30results about How to "Short preparation process" patented technology

The invention provides a stable multivalent metal surface doped ruthenium oxide catalyst, a preparation method thereof and application of the stable multivalent metal surface doped ruthenium oxide catalyst in a proton exchange membrane water electrolysis device, and belongs to the technical field of catalysts and preparation thereof. According to the prepared multivalent metal such as molybdenum, niobium, tungsten, tantalum and chromium doped ruthenium oxide catalyst, the active center electronic structure is effectively stabilized due to the flexible valence change of the multivalent metal in the oxygen evolution process, meanwhile, a surface layer can be constructed through surface doping, separation of the active center Ru and lattice oxygen is effectively inhibited, and the stability of the catalyst is improved. The prepared catalyst shows excellent catalytic activity and electrochemical stability in an acidic oxygen evolution reaction, has the advantages of low cost and good catalytic stability, and in addition, can stably operate under relatively high current density as a proton exchange membrane electrolyzed water anode catalyst.

The invention discloses a lithium adsorbent and a preparation method and application thereof. According to the preparation method of the lithium adsorbent provided by the invention, Al < 3 + > and Mg < 2 + > are subjected to complexing and coprecipitation in the presence of a complexing agent to obtain the magnesium-doped aluminum adsorbent. According to the preparation method of the lithium adsorbent provided by the invention, Al < 3 + > and Mg < 2 + > are co-precipitated under the action of the complexing agent by adding the complexing agent, the magnesium element is uniformly distributed in the adsorbent, the prepared magnesium-doped aluminum lithium adsorbent can improve the tolerance of the magnesium-doped aluminum lithium adsorbent to high-sulfate salt lake brine, chemical components in the magnesium-doped aluminum lithium adsorbent product are uniformly distributed, and the stability of the magnesium-doped aluminum lithium adsorbent product is improved. And the cost is lower.

The invention provides a high-durability super-amphiphobic aircraft anti-icing coating and a preparation method thereof.The preparation method comprises the steps that silicon dioxide nanoparticles are loaded on the surfaces of micron attapulgite particles in situ to prepare core-shell structure micro-nano composite particles, and low-surface-energy fluorosilane is added for modification; meanwhile, fluorinated modification is conducted on a waterborne polyurethane adhesive through fluorosilane, the modified micro-nano particles are introduced into the modified polyurethane adhesive, then the surface of semi-cured airplane paint is evenly sprayed with the modified polyurethane adhesive, and the super-amphiphobic anti-icing coating is prepared through curing. The super-double hydrophobic surface prepared by the method shows excellent repellency to liquids (water, rapeseed oil, lubricating oil and hexadecane) with different surface tensions, can delay icing of liquid drops on the surface of a coating for 440 seconds at-15 DEG C, and has excellent comprehensive protection performance of wear resistance, airflow impact resistance, oil stain resistance and acid and alkali corrosion resistance; good super-amphiphobic performance can be kept after mechanical wear and chemical corrosion.

The present invention relates to the technical field of steel production. The present invention provides a 600MPa-level coating-free anti-oxidation hot-formed steel and a preparation method thereof, comprising: C 0.035%-0.058%, Mn 0.5%-0.8%, Si 0.3%-1.0%, Al 0.1%-0.8%, Ti 0.012%-0.024%, Cr 2.0%-3.2%, (La+Ce) 0.005%-0.05%, N 0.0020%-0.0081%, and the rest is Fe. The 600MPa-level coating-free anti-oxidation hot-formed steel provided in the present application can be used to prepare energy-absorbing safety parts with ultra-high toughness by adding elements and adjusting the content, so as to match with 1500MPa-level and above high-strength coating-free anti-oxidation hot-formed steel; and has good oxidation resistance and extremely high bending toughness.

