920 results about "Aluminum composites" patented technology

The invention relates to a copper-aluminum composite heat dissipation plate forging and pressing manufacturing process and a copper-aluminum composite heat dissipation plate. The process comprises the steps that S1, assembling is conducted, specifically, an aluminum plate and a copper plate are stacked, and a double-layer plate is obtained; s2, welding is conducted, specifically, the aluminum plate and the copper plate are compounded in a diffusion welding mode, the junction position of the aluminum plate and the copper plate is welded to form a diffusion layer, and a double-layer welded plate is obtained; the double-layer welding plate is extruded and stretched through a hydraulic machine to form the copper-aluminum composite heat dissipation plate, forming holes are formed in a template, facing an aluminum plate, of the hydraulic machine, the aluminum plate is extruded through the forming holes, heat dissipation protrusions of an aluminum-clad copper structure are formed on the copper-aluminum composite heat dissipation plate, the width of the heat dissipation protrusions is larger than 1.5 mm, and the heat dissipation protrusions are arranged on the aluminum plate; and the thickness of the aluminum layer on the surface of the heat dissipation bulge is not less than 0.1 mm. The copper-aluminum composite heat dissipation plate is manufactured through the process. According to the technology, the copper-aluminum composite heat dissipation plate can be obtained through a simple manufacturing method, the high heat conductivity of copper and the corrosion resistance of aluminum are compatible, and connection at the copper-aluminum interface is reliable.

A copper-aluminum composite plate material prepared by aluminum liquid continuous casting and a process thereof. The method includes: S1, heating an aluminum ingot to 700-800° C. and smelting for 1-3 h; S2, degassing smelted aluminum liquid, and keeping the temperature and standing; S3, texturing a copper strip, and then cleaning; S4, heating the pretreated copper strip to 200-650° C.; S5, under the protection of inert gas, continuously casting the treated aluminum liquid on the treated copper strip, performing quenching crystallization on a copper-aluminum composite material, and performing oxygen-free continuous casting; and S6, continuous rolling: rolling the continuously cast copper-aluminum composite material to obtain the copper-aluminum composite plate material prepared by aluminum liquid continuous casting.

The invention provides a low-cost high-specific-surface-area cerium-aluminum composite oxide, a preparation method and application thereof, and relates to the technical field of catalysts, the preparation method comprises the following steps: step S1, adding 10-40% of cerium salt, 50-90% of aluminum salt and 0-10% of lanthanum source or zirconium source into deionized water, stirring and mixing, filtering, and washing to be neutral to obtain a cerium-containing solution; step S2, impregnating an alumina carrier in the cerium-containing solution prepared in the step S1, and standing to enable the cerium-containing solution to be impregnated on the alumina carrier, so as to obtain impregnated slurry; and S3, drying the dipping slurry, and then roasting in an inert atmosphere to obtain the cerium-aluminum composite oxide. The stable cerium-aluminum composite material is formed by doping one of lanthanum and zirconium with different masses into aluminum oxide or cerium oxide, the problem that the adsorption capacity of a traditional ammonia trapping method is limited is effectively solved, and the adsorption capacity of the material to ammonia is remarkably improved.

The invention discloses a catalyst for hydrogen production through tar steam reforming and a preparation method and application thereof. The catalyst comprises a cobalt-magnesium-aluminum composite spinel carrier and an active component loaded on the cobalt-magnesium-aluminum composite spinel carrier, the active component comprises nickel and at least one metal additive selected from iron, zirconium and ruthenium. The preparation method mainly comprises the following steps: preparing the carrier by adopting a coprecipitation method, loading the active component by adopting an impregnation method, and drying and reducing to obtain the final catalyst. The catalyst is used for tar component steam reforming hydrogen production reaction, especially for treating raw materials containing phenol and water vapor at 600-700 DEG C, tar conversion can be efficiently catalyzed, product gas rich in hydrogen can be generated, hydrogen selectivity is high, and almost no methane is generated. The catalyst has the advantages of high activity, good stability, strong carbon deposition resistance and the like, and is suitable for purification and high-value utilization of biomass pyrolysis tar.

