426 results about "Diffusion welding" 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.

The invention discloses a connecting method of an FGH99 double-radial-plate turbine disc based on a nanocrystallization high-entropy alloy middle layer, and belongs to the technical field of welding. A high-entropy alloy middle layer is adopted, nanocrystallization treatment is combined to optimize a microstructure, the nanocrystallization high-entropy alloy middle layer is arranged between an upper FGH99 double-radial-plate turbine disc and a lower FGH99 double-radial-plate turbine disc, diffusion connection is conducted in a vacuum diffusion welding furnace, and the welded FGH99 double-radial-plate turbine disc is obtained. Low-damage solid-phase diffusion bonding is achieved at the welding temperature lower than the solid solution temperature of base metal; meanwhile, the nanocrystallization interlayer structure promotes element diffusion, the diffusion welding period can be greatly shortened, the problems of grain coarsening and performance degradation of a heat affected zone caused by long-time heat preservation in a traditional technology are solved, the technical bottleneck of cooperative regulation and control over the strength and toughness of a high-temperature alloy complex component connection interface is broken through, and the application prospect is wide. And a high-reliability solution is provided for efficient manufacturing of the double-radial-plate turbine disc of the aero-engine, and the double-radial-plate turbine disc is particularly suitable for the long-service-life service requirement under the working conditions of extreme high temperature and cyclic loads.

The invention provides a metal riveting structure for an alumina fiber battery shell and a preparation method. The problem of debonding caused by thermal expansion difference and insufficient interface bonding force in traditional metal and ceramic riveting is solved. The structure comprises a metal riveting piece, a connecting layer and a transition layer, a connecting rod of the metal riveting piece penetrates through an inner threaded hole of the connecting layer and goes deep into a stepped groove of the transition layer, and double connection of threaded screwing and stepped groove mechanical embedding is formed; a metal ceramic gradient layer is arranged between the transition layer and the connecting layer and is matched with a thermal expansion coefficient; the thickness of the diffusion layer is 10-100 microns, and the shear strength of the diffusion layer is larger than or equal to 50 MPa. The structure obviously increases the contact area, relieves the thermal stress, improves the interface strength and the long-term reliability in a wide temperature range, and is suitable for high-temperature battery shell connection.

The invention belongs to the technical field of material welding, and discloses a titanium alloy welding method which comprises the following steps: pretreating a to-be-welded surface of a titanium alloy; the pretreated to-be-welded surface is subjected to sand blasting treatment and magnetron sputtering treatment, and an iron film is sputtered on the to-be-welded surface; the titanium alloy with the to-be-welded surface sputtered with the iron film is subjected to annealing treatment in the argon atmosphere; and the to-be-welded surface of the sputtering iron film is welded through a diffusion welding process. According to the characteristic that the iron element can promote mutual diffusion of the titanium alloy, surface sand blasting, magnetron sputtering, stress relief annealing and diffusion welding processes are combined, so that the titanium alloy is tight in interface connection and complete in grain, the plasticity is not obviously reduced while the strength of the titanium alloy is kept, and the requirement for large-scale and integrated aero-engines can be met.

The invention discloses an IC21 single-crystal high-temperature alloy diffusion welding method based on multi-field assistance and a high-entropy interlayer, and belongs to the technical field of welding. Nano high-entropy intermediate layer foil composed of 35% of Ni, 22% of Cr, 20% of Al, 7% of Re, 5% of Ta, 2% of Y, 7.5% of Si and 1.5% of B is adopted and placed between an upper layer IC21 single-crystal high-temperature alloy and a lower layer IC21 single-crystal high-temperature alloy, liquid-phase diffusion welding is conducted in a vacuum diffusion welding furnace by introducing the multi-field coupling effect of an ultrasonic vibration field, a pulsed magnetic field and an electric field, energy field superposition is achieved through multi-field coupling through space-time cooperation, and the high-temperature alloy is obtained. The pulse frequency of the ultrasonic vibration field is matched with the alternating frequency of the magnetic field; a diffusion channel is opened by an electric field, dendritic crystal regulation and defect repair are realized by mid-term superposition of an ultrasonic vibration field and a pulsed magnetic field, finally directional migration and dendritic crystal segregation suppression of a liquid film are realized, the technical bottleneck of high-integrity connection of an ultrathin-wall structure of a single-crystal turbine blade is broken through, and the extreme working condition service requirement of a sixth-generation engine is met.

