1144 results about "Aluminium powder" patented technology

The invention relates to the technical field of concrete, and particularly discloses ultralow-density foam concrete and a preparation method thereof. The ultralow-density foam concrete is prepared from the following raw materials in parts by weight: 35 to 60 parts of cement, 15 to 25 parts of steel slag, 8 to 15 parts of lightweight aggregate, 1 to 3 parts of reinforced fiber, 0.5 to 1 part of a foaming agent, 0.1 to 0.3 part of a stabilizer, 0.3 to 0.5 part of a foaming aid and 30 to 70 parts of water, the foaming aid is at least one of aluminum powder, silica fume, calcium stearate and triethanolamine, and the foaming agent is one of an animal protein foaming agent and a rosin foaming agent; the foaming agent and the foaming aid are combined, a stable foam structure is formed in a concrete system, meanwhile, the phenomena of foam merging and foam breaking are reduced, formation of communicating holes is reduced while the foam hole structure is refined, the stability of foam concrete bubbles is improved, and foam collapse is reduced.

The invention discloses a device and a process for recycling perchlorate in fireworks and crackers waste, the process comprises the steps of first-stage washing, first-stage solid-liquid separation, concentration, second-stage washing, second-stage solid-liquid separation and crystallization, the separation, recovery and resource utilization of the perchlorate, aluminum powder and other substances in solid waste can be realized, meanwhile, the waste residue is subjected to innocent treatment, and the recycling of the perchlorate in the fireworks and crackers is realized. The pollution to the environment is reduced; and in the crystallization step, a low-temperature evaporation space is divided into a plurality of units, and the negative effects of overhigh evaporation temperature and sudden temperature increase of perchlorate can be effectively avoided in a manner of changing positions of the cells.

The invention relates to the technical field of flux-cored wires. The preparation method comprises the following steps: weighing the following raw materials in parts by weight: 4-6 parts of chromium carbide powder, 7-9 parts of molybdenum powder, 6-8 parts of nickel powder, 10-15 parts of niobium powder, 15-18 parts of tungsten carbide powder, 7-11 parts of a modified titanium carbide agent, 5-8 parts of a blending agent added based on boron and 2-4 parts of 30-mesh natural graphite; 1-2 parts of sodium fluosilicate; 1-2 parts of aluminum powder; and 70-75 parts of iron powder. The flux-cored wire can adapt to complex service environments of parts such as rollers and continuous casting crystallizers in the metallurgical industry, the service life of the parts subjected to surfacing repair is prolonged, the production efficiency of the parts subjected to surfacing repair is improved, the obtained flux-cored wire achieves balance of high-temperature performance, mechanical performance and low-temperature stability, and the comprehensive applicability of products is improved.

The invention provides a microwave-transmitting and infrared-compatible low-emissivity coating, and belongs to the technical field of camouflage materials. The microwave-transmitting and infrared-compatible low-emissivity coating is of a double-layer structure composed of a bottom microwave transparent layer and a surface infrared functional layer. The microwave transparent layer is made of hollow dielectric microbeads and polyvinylidene fluoride; the infrared functional layer is made of modified flaky aluminum powder, modified hexagonal boron nitride nanosheets and polyvinylidene fluoride. The microwave-transmitting compatible infrared low-emissivity coating provided by the invention has an infrared radiation inhibition effect in two atmospheric window wave bands of 3-5 microns and 8-14 microns, and has high transmissivity in an electromagnetic wave band of 2-18 GHz; the method is especially suitable for the scenes, such as stealth unmanned aerial vehicles, ship decks and 5G base station shells, where infrared characteristics need to be suppressed and microwave signal transmission needs to be kept at the same time.

