1592 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 aims to disclose a preparation process of a high-wettability aluminum alloy and a high-strength and high-conductivity copper-aluminum composite material, and relates to the technical field of metal composite materials, and the high-wettability aluminum alloy and high-strength and high-conductivity copper-aluminum composite material comprises the following components in percentage by weight: 1.2%-2.1% of Si, 0.5%-1.0% of Fe, 0.03%-0.1% of Cu, 0.05%-0.07% of Mn, 0.05%-0.08% of Mg, 0.05%-0.1% of Zn, 0.05%-0.1% of Zr, 0.02%-0.05% of Ti, 20 ppm to 50 ppm of rare earth, and the balance of aluminum and inevitable impurities. Comprising the following steps that high-wettability aluminum alloy is cast and rolled into a semi-liquid alloy aluminum strip, and the thickness of the semi-liquid alloy aluminum strip ranges from 5 mm to 7 mm; casting and rolling to form a semi-solid copper strip, wherein the thickness of the semi-solid copper strip is 0.8-2mm; and the semi-liquid alloy aluminum strip and the semi-solid copper strip are cast-rolled and compounded into a composite metal strip of 6.0 mm-8. 5mm. The high-wettability aluminum alloy has the beneficial effects that the high-wettability aluminum alloy contains Si, Fe, Cu, Zr, Ti and rare earth, and has the characteristics of high strength, high hardness, high wettability and easiness in rolling; the semi-liquid aluminum alloy strip and the high-strength and high-conductivity semi-solid copper strip are continuously cast and rolled, and the formed composite metal strip has the characteristics of high peel strength, difficulty in layering and high conductivity.

The invention belongs to the technical field of processing of copper-aluminum composite bars for electrical connection, and particularly relates to a preparation method of a high-performance copper-aluminum composite material. The Al-based brazing filler metal adopted in the preparation process is prepared from 75-85% of Al, 10-15% of Si and 0.1-10% of Ag through a melt rotary quenching method. When the high-performance copper-aluminum composite material is prepared from the powder Al-based brazing filler metal, firstly, a copper strip is unfolded, and the surface of the copper strip is cleaned; then powder Al-based brazing filler metal is sprayed to the surface of the cleaned copper strip through an electrostatic spraying machine, and meanwhile the surface where the powder Al-based brazing filler metal is attached is treated through a laser shot peening machine; and finally, a conventional cast rolling technology is adopted for completing semi-solid compounding between the copper strip attached with the powder Al-based brazing filler metal and molten aluminum, and the high-performance copper-aluminum composite material is obtained. By using the self-made alloy brazing filler metal and combining with a laser peening adhesion technology, good connection between copper and aluminum can be formed, and formation of harmful phases on a copper-aluminum interface is inhibited on the premise of ensuring electrical properties, so that the interface bonding reliability of the copper-aluminum composite material is improved.

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 the technical field of aluminum alloy material pressure processing, in particular to an aluminum alloy material for preparing a steel-aluminum composite strip and a preparation method thereof.The aluminum alloy material comprises a steel layer and an aluminum alloy layer, and the aluminum alloy layer comprises, by mass, 100 parts of silicon (Si), iron (Fe), copper (Cu), manganese (Mn), magnesium (Mg), zinc (Zn) and the balance aluminum and inevitable impurity elements. According to the method, through the laser interface activation and ultrasonic-assisted rolling technology, the interface bonding degree and the microstructure of the steel-aluminum composite material are remarkably improved, and the stability of the steel-aluminum composite material at the high temperature is optimized. And microalloying elements such as scandium (Sc) are introduced, so that the mechanical property and the corrosion resistance of the material are enhanced. The service life is prolonged through a special high-temperature-resistant coating and an accurate heat treatment process, and the surface hardness and corrosion resistance are improved. The advanced processes ensure high performance and high quality of the composite material, and meet the requirements of high temperature and special environments.

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.

The utility model discloses a cover plate assembly and a battery, which relates to the technical field of batteries, and comprises a cover plate, an inner insulating part and an inner lead-out plate which are sequentially arranged along the axial direction, the terminal post is arranged on the cover plate in a penetrating manner; the first sealing ring is arranged between the terminal post and the inner insulating part in a sleeving manner; the outer insulating part is arranged between the terminal post and the cover plate in a sleeving manner; and the second sealing ring is arranged between the terminal post and the outer insulating part in a sleeving manner. According to the embodiment of the utility model, the first sealing ring and the second sealing ring are matched with each other, so that the sealing performance of the pole on the cover plate can be effectively improved, and the sealing structure is not only suitable for the sealing connection of the positive pole and the cover plate, but also suitable for the sealing connection of the negative pole and the cover plate; the cover plate is particularly suitable for being used in a copper-aluminum composite negative pole, and water vapor impurities and the like outside the cover plate can be prevented from entering a copper-aluminum composite bonding layer through an assembly path to corrode the negative pole.

