126 results about "Ternary alloy" patented technology

The invention discloses a preparation process of a high-performance Cu-Ni-Fe alloy calculated and designed based on a first principle, and relates to the technical field of alloy material preparation. According to the process, a precise Cu-Ni-Fe ternary alloy thermodynamic database is constructed by combining a first principle with a CALPHAD method, a multivariate phase diagram is calculated based on the database to determine a component range, then optimized components of a work function, an elastic constant and a thermal expansion coefficient are calculated through the first principle, and a finished product is obtained through smelting, heat treatment and forming machining. The final alloy is composed of, by atomic percent, 30%-75% of Cu, 10%-30% of Ni and 10%-30% of Fe, the tensile strength is larger than or equal to 816.4 MPa, the total elongation at break is larger than or equal to 34.27%, the thermal expansion coefficient is smaller than 20 * 10 <-6 > / K, the excellent mechanical property and thermal stability are achieved, the problems that component design is blind and performance fluctuation is large in a traditional process are solved, and the alloy is suitable for the fields of ocean engineering, electronic packaging and the like.

The invention relates to a PEM ternary alloy catalyst for water electrolysis hydrogen production and a preparation method thereof, and belongs to the technical field of water electrolysis catalysts. 1-butyl-3-methylimidazolium tetrafluoroborate is introduced in the generation of a carrier manganese dioxide to increase the specific surface area of the carrier, fluorine doping and oxygen vacancy construction are realized on the surface of the carrier through hydrofluoric acid treatment, and then a metal precursor is dispersed through an ethylene glycol / water system; and finally, loading and alloying of the alloy nanoparticles are completed through hydrothermal reduction and heat treatment. The morphology and electronic structure of the carrier are synergistically regulated and controlled through ionic liquid and fluorine doping, the specific surface area and active sites are remarkably increased, strong interaction of metal and the carrier is achieved through ternary alloy component optimization, and the oxygen evolution reaction activity and stability of the catalyst and the precious metal utilization rate are effectively improved.

The invention discloses a high-strength and high-plasticity low-melting-point aluminum alloy brazing material and a preparation method and application thereof, and relates to the technical field of solder manufacturing. The low-melting-point aluminum alloy welding flux is prepared from the following components in percentage by weight: 10 to 14 percent of Si, 4 to 20 percent of Cu, 0.04 to 0.25 percent of Eu, 0.78 to 0.82 percent of Fe, 0.13 to 0.17 percent of Mn, 0.08 to 0.12 percent of Mg, 0.18 to 0.22 percent of Zn and the balance of aluminum and inevitable impurities. The Al-Si-Cu ternary alloy is constructed to form a low-melting-point eutectic phase, the melting point of the material is effectively reduced, meanwhile, Eu atoms are doped, the aluminum matrix is subjected to the pressure stress effect, the interplanar spacing is reduced, the grain size of the matrix aluminum phase is reduced, the elemental Si phase is refined, the eutectic Al-Si phase content is increased, and precipitation of the brittle Al2Cu phase is restrained; therefore, the aluminum alloy solder has high tensile strength and elongation after fracture under the condition that the melting point is low.

The invention discloses an environment self-adaptive composite solid lubricant. The environment self-adaptive composite solid lubricant is prepared from the following components in percentage by mass: 80 to 90 percent of Sn-Ag-Cu ternary alloy, 5 to 10 percent of Mo2TiAlC2 and 5 to 10 percent of WS2. On the basis, the invention further provides a vehicle hub bolt fastening sleeve adopting the environment self-adaptive composite solid lubricant, the sleeve comprises a sleeve body and a sleeve inner layer located on the inner wall of the sleeve, the sleeve inner layer is provided with a bionic texture flow channel, and the sleeve inner layer and the bionic texture flow channel of the sleeve inner layer are prepared through the metal 3D printing technology; the bionic texture flow channel of the inner layer of the sleeve is filled with the environment self-adaptive composite solid lubricant, the self-adaptive performance and the mechanical performance of the sleeve can be coordinated and unified, the lubricating effect is effective and reliable, loss of the lubricant in a non-working state is avoided, and the service life of the sleeve is prolonged. The problems that an existing sleeve is high in friction and abrasion and short in service life are solved.