The invention relates to the technical field of copper-aluminum composite welding, in particular to a thin aluminum bar lap welding method. The method comprises the following steps: firstly, carrying out microstructure regulation and control on a welding surface by adopting a mechanical directional polishing technology, effectively removing a surface oxide layer and forming a uniform rough surface; secondly, accurate management of heat input is achieved through a gradient temperature control strategy, and heat damage to the thin-wall material is avoided; and meanwhile, mutual diffusion of copper atoms and aluminum atoms is promoted by combining a metallurgical transition layer technology, and stable metallurgical bonding is formed. In terms of structural design, a unique positioning system ensures the assembly precision, and the process stability is remarkably improved in cooperation with an optimized welding process. According to the method, the welding quality of the thin aluminum row is improved in a breakthrough mode, meanwhile, the good industrial production adaptability is achieved, and a reliable solution is provided for the connection technology in the fields of power batteries, energy storage equipment and the like.

The invention discloses a copper-aluminum composite board and a preparation method thereof. The preparation method comprises the following steps: pretreatment; rolling is conducted; and friction stir welding. Through combined use of rolling and friction stir welding, energy consumption in the production process can be effectively reduced, defects of a composite interface and the number of intermetallic compounds can be reduced, the influence of a copper-aluminum composite interface on the overall conductivity is effectively reduced, the quality of the copper-aluminum composite pole is improved, and the production cost is reduced. And the prepared copper-aluminum composite board is excellent in comprehensive performance, and the service life of the battery is prolonged.

The invention discloses a laser welding method for a copper-aluminum composite material, which comprises the following steps of: performing upsetting thinning treatment on a three-layer sandwich structure base material to ensure that the total thickness of a welding area is 1.5 mm, the thickness of an aluminum layer is 0.9-1.1 mm (the deformation rate is 10-30%), the thickness of a copper layer is 0.2-0.3 mm, the surface roughness Ra is less than or equal to 1.6 mu m, and the surface roughness Ra of an oxide layer is less than or equal to 5 mu m; a 1064nm optical fiber laser is adopted, welding is conducted at the power of 85%-95%, the speed of 120-150 mm / s and the frequency of 4000-6000 Hz, the fusion depth is 0.3-0.6 mm, and the fusion width is 1.2-2.0 mm. By means of the method, the tensile strength of the connector can be larger than or equal to 110 MPa, the resistivity is smaller than or equal to 2.5 * 10 <-8 > omega.m, the problems that traditional welding strength is low and conductivity is poor are solved, batch quality consistency is ensured, and the method is suitable for the fields of new energy automobiles and the like.

The invention discloses a lightweight topological optimization and assembly control method for a wood-aluminum composite facade, and belongs to the technical field of digital twinning and intelligent construction, and the method comprises the steps: generating a cross-scale parameterized twinning entity; performing iterative optimization by taking the life cycle value as a target to generate a topology design scheme; the scheme is deconstructed into an intelligent construction instruction set; the assembly deviation is calculated by comparing the twinborn model with field actual measurement data; and updating the twin entity based on the deviation feedback. According to the method, a co-evolution architecture combining cross-scale digital twin modeling, full life cycle value optimization and virtual-real fusion closed-loop assembly control is adopted, factors such as material microscopic characteristics, manufacturing cost and long-term durability can be brought into initial design, and self-adaptive correction is carried out on errors in the physical construction stage; and the global optimality of the complex composite structure design and the accuracy and reliability of the physical construction process are remarkably improved.

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 electromagnetic wire materials and manufacturing, and particularly relates to a copper-aluminum composite special-shaped enameled wire and a preparation method thereof.The enameled wire comprises a copper-clad aluminum composite conductor and an insulating paint layer coated on the outer surface of the copper-clad aluminum composite conductor; the composite conductor is composed of a copper layer and an aluminum core, and the volume ratio of the copper layer to the aluminum core is 60%: 40%-70%: 30%. The thickness of the composite conductor is 0.5-2.0 mm, the width of the composite conductor is 2.0-10.0 mm, and the width-to-thickness ratio of the composite conductor is 2-8; the eccentricity of the copper layer is less than or equal to 2.5. The enameled wire has high conductivity, light weight and high reliability, and is especially suitable for high-frequency power electronic devices such as new energy automobile motors, high-frequency transformers and photovoltaic inverters, and application scenarios with high requirements for space utilization rate, heat dissipation performance and long-term stability such as spaceflight and deep sea equipment in extreme environments.

