85results about How to "Improve microstructure" patented technology

The application relates to the technical field of zirconium-niobium alloy material processing, in particular to a preparation method of a large-diameter zirconium-niobium alloy pipe for nuclear industry, which comprises the following steps: S1, mixing nuclear-grade sponge zirconium and niobium scraps, or mixing zirconium-niobium alloy, zirconium dioxide and iron; melting the mixture and preparing a zirconium-niobium alloy ingot; S2, sequentially performing large deformation forging in a beta single-phase zone and an alpha+beta two-phase zone; S3, drilling a central hole in the axial direction of a round-forging blank; quenching in the beta single-phase zone; S4, coating an anti-galling agent on the surface of the central hole and heating to prepare a pipe blank in the mode of cross piercing; S5, performing periodic forging and rolling on the pipe blank; S6, annealing the hot-rolled pipe twice; and straightening the hot-rolled pipe after the second-stage annealing. The zirconium-niobium alloy pipe has uniform microstructure, good mechanical properties and corrosion resistance, the production direction of the brittle hydride is nearly parallel to the circumferential direction of the pipe, and brittle damage of the pipe wall thickness caused by the crack propagation of the hydride is avoided.

This invention belongs to the field of permanent magnet materials technology, specifically relating to a high-lanthanum-cerium NdFeB sintered permanent magnet and its preparation method. The raw materials for preparing this high-lanthanum-cerium NdFeB sintered permanent magnet include alloy one and alloy two. The chemical formula of alloy one is [(PrNd)]. 1‑x (RL) x ] a (TM) b (HM) c B d Fe 100‑a‑b‑c‑d Given the following conditions: 0.3 ≤ x < 1, 29.5 ≤ a ≤ 32.5, 0 < b ≤ 5, 0 < c ≤ 0.8, 0.85 ≤ d ≤ 1.1, the chemical formula of the alloy component II is (PrNd). a1 Ga b1 Fe 100‑a1‑b1 70≤a1≤90, 0<b1≤20. By combining alloy one and alloy two, and combining them with appropriate sintering and aging processes, high lanthanum-cerium NdFeB sintered permanent magnets are obtained, achieving surface magnetic hardening of high lanthanum-cerium main phase grains.

This invention provides a method for improving the microstructure and corrosion uniformity of low-temperature extruded magnesium alloys, belonging to the field of magnesium alloy preparation and processing. The method includes the following steps: S1: Cutting a low-alloy element content magnesium alloy ingot and removing the surface oxide layer to obtain a cast sample; S2: Performing pulsed current homogenization treatment on the cast sample; S3: Removing the surface oxide layer from the homogenized alloy to process it into an extrusion billet; S4: Performing low-temperature extrusion treatment on the extrusion billet under pulsed current assistance. This invention improves the microstructure and corrosion uniformity of low-temperature extruded magnesium alloys while ensuring high strength and plasticity, and is suitable for the efficient and energy-saving preparation of biodegradable magnesium alloy extruded bars and sheets.

This invention discloses a multi-process synergistic method for strengthening and toughening titanium alloys. The method includes: firstly, pre-treating the titanium alloy surface with sandblasting; then, subjecting the pre-treated titanium alloy to solid embedding carburizing treatment; subsequently, under inert atmosphere protection, sequentially subjecting the carburized titanium alloy to solution treatment, rapid cryogenic treatment, and aging treatment; and finally, shot peening the surface of the heat-treated titanium alloy. This invention solves the problem in existing technologies where a single process is insufficient to synergistically improve the strength and toughness of titanium alloys, achieving a synergistic match between high strength and high hardness on the surface of the titanium alloy material and high toughness in the matrix.

