139 results about "Mixed crystal" patented technology

The invention discloses a heat treatment method for optimizing a gear steel structure and refining grains, and belongs to the technical field of heat treatment process control. The method is particularly suitable for a production scene of cold forging gear parts such as three pin shafts; according to the method, a pre-normalizing or annealing heat treatment process with specific parameters is added after cold forging forming and before carburizing, so that an AlN precipitated phase in the steel forms segregation again at a grain boundary, the grain boundary is effectively pinned, and austenite grain growth is inhibited, and therefore the phenomenon of mixed crystals is avoided, the structure is refined, and the fatigue performance is improved. Experiments prove that after normalizing pretreatment at the temperature of 900 DEG C or above or annealing pretreatment at the temperature of 720 DEG C is adopted, the original cold forging mixed crystal area with the grain size of 0-4 grade can be increased to 7 grade or above, grains are uniform and compact, and the structure property is remarkably improved. The process parameters are clear, the flow is controllable, and the method is suitable for optimization and application of the batch gear steel heat treatment process.

The invention belongs to the technical field of aluminum alloys, and particularly relates to a high-toughness anti-fatigue aluminum alloy and a preparation method thereof. The alloy comprises the following components in percentage by mass: 0.6-1.4% of Mg, 0.6-1.4% of Si, 0.5-1% of Mn, 0.3-0.8% of Cu, 0.1-0.4% of Cr, 0.1-0.3% of Mo, less than or equal to 0.15% of Fe, less than or equal to 0.05% of Ti, less than or equal to 0.05% of other impurities and the balance of Al. In the alloy, the ratio of Mn to (Cr + Mo) is 2-5, and Cr + Mo is less than or equal to 0.4. The aluminum alloy is subjected to synergistic microalloying of elements Mn, Cr and Mo and three-stage homogenization treatment, then a high-density'core-shell 'structure dispersed phase is separated out, and the deformation structure regulation and control effect is effectively improved; through hot forging and multi-stage solution treatment, a mixed crystal structure in which sub-crystals and recrystallization coexist is obtained, the fatigue crack propagation rate is remarkably reduced, and the obdurability and the fatigue resistance are synchronously improved.

The invention provides a method for synthesizing high-valued amorphous calcium carbonate through carbon sequestration of carbide slag, and belongs to the technical field of carbon sequestration and high-valued utilization of industrial solid waste resources. The method comprises the following steps: carrying out active calcium extraction reaction on a dried and ball-milled carbide slag aqueous solution through ammonium chloride, stirring and filtering to obtain a calcium-containing solution; the method comprises the following steps: adding a certain amount of absolute ethyl alcohol and magnesium chloride into a calcium-containing solution, fully stirring, adjusting the pH value to a certain value, and introducing CO2 gas for mineralization reaction to obtain a turbid liquid containing calcium carbonate precipitate; and carrying out centrifugal separation, alcohol washing and drying on the turbid liquid to obtain powder calcium carbonate. According to the method disclosed by the invention, the calcium carbide slag active calcium liquid is extracted by adopting ammonium chloride, and absolute ethyl alcohol-magnesium chloride is added to precisely regulate and control the reaction steps of CO2 and the extracted calcium liquid, so that the CO2 is efficiently fixed, and meanwhile, mineralization is performed to obtain a mixed crystal type amorphous nano calcium carbonate product. According to the technology, double targets of synthesizing high-valued calcium carbonate through carbide slag carbon sequestration are achieved, and an innovative technical path is invented for current solid waste resource utilization.

The invention discloses a single crystal blade directional solidification process real-time closed-loop optimization method and casting equipment, and the method comprises the steps: S1, constructing a multi-physical field numerical simulation model to simulate a simulation temperature field in a directional solidification process; s2, arranging a temperature sensor at a key part of the actually poured single crystal blade to obtain an actually measured temperature field; s3, inputting the simulated temperature field and the actually measured temperature field into an extended Kalman filter to update model parameters of the multi-physical field numerical simulation model; s4, extracting solidification process characteristic parameters from the corrected multi-physical field numerical simulation model, inputting the solidification process characteristic parameters into a pre-trained machine learning model, and predicting a mixed crystal tendency probability; s5, optimizing process parameters of directional solidification by adopting a self-adaptive genetic algorithm by taking miscellaneous crystal tendency probability minimization as a target function; and S6, the optimized technological parameter set is issued to an execution mechanism, the directional solidification process is controlled to achieve closed-loop adjustment, and the steps S2 to S6 are executed circularly.

