658 results about "Al powder" patented technology

The invention discloses medium-entropy MAB-phase ceramic powder and a preparation method thereof, and belongs to the technical field of ceramic material preparation. The chemical formula of the ceramic powder is (Cr1 / 3Mn1 / 3Fe1 / 3) 2AlB2, and the ceramic powder is structurally characterized in that three transition metal atoms of Cr, Mn and Fe are in random solid solution distribution at an M position. The preparation method of the material comprises the following steps: taking Cr powder, Mn powder, Fe powder, Al powder and B powder as raw materials, burdening according to a stoichiometric molar ratio in a chemical formula (Cr1 / 3Mn1 / 3Fe1 / 3) 2AlxB2 (wherein x is equal to 1.0-1.3), uniformly mixing, and sintering in a non-pressure tube furnace by adopting a two-stage heating sintering process. And crushing, drying and sieving the sintered product to obtain the ceramic powder. According to the invention, excessive aluminum powder is added to compensate high-temperature volatilization, and a two-stage sintering process is combined, so that the generation of an impurity phase is effectively inhibited, and a high-purity target product is successfully prepared. The synthesis method is simple in process, low in equipment requirement and suitable for large-scale production, and a material basis is provided for application of the medium-entropy MAB phase ceramic in the fields of electromagnetic functions, high-temperature environments and the like.

A high thermal conductive silicone composition including: (A) an organopolysiloxane having at least two aliphatic unsaturated hydrocarbon groups in one molecule and a kinematic viscosity at 25 C of 100 to 100,000 mm2 / s; (B) an aluminum powder having an average particle size of 50 μm or more; (C) a thermal conductive filler having an average particle size of 0.1 to less than 50 μm; (D) an organohydrogenpolysiloxane having two or more hydrogen atoms bonded to a silicon atom (Si—H groups) in one molecule; (E) a hydrolyzable organopolysiloxane represented by the following general formula (1); and (F) a platinum group metal catalyst having an effective amount. The high thermal conductive silicone composition can conform to the warpage of a substrate due to an increased material thickness and can maintain heat dissipation performance due to a high thermal conductivity.

This invention discloses an Al-Ti-C-Ce master alloy using titanium carbide as both Ti and C sources, its preparation method, and its application. Titanium carbide powder is mixed with aluminum powder and ball-milled to obtain an Al-coated TiC core-shell composite powder. The core-shell composite powder is pressed into preforms. These preforms are then pressed into the bottom of molten aluminum in batches using graphite bell jars. The mixture is first held at 760-850℃, then cooled to 700-750℃. An Al-30Ce master alloy is then added, followed by a second holding period. The mixture is then slag-removed and refined, and finally cast into a mold to obtain the Al-Ti-C-Ce master alloy. The Al-Ti-C-Ce master alloy provided by this invention refines the grain size of A356 alloy to 106 μm (ASTM grade 5), and even in low-content systems, a grain size refinement level of less than 120 μm can be maintained.

The invention belongs to the technical field of electrode material preparation, and particularly relates to a preparation method of boric acid-assisted low-temperature sintered porous aluminum foil. The preparation method comprises the following steps: dispersing aluminum powder, boric acid and binder raw materials in a solvent to form dispersed slurry; and coating a matrix with the dispersed slurry, drying, sintering at 450-600 DEG C under protective gas, reacting boric acid with aluminum oxide on the surface of the aluminum powder to form low-melting-point aluminoborate, reducing the sintering temperature, promoting aluminum atom diffusion, increasing sintering neck formation, and sintering to obtain the porous aluminum foil. Boron oxide generated by decomposition of boric acid is added to react with aluminum oxide to form low-melting-point aluminoborate, the sintering liquidus temperature is reduced, aluminum atom diffusion is promoted, and low-temperature sintering at 450-600 DEG C is achieved. The aluminum powder sintered foil is suitable for energy storage devices such as an aluminum electrolytic capacitor and a lithium ion battery, has the advantages of low-temperature energy conservation, high porosity and strong mechanical property, and solves the problems of aluminum oxide obstruction and high high-temperature energy consumption of the traditional aluminum powder sintered foil.