The invention discloses a partition induction regulation and control device and method for high-strength steel laser cladding. The partition induction regulation and control device comprises a welding mechanical arm, a laser head, a shielding gas assembly, a magnetic induction coil, an infrared thermometer and a control system. The laser head is clamped at the tail end of the welding mechanical arm; the nozzle is connected with the laser head; the plurality of groups of magnetic induction coils are relatively independent, are arranged on the laser head through a coil bracket, and are used for performing zoned temperature control on a cladding area; the infrared thermometer is arranged on the coil bracket and is used for measuring the temperature of a cladding area; the laser head, the welding mechanical arm, the shielding gas assembly, the magnetic induction coil and the infrared thermometer are all connected with the control system. According to the zoning induction regulation and control device, zoning temperature control is conducted on a cladding area, precise regulation of local temperature is achieved, infrared temperature measurement real-time feedback and closed-loop control are combined, the uniformity and metallurgical bonding strength of a cladding layer can be remarkably improved, and cracks and defects are reduced.

The application relates to the field of ceramic materials, and particularly discloses high-thermal-conductivity alumina ceramics and a preparation process thereof. The high-thermal-conductivity alumina ceramics are prepared from 50-70 parts of alumina powder, 40-50 parts of alumina fiber, 8-15 parts of a sintering aid, 0.7-1.5 parts of a dispersant and 0.2-0.3 parts of a binder, wherein the sintering aid is beryllium-zirconium composite fiber. The high-thermal-conductivity alumina ceramics have excellent thermal conductivity and mechanical properties, and have important application prospects in the field of heat dissipation of high-performance electronic devices. In addition, the preparation process can reduce the sintering temperature of the alumina ceramics, form a more uniform and refined grain system in the alumina ceramics, and significantly improve the thermal conductivity of the alumina ceramics.

The invention discloses high-purity heat-resistant quartz ceramic and a preparation method and application thereof, and belongs to the technical field of inorganic non-metallic materials, the high-purity heat-resistant quartz ceramic comprises the following raw materials by mass fraction: 50-80% of a fused high-purity quartz raw material, 10-50% of fused high-purity quartz fine powder, 0.1-1% of a composite mineralizer, and 0.1-5% of a binder; the content of CaO in the high-purity heat-resistant quartz ceramic is less than or equal to 0.1%. The aspects of raw material deep processing, additives, the preparation process and the like are strictly controlled, the addition of calcium-containing substances is avoided, the eutectic point phase is fundamentally reduced, the alkali corrosion resistance and the high-temperature strength are further improved, and the finally obtained quartz ceramic has the advantages of high refractoriness under load, excellent thermal shock resistance and corrosion resistance, and the service life of the quartz ceramic is prolonged. The method is suitable for severe environments such as oxy-fuel combustion glass kilns.

The invention discloses a method for optimizing parameters for a steel pipe expanding process by using a thermal simulation experiment technology. The method comprises the following steps: S1, sample preparation: cutting out a plurality of cylindrical thermal simulation samples from a target steel pipe; s2, designing a scheme, namely setting a plurality of groups of process parameter combinations including a heating temperature T, a heat preservation time t, a deformation rate epsilon 1 and a deformation epsilon 2; s3, performing thermal compression experiments: performing multiple groups of thermal compression experiments on the sample on a thermal simulation experiment machine according to the parameter combination; s4, structure analysis: analyzing the metallographic structure of the test sample after the experiment, and determining process parameters corresponding to the test sample which is completely recrystallized and has refined grains; and S5, window determination: based on an analysis result of S4, determining an optimal process parameter window for enabling the steel pipe to be subjected to complete recrystallization and grain refinement. The invention further discloses a diameter expanding method. The purpose of the invention is to realize accurate control of the expanding process by combining a thermal simulation experiment with industrial production.

The application discloses an iron-based barium sodium niobate ceramic material with high energy storage performance and a preparation method thereof. 4‑2x Sm 2x Na2Fe x Nb 10‑x O 30 , wherein 1<=x<=1.25. Barium carbonate, samarium oxide, sodium carbonate, ferrous oxide and niobium pentoxide are used as raw materials, and a standard solid-phase method is adopted to sinter the iron-based barium sodium niobate ceramic material. In the product formula, iron is used to replace niobium in the barium sodium niobate, which is lead-free, environment-friendly, rich in iron reserves and low in price, and is beneficial to control the cost of raw materials. In addition, the iron replacement is beneficial to enhance the relaxor ferroelectric performance of the material, can obtain a more slender hysteresis loop, and improves the energy storage efficiency of the material. The prepared ceramic material has few pores and cracks, high density, and the microstructure is obviously improved, the grain size is more fine and uniform, the ferroelectric polarization intensity and the breakdown field strength are significantly improved, the problem that the barium sodium niobate material is difficult to sinter is solved, and the ferroelectric performance and the energy storage performance are significantly improved.

