458 results about "Particle aggregation" patented technology

The invention belongs to the technical field of calcium hydroxide preparation, and particularly relates to a preparation method of calcium hydroxide with high specific surface area, which comprises the following steps: S1, adding triethanolamine and diethanolisopropanolamine into water, and uniformly mixing to obtain an active agent solution; s2, mixing quick lime with an active agent solution, and carrying out digestion reaction to generate a calcium hydroxide coarse material; and S3, sieving and drying the calcium hydroxide coarse material to obtain the calcium hydroxide with the high specific surface area. The specific surface area of calcium hydroxide can be remarkably increased through the active agent solution, meanwhile, the uniformity and sufficiency of the quick lime digestion reaction are optimized, the calcium hydroxide particle aggregation phenomenon is reduced, and finally the calcium hydroxide product with the high specific surface area and the high activity is prepared.

The invention provides a carbon powder particle distribution real-time analysis method based on image processing, and the method comprises the steps: applying an adjusted gray threshold parameter to the processing and analysis of a carbon powder particle image, and carrying out the edge extraction, geometric feature extraction and particle size distribution analysis of carbon powder particles again, the adjusted analysis result is used as a basis for regulating and controlling a carbon fiber recovery process; establishing a quantitative relationship between the particle size distribution of the carbon powder particles and the centrifugal rotation rate of the solution by adopting a mathematical statistical method according to a particle size distribution analysis result, and analyzing the influence of the centrifugal rotation rate on particle aggregation and particle size distribution; the carbon powder particle distribution in the carbon fiber centrifugation process is analyzed and monitored in real time, the centrifugation process parameters are dynamically regulated and controlled according to the real-time analysis result, and the online monitored data are used for optimizing the carbon fiber recycling process.

The invention belongs to the technical field of civil engineering materials, and provides an early-strength high-fluidity geopolymer grouting material and a preparation method thereof. The method comprises the following steps: firstly, carrying out heat treatment and chemical regulation on fly ash and granulated blast furnace slag to generate a pre-reaction phase with high reaction activity, and improving the alkali excitation reaction efficiency; then, by preparing a lubricating particle dispersion liquid and utilizing the synergistic effect of a silane coupling agent and interface lubricating particles, the uniform dispersity of the particles is enhanced; by adding the ionic liquid and the functionalized acylamino polymer, the dissolution and activation of the aluminosilicate are accelerated by utilizing the high polarity, the ion shielding effect and the dissolution enhancing performance of the ionic liquid; meanwhile, the amido polymer inhibits particle aggregation and stabilizes the particle dispersion state through the adsorption effect, the amido polymer and the amido polymer cooperate to form a lubricating layer in the slurry, reduce the viscosity of the slurry and improve the fluidity, and the early strength of the material is further improved by accelerating the generation of a gel phase.

The invention discloses a composite regulation and control method for improving the performance of a laser additive manufacturing high-strength aluminum alloy, and relates to the technical field of laser additive manufacturing high-strength aluminum alloy materials, micron-sized ceramic particles and micron-sized AlMgScZr alloy powder are mixed, and ceramic particle reinforced aluminum-based composite powder is prepared. According to the composite material powder, the solidification structure is regulated and controlled through the characteristics of ceramic particles, stress concentration is reduced, and meanwhile the reinforcing phase particle aggregation phenomenon is avoided. The obtained composite material is excellent in quality and few in metallurgical defects in laser forming, and the density reaches up to 99.8% or above. By combining the optimized selective laser melting and heat treatment process, the room-temperature mechanical property of the prepared composite material part is remarkably improved, the tensile strength exceeds 540 MPa, the yield strength exceeds 490 MPa, and the elongation at break exceeds 10%.

This invention discloses a method for preparing a CuZnAlGa-based layered double hydroxide (TLH)-derived catalyst for methanol production from carbon dioxide-rich syngas. Using Cu, Zn, Al, and Ga metal salts as precursors, Na₂CO₃ and NaOH as precipitants, and a mixed alcohol-water solution as an auxiliary solvent, co-precipitation is performed under controlled temperature and pH to obtain a LDH-like catalyst precursor. After high-temperature calcination and in-situ reduction in a hydrogen atmosphere, a layered framework structure of Cu nanoparticles immobilized by oxides is obtained. The LDH-like structure provides lattice confinement, preventing Cu particle aggregation, and the interaction between Cu and the oxides enhances the catalyst surface's adsorption capacity for CO and CO₂, thereby improving the activity and stability of methanol production from carbon dioxide-rich syngas.