The invention discloses a preparation method of a high-strength low-resistance functional aluminum current collector, and relates to the technical field of lithium battery manufacturing. The preparation method of the functional aluminum current collector comprises the following steps: adding water into a binder for dispersion, adding aluminum powder and a dispersing agent for high-pressure homogeneous dispersion, adding conductive carbon black and graphite step by step, stirring to obtain carbon-coated slurry, coating the carbon-coated slurry on a tab blank area of the current collector and a welding surface, in contact with the current collector, of an adapter foil, and carrying out vacuum drying to obtain the functional aluminum current collector. And finally, the functional aluminum current collector is prepared through ultrasonic welding. The functional aluminum current collector prepared by the invention has the characteristics of high strength and low resistance, solves the problems of high resistance and low welding strength of the traditional functional aluminum current collector, and is suitable for manufacturing high-performance lithium batteries.

The invention discloses a high-performance gamma-based titanium-aluminum alloy and an additive manufacturing method thereof. The additive manufacturing method comprises the following steps: selecting proper titanium-aluminum alloy powder and aluminum powder; mixing the titanium-aluminum alloy powder with aluminum powder to obtain mixed powder; the mixed powder is fed into SLM equipment, printing is carried out in the inert gas protection atmosphere, a printing-state alloy blank with the density larger than or equal to 97% is obtained, and at the moment, a mixed structure of a titanium-aluminum intermetallic compound and an aluminum phase is preliminarily formed in the blank; the printed alloy blank is placed in hot isostatic pressing equipment to be subjected to hot isostatic pressing treatment; and the alloy subjected to hot isostatic pressing treatment is subjected to solid solution heat treatment. According to the method, the synergistic problem of SLM forming-defect elimination-phase regulation and control is broken through, the process chain is optimized, the gamma-phase dominated high performance is guaranteed, meanwhile, the process simplicity and cost advantages are achieved, the method is the optimal scheme for solving the titanium-aluminum additive manufacturing bottleneck at present, and the use requirement of the low-pressure turbine blade of the aero-engine is met.

The invention discloses a method for recovering and repairing positive and negative electrode materials of a lithium ion battery, which comprises the following steps of: crushing a waste lithium ion battery into sheets, volatilizing electrolyte through low-temperature heat treatment, and screening out an aluminum shell and a diaphragm through winnowing to obtain a positive and negative electrode sheet mixture; performing color sorting on the positive and negative electrode plate mixture through a color sorter, and separating to obtain a positive electrode plate and a negative electrode plate; sintering the positive plate for the first time to volatilize the binder, and then sintering for the second time to complete repair to obtain a positive electrode material and aluminum powder; and repairing the negative plate directly through one-time sintering to obtain a negative electrode material and copper powder. According to the method, separation, recovery and repair of the positive and negative electrode materials in the waste lithium ion battery are directly realized through crushing, low-temperature heat treatment, winnowing, color sorting and sintering, the positive and negative electrode materials are high in recovery rate and low in impurity content, and the positive and negative electrode materials in the waste lithium ion battery can recover or even exceed the original performance through accurate repair.

The invention relates to the field of photovoltaic technology, in particular to a solar cell and a preparation process thereof, a laminated cell and a photovoltaic module. The preparation process comprises the following steps: providing a silicon substrate, and preparing a passivation layer on the surface of the silicon substrate; printing a conductive material on the passivation layer; sintering and curing the conductive material to form an initial grid line; performing laser processing on the initial grid line; wherein the conductive material comprises metal powder, glass powder, an organic carrier, iridium oxide, lanthanum oxide and titanium dioxide; the metal powder comprises at least one of silver powder, nickel powder, copper powder, silver coated copper, silver coated nickel and aluminum powder. The iridium oxide, the lanthanum oxide and the titanium dioxide are simultaneously added into the conductive material adopted in the preparation process, so that the power attenuation of the module is reduced.