The invention relates to a fluorosilicone rubber bis (2, 5-dimethyl-2, 5-bis-(tert-butylperoxy) hexane and a preparation method and application thereof, 2, 5-dimethyl-2, 5-bis-(tert-butylperoxy) hexane takes hydrophobic white carbon black as an absorption medium, and then is combined with polymethylvinylsiloxane with high vinyl content to improve the compatibility with fluorosilicone rubber, so that the fluorosilicone rubber bis (2, 5-dimethyl-2, 5-bis-(tert-butylperoxy) hexane is prepared. The performance of the fluorosilicone rubber is maintained; and the operation difficulty and the safety risk of a vulcanizing link of the fluorosilicone rubber are remarkably reduced. The raw materials in the production formula are easy to obtain, the production process is simple, the product quality is easy to control, the prepared vulcanizing agent product is applied to the fluorosilicone rubber industry, the labor efficiency is remarkably improved, the effect of improving the oil resistance of a vulcanized product is remarkable, and the fluorosilicone rubber product has a very good application prospect in the fluorosilicone rubber product industry.

The invention provides a plug-in hole step pattern circuit board and a manufacturing method thereof, and the method comprises the steps: setting at least one circuit pattern on at least one side of a dielectric layer, and obtaining a first inner layer part; arranging a separation layer on the at least one circuit pattern to obtain a second inner layer component; arranging a bonding layer on at least one side of the second inner-layer component, and pressing the second inner-layer component with the first inner-layer component to obtain a circuit board intermediate product; a plurality of via holes are formed in the circuit board intermediate product to obtain a circuit board; wherein the via hole is arranged on the circuit pattern; and stripping the part provided with the separation layer from the circuit board to form the plug-in hole stepped pattern circuit board with the exposed part. According to the manufacturing method, the manufacturing process is short, the manufacturing time is saved, the plug-in hole step pattern without copper on the groove wall can be realized, and the performance and the reliability of the circuit board are improved.

The application relates to the field of catalysts, and discloses a hydroisomerization catalyst, a preparation method thereof and a hydroisomerization treatment method for hydrocarbon oil, which comprises the following steps: (1) performing molding on a ZSM-48 molecular sieve precursor to obtain a carrier precursor; wherein the water content of the ZSM-48 molecular sieve precursor is not less than 15 wt% based on the mass of the ZSM-48 molecular sieve precursor; (2) performing ammonium exchange on the carrier precursor to obtain a catalyst carrier; (3) introducing an active metal component onto the catalyst carrier to obtain a hydroisomerization catalyst; wherein the active metal component is Pt and / or Pd. The hydroisomerization catalyst obtained by the above preparation method has a lower product condensation point and a higher yield in the hydroisomerization reaction of hydrocarbon oil than the product obtained by the prior art, and has a remarkable effect.

The utility model relates to efficient preparation equipment for pure iron and particle reinforced composite materials thereof, which comprises a pure iron pay-off reel, a pay-off reel guide wheel, a high-frequency electromagnetic induction heater, a former, a take-up guide wheel, a take-up reel, a motor, a main shaft and a nano-particle feeding tank, and the pure iron pay-off reel, the pay-off reel guide wheel and the high-frequency electromagnetic induction heater are arranged above the former. The forming device comprises a shell, a rolling wheel, a lower sealing cover and an extrusion die, the shell is a cylinder with the lower end open, a plurality of iron wire inlets are formed in the periphery of the upper end of the shell, a feeding port is formed in the center of the upper end of the shell, a nano-particle feeding tank is installed on the feeding port, a motor is installed at the upper end of a main shaft, the lower end of the main shaft enters the shell to be connected with the rolling wheel, and the motor drives the rolling wheel to rotate. An upward protruding disc is arranged at the upper end of the rolling wheel, outward protruding embossing or threads are arranged on the wall of the cylinder, a lower sealing cover is installed in the shell below the rolling wheel and is in an inverted cone shape, the periphery of the lower sealing cover is fixed to the inner wall of the shell, and an extrusion die is installed close to the periphery of the lower sealing cover.

This invention provides an ion-doped calcium oxalate thermochemical heat storage material and its preparation method, the chemical formula of which is Ca. 1‑ x M x C2O4·H2O, where M is a dopant ion and x is the mole fraction of the dopant ion; M includes Mg 2+ Co 2+ Zn 2+ 、Sr 2+ One or more of the following. This invention regulates the lattice parameters, local coordination environment, defect state, and microstructure of calcium oxalate by doping with ions. While maintaining the original reversibility and cycle stability of the calcium oxalate system, it further optimizes its dehydration thermal storage temperature range, thermal response boundary, structural evolution behavior, and application compatibility materials, thereby improving the thermochemical thermal storage performance of calcium oxalate from the internal structural level.