The invention relates to a stirring friction pretreatment method for an aluminum alloy diffusion welding grain refinement surface, which comprises the following steps: starting from edge lines of a pair of to-be-welded surfaces of an aluminum alloy to-be-welded part, respectively carrying out multi-pass continuous equidistant stirring friction processing on the pair of to-be-welded surfaces, and ensuring that the translation overlapping rate of a stirring needle track between passes is 25-50%; during friction stir processing, water is continuously added for cooling, so that a spiral deformed fine grain layer with the grain size of 50-80 microns and the thickness of 1-2 mm is generated on a pair of to-be-welded surfaces at the position of a columnar stirring needle; and milling the pair of surfaces to be welded after the stirring friction processing is completed until the roughness is Ra 0.1-Ra 0.3, so as to obtain the aluminum alloy diffusion welding grain refinement surface. Compared with a welding seam obtained through a direct diffusion welding method, the welding seam obtained through the method has the higher welding rate and the higher strength, a new thought is provided for production and manufacturing of aluminum alloy, and the method has important significance in improving performance indexes and enhancing service reliability.

The invention discloses an anode porous transmission layer for PEM water electrolysis hydrogen production and a preparation method of the anode porous transmission layer. The preparation method comprises the steps that firstly, a porous titanium plate and a titanium mesh are washed and dried after being subjected to acid pickling; secondly, absolute ethyl alcohol, polyvinyl butyral and titanium powder are evenly mixed to be prepared into slurry, and the slurry is sprayed to the two sides of the dried titanium mesh; and 3, stacking the porous titanium plate and the titanium mesh sprayed with the slurry, and forming metallurgical bonding through vacuum diffusion welding to obtain the anode porous transmission layer. The porous titanium plate and the titanium mesh are metallurgically bonded to prepare the anode porous transmission layer, the platinum plating amount is effectively reduced and the catalyst utilization rate is improved by regulating and controlling the thickness and the pore structure of the porous titanium plate and the plate-mesh stacking mode, and the gas-liquid transmission efficiency of the anode porous transmission layer is improved; and the anode porous transmission layer with strong mechanical support and high gas-liquid transmission efficiency is obtained, is suitable for PEM water electrolysis hydrogen production, and meets the development requirements of high efficiency and low cost of hydrogen production through renewable energy source and PEM water electrolysis coupling.

The invention relates to a welding presetting method for a densely-arranged array group welding seam diffusion welding middle layer, and belongs to the technical field of aero-engines. The welding presetting method specifically comprises the following steps that a to-be-welded piece plate is prepared, and surface machining treatment is conducted on the to-be-welded piece plate; laying a middle layer on the surface of the to-be-welded plate; welding and fixing the two ends of the middle layer and the to-be-welded plate; carrying out multi-welding-spot welding and fixing on the middle layer and the position of each to-be-processed densely-arranged array column on the surface of the to-be-welded piece plate, and completing presetting of the middle layer; densely-arranged array columns and densely-arranged array column holes are machined in the to-be-welded piece plate with the preset middle layer, and the redundant middle layer is removed. According to the invention, proper presetting of the interlayer lamination is realized, the phenomena of hole blocking and hole shrinkage caused by melting of redundant interlayer alloy are eliminated, the influence of the redundant interlayer alloy on the performance of a base material after melting is avoided, and the manufacturing conformity and the use performance of the laminate cooling structure are improved.

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 provides a red copper connector and a diffusion welding method thereof, and relates to the technical field of metal welding, the diffusion welding method of the red copper connector comprises the following steps: taking a red copper base material, and performing nanocrystallization treatment on one side surface of the red copper base material through an ion impact method to form a welding surface; the annealed copper middle layer is placed between the two pieces of red copper base metal, the annealed copper middle layer makes contact with the welding face, and a connector to be welded is formed; and the connector to be welded is welded through a pulse current auxiliary diffusion welding method, the red copper connector is obtained, the welding temperature of the pulse current auxiliary diffusion welding method is 300 + / -5 DEG C, the pressure is 18-22 MPa, and the heat preservation time is 25-35 min. And low-temperature, rapid and small-deformation reliable connection of the red copper base metal is achieved.