The invention belongs to the technical field of soft magnetic materials, and particularly relates to a high-permeability low-loss FeSiAl magnetic powder core and a preparation method and application thereof. The preparation method comprises the following steps: (1) uniformly mixing pure Al powder with organic silica sol, an aluminate coupling agent, a lubricant and an organic binder to obtain coated bonding slurry; and (2) uniformly mixing FeSiAl soft magnetic powder with the coating and bonding slurry obtained in the step (1), carrying out hot-pressing curing molding at the temperature of 60-100 DEG C under a vacuum condition, and then carrying out hot-pressing sintering treatment at the temperature of 750-1000 DEG C under an oxygen-containing atmosphere condition to obtain the FeSiAl magnetic powder core with high magnetic conductivity and low loss. The FeSiAl soft magnetic powder is subjected to insulation coating and bonding treatment by adopting the coating and bonding slurry with specific composition, the high-frequency loss of the obtained magnetic powder core can be reduced by combining a specific treatment process, and the influence on the magnetic conductivity is relatively small.

The invention discloses a light-emitting diode packaging material and a preparation method thereof, and relates to the technical field of light-emitting diodes. The method comprises the following steps: adding 4, 4 '-diaminodiphenyl ether into pyromellitic dianhydride for condensation polymerization to obtain a polyamic acid solution, and adding zinc borate nanowires and aluminum nitride powder to prepare an inorganic skeleton enhanced polyamic acid suspension; the preparation method comprises the following steps: reacting zirconium hydroxide sol with an aluminum sec-butoxide solution, and carrying out hydrothermal reaction and high-temperature calcination to obtain ZrO2at-alpha-Al2O3 core-shell particles; the preparation method comprises the following steps: pre-polymerizing 4, 4 '-diphenylmethane bismaleimide and bisphenol A cyanate ester to obtain a prepolymer; the preparation method comprises the following steps: mixing bisphenol A type epoxy resin, inorganic skeleton reinforced polyamide acid suspension, ZrO2at-alpha-Al2O3 core-shell particles and a prepolymer under vacuum, defoaming, injecting into a mold, heating, curing, cooling and demolding to obtain the product. Through the synergistic effect of triple modification, the high temperature resistance and lasting thermal stability of the packaging material are improved, and the packaging material is suitable for the field of light emitting diode packaging with high temperature resistance requirements.

The present invention discloses an electroslag remelting method for reducing vanadium burnout. The vanadium content of the consumable electrode is controlled to be above the upper limit of the target composition of the electroslag blank, and is controlled to exceed the target composition upper limit by 5% to 10%. The surface-treated consumable electrode is coated with, from the inside out, an aluminum powder layer and / or a vanadium monoxide powder layer, and a corundum powder layer. During the electroslag remelting stage, electroslag is added to the crystallizer, and the average thickness of the slag pool is controlled to be 1 / 3 to 1 / 2 of the equivalent diameter of the consumable electrode being melted. At the same time, inert gas is blown into the crystallizer at a flow rate of 5 to 20 L / min. During the feeding stage, electroslag is again added to the crystallizer, and the thickness of the slag pool is controlled to be 1 / 2 to 1.0 of the equivalent diameter of the consumable electrode being melted. The inert gas flow rate is controlled at 10 to 30 L / min. By spraying the surface of the consumable electrode, the present invention effectively prevents secondary oxidation of the vanadium element in the consumable electrode during the electroslag remelting process, thereby reducing vanadium burnout and solving the problem of poor control stability of the burnout rate of the easily oxidized element vanadium.

The invention discloses a battery thermal runaway self-inhibition coating based on a heat absorption type reverse thermit reaction as well as a preparation method and application thereof. The battery thermal runaway self-inhibition coating comprises the following raw materials in percentage by weight: 40-60% of Fe2O3, 15-25% of Al powder, 20-35% of a heat absorption additive, 5-10% of a binder and 0-5% of a trigger regulator, the heat absorption additive is Bi2O3 or SrCO3; the binder is a potassium silicate aqueous solution or high-temperature-resistant polysiloxane resin; the trigger regulator is copper oxide or manganese dioxide. The coating is not a single functional material, but is a'reaction system ', an thermit reaction is converted into an endothermic reaction by introducing an endothermic additive, and a product of the coating can be fused and sintered in situ to generate a compact porous ceramic-metal composite heat insulation layer during the endothermic reaction, so that a battery cell can be isolated in space, and the performance of the battery cell is improved. And heat radiation can be effectively blocked due to low heat conductivity, so that double insurance of heat absorption and isolation is realized.

