microstructure. Different from a traditional single laser shock peening process, the heat treatment method is combined with laser shock, and the double effects of structure optimization and mechanical property enhancement are achieved. Specifically, firstly, alloy elements are subjected to sufficient solid solution in a matrix through solid solution-aging heat treatment, heat preservation is conducted at the low temperature so that a strengthening phase can be promoted to be separated out again, and the strengthening phase which is evenly and stably distributed is obtained; and then laser shock is applied to the surface of the material, deep residual compressive stress is introduced into the surface layer through high-energy pulse laser, and a nanocrystalline layer structure is formed. According to the synergistic process, the microstructure stability and uniformity of the material are effectively improved, and the mechanical property of the material is remarkably improved. The technology is suitable for the fields of aerospace, automobile lightweight structures, rail transit and the like, and has wide industrial application prospects.

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.

Naphtha reforming catalysts are described. The catalyst includes a support comprising a solid solution or a homogenous mixture of atoms in solid state having a single crystal structure comprising AI2O3, and / or 0.01 to 3 wt% of a first metal of Group 2 or Group 15 of the Periodic Table, or a combination thereof. It also includes 0.05 to 5.0 wt% Pt and 0.05 to 5.0 wt% Re; 0.01 to 2 wt% of at least one additional metal from Groups 1, 2, 3, 9, or 15 of the Periodic Table, or combinations thereof; 0.03 to 1.0 wt% S; and 0.5 to 2 wt% of a halogen. The catalyst has an average bulk density in a range of 0.25 - 1.50 g / cc and a surface area in a range of 50-300 m2 / g. Catalytic reforming processes are also described.

The invention relates to the technical field of casting powder, in particular to special casting powder for nib steel, which comprises the following raw materials: calcium oxide, silicon dioxide, aluminum oxide, boric oxide, modified magnesium oxide-zirconium oxide solid solution particles and yttrium-silicon nitrogen oxygen complex phase particles. Modified magnesium oxide-zirconium oxide solid solution particles are subjected to phenyltrimethoxysilane surface coupling treatment, so that the interfacial compatibility and dispersion stability with a casting powder matrix are greatly enhanced, the viscosity of the casting powder can be stabilized at high temperature, fluctuation can be reduced, heterogeneous nucleation points can be provided, and the casting powder can be used for preparing a high-temperature-resistant casting powder material. A slag film is promoted to form a fine and uniform crystal structure, so that the lubrication continuity is greatly improved, and casting blank friction and surface defects are reduced; the yttrium-silicon-nitrogen-oxygen complex phase particles have the characteristic of promoting crystallization of silicon nitride, the yttrium element enhances the high-temperature stability and slag corrosion resistance of the particles, the crystallization behavior of slag can be regulated and controlled more lastingly and effectively, and the strength of a lubricating film is higher and more uniform.

The invention discloses a method for rapidly measuring solid solution metal impurities and surface free metal impurities of a titanium dioxide primary product, and belongs to the technical field of titanium dioxide production. In order to realize separation and detection of internal solid solution and surface free metal impurities in a titanium dioxide primary product, the invention provides a method for rapidly measuring the solid solution and surface free metal impurities in the titanium dioxide primary product, which comprises the following steps: quantitatively detecting the metal impurities in the titanium dioxide primary product through ICP-OES or ICP-MS, and recording the total concentration as c1; after the titanium dioxide primary product with the mass marked as m1 reacts with the dilute acid aqueous solution, weighing as m2, quantitatively detecting metal impurities, and marking the internal solid solution concentration as c2; the content of internal solid solution and surface free metal impurities in the titanium dioxide primary product is obtained. According to the method, selective separation of the internal solid solution and the surface free metal impurities is realized by utilizing the dissolution difference between the titanium dioxide solid solution and free metal impurities and the acid, and accurate quantitative analysis of the solid solution and free metal impurities is realized.

