415 results about "Powder mixture" patented technology

The invention belongs to the technical field of fuel cells, and particularly relates to a preparation method of a dry-method membrane electrode and the prepared dry-method membrane electrode. The preparation method of the dry-method membrane electrode comprises the following steps: firstly, dispersing carbon carrier powder in water, and then adding a perfluorosulfonic acid resin solution to disperse again; drying the obtained dispersion system, adding platinum black powder, and grinding to obtain a powder mixture; and finally, electrostatically spraying the powder mixture on two sides of the proton exchange membrane, and carrying out hot rolling to obtain the proton exchange membrane. According to the manufacturing method of the dry-process membrane electrode, the swelling deformation of the membrane when the membrane encounters a solvent is effectively avoided; and agglomeration caused by hydrophilicity and high autohension of the perfluorosulfonic acid resin powder is effectively avoided, coating of the perfluorosulfonic acid resin on the catalyst is improved, proton conduction is effectively improved, and anode transmission resistance is reduced.

Examples include a device for coating a carrier substrate with a powdered material. The device includes an application unit having a first roller and a second roller which, at a nip thereof, form a first gap through which a powder mixture can be conveyed to form a dry film. A counter-pressure roller, together with the second roller or another roller arranged between the counter-pressure roller and the second roller, forms a second gap through which the carrier substrate to be coated can be guided for having the dry film applied to the carrier substrate. The first gap between the first and second rollers can be adjusted based on a position-based positioning drive by being set to a constant and / or defined gap width, and the second gap can be adjusted based on a force-based positioning drive, and can be set to a constant and / or defined contact force or linear force.

The invention relates to the technical field of 3D printing building materials, in particular to a 3D printing geopolymer composite material with low drying shrinkage and a preparation method thereof.The 3D printing geopolymer composite material is prepared from, by mass, 400 parts of slag powder, 320 parts of fly ash, 80 parts of steel slag micro powder, 1200 parts of quartz sand, 5.1-25.6 parts of sodium hydroxide, 46.4-66.9 parts of sodium silicate, 8 parts of barium chloride and 296 parts of water. The preparation method comprises the following steps: fully mixing the slag powder, the fly ash, the steel slag micro-powder and the quartz sand according to a preset mass ratio to obtain a uniform basic powder mixture; adding an alkali activator and barium chloride into the basic powder mixture, and continuously mixing until the mixture is uniform to obtain a first mixture; and adding water into the first mixture according to a preset water-binder ratio, and carrying out stirring treatment according to a preset stirring method to obtain the 3D printing geopolymer composite material with low drying shrinkage. According to the invention, the drying shrinkage can be reduced.

The invention relates to the technical field of runner inserts in fusion reactor cladding structures, in particular to a SiC ceramic-based composite runner insert and a preparation method and application thereof.The preparation method includes the steps that a pyrolytic carbon interface is deposited on SiC prefabricated cloth, and the SiC prefabricated cloth deposited with the pyrolytic carbon interface is obtained; the preparation method comprises the following steps: mixing SiC powder, ZrO2 powder and Al2O3 powder to obtain a filler powder mixture, mixing the filler powder mixture with water, and then adding polycarbosilane to obtain mixed slurry; the mixed slurry is coated on SiC prefabricated cloth, a SiC prefabricated cloth deposition silicon carbide substrate is subjected to densification treatment and finish machining, then a silicon carbide coating is prepared through chemical vapor deposition, and the SiC ceramic-based composite flow channel plug-in is obtained. The preparation method aims at further enhancing the heat insulation performance and the insulating performance of the SiC ceramic-based composite flow channel plug-in, improving the heat insulation performance of the SiC ceramic-based composite flow channel plug-in and improving the heat insulation performance of the SiC ceramic-based composite flow channel plug-in. The average temperature at the outlet of the runner insert is increased, the pressure drop of the magnetofluid is reduced, high-efficiency energy conversion is realized, and meanwhile, long-term safe operation of a reactor is ensured.

