2805 results about "Copper alloy" patented technology

The invention provides a low-voltage cable, and relates to the technical field of cables, the low-voltage cable comprises a conductor layer, a support layer, a shielding layer and a sheath layer, the conductor layer is composed of multiple strands of fractal stranded conductors, and each fractal stranded conductor comprises an inner-layer superfine silver-plated copper wire, a middle-layer copper-clad aluminum wire and an outer-layer nickel-plated copper alloy wire; the supporting layer wraps the conductor layer and comprises an inner supporting layer, a dynamic framework layer and an outer restraint layer, the inner supporting layer is an obliquely wound aramid fiber woven belt, the dynamic framework layer is formed by alternately arranging shape memory polymers and carbon fiber composite belts, and the outer restraint layer is a spirally wound silica gel-glass fiber composite rope. The shielding layer comprises a tinned copper wire woven mesh; the sheath layer is a thermoplastic polyurethane matrix, a microcapsule self-repairing agent is dispersed in the thermoplastic polyurethane matrix, a microcapsule comprises a siloxane prepolymer, and the thermoplastic polyurethane matrix further comprises graphene nanosheets. Through collaborative design of the fractal stranded conductor layer, the dynamic skeleton support layer, the shielding layer and the self-repairing sheath, comprehensive improvement of cable performance is realized.

The invention discloses a high-performance copper alloy pipe and a preparation method thereof. The Sn, Ni and P elements are compositely added into Cu, the content and proportion of all the elements are regulated and controlled, meanwhile, a recrystallization treatment process is combined, a high-proportion sigma 3, sigma 9 and sigma 27 coincidence lattice grain boundary is introduced, and the copper alloy pipe with high strength, high machining forming capacity and excellent pressure resistance, corrosion resistance and high-temperature softening resistance is prepared. Meanwhile, Zr, Co and B (optionally) elements are added on the basis of the alloy components, so that the performance of the copper alloy pipe is further improved. The tensile strength, the processing formability, the pressure resistance, the corrosion resistance and the high-temperature softening resistance of the copper alloy pipe are far better than those of a TP2 copper pipe of the same specification and an existing high-strength copper pipe, the performance requirements of the high-pressure-resistance thin-wall seamless copper pipe are met, and the copper alloy pipe has wide application prospects in the heat exchange field.

The invention relates to the technical field of tin-containing copper alloy manufacturing, in particular to a method, system and equipment for detecting the oxygen content of copper alloy melts.The method comprises the steps that resistivity data of the copper alloy melts.The temperature data of the copper alloy melts.The resistivity data of the copper alloy melts.The temperature data of the copper alloy melts.The resistivity data of the copper alloy meltsare acquired in real time; the resistivity data are corrected based on the temperature data, and standardized resistivity irrelevant to the temperature is obtained; a correlation model of the resistivity and the oxygen content is established according to the linear influence relation of oxygen impurities in the copper alloy melt on the resistivity, a real-time oxygen content value is output based on the standardized resistivity, and an oxygen content fluctuation trend is generated; and according to the real-time oxygen content value and the oxygen content fluctuation trend, the oxygen content tolerance threshold value of the copper alloy melt is dynamically adjusted based on the oxygen sensitivity requirements of different alloying stages. By means of the method, the problems that in a traditional oxygen content detection method, due to the fact that temperature distribution is uneven, alloy element interaction and solidification behaviors are not systematically modeled, the detection precision is low, and microstructure control fails are effectively solved.

The invention provides a machining method and tool for a high-precision thin-wall casing of an aero-engine, and belongs to the field of precision machining of thin-wall components of aero-engines. Comprising a clamp body which is provided with a hoisting hole and supporting plate mounting positions distributed in the circumferential direction. The inner-layer clamping mechanism and the outer-layer clamping mechanism are composed of supporting plates distributed along the circumference of the clamp body, each supporting plate is longitudinally provided with a plurality of sets of ejector rods, the ejector rods are locked through ejector rod installation nuts, and the tail ends of the ejector rods are provided with copper alloy ejector rod heads; the outer layer clamping mechanism comprises a pressing plate used for axially pressing the end face of the casing. The support plate is provided with three groups of upper, middle and lower ejector rod screw-thread fit holes. The tool not only has the part positioning function and the clamping space meeting the requirement that rough machining and finish machining of the cartridge receiver can share the same tool, but also has the functions of internal and external multi-point independent supporting and internal and external multi-point simultaneous supporting. According to the technological method, two times of heat treatment is added to remove stress generated by cutting machining, and two numerical control lathe finish machining procedures are refined into seven procedures.