The invention relates to the technical field of metal material preparation, in particular to a tantalum-tungsten-based nano composite target material and a preparation method thereof. The method comprises the following steps: smelting a high-purity tantalum block and a high-purity tungsten block, and casting to obtain a tantalum-tungsten prealloy cast ingot; the tantalum-tungsten pre-alloy cast ingot is subjected to atomization powder making, and Ta-W alloy powder is obtained; the Ta-W alloy powder is mixed with a nano carbon material, and TaW-C mixed powder is obtained; and the TaW-C mixed powder is subjected to magnetic field assisted sintering, grain oriented growth is induced, aftertreatment is conducted, and the tantalum-tungsten-based nano composite target material is obtained. The magnetic field assisted sintering adopts a one-way static magnetic field along the direction vertical to the target surface, and the magnetic field intensity is 2-10T. According to the preparation method, the Ta-W-based nano composite target material with high density, uniform tissue and texture orientation can be prepared, and the deposited film has the characteristics of low stress, high flexibility and the like, and meets the use requirements of a flexible implanted electrode.

This invention discloses a highly wear-resistant and corrosion-resistant multi-principal element alloy and its preparation method, belonging to the field of metallic material preparation technology. It includes four main alloying elements (Al, Cr, Fe, and Ni) and a dopant element (Mn). The chemical composition of the multi-principal element alloy satisfies the general formula Al... a Cr b Fe c Ni d Mn e Where a is the atomic percentage of Al, b is the atomic percentage of Cr, c is the atomic percentage of Fe, d is the atomic percentage of Ni, and e is the atomic percentage of Mn, with the sum of the atomic percentages of each element being 100%. This invention regulates the phase, microstructure, and elemental distribution of the alloy through Mn doping, resulting in an alloy that possesses high hardness, excellent corrosion resistance, and corrosion wear resistance, as well as good plastic processing performance. The supporting preparation method is simple, with controllable parameters and readily available raw materials, making it suitable for large-scale industrial production. It can be widely used in key structural components of marine engineering equipment and other equipment operating under harsh corrosion-wear coupling conditions.

The present application relates to the technical field of titanium-based cathode roller, in particular to a large-size titanium-based cathode roller and a processing technology thereof, comprising the following processes: step one, taking a blank to carry out high-temperature blooming upsetting, punching, hole expanding, mandrel drawing, and obtaining a ring blank; step two, taking the ring blank obtained in step one to perform dressing and marking inspection; step three, taking the ring blank obtained in step two to perform turning, and obtaining a ring piece; step four, taking the ring piece obtained in step three to perform post-processing, and obtaining a cathode roller. The present application uses a new technology of forging-rolling combination to successfully produce a whole seamless ring piece at one time, which can effectively meet the requirements of the cathode roller on the morphology and mechanical properties at the microstructure level, and eliminate the occurrence of periodic bright band during the production of copper foil by the customer.

The application discloses a kind of CL-AuNPs@CD-MOF / Zein-PLA antibacterial films and preparation method and application thereof.The application is prepared gold nanoparticle (AuNPs) by green synthesis strategy, with CD-MOF as stabilizer, p-coumaric acid (p-CA) as natural reducing agent, by reducing tetrachloroauric acid (HAuCl4), CD-MOF is obtained by covalent crosslinking modification CL-AuNPs@CD-MOF with diphenyl carbonate (DPC), finally it is introduced into corn alcohol-soluble protein (Zein)-polylactic acid (PLA) composite film, utilize Zein excellent oxygen barrier property and PLA excellent mechanical property mutual coordination, construct the respiration microenvironment with suitable water vapor and oxygen permeability, so as to effectively inhibit the proliferation of microorganism on the surface of agaricus bisporus, and maintain its sensory quality.The composite film has significantly enhanced water stability, realizes the sustained release of gold nanoparticles, can effectively inhibit the microbial infection of agaricus bisporus after harvest.