The invention discloses a preparation method of a porous metastable state iridium oxide composite catalyst, which comprises the following steps: uniformly mixing iridium salt, inorganic salt, metal salt, a dispersant and pre-ground sodium nitrate in a solvent, and adjusting the pH value of the solution to 1-3 to obtain a uniformly mixed solution; removing the solvent from the mixed solution to obtain a uniform powder mixture; uniformly grinding the powder mixture, and performing high-temperature roasting in a muffle furnace to obtain a composite metal oxide; and fully washing and drying the composite metal oxide to obtain the porous metastable iridium oxide composite catalyst. The iridium oxide is doped and compositely modified by adopting the inorganic salt, the metal salt and the pore-forming agent, the internal lattice structure, the electronic state and the void structure of the iridium oxide are adjusted, the catalytic activity and the stability are improved, and the method is simple, easy to implement, high in yield, capable of achieving large-scale mass production and beneficial to industrial application.

This invention belongs to the field of photovoltaic recycling, specifically relating to a method for the comprehensive recycling of waste photovoltaic modules, comprising: disassembling waste photovoltaic panels to separate photovoltaic laminates, aluminum frames, and junction boxes; crushing the photovoltaic laminates to obtain photovoltaic crushed material; subjecting the photovoltaic crushed material to a decomposition reaction to break down the EVA adhesive into non-adhesive molecules; sorting the decomposition reaction-treated photovoltaic crushed material to separate glass, plastic backsheets, and copper powder to obtain a silicon powder mixture; dissolving the silicon powder mixture to obtain a silver-containing solution and silicon powder precipitate; separating the silicon powder precipitate and converting the silver-containing solution into elemental silver for recycling. This invention performs in-depth processing based on physical sorting, further purifying the silicon powder while obtaining valuable metallic silver, increasing economic benefits, reducing recycling costs, and achieving efficient and green recycling of photovoltaic modules.

The invention relates to a mixing conveyor for an injection molding system, in particular a thixomolding injection molding system, or the like for conveying a granule-powder mixture, comprising the following:a mixing container (10), with at least one feed (11, 13) for granular material (12) and / or powdery material (14); andat least one mixing device (13a, 13b, 13c, 13d) which is designed to mix the granular material (12) and the powdery material (14) to form a granule-powder mixture; anda mixing container outlet (15), which can be arranged in particular in the vicinity of a melting area (51) of the injection molding system (50) or the like, and is designed to discharge the granule-powder mixture or to feed it to the injection molding system (50) or the like for at least partial melting.

Calendering methods that accurately and / or precisely calender dry electrode films, and systems thereof, are described. The methods and systems are able to control the calendering nip and / or calendering distance between the calendering rollers with and / or without the presence of an electrode film and / or electrode powder mixture such that the variation of the calendering distance is reduced.

The present invention discloses a transition metal carbonitride-SiC x N y Composite ceramics and a preparation method thereof, comprising: mixing MeSi2 powder and carbon powder and then ball-milling them uniformly, drying and further grinding them to obtain a fully mixed powder mixture; pressing the powder mixture into a ceramic body by a cold pressing process; subjecting the ceramic body to a high-temperature heat treatment in a nitrogen environment, and cooling the ceramic body to obtain a transition metal carbonitride-SiC x N y Composite ceramics. In the process of preparing transition metal carbonitride ceramics, SiC is generated simultaneously. x N y Compared with single-phase ceramics, due to the presence of the second phase, the sintering performance of multiphase ceramics has been greatly improved, and the strength and toughness have been improved. Silicon-based composite carbide ceramics also show better anti-ablation performance, realizing the wide temperature range and high temperature range application of transition metal carbonitrides.

The invention discloses a geopolymer concrete dry blend as well as a preparation method and application thereof, and belongs to the technical field of building materials. The geopolymer concrete dry blend comprises the following components in parts by weight: 20-85 parts of mineral powder; 10 to 35 parts of fly ash; 5 to 30 parts of silica fume; and 5-20 parts of a solid alkali activator A. In addition, the invention also provides a preparation method of the geopolymer concrete dry blend, which comprises the following steps: mixing mineral powder, fly ash and silica fume to obtain a powder mixture N1; mixing a solid alkali activator and a water reducing agent to obtain a powder mixture N2; and mixing the powder mixture N1, the powder mixture N2 and quartz sand to obtain the geopolymer concrete dry blend. In addition, the invention also provides an application of the geopolymer concrete dry blend in preparation of concrete members. A concrete member prepared from the geopolymer concrete dry blend provided by the invention is long in initial setting time and high in strength.

