846 results about "Silicon alloy" patented technology

The invention provides a pre-buried brazing flux aluminum alloy brazing filler metal plate blank and a preparation method thereof, a pre-buried brazing flux composite aluminum alloy brazing plate strip and a preparation process and application thereof. After the mixed powder of the aluminum-silicon alloy and the brazing flux is pressed into the cylinder, the cylinder is extruded into the aluminum alloy brazing filler metal plate blank with the pre-embedded brazing flux through the semi-continuous extruding machine, the production efficiency is high, the yield is high, and the prepared aluminum alloy brazing filler metal plate blank with the pre-embedded brazing flux is uniform in component and good in extensibility. The prepared pre-buried brazing flux aluminum alloy brazing filler metal plate blank and an aluminum alloy core material are easy to roll and compound, the obtained pre-buried brazing flux composite aluminum alloy brazing plate strip has a good compound interface, does not have obvious defects such as slag inclusion, bubbles, layering and peeling, has the mechanical property meeting the requirements, has excellent ductility and good brazing performance, and is suitable for large-scale production. And the brazing effect with other aluminum components is good, the surface of a workpiece is bright, and soldering flux traces are not left. The technology can greatly simplify the manufacturing process of the aluminum heat exchanger, and can be used for large-scale industrial production.

The invention discloses a method for manufacturing 7072 alloy high-performance air conditioner foil in a low-carbon, efficient and short-process mode, and relates to the technical field of aluminum foil machining. S2, continuous casting and rolling; s3, cold foil rolling; s4, finished product annealing; and S5, checking and packaging. Through component adjustment, iron and silicon alloy elements are controlled at the lower limit of the national standard, generation of coarse aluminum-iron-silicon phases is reduced, and low ductility caused by coarse grains after finished product annealing is avoided; in the cold foil rolling process, indexes of a working roll and rolling oil are adjusted, process parameters are optimized, the blank is directly rolled into a finished product, the direct rolling process is beneficial to improving the mechanical property of the finished product, and punching production of downstream customers is facilitated; and after triple continuous rolling is finished, subsequent cold foil rolling continuous rolling is rapidly arranged, deformation heat generated by triple continuous rolling and rolling of each pass is fully utilized, and large-machining-rate rolling of each pass is achieved.

The invention provides a manganese-silicon alloy and a production method thereof, and the production method comprises the following steps: respectively crushing a manganese-containing material, silica and coke in proportion, mixing with a dephosphorizing agent, adding a binder and a proper amount of water to prepare a premix, pressing the premix into smelted pellets, and drying; the dried smelting pellets are put into a closed electric furnace to be smelted, and alloy melt is obtained; 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; and 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. According to the method, the raw materials such as the manganese material, the silica, the coke and the dephosphorizing agent are crushed respectively and then mixed, briquetted and smelted, so that the dephosphorizing and desulfurizing effects can be improved, and sulfur in the alloy can be further removed by spraying magnesium powder outside the furnace for desulfurization, so that the quality of the manganese-silicon alloy is improved.

The invention provides a negative plate and a battery. The negative plate comprises a negative current collector and a coating, and the coating is divided into an inner layer and an outer layer; the inner layer is close to the surface of the negative current collector and the outer layer is away from the surface of the negative current collector; the first negative electrode active substance of the inner layer comprises a silicon-based negative electrode material, and the silicon-based negative electrode material comprises at least one of silicon oxide, silicon carbide, nano silicon and silicon alloy. The second negative electrode active material of the outer layer comprises a carbon negative electrode material, and the carbon negative electrode material comprises at least one of natural graphite, artificial graphite, hard carbon, soft carbon, mesocarbon microbeads and graphene. By adopting the specific double-layer active material layer structure, the performance of the negative electrode is effectively improved, and the energy density and the fast charging performance of the battery are improved. Meanwhile, due to the special multi-layer structural design, the volume expansion effect of the silicon-based negative electrode material can be effectively relieved, the structural stability of the negative electrode is optimized, the structural stability of the negative electrode can be kept for a long time in the charge-discharge cycle, and then the battery performance is optimized.