The invention relates to a preparation method of a GH4141 high-temperature alloy with carbide separated out along a grain boundary. The preparation method comprises the following steps: firstly, carrying out solid solution heat treatment on a GH4141 high-temperature alloy material, heating along with a furnace at a heating rate of 8-10 DEG C / min, keeping the temperature at 1100-1140 DEG C for 30-40 minutes, and carrying out air cooling to room temperature; then the solid solution material is subjected to aging heat treatment, furnace heating is conducted, the heating rate is 8-10 DEG C / min, heat preservation is conducted for 60-70 min at the temperature of 880-920 DEG C, and air cooling is conducted to the room temperature; according to the method, precipitation and distribution of the carbides are accurately regulated and controlled through the temperature and the time, the carbides can be all precipitated and distributed along the grain boundary, the M23C6 type carbides are not precipitated along the grain boundary, the method also has an obvious effect on materials with different deformation amounts, and the process applicability is high.

The invention relates to the technical field of alumina functional material preparation, in particular to an alumina refractory material gradient sintering process based on critical temperature control, which comprises the following steps: mixing various additives such as alpha-Al2O3 powder, nano ZrO2, Yb2O3 and the like to prepare a suspension, and carrying out spray granulation and isostatic compaction; organic matters are removed through a low-temperature section, solid solution is promoted through a medium-temperature section, a strengthening phase reaction is initiated through a high-temperature section, and sintering is performed at different heating rates in a segmented manner; hCl gas is introduced into the high-temperature section, ultrasonic vibration is applied, CO2 is introduced during gradient cooling, and pressure is applied; and finally, through segmented nitriding treatment, a gradient structure from the surface layer to the interior is formed, and the material performance is improved. According to the process, a gradient structure is formed in the material through multi-stage temperature control, additive compounding, ultrasonic treatment and other treatments; the corrosion resistance, the thermal shock resistance and the mechanical property of the refractory material can be remarkably improved, the high-temperature industrial requirement is met, the application prospect is wide, and the benefit is high.

Methods and systems for splitting one or more of water and carbon dioxide are disclosed. Exemplary methods can operate under substantially isothermal conditions. The methods can include use of a material including two or more spinel phases in a solid solution. The solid solution can include oxygen, aluminum, and one or more transition metals.

The invention provides a Se anion-doped ferric phosphate pyrophosphate / carbon positive electrode active material and a preparation method and application thereof, and relates to the technical field of electrochemical energy storage device positive electrode active materials, the positive electrode active material comprises a ferric phosphate pyrophosphate base material and a carbon coating layer, in the crystal structure of the base material, part of O is partially replaced by Se, and the general formula of the base material is Na4Fe3 (PO4) 2 (P2O7-xSex), x is less than or equal to 1.0; o < 2-> is partially replaced by Se < 2-> in a crystal structure of a matrix material to construct a Se-doped solid solution, so that an electron energy band structure of the material is regulated and controlled; due to introduction of Se, the band gap of the material can be remarkably reduced, the electron conductivity can be improved, local lattice distortion can be caused, a Na < + > diffusion channel can be widened, and the ion migration capability can be improved; the material keeps a complete main phase structure, electron and ion transmission is synergistically optimized, and the rate capability is remarkably improved.

The invention belongs to the field of building materials, and particularly relates to a Cu modified low-calcium carbon sequestration cementing material and a preparation method thereof. The raw materials of the material comprise a mixture of calcium carbonate, silicon dioxide and aluminum oxide and a Cu-containing modifier, the preparation method comprises the following steps: 1, mixing a mixture containing calcium carbonate, silicon dioxide and aluminum oxide with a Cu-containing modifier to obtain a mixed raw material; and 2, adding water into the mixed raw material obtained in the step 1, mixing, pressing into a cake-shaped wet blank, drying and multi-stage calcining the cake-shaped wet blank, quickly cooling to room temperature, and grinding into powder to obtain the Cu modified low-calcium carbon sequestration cementing material. According to the material, the hardening performance of LCCB is improved by doping Cu, copper ions enter crystals in a solid solution form, the leaching risk is small, and high environmental friendliness is achieved; according to the preparation method, the calcination temperature is lower than that of traditional cement, and the energy consumption and the production cost are reduced.