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 preparation method of a copper-aluminum composite board, which comprises the following steps: S1, carrying out rolling processing on a copper plate, and processing a plurality of embossments on the surface of the copper plate; s2, sequentially carrying out alkali washing, annealing treatment and acid washing on the rolled copper plate; s3, a hot-rolled aluminum plate is selected, and the surface of the aluminum plate is mechanically polished; s4, the floating convex face of the pickled copper plate and the mechanical polishing face of the aluminum plate are attached and assembled, mechanical combination of a copper-aluminum interface is achieved through single-pass large-rolling-reduction cold rolling, and a composite plate is obtained; and S5, the composite board is subjected to diffusion heat treatment, and the copper-aluminum composite board is prepared. According to the method, the copper-aluminum composite board with the high interface bonding strength can be manufactured through traditional equipment, and the method has the advantages of being low in production cost, simple in process and easy to industrially popularize.

The invention provides special-shaped copper pipe machining equipment for a copper-aluminum composite bar and a machining method of the special-shaped copper pipe machining equipment, and relates to the technical field of copper pipe rolling machining. The special-shaped copper pipe machining equipment for the copper-aluminum composite bar comprises a machine tool, and a rolling device, a driving device, a flame jetting device and a straightening device are arranged on the upper surface of the machine tool. According to the special-shaped copper pipe processing equipment for the copper-aluminum composite bar, the fire spraying assembly is arranged in the copper pipe for continuous heating to prevent temperature loss, and the lining assembly is matched to abut against the heated inner wall, so that the problem that uncontrollable pits, protrusions and falling metal impurities are generated on the inner wall in the rolling process due to the fact that the inner wall of the copper pipe is lack of supporting is solved; and the problem of slipping or rigid fracture in the compression process due to temperature loss when the steel sheet enters a medium-temperature brittle zone is prevented.

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 embodiment of the invention provides a middle frame, a preparation method thereof and electronic equipment, relates to the field of electronic equipment, and is used for realizing reliable connection between a middle plate and an outer frame, improving the impact resistance of the middle frame and guaranteeing the consistency of radio frequency performance of a frame antenna of the electronic equipment. The middle frame comprises a middle plate, an outer frame and a connecting piece. The middle plate comprises a mounting hole. The outer frame is located outside the middle plate. The outer frame comprises a main body part and an extension part which are connected, and the extension part and the middle plate are stacked. The connecting piece is located in the mounting hole and connected with the middle plate. The connecting piece is welded with the extension part. Wherein the material of the middle plate comprises one of magnesium alloy, a magnesium-based composite material and aluminum alloy. The outer frame is made of one of aluminum alloy, a titanium-based material, an iron-based material, a titanium-aluminum composite material and a steel-aluminum composite material. And the microhardness of the connecting piece is greater than that of the middle plate. The middle frame is applied to the electronic equipment so as to improve the performance of the electronic equipment.

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 a photovoltaic V-shaped copper-aluminum composite belt and a production process thereof. The production process comprises the following steps: (a) rolling a copper belt; (b) rolling an aluminum belt; (c) carrying out composite molding; (a) rolling a copper strip, namely processing the oxygen-free copper wire to obtain the copper strip, and (b) rolling an aluminum strip, namely processing the aluminum strip to obtain the aluminum strip; (c) composite forming is conducted, specifically, the copper strip obtained by rolling the copper strip in the step (a) and the aluminum strip obtained by rolling the aluminum strip in the step (b) are subjected to cold rolling compounding, and a copper-aluminum composite strip is obtained; and (d) V-shaped surface forming is conducted, specifically, rolling forming is conducted on the aluminum strip surface of the copper-aluminum composite strip, a V-shaped groove is formed, and the V-shaped copper-aluminum composite strip is obtained. Copper and aluminum compounding is achieved, the conductive performance close to that of a copper material is achieved, and a large number of copper resources are saved; the V-shaped copper-aluminum composite belt can reflect sunlight irradiated on the surface, the sunlight can reach the surface of the cell through secondary reflection, the sunlight can be reused, and the utilization rate of the sunlight is improved.