The invention relates to an aluminum-based composite material, in particular to a preparation method of an in-situ micro-nano Al2O3 particle reinforced aluminum-based composite material. The preparation method comprises the following steps: carrying out ball-milling pre-dispersion on silica powder, calcined kaolin and aluminum powder according to a specified ratio, stirring an Al-Si alloy melt at a semi-solid temperature, adding ball-milling mixed powder, heating to a temperature above an Al-Si alloy liquidus, dispersing reactant powder by using a blade-tray integrated stirring device, heating, carrying out heat preservation, carrying out heat preservation, and carrying out vacuum drying to obtain the aluminum-silicon alloy. And reacting to generate in-situ micro-nano Al2O3 particles, cooling, supplementing alloy elements, refining, and pouring to obtain the in-situ micro-nano Al2O3 particle reinforced composite material. According to the blade-tray integrated stirring device, mechanical stirring and the rolling and impacting effects of the ceramic balls are combined, the problem of one-time dispersion of micro-nano reactant powder is effectively solved, meanwhile, passivation of edges and corners of micron particles is achieved, and the comprehensive performance of in-situ particle reinforced aluminum matrix composites is improved.

The invention discloses coating type preformed brazing filler metal and a preparation method and application thereof, and belongs to the technical field of brazing, the coating type preformed brazing filler metal comprises brazing filler metal and brazing flux wrapping the periphery of the brazing filler metal, the brazing filler metal comprises aluminum-silicon alloy, and the brazing flux comprises fluoroaluminate; the mass ratio of the aluminum-silicon alloy to the fluoroaluminate is (75-96): (4-25). According to the method, the outer surface of the aluminum-silicon alloy is coated with the fluoroaluminate, the brazing flux can effectively remove an oxidation film on the surface of brazing filler metal and an oxidation film on a welding interface, the welding quality is improved, and then the product yield is improved.

The invention discloses a component global homogenized C / C-UHTCs composite material and a preparation method thereof.The preparation method comprises the steps that non-woven cloth is laid, then needling is conducted in the Z direction to obtain a carbon fiber preform, chemical vapor deposition is conducted on the carbon fiber preform to obtain a C / C composite material, molten salt infiltration treatment is conducted on the C / C composite material, a C / C-UHTCs porous body containing a UHTCs interface layer is obtained, and the C / C-UHTCs porous body containing the UHTCs interface layer is obtained; carrying out reactive infiltration treatment on the C / C-UHTCs porous body by adopting silicon-containing alloy powder to obtain a C / C-UHTCs composite material; the C / C-UHTCs composite material prepared by the preparation method provided by the invention has the advantages of extremely high density, extremely low porosity, no fiber damage, intact interface and uniformization of components, the mass ablation rate is a negative value after the C / C-UHTCs composite material is ablated by oxyacetylene flame at 2600 DEG C for 180s, and the C / C-UHTCs composite material has extremely excellent ablation resistance.

The invention discloses an ultrasonic vibration thermal aging treatment method and a high-performance aluminum-magnesium-silicon alloy material. Firstly, solution treatment and water-cooling quenching are carried out at the temperature of 555 DEG C, and then coupling treatment of ultrasonic vibration and thermal aging is carried out at the temperature of 150 DEG C; and under the combined action of ultrasonic vibration and a temperature field, precipitation of a beta ''phase is remarkably accelerated, proliferation and movement of dislocation are improved, grain refinement and microstructure optimization are promoted, and comprehensive improvement of the comprehensive mechanical property of the 6082 aluminum alloy is achieved within short aging. After the obtained high-performance 6082 aluminum alloy is treated for 1-3 hours, the hardness is improved to 120-125 HV, and the tensile strength is improved to 320-330 MPa. The ultrasonic aging vibration device comprises an ultrasonic generator, a transducer, an amplitude-change pole, a drying box, a fixed base and a fixed frame, efficient transmission of ultrasonic energy and stable vibration are ensured, and therefore the comprehensive mechanical property and machining quality of 6082 aluminum alloy are remarkably improved.