To provide a basin area member which has high hydrophilic nature, matte appearance and can suppress slipperiness.SOLUTION: A basin area member comprises: a substrate; and a coating layer covering the substrate. The coating layer has: a ground layer provided on a surface of the substrate; and a surface layer provided on a part of a surface of the ground layer. The coating layer has: a first area where the ground layer is covered with the surface layer; and a second area where the ground layer is not covered with the surface layer. The surface layer includes: a coating film formed of a cured object of a hydrophilic coating in the first area; and an aggregate formed by aggregation of multiple particles in the coating film. The aggregate has parts where two or more particles overlap in a lamination direction. A ratio of an area of the second area to a total of areas of the first area and second area in viewing along the lamination direction is 1.6% or more and 50% or less in the basin area member.SELECTED DRAWING: Figure 3

The invention relates to a CMP (chemical mechanical polishing) composition for obtaining a high-quality SiC single crystal substrate surface. The CMP composition is prepared from the following raw materials in percentage by weight: 20-50 wt% of a polishing abrasive, 3-5 wt% of an oxidizing agent, 0.1-0.5 wt% of a surfactant, 0.2-0.5 wt% of a hydrogen bond regulator, 0.2-1 wt% of a polishing accelerant, 0.01-0.05 wt% of a defoaming agent and the balance of water, the CMP composition is neutral. According to the CMP composition, silicon oxide is adopted as a grinding material, a hydrogen bond regulator, a polishing accelerant and an oxidizing agent are introduced, the CMP polishing rate of a silicon carbide wafer is increased, the surface roughness Ra of the cleaned silicon surface can reach 0.07 nm or below, the cleaned surface is free of large particles (larger than 0.2 micron), meanwhile, the silicon oxide raw material does not need to be treated, and the CMP composition has excellent long-term storage stability; and the system does not have particle aggregation and sedimentation phenomena along with the prolonging of the storage time, and excellent polishing surface quality can be obtained in the subsequent polishing process.

The invention belongs to the technical field of metal-based composite material preparation, and particularly relates to a method for treating a high-volume-fraction particle reinforced aluminum-based surface through friction stir. In order to solve the problems of particle aggregation, uneven distribution and the like in the preparation process of a high-volume-fraction particle reinforced aluminum-based composite material in the prior art, the invention innovatively introduces a method for mixing and adding solid lubricating particles with two-dimensional layered structures and hard particles. According to the method, the interface regulation and control effect of the two-dimensional layered particles is used in cooperation with the special stirring head, uniform distribution of the hard particles in the composite layer is effectively promoted, the hole defect caused by particle aggregation is remarkably reduced, and controllable preparation of the high-volume-fraction particle reinforced aluminum matrix composite is achieved. And subsequent solid solution and aging heat treatment are combined, so that the comprehensive mechanical property and wear resistance of the material are further improved. The method is simple in process and easy to implement, and has good engineering application value.

The invention discloses a preparation method and application of an organic polymer solid electrolyte composite additive. According to the preparation method, a poly (ethylene glycol) diacrylate-mercaptopropyl trimethoxy silane-Li6PS5Cl composite additive material is prepared by adopting a click chemistry reaction; functional groups at two ends of a mercaptopropyl trimethoxy silane molecule are respectively coupled with chemical bonds of polyethylene glycol diacrylate and Li6PS5Cl inorganic electrolyte to construct a stable bonding interface of organic matrix-silane coupling agent-inorganic matrix under the action of chemical bond valence force. The problems that traditional inorganic additives are serious in particle aggregation, poor in compatibility with a polymer solid electrolyte body interface and the like are solved, and by starting with the stability of the internal interface of the additives and construction of ion channels, the organic polymer solid electrolyte is prepared by means of defect regulation and control between organic polymer functional groups and the inorganic additives. The interfacial compatibility and the efficient and rapid ion transmission capability of the material are obviously improved. According to the invention, efficient ion transmission and long-acting cycle stability of an internal interface of the organic polymer solid electrolyte can be realized.