The utility model relates to the technical field of composite belt processing, in particular to an equidistant cutting device for an aluminum-copper composite belt, which comprises a main machine body, a cutting roller arranged on the inner wall of the main machine body, a positioning roller arranged on one side of the cutting roller on the inner wall of the main machine body, and a winding roller arranged on the other side of the cutting roller on the inner wall of the main machine body. A middle shaft is arranged in the middle of the outer side of the cutting roller, side shafts are arranged on the outer sides of the two ends of the cutting roller respectively, infrared sensors are arranged on the outer sides of the side shafts, the width of the copper-aluminum composite belt is detected through the infrared sensors, and cutting blades are arranged on the outer sides of the side shafts and the outer side of the middle shaft. The infrared sensors are additionally arranged on the two sides of the cutting rod, the width of the aluminum-copper composite belt is monitored in real time, the position of the cutting edge is automatically adjusted, it is ensured that no matter how the width of the composite belt changes, all the cut sections can be kept equal in width, the product machining precision and consistency are remarkably improved, and diversified production requirements are met.

The invention relates to the technical field of industrial visual inspection, and discloses a surface defect detection method for a copper-aluminum composite board. The method comprises the following steps: acquiring an original plate surface image through image acquisition equipment, and preprocessing to obtain a standardized image; performing texture field decomposition on the standardized image, separating out independent texture components of the copper layer and the aluminum layer, and calculating a coherence graph among the components; inputting the texture component and the coherence graph into a composite structure discrimination network, guiding feature fusion by the network according to the coherence graph, performing anomaly judgment, and outputting a pixel-level initial defect graph; and performing morphological and topological rule processing on the initial defect graph, generating a final defect contour, and performing superposition labeling on the final defect contour and the original graph. According to the method, the single material layer defect and the composite interface defect can be distinguished by separating the texture of the material layer and utilizing coherence guide analysis, and the detection precision is improved.

The invention provides a three-dimensional aluminum corrugated core composite board and a forming process thereof, belongs to the technical field of aluminum composite board production, and solves the technical problems that an existing aluminum composite board is low in heat dissipation efficiency and poor in heat insulation effect, and forming equipment is low in automation degree. The three-dimensional aluminum corrugated core composite plate comprises a wood paint decorative layer, an aluminum panel, an aluminum corrugated core and an aluminum back plate which are sequentially arranged from top to bottom, the aluminum panel and the aluminum back plate are respectively bonded with the aluminum corrugated core, and the structures of the aluminum panel and the aluminum back plate are the same. The forming process comprises the following steps: pretreating and inputting raw materials; double-sided gluing; carrying out double-sided bonding; straightening and painting; and drying and outputting. The aluminum composite plate is produced through stable input, clamping and carrying, double-sided gluing, plate carrying and double-sided bonding, straightening and painting, drying and shaping, output and the like. The produced aluminum composite plate is stable in structural strength, high in heat dissipation efficiency and better in heat insulation effect, and the forming process is good in bonding effect and high in automation degree.

The invention relates to the technical field of copper-aluminum bars, in particular to a copper-aluminum polymer diffusion hybrid welding method which is characterized by comprising the following steps: S1, welding nickel sheets with bare copper: compounding the nickel sheets with the thickness of 0.1-0.3 mm on the welding surfaces of the copper bars; s2, nickel sheet polishing: mechanically polishing the nickel sheet until the surface roughness Ra is less than or equal to 0.8 mu m; s3, the aluminum row is polished, specifically, the welding face of the aluminum row is polished in a one-way mode through abrasive paper of 800-2000 meshes till the roughness Ra is smaller than or equal to 1.0 micron; s4, copper and aluminum composite welding is conducted, specifically, the copper bar with the polished nickel piece and the polished aluminum bar are composited through polymer diffusion welding, the welding temperature is 400-500 DEG C, the pressure is 10-20 MPa, and heat preservation is conducted for 30-60 minutes; the nickel sheet with the proper thickness is compounded on the welding surface of the copper bar, the binding force of a welding interface is enhanced, then the nickel sheet is subjected to precise mechanical polishing, it is ensured that the surface roughness of the nickel sheet reaches the extremely low level, the welding surface of the aluminum bar is subjected to fine grinding treatment, and the adaptability of the welding surface is improved; and tight combination of the copper bar and the aluminum bar is achieved at specific welding temperature, pressure and heat preservation time, and practicability is high.