The invention discloses a method for connecting a skutterudite thermoelectric material and an electrode by using a high-entropy alloy and low-expansion-coefficient particle composite barrier layer, and relates to a method for connecting the skutterudite thermoelectric material and the electrode. The method aims at solving the problems that an existing conductive connector for connecting a skutterudite thermoelectric material and an electrode through a barrier layer is large in thermal stress and prone to cracking. The method comprises the steps that composite powder of high-entropy alloy and low-expansion-coefficient particles is prepared through a mechanical mixing method; and preparing the high-entropy alloy and low-thermal-expansion-coefficient particle composite barrier layer by adopting a sintering method. And then the barrier layer, the skutterudite thermoelectric material and the electrode are connected into a conductive joint through a diffusion welding or brazing method. The materials of the low-expansion-coefficient reinforced particles comprise but are not limited to low-expansion metal particles, graphite and the like; the components of the high-entropy alloy matrix material comprise, but are not limited to, an Al-Co-Cr-Fe-Ni system, an Fe-Co-Ni-Cu system, an Hf-Nb-Ta-Ti-Zr system and the like. The skutterudite thermoelectric material and the electrode are connected through the composite barrier layer of the high-entropy alloy and the low-expansion-coefficient particles, and the obtained conductive connector has high mechanical strength, a low-resistance interface and excellent thermal stability at the same time. The method is suitable for connecting the skutterudite thermoelectric material and the electrode.

The invention discloses a manufacturing method of a light-weight brake disc for a new energy automobile. The manufacturing method comprises the following steps that firstly, an alloy steel layer and a mold are machined according to the size of an aluminum alloy brake disc; secondly, plasma activating treatment is conducted on the friction face of the aluminum alloy brake disc and the face to be welded of the alloy steel layer; and thirdly, the aluminum alloy brake disc and the alloy steel layer are put into a mold in a vacuum clean environment, the friction face makes contact with the face to be welded, and then vacuum diffusion welding is conducted. According to the manufacturing method, the alloy steel layer is welded on the friction surface of the aluminum alloy brake disc, so that the wear rate is reduced on the basis of keeping light weight, and the service life of the aluminum alloy brake disc is prolonged; meanwhile, the aluminum alloy brake disc and the alloy steel layer are pretreated through plasma activation, so that more sufficient and more uniform atomic-scale combination of the aluminum alloy and the alloy steel is achieved in vacuum diffusion welding, and the method is suitable for the field of automobile brake disc preparation.

The invention discloses a Ti-Al-Mo-Ta-Cr multi-element interlayer for diffusion welding of titanium-aluminum series dissimilar alloys and application of the Ti-Al-Mo-Ta-Cr multi-element interlayer, and belongs to the field of diffusion welding of dissimilar metals. The middle layer is prepared from the following components in percentage by mass: 68.31 percent to 73.64 percent of Ti, 14.78 percent to 14.90 percent of Mo, 6.50 percent to 6.54 percent of Ta, 4.82 percent to 4.84 percent of Al and 0.13 percent to 5.54 percent of Cr, and the sum of the mass percent of all the components is 100 percent. According to the Ti-Mo-Ta-Al-Cr five-element interlayer alloy disclosed by the invention, the oxidation resistance of a diffusion welding joint can be effectively improved.

The invention relates to the technical field of metal material connection, in particular to a magnesium alloy low-temperature diffusion welding method and a magnesium alloy connector, and the magnesium alloy low-temperature diffusion welding method comprises the steps that metal powder is adopted to conduct cold spraying on the surfaces of two magnesium alloys to be welded, a metal coating is formed on the surface of each magnesium alloy to be welded, and the metal powder comprises at least one of copper powder, nickel powder, titanium powder and silver powder; carrying out surface self-nanocrystallization treatment on the metal coating of each magnesium alloy to be welded; and diffusion welding is conducted on the two to-be-welded magnesium alloys subjected to surface self-nanocrystallization treatment through the spark plasma sintering technology. The method aims at solving the problem that the welding effect of the magnesium alloy is affected due to the existence of an oxidation film.