Methods for producing uranium silicide for use as a nuclear fuel. In a first method, a powder composition (optionally in the form of a pellet) comprising uranium dioxide, silicon carbide, and carbon i

Disclosed is a process for manufacturing a powder blend essentially consisting of at least two structurally distinct human milk oligosaccharides (HMOs), the process comprising a) providing at least two spray-dried powders, wherein each spray-dried powder essentially consists of a structurally distinct HMO and b) mixing the at least two spray-dried powders in a vertical convective mixer having a fixed mixing vessel and a motor-driven agitator, wherein the mixing occurs by rotation of the agitator inside the fixed mixing vessel.

The invention relates to the technical field of tungsten-titanium alloy production, and particularly discloses a preparation method of a tungsten-titanium alloy, which comprises the following steps: (1) putting tungsten powder, titanium powder and titanium hydride powder into a ball milling tank of a ball mill, then adding a grinding body and a liquid medium into the ball milling tank, and carrying out wet ball milling to obtain a powder mixed solution; (2) drying the powder mixed solution in a drying oven, and transferring the dried powder mixed solution to a tank mill for grinding to obtain mixed powder; (3) the mixed powder is put into a mold, the mold is put into a vacuum hot-pressing sintering furnace for vacuum hot-pressing sintering, and the tungsten-titanium alloy is obtained; according to the preparation method of the tungsten-titanium alloy, the particle size uniformity and mixing uniformity of the alloy raw material powder can be effectively improved, and then the performance of the tungsten-titanium alloy product is improved.

Powder mixture for the use as building material in additive manufacturing processes, wherein the powder mixture includes a first powder having powder particles of a first thermoplastic polymer material, and a reinforcement material that is at least partially embedded in the powder particles of the first powder and / or adhered to the surface of the powder particles of the first powder. The second powder includes powder particles of a second thermoplastic polymer material which is the same as or different from the first thermoplastic polymer material. The powder particles of the second powder do not include the reinforcement material or include it only in an amount of at most 50% by weight relative to the amount of the reinforcement material in or on the powder particles of the first powder.

The preparation method comprises the following steps that pretreated copper powder, a dispersing agent and water are mixed to obtain a copper powder mixed solution, first silver salt, a first complexing agent and water are mixed to obtain a first silver complexing solution, the first silver complexing solution is dropwise added into the copper powder mixed solution, a replacement reaction is conducted, and the silver-coated copper powder with the compact coating is obtained. Intermediate-state silver-coated copper powder is obtained; second silver salt, ammonia water and a second complexing agent are mixed, a second silver complexing solution is obtained, the second silver complexing solution and the reducing agent solution are dropwise added into the intermediate-state silver-coated copper powder at the same time, an oxidation-reduction reaction is carried out, then solid-liquid separation and washing are carried out, and silver-coated copper powder is obtained; through raw material control and step-by-step reaction of first replacement and second reduction, under the condition of low silver content, the uniformity and compactness of a silver layer are improved, the conductivity / oxidation resistance of the silver-coated copper powder is guaranteed, and finally the photoelectric conversion efficiency of the photovoltaic silver paste is improved.

The invention relates to a high-strength steel slag plate and a forming method thereof, and relates to the technical field of steel slag modification.The forming method of the high-strength steel slag plate comprises the following steps that a silicon supplement is added into steel slag powder and mixed to be uniform, a powder mixture is obtained, and the silicon supplement at least comprises any one of amorphous SiO2 powder or sinking bead powder; adding water into the powder mixture, and stirring to form a mortar mixture; and treating the mortar mixture to form the steel slag plate. The method has the effect of improving the compressive strength of the steel slag plate.

A method for producing binder-coated active battery material agglomerations includes agitating, within a vessel, a volume of a binder-solvent solution across two or more steps with a particulate mixture including active battery material particles. The binder-solvent solution has a solubility limit for a mixture of binder material particles within a first solvent solution at a first set of environmental parameters. While retaining the particulate mixture within the vessel, the particulate mixture is subjected to a second set of environmental parameters across two or more steps which reduces the solubility limit to generate a powder mixture of binder-coated active battery material agglomerations.