The invention provides a dynamic control method and system for hot-pressing plugging process parameters of a network cable end electronic wire, which realizes real-time optimization of the process parameters through a dynamic compensation technology, dynamically calculates an initial heating temperature and a riveting depth based on a wire diameter, an insulating layer thickness, a copper alloy hardness and an environment temperature, and realizes the hot-pressing plugging process parameters of the network cable end electronic wire. A compensation formula is combined with a conductor diameter compensation coefficient, a hardness compensation coefficient and an environment temperature compensation coefficient, heating temperature fluctuation and riveting pressure displacement deviation are monitored in real time, Z-axis displacement is adjusted by controlling a servo motor, a temperature-pressure coupling compensation model is established, and heating power and riveting pressure are dynamically corrected. And the online quality detection module corrects subsequent batch parameters in a self-adaptive manner at a learning rate eta = 0.2 through continuous five batches of data, so that the riveting depth precision and the connection strength are ensured to reach the standard, intelligent dynamic control of the hot-pressing plugging process is realized, and the product percent of pass and the production efficiency are improved.

The invention relates to the technical field of chip heat dissipation, and discloses a bare chip cooling fin and an installation method thereof, and the cooling fin comprises a heat dissipation substrate, through hole supporting columns, a mixed fixing assembly and a heat dissipation fin array. The heat dissipation substrate is made of high-thermal-conductivity copper alloy, and the surface of the heat dissipation substrate is plated with a nano oxide layer to improve the heat radiation efficiency; the height of the through hole supporting column is matched with that of elements around the chip, and the bottom is provided with an anti-skid rubber pad to prevent installation inclination and buffer mechanical stress; the mixed fixing assembly comprises screw fixing holes distributed diagonally and plastic buckle fixing holes distributed diagonally, a plastic buckle can rotate by 0-90 degrees, a limiting spring is arranged in the plastic buckle to provide tactile feedback, and rapid installation and damage-free disassembly are achieved; the radiating fin array adopts a gradient height design, is matched with heat source distribution of the chip and optimizes an airflow channel. Through the dual-redundancy fixing structure and the gradient heat dissipation design, the heat dissipation efficiency and the installation reliability are remarkably improved, and the heat dissipation device is suitable for high-vibration and high-heat-dissipation-demand scenes such as data centers and automatic driving.

The invention discloses a five-axis hollow positioner device, which relates to the technical field of welding auxiliary equipment and comprises a rotating main body, an L-shaped positioner, a welding chuck and a chuck driving and clamping mechanism, the rotating main body comprises a main box body, a rotating base and a first slewing mechanism, and the main box body can rotate around the first slewing mechanism; the two L-shaped position changing machines are symmetrically arranged on the two sides of the main box body to form double stations, and welding and feeding are synchronous. The welding chuck is arranged on the L-shaped positioner through a third slewing mechanism and is used for clamping and driving the workpiece to rotate; the chuck driving and clamping mechanism controls the welding chuck to clamp / loosen; the device realizes five-axis movement, can flexibly adjust the welding posture of a workpiece, and eliminates welding dead angles; the double-station design improves the efficiency, the arc light prevention blocking screen guarantees the safety, the copper alloy clamping pad prevents the workpiece from being scratched, and the device is suitable for efficient welding of complex workpieces.

The invention relates to the technical field of power monitoring, and discloses a high-temperature-resistant gold-copper alloy cable abnormity monitoring system based on big data analysis, which comprises a data monitoring module, a monitoring analysis module, a monitoring evaluation module and an early warning feedback module, the data monitoring module is composed of an operation condition monitoring unit, a working state monitoring unit and an environment monitoring unit, performs data monitoring integration on an operation data set, a state data set and an environment data set, and then comprehensively analyzes and calculates an operation abnormal index, a state abnormal index, an environment interference index and a comprehensive abnormal value. And finally, comprehensive evaluation is carried out according to the comprehensive abnormal index, so that the abnormal condition of the cable is analyzed in a multi-dimensional manner, potential problems can be identified more accurately, early warning is realized, sudden faults and increase of maintenance cost are avoided, data consistency is maintained, data reliability is improved, misjudgment is avoided, errors are reduced, and the like.