The present invention provides a catalyst for producing hydrogen by electrolysis of water, and a preparation method and application thereof, wherein the catalyst comprises a carbon nanofiber carrier and a NiXY alloy supported on the carbon nanofiber carrier, wherein X is one of Fe and Co, and Y is one of Pt, Ir, and Ru; and the molar ratio of Ni, X, and Y is 2-4:1:0.1-0.3. The catalyst provided by the present invention has a high catalytic rate and stability, can significantly improve the reaction rate of producing hydrogen by electrolysis of water, and reduce the reaction cost.

This invention belongs to the field of lithium-ion battery technology, specifically relating to a method for predicting and evaluating the lifespan of long-life lithium-ion batteries. Take 3n lithium-ion batteries manufactured under the same conditions and test their initial capacity, internal resistance, voltage, and electrochemical impedance spectroscopy (EIS) at 25°C. Cycle the lithium-ion batteries under temperature conditions T1 / T2 / T3 / ·· / Tn, and test their EIS impedance, capacity, and internal resistance after 100, 500, 1000, and 2000 cycles until the battery reaches 80% of its initial capacity. Take 3n batteries and leave them under temperature conditions T1 / T2 / T3 / ·· / Tn only, where n is greater than 3, for 0h, 500h, 1000h, 1500h, and 2000h. During this period, measure the battery's DC internal resistance (DCR), capacity, and internal resistance (ACR). Add a logic formula for data learning calculation to fit the data. Based on the usage conditions, confirm the degree of capacity decay and impedance to determine the lifespan termination point. The default battery lifespan termination is required when the capacity decays to 70% of the nominal capacity. The method of this invention provides a lithium-ion battery life prediction method. This method has the advantages of low cost, simple equipment requirements, and short preparation steps, and has the ability to accurately evaluate the life of long-life lithium-ion batteries.

This invention discloses a magnesium-based composite material containing in-situ self-generated core-shell structured particles and its preparation method, belonging to the field of magnesium-based composite materials. This magnesium-based composite material contains core-shell structured particles generated by an in-situ self-oxidation-reduction reaction of magnesium-rare earth alloy powder and precursor nano-oxide particles; the volume percentage of the core-shell structured particles is 10%~25%; the size of the metal particles in the core is 20nm~100nm, and the thickness of the core is 20nm~200nm; the size of the ceramic particles in the shell is 20nm~30nm, and the thickness of the shell is 20nm~50nm; the precursor nano-oxide particles account for 1wt%~5wt% of the total mass of the magnesium-rare earth alloy powder and the precursor nano-oxide particles. This magnesium-based composite material exhibits good interfacial bonding, high high-temperature strength and plasticity, effectively inhibits crack propagation, and improves the deformation storage energy of the composite material. Its preparation method is simple to operate, has a short process, and low cost.

The present application provides a manganese sulfide-molybdenum disulfide heterojunction lithium-sulfur battery positive electrode host material, with molybdenum disulfide nanosheets as the main body, and manganese sulfide nanoparticles are anchored on the molybdenum disulfide nanosheets to form a composite material with a manganese sulfide-molybdenum disulfide heterostructure. The present invention adds manganese disulfide tetrahydrate, anhydrous sodium molybdate and thioacetamide into ultrapure water, stirs at room temperature, and reacts by hydrothermal method to obtain a manganese sulfide-molybdenum disulfide heterojunction composite material. The preparation process of the present invention is short and the process is simple, and the experimental repeatability is good. The prepared manganese sulfide-molybdenum disulfide heterojunction composite material has high electronic conductivity, high catalytic activity for polysulfur intermediate species, and strong chemical adsorption for polysulfides, which effectively alleviates the shuttle effect and improves the kinetics of the electrode reaction process.