The invention discloses a post-forging heat treatment method for improving the structure uniformity of hot-work die steel, which comprises the following steps: (1) returning the forged hot-work die steel to a furnace, supplementing the temperature to 980-1020 DEG C, preserving the heat for 4-6 hours, discharging the hot-work die steel, alternately cooling the hot-work die steel to 150-300 DEG C by water and air, and loading the hot-work die steel into a heating furnace; (2) the temperature is increased to 650-750 DEG C along with the furnace, heat preservation is conducted for 2-4 h, and the mixture is discharged out of the furnace, air-cooled to 150-300 DEG C and loaded into a (3) the temperature is increased to 800-850 DEG C along with the furnace for preheating and heat preservation, and the heat preservation time is 2-4 Raising the temperature to 1020-1050 DEG C, and keeping the temperature for 4-6 hours; and discharging from the furnace, alternately cooling to 150-300 DEG C by water and air, loading into a heating furnace, and carrying out isothermal spheroidizing annealing. According to the method, the forging structure can be refined, the forging coarse grain and mixed crystal defects are eliminated, chain carbide precipitation of the annealing structure is inhibited, and the uniformity of the annealing structure and the transverse core impact toughness of the material can be remarkably improved.

The invention relates to a heat treatment process for EN26 shaft products, which combines the multi-step and large-section size shape of an EN26 shaft, takes the large step at the tail end as a symmetric base point before heat treatment, is designed according to the double-length size, and adopts the modes of low-temperature preheating, high-temperature normalizing, air cooling after normalizing and tempering after forging to effectively cut off the structure inheritance. The method solves the problem of mixed crystal or coarse crystal grains caused by non-equilibrium structures due to weaving inheritance, promotes pearlite with small interlamellar spacing to be converted into austenite structures through a rapid heating and repeated austenitizing mode, improves the nucleation rate so as to achieve the effect of refining the grain size, and improves the grain size through reasonable quenching cooling strength. According to the method, the structural transformation from high-temperature austenite to martensite is guaranteed, the risk of product cracking caused by overlarge thermal stress and structural stress is avoided, the overall stability of a forge piece is guaranteed through high-temperature tempering, the strength, plasticity, toughness and hardness are well matched, the overall quality and production efficiency of the EN26 shaft produced through the method are improved, and the production cost is reduced. And after finish machining, single-length sawing and delivery are carried out.

The invention relates to the field of oxygen-containing compound adsorption and removal, and discloses a molecular sieve adsorbent as well as a preparation method and application thereof. The method comprises the following steps: mixing a silicon source and an aluminum source, carrying out preliminary crystallization, aging and crystallizing in a gel-like mother solution containing the silicon source and the aluminum source to obtain an FAU molecular sieve seed crystal, and carrying out mixed crystallization on the FAU molecular sieve seed crystal, various molecular sieves and the aluminum source, forming and roasting the obtained molecular sieve mixed crystal, the sodium metaaluminate modified carbon nanotube, an aluminum source and an auxiliary component; and finally, carrying out surface modification by adopting anhydrous amino acid ionic liquid. The molecular sieve adsorbent has a hierarchical pore structure composed of abundant micropores and mesopores and a relatively high specific surface area, the adsorption performance is improved through modification of the amino acid ionic liquid and addition of the modified carbon nanotubes, and when the molecular sieve adsorbent is used for adsorbing and removing oxygen-containing compounds in olefins, the molecular sieve adsorbent shows a relatively good removal rate and a relatively long adsorption period, and the molecular sieve adsorbent has relatively good application prospects. The production cost can be effectively reduced, and the method has high production and application value.