The invention discloses an ultrahigh-strength collision energy absorption aluminum-magnesium-silicon-copper alloy profile and a preparation method thereof. The ultrahigh-strength collision energy absorption aluminum-magnesium-silicon-copper alloy profile is prepared from, by mass, 1.2%-1.4% of Si, smaller than or equal to 0.2% of Fe, 0.50%-0.80% of Cu, 0.50%-0.8% of Mn, 1.0%-1.3% of Mg, 0.15%-0.20% of Cr, smaller than or equal to 0.20% of Zn, 0.01%-0.05% of Ti, smaller than or equal to 0.20% of V, 0.10%-0.20% of Zr, smaller than or equal to 0.05% of other single impurities, smaller than or equal to 0.10% of total impurities and the balance Al. Through strict limitation of chemical components, impurity and gas contents and homogenization, extrusion and heat treatment systems, the aluminum alloy has excellent transverse and longitudinal collision energy absorption performance under the condition of sufficient strengthening, the yield strength of the aluminum alloy is larger than 360 MPa, the tensile strength is 390-430 MPa, the transverse bending angle is larger than or equal to 75 degrees, the longitudinal bending angle is larger than or equal to 65 degrees, and the tensile strength is larger than or equal to 390 MPa. After 60% of axial compression, no through crack larger than 10 mm occurs; and meanwhile, the dual requirements of light weight and safety of the automobile are met.

The invention discloses a copper alloy and a preparation method and application thereof, and belongs to the technical field of alloys. The copper alloy comprises the components of Cu, Al, Cr, Zr, Ni, Mg, Ti, Si, rare earth elements, Zn and the like, through the innovative design of Al-Cr-Si oxidation film synergistic protection, Zr-Ti-Mg nanophase strengthening, rare earth grain boundary purification and the like of the copper alloy, the breakthrough improvement of the high-temperature strength, the complex corrosion resistance, the machining performance and the environmental protection performance is achieved through the combination of the low-burning-loss smelting, rapid solidification and multi-stage heat treatment processes, and the copper alloy can be used for manufacturing the high-temperature-resistant alloy. The copper alloy can be widely applied to the fields of aerospace high-temperature parts, ocean engineering corrosion-resistant structural parts, high-end die-casting dies and the like, and fills the blank of the existing copper alloy technology.

The invention belongs to the technical field of permanent magnetization remanufacturing, and particularly relates to a permanent magnetization regeneration method for a waste motor of copper alloy wire processing equipment, and the method comprises the steps: disassembling a waste asynchronous motor, and reserving a case, a stator, a rotor core and a rotating shaft which are not damaged; the specifications of the air injection channels are determined according to the diameter of the rotating shaft, more than two air injection channels are arranged on the rotating shaft at equal-angle intervals, and then the rotating shaft is installed in the machine shell; the rotor core is split to obtain steel sheets, and permanent magnet grooves, magnetic isolation air grooves and air injection channel grooves are formed in the steel sheets; the permanent magnets are assembled in the permanent magnet grooves, then the steel sheets are laminated according to a first rule to obtain a rotor, and then the rotor is assembled to the rotating shaft; a rear end cover of the machine shell is removed, a heat dissipation machine cover is manufactured according to the diameter of the rear end cover, a bearing groove and an air outlet hole are formed in the heat dissipation machine cover, and then the heat dissipation machine cover is assembled to the machine shell; and a frequency converter is additionally arranged on the shell. The remanufactured permanent magnet synchronous motor manufactured by the method has better sealing performance and heat dissipation performance.

The invention relates to a preparation method of beryllium-copper alloy. The preparation method comprises the following steps: (S1) accurately weighing the following raw materials by mass: copper, beryllium, copper-yttrium alloy, copper-titanium alloy, copper-manganese alloy and nano ytterbium powder; (S2) the raw materials are added into a vacuum induction furnace, the temperature is increased to 1400-1600 DEG C under the inert atmosphere, after the raw materials are completely molten, a covering agent is spread on the melt, smelting, standing and slagging-off are conducted under the stirring condition, the melt is poured into a mold under the condition of 1100-1200 DEG C, and a beryllium copper alloy ingot is obtained; and (S3) the beryllium-copper alloy ingot is subjected to face milling treatment, solution treatment, cold machining deformation treatment and aging treatment in sequence, and the product beryllium-copper alloy is obtained. A small amount of metal elements are added, aging treatment is carried out under the microwave condition, and then slow cooling is carried out at the constant cooling rate, so that the overaging phenomenon can be remarkably inhibited, the hardness of the alloy is improved, and meanwhile, the mechanical property, especially the stress relaxation resistance, is also improved.