The invention discloses a method for preparing a light-transmitting gradient multicolor zirconium oxide material through photocuring, which comprises the following steps: preparing modified aluminum oxide which is formed by attaching a strontium element and a chromium element to the surface of aluminum oxide; preparing bottom-layer slurry, middle-layer slurry and upper-layer slurry from the zirconium-aluminum powder; the bottom layer slurry comprises zirconium aluminum powder and a coloring agent; the middle layer slurry comprises zirconium-aluminum powder, a light-transmitting auxiliary agent and a coloring agent; the upper-layer slurry comprises zirconium-aluminum powder, a light-transmitting auxiliary agent and a coloring agent; preparing a bottom layer green body by using the bottom layer slurry through 3D printing by using the photocuring slurry, preparing a middle layer green body on the surface of the bottom layer green body by using the middle layer slurry, and preparing an upper layer green body on the surface of the middle layer green body by using the upper layer slurry, so as to obtain a zirconium oxide material green body; the light-transmitting gradient multicolor zirconia material with gradient light transmission and gradient color is directly prepared through 3D printing, the color of the light-transmitting gradient multicolor zirconia material is closer to that of real teeth, and the strength and toughness are not reduced.

The invention provides a method for improving the manganese recovery rate of a silicon-manganese alloy, which comprises the following steps: sequentially filling smelting raw materials into a closed electric furnace for smelting to obtain an alloy melt; transferring the alloy melt into a steel ladle, and blowing magnesium powder for desulfurization; the desulfurized alloy melt is subjected to slagging-off, and manganese-silicon alloy molten iron is obtained; the manganese-silicon alloy molten iron is poured into a mold for ingot casting, and a manganese-silicon alloy finished product is obtained after cooling; the smelting raw materials are sequentially filled with a backing material, a mixture and a surface material from bottom to top in the closed electric furnace; the surface material comprises aluminum powder and calcium carbide which are mixed according to a certain proportion, in the method, the surface material comprises the aluminum powder and the calcium carbide which are mixed according to a certain proportion, the effect of a reducing agent can be achieved while the ignition effect is achieved, manganese can be directly reduced in the reaction through addition of the aluminum powder, and therefore the effect of improving the manganese recovery rate is achieved.

The invention discloses a sliding plate brick and a preparation method thereof, and relates to the technical field of sliding plate bricks. The sliding plate brick comprises the following raw materials in parts by weight: 30-50 parts of tabular corundum, 20-30 parts of white corundum, 8-12 parts of graphite, 2-5 parts of carbon black, 3-5 parts of metal aluminum powder, 4-6 parts of a binder and 2-4 parts of silicon carbide. The preparation method comprises the following steps: reacting hydroxyl in sodium alginate with chlorine atoms in 4-chlorophenylboronic acid under the action of potassium carbonate to generate boric acid modified sodium alginate; boric acid bonds in the boric acid modified sodium alginate react with hydroxyl groups in tannic acid to generate tannic acid composite sodium alginate; hydroxyl in the tannic acid composite sodium alginate reacts with silicon hydroxyl in the triphenyl hydroxysilane under the action of phosphoric acid to generate the binder. The prepared sliding plate brick has good compression strength and high-temperature fracture resistance.

The invention relates to the field of architectural ceramics, and discloses a tile with a flash and matte composite effect, which sequentially comprises a green body layer, a matte glaze layer, a pattern layer and a flash layer from bottom to top, the glossiness of the matte glaze layer is less than 6GU; the preparation raw materials of the flash layer comprise flash particles, and the flash particles comprise the following components in parts by weight: 60-80 parts of mica titanium pearl powder, 10-20 parts of coating aluminum powder and 5-10 parts of glass beads; and the particle size of the flash particles is 50-250 microns. According to the invention, the matte glaze is combined with the flash particles, the matte glaze provides a soft and convergent substrate, the flash particles form local and bright reflection points on a matte background, and the matte glaze and the flash particles are distinct in contrast and set off each other, so that the matte high-grade texture is kept, and the flexible flash bright points are added; and the complex aesthetic feeling of coexistence of a matte substrate and mineral crystal flash in natural stone is simulated to the greatest extent.