The invention relates to the technical field of metal alloy preparation and development, in particular to a high-toughness die-casting aluminum-silicon alloy material and a preparation method thereof. The aluminum-silicon alloy material comprises the following components in percentage by mass: 8.0% to 9.0% of Si, 0.2% to 0.3% of Mg, 0.6% to 0.7% of Mn, 0.1% to 3.0% of Cu, 0.10% to 0.18% of Ti, 0.01% to 0.03% of V, 0.05% to 0.35% of Zn, 0.02% to 0.04% of Sr, 0.01% to 0.02% of La, 0.01% to 0.02% of Ce, 0% to 0.1% of Fe, 0% to 0.004% of Na, 0% to 0.002% of B and the balance of Al. The aluminum-silicon alloy material provided by the invention has excellent tensile property, compression property and shearing property, and the comprehensive performance of the alloy material is improved.

The invention provides an amorphous copper nanolayer coated spherical porous silicon composite material and a preparation method and application thereof.The preparation method includes the step that the surface of spherical porous silicon is coated with an amorphous copper conductive nanolayer through a simple solution method.On the basis of the principle of replacement reaction, aluminum in aluminum-silicon alloy is replaced with copper to be coated on the surface of silicon, and the amorphous copper nanolayer coated spherical porous silicon composite material is obtained. And meanwhile, the rate of the replacement reaction is slowed down by utilizing different reaction activities of copper chloride in an organic solvent, so that the spherical morphology is kept, and meanwhile, the surface of silicon can be coated with a layer of amorphous copper nano layer with high conductivity. The invention also provides a preparation method of the material. Tests find that the conductivity of the material can be effectively improved due to the excellent conductivity of the copper nano layer, and the volume expansion effect of the material in the electrochemical cycle process can be effectively relieved due to the porous structure. Therefore, the combination of the two effectively improves the problems of poor conductivity and unstable structure of the silicon negative electrode material, and effectively improves the application performance of the silicon negative electrode material in the lithium ion battery negative electrode.

A package includes a bridging element (an OMIB), and first and second photonic paths, forming a bidirectional photonic path. The OMIB has first and second interconnect regions to connect with one or more dies. Third and fourth unidirectional photonic paths may couple between the first interconnect region and an optical interface (OI). A photonic transceiver has a first portion in the OMIB and a second portion in one of the dies. The first and the second portions may be coupled via an electrical interconnect less than 2 mm in length. The die includes compute elements around a central region, proximate to the second portion. The OMIB may include an electro-absorption modulator fabricated with germanium, silicon, an alloy of germanium, an alloy of silicon, a III-V material based on indium phosphide (InP), or a III-V material based on gallium arsenide (GaAs). The OMIB may include a temperature compensation for the modulator.

This invention discloses a non-heat treatable die-cast aluminum-silicon (Al—Si) alloy with high toughness and its preparation method. By controlling the Mn / Fe ratio to a specific value, the adverse effects of Fe in the alloy can be effectively suppressed. In addition, a certain proportion of rare earth elements are introduced into the alloy to effectively refine the Si and form high-temperature phases with elements such as Al and Cu, therefore improving the deformation resistance of the alloy when applied to one-piece die-cast large-scale structural parts. When taking specimens from the casting after die casting for testing, the specimens have the following properties: tensile strength 290 Mpa, yield strength 140 Mpa, and elongation 13%. The alloy also has excellent die-cast molding performance, and the energy used is clean, which meets low-carbon emission standards.

The invention discloses a modified silicon negative electrode material and a preparation method and application thereof, belongs to the technical field of all-solid-state batteries, and can compensate the active lithium loss of the whole battery, improve the cycle performance of the battery and relieve the volume change through negative electrode pre-lithiation. The method comprises the following steps: pressing silicon powder into blocks under a certain pressure; coating the blocky silicon and the cut lithium foil according to a certain proportion, grinding and mixing to obtain a precursor I; under the protection of inert gas, the precursor I is heated for the first time, and a powder precursor II is obtained; and grinding the precursor II, pressing the precursor II into blocks, heating the blocks in a vacuum or inert atmosphere to a preset temperature, and grinding the blocks to obtain the lithium-silicon alloy. The preparation process is simple, the silicon negative electrodes with different pre-lithiation degrees can be prepared by controlling the lithium addition amount, the cycling stability of the battery is improved, and the volume expansion of the electrode is relieved.