The invention discloses a low-cost as-cast high-toughness Ti-Al-Mo-Fe-Zr series titanium alloy and a preparation method thereof, and relates to a Ti-Al-Mo-Fe-Zr series titanium alloy and a preparation method thereof. The invention aims to solve the problem that the cost cannot be reduced while the good mechanical property of the existing titanium alloy is maintained. The alloy has the chemical general formula of Ti (87.2-x) Mo (6.8) Fe (4.5) Al (1.5) Zr (x) in percentage by mass, and x is more than or equal to 0.5 and less than or equal to 4. The preparation method comprises the following steps: 1, weighing raw materials; secondly, the Mo powder and the Zr powder are wrapped with aluminum foil, and wrapped powder is obtained; the Fe blocks and the Al blocks are cleaned and dried, and cleaned block materials are obtained; the titanium sponge, the wrapped powder and the cleaned blocks are placed in a copper crucible in a non-self-consumption vacuum arc furnace; and 3, smelting, and solidifying under the assistance of ultrasonic vibration. The invention is used for the low-cost as-cast high-toughness Ti-Al-Mo-Fe-Zr series titanium alloy and the preparation method thereof.

The present application relates to the field of composite fibers, in particular to a reactive thermoplastic sizing agent and a preparation method thereof. The sizing agent comprises: a reactive polyaryletherketone, the reactive polyaryletherketone has the structure shown in the following formula: wherein x+y=1, 0.5≤x≤1, the Ar is selected from one or more of phenolphthalein, bisphenol fluorene, hexafluorobisphenol derived divalent aromatic groups. The preparation method of the sizing agent is: synthesis of fluorine atom terminated polyaryletherketone prepolymer, preparation of mercapto terminated reactive polyaryletherketone, preparation of reactive thermoplastic sizing agent. The carbon fiber treated by the sizing agent has excellent heat resistance, the 5% decomposition temperature reaches 440 DEG C; the interface bonding between the polyaryletherketone matrix and the carbon fiber is significantly improved.

The invention relates to the technical field of sodium ion battery positive electrode materials, in particular to a carbon-coated hydrated sodium manganese oxide material, a preparation method thereof, a positive plate and a sodium ion battery. The method comprises the following steps: mixing a manganese source and an organic carbon source, and carbonizing in an inert atmosphere at 600-1100 DEG C to obtain a first precursor; mixing the first precursor with a sodium source, calcining in an oxygen-containing atmosphere at 250-400 DEG C, and reacting to obtain a second precursor; and soaking the second precursor in water, washing and drying to obtain the carbon-coated hydrated sodium manganese oxide material. And / or mixing a manganese source, a sodium source and an organic carbon source, reacting in an inert atmosphere at 210-280 DEG C, and carbonizing to obtain a carbon-coated sodium manganese oxide precursor; and soaking the carbon-coated sodium manganese oxide precursor in water, washing and drying to obtain the carbon-coated hydrated sodium manganese oxide material. The two methods can weaken the situation that the carbon is oxidized and loses the coating effect, the structure of the sodium manganese oxide is prevented from being damaged, and the process is simple.

The application provides a long afterglow / nuclear magnetic nano probe based on APE1 amplification for miRNA-21 signal amplification, and a preparation method, the surface of the long afterglow nano particle is connected with amino modified DNA1 through an amide coupling reaction, and long afterglow nano particle-DNA1 is obtained; the surface of the magnetic nano particle is modified with amino-substituted hydroquinone (HQ-N3), then click chemistry reaction is carried out with alkyne-modified DNA2, and magnetic nano particle@HQ-N3-DNA2 is obtained; the long afterglow nano particle-DNA1 and the magnetic nano particle@HQ-N3-DNA2 are assembled through two DNA hybridizations, and the long afterglow / nuclear magnetic nano probe is obtained; the nucleotide sequence of DNA1 is CGCCAGTTGT (SEQ ID NO. 1); the nucleotide sequence of DNA2 is GCGGTCAACATCA / dSpacer / GTCTGATA. The probe can be specifically triggered by miRNA-21 in a tumor microenvironment, and signal amplification is realized through an APE1 enzyme-mediated mechanism, the high signal-to-noise ratio advantage of long afterglow imaging is combined with the deep tissue imaging capability of nuclear magnetic resonance imaging, and high-sensitivity, specificity, real-time dynamic visual monitoring of miRNA-21 is realized.