According to the high-thermal-conductivity flame-retardant copper-clad laminate and the preparation method thereof, the thermal conductivity and the limit oxygen index of a copper-clad plate can be effectively improved, so that the high-thermal-conductivity flame-retardant property of the copper-clad plate is effectively improved; modified aluminum nitride and phosphoric acid modified aluminum nitride powder in the heat-conducting filler can keep good hydrolysis resistance in the ball milling process; polyvinyl butyral and polyethylene glycol are compounded as a binder, so that the modified aluminum nitride has good sphericity and surface smoothness, and the spherical aluminum nitride prepared by water-based spray granulation is suitable for being used as a heat-conducting filler of a thermal interface material; modified silicon dioxide in the heat-conducting filler adopts cerium-doped hollow mesoporous silicon dioxide nanospheres coated with polydopamine, and a corrosion inhibitor MBT (2-mercaptobenzothiazole) is loaded by the cerium-doped hollow mesoporous silicon dioxide nanospheres; controllable release of the corrosion inhibitor MBT and rare earth cerium ions is achieved, the process of corroding the cathode and the anode can be inhibited at the same time, and the corrosion resistance and the corrosion self-repairing performance of the copper-clad plate can be effectively improved.

The invention discloses a deoxidizer for metal smelting and a preparation process thereof, and belongs to the technical field of steel for high-strength fasteners, and the deoxidizer comprises aluminum powder, silicon powder, titanium powder, zirconium powder and carbon-coated lanthanum nano powder in a mass ratio of (45-50): (20-25): (15-20): (8-12): (0.2-0.4). In a sol crystallization stage, lanthanum nitrate and a composite ligand form a directionally growing metal organic framework under the assistance of an external field, and a regular pore structure of the metal organic framework provides a nano-scale template for subsequent carbon coating, so that the decomposed organic ligand is gradually carbonized in a segmented heating process and forms a gradient structure; the low-temperature section promotes the carbon layer to be converted from an amorphous state to an ordered state so as to enhance the electron conduction capability, and the high-temperature section forms a through mesoporous network through external energy etching, so that excessive agglomeration of lanthanum nanoparticles is limited, and a controllable release channel is constructed. The preheating and pre-pressurizing process provides support for the nanostructure on the macroscopic scale, and the aluminum powder is softened through low-temperature plastic deformation to fill gaps of the titanium-zirconium powder, so that a compact initial blank structure is formed.

The invention discloses a circulation system of aluminum wire drawing liquid, and relates to the technical field of metal processing, the circulation system comprises: a wire drawing device, which is provided with an immersion liquid box and an outlet die, and after entering the immersion liquid box for drawing, an aluminum rod is sized from the outlet die for molding; a filter is arranged in the wire drawing liquid pool, the filter is communicated with the immersion liquid box through a circulating pipe I, the circulating pipe I is connected with a heat exchanger, and the immersion liquid box is communicated with the wire drawing liquid pool through a return pipe; the cooling system is connected with the heat exchanger through a circulating pipe II; the filter is provided with at least one continuous filtering mechanism, and the continuous filtering mechanism is configured to trigger the continuous filtering mechanism to rotate to switch a new filtering structure when the water level in the filter rises. After the water-based aluminum wire drawing liquid is adopted, no smell is generated in the circulation process, and the surrounding environment of a machine table is clean and tidy. Meanwhile, after the aluminum powder is filtered and is drawn by a nano-mold, the lubricating property is good, and the surface of the aluminum wire is smooth and clean.

The invention discloses a preparation method of angular aluminum nitride large-particle powder, which comprises the following steps: weighing raw material aluminum powder, aluminum nitride powder and a sintering aid according to a ratio, uniformly mixing, carrying out compression molding, carrying out combustion synthesis on a raw material blank in a high-pressure nitrogen atmosphere to obtain aluminum nitride ceramic, and crushing and screening to obtain the angular aluminum nitride large-particle powder of 20-200 mu m. According to the invention, one-step synthesis and sintering of aluminum nitride are realized by utilizing combustion reaction heat release of aluminum powder and nitrogen, the method has the characteristics of simple process and low preparation cost, and the prepared angular aluminum nitride large-particle powder can be used as a high-thermal-conductivity filler for electronic packaging.

The invention provides silicon nitride and aluminum nitride powder and a preparation method, and relates to the technical field of ceramic powder. The preparation method of the silicon nitride and aluminum nitride powder comprises the following steps: mixing aluminum powder and aluminum nitride raw powder to obtain a first mixture; mixing silicon powder, silicon nitride raw powder and ammonium salt to obtain a second mixture; paving the first mixture and the second mixture in a material frame padded with a carbon felt, and separating the first mixture from the second mixture by using the carbon felt; the material frame is placed in a self-propagating reaction kettle, nitrogen is introduced after vacuumizing, and the first mixture is ignited so as to induce a combustion synthesis reaction of the second mixture; and after the combustion synthesis reaction, cooling to room temperature, releasing the pressure in the self-propagating reaction kettle, taking out a synthetic product, and grinding the synthetic product to obtain silicon nitride powder and aluminum nitride powder. The purity of the powder material can be improved.