This invention relates to the field of welding technology, specifically to a method for strengthening the heat-affected zone (HAZ) of thick low-carbon, low-alloy ship steel plates that withstand high heat input welding; more specifically, it relates to a method for strengthening the HAZ of thick low-carbon, low-alloy ship steel plates that withstand high heat input welding and its application. This invention uses a first flux as a printing material, which is melted onto the surface of a steel substrate via arc printing to obtain a steel billet. The first flux is mainly composed of CaF2, SiO2, MnO, and TiO2 in a mass ratio of 25–32:25–32:25–32:4–25. The steel billet is then rolled and welded. This method has advantages such as simple operation, low cost, short time consumption, and high production efficiency. Furthermore, the steel heat-affected zone prepared by this method has a large number of fine, dispersed inclusions and fine grains, greatly improving the mechanical properties of the heat-affected zone.

The application discloses a method for preparing high-purity dihydrate gypsum from hemihydrate phosphogypsum in an organic acid system and belongs to the technical field of comprehensive utilization of phosphogypsum. The method comprises the following steps: preparing an organic acid solution and heating, mixing the organic acid solution with hemihydrate phosphogypsum dry base and water in proportion, performing a hydration recrystallization reaction at constant temperature, adding sulfuric acid of a proper concentration to modify the crystal, and finally filtering and washing the product, recycling the organic acid solution in a closed loop, drying the filter cake and obtaining high-purity dihydrate gypsum. The method can effectively break the impurity wrapping effect and deeply remove phosphorus and fluorine impurities, solves the problems of incomplete removal of phosphorus and fluorine impurities, high residual of insoluble impurities, low resource recovery rate and poor performance of finished products in the existing inorganic acid modification process, and significantly improves the purity of dihydrate gypsum and the recovery rate of phosphorus and fluorine, thereby realizing high-value and resource utilization of hemihydrate phosphogypsum.

The application discloses a processing method of a high-entropy alloy, which comprises first laser action, second laser action, electric field action and He + ion irradiation, coupling of the three means, and can realize improvement of the corrosion resistance of the high-entropy alloy, and through accurate matching and regulation of multiple process parameters, a synergistic effect is realized. Specifically, a certain amount of He + ion irradiation can improve the residual stress distribution and mechanical properties of the surface layer of the high-entropy alloy, the electric field action can improve the diffusion of the composition of the high-entropy alloy, and the laser action can optimize the microstructure, so that the pitting corrosion resistance, the crevice corrosion resistance and the stress corrosion resistance of the high-entropy alloy can be significantly improved as a whole, the comprehensive corrosion resistance of the high-entropy alloy is significantly enhanced, and the market application value of the high-entropy alloy is increased, so as to meet the demand of nuclear power plants for corrosion-resistant materials.

This invention discloses a composite Li-Ca-Ce-LSX hydrophobic molecular sieve, its preparation method, and its applications. The method further modifies Li-LSX molecular sieves with Ca and Ce, synthesizing the composite Li-Ca-Ce-LSX hydrophobic molecular sieve via an aqueous solution exchange method. The preparation method of this invention is simple, and the obtained composite Li-Ca-Ce-LSX hydrophobic molecular sieve has a particle size of 0.2~0.4 mm, exhibits good crystallinity and adsorption performance, high polarizability, high adsorption capacity for nitrogen and nitrogen-oxygen separation coefficient, and a certain degree of hydrophobicity. This significantly improves the molecular sieve's environmental sensitivity and extends its service life. It can be used as a high-efficiency catalyst, heavy metal ion adsorbent, and concrete additive, with a wide range of applications.