A seamless flux-cored wire for 10CrNiCu steel for ships, applied to welding of continuous casting 907A steel for a main hull and composed of a low-carbon steel sheath and a flux core. The diameter of the wire is 1.0-1.4 mm; the filling rate of flux-cored powder is 14%-16%; measured as the mass percentage of the flux-cored wire, the flux core contains rutile, aluminum oxide, ferroboron, zircon sand, quartz, bismuth oxide, potassium titanate, sodium fluoride, electrolytic manganese, ferrotitanium, magnesium powder, manganese-silicon alloy, nickel powder, metal chromium, copper powder, and iron powder. The seamless flux-cored wire for 10CrNiCu steel for ships has the advantages of good welding performance, stable mechanical properties, good crack resistance, low diffusion hydrogen content, high moisture absorption resistance, excellent rust resistance, and the like. Also provided is a method for manufacturing the seamless flux-cored wire for 10CrNiCu steel for ships

The invention discloses a method for preparing a lithium-copper composite negative electrode by utilizing lithium slag and application, and the preparation method of the negative electrode comprises the following steps: adding the lithium slag with certain concentration after removing impurities such as Ca < 2 + >, Mg < 2 + > and Fe < 3 + > through acid treatment into metal lithium in a molten state, and fully stirring until the reaction is complete; and coating the molten metal lithium obtained after the reaction on a current collector to obtain the modified lithium metal negative electrode plate. The prepared lithium-copper composite negative electrode has a lithium-loving 3D frame structure, volume expansion in the circulation process can be inhibited, lithium oxide, lithium aluminum alloy and lithium silicon alloy existing on the 3D frame structure can serve as lithium-loving sites for uniform lithium ion deposition, lithium dendrite growth is inhibited, and long-term stable circulation of the lithium metal negative electrode is promoted.

The present invention belongs to the technical field of battery materials, and relates to a carbon nanotube-enhanced carbon-coated porous silicon / alloy composite material and its preparation. The preparation method comprises: thermally nitriding nano magnesium silicon alloy powder, and then vacuum high temperature decomposing to obtain nano porous silicon powder; dispersing the nano silicon alloy powder in a citric acid aqueous solution, dispersing the nano silicon alloy powder, surfactant and sodium hydroxide in an aqueous solution, mixing and stirring the two solutions evenly, and drying to obtain a precursor; adding the precursor to softened asphalt, stirring evenly, and then rolling into a thin sheet by a roller press, cooling, crushing, and then high temperature carbonization, ball milling, sieving; and finally chemical vapor deposition. In the obtained carbon nanotube-enhanced carbon-coated porous silicon / alloy composite material, the carbon-coated nano porous silicon and the nano silicon alloy are connected by carbon nanotubes and evenly dispersed in the carbon-coated shell; it has excellent electrochemical properties as a negative electrode material.

The invention discloses a high-strength and high-conductivity copper-nickel-silicon alloy for a lead frame and a preparation method of the high-strength and high-conductivity copper-nickel-silicon alloy. The high-strength and high-conductivity copper-nickel-silicon alloy comprises the following components in percentage by mass: 1.75-1.86 wt% of Ni, 1.02-1.1 wt% of Co, 0.54-0.62 wt% of Si, 0.12-0.13 wt% of Mg, less than or equal to 1.0 wt% of Ag and the balance of Cu. The preparation method comprises the following steps: 1) preparing the raw materials according to the alloy components and the mass percentage content, and carrying out alloy casting by using a vacuum melting furnace; (2) the cast ingot is subjected to solution treatment and then rapidly water-cooled to the room temperature, so that the solid solution state of the alloy is reserved; the method comprises the following steps of (1) carrying out primary cold rolling on a cast ingot, (2) carrying out secondary cold rolling on the cast ingot, (3) carrying out hot rolling on the cast ingot after surface defects of the cast ingot are milled off, (4) carrying out primary cold rolling, annealing for 4 hours at the temperature of 420-440 DEG C, carrying out secondary cold rolling, annealing for 4 hours at the temperature of 310-330 DEG C, carrying out aging treatment until the thickness is 0.2 mm, carrying out tertiary aging treatment at the temperature of 100-400 DEG C for 2-20 hours, and carrying out air cooling to the room temperature. The highest tensile strength of the obtained copper alloy strip is 825 MPa, the highest yield strength is 790 MPa, the highest hardness is 252.9 HV, the highest electric conductivity is 46.17% IACS, and the highest elongation is 3.16%.