The invention relates to the technical field of metal materials, and discloses a composite metal material based on micro-nano porous copper powder, which is composed of the following components: a matrix is micro-nano porous copper powder with the particle size of 50-500 nanometers, the porosity is 30-80%, and the pore diameter is 20-200 nanometers; the metal additive comprises 5-20 wt% of aluminum powder and 3-15 wt% of nickel powder; the functional additive comprises 1 to 8 weight percent of titanium powder, 0.5 to 5 weight percent of graphene and 0.3 to 3 weight percent of a carbon nano tube; a nickel-titanium alloy coating with the thickness of 50-500 nanometers is formed on the surface of the micro-nano porous copper powder through electrochemical deposition. Through the graded hole design of the micro-nano porous copper powder, a main hole channel provides a rapid electron transmission path, the powder gap stress is eliminated in the low-temperature pre-pressing stage, and atom diffusion and densification are promoted in the high-temperature and high-pressure stage, so that the resistance can be effectively reduced, the loss of energy in the transmission process is reduced, and the energy transmission efficiency of the whole system is improved.

The invention discloses a quick-curing high-temperature-resistant anticorrosive coating for two-component packaging and a preparation method of the quick-curing high-temperature-resistant anticorrosive coating. The component A of the coating is composed of novolac epoxy resin, epoxy resin, a reactive diluent, an auxiliary agent, an anti-rust pigment, a filler, aluminum powder and a solvent; and the component B consists of phenolic aldehyde amine, alicyclic amine and a solvent. Compared with a traditional phenolic epoxy coating, the product has the advantages of being high in single-time film forming thickness, rapid in curing, resistant to abrasion, high in thermal stability, resistant to cold and hot impact, resistant to corrosion and the like.

The invention relates to the technical field of floor slab concrete, and discloses aerated concrete applied to sound insulation and heat preservation of a floor slab and a preparation method of the aerated concrete aiming at the problems that an existing sound insulation floor slab containing the aerated concrete is poor in structural stability, namely the sound insulation effect and the long-term effect of mechanical properties are poor and the like. Comprising 30-40 parts of fly ash, 25-35 parts of sand, 15-20 parts of ardealite, 10-15 parts of quick lime, 5-8 parts of silicon-aluminum porous microspheres, 3-5 parts of slaked lime, 1-2 parts of Fe3O4-polypropylene fiber and 0.2-0.5 part of aluminum powder. The preparation method of the silicon-aluminum porous microspheres comprises the following steps: mixing a silicon source, an aluminum source and a surfactant, and uniformly stirring to obtain silicon-aluminum homogenate; and adding nano titanium dioxide, carrying out ultrasonic dispersion and freeze drying, transferring into a heating furnace, and heating and calcining to obtain the silicon-aluminum porous microspheres. The supporting and strengthening effects on pores are realized through gas production reaction and the like in the material, so that the structural strength and durability of the aerated concrete are improved.

The invention discloses a preparation method and a formula of coal-based solid waste artificial soil. The preparation method comprises the following steps: step A; the preparation method comprises the following steps: processing coal gangue, fly ash, carbide slag and desulfurized gypsum to form powder with uniform particle size, and then carrying out fluidized calcination; step B; the calcined coal gangue powder and prefabricated multi-component self-setting powder are proportionally mixed to form a mixture, and the mixture and water are mixed to prepare slurry; step C; adding a foaming agent into the slurry, introducing into a mold after foaming, and curing at constant temperature to form a solid test block; according to the method, coal gangue powder is innovatively adopted as a core raw material, self-solidifying powder with coal-based solid waste as a main body is combined to serve as a gelling agent, an aluminum powder foaming agent is supplemented, the coal gangue-based artificial soil is elaborately developed, the novel soil inherits the basic functions of natural soil, and the novel soil is excellent in water retention, loss resistance and heat preservation performance; and an ideal soil alternative scheme is provided for ecological restoration of a mining area.