The invention discloses a production method for improving the structure uniformity of a 304 austenitic stainless steel medium-thickness plate, belongs to the field of stainless steel production, and solves the problem that mixed crystal structures often appear in the structure of the 304 austenitic stainless steel medium-thickness plate produced by an existing method. The method comprises the following steps: producing a 304 austenitic stainless steel continuous casting sheet billet; the plate blank is heated for the first time, the temperature of a heating furnace is set to be 1280-1300 DEG C, the heating time is 300-360 min, and natural cooling is conducted; the plate blank is remelted, heated and rolled again, the heating temperature is set to be 1250-1270 DEG C, the heating time is 240-300 min, and the remelted and reheated plate blank is rolled to the target thickness; and solution treatment is conducted, the solution treatment temperature ranges from 1050 DEG C to 1080 DEG C, the solution treatment time coefficient ranges from 1.0 min / mm to 2.0 min / mm, and water cooling is conducted to the room temperature. The structure uniformity of the 304 austenitic stainless steel medium plate produced by the method is obviously superior to that of a traditional method.

The present application belongs to the technical field of steel smelting and hot working, and particularly relates to a microstructure uniformity regulation method for hot work die steel, comprising: obtaining the hot work die steel through initial smelting by an electric furnace, LF refining purification, VD refining degassing and impurity removal; the present application adopts special smelting, forging and heat treatment processes, so that the prepared product has excellent microstructure uniformity, no banded structure and no mixed crystal structure in the finished product structure, and the carbide is uniformly distributed in a dispersion state; according to the annealing structure rating, annealing structure banded segregation rating and heat treatment structure rating diagrams of the North American Die Casting Association NADCA #207-2016 standard, AS1 level, SA1 level and HS1 level can be respectively reached. The hot work die steel of the present application has excellent wear resistance and impact toughness. The die prepared from the material has a longer service life and can better adapt to the demand of modern industrial production for high-end dies.

The invention discloses a method and device for preparing a mixed crystal structure material through friction stir solid-phase deposition, and belongs to the technical field of heterostructure material preparation. According to the method, firstly, a deposition head is used for carrying out single-layer friction stir solid-phase deposition on a needed material, then a special corrugated roller is used for carrying out cold rolling to enable different positions of the surface of the deposition material to be subjected to different degrees of cold deformation, and therefore uneven high dislocation density is introduced into a deposition layer, and then next-layer friction stir solid-phase deposition is carried out on the surface of the deposition layer. In the friction-stir solid-phase deposition process, static recrystallization and static recovery rapidly occur in a local high-dislocation-density area to maintain fine grains, and grain growth rapidly occurs in a low-dislocation-density area due to heating, so that the whole deposition layer shows the mixed crystal structure characteristic that fine grains and coarse grains coexist; the block mixed crystal structure material can be prepared through stirring friction solid phase deposition and cold rolling circulation.

A kind of multi-wavelength selection laser based on Ho doped crystal and its wavelength tuning method belong to the field of optoelectronic device manufacturing and optical engineering laser technology.To solve the function of multi-wavelength output of multi-wavelength selection laser, the pump source of 1940nm is connected with fiber coupler through fiber, the fiber coupler is arranged with fiber coupling lens group, polaroid, input plane mirror, Ho doped mixed crystal, output plane mirror and 1900nm narrow band filter in sequence along the light path;The Ho doped mixed crystal is composed of first square doped crystal, second square doped crystal, third square doped crystal and fourth square doped crystal, and the combination includes Ho: LLF crystal, Ho: YAP crystal and Ho: YLF crystal cut in different axial directions.The present application can efficiently realize tunable multi-wavelength output.By combining Ho doped crystals with different substrates, a laser is used to realize multi-wavelength output in a wide wavelength range.

The invention belongs to the technical field of powder metallurgy, and particularly relates to a preparation method of a high-density molybdenum-rhenium alloy. The compactness of the molybdenum-rhenium alloy mainly refers to the number and the size of internal pores, cracks and other defects of the molybdenum-rhenium alloy. The high compactness means that the internal structure of the molybdenum-rhenium alloy is uniform and continuous, the number of defects is extremely small, the strength, plasticity, toughness, thermal conductivity, electrical conductivity, corrosion resistance, high-temperature stability and fatigue life are improved, and premature failure, leakage, corrosion and performance degradation caused by pores are avoided. According to the preparation method of the high-density molybdenum-rhenium alloy, on one hand, in the preparation process of mixed crystals of rhenium salt and molybdenum salt, the particle size and particle size distribution of the mixed crystals are controlled through technical means, and the problem that the mixed crystals are distributed unevenly is avoided; and on the other hand, formation of internal pores and cracks is eliminated through technical means in the molybdenum-rhenium alloy powder compression molding process. And finally, the high-density molybdenum-rhenium alloy is prepared.