The invention discloses a ternary alloy hydrogen production electrode which is prepared by the following steps: 1) carrying out electrochemical anodic oxidation treatment on a Ni-Cr-Fe ternary alloy foil to obtain an initial state foil; 2) carrying out carbonitriding treatment on the initial-state foil to obtain an intermediate-state foil; and 3) carrying out CV activation treatment on the intermediate-state foil to obtain the ternary alloy hydrogen production electrode. According to the preparation method, after the foil is subjected to carbon-boron co-permeation treatment and CV activation treatment, the obtained alloy foil has excellent performance in the subsequent electrocatalytic water oxidation process, and B atoms can accelerate electrochemical self-optimization to generate more high-activity Ni < 3 + > and Fe < 3 + > catalytic sites; c atoms can stabilize related active sites through metal carbon bonds, efficient and stable water electrolysis oxygen evolution catalytic performance can be achieved through the synergistic effect of the two, and the catalyst is suitable for being used and popularized in the field of catalysis.

The invention relates to a preparation method of a PtGaGe alloy-loaded oxygen-doped carbon nanotube and application of the PtGaGe alloy-loaded oxygen-doped carbon nanotube in electro-catalytic oxygen reduction.The preparation method comprises the steps that firstly, the oxygen-doped carbon nanotube is prepared through a carboxylation method, and then platinum nitrate tetraammine, gallium nitrate and ammonium hexafluorogermanate are evenly mixed; the preparation method comprises the following steps: adding a PtGaGe alloy into an aqueous solution of an oxygen-doped carbon nanotube while continuously stirring, uniformly stirring at room temperature, freeze-drying, and roasting in a tubular furnace to finally realize successful loading of the PtGaGe alloy, thereby obtaining PtGaGe / OCNTs. As a novel preparation method, the trimetal alloy can be successfully prepared under the low-temperature condition, and the preparation method has the advantages of being simple in preparation process, mild in reaction condition, controllable in alloy variety and content and the like. According to the invention, the unique double p-d orbital hybridization characteristic in the ternary PtGaGe alloy is utilized, the electron structure of platinum is cooperatively regulated and controlled, the atom utilization rate and the catalytic efficiency of the ternary PtGaGe alloy are simultaneously improved, and the tradeoff relationship between activity and selectivity is successfully broken through.

The application discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, and the preparation method comprises the following steps: firstly, a nickel source, a molybdenum source and an aluminum source are smelted and crushed to obtain a Ni-Mo-Al ternary alloy powder; then, the Ni-Mo-Al ternary alloy powder is added into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to perform a dealuminization reaction; hydrogen bubbles generated in-situ by the reaction are used as soft templates, and the hydrophobic conductive micro powder is adsorbed on the bubble interface and assembled in the skeleton through Pickering effect; finally, the catalyst is obtained through washing and drying; the catalyst prepared by the application has a large pore structure with conductive micro powder distributed on the inner wall; the unique structure not only reduces the mass transfer resistance, constructs an electron transmission channel, but also promotes the discharge of product nitrogen through a local hydrophobic environment, and significantly improves the catalytic activity and nitrogen selectivity when treating nitrate-containing wastewater.

The present application relates to the technical field of environmental catalytic materials, and particularly relates to a noble metal doped copper-based catalyst and a preparation method thereof.The composition of the catalyst comprises, in percentage by mass, CuO: 11-14%, Pd: 0.3-0.4%, Pt: 0.05-0.1%, MnO2: 11.2-13.2%, Fe2O3: 2-4%, CeO2: 4.7-7%, ZrO2: 3.3-5%, La2O3: 1.5-3%, BaO: 0.8-1.5%, SiO2: 2-4%, and gamma-Al2O3: the balance.The catalyst of the present application successfully constructs high-dispersed Pd-Pt-Cu ternary alloy active centers and super-oleophobic surfaces through precise cooperation of multiple components, and has excellent low-temperature catalytic activity, long-term stability and excellent resistance to oil poisoning, and is particularly suitable for efficient purification of complex oil-containing waste gas such as kitchen fume.