The invention discloses a low-porosity, low-iron and low-creep clay brick and a preparation method thereof, and relates to the technical field of refractory materials, and the low-porosity, low-iron and low-creep clay brick comprises the following components in parts by weight: 30-45 parts of a mullite homogenized material, 12-20 parts of Anhui flint clay, 8-10 parts of sillimanite, 15-25 parts of kaolin, 10-20 parts of andalusite powder, 3-5 parts of raw silicon powder, 2-5 parts of potassium feldspar powder and 0.2-0.5 part of hydroxypropyl methyl cellulose. And 3-6 parts of an aluminum dihydrogen phosphate solution. The high-quality clay brick with low porosity, low iron, low creep deformation and high strength is successfully prepared by optimizing the raw material ratio and a composite binding agent system, and the high-quality clay brick is suitable for high-temperature industrial kilns with harsh performance requirements.

The application discloses a kind of crystalline carbon nanoparticles modified composite solid electrolyte membrane construction methods, belong to new energy materials and electrochemical energy storage field, the construction method specific steps are as follows: I: selecting and pre-processing corresponding crystalline carbon nanoparticles, the crystalline carbon nanoparticles after processing is dispersed with polymer matrix Mixing;II: according to preset gradient parameter, the gradient hetero-layer of composite solid electrolyte membrane is constructed, and in the construction process, continuously obtain membrane surface microstructure image;The application can realize the uniform distribution of particle in matrix, improve the structural integrity and mechanical stability of membrane, guarantee the consistency of product quality, facilitate and production line integration realizes automated manufacturing;Meanwhile, the application can shorten curing period and improve crosslinking uniformity, reduce thermal stress damage to material, improve membrane body density, significantly improve interfacial bonding force of membrane layer, avoid interlayer peeling.

The invention discloses a high-strength and high-thermal-conductivity aluminum alloy and a preparation method thereof, relates to the technical field of aluminum alloy materials, and aims at solving the problem that the strength and thermal conductivity of existing related aluminum alloys are difficult to synergistically improve. The preparation process sequentially comprises smelting ultrasonic composite modification treatment, direct-current casting online grain refinement, high-temperature homogenization hot extrusion and two-stage overaging heat treatment, the microstructure of the alloy is optimized through collaborative design of components and the technology, all phases are well combined with an aluminum matrix, the strength and heat conductivity of the aluminum alloy can be synergistically improved, and the service life of the aluminum alloy is prolonged. The preparation process does not need special equipment, parameters are easy to regulate and control, and the preparation method is suitable for large-scale industrial production and can meet the requirements of thermal management components on material structure bearing force and heat dissipation performance.

This invention relates to the field of solid waste cementitious material preparation technology, specifically to a rapid-setting and hardening cementitious material based on calcium aluminoferrite from all solid waste and its preparation method, comprising the following steps: S1. Mixing and stirring modified red mud, carbide slag, mineral powder, and modified mineralizer evenly, and then pressing into shape; S2. Performing a first-stage calcination, calcining from room temperature to 950-1000℃, and then performing a second-stage calcination to 1220-1300℃ and holding at that temperature for 30-120 minutes, and cooling to room temperature to obtain modified mineral phase clinker; S3. Passing through a 200-mesh square hole sieve, mixing with modified multi-element solid waste mineral materials in a mixer, and stirring evenly to obtain the rapid-setting and hardening cementitious material based on calcium aluminoferrite from all solid waste. This invention significantly reduces the calcination temperature of clinker through the synergistic effect of various raw materials, thereby greatly reducing energy consumption and carbon emissions. The complex ionic reaction mechanism and the complementary physicochemical properties of multi-component solid waste enrich the diversity of hydration products and the density of the gel structure, thus ultimately achieving the excellent performance of "fast setting, fast hardening, and high strength" of the all-solid waste cementitious material.