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 utility model discloses an aluminum composite wire straightening device which comprises a bottom plate, a support plate is fixedly connected to the surface of one side of the bottom plate, a base frame is fixedly connected to the surface of one side of the support plate, a straightening assembly is movably connected to the upper end of the base frame, and a traction assembly is fixedly connected to the surface of one side of the bottom plate. And a rear rack is arranged at the upper end of the traction assembly. The first motor works to drive the rotating rod to rotate, the rotating gear drives the rotating ring to rotate through the gear groove, the roller swing support freely rotates at a limited angle at the upper end of the connecting plate, and the two straightening rollers can rotate by 360 degrees around an aluminum composite wire rod to straighten the aluminum composite wire rod while freely rotating at the limited angle. The three straightening assemblies are used for carrying out straightening treatment on the wire rod in a sectional mode in sequence, through 360-degree pressing straightening, it is ensured that the wire rod is evenly pulled and straightened in all directions, the overall shape of the wire rod is more uniform, possible distortion or deformation is reduced, and therefore the quality and reliability of products are improved.

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 relates to a continuous casting and rolling process for a copper-aluminum composite board. The process comprises the following steps of: putting an aluminum ingot into a smelting furnace, melting the aluminum ingot into molten aluminum, loading a coiled copper strip onto an uncoiling machine at the top of a die-casting machine, preparing for continuous die-casting, and manufacturing a copper-aluminum composite board strip; a liquid outlet of the smelting furnace is opened, rollers on the die-casting machine and an uncoiler are started, molten aluminum is output from the liquid outlet of the smelting furnace, enters a material groove and flows into a material nozzle through the material groove, the molten aluminum is conveyed to the position between the rollers of the die-casting machine through the material nozzle, meanwhile, a copper strip is also conveyed to the position between the rollers of the die-casting machine, and a copper-aluminum composite plate strip is formed through rotation of the rollers in a die-casting mode; the rollers on the die-casting machine comprise the upper roller and the lower roller, the copper strip is fed along the surface of the upper roller, and the conveying speed of the copper strip is consistent with the rotating speed of the upper roller. According to the process, the input speed of the copper strip and the rotating speed of the upper roller are set to be consistent, so that the copper-aluminum contact length and time are changed, mutual diffusion of metal can be effectively controlled, and the bonding strength of the copper-aluminum composite plate is improved.

The invention relates to a SiOC modified boron carbide-aluminum oxide composite material and a preparation method thereof. The SiOC modified boron carbide-aluminum oxide composite material comprises a porous structure boron carbide-aluminum oxide material and a SiOC layer coating and modifying the porous structure of the boron carbide-aluminum oxide material and the surfaces of boron carbide and aluminum oxide particles, the porosity of the boron carbide-aluminum oxide material with the porous structure is 20 to 40 percent.

A copper-aluminum composite electric energy transmission system and a processing method therefor. The system includes a copper terminal and an aluminum cable. The aluminum cable includes an aluminum conductor and an insulation layer cladding a periphery of the aluminum conductor. The system further includes an electric energy transmission aluminum piece, in which a section of the aluminum conductor with the insulation layer stripped from the aluminum cable is pressed to form a connecting piece. The electric energy transmission aluminum piece and a front end of the aluminum conductor form a molten layer. An end of the copper terminal for being welded to the electric energy transmission aluminum piece is provided with a welding platform. The molten layer clads the welding platform to form a transition layer with metal atoms penetrating into or combined with each other.

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 preparation method of a diamond / aluminum composite material for reducing a thermal expansion coefficient by using a negative expansion material. Relates to a preparation method of a diamond / aluminum composite material. In order to reduce the thermal expansion coefficient of the diamond / aluminum composite material, the thermal matching between the diamond / aluminum composite material and a semiconductor is improved. The material with the negative expansion coefficient is introduced on the basis of the diamond / aluminum composite material to serve as a reinforcement body, the thermal expansion coefficient of the prepared diamond / aluminum composite material is adjustable, the requirements for the thermal expansion coefficient under different service conditions can be met through component design, and then the thermal expansion coefficient of the composite material is adjusted and controlled. The thermal expansion coefficient of the prepared diamond / aluminum composite material is closer to that of semiconductor devices such as Si and GaN, and the requirement of an electronic packaging thermal management material for thermal expansion coefficient matching is better met.

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.