The invention relates to a high-frequency electric resistance welding method for a transformer, and relates to the technical field of metal welding. A layer of self-reaction soldering paste is applied to the to-be-welded surface of the coil or the iron core to serve as a middle layer; and performing high-frequency resistance welding after mounting and positioning. The self-reaction soldering paste is the technical core of the invention and is composed of a powder mixture containing a solid chemical reducing agent and nano metal particles and an organic carrier. Under excitation of welding heat, the solid chemical reducing agent is subjected to an in-situ chemical reaction, and metal oxides on a welding interface are effectively removed; and meanwhile, the low-melting-point nano metal particles are rapidly melted, the purified clean interface is filled, and a compact metallurgical bonding layer is formed. Through the synergistic effect of chemical purification and physical filling, a defect-free welding joint is obtained, the welding joint has excellent mechanical strength and extremely low contact resistance, the process window is remarkably widened, and the reliability of the welding process is improved.

The invention relates to a method for producing a bubble-free, X-ray amorphous MAS glass body with a mass ≥ 3 kg and a surface area to volume ratio ≤ 1.5 cm⁻¹, wherein a bubble-free MAS glass body is present if it has fewer than 5 bubbles per 100 cm⁻³ with a size of 0.1 to 0.2 mm and no bubbles > 0.2 mm, wherein the method comprises the following process steps: a) preparing a powder mixture with 10 to 40 mol% MgO, 5 to 30 mol% Al₂O₃ and 40 to 70 mol% SiO₂ or precursors of these raw materials, as well as with auxiliary elements and impurities, wherein the auxiliary elements are elements of Group I and / or Group II and / or Group IV.Main group and / or Fe, wherein a total content of the auxiliary and foreign elements of at least 10 ppm - 300 ppm, in particular at least 30 ppm - 150 ppm, and particularly preferably at least 50 ppm - 100 ppm, is adjusted; b) Melting the powder mixture provided in step a); c) Cooling the melt produced in step b) and comminuting the cooled melt into particles with a diameter ≤ 10 mm; d) Heating and melting the particles obtained in step c); e) Cooling the melt obtained in step d) to obtain a MAS glass body; and f) Performing a hot isostatic pressing operation on the MAS glass body to obtain a bubble-free MAS glass body.

The utility model discloses a granulator, including the work tank, the top intercommunication of work tank has the powder mixture cavity. The utility model discloses adopt this device to control each intelligent conveying valve through intelligent control device, and then control the powder amount of unloading in each storage hopper, and then control powder mixing precision, in order to avoid the powder in storage hopper to gather in the inside of storage hopper and cannot even fall to the powder conveying pipe, and the operator can rotate each stirring rod through the drive assembly, and then the powder in storage hopper is stirred, when the first gear rotates, will drive the slider to reciprocate up and down, enter and drive the support rod and dredging piece reciprocate up and down, when the dredging piece moves up and down, will agitate the powder in storage hopper, after the powder even enters the powder conveying pipe, the powder is conveyed to the powder mixture cavity through intelligent conveying valve, and the device has the advantages of can control powder mixing precision and improve production quality.

The present application relates to the preparation method of thick polycrystalline diamond compact for oil and gas drilling, which comprises the following steps: mixing two or more kinds of diamond powder with impurities removed; sand blasting the cemented carbide substrate; sequentially loading the impurity storage layer, the diamond powder mixture layer, the low-melting-point metal sheet, the cobalt sheet and the cemented carbide substrate into a high-temperature-resistant metal cup; placing the high-temperature-resistant metal cup into a synthetic block and then into a six-surface press; performing two-stage high-temperature and high-pressure sintering, wherein the first stage is sintering at a pressure of 5.5-5.8 GPa and a temperature of 800-1300 DEG C for 60-150 seconds, and the second stage is sintering at a pressure of 6-8 GPa and a temperature of 1490-1580 DEG C for 450-700 seconds; and taking out at room temperature and normal pressure. The impurity storage layer, the low-melting-point metal sheet and the cobalt sheet are arranged, and the high-temperature and high-pressure scanning sintering method is adopted, so that the thickness of the diamond layer reaches 3-4 mm after sintering, and the service life is greatly prolonged.