The invention discloses a copper pipe blank horizontal continuous casting process optimization method based on machine learning assistance, and relates to the technical field of copper and copper alloy pipe blank horizontal continuous casting. The method comprises the steps of S1, data collection, S2, model construction, S3, hyper-parameter optimization, S4, model training and verification, S5, effect evaluation and S6, prediction and optimization of process parameters. A new particle swarm optimization algorithm is used for optimizing a neural network prediction model, the neural network prediction model is applied to the horizontal continuous casting process, the accuracy and the reliability are remarkably improved after the model is optimized, an online rapid calculation system, the particle swarm optimization algorithm and a multi-layer neural network model are combined, crystalline region parameters are accurately predicted and controlled, and the continuous casting quality is improved. Data obtained by an existing rapid calculation system has certain limitation, process parameters obtained based on a production field and crystallization position parameters under a corresponding mold are continuously added into a model training database, and prediction data are more accurate and closer to the current production situation.

The invention provides a lithium supplement composite layer and a preparation method thereof, a lithium supplement method, a pre-lithiated negative pole piece, a secondary battery and an electronic device, the lithium supplement composite layer comprises an interface layer and a lithium supplement layer which are laminated, the interface layer comprises interface particles and a binder, the interface particles comprise a lithium intercalation material and / or a conductive agent, and the binder comprises a lithium intercalation material and / or a conductive agent. The lithium intercalation material is selected from at least one of artificial graphite, natural graphite, hard carbon, a silicon-carbon material, a silicon-oxygen material, lithium titanate, tin and a tin-copper alloy, and the conductive agent is selected from at least one of conductive carbon black, carbon fiber, graphene and a carbon nanotube; the binder is selected from at least one of polytetrafluoroethylene, an ethylene-tetrafluoroethylene copolymer, a tetrafluoroethylene-hexafluoropropylene copolymer, polyvinylidene fluoride and polyoxyethylene; the lithium supplementing layer comprises lithium metal and / or lithium alloy. The lithium supplement composite layer meets the above characteristics, lithium supplement is carried out on the negative pole piece, the first coulombic efficiency of the secondary battery can be improved, the cycle capacity attenuation is reduced, and the energy density of the secondary battery is improved.

The invention discloses a manganese-copper alloy with high damping performance and a preparation method and application thereof. The preparation method comprises the steps that manganese-copper alloy powder is subjected to laser layer-by-layer scanning printing through a laser powder bed melting technology, and then the printed manganese-copper alloy is subjected to direct aging treatment. Obtaining a result parallel to the construction direction by regulating and controlling printing processes such as a laser scanning strategy, a layer thickness, a scanning interval and a substrate temperature; 001gt, 001gt; and the manganese-copper alloy is manufactured through strong texture additive manufacturing. Owing to lt; 001gt, 001gt; the oriented grains have more twin-crystal martensite variants, and twin-crystal martensite is easier to move under the action of external stress, so that the manganese-copper alloy has higher damping performance. The vibration reduction component is prepared by utilizing the special advantages of forming hollow, hollow-out, thin-wall and other complex structures of laser additive manufacturing, combination of manganese-copper damping alloy material vibration reduction and structure vibration reduction can be effectively achieved, and the manganese-copper damping alloy material can be widely applied to the field of vibration reduction and noise reduction of satellites, ships, rail transit, high-precision machine tools and other high-end equipment.