To provide a protector for a direct-current high-voltage current that can be used stably for a long time by immediately attenuating sparks generated between contacts and suppressing ignition and flame propagation even when handling direct-current high voltage of 500 V or higher.SOLUTION: A device includes a fixed contact 11 and a movable contact 21, the movable contact approaching and separating from the fixed contact 11 in accordance with the inversion operation of a bimetal 31 made of a reversing bimetal. A magnet 40 is arranged at side parts of the fixed contact 11 and the movable contact 21. A contact-opening distance between the two contacts is 1.5-2 mm, and the magnet 40 is arranged continuously over the entire vertical range corresponding to the contact-opening distance. The magnet 40 is a ferrite magnet having heat resistance of 300°C or higher, and the structure is configured so that one inversion operation of the reversing bimetal generates the contact-opening distance. At least the surfaces of the fixed contact 11 and the movable contact 21 are formed of a binary alloy or a ternary alloy.SELECTED DRAWING: Figure 1

The invention discloses a bismuth-antimony-tin alloy negative electrode material of a potassium ion battery and a preparation method of the bismuth-antimony-tin alloy negative electrode material, and belongs to the technical field of new energy. The preparation method comprises the following steps: firstly, obtaining bismuth-antimony-tin alloy precursor powder by adopting an oil bath evaporation drying method, then putting the bismuth-antimony-tin alloy precursor powder into a tubular furnace, carrying out heat treatment under a protective atmosphere, and washing and drying to obtain the bismuth-antimony-tin-carbon composite material. The middle entropy property of the ternary alloy enables the structural stability of the material to be improved, three-dimensional carbon coating can relieve volume expansion of alloy particles in the circulation process, and the circulation stability of the composite material is improved.

The invention discloses a Mo-Ni bimetallic denitration catalyst and a preparation method thereof, and relates to the technical field of denitration agents, the preparation method comprises the following steps: firstly, smelting and crushing a nickel source, a molybdenum source and an aluminum source to obtain Ni-Mo-Al ternary alloy powder; then adding into a mixed alkaline leaching solution containing alkali metal hydroxide, a surfactant and hydrophobic conductive micro powder to carry out dealumination reaction; hydrogen bubbles generated in situ in a reaction are used as a soft template, and hydrophobic conductive micro powder is adsorbed on a bubble interface and assembled in a skeleton through a Pickering effect; and finally washing and drying to obtain the catalyst. The prepared catalyst has a macroporous structure with conductive micro powder distributed on the inner wall, the unique structure not only reduces mass transfer resistance and constructs an electron transport channel, but also promotes discharge of a product nitrogen through a local hydrophobic environment, and the catalytic activity and nitrogen selectivity during treatment of nitrate-containing wastewater are remarkably improved.

The application discloses a shaping die and a preparation method of a shape memory alloy spring. The die is composed of a shaping mandrel, an end anti-rotation clamping assembly and a radial auxiliary locking hoop. When the spring is prepared, the depth of the spiral limiting groove on the shaping mandrel can be customized. The Ti-rich ternary TiNiCu alloy wire is taken as an object, 20%-50% cold deformation is applied to the wire in advance to introduce high-density dislocations and refine grains, the wire is wound on a special constraint aging forming die, constraint aging treatment is carried out at a temperature of 350 DEG C-550 DEG C for 10-60 minutes, and the target spring is obtained after cooling and rotating demolding. By using the die, the shaping is simple, and stable driving characteristics can be obtained without subsequent cycle training, so that the preparation process of the TiNiCu alloy spring is simplified. Through the synergistic effect of component design, controllable cold deformation and constraint aging, the TiNiCu alloy spring prepared by the application has large driving displacement and high cycle stability, and is especially suitable for application scenarios of long service life, high load and precise driving.