The invention discloses tungsten steel powder pressing forming equipment, and relates to the technical field of metal powder pressing forming, the tungsten steel powder pressing forming equipment comprises a machine base, a supporting frame is arranged on the machine base, the supporting frame extends outwards to the outside of the machine base, a feeding station, a scraping station and a pressing station are sequentially arranged at the upper end of the supporting frame, a scraping mechanism is arranged above the scraping station, and a pressing mechanism is arranged above the pressing station. A pressing mechanism is arranged above the pressing station, a movable bottom frame is arranged at the upper end of the supporting frame in a sliding mode, a feeding frame is fixedly arranged at the upper end of the movable bottom frame, the upper portion and the lower portion of the feeding frame are of an open structure, a bearing plate is movably arranged in the feeding frame, and lifting of the bearing plate is controlled through a jacking mechanism. The scraping plate is driven by the scraping mechanism to reciprocate on the upper surface of the tungsten steel powder mixture so that the tungsten steel powder mixture can be scraped flat, accumulated materials accumulated at the two ends of the feeding frame can also be pushed flat in the reverse direction, and therefore the flatness of the upper surface of the tungsten steel powder mixture is guaranteed.

The invention relates to a corundum-CMA-magnesium aluminate spinel gradient composite hollow sphere and a preparation method thereof, and belongs to the technical field of refractory materials. The preparation method comprises the following steps: uniformly mixing a calcium raw material, an aluminum raw material and a magnesium raw material, adding a binding agent, and mixing to obtain a mixed raw material; granulating the mixed raw material to obtain spherical particles; mixing the aluminum raw material and the magnesium raw material; secondly, taking spherical particles as cores, and wrapping the powder mixed in the last step in the rotating process of the pelletizer, so as to form a heterogeneous spherical particle precursor rich in CaCO3; fully drying the obtained precursor spherical particles, calcining in a high-temperature furnace, and cooling along with the furnace to obtain the corundum-CMA-magnesium aluminate spinel gradient composite hollow sphere. The corundum-CMA-magnesium aluminate spinel gradient composite hollow sphere prepared by the invention has the characteristics of light weight, good heat insulation property, high use temperature, excellent erosion resistance, high high-temperature strength and good melting point thermal shock resistance.

The application provides a membrane preparation device, a pole piece manufacturing equipment and a membrane preparation method. The membrane preparation device comprises a mixing mechanism, a first feeding mechanism, a second feeding mechanism and an extrusion die. The first feeding mechanism is used for adding a powder mixture containing a powder and a first binder into the mixing mechanism. The second feeding mechanism is used for adding a solution containing a second binder into the mixing mechanism. The mixing mechanism is used for mixing the powder mixture and the solution. The extrusion die is connected to the discharge end of the mixing mechanism and is used for extruding a membrane. When the membrane preparation device is applied to the preparation of an active material layer membrane of a pole piece, the mixing uniformity and the distribution uniformity of the active material mixture can be effectively improved, and the proportion of the active material can be increased. Therefore, the production quality of the pole piece is effectively improved, and the energy density of the battery is effectively improved.

The application relates to a preparation method of a metal-based ceramic composite material and the metal-based ceramic composite material, and steps are as follows: 1. ceramic particle screening and pretreatment: screening and polishing are sequentially performed on the ceramic particles, and the Al2O3 and B4C powder mixture is uniformly sprayed on the surface of the polished ceramic particles in a thermal spraying mode; 2. ceramic preform preparation: after the pretreated ceramic particles, a bonding agent and a mixed powder are uniformly mixed, the mixture is filled into a mold, one-time solidification treatment is performed, a preliminarily formed ceramic preform is obtained, secondary solidification treatment is further performed, and the ceramic preform is obtained; 3. metal-based ceramic composite material pouring forming: the ceramic preform is placed in a casting cavity, metal liquid pouring is performed, and after cooling, the composite material is taken out; 4. heat treatment: the composite material is sequentially subjected to multi-stage normalizing heat treatment and tempering heat treatment, and the metal-based ceramic composite material is obtained. The application solves the problems of ceramic particle peeling and composite layer cracking of the existing composite material.