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 relates to the technical field of cast aluminum-silicon alloys, in particular to a low-cost ultrahigh-toughness cast aluminum-silicon alloy material and a preparation method thereof. The aluminum-silicon alloy material comprises the following components in percentage by weight: 7.0%-9.0% of silicon, 0.30%-0.50% of magnesium, 1.60%-2.00% of copper, less than or equal to 0.2% of zinc, less than or equal to 0.2% of iron, 0.20%-0.40% of manganese, less than or equal to 0.2% of chromium, 0.05%-0.3% of zirconium, 0.03%-0.2% of titanium, less than or equal to 0.04% of strontium and the balance of aluminum and other impurities. Wherein the total content of other impurities is less than or equal to 0.15%, and the content of a single impurity is less than or equal to 0.05%. The aluminum-silicon alloy material provided by the invention has relatively excellent comprehensive properties such as tensile strength and elongation and relatively low cost, and can replace traditional cast aluminum, deformed aluminum, medium-low grade ductile iron, gray iron, carbon steel, plates and other materials, so that the weight-reducing and light-weight design of parts is realized.

The invention discloses an additive manufacturing method for generating a nanoparticle strengthening phase through an aluminum-silicon alloy in-situ reaction, which is characterized in that reaction gases such as N2, C2H2 and the like are introduced in a selective laser melting additive forming process, the volume fraction of the reaction gases is greater than 50%, and the gases and metal are subjected to a combination reaction on the surface of a molten pool under the action of a high-energy laser beam, so that the surface of the metal is subjected to a nano-particle strengthening phase; and particles generated on the surface of the molten pool are dispersed into the molten pool under the violent stirring effect of the molten pool under the laser effect. After laser spots move, a molten pool is solidified, a certain volume fraction of nano-particles with a precipitation strengthening effect are produced in situ in a tissue, and the problems of generation of a coarse precipitation phase and unmelted particles and the like are solved. According to the method, various nano-sized reinforced phase particles can be generated in situ in the selective laser melting additive forming process, the particles are fine and are uniformly dispersed, the strengthening effect is good, and the mechanical property of the formed aluminum-silicon alloy can be remarkably improved.

The invention relates to the field of material science and mechanical engineering, in particular to a high-strength aluminum-magnesium-silicon material bolt for a new energy automobile and a preparation method of the high-strength aluminum-magnesium-silicon material bolt. The bolt is made of an aluminum-magnesium-silicon alloy, and the alloy contains magnesium, silicon, manganese, iron, chromium, titanium, scandium, rare earth elements and the balance of aluminum. By optimizing the proportion of rare earth elements (yttrium, lanthanum and cerium) and scandium, grains are effectively refined, the tensile strength, the yield strength and the ductility are improved, and meanwhile the corrosion resistance and the fatigue resistance are enhanced. The preparation method comprises the steps that vacuum melting is combined with the ultrasonic-assisted technology, alloy elements are evenly distributed, and then the material structure is optimized through solution treatment at the temperature of 540 DEG C for 1.5 h and aging treatment at the temperature of 160 DEG C for 8 h. And the surface of the bolt is subjected to anodic oxidation and coated with a composite coating containing silicon dioxide nanoparticles, so that the wear resistance and the corrosion resistance are improved. Through verification, the bolt has the excellent performance that the tensile strength is larger than or equal to 490 MPa, the yield strength is larger than or equal to 440 MPa, the ductility is larger than or equal to 8.5%, and the salt spray test time is larger than or equal to 1500 hours, and the fastening requirement of the new energy automobile under the complex working condition is met.