The invention provides a production method of a vanadium-aluminum alloy. The production method comprises the following steps: treating raw materials; the high-purity calcium fluoride is dried; lime and water are mixed according to the proportion of 1: 1, and the mixture is put into a drying box to be dried; the preparation method comprises the following steps: proportioning the following raw materials: vanadium pentoxide, aluminum powder and calcium fluoride according to the ratio of 1: (0.58-0.68): (0.02-0.13), proportioning the calcium fluoride according to the unit reaction heat of 3100-3150 KJ / kg, and uniformly mixing; filling the mixture into a reaction furnace body, compacting, and spreading an ignition agent on the material; ignition reaction; after the reaction is finished, standing the furnace body for 24 hours, moving out the furnace body, naturally cooling for 48 hours, and discharging from the furnace; the method mainly solves the problems of high alloy carbon content caused by graphite falling of the alloy graphite crucible and oxidation film and nitride film phenomena caused by metal solidification cracks.

The invention provides functional additive slurry, low-temperature curing copper slurry of an N-type TOPCon solar cell, an electrode and a preparation method, and belongs to the technical field of solar cells. The functional additive slurry comprises 50-90 parts by mass of an organic carrier; 0.1-30 parts by mass of a functional additive; the functional additive comprises at least one of magnesium powder, silicon powder, lead powder, graphite, carbon black, tin-bismuth alloy, gallium, iron powder, vitamin C and aluminum powder; 0.1-10 parts by mass of a dispersant; and 5-40 parts by mass of a solvent. When the functional additive slurry is used in the copper slurry, the copper powder can be uniformly dispersed, and the copper powder is not easy to oxidize in the printing and curing process, so that the resistance is reduced.

The invention discloses a method for producing martensite heat-resistant steel G115 for an ultra-supercritical power station based on electroslag remelting. The method comprises the following steps that S1, an electrode bar is obtained through EAF electric furnace smelting, LF refining, VD vacuum treatment and electrode die casting; s2, the electrode bar is subjected to electroslag remelting to obtain an electroslag ingot, a CaF2-Al2O3-CaO ternary slag system is adopted in the electroslag remelting process, Al powder, Si-Ca powder and B-Fe powder are added into the slag system, and argon protection is adopted in the whole process; and S3, after the electroslag ingot is demolded, annealing treatment is conducted. Smelting is conducted through the EAF electric furnace smelting technology, the LF refining technology, the VD vacuum treatment technology, the electrode die casting technology and the electroslag remelting technology, the problems of precise control over the easily-burnt element B and the gas content N and solidification structure segregation are solved, the product performance is further improved, and the welding process window is improved.

The invention relates to a preparation method of a high-hardness composite coating on a titanium alloy surface, which comprises the following steps: pretreating a titanium alloy base material to remove a surface oxide layer to obtain the treated titanium alloy base material; prepared high-entropy alloy powder is dried and evenly laid on the surface of the treated titanium alloy base material, and the titanium alloy base material with the powder laid is obtained; performing laser cladding treatment on the titanium alloy base material subjected to powder laying in a protective gas atmosphere to obtain a high-entropy alloy strengthened coating; the particle size of the powder is controlled to be 65-90 microns. The Al powder, the Co powder, the Ni powder, the Ti powder and the B powder with the purity higher than 99.5 wt% are selected as raw materials, the high-entropy alloy powder and the high-strength titanium alloy matrix are molten on the surface of the high-strength titanium alloy through a laser high-energy heat source, the metallurgical bonding effect is achieved, high-entropy phase strengthening is achieved, grains can be fine, and the hardness and abrasion resistance of a surface coating can be improved. The surface hardness of the coating prepared by laser cladding of the high-entropy alloy powder on the surface of the titanium alloy is not lower than 677 HV, and the wear resistance is not lower than 1.128 hmm.