The invention belongs to the technical field of adsorption materials for extracting lithium from salt lake brine, and provides a ternary vanadium-titanium-niobium lithium ion sieve based on a biomimetic mineralization template and a lithium extraction device and a lithium extraction process thereof aiming at the bottleneck problems of low adsorption capacity, poor magnesium-lithium selectivity, short cycle life and the like of the existing titanium-based lithium ion sieve. The lithium ion sieve material with an anatase-brookite mixed crystal structure and three-stage through pore channels is constructed by coupling vanadium and niobium elements with a multi-stage atmosphere regulation gradient calcination process method. According to the technology, the oxygen vacancy concentration, the ion diffusion kinetics and the structural stability of the material are remarkably improved. The invention provides a novel adsorbing material solution with high adsorbability, optimization and long circularity for extracting lithium from salt lake brine with high magnesium-lithium ratio, and has important application value in the fields of promoting green and efficient development of salt lake lithium resources and new energy strategic resource recovery.

The application belongs to the technical field of aluminum alloy, and particularly relates to a high-strength and high-toughness anti-fatigue aluminum alloy and a preparation method thereof. The alloy has the following components in percentage by mass: Mg: 0.6-1.4%, Si: 0.6-1.4%, Mn: 0.5-1%, Cu: 0.3-0.8%, Cr: 0.1-0.4%, Mo: 0.1-0.3%, Fe: less than or equal to 0.15%, Ti: less than or equal to 0.05%, total amount of other impurities: less than or equal to 0.05%, and the balance being Al. The ratio of Mn / (Cr+Mo) in the alloy is 2-5, and Cr+Mo is less than or equal to 0.4. The aluminum alloy is subjected to element Mn, Cr and Mo synergistic micro-alloying and three-stage homogenization treatment, so as to precipitate high-density 'core-shell' structure dispersed phase, effectively improving the deformation organization regulation effect; the aluminum alloy is subjected to hot forging and multi-stage solid solution treatment, so as to obtain mixed crystal organization coexisting with subgrain and recrystallization, significantly reducing the fatigue crack propagation rate, and synchronously improving the strength and toughness and the anti-fatigue performance.

The application discloses a kind of implant and its preparation method and application, the implant includes material body, metal oxide layer and mixed crystal layer, the mixed crystal layer is located the surface of the metal oxide layer;The metal oxide layer includes metal oxide nanorod array;The metal oxide is selected from zinc oxide, silver oxide or its combination;The mixed crystal layer includes CaP crystal and metal oxide crystal.The implant of the application is sterilized by the bacteriostatic metal ion generated by physical puncture and degradation of metal oxide nanorod, has good antibacterial effect to gram-positive bacteria and gram-negative bacteria, prevents infection;It can also relieve post-implantation inflammatory response, reduce immune response under post-implantation infection, shorten wound healing time.In addition, due to the coating effect of mixed crystal layer on metal oxide layer, the bacteriostatic metal ion is slowly released, the release time is long, and long-lasting antibacterial effect can be achieved, and post-implantation inflammatory response can be reduced.

The application relates to a high-efficiency molecular sieve adsorbent for deep purification of oxygenates and preparation and application of the adsorbent, and the preparation process comprises the following steps: 1) molecular sieve synthesis: uniformly mixing an aluminum source, a silicon source, alkali, a template agent and water to obtain a crystallization liquid, aging, then carrying out microwave hydrothermal crystallization and traditional hydrothermal crystallization to obtain EMT / 13X mixed crystal molecular sieve, and then carrying out pressure filtration to obtain a wet filter cake; 2) granulation: drying the wet filter cake, uniformly mixing inorganic additives and pore-forming agents, rolling and granulating, and then drying; and 3) calcination: placing the granulated product in an oxygen-containing atmosphere for calcination, so that the EMT / 13X composite molecular sieve adsorbent is obtained. The application breaks through the double-template method for synthesizing the EMT / 13X mixed crystal molecular sieve with an EMT molecular sieve as the main component, complete structure and high crystallinity, the specific surface area of the molecular sieve is greater than or equal to 450 m 2 / g, ethylene adsorption heat is less than or equal to 70 DEG C, the oxygenate adsorption capacity is increased by more than 30%, the purification depth can reach below 1 ppb, and the molecular sieve is suitable for efficient removal of trace nonpolar or polar oxygenates such as dimethyl ether, methanol and propyl aldehyde in low-carbon olefins.