The invention relates to a preparation method of a catalytic cracking catalyst. The method comprises the following steps: carrying out contact treatment on a NaY molecular sieve and a rare earth salt solution or a mixed solution of the rare earth salt solution and an ammonium salt solution, filtering and washing to obtain preparation raw materials including the rare earth-containing NaY molecular sieve, an inorganic oxide binder and natural minerals, mixing, pulping and molding; carrying out deacidification treatment on the formed catalyst, so that the content of Cl <-> on the basis of the catalyst is reduced to be less than or equal to 1.5 wt%; and performing hydrothermal roasting treatment on the deacidified molded catalyst in an atmosphere environment in which pressure is applied externally and an aqueous solution containing an acidic substance or an alkaline substance is added externally, and removing alkali metal through ammonium exchange. According to the method, under the condition that the chlorine content in the catalyst is reduced, the damage of a large amount of released hydrochloric acid gas to a rare earth NaY molecular sieve crystal structure in the catalyst is relieved, so that the cracking performance of the catalyst is improved.

The invention discloses a K / FeS / g-C3N4 / TiO2 (at) PVDF membrane for photocatalytic oxidation, a preparation method and application, through SO2 and CO2 generated by pyrolysis of K4 [Fe (CN) 6] and K2SO3, gaps are generated in a microstructure of g-C3N4, the specific surface area is higher, adsorption of organic pollutants is enhanced, the reaction rate is increased, a FeS / g-C3N4 / TiO2 heterojunction structure is constructed, and the photocatalytic oxidation performance of the membrane is improved. And carbon defects or nitrogen defects generated by K ionization are introduced into the structure, so that stable electron channel connection and light energy absorption and conversion paths are realized, the light response efficiency is improved, the recombination rate of photo-generated electron holes is reduced, and the free radical yield is improved. The membrane material is applied to a circulating aquaculture water body treatment system, odor substances are degraded through photocatalytic oxidation, and deep purification of water is achieved.

The application discloses an intelligent response organic room-temperature phosphorescent material and a preparation method and application thereof. The method comprises the following steps: dissolving a dipyridyl phosphor, a monomer and a crosslinking agent in a supersaturated solution obtained by melting a hydrated salt to obtain a mixed solution, adding an initiator into the mixed solution, stirring, and obtaining a precursor solution; and the monomer comprises acrylamide, acrylic acid or methyl methacrylate. The preparation method has the advantages of mild conditions, short preparation process, low cost, cheap and easily available raw materials, and the prepared material has the advantages of good stimulus response, long afterglow time, long phosphorescent lifetime and the like, and the material can realize response through touching, and has a wide application prospect in the fields of afterglow imaging, information encryption and anti-counterfeiting, warning or sensing.

The invention discloses a titanium-silicon borate molecular sieve catalyst with an integral structure as well as a preparation method and application thereof, and is characterized in that titanium, silicon, boron and oxygen elements are adopted to form a sheet-shaped titanium-silicon borate-containing integral structure, and the chemical formula of the titanium-silicon borate-containing integral structure is TixBySiOz, the preparation method of the catalyst comprises the following steps: carrying out mechanical mixed twisting and extrusion molding on amorphous silicon oxide, titanium oxide and alkali metal oxide, then mixing with an aqueous solution of cyclic organic amine and a boron source, and carrying out hydrothermal crystallization and acid pickling post-treatment, the catalyst is used for preparing corresponding epoxide through continuous fixed bed olefin epoxidation reaction, and meanwhile natural separation of a reaction product and the catalyst is achieved. Compared with the prior art, the catalyst has an open pore structure, a high specific surface area and high mechanical strength, is suitable for catalyzing epoxidation reaction of different olefins and organic peroxidation reagents to prepare corresponding organic epoxides, has higher target product selectivity and yield, and shows a good application prospect of olefin liquid phase selective oxidation reaction.

