513 results about "Diffusion welding" patented technology

The invention provides a high-entropy alloy intermediate layer for GH5188 instantaneous liquid phase diffusion bonding and a bonding method of the high-entropy alloy intermediate layer, and relates to the technical field of metal welding, the high-entropy alloy intermediate layer is composed of Co, Ni, Cr, Al, Ta, Ge, Zr and Y according to the atomic ratio of 25: 20: 20: 15: 10: 5: 3: 2, and the element purity is larger than 99.99 wt.%. The invention further provides the bonding method of GH5188 instantaneous liquid phase diffusion bonding. The high-entropy alloy intermediate layer is arranged in the middle of the base metal GH5188 and is arranged in the vacuum diffusion welding furnace for welding, and compared with conventional instantaneous liquid-phase diffusion bonding, formation of brittle compounds can be inhibited, and improvement of the comprehensive performance of an interface is facilitated.

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 discloses a tungsten and copper alloy diffusion welding method and a tungsten / copper alloy welding part, and relates to the field of heterogeneous metal diffusion welding. A diffusion welding method for tungsten and copper alloy comprises the following steps that pure copper is softened and annealed; finish machining; the to-be-welded surfaces of tungsten and pure copper are polished and subjected to acid pickling; tungsten and pure copper are cleaned, baked and degassed; tungsten, pure copper and pure iron are combined and subjected to high-temperature diffusion welding, and a tungsten / pure iron / pure copper composite part is obtained; the tungsten / pure iron / pure copper composite part and the copper alloy are subjected to finish machining, the to-be-welded faces of the tungsten / pure iron / pure copper composite part and the copper alloy are polished to be bright, and then acid pickling treatment, ultrasonic cleaning and baking degassing are conducted; and the tungsten / pure iron / pure copper composite part and the copper alloy combination are subjected to diffusion welding, and a tungsten / copper alloy welding part is obtained. The method solves the problems that a single-layer copper intermediate layer is difficult to form metallurgical bonding with tungsten, interface defects are easy to form during casting, and the interface thermal conductivity of a single-layer iron intermediate layer is insufficient.

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 relates to the technical field of brazing, in particular to a heterogeneous material brazing joint and a preparation method thereof. The preparation method comprises the following steps that S1, a porous metal net is placed on the surface of a to-be-welded steel substrate for diffusion welding, and the steel substrate with the surface configuration is obtained; and S2, the configuration face of the steel base body serves as a face to be welded, the steel base body with the surface configuration is assembled with brazing filler metal and a titanium base body to be welded, and then vacuum brazing is conducted. According to the method, the porous metal net is welded to the surface of the steel substrate to be welded through diffusion welding, a periodic heterogeneous microstructure surface is formed on the steel substrate, a discontinuous mismatched and multi-phase alternating interface structure is constructed in a customized mode, a continuous stress line of a connector can be cut off, rapid initiation and rapid expansion of cracks are restrained, and strengthening and toughening brazing connection of titanium and steel can be achieved.

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 provides a composite bar and a welding method. The welding method comprises the following steps that chemical and mechanical composite treatment is conducted on the surfaces of a 4J29 kovar alloy pipe and a TU1 oxygen-free copper bar; the TU1 oxygen-free copper rod is placed in a liquid nitrogen medium, and after the TU1 oxygen-free copper rod is cooled to-150 DEG C, assembling is conducted; the assembled 4J29 kovar alloy pipe and TU1 oxygen-free copper bar are placed in a furnace cavity of current-assisted vacuum diffusion welding equipment, a pressure head assembly is used for axial loading, and a pulse current meter is connected with the pressure head assembly; and the assembled 4J29 kovar alloy pipe and TU1 oxygen-free copper bar are subjected to current-assisted vacuum diffusion welding machining, and the 4J29 kovar alloy pipe and TU1 oxygen-free copper bar composite bar is obtained. According to the method, the interface diffusion behavior is regulated and controlled through cooperation of the pressure field, the temperature field and the current field, dissimilar welding of the 4J29 kovar alloy pipe and the TU1 oxygen-free copper bar is achieved, the microstructure of the composite bar obtained through the method shows that defects such as air holes and inclusions are not observed in a weld joint area, the process is simplified, and energy consumption is reduced.