The manufacturing method comprises the following steps that a basalt fiber / graphene modified epoxy resin base plate is prepared, a tungsten carbide reinforced titanium alloy honeycomb layer is formed through selective laser melting (SLM), the titanium alloy honeycomb layer is compounded to the surface of the base plate through vacuum diffusion welding, and the wear resistance of the container floor is enhanced. Gradient silicon nitride ceramic laser cladding is carried out on the surface of the composite substrate, and bionic micro-groove laser etching and diamond-like carbon (DLC) coating deposition are carried out on a cladding layer. According to the manufacturing method of the container floor with the enhanced wear resistance, compared with a traditional steel floor, the weight is reduced by 50% or above, meanwhile, the bending strength is improved to be larger than or equal to 320 MPa, through silane coupling agent pretreatment (KH-550) of basalt fibers and the nanometer enhancement effect of graphene, the impact resistance of the base plate is remarkably improved, and the harsh working condition requirements of high-frequency forklift loading and unloading are met.

The utility model provides a copper aluminum foil soft row welding full-automatic blanking production line, which comprises a strip cutting device and a blanking device, the blanking device comprises a stacking device and a pre-welding device, the stacking device comprises a material placing table, a cutting device and a feeding device, and the pre-welding device comprises a material receiving table, a vibration device, a welding device, a pressing device and an auxiliary material device. The strip cutting device cuts a raw material copper-aluminum foil roll into a plurality of copper-aluminum foil strips along the rolling direction of the raw material copper-aluminum foil roll, the cutting device cuts off the plurality of copper-aluminum foil strips, the plurality of cut copper-aluminum foil strips are respectively stacked on the receiving table in parallel, and the copper-aluminum foil strips are stacked repeatedly to form a plurality of copper-aluminum foil flexible rows, namely copper-aluminum foil flexible row groups. The two ends of each copper-aluminum foil flexible bar of the copper-aluminum foil flexible bar group are welded and fixed, the plurality of copper-aluminum foil flexible bars are fixed together through the nickel sheets to form the copper-aluminum foil flexible bar group, and when the copper-aluminum foil flexible bars are welded by high-molecular diffusion welding, the plurality of copper-aluminum foil flexible bars are welded at the same time, so that the production efficiency is improved.

The invention relates to the technical field of automobile soft copper bar processing, and provides a medium-frequency diffusion welding machine for an automobile soft copper bar, which comprises a bottom plate, the top end of the bottom plate is fixedly connected with a diffusion welding machine main body, a stand column and a quenching box, the stand column is positioned on the front surface of the diffusion welding machine main body, and the top end of the stand column is rotatably connected with a transmission column; the multiple extension plates are evenly and fixedly connected to the outer side of the transmission column, the ends, away from the transmission column, of the extension plates are rotationally connected with supporting shaft rods, the outer sides of the supporting shaft rods are fixedly connected with bearing plates, and copper bar limiting assemblies are arranged in the middles of the bearing plates and used for being matched with the bearing plates to position the automobile soft copper bars; and an adjusting assembly. According to the technical scheme, the technical problems that in the prior art, the automobile soft copper bar lacks effective transmission measures, so that a medium-frequency diffusion welding machine is difficult to carry out continuous welding operation, and the welding efficiency of the automobile soft copper bar is greatly influenced are solved.