The invention relates to the technical field of fuel cells, and mainly relates to a carbon-supported metal catalyst and a preparation method thereof. The preparation method comprises the following steps: dispersing platinum acetylacetonate, acetylacetone salt of transition metal and a carbon material in a solvent, drying to remove the solvent to obtain a precursor, and annealing for the first time in an air atmosphere to obtain a mixture; annealing the mixture for the second time in a hydrogen-argon atmosphere, cooling, pickling, washing, drying, and annealing for the third time in the hydrogen-argon atmosphere to obtain the carbon-loaded metal catalyst. According to the preparation method, platinum and acetylacetone salt of transition metal are used, after uniform dipping, annealing is directly carried out in the air atmosphere, two-step gas phase reduction is carried out in the hydrogen argon atmosphere, the platinum-based intermetallic compound nano-particles wrapped by the adjustable carbon layer are prepared, particle aggregation is effectively prevented, the prepared catalyst is high in order degree, and the catalyst has good catalytic activity. And the particles are fine and uniformly distributed and have excellent activity.

The invention provides a flow field analysis method capable of optimizing an anti-blocking adjusting stop valve structure, and belongs to the technical field of stop valves, and the method comprises the following steps: S1, based on an energy minimum multi-scale model, dividing each phase medium into a dense phase and a dilute phase through calculation of each phase distribution in each region in a valve; s2, correcting an inter-phase momentum transfer resistance relationship of the liquid-solid two-phase quasi-fluid model, and establishing a mass transfer and drag action relationship between a dilute phase and a dense phase to form a first-stage model; s3, performing medium serialization on the physical image of the first-stage model to form a single dilute phase and a single concentrated phase, establishing a mass exchange and drag action relationship between the dilute phase and the concentrated phase, ensuring that the concentrated phase and the dilute phase meet mass conservation, and constructing a second-stage model; according to the method, the defects of homogeneous hypothesis are corrected through the multi-stage model, the influence of particle aggregation on flow can be reflected, liquid-solid two-phase flow simulation is closer to the actual working condition, and the prediction error of the erosion risk area is greatly reduced.

The invention relates to physico-chemical combined sunscreen water dispersion slurry as well as a preparation method and application thereof. The water dispersible slurry comprises 5-20% of an inorganic sun-screening agent, 25-50% of an organic sun-screening agent, 10-30% of a humectant, 5-15% of an emulsifier, 0.1-2% of a preservative and the balance of water. The preparation method comprises the following steps: heating and dissolving the organic sun-screening agent, and cooling to room temperature; dispersing the emulsifier into the humectant, and uniformly stirring to prepare D-phase gel; adding inorganic sun-screening agent powder and the organic sun-screening agent liquid into the D-phase gel, and stirring at a high speed to obtain viscous O / D-phase gel; the mixed water and the O / D phase gel are stirred and dispersed into O / W emulsion; and carrying out high-pressure homogenization on the O / W emulsion. The water dispersible slurry can be used as a raw material to be applied to sunscreen daily cosmetics, especially O / W type sunscreen cream. By precisely regulating and controlling D-phase emulsification and a high-pressure homogenization process, a stable nano dispersion system is constructed, particle aggregation is inhibited, and the stability of the water dispersion slurry is improved. The prepared sunscreen water dispersible slurry is easy to disperse and suitable for various sunscreen systems, and the production efficiency is greatly improved.

The invention relates to a lithium iron phosphate electrode material and a preparation method and application thereof, and belongs to the technical field of electrode materials. According to the preparation method of the lithium iron phosphate electrode material, a layer of uniformly-coated polydopamine is formed on the surface of lithium iron phosphate by utilizing the self-polymerization effect of dopamine hydrochloride, and a three-dimensional N-doped carbon coating layer is formed on the basis of retaining an original carbon layer after high-temperature calcination. The heteroatom doping can form vacancies in the carbon material, and the N element has relatively strong electronegativity, so that the electronic conductivity of the carbon layer can be improved, and the rate capability of the material is improved. By selecting the particle size of the lithium iron phosphate and the dosage of the dopamine hydrochloride, a coating layer with a proper thickness can be formed on the surface of the lithium iron phosphate, so that particle aggregation is avoided, the rate capability and the specific discharge capacity of the material are improved, and high compaction, high specific discharge capacity and high rate capability of the material are considered.

