1134 results about "Aluminum composites" patented technology

The invention discloses a method for preparing a copper-aluminum layered composite board by introducing laser into an intermediate layer, which comprises the following steps: introducing laser into the intermediate layer (Al-Cu-Mg-Si-Zr-Sc series alloy), so that on one hand, copper and aluminum to be compounded are in a heating state to be subjected to rolling compounding by utilizing the heat conduction effect of the heated intermediate layer; the rolling reduction rate and the rolling mill capacity requirement are obviously reduced; and on the other hand, the added middle layer has excellent obdurability, so that the cooperative deformation capacity between the to-be-compounded dissimilar materials can be improved, and the interface bonding performance of the composite material is improved. And a mode of'introducing laser into the middle layer and carrying out short-time online annealing treatment 'is adopted to replace'large down pressure and long-time diffusion annealing' adopted by a traditional copper-aluminum composite material, so that the processing and forming efficiency of the copper / aluminum composite material is remarkably improved, and the method has the characteristic of short process.

The invention belongs to the technical field of batteries, and discloses a battery cover plate and a battery, the battery cover plate comprises a connecting sheet and a copper-aluminum composite pole, the connecting sheet comprises a connecting body and a plugging boss, the copper-aluminum composite pole comprises a first pole body and a second pole body, a copper-aluminum interface is formed between the first pole body and the second pole body, and the plugging boss is arranged on the connecting body. The first pole body is provided with a first limiting structure, the length size of the first pole body along the first direction is L, the length size of the first limiting structure along the first direction is L1, and (L-L1) / 2 is greater than or equal to 2mm. On one hand, the accuracy of the relative position of the connecting piece and the copper-aluminum composite pole column is ensured through the insertion of the insertion bulge and the first limiting structure during welding, and the damage to a copper-aluminum interface caused by dislocation is avoided, and on the other hand, the length size L and the length size L1 are limited; and enough structural strength between the first limiting structure and the copper-aluminum interface is ensured, so that relatively high connection precision and welding yield are achieved after welding.

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 disclosed nondestructive testing device for internal defects of a copper-aluminum composite board comprises a base plate, the base plate is connected with a C-shaped frame through an integral moving device, the upper end and the lower end of the C-shaped frame are respectively provided with an X-ray source and a ray detector, and the X-ray source and the ray detector are oppositely arranged; a signal conversion device, a high-voltage power supply and a control host are further arranged on the bottom plate, the high-voltage power supply is connected with the X-ray power supply, and the ray detector is in electric signal connection with the control host through the signal conversion device. The X-ray principle is utilized to irradiate the copper-aluminum composite board, the density difference in the board is reflected through the X-ray imaging board, the internal defects of the board are automatically judged through an algorithm, X-rays penetrate through the detected board and do not affect or damage the board, and the non-contact detection mode is compared with a destructive detection means, so that the detection accuracy is improved. The problem that a product is damaged in the detection process is solved.

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 relates to a high-energy-density reactive compensation module, which comprises a compensation unit group, an integrated heat dissipation structure, a high-speed switching circuit and a module communication interface, and is characterized in that the compensation unit group is formed by integrating a plurality of solid-state capacitors and units in a packaging shell in a three-dimensional stacking manner; the positive electrode and the negative electrode of each solid-state capacitor unit are connected in parallel through a plurality of layers of conductive busbars, the integrated heat dissipation structure is embedded in the packaging shell and comprises a heat conduction substrate, a micro-channel cooling pipe and a phase change material layer, the heat conduction substrate is in direct contact with the solid-state capacitor units, and the micro-channel cooling pipe is connected with the phase change material layer. And the micro-channel cooling pipes are distributed in the interlayer of the heat-conducting substrate. Through the design of the three-dimensional stacked solid-state capacitor and the copper-aluminum composite busbar and the combination of the hybrid isolation driving circuit and an anti-interference structure, microsecond-level switching response is realized, a multi-protocol communication interface is integrated to support cooperative control of a heterogeneous system, the problems of heat dissipation, loss and the like under high-density integration are solved, and a miniaturized and high-reliability reactive compensation solution is provided.

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 cross-scale graphene / aluminum composite material machine learning design method, and belongs to the technical field of metal material property prediction. In order to inhibit serious interface reaction of graphene and a metal matrix at an interface, a method for accelerating a first principle by machine learning is utilized, alloy elements suitable for segregation towards a graphene / aluminum interface are selected in a periodic table range of elements, and elements suitable for being doped in the aluminum matrix and having no negative influence on mechanical properties of the matrix are selected; the influence of graphene distribution and temperature on the mechanical property of the cross-scale graphene / aluminum composite material is determined through a molecular dynamics simulation method, and the preparation process range of the cross-scale graphene / aluminum composite material is determined; alloy elements suitable for segregation to a graphene / aluminum interface and elements suitable for being doped in an aluminum matrix and having no negative influence on mechanical properties of the matrix are compared to obtain an intersection, doped elements are determined, and then experimental verification is performed based on a preparation process of the cross-scale graphene / aluminum composite material.