The invention discloses a palladium-platinum-copper ternary alloy nano hollow frame, a preparation method thereof and application of the palladium-platinum-copper ternary alloy nano hollow frame in uric acid degradation catalysis. The preparation method comprises the following steps: synthesizing palladium nano solid cubic particles; depositing platinum atoms on the surface of the palladium-platinum nano cubic particle to form a palladium-platinum nano cubic particle with a core-shell structure; selectively etching a palladium core through an aqueous solution system of ferric chloride, potassium bromide and hydrochloric acid to obtain a palladium-platinum nano hollow frame; the palladium-platinum-copper ternary alloy nano hollow frame is obtained through co-deposition of platinum atoms and copper atoms in different proportions on the palladium-platinum nano hollow frame. The palladium-platinum-copper ternary alloy nano hollow frame material with different element proportions and a complex fine structure is prepared through adjustable and controllable simple preparation steps, and the palladium-platinum-copper ternary alloy nano hollow frame material has an appropriate size and high uric acid degradation catalysis activity and becomes a nano functional mimic enzyme material capable of being applied to biological uric acid degradation.

The invention relates to a carbon-loaded platinum-based ternary alloy catalyst and preparation and application thereof, the preparation method of the catalyst comprises the following steps: S1, dispersing a carbon carrier, a platinum-containing compound solution and a soluble metal salt solution of cobalt and nickel into ethylene glycol to obtain a ternary precursor suspension; and S2, adding a precipitator into the ternary precursor suspension, stirring, reacting in a microwave reactor, separating a product, washing and drying to obtain the carbon-loaded platinum-based ternary alloy catalyst. The preparation method has the characteristics of rapidness, simplicity and convenience, and is convenient for batch production; meanwhile, under the microwave reaction condition, Ni is used for promoting the activity of the Pt catalyst, Co and Ni are used for cooperatively regulating and controlling the particle size and dispersity of the catalyst, and the efficient synergistic effect of ternary metal under the microwave effect is achieved. The prepared PtCoNi ternary alloy catalyst is lower in noble metal content, moderate in particle size, uniform in dispersion, high in catalytic activity, good in stability and suitable for oxygen reduction reaction of fuel cells.

The invention relates to a biodegradable Zn alloy and a preparation method thereof. The preparation method comprises the following steps that (1) a Zn-Cu-Sr ternary alloy melt is prepared, the mass ratio of Cu ranges from 0.5 wt% to 2.5 wt%, and the mass ratio of Sr is smaller than or equal to 0.5 wt%; and 2) pouring the ternary alloy melt at the set temperature in the step 1) onto a base plate, and feeding the base plate into a casting and rolling machine for casting and rolling to obtain the target biodegradable Zn alloy. The biomedical degradable Zn-Cu-Sr ternary alloy is prepared by adopting a liquid casting and rolling technology, alpha-Zn and a second phase CuZn4 and SrZn13 can be remarkably refined by adopting the liquid casting and rolling technology, meanwhile, the mechanical property is remarkably improved, and the mechanical property requirement of a degradable implant can be met through one-time forming. Compared with a traditional method that rolling or extruding is conducted after casting, the technology is simple, the advantages of the casting technology and the rolling technology are integrated, the beneficial effects of being comprehensive, efficient, energy-saving, short in process, low in production cost and capable of achieving near-net-shape forming are achieved, and later-period tedious technologies are reduced.

The invention relates to the technical field of material surface treatment, and discloses a metal surface composite coating process and a metal surface composite coating part. According to the metal surface composite coating process, the metal surface is subjected to the steps of pretreatment, nickel pre-plating, copper plating, ternary alloy plating, silver pre-plating, silver plating, nickel plating, nickel plating again, mask positioning, pretreatment again, local gold plating, post-treatment and the like, the appearance of a prepared metal surface composite coating part is qualified, the total coating thickness is 9.3-12 m, and the thickness of the metal surface composite coating is 0.5-1.5 mm. And the thickness of the eighth gold plating layer is 0.76-1.1 m, the binding force of the metal surface composite coating component reaches the 0-level or 1-level level, and after a corrosion resistance test, the surface is not corroded, so that the requirements of good binding force on the metal surface composite coating component, relatively high corrosion resistance in an extreme environment and the like in the application fields of electronics, aerospace and the like are met.