The invention discloses a gas heating diffusion welding process for a titanium alloy hollow structure. The gas heating diffusion welding process comprises the steps that a skin containing an edge pressing area is formed; processing the framework; the skin and the framework are assembled; the edge pressing area of the skin is sealed in a welding mode and connected with an air pipe; putting the structure into a mold; putting the mold into a press machine, and connecting an air pipe with an air path system; the gas path system introduces gas to wash the structure; the pressure of the introduced gas is kept positive, and the introduced gas is heated by the gas path system; after the gas is heated to the working temperature, the pressure of the press machine is set to be working pressure; increasing the pressure of the introduced gas, and keeping until the welding is finished; heating of the introduced gas is stopped, the air pressure of the introduced gas and the pressure of the press machine are kept unchanged, and the introduced gas is cooled; and cooling the structure to room temperature. A gas heating mode is adopted, the equipment requirement is reduced, meanwhile, deformation in the forming process can be eliminated by adopting the skin to integrally cover the framework, and the forming quality is improved.

The invention provides a titanium-tantalum alloy and aluminum-silicon alloy composite bar and a preparation method thereof, and relates to the technical field of alloy welding, and the preparation method of the titanium-tantalum alloy and aluminum-silicon alloy composite bar comprises the following steps: processing a titanium-tantalum alloy into a cylindrical core material, processing an aluminum-silicon alloy into a wrapping layer with a cylindrical cavity, and carrying out heat treatment on the cylindrical core material and the wrapping layer to obtain the titanium-tantalum alloy and aluminum-silicon alloy composite bar. The shape of the cylindrical core material is matched with that of the cylindrical cavity, the cylindrical core material is filled and assembled in the cylindrical cavity, the peripheral surface of the cylindrical core material and the inner wall of the cylindrical cavity are tightly attached, sealed and packaged, and an assembly is obtained; and performing three-dimensional diffusion welding on the assembly to obtain the titanium-tantalum alloy and aluminum-silicon alloy composite bar. The titanium-tantalum alloy and aluminum-silicon alloy composite bar is good in interface bonding, and the joint quality is high.

The invention provides a vacuum diffusion welding method of a three-layer gas distribution disc body for a semiconductor, which comprises the following steps of: cleaning to remove an oxidation film on the surface of an aluminum disc body, stacking aluminum 3003 in the middle and aluminum 1060 on the upper side and the lower side respectively to obtain the three-layer gas distribution disc body for the semiconductor, and finally performing vacuum diffusion welding treatment. The problems of low welding binding rate and large deformation during vacuum diffusion welding of large-area aluminum 1060 disc bodies and large-area aluminum 3003 disc bodies are effectively solved, and the prepared three-layer gas distribution disc body for the semiconductor is good in quality and meets use requirements.

The invention discloses a micro-channel plate cooler for a Stirling engine and a cooling method, and the micro-channel plate cooler for the Stirling engine comprises a cooling shell and a heat exchange core body; the whole heat exchange core body is of an annular columnar structure and is formed by stacking a plurality of gas guide plates and a plurality of heat dissipation plates and then conducting vacuum diffusion welding. Hot fluid enters the hot runner of the air guide plate through the flow guide groove, and cold fluid enters the cold runner of the heat dissipation plate through the water inlet; the hot fluid and the cold fluid exchange heat in the plurality of air guide plates and the plurality of heat dissipation plates; and the hot fluid is discharged from the heat exchange core body through the second airflow groove. According to the micro-channel plate type Stirling engine cooler, the design concept of the micro-channel plate type Stirling engine cooler is adopted, the air guide plates and the heat dissipation plates in the heat exchange core are alternately stacked, the heat exchange area of unit volume can be remarkably increased, the compactness of the cooler structure can be improved, the heat exchange power is improved, and the heat exchange efficiency is improved. And a technical method is provided for stable operation of a next-generation megawatt underwater platform efficient Stirling cycle power system.