The invention belongs to the technical field of kitchen ware coatings, and discloses a preparation method of a wear-resistant coating based on nano structure optimization, through a specific ratio of nano silicon carbide, titanium dioxide, boron nitride and silver, four particles form a complementary and synergistic functional system-silicon carbide provides a hardness basis, boron nitride optimizes the antifriction performance by means of a layered structure, and the wear-resistant coating is prepared. Titanium dioxide enhances the chemical stability; by matching with a composite dispersion process of high-energy ball milling and ultrasonic treatment, particle aggregation is broken, so that the coating forms a uniform and compact nano-structure, the structure can effectively disperse friction stress, the wear resistance is remarkably improved, and the service life of the kitchen ware in a high-frequency cooking friction environment is greatly prolonged; a kitchen ware substrate is subjected to 80-mesh white corundum sand blasting to form a rough surface, then impurities are removed through ultrasonic cleaning, and a good interface condition is created for coating adhesion; and a subsequent stepped vacuum curing process promotes chemical bonding of the nanoparticles and the polyimide resin, and the binding force of the interior of the coating and the binding force of the coating and the substrate are enhanced.

The present application provides a composite current collector, and a preparation method therefor and the use thereof. The composite current collector comprises: a polymer supporting layer; a transition layer, which is provided on the surface of at least one side of the polymer supporting layer, wherein the material of the transition layer comprises a nano metal material modified with a silane coupling agent, the nano metal material comprising a nano metal simple substance and / or a nano metal oxide; and a conductive layer, which is provided on the surface of the transition layer along a direction away from the polymer supporting layer. In the present application, introducing the nano metal material modified with a silane coupling agent as a transition layer can tightly combine the organic and inorganic interfaces, and improve the bonding force between the polymer supporting layer and the transition layer; in addition, the particle aggregation degree can be reduced by means of the modification of the silane coupling agent, such that the particles are evenly distributed in the transition layer, thereby improving the bonding force between the conductive layer and the transition layer. The composite current collector has excellent bonding force and stability; and the safety performance and high-temperature cycle performance of a battery prepared on this basis are significantly improved.

The invention provides a preparation method of a nickel-based WC alloy coating on the surface of a glass mold punch. The preparation method sequentially comprises the steps of matrix pretreatment, hypersonic flame spraying, ultrahigh-speed laser remelting and aftertreatment. The nickel-based WC alloy coating is prepared on the surface of the glass mold punch by adopting a supersonic spraying and ultra-high-speed laser remelting composite process, on one hand, a mechanical interlocking framework is formed by adopting nano-scale WC powder and micron-scale WC powder composite double-peak gradient powder, rare earth oxide is doped, nano-particle aggregation is inhibited through a vacuum ball-milling process, and the mechanical interlocking framework is formed by adopting a double-peak gradient powder composite double-peak gradient powder; the compactness of a cladding layer is improved; and on the other hand, the parameters of the composite technology are controlled, it is guaranteed that nanoscale WC is completely dissolved in a molten pool, a W-C-Fe diffusion layer is formed on an interface, a WC / W2C hard phase is separated out after micron-sized WC is partially dissolved, the bonding strength is improved, and the compactness and hardness of the coating are improved.

A method for removing particles from water, the method comprising: supplying gelatinous zooplankton mucus to water comprising particles; allowing formation of particle aggregates in the water by allowing interaction between the particles in the water and the gelatinous zooplankton mucus; removing the particle aggregates from the water by passing the water comprising particle aggregates through a filter configured to receive water comprising particle aggregates and further filter the water; and exiting filtered water from the filter. A system for removing particles from water with the aforementioned method is also provided. Additional embodiments of the system and method for removing particles from water are disclosed herein.

The invention discloses a plastic particle mixer for cable material processing, and relates to the related technical field of plastic waste recycling, the plastic particle mixer comprises an arranged mixing box, two groups of feeding hoppers are arranged on the mixing box, the lower parts of the feeding hoppers are communicated with the top of the mixing box through feeding pipelines, and a driving box is mounted on the mixing box; a motor is arranged in the driving box, the output end of the motor is connected with a rotating shaft, the rotating shaft is connected into the mixing box in a penetrating manner, a stirring structure is mounted on the outer side of the rotating shaft, the stirring structure comprises a stirring part and a scraping plate which are mounted on the outer side of the rotating shaft, and a gas conveying assembly is mounted on the outer side of the rotating shaft. According to the plastic particle mixer for cable material processing, the stirring structure rotates in the mixing box to mix particles, input recycled plastic particles are scattered through cooperation of gas, the problem of uneven mixing caused by particle aggregation is avoided, and the overall mixing efficiency is improved.