The invention relates to the technical field of organic synthetic chemistry, in particular to a preparation method of ethyl 2-n-butyl acetoacetate, which comprises the following specific steps: S1, preparation of a composite solid base catalyst, S2, synthesis of ethyl 2-n-butyl acetoacetate, S3, post-treatment of a reaction solution, and S4, separation and purification of a product. The preparation method has the following beneficial effects that the magnesium-aluminum composite oxide is used as a carrier, and the composite solid base catalyst loaded with potassium and lanthanum has relatively high catalytic activity and selectivity; the magnesium-aluminum composite oxide carrier has a relatively large specific surface area and rich alkaline sites, so that a good catalytic environment is provided for the reaction; as a main active component, potassium ions can effectively activate alpha-active methylene of ethyl acetoacetate and promote formation of negative ion intermediates; the introduction of lanthanum ions can adjust the electronic structure of the catalyst, enhance the stability of the active center and inhibit the occurrence of side reactions.

The invention discloses a graphene-aluminum composite material and a preparation method thereof, and belongs to the technical field of metal-based composite material preparation. The raw materials comprise modified aluminum particles and a graphene dispersing agent; the production process comprises the steps of aluminum particle interface modification treatment, graphene dispersing agent preparation, modified aluminum particle wrapping with graphene, heating pressing and heating extrusion forming. A nanometer interface modification layer is constructed on the surfaces of aluminum particles through a modifier to improve wettability and inhibit generation of Al4C3, a specially-made pressing device improves the compactness of a green body, inert gas protection is matched for extrusion, the performance of the composite material is optimized, and the problems that graphene and an aluminum matrix are poor in interface compatibility, prone to agglomeration, prone to generating brittleness at high temperature and the like are solved; the graphene is uniformly dispersed, and the composite material has excellent mechanical properties and high conductivity and is suitable for industrial mass production.

This application relates to the technical field of concrete anti-seepage materials. Specifically, it provides a concrete anti-cracking and anti-seepage material and a preparation method thereof. The concrete anti-cracking and anti-seepage material comprises the following raw materials in parts by weight: 80-120 parts cement, 20-30 parts silica fume, 5-10 parts polyurea composition, 10-15 parts fly ash, 5-10 parts bentonite, 2-3 parts silane coupling agent, and 1.5-2 parts water reducer. The polyurea composition includes polyurea@LDHs, which are prepared by doping polyurea with a layered magnesium-aluminum composite material. The concrete anti-cracking and anti-seepage material prepared in this application has the advantages of crack resistance and good anti-seepage performance.

The invention discloses a composite aluminum nitride aluminum-coated ceramic substrate packaging module and a preparation method thereof, a composite aluminum nitride aluminum-coated ceramic substrate is composed of pattern surface aluminum, aluminum nitride ceramic, intermediate layer aluminum, aluminum nitride ceramic and non-pattern surface aluminum, the thickness ratio of the pattern surface aluminum to the intermediate layer aluminum is 1 / 15-1 / 4, and the thickness ratio of the non-pattern surface aluminum to the intermediate layer aluminum is 1 / 15-1 / 4. The thickness ratio of the pattern surface aluminum to the non-pattern surface aluminum is 1 / 10-1 / 4, the thickness of the pattern surface aluminum is 0.1 mm-0. 8mm, and the thickness of the aluminum nitride ceramic is 0.6 mm-3mm; the non-graphic surface of the aluminum nitride aluminum-coated composite ceramic substrate is connected with a radiator, the graphic surface of the aluminum nitride aluminum-coated composite ceramic substrate is bonded with a diode through a solder, and the diode is electrically connected through a lead; the composite aluminum nitride aluminum-coated ceramic substrate is formed at a time, the aluminum surface keeps the characteristic of high-purity aluminum, the ceramic-aluminum thickness relation between multiple layers of the composite aluminum nitride aluminum-coated ceramic substrate is reasonably matched, and the toughness and rigidity of the whole material are improved; the ceramic substrate does not need to be bonded with a bottom plate through welding flux after one-time forming, interface thermal resistance is not newly added, and the whole module is high in heat dissipation.