A high-thermal-conductivity phase change sheet and a preparation method therefor. The high-thermal-conductivity phase change sheet is prepared from the following raw materials in parts by mass: 3-5 parts of a resin, 80-100 parts of a thermally conductive filler, 0.1-1 part of a treating agent, 0.1-1 part of an antioxidant, and 1-2 parts of a phase change material, wherein the resin is low-molecular-weight polyisobutylene, the thermally conductive filler comprises aluminum powder of 10 μm, aluminum powder of 2 μm and zinc oxide of 0.2 μm, and heat treatment and vacuumizing operation are involved in the preparation process.

The invention provides multi-structure-layer flaky silver-coated aluminum powder, a preparation method of the multi-structure-layer flaky silver-coated aluminum powder and a conductive rubber material. The multi-structure-layer flaky silver-coated aluminum powder comprises flaky aluminum powder, a silicon dioxide layer and a silver layer, the silicon dioxide layer is coated on the surface of the flaky aluminum powder, and the silver layer is coated on the surface of the silicon dioxide layer. According to the multi-structure-layer flaky silver-coated aluminum powder, the preparation method thereof and the conductive rubber material, the multi-layer composite structure design of aluminum core-silicon dioxide layer-silver layer is adopted, the problems that aluminum powder is poor in stability and silver is prone to migration are solved, and the multi-structure-layer flaky silver-coated aluminum powder has the advantages of being low in cost and resistant to shearing; therefore, the novel white conductive filler with high performance, high stability and high applicability is obtained.

The present invention relates to a preparation method of a self-propagating anti-corrosion and wear-resistant coating for a boiler water wall, belonging to the technical field of high-temperature protective coatings. The preparation steps are as follows: (1) Aluminum powder, iron(III) oxide powder, chromium oxide powder, zirconia fine powder, alumina fiber, heat-conducting filler and flux are ball-milled and mixed to obtain a mixed powder; (2) The mixed powder and sodium silicate binder are mixed evenly to obtain a suspension slurry; (3) The surface of the boiler water wall is treated by sandblasting; (4) A precoating is made on the surface of the boiler water wall; (5) A sodium silicate layer is made on the precoating; (6) A magnesium strip is ignited to initiate a self-propagating reaction to obtain a protective layer; (7) The protective layer is removed to obtain a self-propagating anti-corrosion and wear-resistant coating on the surface of the boiler water wall. The sodium silicate used as the binder obtains a dense self-propagating anti-corrosion and wear-resistant coating, and the self-propagating anti-corrosion and wear-resistant coating has good thermal conductivity, uniform thickness, excellent mechanical wear resistance and good corrosion resistance.

The invention discloses a device and method for detecting the cleanliness of aluminum powder on the surface of an aluminum foil belt. The detection device comprises an unwinding device, an inlet deflector roller, an aluminum powder collecting device, an aluminum foil belt cleaning unit, an outlet deflector roller, a winding device and a conveying belt. The detection method comprises the following steps: starting detection after mounting the adhesive tape roll, automatically replacing the adhesive tape when a set value is reached, detecting an adhesive tape L value by a color difference meter, calculating cleaning efficiency delta L and judging whether cleaning is qualified or not. The device can adapt to different working conditions, the efficiency of detecting the aluminum powder on the surface of the aluminum foil tape is improved, numerical errors caused by misoperation are reduced, the bottlenecks of low efficiency and poor precision of traditional detection are broken through, and an efficient and reliable cleanliness evaluation scheme is provided for an aluminum foil production line.