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 relates to a method for reducing anisotropy of an intermetallic compound Cu6Sn5, and belongs to the technical field of lead-free welding. The method comprises the following steps: doping alloy elements such as Ag, Ni / Co or Ni / Co / Ag into Cu6Sn5, forming a ternary phase intermetallic compound under a high-temperature condition, and stabilizing a Cu6Sn5 crystal structure. The doped elements enhance the structural stability through displacement solid solution and orbital hybridization, inhibit lattice anisotropy and hardness difference, and improve the mechanical properties of the material. The prepared alloy shows that the anisotropy is obviously reduced in the aspects of Vickers hardness, lattice constant, elasticity modulus and the like through verification of a first principle and testing of multiple groups of samples. According to the method, the reliability and the service life of the welding spot structure can be improved and prolonged without a complex processing flow, and the method is suitable for interface stability enhancement and service performance optimization of the lead-free solder welding spot.

There is provided a high strength steel sheet having a yield strength of not less than 800 MPa and also having excellent workability, collision proof stress, and crack stopping property. The amount of diffusible hydrogen in steel is not more than 0.50 mass ppm. The chemical composition includes, by mass, C: 0.150 to 0.500%, Si: 0.01 to 3.00%, Mn: 1.50 to 4.00%, P: not more than 0.100%, S: not more than 0.0200%, Al: not more than 0.100%, N: not more than 0.0100%, and O: not more than 0.0100%, with a balance being Fe and inevitable impurities. The total area fraction of tempered martensite and bainite is 55 to 95%. The presence ratio A / B of a structure A to a structure B is 0.8 to 2.5, the structure A having a nanohardness of 7 GPa or more, and the structure B having a nanohardness of 6 GPa or less. The concentration of solid solution carbon in retained austenite is 0.50 to 0.90 mass%.

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.

This invention discloses a method for precipitation separation and ceramic solidification of divalent strontium and tetravalent uranium in radioactive waste liquid, relating to the field of radioactive waste liquid treatment and disposal. U in high-level radioactive waste liquid is in the form of hexavalent uranyl (UO2). 2+ U exists in the form of hydrogenation catalytic reduction, and the present invention uses hydrogenation catalytic reduction to prepare U. 4+ Sr 2+ and U 4+ ionic radius and Ln 3+ Due to the significant differences, CePO4·0.667H2O cerium phosphate, which has a stronger nuclide-containing capacity, was selected as the co-precipitation enrichment agent for Sr. 2+ and U 4+ Separation precipitant. Inexpensive raw materials such as UO2(NO3)2·6H2O, Sr(C2H3O2)2, NH4H2PO4, and Ce(NO3)3·6H2O are selected. By controlling the Sr... 2+ :U 4+ Ion ratio, reaction time, temperature, pH, and preparation of well-developed Sr crystals 2+ / U 4+ The precipitate of cerium phosphate solid solution with high solid content is avoided by using spark plasma solid-state sintering technology to prevent grain agglomeration and adhesion during high-temperature dehydration and crystal transformation of cerium phosphate. Furthermore, pressure sintering can promote further growth of nanocrystals and promote U... 4+ and Sr 2+ Homogenization within the monazite ceramic solidified body enables a one-step preparation of monazite ceramic solidified body from a lanthanite solid solution.

The invention belongs to the technical field of non-ferrous metal material preparation, and particularly relates to an AlMgSi optical reflector material and a preparation method and application thereof.The AlMgSi optical reflector material comprises, by weight, 0.4%-0.7% of Si, smaller than or equal to 0.08% of Fe, 0.15%-0.30% of Cu, 0.8%-1.1% of Mg, smaller than or equal to 0.01% of Cr, smaller than or equal to 0.001% of Ti and the balance Al and inevitable impurities; the preparation method of the AlMgSi optical reflector material comprises the following steps that soaking, extrusion forming, solid solution treatment and aging treatment are sequentially conducted on an AlMgSi alloy ingot, and the AlMgSi optical reflector material is obtained; the soaking temperature ranges from 480 DEG C to 520 DEG C, and the extrusion temperature of extrusion forming ranges from 300 DEG C to 350 DEG C; the AlMgSi optical reflector material disclosed by the invention has high hardness and low surface roughness at the same time.