The invention discloses a vacuum diffusion welding pressing plate with a water cooling structure, and relates to the technical field of vacuum diffusion welding pressing plates, the vacuum diffusion welding pressing plate comprises an upper plate and a lower plate, the upper plate and the lower plate are integrally sintered to form the welding pressing plate, the top of the lower plate is provided with a water cooling channel, the welding pressing plate is made of Mo-Si-B alloy, and the water cooling channel is communicated with the water cooling channel. The bottom of the lower plate is provided with array type micro-protrusions, the height of the protrusions is 50-80 micrometers, the diameter of the protrusions is 100-150 micrometers, and the center distance is 200-250 micrometers. The manufacturing method of the welding pressing plate comprises the following steps that S1, Mo-Si-B alloy components comprise, by atomic percent, 10-15% of Mo, 8-12% of Si, 1-3% of B and 0.5-1.5 wt% of ZrO2 or Y2O3 serving as an additive, and S2, mechanical alloying is conducted, specifically, Mo powder, Si powder, B powder, steel powder and an additive are placed in a high-energy ball milling tank and mixed under argon protection, the ball-to-material ratio of the Mo powder, the Si powder, the B powder and the steel powder is (10-15): 1, the rotating speed of the high-energy ball milling tank is 300-400 rpm, the ball milling time of the high-energy ball milling tank is 20-40 hours, and the nanocrystalline composite powder is prepared.

The invention discloses a DD10 single-crystal high-temperature alloy connecting method based on an intermediate layer and magnetic field assistance, and belongs to the technical field of metal welding. According to the method, a NiCo22Cr20W10Mo7Ta5Ge5Re2Hf0. 8La0. 2 middle layer is adopted, the middle layer is arranged between an upper layer of DD10 single crystal high-temperature alloy and a lower layer of DD10 single crystal high-temperature alloy, diffusion bonding is conducted in a vacuum diffusion welding furnace embedded into a magnetic field generator, and a welding piece of the DD10 single crystal high-temperature alloy is obtained; under the synergistic effect of the two components, the microstructure and the physical and chemical process of the material are regulated and controlled, atomic diffusion is promoted, the microstructure is optimized, the effects of refining grains, controlling liquid level deformation and removing inclusions are achieved, the mechanical property of a joint is improved, the welding quality and efficiency are remarkably improved, and a low-temperature welding workpiece has the excellent performance of high-temperature service; and a high-reliability solution is provided for efficient welding manufacturing of the DD10 single-crystal high-temperature alloy of the aero-engine blade.

The invention discloses a method for diffusion bonding of titanium alloy and stainless steel by using an intermediate layer, which is characterized in that a layer of Ta material and a layer of Ag material are sequentially arranged between a titanium alloy workpiece and a stainless steel workpiece as the intermediate layer, and diffusion welding is realized by heating and pressurizing. The method is applied to diffusion welding connection between Ti alloy and stainless steel, and the problems of brittle phase generation, residual stress concentration, insufficient connection strength and the like caused by large thermal expansion coefficient difference and high interface reaction activity of dissimilar materials can be effectively solved. And the connection residual stress can be better reduced, the connection strength is improved, and the joint interface quality and the overall mechanical property are improved.

The invention discloses a copper-steel bimetallic material and a preparation method thereof, and relates to the technical field of copper-steel bimetallic products. The method specifically comprises the following steps that a, a steel matrix is prepared, specifically, steel is machined into the steel matrix; b) preparing a copper alloy pressed blank: performing compression molding on copper-based powder through a powder metallurgy process to obtain the copper alloy pressed blank; c) assembling: placing the copper alloy pressed compact on a steel substrate to form a to-be-welded compact; and d) diffusion welding: placing the to-be-welded compact on a lower electrode of diffusion welding equipment, controlling an upper electrode of the diffusion welding equipment to extrude the to-be-welded compact and electrify the to-be-welded compact, monitoring the displacement of the upper electrode when the upper electrode pressurizes and heats the to-be-welded compact through the compact, and cutting off the current when the displacement meets a preset condition to finish welding. The invention aims to improve the production process of the existing copper-steel bimetallic material and reduce the processing cost.

The invention provides a diffusion welding method of a CoZrTaB target material, which comprises the following steps: (1) carrying out finish machining on a CoZrTaB target blank to a welding size, and processing a thread on a welding surface of the CoZrTaB target blank by adopting a polycrystalline diamond screwer; (2) first cleaning and PVD titanium film plating are sequentially carried out on the welding face with the machined threads, and a to-be-welded CoZrTaB target blank is obtained; the back plate is subjected to finish machining to the welding size, and a to-be-welded back plate is obtained; and (3) the to-be-welded CoZrTaB target blank and the to-be-welded back plate are sequentially subjected to second cleaning, assembling, sheath welding, high-temperature degassing and diffusion welding, and the diffusion-welded CoZrTaB target material is obtained. According to the diffusion welding method, the polycrystalline diamond screwer is adopted to machine the threads on the welding face of the CoZrTaB target blank, then the titanium film is plated, and the CoZrTaB target material which is high in welding strength and meets the high-temperature sputtering use requirement is obtained.