The invention relates to the technical field of copper-aluminum composite cast rolling, and discloses a copper-aluminum composite cast rolling machine which comprises an aluminum smelting furnace, a cast rolling seat and a rolling device used for rolling plates, a casting nozzle is fixedly installed on the aluminum smelting furnace, a copper coil is rotatably installed on the cast rolling seat, and a heating plate used for preheating a copper plate is fixedly installed on the cast rolling seat. A plurality of upper rollers and a plurality of lower rollers are arranged in the cast rolling seat, the upper rollers correspond to the lower rollers in a one-to-one mode, the distance between the corresponding upper rollers and the lower rollers is gradually reduced, according to the copper-aluminum composite cast rolling machine, the upper rollers and the lower rollers drive the detection disc to rotate, and the balls bear centrifugal force and overcome the elastic force of the second springs to slide in the sliding grooves. And when the rotating speed of the detection disc is higher, the centrifugal force borne by the ball is larger, the force sensed by the centrifugal force sensing plate is larger, the corresponding water valve is controlled to introduce more cooling water into the water inlet pipe, the cooling water introduced into the upper roller and the lower roller with the smaller distance is larger, and excessive heat accumulation in the plate is prevented.

The present invention relates to the technical field of composite materials, and solves the technical problem that it is difficult to prepare a diamond / aluminum composite material with a tightly bonded interface while ensuring high thermal conductivity in the prior art. In particular, it relates to a diamond / aluminum composite material with a nano-gradient interface and a preparation method thereof. The present invention introduces a carburizing method on the basis of the magnetron sputtering method, and realizes the in-situ generation of new phases in each modified layer from the outermost metal element layer to the diamond surface through adsorption and diffusion, promotes the transformation of the metal modified elements on the diamond particle surface into carbides, and constructs a nano-gradient interface carbide layer. While the nano-scale interface layer improves the interface bonding between diamond and aluminum, it minimizes the introduced interface thermal resistance to the greatest extent. The present invention combines magnetron sputtering deposition with the carburizing method to prepare a nano-gradient multi-carbide interface layer with precisely controllable thickness, enhances the degree of interfacial diffusion reaction between diamond and aluminum, weakens the interfacial phonon scattering, and can give full play to the high thermal conductivity of diamond particles more fully.

The invention relates to the technical field of battery structures, and discloses a post terminal and a battery, the post terminal comprises: a post terminal body, the post terminal body comprises a first metal post and a second metal post, the second metal post is arranged in a protruding manner relative to the first metal post along the radial direction; the pole body further comprises a third metal column; the third metal column is connected to one end, far away from the first metal column, of the second metal column; the insulating part is arranged on the peripheral sides of the second metal column and the third metal column in a sleeving manner; according to the pole and the battery provided by the invention, the pole body can be directly formed by punching the copper-aluminum composite plate without complicated processing procedures, and the third metal column which is different from the first metal column in metal material is connected to one side, deviating from the first metal column, of the second metal column, so that the joint surfaces of the second metal column and the third metal column are prevented from being pulled.

The invention relates to a graphene / aluminum composite material preparation method, in particular to a graphene / aluminum composite material preparation method for regulating Mg element interface segregation through double reinforced phases. The invention aims to solve the problem that Mg element segregation is easy to occur when an aluminum-based composite material is prepared from graphene or silicon carbide in the prior art. In the pressure infiltration preparation process, due to the fact that two reinforcing phases of graphene and silicon carbide exist in a prefabricated body, the Mg element begins to segregate towards the position near the reinforcing body in the infiltration process, however, due to the fact that graphene and silicon carbide have the attraction effect on the Mg element, the Mg element cannot be completely segregated to an interface of one reinforcing phase, and therefore the Mg element can not be completely segregated to the interface of the reinforcing phase. And more Mg elements stay in a matrix between the graphene and the silicon carbide, so that the interface segregation amount of the Mg elements is reduced, the content of the Mg elements in the matrix is increased, the sequence of precipitated phases of the composite material after solid solution aging is corrected, and the comprehensive mechanical property of the composite material is improved.