The invention provides a MoAlB-SiC composite material as well as a preparation method and application thereof, and belongs to the technical field of ceramic matrix composite materials. The preparation method of the composite material comprises the following steps: mixing Mo powder, Al powder and B powder according to a molar ratio of 1: (1-2): 1, carrying out wet ball milling, drying, and carrying out vacuum pressureless sintering to obtain MoAlB powder; and S2, adding SiC particles with the mass percentage of 5%-20% into the MoAlB powder obtained in the step S1, carrying out wet ball milling, drying, and carrying out electric field assisted direct current heating rapid hot pressed sintering to obtain the MoAlB-SiC composite material. The MoAlB-SiC composite material obtained through the preparation method is high in density, secondary phases are reduced, the mechanical performance and the high-temperature oxidation resistance of the MoAlB material are enhanced by adding SiC, and the preparation method has great significance for preparing the high-strength MoAlB-based ceramic composite material.

The invention belongs to the technical field of electronic materials, and particularly relates to a high-performance sintered foil matched with multi-particle-size aluminum powder for industrial production and a preparation method of the high-performance sintered foil. In order to solve the problem that an existing sintered foil cannot obtain high bending performance and high specific capacitance performance at the same time, a multi-particle-size aluminum powder gradient matching strategy is adopted, the aluminum foil is prepared through slurry preparation, slurry stirring, double-face coating and drying integrated operation, sintering and formation treatment, the specific capacitance of the sintered foil after standardization is 0.8-1.2 mu F / cm, and the specific capacitance of the aluminum foil is 0.8-1.2 mu F / cm. The specific capacitance fluctuation range is smaller than or equal to 8%, the bending frequency is 40-100 times after a 90-degree bending test, the bent film layer is free of cracking and falling off, the leakage current is smaller than or equal to 3 [mu] A / cm < 2 > under the 25 DEG C and rated voltage test, and the film can be directly used for industrial production.

A NiTi / Al-based composite material with a dual heterogeneous structure, its preparation method, and its applications. This invention belongs to the field of NiTi / Al-based composite materials. The purpose of this invention is to solve the technical problem of existing NiTi / Al composite materials that cannot simultaneously achieve both strength and toughness. The method of this invention involves: firstly, mixing NiTi with pure aluminum powder through high-energy ball milling; then, mixing NiTi with aluminum alloy powder through high-energy ball milling; next, layering the two mixed powders and unmilled aluminum powder in a mold, and finally performing SPS sintering and low-temperature hot extrusion. The dual heterogeneous structure material prepared by this invention forms different crystalline regions with hard regions of high-density particles and tough regions without particles in the matrix, forming a brick-like layered structure heterogeneous structure through stacking. The method of this invention can also be used to prepare NiTi / reinforced composite materials of other metal matrices. The resulting composite material possesses both high strength and toughness, and can be applied in aerospace and automotive engineering fields.

The application provides a kind of core-shell structure quaternary energetic material and its preparation method and application, wherein the preparation method comprises the following specific steps: S1: nano magnesium powder and potassium nitrate powder are dissolved in organic solvent in turn, and Mg / KNO3 energetic slurry is obtained by heating and stirring;S2: nano aluminum powder and PTFE powder are treated by ultrasonic to obtain metastable mixed powder, then the metastable mixed powder is added to the prepared polymer binder, and Al / PTFE metastable composite slurry is obtained by heating, stirring and evaporation treatment;S3: the Mg / KNO3 energetic slurry obtained in S1 and the Al / PTFE metastable composite slurry obtained in S2 are added to two different barrels of 3D printer respectively, the equipment parameters of 3D printer are adjusted, and the Al / PTFE / Mg / KNO3 quaternary energetic material with core-shell structure is processed.The quaternary energetic material of the application can reduce the ignition temperature of the existing composite system material, further reduce the carbon residue formed after combustion, and the processing technology is simple, which can meet the personalized forming demand.