The invention provides natural color anodized aluminum alloy powder and a preparation method and application thereof, and belongs to the field of additive manufacturing. The method comprises the following steps: remelting an aluminum-silicon alloy and magnesium silicate to obtain an aluminum-magnesium-silicon alloy; a mixed raw material is prepared from an aluminum-magnesium-silicon alloy, pure magnesium, pure aluminum and an aluminum-zirconium alloy, and is formed based on ultrasonic suspension smelting and rapid cooling; the aluminum alloy powder comprises the following components in percentage by weight: 1.0-5.0% of Zr, 1.0-5.0% of Al, 1.0-5.0% of Zr, and the balance of aluminum. 0.4 to 1.0 wt% of Mg; 0.4 to 1.0 wt% of Si; the balance is Al and inevitable impurities; wherein the weight ratio of Si to Mg is 1: 1. The material can be used for additive manufacturing molded consumer electronics. According to the method disclosed by the invention, on the premise of reducing the types and the dosage of strengthening elements, the aluminum alloy which is uniform in structure, free of obvious segregation, isotropic in mechanical property, free of the problems of pits and layer lines after anodizing and free of color difference is prepared by adopting an ultrasonic suspension smelting and hypersonic inert gas atomization method.

The invention relates to the technical field of coatings, in particular to a coating suitable for niobium-silicon alloy surface high-temperature protection and a preparation method of the coating. The coating comprises the following raw materials in parts by weight: 100-120 parts of deionized water, 60-80 parts of nickel-chromium-aluminum-yttrium alloy powder, 60-80 parts of enamel glaze, 50-60 parts of filler, 20-40 parts of a binder, 10-20 parts of nano titanium dioxide and 6-10 parts of an additive. According to the invention, during preparation of the coating, through addition of the filler, the negative thermal expansion performance of zirconium tungstate in the filler and volume shrinkage of zirconium tungstate in a high-temperature state, a buffer space is provided for thermal expansion of other materials in the coating, cracks of the coating due to thermal stress are avoided, and the high-temperature resistance of the coating is improved; kH560 enhances the interfacial compatibility of zirconium tungstate, avoids agglomeration of zirconium tungstate, and enables the zirconium tungstate to be more uniformly distributed in a coating system.

The invention discloses a heat-resistant aluminum-based composite material and a selective laser melting forming preparation method and application thereof, and belongs to the technical field of metal material additive manufacturing. According to the method, aluminum-silicon alloy matrix powder and nano CuO powder are mixed to serve as cladding powder, Al2O3 and Al2Cu nano particles and precipitated phases which are evenly distributed are directly generated in matrix alloy through in-situ reaction of Al-CuO in a selective laser melting process under the action of high-energy laser, and an aluminum-silicon eutectic structure can be refined to 200-300 nm. Cooperative strengthening of multiple precipitated phases and multiple interfaces is achieved, and the problems of coarse precipitated phases, unmelted particles and the like generated by traditional alloying methods and the like are solved. According to the method, the high-temperature mechanical property of the selective laser melting forming aluminum-based composite material can be remarkably improved. The prepared composite material is suitable for high-temperature light-weight components such as aerospace and nuclear energy equipment, and has a wide application prospect.

The present invention discloses a preparation method and use of an Al2O3-Al composite packaging material, and the preparation method comprises the following steps: step A: uniformly mixing aluminum powder, aluminum oxide powder, CuO-TiO2 powder and ceramic particle additive powder to obtain a mixed raw material A; step B: adding a polyvinyl alcohol aqueous solution to the mixed raw material A and grinding it fully to obtain a mixed raw material B; step C: placing the mixed raw material B in a ball mill for ball milling, and obtaining a mixed raw material C after the ball milling is completed; step D: cold-pressing the mixed raw material C to obtain a prefabricated block; step E: placing the prefabricated block in a resistance furnace for sintering, and cooling it to room temperature with the furnace after the sintering is completed, to obtain an Al2O3-Al composite packaging material. The composite packaging material is used to encapsulate an aluminum-silicon alloy phase change heat storage material. The composite packaging material prepared by the present invention can be used to encapsulate an aluminum-silicon alloy phase change heat storage material, and has the advantages of good corrosion resistance and not easy to leak.