The invention aims at disclosing a high-flatness and high-heat-conductivity titanium-aluminum composite plate, a forming process and a heat treatment device, and relates to the technical field of titanium-aluminum composites.The high-flatness and high-heat-conductivity titanium-aluminum composite plate is formed by compositing a TC4 alloy titanium plate with the first thickness and a high-strength aluminum plate with the second thickness; the first thickness accounts for 12%-50% of the total thickness of the composite board, and the total thickness of the composite board is 2.0 mm-7. 5mm; the TC4 alloy titanium plate comprises the following components in percentage by weight: 86 to 89 percent of titanium, 5.5 to 6.8 percent of aluminum and 3.5 to 4.5 percent of vanadium; the high-strength aluminum plate comprises 0.4 wt%-0.8 wt% of silicon, 0.7 wt% of iron, 0.15 wt%-0.4 wt% of copper, 0.15 wt% of manganese, 0.8 wt%-1.2 wt% of magnesium, 0.04 wt%-0.35 wt% of chromium, 0.25 wt% of zinc, 0.15 wt% of titanium and aluminum, and the titanium-aluminum composite plate has the beneficial effects that the thickness of the TC4 alloy titanium plate in the titanium-aluminum composite plate accounts for 12%-50% of the total thickness, that is, the titanium-aluminum composite plate is mainly the high-strength aluminum plate, and due to the fact that the high-strength aluminum plate is lower in density and lower in cost, the titanium-aluminum composite plate can be used for manufacturing the high-strength aluminum plate; the titanium-aluminum composite plate has the advantage in the aspect of cost performance; and clamping a plurality of staggered-surface laminated plates between the first counterweight plate and the second counterweight plate, and carrying out heat treatment to enable the flatness of the composite plate to be 0.5-1mm, so that the composite plate can be used for preparing the high-throughput operation cabinet.

The invention discloses core-shell structure composite powder and a preparation method and application thereof.The core-shell structure composite powder is core-shell structure nickel-coated aluminum composite powder, and the core-shell structure nickel-coated aluminum composite powder comprises inner core aluminum powder and an outer shell nickel layer on the surface of the aluminum powder; the core-shell structure composite powder is prepared by adopting a method of combining ultrasonic chemistry and high-pressure liquid phase reduction. The core-shell structure composite powder provided by the invention is widely applied to various fields of railways, aviation, electric power, chemical engineering, petroleum, automobiles, metallurgy and the like. In the spraying process, nickel and aluminum can generate a strong alloying exothermic reaction, and a firm coating can be formed on the surface of a matrix in a metallurgical bonding mode, so that the coating has a wide application prospect especially in the spraying field.

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 aims at disclosing a forming process and a hot rolling device of a high-thermal-conductivity titanium-aluminum composite plate, and relates to the technical field of titanium-aluminum composites.The forming process comprises the following steps that S1, laser texturing is conducted on the surface of a TC4 alloy titanium plate so as to remove an oxide layer on the surface of the TC4 alloy titanium plate, and the roughness of the surface of the TC4 alloy titanium plate is textured to Ra2.0 micrometers to Ra3.0 micrometers through laser; s2, the TC4 alloy titanium plate and the high-strength aluminum plate are prepared into a composite plate through a hot rolling composite technology, and the titanium face of the composite plate faces the ground; s3, the hot-rolled composite plate passes through a guide roller in an upward inclined mode and then is discharged in an inclined downward mode; s4, the discharged composite plate is cut into a plurality of plates with the same size according to the set size, and the plates are arched; the method has the beneficial effects that oxides on the surface of the TC4 alloy titanium plate are removed through laser texturing, new titanium alloy is exposed, metal bonding and mechanical meshing of a titanium-aluminum interface are remarkably enhanced, and the heat conduction performance and bonding strength of the composite plate are fundamentally 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 preparation method and application of a hydrotalcite-like compound derivative magnesium-aluminum composite oxide with a coral spherical structure, magnesium nitrate is taken as a magnesium source, aluminum nitrate is taken as an aluminum source, a proper amount of citric acid and urea are introduced, and under the thermal action of an alcohol-water mixed solvent, a citric acid intercalated hydrotalcite-like compound is obtained in one pot; and further roasting to obtain the derived magnesium-aluminum composite oxide. The magnesium-aluminum composite oxide has a unique coral spherical structure, is endowed with a large specific surface area and a developed pore structure, contains rich alkalescence and moderately strong alkaline sites and oxygen vacancies, shows excellent activity and stability in a high-concentration COS system, and is suitable for being used as a catalyst for a COS hydrolysis reaction.

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 provides a manufacturing process of a copper-aluminum composite belt with a caulking groove structure, and relates to the field of copper-aluminum composite materials. The manufacturing process comprises the following steps: S1, preparing a special-shaped copper strip; the upper plate surface of the special-shaped copper strip is a convex arc surface, the lower plate surface of the special-shaped copper strip is a plane or a concave arc surface, and the width of the upper plate surface is greater than that of the lower plate surface; at least one caulking groove is formed in the lower plate surface, the groove bottom surface of the caulking groove is a concave arc surface, and at least one of the two groove edge surfaces inclines outwards; s2, the lower plate face, provided with the caulking groove, of the special-shaped copper strip is placed on the molten aluminum, and the special-shaped copper strip obliquely enters the roll gap in the length direction of the caulking groove to be subjected to cast-rolling compounding with the molten aluminum; after casting and rolling compounding, ensuring that the two groove edge surfaces are inclined outwards; s3, cold rolling and annealing; and S4, forming processing. According to the invention, the groove bottom angle and the groove top angle of the caulking groove are obtuse angles after cast rolling, so that the stress generated in a corner area when molten aluminum is solidified is reduced, and the anti-stripping performance of the copper-aluminum composite belt is effectively improved.