The invention relates to the field of inorganic material preparation, and provides a bismuth hydroxide material and a preparation method thereof. The bismuth hydroxide is sphere-like nano-particles with the particle size of 85-175 nm, the dispersity is good, and the purity exceeds 99.8%. The preparation method comprises the following steps: preparing a micelle solution from a polyethylene glycol-polylactic acid (PEG-PLA) block copolymer, adding bismuth salt into the micelle solution, carrying out a reaction, and carrying out centrifugation, washing and vacuum drying to obtain the product. Due to the unique amphipathy of the PEG-PLA micelle, bismuth ions are uniformly distributed, and the uniformity of particles is improved; the hydrophilic chain segment forms steric hindrance to inhibit particle aggregation; meanwhile, the reaction rate is slowed down, and high-concentration ammonia water is combined to ensure high purity of the product. The method overcomes the problems of uneven particle size and agglomeration in traditional preparation.

The invention provides a positive electrode active material and a preparation method thereof, a positive electrode plate, a battery and electric equipment, the positive electrode active material comprises a compound shown in a formula I: Li < 1 + a > M < x > Q < y > O < 2-z > G < z >, a + x + y = 1, and 0 < = alt; 1, 0 < = xlt; 1, 0 < = y < lt >; 0 < = z < 2, and the positive electrode active material has a disordered rock salt structure; the positive electrode active material comprises secondary particles formed by aggregation of primary particles, the ratio of the volume distribution median particle size Dv50 of the secondary particles to the average particle size d1 of the primary particles is 10-400, the secondary particles have pores, and the porosity of the secondary particles is 10-50%. Therefore, the compaction density, the ionic conductivity and the electronic conductivity of the positive electrode active material are improved, and the proper porosity is beneficial to stress release during lattice expansion / shrinkage in the charge-discharge process, so that the generation of microcracks is reduced, and the cycle performance of the material is improved. And thus, the positive electrode active material with relatively high compaction density, particle size, rate capability and long cycle life is obtained.

The invention relates to the technical field of metal powder material preparation, and particularly discloses antimony-doped cesium terbium chloride microcrystalline powder and a preparation method thereof. The chemical composition of the microcrystalline powder is Cs < 5 > Tb < 1-x > Sb < x > Cl < 8 >. 6H < 2 > O, wherein x is equal to 0.05 to 0.30. The preparation method comprises the following steps: mixing cesium chloride, terbium chloride hexahydrate and antimony trichloride according to a molar ratio of 5: 0.8: x; adding pyridine hydrochloride as a chlorine element supplement, wherein the dosage of the pyridine hydrochloride is that 0.05-0.20 mmol of Py.HCl is used for every 1 mmol of CsCl; adding stearic acid as a process dispersant; and through combined treatment of mechanical ball milling and freeze drying, antimony-doped cesium-terbium-chlorine microcrystal powder with regular morphology and good dispersibility is obtained. The method is simple in process and mild in condition, particle aggregation can be effectively inhibited, the crystallinity and dispersion uniformity of the powder are improved, and the prepared microcrystal powder shows excellent optical performance.

The invention provides a dopamine hybrid ligand ZIF-8 / gelatin composite aerogel and a preparation method and application thereof, and belongs to the field of composite aerogel and preparation thereof.The growth rate of ZIF-8 nanocrystals is accurately controlled through dopamine hybrid coordination metal ions, stable ZIF-8-DA hybrid crystals are formed, and the stability of the aerogel is improved. The crystal not only solves the problem that the traditional MOF material is easy to aggregate particles, but also retains abundant chemical functional groups; furthermore, the ZIF-8-DA and a gelatin matrix are compounded by adopting a multi-crosslinking strategy and a freeze-thaw treatment technology to obtain the composite aerogel with a unique three-dimensional porous microstructure, so that the mechanical strength and the structural stability of the composite aerogel are remarkably improved, and the composite aerogel shows better heat-insulating and flame-retardant properties; the composite aerogel material prepared by the scheme has excellent heat insulation and flame retardant properties, and is suitable for high-energy-consumption fields such as building energy conservation, industrial heat management and environmental flame retardance.