The invention discloses a heat treatment process for improving the grain size of a TP347H seamless steel tube with an ultra-large diameter, which is suitable for improving the grain size of the TP347H seamless steel tube with the outer diameter of more than or equal to 650 mm, the wall thickness of 80-100 mm and the length of more than 6000 mm, so as to improve the quality of the TP347H seamless steel tube. Stepped solid solution, variable-speed cooling and composite stabilization processes are effectively combined, raw NbC is sufficiently dissolved in a low-temperature stage, grain boundary migration and growth are inhibited in a high-temperature stage, an anaphylaxis interval can be quickly exceeded through variable-speed cooling, sigma phase precipitation is avoided, residual stress is relieved and reduced, multi-temperature-zone stabilization treatment can promote uniform precipitation of nanoscale NbC, pinning of grain boundaries and grain refinement, and the stability of NbC is improved. According to the TP347H seamless steel pipe produced by the method, the phenomena of mixed crystals and coarse crystals are improved, the quality is improved, and the market demand is met.

This invention provides a method for producing 270MPa grade hot-dip galvanized deep-drawing steel strip. The method controls the chemical composition, the hot rolling process (including soaking temperature, final rolling temperature, and coiling temperature), and the hot-dip galvanizing process (including annealing temperature, galvanizing temperature, finishing, and tension leveling). This results in hot-dip galvanized steel strip with excellent mechanical properties (Rp0.2 = 185–255 MPa, Rm ≥ 270 MPa, A50mm ≥ 42%, n90 ≥ 0.17). It effectively overcomes the problems of mixed crystals and performance deterioration in the pickling-hot-dip galvanizing technology during annealing due to lack of deformation recovery, recrystallization, and grain growth. The product's microstructure is 100% ferrite with a ferrite grain size of 8.0–10.5. Furthermore, the pickling-direct hot-dip galvanizing process used in this invention omits the conventional cold rolling step, reducing process costs.

The invention provides high-strength gear steel and a forging method thereof, relates to the technical field of wind power gear steel, and aims to adjust the microalloy proportion of the traditional gear steel and improve the steel part casting process flow to treat the mixed crystal problem, so that the steel part better meets the wear-resistant requirement of a part for a large wind power gear. For example, elements such as Cr, V and N are introduced to reinforce a metal structure; under the technology of a traditional gear steel production process (normalizing, tempering and natural cooling), a more refined heat treatment process is carried out, so that the product quality is more reliable, and the purposes of good macrostructure and macrostructure quality, high performance strength and reliability improvement are achieved.

The invention relates to the technical field of Stefan acid purification, in particular to a method for purifying Stefan acid from a dinitrobenzene nitration byproduct mixture, which comprises the following steps: S1, dissolving the dinitrobenzene nitration byproduct mixture in water, adjusting the pH value to be alkaline, and filtering to obtain filtrate and filter residue dinitrobenzene solid; s2, adding the filtrate into an organic solvent, extracting, separating liquid, and retaining a water phase; and S3, adjusting the pH value of the water phase to be acidic, heating for acid precipitation, and then cooling for crystallization to obtain a mixed crystal of Stefan acid and picric acid. And S4, heating and mixing the mixed crystal and toluene, and filtering to obtain the high-purity Stefan acid. According to the method, efficient separation is realized through a two-step core process of'alkali dissolution-acidification 'and'selective dissolution'. In the final product, the content of dinitrobenzene can be reduced to 0%, the content of picric acid can be reduced to 1% or below, and the purity of Stefan acid can reach 99% or above.