The object of the present invention is to provide a high-temperature-melt fluororesin powder coating composition containing a filler that can produce a coating film having excellent corrosion resistance and surface properties. The present invention is a powder coating composition comprising a powder mixture comprising: first high-temperature-melt fluororesin particles in which a filler is dispersed; second high-temperature-melt fluororesin particles having an average particle diameter of 10 to 200 μm; and charge modifier particles, wherein the amount of the filler is 7 to 15 weight% based on the total amount of the powder mixture.

The invention relates to the technical field of asphalt mixing station waste powder treatment, and particularly discloses an asphalt mixing station waste powder on-line collection-solidification-granulation integrated treatment method which comprises the following steps: waste powder grading: carrying out on-line negative pressure grading on waste powder generated by an asphalt mixing station; cross-linking detection: detecting the content of asphalt in the fine powder on line; cross-linking modification: adding an organic prepolymer cross-linking agent into the fine powder and introducing waste heat of an asphalt mixing station; mixing the materials: respectively mixing the coarse powder and the modified fine powder with a cement-slag composite curing agent; pressurizing and granulating: granulating the coarse powder mixture and the modified fine powder mixture through a two-stage pressurizing process; and grading and recycling: carrying out waste heat gradient maintenance on the aggregate green body through an asphalt mixing station. According to the method, differential treatment of the coarse powder and the fine powder is achieved through online negative pressure grading, the characteristics of the fine powder are combined with the asphalt content to adapt to crosslinking parameters, and the organic prepolymer crosslinking agent is added, so that the obtained cured product is stable in mechanical property and can meet the long-term use requirement of road engineering.

The invention discloses a method for preparing light recycled aggregate from construction waste, and relates to the technical field of building materials, and the method comprises the following steps: firstly carrying out coarse crushing on broken tiles and concrete blocks in the construction waste, then carrying out secondary crushing, and then screening to obtain a fine aggregate and powder mixture; auxiliary materials, a gelling agent and water are added into the mixture of the fine aggregate and the powder, the auxiliary materials comprise fly ash and clay, and the gelling agent is cement; the mixture is placed in granulation equipment for rolling granulation, and the diameter of formed wet particles is within the range of 5-20 mm by regulating and controlling the water adding amount. The light recycled aggregate is prepared by taking broken bricks and tiles, concrete blocks and the like in the construction waste as main raw materials through the steps of crushing, screening, adding auxiliary materials for granulation, molding treatment and the like, a brand new high-added-value utilization way is provided for low-value construction waste fine materials, the environmental pressure caused by construction waste accumulation is effectively reduced, and the environment pollution is reduced. And cyclic utilization of resources is realized.

Disclosed herein are metal matrix composites and methods of making and use thereof. For example, disclosed herein are methods of making a metal matrix composite comprising a metal matrix reinforced by a high entropy alloy. The methods comprise mixing a first powder and a second powder to form a powder mixture, wherein the first powder comprises a plurality of particles comprising a metal and the second powder comprises a plurality of particles comprising a high entropy alloy. The methods further comprise compacting the powder mixture to form a pellet and adding the pellet to a molten metal, the molten metal comprising the metal in a molten state, thereby melting the pellet to form a molten mixture. The methods further comprise subjecting the molten mixture to an ultrasonic treatment and casting the ultrasonic treated mixture to form the metal matrix composite.

The present invention relates to a process for producing a steel alloy part, which includes providing a steel alloy powder mixture containing SiC, forming the part from the powder mixture using an additive manufacturing technique, and subjecting the formed part to a thermal treatment for a duration of 1 to 150 minutes at a temperature ranging from 600°C to 750°C. This process is particularly suitable for creating parts with enhanced properties, such as cutting tools, bearings, punches, and gears, which can be crack-free and defect-free. The additive manufacturing technique is Laser Powder Bed Fusion. The steel alloy powder mixture composition and preparation method are also detailed, along with the characteristics of the resulting steel alloy part, which comprises a bainitic ferrite matrix with graphite particles and carbides distributed therein.