The invention relates to the technical field of target material preparation, and provides an aluminum-scandium target material and a preparation method thereof.The aluminum-scandium target material comprises a partition plate, a circular ring, an aluminum-scandium target blank, a back plate, an upper supporting plate and a lower supporting plate, and the Sc content of the aluminum-scandium target blank is larger than or equal to 20 at%. After diffusion welding, the flatness of the aluminum-scandium target blank is good, so that the aluminum-scandium target blank part does not need to be machined in the machining process after welding, only the back plate part needs to be machined, and the utilization rate of an alloy material and the production stability are improved. The aluminum-scandium target material prepared by the preparation method has no phenomena of corner chipping, cracking and the like, and is high in dimensional precision, small in error and high in roundness.

The invention discloses a deep learning-based titanium alloy blade rheological property prediction method, and belongs to the technical field of titanium alloy hot working stress analysis, and the method specifically comprises the following steps: 1, cutting a plurality of high-temperature tensile samples from a titanium alloy material after diffusion welding; the titanium alloy high-temperature tensile sample is tested, and rheological curves under different deformation conditions are obtained; step 2, constructing a data set by using the tensile condition parameters and the rheological curve data obtained in the step 1, performing normalization processing on the data set, transforming true stress to an interval of [0, 1], and dividing the data set into a training set and a test set; 3, sending the data set divided in the step 2 into a deep learning model, and outputting the deep learning model based on a training set learning result; and 4, for the deep learning model trained in the step 3, carrying out rheological property prediction by using the trained model. According to the method, the high-temperature rheological property of the TC4 titanium alloy is accurately predicted through the deep learning model.

The application belongs to the field of copper alloy friction, and particularly relates to a heterogeneous layered copper-copper zinc alloy with friction anisotropy and a preparation method thereof. The method comprises the following steps: step (1), mechanical polishing of copper plates and copper zinc alloy plates; step (2), organic oil removal; step (3), alternately stacking the copper and the copper zinc alloy, and diffusion welding to form a copper-copper zinc material blank; step (4), cold rolling of the blank at room temperature with a total deformation of 88% to 98%; and step (5), annealing of the rolled blank in an argon stream at 300 DEG C to 350 DEG C for 3 to 4 hours to obtain the copper-copper zinc alloy. The copper / copper zinc alloy with different layer spacings obtained by the application can be used to study the relationship between the layer spacing and the friction anisotropy by adjusting the layer spacing, thereby providing a criterion for designing a heterogeneous layered alloy with excellent tribological properties.

The invention discloses an aluminum alloy complex cavity diffusion welding method, which is characterized in that a uniform and compact organic molecule adsorption protection layer is formed on the surface of aluminum by completely immersing a cleaned blank in a diethylene glycol dimethyl ether solution for ultrasonic-assisted treatment. The protective film can effectively isolate air at normal temperature and prevent the oxidation film from regenerating; and in the initial stage of diffusion welding temperature rise, the aluminum alloy can be completely decomposed and volatilized, no impurity is left, and the high-activity clean aluminum surface is exposed. According to the method, diffusion welding is carried out under the conditions that the vacuum degree is high, the temperature is 500-560 DEG C and the pressure is 5-15 MPa in cooperation with a positioning tool system matched with the thermal expansion coefficient, aluminum atoms are fully diffused under the condition that no oxidation film hinders exist, and high-quality metallurgical bonding is formed. By means of the technical scheme, the problem that the welding rate is low due to an oxidation film on the surface of the aluminum alloy is successfully solved, meanwhile, the defects of ultrahigh vacuum equipment input and middle layer material introduction are overcome, and the manufacturing quality and production efficiency of complex aluminum alloy components are greatly improved.