The invention discloses an endogenous titanium carbide reinforced ultrahigh-strength aluminum alloy and a green laser directional energy deposition method thereof, and relates to the technical field of aluminum alloy preparation, and the preparation method comprises the following steps: preparing an aluminum-titanium-carbon nanotube system compact; the aluminum-titanium-carbon nano tube system pressed blank is immersed into an aluminum alloy melt, titanium carbide pre-dispersion is carried out based on an in-situ reaction in the melt, and an endogenous titanium carbide reinforced aluminum alloy cast ingot is obtained; annealing and drawing the endogenous titanium carbide reinforced aluminum alloy cast ingot to obtain an endogenous titanium carbide reinforced aluminum alloy wire; the internally-coated titanium carbide aluminum alloy powder is prepared from the endogenous titanium carbide reinforced aluminum alloy wire, and the titanium carbide reinforced aluminum alloy is obtained through green laser directional energy deposition. The method is reasonable in technological process, has the advantages of being low in cost and short in period, and provides an innovative path for preparation of the high-performance additive manufacturing aluminum alloy.

This invention discloses a release film for multilayer ceramic capacitors and its preparation method in the field of polymer composite materials. The release film uses polyethylene terephthalate as the matrix, combined with a bimodal nanoparticle system composed of specific spherical silica and alumina. It innovatively introduces a bifunctional modifier containing perfluoroalkyl and siloxane groups, as well as a hyperbranched multi-arm block polyester siloxane synergistic interface modifier. The preparation process includes key steps such as nanoparticle surface modification, functional masterbatch melt blending and extrusion, and biaxial stretching molding. Through the synergistic effect of the two special modifiers, the dispersibility of nanoparticles in the matrix is ​​significantly improved, and the interfacial bonding strength is enhanced. This results in a release film with extremely low surface roughness and excellent anti-adhesion properties, while also exhibiting good heat resistance and dimensional stability, fully meeting the requirements of high-end multilayer ceramic capacitor manufacturing processes.

The application discloses a kind of reinforced toughened panel concrete and preparation method thereof, belong to panel concrete preparation technical field.The reinforced toughened panel concrete of the application includes the following components: low-heat portland cement, fly ash, slag powder, silica fume, fly ash microbeads, sand, water, copper-plated steel fiber, polyethylene fiber, high-performance water reducing agent, hydration temperature rise inhibitor and calcium-magnesium composite expansive agent.The reinforced toughened panel concrete of the application can realize the whole process performance optimization of panel concrete from micro defect inhibition to macro toughening and crack control, significantly improve the compressive strength and axial tensile strength and crack resistance of panel concrete, effectively solve the intrinsic brittleness and early shrinkage cracking risk of ultra-high strength concrete.

The invention provides low-to-high temperature-resistant non-pollution hydrogen-purity lubricating grease for rubber and a preparation method and application thereof, and belongs to the technical field of lubricating materials, the lubricating grease comprises the following raw material components by mass percentage: 83% of perfluoropolyether PFPE, 10% of polytetrafluoroethylene PTFE as a thickener, 5% of polytetrafluoroethylene PTFE as a solid lubricant, 2% of nano cellulose nanocrystal, 1% of an antioxidant, 1% of a lubricant, and 1% of a lubricant. By combining a preparation method of nanocrystalline mediation, mixing homogenization and grinding degassing, the defects that an existing lubricant cannot cover a wide temperature range of-40 DEG C to 250 DEG C, impurities are easily released when the lubricant is used on an elastomer to influence the purity of hydrogen, hydrogen embrittlement is easily caused when the lubricant does not concurrently with the elastomer, and the lubricant is easy to fall off at high temperature to cause degradation of a rubber sealing element are overcome; the long-acting lubricating protection of the rubber sealing element under the high-temperature working condition of a shield tunnel and hydrogen energy source scenes such as a hydrogen pipeline valve, a fuel cell stack and a hydrogen refueling station is realized, and the abrasion of equipment parts can be effectively reduced while the stable sealing performance is ensured.

This invention provides an inverted perovskite solar cell, its fabrication method, a perovskite film composition, a crystallizing solvate, an electrical device, and its applications. The method includes: seeding crystals on a substrate with a crystallizing solvate before applying a perovskite precursor solution; the general formula of the crystallizing solvate is A. x PbX4·yDMSO, where A is a cation selected from the following substances: ethylenediamine, butanediamine, heptamethamine, phenylethylamine, piperazine, N,N'-dimethylethylenediamine, N-methylethylenediamine, N,N,N',N'-tetramethylethylenediamine, N,N,N'-trimethylethylenediamine, N,N-dimethylethylenediamine; X is selected from I ‑ ,Br ‑ Cl ‑ x is 1-2; y is 1-3. The PCE of the PSC of this invention reaches 26.13%, FF reaches 86.75%, and after 1000 hours of maximum power point tracking, it maintains 93% of the initial PCE and after 900 hours of isothermal heating at 85°C, it maintains 85% of the initial PCE.