The invention provides a preparation method of a high-wear-resistance alloy lining plate, and relates to the technical field of wear-resistance alloys, carbon steel and pig iron are mixed, heated and melted, high-carbon ferromanganese, medium-carbon ferrochrome and ferrosilicon are added, heating refining is carried out, aluminum powder is added, the mixture is put into a mold, cooling and demolding are carried out, heating homogenization, quenching and cooling are carried out, and a mother plate is prepared; mixing bismaleimide, the composite powder and sepiolite fibers, heating and stirring, coating a mother board with the mixture, firstly applying negative pressure, then applying positive pressure, heating and cooling to obtain a substrate layer; and placing the mother board in magnetron sputtering equipment, sputtering on the substrate layer to obtain a chromium nitride functional layer, and cooling to obtain the high-wear-resistance alloy lining board. The composite powder is prepared by mixing and heating chromium carbide powder and a hydrogen peroxide solution, filtering, mixing with an ethanol solution and gamma-aminopropyltriethoxysilane, heating, condensing and refluxing, washing and drying, and mixing and heating with amine-terminated polyether and N, N-dimethylformamide. The wear-resistant stability of the alloy lining plate can be improved.

This invention provides a low-warpage composite PC reinforced material and its preparation method, relating to the field of composite material technology. The preparation method includes: mixing polycarbonate, polysiloxane-PC copolymer, aramid pulp-resin blend, and silica-alumina powder to obtain a first mixture; adding additives to the first mixture and mixing again to obtain a second mixture; feeding the second mixture and glass fiber into a twin-screw extruder for melt extrusion, cooling, and pelletizing to obtain the composite PC modified material. The composite PC modified material obtained by this method exhibits high strength and strong dimensional stability, and is less prone to warping when manufactured into products, making it widely applicable in products such as mobile phone lens holders.

This invention proposes a simulation material for mechanical testing of press-loaded explosives, which, by weight, is made from the following raw materials: 65.5% ammonium sulfate, 27%–33% aluminum powder, 1.5%–4% microcrystalline wax, 1%–2% butadiene rubber, and 0.2%–0.8% graphite. The compressive and tensile strengths of the explosive charge formed by this simulation material are essentially consistent with those of the charge charge formed from polyaluminum black-2 (JHL-2) explosive. It can realistically reflect the trend and limit of strength changes during mechanical testing, and provides effective reference data for mechanical performance evaluation. It also provides relatively realistic and reasonable model parameters for the digital design of the mechanical properties of press-loaded explosives. In aging tests, tensile tests, mechanical compression tests, and dynamic Brazilian tests, using this simulation material avoids contact with energetic explosive components, increasing test safety and reducing safety hazards.

The invention discloses a Ti / Al alloy laminated composite board and a preparation method thereof, and belongs to the technical field of titanium-aluminum alloy powder metallurgy. The preparation method comprises the following steps: (1) pre-pressing: alternately and uniformly laying aluminum powder and sponge titanium powder to form an aluminum powder layer and a sponge titanium powder layer, and compacting every time the laying of one layer of powder is completed to obtain a layered powder blank; (2) carrying out two-stage cold isostatic pressing treatment on the layered powder blank to obtain a composite board blank; and (3) carrying out multi-pass hot rolling on the composite board blank under the protection of inert atmosphere to obtain the Ti / Al alloy laminated composite board. Through the three-stage process of pre-pressing, two-stage cold isostatic pressing and controlled hot rolling, a wavy interlocking structure is formed, the synergistic effect is effectively utilized, the energy absorption capacity, the interface bearing capacity and the anti-shearing performance of the composite board are improved, grains are effectively refined, the harmful phase change probability is reduced, the interlayer interface bonding quality is improved, and the service life of the composite board is prolonged. Therefore, the room-temperature plasticity and fracture toughness of the composite board are optimized.

The application relates to the technical field of lithium iron phosphate battery recycling, in particular to a method for recycling waste lithium iron phosphate battery materials. Specifically, after the waste lithium iron phosphate battery is discharged, the battery is disassembled and separated under an inert atmosphere, and the battery is separately collected; the battery is mechanically pulverized after high-temperature calcination, and lithium iron phosphate coarse powder, copper powder and aluminum powder are obtained through vibration screening; the lithium iron phosphate coarse powder is added into an acid solution for leaching, the acid leaching solution is adsorbed and impurity-removed through metal impurity adsorption resin, and then lithium carbonate, ammonium dihydrogen phosphate and ferrous oxalate are added; after uniform stirring, drying, ball milling and roasting, lithium iron phosphate powder is obtained. The metal impurity adsorption resin has good complexing and stabilizing effects on various metal ions, so that the high purity of the lithium iron phosphate is ensured, and comprehensive resource utilization of the waste lithium iron phosphate battery is realized.