According to the electrochemical gradient thickening-excitation micro-motion composite shape-preserving polishing ultra-precision manufacturing method, an electrochemical gradient thickening phase is used for inducing an electrochemical interface reaction to guide charged particles to move directionally and control the particle aggregation effect of suspension liquid, and then a flexible fluid grinding tool is used for generating excitation micro-power perpendicular to the axis for efficient shape-preserving removal. The invention further provides an electrochemical gradient thickening-excitation micro-motion composite shape-preserving polishing ultra-precision manufacturing device. The electrochemical gradient thickening-excitation micro-motion composite shape-preserving polishing ultra-precision manufacturing device comprises a box body, a shape-following polishing device, a power supply auxiliary device, an electrochemical gradient thickening polishing machining suspension liquid conveying device and a polishing auxiliary device. According to the method, the types of machined workpieces are rich, the profile precision can be greatly improved, and the near-atomic scale polishing precision of atoms can be achieved.

The invention relates to a device and method for gathering particles in liquid drops, and the device comprises a micro-channel which is used for providing a channel for the flowing of the liquid drops; the first bulk acoustic wave resonator is tightly attached to the micro-channel, and the working action range of the first bulk acoustic wave resonator comprises the space in the micro-channel; the overall shape of the first bulk acoustic wave resonator is narrowed from the front end to the tail end, the tail end is a convex arc-shaped end part, and the arc-shaped end part is used for enabling particles in a liquid drop to be gathered at a first position in the liquid drop in the process that the liquid drop flows through the first bulk acoustic wave resonator; the tip is located on the downstream side in the micro-channel with respect to the tip. According to the scheme provided by the invention, the particles in the liquid drop can be gathered at the first position in the liquid drop, so that the interaction and the like of different particles in the liquid drop after gathering can be conveniently observed.

According to the invention, a polyether modified polysiloxane and polyether emulsified silicone grease composition is used as an oil phase for emulsion preparation, and hydrophilic silicon dioxide is dispersed in a polyacrylate aqueous solution at a high speed to be used as a water phase for emulsion preparation. The hydrophilic silicon dioxide is stably dispersed in a water phase in the form of fine particles due to the thickening and stabilizing effects of the polyacrylate. In emulsion preparation, the emulsion has excellent stability due to a net structure formed by hydrogen-bond interaction among hydroxyl groups on the surface of hydrophilic silicon dioxide, nanoscale polyether modified polyacrylate latex introduced by compounding in the later stage is adsorbed on the surfaces of particles in the emulsion, demulsification caused by particle aggregation is prevented, and the dispersion stability of the defoaming agent is further enhanced. Besides, the used hydrophilic white carbon black, polyacrylate and polyether modified polyacrylate almost have no influence on the clarity of the liquid detergent, and the silicone polyether emulsified silicone grease composition is combined, so that the compatibility of the silicone grease composition and the liquid detergent is increased, and meanwhile, the clarity of the liquid detergent is also ensured.

The invention relates to the technical field of nano material preparation, and discloses an emulsified nano calcium carbonate preparation device which comprises a processing tank, a sealing mechanism is arranged at the top of the processing tank, a feeding mechanism, a stirring mechanism and a circulating mechanism are arranged on the sealing mechanism, and a cleaning mechanism and a fixing mechanism are arranged outside the processing tank. And a discharging mechanism is arranged at the bottom end of the processing tank. The possibility of particle aggregation is effectively reduced through the stirring mechanism, an emulsification system with more uniform particle size distribution can be obtained, waste heat recycling is achieved through the circulating mechanism, heat is prevented from being directly dissipated to the external environment and wasted, the energy utilization rate is effectively increased, and finally through the cleaning mechanism, the energy utilization rate is increased. The timely cleaning mode can prevent the situation that nano calcium carbonate is attached to the tank wall for a long time and becomes more difficult to clean, the inner wall of the processing tank is kept relatively clean all the time, and the overall production efficiency is improved.