The invention relates to the technical field of metal surface engineering, and discloses a laser cladding layer based on copper-magnesium-titanium-zirconium gradient design and a preparation method thereof.The preparation method comprises gradient structure design, a microstructure strengthening mechanism, a laser cladding process and thermal field control. By constructing a copper-magnesium-titanium component gradient transition structure and matching the thermal expansion coefficient difference between a matrix and a coating in real time, interface thermal stress accumulation can be dynamically inhibited, the crack defect caused by thermal expansion mismatch of a traditional cladding layer is avoided, ordered diffusion of elements at the interface is promoted through gradual change of gradient components, and the thermal conductivity of the cladding layer is improved. The metallurgical bonding reliability of the coating and a base body is improved, meanwhile, a stable coating is formed, the long-term service stability under the extreme working condition is guaranteed, a microstructure strengthening mechanism regulation and control means is adopted, the coating has a stable and effective protective barrier in a corrosive medium environment, and the problem of performance degradation caused by structure defects of a traditional cladding layer is solved.

The invention discloses an efficient heat dissipation system of a new energy automobile circuit board, and the system comprises a composite heat dissipation substrate which is formed by compounding a ceramic substrate layer, a graphene heat conduction layer and a copper alloy supporting layer through vacuum hot pressing, and the surface of the graphene heat conduction layer is provided with a micron-sized groove array; the dynamic heat dissipation assembly comprises a thermoelectric refrigeration module and a temperature sensor which are embedded in the composite heat dissipation substrate, the thermoelectric refrigeration module is linked with the temperature sensor through a PID controller, and active refrigeration based on temperature rise of the circuit board is achieved; the multi-layer heat dissipation channel comprises a micro-channel and a bionic fin structure, the micro-channel vertically penetrates through the composite heat dissipation substrate, the bionic fin structure covers the surface of the substrate, and the micro-channel is filled with a phase change material and is communicated with an external liquid cooling circulation system; the airflow adjusting module comprises a rotatable flow guide plate and a piezoelectric fan array, the flow guide plate dynamically adjusts the heat dissipation airflow direction according to the vehicle speed, and the frequency response range of piezoelectric fans is larger than or equal to 100 Hz.

The invention discloses an electromagnetic shielding method for a high-density integrated wireless audio module, and the method comprises the steps: employing a metal material with good conductivity and corrosion resistance, such as aluminum alloy and copper alloy, to cover the outer surface of the module, and enabling the outer metal shielding layer to be used for isolating external electromagnetic interference; the thickness of the outer metal shielding layer is generally 0.3 mm to 1 mm, it is ensured that external electromagnetic radiation can be effectively reflected or absorbed, and the outer metal shielding layer is located between the outer metal shielding layer and the inner conductive coating and is made of a material with high-frequency absorption performance, such as a ferrite material, a conductive polymer or a carbon-based material. The thickness of the wave-absorbing layer can be designed according to the electromagnetic characteristics of a working frequency band and is generally 0.5 mm to 2 mm, so that high-frequency noise can be effectively attenuated. By adopting a multi-layer shielding structure and an intelligent heat dissipation design, electromagnetic interference is effectively reduced, miniaturization and light weight of the wireless audio module are maintained, and compared with the prior art in which a large number of expensive shielding materials are needed, the wireless audio module has the advantages that the selection of the shielding materials and the intelligent heat dissipation design are optimized.

The invention relates to the technical field of metal wire processing, discloses copper alloy fine wire drawing equipment, and solves the problems that in the multi-stage drawing process of copper wire drawing equipment, due to the fact that the initial diameter of a raw material copper wire is uneven and the variation of unit length increase is unstable due to wire diameter fluctuation in the drawing process, the tension of the copper wire on a guide wheel is frequently changed, and the drawing quality is influenced. Therefore, the tension thread breaking phenomenon is easily caused. The first deformation structure is located between the outer guide wheel and the assembly disc, in the copper wire drawing process, adaptive deformation can be generated according to wire diameter changes, the outer guide wheel is pushed through reverse elastic force of the elastic recovery trend of the first deformation structure, and the fluctuation variation of increase of the unit length of the copper wire is self-adapted.

The invention relates to the technical field of copper alloys, in particular to a high-conductivity wear-resistant copper alloy and a preparation method and application thereof. A high-conductivity wear-resistant copper alloy comprises, by mass, 3-6% of nickel, 2-5% of tin, 1-3% of zinc, 0.1-0.5% of a rare earth element, 0.8-1.2% of a carbon nanotube-copper intermediate alloy and the balance copper, the rare earth element is one of cerium and lanthanum, the conductivity of the high-conductivity wear-resistant copper alloy is larger than or equal to 94% IACS, and the Vickers hardness of the high-conductivity wear-resistant copper alloy is larger than or equal to 120 HV. By regulating and controlling the mass ratio of nickel (Ni) to tin (Sn), adding the rare earth element and the carbon nanotube-copper intermediate alloy and accurately controlling the preparation process, the conductivity, wear resistance and mechanical property of the copper alloy material are remarkably improved, and the copper alloy material has wide application prospects in the fields of power transmission, high-speed transportation, ocean engineering and the like.