The embodiment of the present application provides a kind of N type TOPCon cell front silver aluminum paste and its preparation method and cell, wherein, the N type TOPCon cell front silver aluminum paste provided in the embodiment of the present application includes aluminum powder, silver powder, nano alloy powder, organic binder, glass powder and organic additive, wherein the nano alloy powder is one or more of nano silver aluminum alloy powder, nano aluminum boron alloy powder and nano aluminum silicon alloy powder.In nano silver aluminum alloy powder, nano aluminum boron alloy powder and nano aluminum silicon alloy powder, all have the characteristics of nano size particle size, high tap density, low oxygen content and high activity, so that the front silver aluminum paste added with the nano alloy powder can quickly form a good alloy with silicon at a lower sintering temperature, reduce the contact resistivity of front silver aluminum fine grid and cell, not only avoid the appearance of top needle print during EL test, but also improve the filling of cell and the efficiency of cell.

The invention provides a low-warpage composite PC reinforced material and a preparation method thereof, and relates to the technical field of composite materials. The preparation method comprises the following steps: stirring and mixing polycarbonate, a polysiloxane-PC copolymer, a polysulfonamide pulp-resin blend and silicon aluminum powder to obtain a first mixture; adding an auxiliary agent into the first mixture, and stirring and mixing to obtain a second mixture; and putting the second mixture and the glass fiber into a double-screw extruder, performing melt extrusion, cooling and pelletizing to obtain the composite PC modified material. The composite PC modified material obtained by the method is high in strength and high in dimensional stability, is not easy to warp when being prepared into a product, and can be widely applied to products such as a mobile phone lens bracket and the like.

The application discloses a silicon-aluminum target material and a preparation method thereof, and belongs to the technical field of target material preparation.The preparation method of the silicon-aluminum target material is different from the prior art, wherein the silicon powder and the aluminum powder are subjected to specific pretreatment to obtain a uniform silicon-aluminum alloy, and then the silicon-aluminum alloy is crushed into powder to be subjected to plasma spraying to finally obtain the silicon-aluminum target material.The product has low requirements on equipment, can realize scale production, and effectively solves the problems of aluminum element loss and uneven distribution in the preparation of the silicon-aluminum target material by the plasma spraying, and the aluminum element distribution error of different sites of the silicon-aluminum target material is only 0.2 wt%.

The application discloses a ladle heat-insulating high-strength light-weight castable which is prepared from the following raw materials in percentage by mass: 45-60% of mullite hollow spheres, 5-10% of expanded perlite, 5-10% of polycrystalline mullite fiber, 5-10% of magnesium oxide fine powder, 1-5% of aluminum powder, 1-5% of binding clay, 2-8% of rho-Al2O3 micro powder, 1-5% of sodium lignosulfonate, and 1-4% of SiO2 micro powder. The castable provided by the application has high strength, low thermal conductivity and good thermal shock resistance, can be used for ladle permanent layer castable, can effectively reduce the temperature of a ladle shell, plays a ladle heat-insulating role, can reduce the temperature of molten steel when a converter is tapped, reduces energy consumption, and reduces the cost per ton of steel.

This utility model relates to the field of packaging equipment and discloses an automatic air-blowing cleaning device for packaging equipment. The device includes an air source, a solenoid valve, a flow regulating valve, an intermediate relay, a sensor, an air supply pipeline, and an air-blowing nozzle. The air inlet of the solenoid valve is connected to the air source via the air supply pipeline, and the air outlet is connected to the flow regulating valve, which in turn is connected to the air-blowing nozzle, enabling targeted cleaning of specific areas. The solenoid valve receives signals from the sensor via the intermediate relay to control its opening and closing. The sensor is located at the end of the stroke of the pressure head or platen of the packaging equipment to detect the operational status in real time. This device automatically starts the air-blowing action after the pressure head or platen completes the pressing operation, promptly removing aluminum powder, debris, and other foreign objects from the equipment base or track surface. This effectively prevents foreign object accumulation from causing scratches or dents on the product, improving the yield of finished products, extending the service life of the equipment, and demonstrating good automation and practicality.