The application relates to the technical field of heat exchange equipment, in particular to a memory alloy frost suppression piece, a preparation method thereof and a finned tube heat exchanger applying the same. The memory alloy frost suppression piece adopts a Ti-Ni-Sn ternary alloy material, and the atomic percentage components are as follows: Ti is 51at.%-53at.%, Ni is 42at.%-46at.% and Sn is 3at.%-5at.%. The finned tube heat exchanger comprises a heat exchange tube group and a frost suppression assembly comprising the memory alloy frost suppression piece; a plurality of heat exchange fins of the heat exchange tube group are sleeved on the outer periphery of a heat exchange coil in the axial direction of the heat exchange coil, and heat exchange gaps are formed between adjacent heat exchange fins; the memory alloy frost suppression piece is spirally wound around the finned tube heat exchanger in the axial direction of the heat exchange coil, the memory alloy frost suppression piece is arranged in the heat exchange gap of the heat exchange coil and has a ventilation gap between adjacent heat exchange fins. The memory alloy frost suppression piece can cover the heat exchange area through phase change deformation and vibration, thereby realizing frost suppression. Through the application of the memory alloy frost suppression piece, the finned tube heat exchanger has an energy-saving effect.

The application relates to a preparation method of a ternary alloy nanoflower and an organic hybrid composite film thereof, and belongs to the technical field of nanometer materials and functional films. BiCl3, SbCl3 and TeO2 are dissolved in ethylene glycol, NaOH and PVP K30 are added, stirring is carried out at room temperature until a clear solution is obtained, the solution is transferred to a reaction kettle, and reaction is carried out in a blast drying oven; after cooling, centrifugal washing is carried out; after drying, a Bi-Sb-Te alloy nanoflower is obtained; the Bi-Sb-Te alloy nanoflower is mixed with a PEDOT:PSS aqueous solution; a conductive enhancer is added, ultrasonic dispersion is carried out to form a uniform slurry; the slurry is deposited on the surface of a glass substrate by using a drying machine through a flow casting method; after annealing, the film is peeled off, vacuum drying is carried out, and a flexible thermoelectric composite film is formed. Through the establishment of a trinity technology of "nanoflower morphology design-in-situ interface optimization-low temperature solution process", the problems of poor flexibility of traditional thermoelectric materials, nanocomposite interface failure and unsustainable high-temperature process are solved.

The application discloses a preparation process of a high-performance Cu-Ni-Fe alloy based on first-principle calculation design, and relates to the technical field of alloy material preparation. The process constructs a precise Cu-Ni-Fe ternary alloy thermodynamic database by combining a first principle with a CALPHAD method, determines a composition range based on database calculation of a multivariate phase diagram, optimizes the composition by calculating a work function, an elastic constant and a thermal expansion coefficient through a first principle, and obtains a finished product through smelting, heat treatment and forming processing. The final alloy has an atomic percentage composition of Cu 30%-75%, Ni 10%-30% and Fe 10%-30%, a tensile strength of greater than or equal to 816.4 MPa, a total elongation at break of greater than or equal to 34.27%, and a thermal expansion coefficient of less than 20*10 ‑6 / K, and has excellent mechanical properties and thermal stability, thereby solving the problems of blind composition design and large performance fluctuation of a traditional process and being suitable for multiple fields such as ocean engineering and electronic packaging.

The invention relates to the technical field of soldering tin materials, in particular to soldering tin alloy, soldering paste, a preparation method of the soldering paste, soldering flux and a soldering structural part, and aims to solve the problems that low-temperature soldering materials are poor in soldering firmness, fragile in soldering spots, poor in soldering performance compared with high-temperature soldering materials, poor in reliability and the like in the prior art. The soldering tin alloy is a ternary alloy material of In, Sn and Bi, and in the ternary alloy material, the mass ratio of In is 40%-60%, the mass ratio of Sn is 20%-40%, and the balance is Bi.