The invention discloses a copper alloy wire heat treatment deformation detection method, and relates to the technical field of copper alloy wire detection, and the method comprises the following steps: transmitting a to-be-detected wire; performing laser irradiation and information receiving; processing and analyzing electric signals; real-time self-inspection of the laser measurement equipment is carried out; and vibration correction. According to the heat treatment deformation detection method for the copper alloy wire, an amplitude sensor senses and feeds back amplitude data during shaking, and after the amplitude data is processed, the influence of each vibration amplitude on deformation detection calculation of a wire body can be learned by adopting a neural network and a deep learning model; the influence value caused by each vibration amplitude is substituted into the deformation calculation of the wire rod body, so that the detection part when the wire rod body vibrates can be calculated and corrected, and the situation that the deformation calculation result of the wire rod body is inaccurate and secondary detection is needed due to vibration is avoided.

The invention discloses a high-heat-resistance and high-conductivity copper alloy and a preparation method and application thereof. The copper alloy comprises 0.001 wt%-0.01 wt% of Ag; the content of P is 0.0005 wt%-0.002 wt%; the copper alloy comprises the following components in percentage by weight: 0.003 to 0.008 percent of X and the balance of Cu and impurities. The preparation process of the high-heat-resistance and high-conductivity copper alloy comprises the steps of smelting, casting, continuous extrusion, solid solution treatment, drawing, low-temperature annealing, sizing and packaging. The preparation method comprises the following steps: proportioning and smelting according to the mass percent of each element of the copper alloy; and in the low-temperature annealing process, the annealing temperature is 150-350 DEG C, and the heat preservation time is 2-10 h.

The invention belongs to the technical field of radiators, and particularly relates to a radiator for a power semiconductor and an assembling method thereof. The radiator comprises a heat dissipation bottom plate, a heat dissipation plate and a heat dissipation shell, the heat dissipation bottom plate is used for connecting the power semiconductor device and the heat dissipation plate, the heat dissipation bottom plate and the heat dissipation plate form a heat dissipation bottom plate-heat dissipation plate combination body through a vacuum brazing or pressure sintering process, and the heat dissipation bottom plate-heat dissipation plate combination body is reliably connected with the heat dissipation shell; the heat dissipation bottom plate is made of a material with a thermal expansion coefficient similar to that of the power semiconductor device; a window is arranged on the heat dissipation bottom plate, a protruding part is arranged at the position, corresponding to the window, of the heat dissipation plate, and the protruding part of the heat dissipation plate penetrates through the window to make contact with the power semiconductor device. According to the radiator, the titanium alloy or the tungsten copper alloy with the thermal expansion coefficient similar to that of the power semiconductor device is adopted as the heat dissipation bottom plate, and the protruding parts on the heat dissipation plate penetrate through the windows of the heat dissipation bottom plate to be in direct contact with the power semiconductor device, so that the heat dissipation efficiency can be improved.

The invention relates to a copper-titanium alloy and a preparation method thereof, and belongs to the technical field of copper alloy materials. The preparation method of the copper-titanium alloy comprises the following steps that a copper-titanium alloy blank is sequentially subjected to homogenization treatment, hot rolling, solution treatment, cold rough rolling, first-time aging treatment, cold finish rolling and second-time aging treatment, and the copper-titanium alloy is obtained. According to the preparation method of the copper-titanium alloy, hot rolling and cold rolling are adopted for plate forming, the combined aging process and the pre-aging, cold rolling and aging production process are adopted, and the content of beta '-Cu4Ti phases in the copper-titanium alloy plate is remarkably increased by means of coordination and complementation of all the steps; the copper-titanium alloy can have good electrical conductivity and mechanical performance at the same time.