The invention discloses a full-spectrum response type aerogel photocatalyst as well as a preparation method and application thereof. The full-spectrum response type aerogel photocatalyst has a multi-heterostructure, and the multi-heterostructure comprises an in-plane heterostructure of amorphous carbon, graphite carbon and a BCN ring and a TiO2 mixed crystal phase structure of anatase type TiO2 and rutile type TiO2. The catalyst can be applied to preparation of methanol through photo-thermal catalytic reduction of CO2 in any single wave band range or combined wave band range in ultraviolet light, visible light and near-infrared light; the preparation method of the full-spectrum response type aerogel photocatalyst comprises the following steps: a) preparation of reduced TiO2 nanoparticles; b) preparation of aerogel; and c) high-temperature carbonization. The aerogel photocatalyst not only can realize full-spectrum response, but also can realize in-situ generation and regulation of oxygen vacancies in photo-thermal catalysis, so that the efficiency of reducing CO2 to prepare methanol is improved.

The invention discloses a method for preparing a selexipag crystal form I. The method belongs to the technical field of medicines, and comprises the following preparation steps: adding a selexipag crude product into a reactor, adding a benign organic solvent, and stirring to completely dissolve the selexipag crude product to obtain a clear solution; controlling the temperature of the clarified solution to be a first temperature, dropwise adding an inert solvent into the clarified solution, carrying out gradient cooling on a reaction system after dropwise adding is completed, and carrying out heat preservation and crystallization for 1 h after the temperature of the reaction system is reduced to a second temperature; carrying out suction filtration on the crystallized reaction system, and collecting a filter cake; and putting the filter cake in a vacuum drying oven, and drying for 12-16 hours under the conditions that the temperature is 40-50 DEG C and the vacuum degree is less than or equal to-0.09 Mpa, so as to obtain the selepag crystal form I. The invention further discloses a preparation method of the selepag crystal form I. According to the invention, the specific combination of the benign solvent and the inert solvent is selected, and the temperature-controlled dropwise adding and gradient cooling processes are matched, so that the generation of mixed crystals is effectively avoided, and the product crystal form is high in purity and good in stability.

This invention relates to a processing method for improving the chloride ion corrosion resistance of GH3625 bars, belonging to the field of bar production technology in the metallurgical industry. The technical solution is as follows: the bars are placed in a heating furnace and heated to 1195~1215℃ for a holding time T1=257.39*exp(D1 / 62.52)-26.45; then cooled after removal from the furnace at a rate greater than 100℃ / s; the GH3625 bars are then drawn with a deformation of 50%; the drawn GH3625 bars are then placed in a heating furnace and heated to 825~835℃ for a holding time T2=44.78*exp(D2 / 45.57)+70.47; finally cooled after removal from the furnace at a rate less than 5℃ / min. The beneficial effects of this invention are: it can improve the corrosion resistance of the material, eliminate deteriorating phases while ensuring the necessary mechanical properties of the material, and simultaneously solve the problem of mixed crystals.

This invention discloses a method for producing MnSO4-FeSO4 mixed crystals with a controllable manganese-iron atomic ratio using reduced mineral powder. This method allows new energy material companies to control raw materials and ensure product quality stability. The technology for producing MnSO4-FeSO4 mixed crystals with a controllable manganese-iron atomic ratio is of great significance for the production of lithium manganese iron phosphate products.

The invention provides various crystal forms of an LEE011 intermediate and a preparation method thereof. Specifically, the invention provides an anhydrous crystal form of the LEE011 intermediate, namely Form A; the crystal form of the LEE011 intermediate is Form B; the crystal form of the LEE011 intermediate is Form C; the crystal form of the LEE011 intermediate is Form D; the crystal form of the LEE011 intermediate is Form E. The crystal form provided by the invention is stable in chemical property and easy to preserve, and the filtering performance is far better than that of a mixed crystal sample obtained by a current process. The preparation process is simple and feasible and is suitable for industrial production.