The invention discloses an ultrathin lithium alloy strip for flight power, a preparation method of the ultrathin lithium alloy strip and a lithium metal battery. Li: (Mg + Ag) = (0.3-0.5): (0.7-0.5), and the mass ratio of Mg to Ag is (1: 1)-(1: 2.5). A main body in the alloy belt is a uniformly mixed LiMgAg ternary solid solution alloy phase without a pure lithium phase. Through alloy component design, the machining performance is remarkably improved, the viscosity of the alloy to the roller is reduced, in the preparation process, the roller sticking problem in the machining process is avoided, a release film is abandoned, the machining cost is reduced, and batch stable preparation can be achieved. And a novel alloy system and an adaptive rolling process realize collaborative optimization of solid solution, high strength and ultra thinness. The lithium is uniformly dissolved out and deposited through ternary alloy solid solution, and a three-dimensional porous skeleton structure is formed after the lithium is completely dissolved out, so that the structural integrity of the pole piece is kept, and the damage and pulverization of the pole piece in the battery circulation process are avoided. And when the copper foil with the same thickness is replaced, the alloy mass is only 10% of that of the copper foil with the same thickness, and the cycle performance of the prepared battery is greatly improved.

This invention relates to the field of electrochemical catalytic materials technology, and discloses a high-performance electrode catalytic material and its preparation method. The material has a hierarchical porous core-shell structure, composed of a Cu-Ni-Co ternary alloy core, an N-S-P co-doped carbon transition layer, and an Fe-Mn dual-doped oxide shell in a specific ratio. The preparation employs a stepwise hydrothermal-calcination method, which is mild, environmentally friendly, and easily scalable. This material is adaptable to acidic and alkaline electrolysis environments and exhibits excellent HER, OER, and [other properties not specified in the original text]. CO2 Reduction catalytic activity, C2+ With a Faraday efficiency of ≥85.3% and an activity decay of ≤4.2% after 1000 hours of continuous catalysis, it is low in cost, highly stable, and suitable for various scenarios such as water electrolysis for hydrogen production and fuel cells, showing great potential for industrial application.

The invention relates to an ultra-fine grain zinc-manganese-iron ternary alloy negative electrode material for a carbon battery, which is characterized by comprising the following components in percentage by weight: 0.15% < Fe < 3%, 0.3% < Mn < 1%, and the balance of Zn and inevitable impurities. And the grain size of the negative electrode material is submicron. The invention also discloses a preparation method of the negative electrode material. The obtained ternary alloy has the advantages of high corrosion resistance and excellent mechanical strength.

Quantum dots, photovoltaic devices incorporating quantum dots, and methods of manufacturing the same are described herein.

The invention relates to the technical field of batteries, in particular to a negative electrode material, a preparation method thereof and a secondary battery. The invention provides a negative electrode material, the negative electrode material is a silicon-based alloy, and the silicon-based alloy comprises silicon, magnesium and indium; in the silicon-based alloy, the mass ratio of the magnesium to the indium is (0.5 to 1.5): (0.5 to 1.5); in the silicon-based alloy, the mass ratio of the magnesium is 8%-25%; the mass ratio of the indium is 8%-25%. According to the negative electrode material, the preparation method thereof and the secondary battery, magnesium and indium are introduced for a silicon-based negative electrode to prepare a ternary alloy, the electronic conductivity can be improved and the silicon expansion rate can be reduced while magnesium and indium metal elements are introduced, and the magnesium and indium metal with high conductivity not only improves the rate capability of the battery, but also enhances the cycling stability of the battery.

This invention belongs to the field of metallic materials, specifically relating to a welded steel plate with an aluminum-silicon coating and its preparation method. Based on a chromium-nickel-manganese ternary alloying approach, this invention eliminates the need for pre-welding coating removal or reducing the total amount of aluminum-silicon coating entering the weld seam through beveling. High-performance aluminum-silicon coated hot-formed steel welded joints can be obtained using conventional laser filler wire welding. Currently available welding wires are mainly composed of austenitic stabilizing elements, while this invention innovatively designs the welding wire composition system. The welding wire is designed using a composite of non-austenitic stabilizing elements chromium, nickel, and manganese in a specific ratio, and the chromium-nickel equivalent ratio of the welding wire is controlled to achieve full martensiticization of the weld microstructure. The purpose of this invention is to obtain welded joints reaching the level of the base material in a low-cost and high-efficiency manner, which is of great significance to the development of laser welding technology for aluminum-silicon coated steel.