This invention discloses a nickel-molybdenum hydrogen evolution electrode based on a surfactant complex, its preparation method, and its application, belonging to the field of water electrolysis for hydrogen production technology. The preparation method includes: pretreating a nickel mesh substrate and using it as the cathode for electrodeposition in an electroplating solution containing nickel salt, molybdate, complexing agent, and a complexed surfactant; the complexed surfactant consists of at least one anionic surfactant and at least one cationic surfactant. This invention, by introducing a complex system of anionic and cationic surfactants into the electrodeposition solution, synergistically regulates the electrocrystallization process, effectively refining the grains of the nickel-molybdenum alloy catalyst layer, increasing the number of active sites, and significantly reducing the hydrogen evolution overpotential. The electrode prepared by this method achieves a hydrogen evolution overpotential of 100 mA / cm². 2 At the specified current density, the overpotential can be as low as 92.8 mV, and it exhibits excellent stability. This method is simple, low-cost, and reproducible, making it suitable for large-scale preparation of high-performance water electrolysis hydrogen production cathodes.

The application discloses a production and preparation process of a heavy-duty water-based epoxy primer suitable for a high-salt and high-humidity environment, and relates to the technical field of water-based epoxy primer production. The raw materials are as follows: 30-50 parts of bisphenol A type water-based epoxy resin emulsion, 10-20 parts of a curing agent T-31, 3.5-5 parts of a reinforced anti-settling agent, 8-12 parts of zinc phosphate, 5-8 parts of aluminum tripolyphosphate, 10-15 parts of precipitated barium sulfate, 3-6 parts of silicon powder, 0.8-1.2 parts of a polyacrylic acid sodium salt dispersing agent, 0.4-0.8 parts of an organic silicon defoaming agent, 0.3-0.7 parts of an acrylic ester leveling agent and 0.6-1 part of a polyurethane thickening agent. The bentonite in the reinforced anti-settling agent and the modified phosphosilicate zirconium powder can improve the microstructure of the primer system, the coating is more compact, the primer can be conveniently applied to a high-salt and high-humidity environment, and the salt mist resistance of the water-based epoxy primer is enhanced.

This application relates to the technical field of semiconductor processing equipment components, specifically disclosing a special metal chamfering wheel for semiconductor silicon carbide wafers and its processing technology. The special metal chamfering wheel for semiconductor silicon carbide wafers is mainly made of the following raw materials in weight percentages: 7-8% micron-sized diamond, 23-27% copper-tin powder, 60-65% cobalt powder, 2-3% silver powder, and 2-3% silicon nitride powder. This special metal chamfering wheel, through the interaction of the raw materials, has advantages such as high hardness, good thermal conductivity, excellent wear resistance, and high stability during the grinding process, outperforming traditional chamfering wheels and making it suitable for processing silicon carbide wafers.

This invention relates to the field of electrode materials technology, specifically to a method for preparing a manganese-rich precursor for cathode materials. The invention first synthesizes a manganese-nickel bimetallic organic framework using nickel acetate tetrahydrate and manganese acetate tetrahydrate as metal sources and 3,3',5,5'-biphenyltetracarboxylic acid and 2-aminoterephthalic acid as ligands. Then, through the action of a main complexing agent and a co-complexing agent, manganese acetate tetrahydrate, nickel acetate tetrahydrate, cobalt acetate tetrahydrate, and lithium acetate tetrahydrate are deposited on the surface of the manganese-nickel bimetallic organic framework to obtain the manganese-rich precursor for cathode materials. Lithium-ion batteries prepared using this manganese-rich precursor exhibit high coulombic efficiency, excellent cycle stability, and rate performance.