The invention relates to the technical field of secondary batteries, and provides a phenol organic matter additive electrolyte for an aqueous zinc-manganese battery, which is convenient to produce, suitable in price and non-toxic, and the electrolyte is composed of a mixed aqueous solution of manganese acetate, zinc acetate, potassium chloride and a phenol organic matter, wherein the phenol organic matter additive serves as a redox medium to participate in the electrochemical reaction process of the positive electrode, dissolution of manganese dioxide in the discharging process is promoted, high positive electrode reaction reversibility is achieved, and the long cycle performance of the water-based zinc-manganese battery is improved; the invention also provides a soft package battery device structure design based on a manganese dioxide dissolution and deposition mechanism, and the energy storage application process of the aqueous zinc-manganese battery based on the manganese dioxide dissolution and deposition mechanism is promoted.

This invention discloses a method for preparing and applying a biporous temperature-regulating foam, belonging to the interdisciplinary field of functional materials and phase change energy storage. The method uses melamine foam as a matrix, fills some of the foam pores with phenolic resin, and then foams it again to form a biporous foam skeleton. Polyethylene glycol is then added under vacuum adsorption to modify the foam, resulting in a temperature-regulating foam with high enthalpy and dual encapsulation characteristics, while also possessing temperature regulation and photothermal conversion functions. This method is highly operable, uses simple equipment, has a short process, and is energy-efficient, ensuring full utilization of all component materials without waste. The resulting temperature-regulating foam generally does not leak phase change materials and can be recycled multiple times. It also possesses a large melting enthalpy and crystallization enthalpy, achieving excellent temperature regulation effects.

An air-cooling integrated device with an air humidification function is characterized in that a cabinet body is arranged in a mounting frame, an air humidification heat exchanger is arranged at the top of the mounting frame, at least one exhaust fan is arranged on an air outlet in the top of the air humidification heat exchanger, and a heat exchanger and a circulating pump are arranged in the cabinet body; a heat exchange medium output port of the heat exchanger is connected with a heat exchange medium input port of the air humidification heat exchanger through a pipeline, a heat exchange medium output port of the air humidification heat exchanger is communicated with an inlet of the circulating pump through a pipeline, and an outlet of the circulating pump is communicated with a heat exchange medium input port of the heat exchanger through a pipeline. Humidified air in the air humidification heat exchanger exchanges heat with the heat exchange medium to cool the heat exchange medium, and a target heat source in the heat exchanger exchanges heat with the cooled heat exchange medium to cool the target heat source. According to the utility model, various components such as the radiator, the air humidifier, the fan and the like are integrated, so that the integrated level is high and the size is small.

The invention discloses a preparation method of a nanowire for strengthening gas turnover and application of electrocatalytic ammonia synthesis. The problems of slow reaction kinetics, low current density, high overpotential and the like are caused by hydrogen microbubbles generated by a local hydrogen evolution reaction in a nitrate reduction synthesis ammonia process to hinder contact between active sites and electrolyte. In order to solve the problem, cation-philic sites are formed on the surfaces of the transition metal nanowires through a phosphorus embedding strategy, local cation enrichment is modulated to improve microbubble interfacial tension, local bubble turnover is enhanced, high-activity catalytic sites on the surfaces of the nanowires are formed, and the electro-catalysis nitrate reduction reaction performance is improved; the ammonia synthesis with high current density, high selectivity and long-time stability is realized. The synthesis method is simple, rapid and high in expansibility, nanowire structures for strengthening gas turnover can be formed on different transition metals by improving substrate conditions, the catalytic effect is remarkably improved, and the method can be applied to various solid-liquid two-phase electro-catalytic reactions and has a good application prospect.

The invention provides a preparation method of sodium vanadium fluorophosphate, which comprises the following steps: mixing a sodium source, a vanadium source, a phosphorus source and a fluorine source to form a first raw material, the molar ratio of the sodium element to the vanadium element to the phosphorus element to the fluorine element in the first raw material is a: b: c: d, a, b, c and d are real numbers greater than 0, and a, b, c and d meet the following conditions: when a / c is less than or equal to 1.5, a / b is less than 1.5, a / d is less than 1, or when a / c is greater than or equal to 1.5, c / b is less than 1, and c / d is less than 2 / 3; processing the first raw material to obtain a first precursor; and drying and calcining the first precursor to obtain the sodium vanadium fluorophosphate. According to the preparation method, the sodium vanadium fluorophosphate with few impure phases, high purity and excellent performance can be prepared, and use of the sodium vanadium fluorophosphate is facilitated. The invention further provides a preparation method and application of the carbon-coated sodium vanadium fluorophosphate.