The invention discloses high-strength stainless steel for a wheel hub cover and a machining process of the high-strength stainless steel, and relates to the technical field of stainless steel machining. The specific processing technology comprises the following steps: weighing a stainless steel raw material, smelting under nitrogen pressurization, carrying out protective pouring to obtain a cast ingot, carrying out hot forging and hot rolling to obtain a hot-rolled plate, carrying out solution treatment and water quenching, sequentially carrying out multi-pass cold rolling and single-pass liquid nitrogen heat preservation cold rolling, annealing and aging treatment to obtain a stainless steel base material, and sequentially carrying out grinding, polishing, oil removal and acid activation to obtain the stainless steel plate. And then placing in an electroplating solution for electro-deposition of an alloy plating layer, cleaning after electro-deposition is finished, then carrying out laser cladding, finally carrying out heat treatment, and cutting a thin layer to obtain the high-strength stainless steel. Wherein cladding powder adopted for laser cladding comprises cobalt powder, chromium powder, nickel powder, aluminum powder, molybdenum powder, titanium powder, zirconium powder, nano carbon-nitrogen metal and tungsten carbide.

The invention discloses a gradient pressing and pore interlocking titanium-aluminum composite profile preparation method which comprises the following steps: S1, density differential pressing of titanium powder, unequal-thickness powder filling is carried out in a cavity, and a gradient density titanium material layer is formed through pressing; s2, primary sintering is conducted, specifically, the titanium material layer with the gradient density in the step S1 is sintered; s3, aluminum powder is pressed, specifically, aluminum alloy powder is added into the mold for secondary pressing compounding to form an aluminum material layer, and the aluminum powder permeates to the surface of the loose layer; and S4, secondary sintering permeation enhancement is carried out, vacuum sintering and pressure sintering are carried out, the aluminum material layer is in a semi-molten state in the sintering process, and on the basis of the capillary action principle, the aluminum material permeates and fills pores in the loose layer to form pore interlocking. The gradient structure with the compact outer side and the porous inner side is formed on the titanium layer through an unequal-thickness mold and step-by-step pressing, directional pores preset in the porous layer provide channels for aluminum permeation, and the permeation depth reaches 150 microns and is increased by three times compared with a conventional process.

The invention belongs to the technical field of boiler protection. The invention relates to a coating, in particular to a boiler high-temperature-resistant anticorrosive coating and a preparation method thereof. The product provided by the invention comprises a primer, a transition coating and a finishing coat, the primer is prepared from 25 to 30 parts of epoxy modified silane resin, 55 to 60 parts of composite filler, 3 to 5 parts of phosphate anti-rust pigment, 2 to 4 parts of fumed silica and 8 to 12 parts of xylene; wherein the composite filler is formed by compounding flaky zinc powder and hollow spherical aluminum oxide according to the mass ratio of (4-6): 1; the transition coating is prepared from 35 to 40 parts of epoxy-organic silicon copolymer resin, 10 to 15 parts of organic bentonite, 8 to 10 parts of hollow spherical aluminum oxide, 2 to 4 parts of silane coupling agent and 10 to 12 parts of propylene glycol monomethyl ether; the finish paint is prepared from 25 to 30 parts of methyl phenyl type organic silicon resin, 20 to 25 parts of spherical nano silicon carbide, 10 to 15 parts of flaky nano aluminum powder, 8 to 15 parts of micron glass flake, 0.8 to 1.2 parts of silane coupling agent and 12 to 16 parts of xylene.

The utility model provides an aluminum ash screening device, belongs to the technical field of screening devices, and aims to solve the problems that in the aluminum ash screening process of an existing aluminum ash screening device, when a large amount of aluminum ash enters the aluminum ash screening device, the aluminum ash is prone to being accumulated, part of the aluminum ash is discharged without being screened, and the screening efficiency is affected. A fixed shell is fixedly connected to the upper end face of a frame body; the fixed feeding hopper is fixedly connected to the rear end of the fixed shell; a plurality of pulleys are arranged, and the plurality of pulleys are rotationally mounted at the upper end of the frame body; the screening roller is rotationally connected to the inner side of the fixed shell and abuts against the outer sides of the multiple pulleys. The fixed discharging hopper is fixedly connected to the lower end face of the frame body and communicates with the interior of the fixed shell. The lower end of the supporting frame is fixedly connected to the outer side of the fixed shell, and the upper end of the supporting frame is fixedly connected to the lower end face of the fixed feeding hopper. By means of the aluminum powder quantitative feeding device, quantitative feeding of aluminum powder is achieved, and screening efficiency is improved.