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 discloses a preparation method for obtaining a high-toughness joint through femtosecond laser treatment of nickel-based superalloy, and relates to the technical field of welding. The method comprises the following steps: pretreating the surfaces of two nickel-based high-temperature alloys to be welded; femtosecond laser treatment parameters are set, and femtosecond laser is adopted to conduct scanning treatment on the surfaces of the two pretreated nickel-based high-temperature alloys; and welding the two nickel-based high-temperature alloys subjected to femtosecond laser treatment by adopting TLP diffusion welding, and obtaining the high-toughness welding joint after welding is completed. According to the method, the optimal surface wettability of the nickel-based superalloy is obtained through femtosecond laser, melting reduction elements (such as B and Si) are diffused to the high-temperature nickel-based superalloy more quickly, the brittle phase of a connector is eliminated more quickly, the good connection effect is achieved at the low pressure and temperature through TLP diffusion welding, and compared with a traditional welding method, the welding defects can be effectively reduced, and the welding quality is improved. And the quality and performance of the joint 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 relates to the technical field of diffusion welding, in particular to a diffusion welding process for a large-area thin-plate structural member, which comprises the following steps of: additionally arranging flexible plates on contact surfaces of an upper welding tool and a corresponding to-be-welded plate as well as a lower welding tool and the corresponding to-be-welded plate respectively; and during diffusion welding, welding pressure is transmitted to the to-be-welded plate through the flexible plate. The diffusion welding process for the large-area thin-plate structural member aims to solve the problem that random and irregular defects are generated due to the fact that the surface of a plate of the large-area thin-plate structural member is uneven.

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 titanium-based interlayer for titanium-aluminum series dissimilar alloy diffusion welding and a preparation method and application of the titanium-based interlayer, and belongs to the field of dissimilar metal diffusion welding. The middle layer is prepared from the following components in percentage by mass: 72.7%-83.1% of Ti, 13.5%-14.8% of Mo and 2.1%-13.8% of Ta, and the sum of the mass percentages of all the components is 100%. According to the method, the oxidation resistance of the diffusion welding head is remarkably improved while the welding quality and precision are guaranteed, high-quality and high-performance diffusion welding of the TiAl / Ti2AlNb composite component is achieved, and the design index and use reliability requirements are met.

The invention provides a PCHE core based on gradually-shrunk and gradually-expanded channels and a preparation method of the PCHE core, and belongs to the technical field of heat exchange equipment, the PCHE core specifically comprises heat exchange plates, the heat exchange plates are provided with semi-oval channels, the semi-oval channels on the two heat exchange plates are oppositely arranged to form an oval channel, the multiple oval channels are arranged in a stacked mode, and the heat exchange plates are arranged in the oval channel. The elliptical channels for circulating the hot fluid and the elliptical channels for circulating the cold fluid are alternately arranged; an inner inserting piece is arranged in the oval channel, one opposite side wall of the inner inserting piece is connected with the side wall, in the short axis direction, of the oval channel, and a periodic gradually-shrinking and gradually-expanding channel is formed between the remaining side wall of the inner inserting piece and the remaining side wall of the oval channel. An elliptical channel is prepared by chemical etching, and an interposer is fixed in the elliptical channel by diffusion welding technology to form a tapered and divergent channel. According to the treatment scheme, the heat exchange efficiency and the precision and consistency of the structure are improved, and the manufacturing process is simplified.

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 discloses a high-strength graphene / metal composite heat dissipation plate with high transverse and longitudinal thermal conductivity and a preparation method thereof, and relates to the field of chips, the composite heat dissipation plate is formed by connecting a plurality of multi-layer graphene sheets through metal columns, and the upper surface, the lower surface and the peripheral side surfaces are packaged by metal foils; all the components are connected together through seamless diffusion welding. By embedding the high-strength and high-heat-conductivity metal columns into the multi-layer graphene with high transverse heat conductivity, heat can be quickly transferred in the transverse direction and the longitudinal direction at the same time. And packaging is carried out through the high-strength and high-heat-conduction metal foil, so that the strength of the heat dissipation plate is improved. An innovative graphene / metal seamless diffusion welding process is adopted, through precise optimization of the welding temperature and pressure, the part size and the like, efficient seamless combination of the metal-graphene composite material is achieved, the heat conduction performance and the mechanical strength of the composite material are improved, and the interface thermal resistance is reduced.