The application discloses a preparation method of a sulfide electrolyte layer, and specifically comprises the following steps: coating a mixed slurry including a sulfide electrolyte precursor, a lithium salt, a solvent and a binder on a pole piece to obtain a pole piece with a mixed slurry coating layer; the raw material A is a sulfide electrolyte or a sulfide electrolyte precursor; and the pole piece with the mixed slurry coating layer is dried to obtain a sulfide electrolyte layer attached to the pole piece. In the application, the preparation of the sulfide electrolyte and the coating process of the sulfide electrolyte are coupled, the preparation and modification of the sulfide solid electrolyte layer are simultaneously completed by using a pole piece drying process, the electrolyte is entirely in a liquid or slurry during the process, material preparation in a glove box is not needed, the material transmission and transfer are more favorable, the difficulty and cost of completely isolating water and oxygen from the powder material are greatly reduced, the production process is short, the process flexibility is strong, and the application is more favorable for industrialization.

The invention relates to an acid-base-rich site composite hybrid structure catalyst and a preparation method and application thereof, and belongs to the technical field of polyester chemical recovery and solid catalysis. The invention provides an acid-base-rich site composite hybrid structure catalyst which comprises calcium carbonate and calcium titanate, the mass ratio of the calcium carbonate to the calcium titanate is (1-21): 9, and the catalyst is a mesoporous material with the pore diameter of 2-50 nm. The catalyst has both Lewis acid site and alkaline site and contains detectable oxygen vacancy, the mesoporous structure and the high specific surface area of the catalyst are beneficial for improving diffusion and site utilization rate of macromolecular substrates, the catalyst shows excellent alcoholysis activity to polyester materials at proper temperature, high-selectivity recovery of monomers is achieved, and the catalyst can be used for continuous reaction of a fixed bed and can be applied to industrial production. The excellent continuous use stability is realized.

This invention relates to a 1000 MPa grade low-density medium-manganese steel and its preparation method, belonging to the field of iron and steel metallurgy and metal material processing technology. The low-density medium-manganese steel is composed of the following chemical composition by mass percentage: C 0.80%~0.95%, Al 7.50%~9.30%, Mn 8.35%~12.87%, Si 0.55%~0.62%, B 0.001%~0.003%, P≤0.008%, S≤0.0012%, with the balance being Fe and unavoidable impurities. Based on Fe-Mn-Al-C series low-density medium-manganese steel, this invention optimizes the process to prepare a low-density medium-manganese steel with excellent comprehensive performance. The production cost is low, the preparation process is short, and the preparation method is simple and easy to implement. The obtained low-density medium-manganese steel not only has good elongation but also a tensile strength reaching 1000 MPa, making it suitable for the manufacture of automotive parts and further broadening its application prospects.

The invention relates to a SiC particle reinforced aluminum-based composite material and a preparation method and system thereof. The preparation system of the SiC particle reinforced aluminum matrix composite comprises a zoning temperature control smelting device, the interior of the zoning temperature control smelting device is divided into a lower zone and an upper zone in the height direction, and the lower zone and the upper zone are provided with independent temperature control units used for achieving differential temperature control of the lower zone and the upper zone; the stirring device comprises a double-layer stirring head extending into the partition temperature control smelting device, the lower section of the double-layer stirring head is arranged to be a dispersing structure for providing strong shearing force, and the upper section of the double-layer stirring head is arranged to be a reverse propelling structure for forming downward circulation; and the powder spraying device comprises a powder spraying pipe, and at least two layers of powder outlets are formed in a pipe body of the powder spraying pipe in the length direction of the pipe body and used for spraying the SiC particles into the melt from different heights. According to the preparation system, by cooperatively regulating and controlling the smelting temperature field, the stirring flow field and the particle conveying field, precise control over the microstructure of the composite material is achieved, and the material performance and the stability of the preparation process are remarkably improved.