This application provides a positive electrode active material, which includes a matrix material and a coating layer located on the surface of the matrix material, wherein the chemical formula of the matrix material is LiNi. x Co y Mn z M a M′ b O2, M = at least one of Zr, Y, Al, Ti, W, Sr, Ta, Sb, Nb, Na, K, Ca, or Ce, M′ = at least one of N, F, S, or Cl, 0.80 ≤ x ≤ 1.0, 0 ≤ y ≤ 0.20, 0 ≤ z ≤ 0.02, 0 ≤ a ≤ 0.02, b = 1 - x - y - z - a, wherein the coating layer is a boron-containing ternary alloy or a boron-containing ternary alloy oxide. The positive electrode active material of this application has high compaction density, improved high-temperature storage performance, and safety performance. This application also provides a method for preparing the positive electrode active material, as well as a positive electrode sheet containing the positive electrode active material, a secondary battery, a battery module, a battery pack, and an electrical device.

The application provides a method for inhibiting arc welding porosity of medium-thick plate high-magnesium aluminum alloy, mainly comprising the following steps: taking two high-magnesium aluminum alloy plates and performing beveling processing on the plates; placing the two high-magnesium aluminum alloy plates in butt joint on a workbench and fixing the plates by using a welding clamp; selecting arc welding equipment based on double-wire synergic co-molten pool, assembling two different component welding wires of Al-Mg series and Al-Si series, and adjusting the distance, inclination angle, welding voltage, welding current and wire feeding speed between the double wires; and completing the welding of the high-magnesium aluminum alloy under the protection of inert gas according to the process parameters in the previous step. The Al-Mg-Si ternary alloy system is generated in-situ in the welding molten pool through the co-molten pool of different welding wires, the strength advantage of the Al-Mg series welding wire and the excellent fluidity of the Al-Si series welding wire are considered, the good escape condition is provided for the bubbles in the molten pool while the joint strength is ensured, the porosity defects in the weld are effectively inhibited, and the strength and elongation of the welded joint are improved.

The present application relates to the technical field of nanosynthesis and fuel cell, and provides a raspberry structure Pt-Pd-Cu ternary alloy nanocatalyst, a preparation method and application thereof, and belongs to the technical field of nanomaterial synthesis and fuel cell. A raspberry structure Pt-Pd-Cu ternary alloy nanomaterial is successfully synthesized by simultaneously reducing three metal precursors of platinum, palladium and copper with ascorbic acid and adding a structure directing agent by a one-pot method. The nanomaterial surface presents a unique raspberry structure, and a large number of convex structures are distributed on the surface, which significantly improves the specific surface area and exposes a large number of catalytic active sites. By introducing an appropriate amount of palladium into platinum, the obtained nanomaterial exhibits good catalytic performance in both acidic and alkaline media. The addition of copper not only effectively reduces the amount of noble metal platinum and lowers the cost of the catalyst, but also provides a large number of active hydroxyl radicals, which promotes the rapid oxidation of the reaction intermediate COads to CO2, thereby effectively preventing the poisoning of the platinum active site.

The application discloses a liquid metal-graphene material capable of preventing leakage, and preparation raw materials comprise a NaOH solution, a sponge, graphene sheets and a liquid metal. The liquid metal is a gallium-indium-tin ternary alloy liquid metal, and the liquid metal is subjected to high-speed stirring in an air environment to generate a part of oxidized paste-shaped liquid metal, so that the surface tension is reduced, and the liquid metal can be well attached to the sponge. The material has a simple manufacturing method, and the obtained elastic high-thermal-conductivity porous material not only avoids leakage of the liquid metal, but also helps to increase the thermal conductivity of the overall material.