The invention provides a hot-pressed aluminum composite decorative plate and a preparation method thereof, and relates to the technical field of building materials.When the aluminum composite decorative plate is manufactured, the interior of a calcium silicate plate is permeated through a reinforcing agent in advance, and then the calcium silicate plate with the uneven bonding plane is leveled; by means of the pretreatment, the drawing strength of the interior of the calcium silicate board is strengthened in advance, the strengthened calcium silicate board is tightly bonded with the leveling layer, then the strengthened calcium silicate board is leveled, the bonding surface of the formed pretreated calcium silicate board is smooth, the bonding binding force is improved, and therefore when the pretreated calcium silicate board is bonded with the aluminum veneer, the bonding strength of the aluminum veneer is improved. The bonding is tighter, so that the internal stress generated by the aluminum veneer is far smaller than the bonding strength of the bonding surface of the aluminum veneer and the pretreated calcium silicate board, and the situation that the aluminum veneer is heated to swell due to the fact that the surface of the calcium silicate board is uneven and the temperature difference of the external environment is large is avoided.

According to the integrally-formed composite material structure based on the three-dimensional printing and casting technology and the preparation method of the integrally-formed composite material structure, the preparation method of the integrally-formed composite material structure comprises the three steps that firstly, three-dimensional printing is conducted on a first metal material to obtain a metal insert, and then aftertreatment is conducted; and finally, the second metal material is heated to be in a molten state, and finally the integrally-formed composite material structure is obtained. According to the method, the 3D printing metal insert is precisely designed to be in butt joint with a traditional casting process, an integrated composite metal structure is formed, and the precision and sealing performance of mold assembly are ensured. And moreover, the complex-shaped material is manufactured through 3D printing, complex material forming which is difficult to complete through a traditional manufacturing process can be achieved, the requirements of different fields for manufacturing the complex-shaped metal material are met, and the limitation of a traditional titanium-aluminum compounding process is broken through. The integrally-formed composite material structure is a material with high precision, high strength and good surface smoothness.

The invention relates to a copper-aluminum-based anti-electromagnetic interference cable conductor with a multilayer composite shielding structure, which comprises a conductor core layer, and is characterized in that the conductor core layer comprises a central bearing core and an inner conductor, the central bearing core is formed by twisting aramid fibers and galvanized steel wires, the inner conductor sleeves the outer side of the central bearing core, and the inner conductor comprises three layers of aluminum alloy wires; the three layers of aluminum alloy wires are alternately and reversely twisted, the sliding nesting layer is arranged on the outer side of the inner-layer conductor in a sleeving mode, six copper-aluminum composite half pipes are spliced to form a complete circular ring, T-shaped sliding grooves are formed in the splicing positions of the adjacent copper-aluminum composite half pipes, two conductive sliding blocks are arranged in the T-shaped sliding grooves, the conductive sliding blocks are made of beryllium copper elastomer materials, and the heads of the conductive sliding blocks are provided with gold-plated heads. And the outer conductor sleeves the outer side of the sliding nesting layer and is formed by bunch-stranding annealed soft copper wires in the same direction. According to the invention, excellent bending resistance of the cable is realized, wire breakage of the conductor can be avoided under a repeated bending condition, a conductive path of the conductor core layer is kept continuous and stable in the whole process, and interruption of electric energy or signal transmission caused by bending is prevented.

The invention provides a method for manufacturing a copper-aluminum composite pipe, which comprises the following steps of: preheating a copper pipe to 600-620 DEG C, and conveying the copper pipe to a graphite mold filled with inert gas; the medium-frequency aluminum melting furnace heats an aluminum raw material to 700-730 DEG C, the aluminum raw material is injected into the copper pipe in the graphite mold, the aluminum solution wraps the outer surface of the copper pipe, and then the cast copper pipe is pulled out of the graphite mold. And a cooling mechanism is used for cooling twice, and the copper-aluminum composite pipe is obtained. By preheating the copper pipe and cooperating with inert gas protection, temperature difference impact and oxidation interference are reduced, and it is guaranteed that molten aluminum is evenly spread; molten aluminum is heated, silicon is added, the liquidity and wettability of the molten aluminum are improved, and CuAl2 brittle phase nucleation is inhibited; a layered cooling mechanism is matched to precisely regulate and control the temperature gradient, and local stress concentration is avoided; and finally, through cooperative control of technological parameters and a dynamic model, the copper-aluminum interface bonding strength and the plasticity of the composite pipe are improved, the interface defect problem is solved, and the copper-aluminum composite pipe with high reliability and long service life is obtained.