The invention belongs to the technical field of target materials, and particularly discloses a silicon-zirconium-aluminum target material for Low-E glass and a preparation method of the silicon-zirconium-aluminum target material for Low-E glass, and the silicon-zirconium-aluminum target material for Low-E glass comprises the following components in parts by weight: 55-60 parts of silicon powder, 34-40 parts of zirconium powder, 4-8 parts of aluminum powder, 1-2 parts of modified graphene, 2-3 parts of high-entropy alloy powder, 0.5-1.2 parts of chromium powder, 0.4-1 part of molybdenum powder and 0.2-0.6 part of nickel powder. The silicon-zirconium-aluminum target material has an excellent energy-saving effect, the heat transfer coefficient and the shading coefficient can be remarkably reduced, and relative heat increase is reduced.

The invention discloses in-situ shell-glue type geopolymer porous concrete and a preparation method thereof.The preparation method comprises the following steps that S1, fly ash, quartz sand, cement, lime, gypsum, borax, a water reducing agent and a foam stabilizer are mixed, and a first mixture is obtained; mixing sodium hydroxide with part of the mixing water to obtain alkali liquor, and adding floating beads into the alkali liquor to obtain a second mixture; mixing the aluminum powder, the nano aluminum hydroxide and the rest of the mixing water to obtain a third mixture; s2, mixing the first mixture and the second mixture, then adding a third mixture, and uniformly stirring to obtain slurry; s3, the slurry is injected into a mold and then coated with a film, then pre-curing treatment is carried out, demolding is carried out after pre-curing is finished, and a pre-product is obtained through cutting; and S4, performing autoclaved curing on the pre-product to obtain the in-situ shell-glue type geopolymer porous concrete. The in-situ shell-glue type geopolymer porous concrete with low heat-conducting property and high compressive property can be obtained.

The invention belongs to the technical field of light metal smelting and nano materials, and particularly discloses a nano aluminum powder electrolysis preparation method based on ionic liquid. The method comprises the following steps: mixing an ionic liquid, an additive and AlCl3 to obtain an electrolyte, and carrying out an electrolytic reaction by taking aluminum as a cathode and an inert electrode as an anode to prepare nano aluminum powder; the additive is specifically halide salt. The halide salt is added as an additive and can partially replace ionic liquid, so that the preparation cost of the nano aluminum powder is reduced; in addition, the halide salt can also avoid the phenomenon that the aluminum powder is adhered to the cathode, so that the particle size of the obtained nano aluminum powder becomes smaller and is more uniform, the nano aluminum powder with narrower particle size distribution is obtained, and the related performance during application is improved. The preparation method disclosed by the invention also has the advantages of low electrolysis temperature and low energy consumption, and the reaction can be protected by adopting a protective atmosphere in the electrolysis process, so that the preparation safety of the aluminum powder is greatly improved.

The invention relates to the technical field of thermite, in particular to a thermite system of an ultralow condensed phase combustion product and a preparation method of the thermite system. The preparation method of the aluminothermic system comprises the following steps: S1, synthesizing nanoscale BiF3 particles; s2, immersing a mixed oxidizing agent into a copper nitrate solution, dropwise adding ammonia water into a system, reacting for a period of time, standing and aging the reaction system, performing centrifugal separation, washing, and performing vacuum freeze drying to obtain BiF3-coated TACN core-shell structure particles; and S3, adding the acid-activated nano aluminum powder and the BiF3-coated TACN core-shell structure particles into an n-hexane medium, carrying out ultrasonic treatment, and drying to obtain thermite powder. Through the high reaction interface of the nano-scale bismuth-based fluoride and the activation strategy of the high-energy gas production compound on the interface, the output of ultralow condensed phase combustion products and the efficient release of system energy are realized.

The invention provides a method for synthesizing aluminum nitride fibers by preheating combustion, which comprises the following steps: preheating aluminum powder and aluminum nitride serving as raw materials in a low-pressure nitrogen environment, and then inducing a combustion synthesis reaction to prepare the aluminum nitride fibers with the average diameter of 0.3-0.8 mu m and the average length of 400-800 mu m. The preparation method has the characteristics of simple process, low preparation cost and the like, and the prepared aluminum nitride fiber can be used as a high-thermal-conductivity filler for electronic packaging.