The novel graphite jig comprises a top plate, a welding jig body, a base and a connecting assembly, the top plate and the base are circular and are correspondingly arranged up and down, and a first opening and a second opening are formed in the middle of the top plate and the middle of the base in a penetrating mode respectively. During use, the welding jigs are circumferentially and uniformly arranged between the top plate and the base, the welding jigs are made of graphite, heat transfer can be better carried out, the welding jigs are connected and fixed through the connecting assemblies, the welding jigs can be stacked up and down, and the welding jigs are not prone to falling off. Each welding jig can be detached and replaced independently, so that scrapped welding jigs of people can be detached and replaced conveniently, replacement cost is saved, and the welding jig has the advantages of being high in practicability and convenient to replace.

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 invention provides a titanium-steel cylindrical part construction method, which belongs to the technical field of metal material welding and comprises the steps of sample pretreatment, sample placement and diffusion welding. According to the method, appropriate parameters such as diffusion welding temperature, time and pressure are selected, the axial load of diffusion bonding equipment is applied to the upper end of the titanium alloy cylindrical part, flowing deformation of ceramic particles is restrained through the outermost hard alloy or graphite jacket, the axial load is converted into radial load through the fluidity of the ceramic particles, and the axial load is applied to the upper end of the titanium alloy cylindrical part. The radial load acts on a laminated structure interface through the titanium alloy layer from outside to inside, a transition solid solution can be formed at the structure interface, good interface combination is achieved, meanwhile, mutual diffusion of titanium and iron elements is prevented through the existence of the middle layer, and formation of brittle ferrotitanium intermetallic compounds is avoided. The welding joint obtained through the method has the advantages of being good in combination, free of pores and cracks and the like.

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 belongs to the technical field of metal welding equipment, and particularly relates to a metal molecule diffusion welding machine which comprises a rack, a supporting device, a lifting device, a balancing device, an upper welding device and a lower welding device, a machining notch is formed in the rack, and the supporting device, the lifting device, the balancing device, the upper welding device and the lower welding device are all arranged on the rack. The lower welding device is arranged in the rack, the carrying end of the lower welding device is located in the machining notch, the supporting device is located on the side face of the rack, the supporting face of the supporting device extends to the carrying end side of the lower welding device, the lifting device is arranged in the rack, and the lifting end of the lifting device extends downwards into the machining notch. The balancing device is fixedly installed at the lifting end of the lifting device, the upper welding device is fixedly installed at the bottom of the balancing device and located above the carrying end of the lower welding device, and the balancing device is slidably connected with the rack.

The invention discloses a method for connecting a skutterudite thermoelectric material and an electrode by using a high-entropy alloy and soft pure metal composite intermediate layer, and relates to a method for connecting the skutterudite thermoelectric material and the electrode. The objective of the invention is to solve the problems of large interface residual stress and easy cracking of an electric connection joint of an existing skutterudite thermoelectric material and an electrode. The method comprises the following steps: 1, cleaning a skutterudite thermoelectric material and an electrode; 2, preparing a composite intermediate layer of soft metal and high-entropy alloy by using methods such as electroplating, physical vapor deposition, sheet or powder intercalation hot pressing and the like, and performing diffusion welding connection on the cobalt ore thermoelectric material and the electrode by using the composite intermediate layer; the material of the soft metal layer comprises but is not limited to Ni, Cu, Fe, Al, Nb, Au, Ag or Pt; and the components of the high-entropy alloy layer comprise but are not limited to an Al-Co-Cr-Fe-Ni system, an Fe-Co-Ni-Cr-Mn system, an Fe-Co-Ni-Cu system, a Mo-Co-Cr-Fe-Ni system, an Hf-Nb-Ta-Ti-Zr system, an Nb-Ti-V-Zr system and an Mo-Nb-Re-Ta-W system. The skutterudite thermoelectric material obtained by utilizing the composite lamination of the soft metal intermediate layer and the high-entropy alloy intermediate layer and the electrode contact have low contact resistivity, extremely high thermal stability and high mechanical property of a connection interface at the same time. The method is suitable for connecting the skutterudite thermoelectric material and the electrode.

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.