The invention provides a method for improving the high-temperature crack resistance of a cupronickel alloy based on addition of an alterant, which comprises the following steps: S1, heating a cupronickel alloy raw material until the cupronickel alloy raw material is completely molten; s2, scum in the metal solution is fished out; s3, adding a copper-magnesium alloy; s4, adding pure titanium, and fully melting and reacting the pure titanium through stirring; s5, scum in the metal solution is fished out; s6, casting after the furnace front analysis is qualified; s7, obtaining a cupronickel alloy round ingot or flat ingot; the copper-magnesium alloy is added as a deoxidizing agent, so that the oxygen content of a metal solution can be reduced, oxygen is prevented from reacting with alloy elements to generate inclusions, the purity of the alloy is improved, and the crack resistance of the alloy is enhanced; the fine and uniform grain structure can effectively improve the high-temperature plasticity of the cupronickel alloy, reduce grain boundary defects, improve the high-temperature crack resistance of the cupronickel alloy and avoid cracking under high-temperature forging or hot rolling.

The invention relates to the technical field of dissimilar metal connection, in particular to a copper-steel bimetal piece with a complex inner runner and a preparation method thereof.The preparation method comprises the steps that a cooling runner is preprocessed through a copper alloy blank, and a primary copper alloy workpiece is obtained; the primary copper alloy part is cleaned, and a secondary copper alloy part is obtained; the stainless steel blank is subjected to surface treatment and cleaning, and a stainless steel workpiece is obtained; the secondary copper alloy workpiece and the stainless steel workpiece are assembled and then are arranged in a sheath; the sheath is heated and vacuumized and then is sealed and welded; carrying out hot isostatic pressing treatment on the sealed and welded sheath to obtain an intermediate part; and the steel ladle sleeve outside the middle part is removed, and the copper-steel bimetal part is obtained. According to the method, the phenomena of generation of brittle intermetallic compounds on the interface and grain coarsening are avoided, the connection strength is remarkably improved, interface metallurgical bonding and high-precision shape control of a cooling runner are synchronously completed in a single process, and the geometric precision of the copper-steel bimetal part is guaranteed.

The invention provides a low-temperature circular welding strip and a preparation method thereof.The method comprises the steps that burdening is conducted according to alloy compositions, and a copper alloy blank is obtained through smelting and continuous casting; carrying out homogenization treatment on the copper alloy blank, namely heating to a copper alloy homogenization temperature and carrying out heat preservation; the blank obtained after heat preservation is subjected to descaling and then is continuously rolled till the target diameter is reached, and a semi-finished wire is obtained; and carrying out surface coating treatment and post-treatment on the semi-finished wire rod to obtain a finished low-temperature circular welding strip. Corrosion resistance and welding reliability can be enhanced, and the method is suitable for efficient and stable connection of photovoltaic modules.

A copper alloy bonded body composed of a plurality of members made of an age-hardenable copper alloy, the members diffusion-bonded to one another. The copper alloy bonded body has undergone solution annealing and an aging treatment, the content of beryllium in the age-hardenable copper alloy is 0.7% by weight or less, and (i) a bonding interface between the members has disappeared and / or (ii) a bonding interface between the members remains, and an oxide film at the bonding interface has a thickness of 0 nm or more and 5.0 nm or less.

The invention relates to the technical field of alloys, and discloses a high-strength silver-copper alloy and a preparation method thereof. The acidified carbon nanotubes are subjected to functional modification, methylbenzene-2, 4-diisocyanate reacts with surface active groups of the methylbenzene-2, 4-diisocyanate to introduce-NCO groups, then through hydroxyl reaction of-NCO and 4-hydroxyphthalic acid, a plurality of carboxyl groups are grafted on the surfaces of the carbon nanotubes, the carboxyl groups can firmly adsorb lanthanum nitrate through a coordination effect, and meanwhile, the carboxyl groups can also adsorb lanthanum nitrate through a coordination effect. The rare earth elements are prevented from being separated from the raw materials in the ball milling process, uniform distribution is ensured, the agglomeration tendency of the carbon nanotubes can be reduced, and the dispersity of the carbon nanotubes in the silver-copper alloy is improved; the carbon nanotubes have extremely high axial strength and excellent conductivity, the mechanical and electrical properties of the alloy material can be enhanced through load transfer and a conductive network effect, rare earth lanthanum is segregated at a grain boundary to form a pinning effect to refine grains, the alloy strength is further improved, and finally collaborative improvement of the strength and the conductivity of the silver-copper alloy is achieved.

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.