The application discloses a method for preparing ultra-fine grain Ti-6Al-4V titanium alloy. The method comprises the following steps: pretreating a coarse grain Ti-6Al-4V titanium alloy plate, processing the plate into a square block with a specific proportion, and performing surface smoothing treatment. Then, forging deformation is performed through multi-directional isothermal closed-die forging, the forging direction, the pressure and the deformation pass are controlled, and the mixed crystal Ti-6Al-4V titanium alloy with an ultra-fine grain structure is prepared. After the forging, the sample is subjected to surface cleaning treatment, and is prepared for rolling at a proper rolling temperature, and the thickness of the sample is reduced through rolling in multiple passes. Finally, the obtained ultra-fine grain Ti-6Al-4V titanium alloy has the following characteristics: the maximum grain size is less than 5 microns, the average grain size is less than 1 micron, and the proportion of grains with a size of 1 micron or less is more than 75%. The method effectively improves the uniformity of the material structure, prolongs the service life of the die, optimizes the process efficiency and surface quality control, and significantly improves the mechanical properties of the material, and provides a new technical approach for the preparation of titanium alloy materials.

The application provides a method for separating cis and trans 2,2,4,4-tetramethyl-1,3-cyclobutanediol, comprising the following steps: cooling a mixed solution containing a solvent, cis and trans 2,2,4,4-tetramethyl-1,3-cyclobutanediol to a first temperature at a first cooling rate, then cooling to a second temperature at a second cooling rate, and performing solid-liquid separation to obtain mixed crystals; performing screening treatment on the mixed crystals to obtain cis and trans 2,2,4,4-tetramethyl-1,3-cyclobutanediol crystals; wherein the first cooling rate is less than or equal to 10 DEG C / h, and the second cooling rate is greater than or equal to 30 DEG C / h; the first temperature is higher than the second temperature, the temperature of the mixed solution is greater than the first temperature, the first temperature is less than or equal to 70 DEG C, and the second temperature is less than or equal to 30 DEG C. The method can efficiently and simply separate cis and trans 2,2,4,4-tetramethyl-1,3-cyclobutanediol crystals.

This invention proposes a method for constructing a grain evolution model for the entire hot manufacturing process of nuclear power steel based on high-throughput characterization and data-driven approaches. By designing samples with high-throughput grain configurations and performing full-domain high-throughput microstructural characterization, massive amounts of crystallographic information on micro-region structures are obtained, providing parameterized expressions suitable for describing each grain configuration. Through cross-scale multiphysics modeling using rigid-visco-plastic finite element method and crystal plastic finite element method, the distribution law and quantitative description of deformation energy storage in each micro-region of large-size nuclear power austenitic steel under different hot deformation process conditions are investigated. A data-driven model of the relationship between hot deformation, deformation energy storage, and solid solution grain configuration in nuclear power austenitic steel is constructed, forming an active control strategy and method for controlling coarse / mixed grains in nuclear power austenitic steel. This invention can provide theoretical and methodological support for accurate quantitative prediction of grain evolution and active control of abnormal grains throughout the entire hot manufacturing process of key nuclear power components.

The invention relates to the technical field of cocatalyst preparation, and particularly provides alkylaluminoxane and a preparation method thereof. The preparation method of the alkylaluminoxane comprises the following steps: mixing metal salt containing crystal water with anhydrous alkali metal halide, grinding to form mixed crystals, and under the protection of inert atmosphere and inert solution, enabling the mixed crystals to be in contact and react with alkylaluminoxane to obtain the alkylaluminoxane. The alkylaluminoxane and the preparation method provided by the invention are used for realizing synthesis of alkylaluminoxane with high yield, high safety and high storage stability.

The invention relates to the technical field of inorganic salt purification, and discloses high-purity ammonium sulfate and a preparation process thereof.The preparation process includes the following steps that firstly, a magnetic response macrocyclic ether complexing agent is added into an ammonium sulfate solution to be purified, the complexing agent can specifically capture impurities such as potassium ions, and a stable complex with magnetic responsiveness is formed; then, selectively crystallizing and separating out the target product ammonium sulfate under a mild condition by a gas-phase anti-solvent crystallization method, and meanwhile, effectively repelling a large-volume impurity complex into a mother solution. The key step is that obtained solid-liquid mixed crystal mush is introduced into a gradient magnetic field for enhanced separation. Through creative integration of molecular recognition, phase equilibrium engineering and a magnetochemical separation technology, the limitation of a co-crystallization effect is fundamentally broken through, and ultra-high-purity ammonium sulfate with extremely low impurity content can be prepared in an efficient and environment-friendly manner.