The present invention discloses a method for preparing a lithium-silicon alloy nanoparticle and a dry-process lithium-silicon alloy negative electrode material. The lithium-silicon alloy nanoparticle comprises a lithium-silicon alloy core and a polymer layer located on the surface of the lithium-silicon alloy core, wherein the polymer layer completely covers the lithium-silicon alloy core. By fully covering the silicon-lithium alloy core with a polymer, the stability of the lithium-silicon alloy particles can be improved, the equipment investment cost can be reduced, and the economy can be improved. Moreover, when the silicon-lithium alloy particles are used with other raw materials such as a conductive agent to prepare a negative electrode material, the reaction between the silicon-lithium alloy core inside the silicon-lithium alloy particles and water and oxygen in the external air can be effectively avoided, thereby reducing lithium loss. In addition, adding a stabilizer during the mixing process of preparing a dry-process lithium-silicon alloy negative electrode material can supplement the polymer-free vacancies that appear after the surface coating layer of the silicon-lithium alloy particles is worn, further preventing the reaction between the internal silicon-lithium alloy and the external air, reducing lithium loss, and thus improving material performance.

The invention relates to an aluminum-silicon alloy and a die-casting process thereof. The die-casting process of the aluminum-silicon alloy comprises the following steps: melting alloy raw materials, degassing and refining, carrying out semi-solid pulping, adding a refiner in the semi-solid pulping process, stirring, reducing the temperature of a semi-solid alloy melt, and continuously stirring, so as to realize primary refinement and modification of primary crystal grains and broken dendrites formed in the semi-solid slurry; a semi-solid alloy melt is obtained; and chilling, solidifying and forming the semi-solid alloy melt, and quenching to obtain the aluminum-silicon alloy casting. The invention further provides the aluminum-silicon alloy prepared through the die-casting technology. The problem that an existing refiner cannot meet the good refining effect and the good modification effect at the same time is solved, and the problems that an existing aluminum-silicon alloy die casting is thick in structure and poor in tensile property are further solved.

The invention discloses an alloy negative electrode of a solid-state battery and a preparation method of the alloy negative electrode, and belongs to the technical field of all-solid-state batteries, and the prepared alloy negative electrode can effectively improve the utilization rate of an active material, enhance the conductivity of a negative electrode material and reduce electrode polarization. The method comprises the following steps: pre-lithiating silicon powder to obtain lithium-silicon alloy powder A; mixing the conductive carbon B and the conductive carbon C, and performing ball milling to obtain mixed powder D; the lithium-silicon alloy powder A and the mixed powder D are mixed and subjected to ball milling, and mixed powder E is obtained; and adding an electrolyte into the powder E, mixing, and carrying out ball milling to obtain the alloy negative electrode material. The lithium ion battery assembled by adopting the alloy negative electrode has high first-circle coulombic efficiency, high charge-discharge capacity and excellent battery cycle stability.

A Si alloy powder for a negative electrode, the Si alloy powder including: a Si phase; a SiX compound phase; and at least one selected from the group consisting of a SnY compound phase and a AlY compound phase, in which the element Y in the SnY compound phase and the AlY compound phase includes at least one element selected from the group consisting of Cu, Fe, Ni, Cr, Co, Mn, Zr, and Ti, the Si alloy powder has an average particle diameter of 30 μm or less, and an amount of the Si phase in an entire Si alloy is 30 mass % to 95 mass %.

The invention relates to a silicon-carbon composite material, a preparation method and application thereof, and a battery. The silicon-carbon composite material comprises: a porous carbon matrix; the metal coating is positioned on the hole wall of the porous carbon substrate; the silicon alloy particles are positioned on the surface of the metal coating; the amorphous silicon particles grow along the epitaxy of the silicon alloy particles; and a carbon coating layer, wherein the carbon coating layer is located at the outer layer. The silicon-carbon composite material disclosed by the invention has excellent conductivity and structural stability, and the battery adopting the silicon-carbon composite material can realize high mass specific capacity and excellent high-temperature and low-temperature cycling stability.