The present invention relates to a preparation process of a high-density tungsten-copper alloy. The preparation process comprises: mixing oxide powder of copper having a certain proportion with oxide powder of tungsten in a dual-power mixer, performing crushing and activation treatment on the mixed powder in a high-speed crusher, and then reducing in a hydrogen atmosphere to obtain the nano tungsten-copper composite powder; and carrying out sheathing, degassing, and hot isostatic pressing treatment on the nano tungsten-copper composite powder, carrying out thermoplastic processing, and then carrying out annealing treatment to obtain the high-density tungsten-copper alloy. The process of the present invention is simple and controllable, has high operability, and is easy to industrialize; the phenomena of component segregation caused by preparation of the tungsten-copper alloy by an infiltration method, and uneven crystal grain size caused by particle aggregation and growth are avoided; and the proportion of the two-phase components can be accurately regulated, so that the tungsten-copper alloy with a tungsten content of 5%-95% can be prepared. The density (relative density) of the prepared tungsten-copper alloy reaches 99.6% or above; the oxygen content is lower than 40 ppm; the alloy has a uniform structure; the crystal grains are fine; and the present invention has wide application prospects and popularization value.

The invention belongs to the field of composite materials, and relates to a preparation method of a modified composite material with uniformly dispersed high-content aluminum alloy particles, which comprises the following steps: mixing 20-50wt% of aluminum alloy particles and epoxy resin according to a certain proportion to obtain a mixture, and combining the mixture with carbon fibers to obtain a prepreg; paving a plurality of layers of prepregs on the forming mold, and sealing a bag to obtain a cured and formed sample piece; the sample piece is put into vibration equipment to be heated and cured, the curing temperature ranges from 75 DEG C to 85 DEG C, and heat preservation is conducted within 60 min; putting the sample piece into an autoclave, heating to 110-130 DEG C, pressurizing to 0.5 MPa or above, keeping the temperature for 90 minutes or above, and cooling to obtain a cured and molded modified composite material; and vacuumizing is kept during both the heating period and the cooling period. According to the invention, through a composite curing method of first vibration and then high pressure, the problems of particle aggregation and overhigh porosity in the high-content aluminum alloy particle modified composite material can be smoothly solved.

The invention discloses a reagent group for synergistically promoting sedimentation and rheological properties of high-alkali flotation copper tailings and application, and belongs to the technical field of tailings treatment. The agent group comprises an interface regulating agent A and a flocculating agent B; the interface regulating agent A simultaneously contains sodium stearate and sodium laurate; and the flocculant B is anionic polyacrylamide. In the treatment process of the high-alkali flotation copper tailings, an interface regulating agent A and a flocculating agent B are added at the same time to treat fine particles of the copper tailings. The interface regulating agent A is used for copper tailing surface modification, the flocculating agent B is used for copper tailing fine particle aggregation, the copper tailing fine particles are rapidly flocculated and settled through the synergistic effect of the interface regulating agent A and the flocculating agent B, and the rheological property of ore pulp is improved. Through the synergistic effect of the trace interface regulating agent and the flocculating agent, the sedimentation rate of the ore pulp can be effectively increased, meanwhile, the flowability of the ore pulp is improved, the conveying energy consumption of the ore pulp is reduced, and pipeline abrasion is reduced.

The invention discloses an enrichment device of an active high-sensitivity Raman substrate based on surface acoustic waves and a preparation method, and belongs to the technical field of surface enhanced Raman detection. The device adopted by the method comprises a heating module and an enrichment module. And the heating module controls the temperature change, so that chip breakage caused by overheating is avoided. In the enrichment module, when an alternating electric signal is applied, an interdigital electrode excites the surface of the chip to generate surface acoustic waves, and then vibration of solid particles is triggered, so that target particles move along the surface of the substrate and are enriched. Meanwhile, the device adopts a portable hydrophobic film, so that the device is convenient to paste and extract, particles in the liquid drops are gathered, and the enrichment speed and the drying efficiency of the particles are remarkably improved. The method is simple and convenient to operate, and provides enrichment and drying treatment for subsequent target particles: to-be-detected particles or molecules are concentrated to a specific area, so that the detection sensitivity of the to-be-detected particles or molecules in Raman spectrum analysis is remarkably improved; and a solution in a liquid sample can be quickly evaporated into solid residues, so that further analysis is facilitated.