A copper-aluminum composite foil and a preparation method therefor. The preparation method comprises the following steps: S1, smelting an aluminum ingot and then pouring same into a preheated casting nozzle, and cooling and crystallizing cast molten aluminum until it is in a semi-molten state, so as to prepare a semi-molten aluminum material; preheating a copper material; contacting the surface of the semi-molten aluminum material with the surface of the copper material, and performing continuous cast rolling to prepare a composite mother blank with a thickness of 7.0-10.0 mm; S2, machining the composite mother blank into a blank with a thickness of 0.15-1.0 mm by means of cold rolling; S3, subjecting the blank to an annealing treatment at 190-300°C under the protection of an inert gas for 10-30 h, and S4, rolling the annealed blank foil to a thickness of 0.01-0.035 mm to prepare the foil. Further disclosed is a copper-aluminum composite foil prepared by the method. The thickness of the foil prepared by the preparation method for a copper-aluminum composite foil is smaller than that in the prior art.

The invention relates to the technical field of casting, and discloses a gas turbine blade casting method which comprises the following steps: preparing a composite surface coating containing zircon powder, silicon carbide particles, alumina micro powder, a silicon-aluminum composite sol binder and a xanthan gum stabilizer; a double-layer gradient coating structure with the inner layer rich in silicon carbide and the outer layer rich in aluminum oxide is formed on the surface of the wax mold through a step-by-step coating technology; and a gas turbine blade casting is obtained through shell preparation, sintering and high-temperature alloy pouring. Through the synergistic effect of a double-phase ceramic particle system, the gradient sintering characteristic of the silicon-aluminum composite sol and the suspension stabilization effect of xanthan gum, the problems that in a traditional coating system, surface layer sintering is uneven, particles are layered and settled, and a sol system is unstable are solved, the surface roughness Ra of a casting is smaller than or equal to 2.5 micrometers, the size precision is improved by 30% or above, and the casting quality is improved. The service life of the coating is prolonged to more than 7 days.

The invention relates to a copper-aluminum composite plate and a preparation method thereof, and belongs to the technical field of metal composite materials. The preparation method comprises the following steps: S1, carrying out microstructuring treatment on the surface of a copper plate to form a rough structure formed by micron-sized pits and bulges on the surface of the copper plate to obtain a microstructured copper plate; s2, depositing a zinc intermediate layer on the surface of the microstructured copper plate through a magnetron sputtering technology to obtain a galvanized copper plate; s3, the zinc middle layer of the galvanized copper plate is attached to the aluminum plate, and the copper-aluminum composite plate is obtained through hot pressing, rolling and heat treatment in sequence; the copper-aluminum composite board has excellent interface bonding strength and toughness.

The invention relates to a preparation method and application of a hardness removal agent, and the method comprises the following steps: 1) alkali fusion reaction: mixing and fusing bauxite and NaOH to generate soluble sodium aluminate NaAlO2; 2) compounding silicon and aluminum: dissolving aluminum silicate in hot water, adding silica sol, stirring and mixing, and regulating the pH value to 11-12 by using NaOH; an aluminosilicate precursor gel is formed; 3) hydrothermal crystallization: transferring the aluminosilicate precursor gel into a high-pressure reaction kettle, and carrying out hydrothermal reaction to promote polymerization of a silicon-aluminum network; and 4) post-treatment: cooling aluminosilicate, centrifugally washing the aluminosilicate until the aluminosilicate is neutral, drying the aluminosilicate at 110 DEG C, and grinding the aluminosilicate to obtain a white powder product. A silicon-aluminum network structure of the hardness removal agent prepared by the method has regular pore channels, the highest calcium and magnesium removal rate can reach 90% or above, the hardness removal agent is high in anti-interference performance, is kept stable in a pH range of 6-12, is not influenced by common Cl <-> and SO4 < 2-> in water, and is high in stability.