1925 results about "Copper alloy" patented technology

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 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 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 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 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 relates to the technical field of medical instruments, discloses a surgical instrument, and particularly relates to a shapeable surgical instrument suitable for single-port endoscopic surgery, which comprises an inner rod assembly, an outer rod assembly and a handle assembly. The outer rod assembly is made of annealed metal (such as pure copper or copper alloy), can be shaped by hands and is kept in a bent form; the inner rod is a nickel-titanium alloy multifilament or a stranded rope, and low-resistance rotation in a bending state is achieved. The handle rotating wheel drives the inner rod to rotate and is matched with the axial push-pull of the rear handle, so that the 360-degree real-time angle adjustment and opening and closing actions of the working part (forceps piece / scissors) are controlled by a single hand, and the forceps piece / scissors do not need to be taken out of a body. The problems that a traditional straight rod instrument cannot reach a narrow area, a pre-bending instrument cannot be adjusted in an operation, and an existing shaping instrument needs in-vitro angle adjustment of two hands are solved, the operation efficiency is improved, and the cleaning and sterilizing time is shortened.

The invention relates to the technical field of material surface quality nondestructive testing, and discloses a rapid identification method for surface microdefects of a copper alloy strip, which comprises the following steps: firstly, applying a specific time sequence thermal excitation sequence to a surface to be detected, the sequence comprising a state pre-excitation pulse for inducing nonlinear response of thermal physical properties of a material; secondly, synchronously acquiring whole-process dynamic thermal response under the action of thermal excitation, and constructing a thermal response data cube; thirdly, extracting a time-temperature response curve for each pixel point in the data cube, and calculating a multi-dimensional dynamic thermodynamic feature vector; and finally, inputting the feature vector into a pre-trained supervised learning classification model to obtain a pixel-level classification label, and performing post-processing to determine the type, position and size of the defect. According to the method, the nonlinear and spectral response difference of the material is deeply excavated, the feature vector with high discrimination degree is constructed, and the detection sensitivity and classification accuracy of micron-sized physical and chemical defects can be effectively improved.

The invention discloses a corrosion-resistant copper alloy pipe. The corrosion-resistant copper alloy pipe comprises the following components in percentage by mass: 0.05-0.40% of P, 0.001-0.1% of X, and the balance of Cu and inevitable impurities, wherein the X is selected from at least one of Al, Ni or RE; in the structure of the copper alloy pipe, the volume fraction of the small-angle grain boundary is 40-65%, and the volume fraction of the large-angle grain boundary is 25-50%. The copper alloy pipe has good corrosion resistance and oxidation resistance, and meanwhile beneficial bending, flaring, welding and pressure resistance are guaranteed. The invention further discloses a preparation method of the copper alloy pipe. The technological process of the preparation method comprises the steps of smelting, casting, face milling, rolling, stretching, rewinding and secondary annealing. Wherein the secondary annealing temperature is 350 to 580 DEG C, and the annealing time is 0.5 to 3.5 hours. The invention further discloses application of the copper alloy pipe and the copper alloy pipe prepared through the preparation method to preparation of a heat conduction pipe of an air conditioner heat exchanger, an air conditioner indoor and outdoor unit connecting pipe or a built-in pipe or a pipe assembly.

The invention provides a method for welding copper and copper alloy, which comprises the following steps of: obtaining a substrate which is made of copper or copper alloy, and cleaning and drying one surface of the substrate as a cladding surface; a FeCoCrNi high-entropy alloy cladding layer is prepared on the cladding face through a powder feeding laser cladding technology, the FeCoCrNi high-entropy alloy cladding layer comprises a first layer and a second layer which are sequentially stacked on the cladding face, and the laser power of the first layer is higher than that of the second layer; and cutting composite samples with the FeCoCrNi high-entropy alloy cladding layers from the clad substrate, and performing butt welding on the FeCoCrNi high-entropy alloy cladding layers of the two composite samples by adopting a laser swing welding technology. According to the invention, an innovative technical solution can be provided for obtaining high-performance and high-reliability copper and copper alloy welding joints.

The invention provides a zinc-copper-nickel-copper smelting deslagging agent and a preparation method and a use method thereof. The zinc-copper-nickel-copper smelting deslagging agent comprises the following raw materials in percentage by mass: 5-15% of calcium fluoride, 20-30% of sodium carbonate, 5-15% of sodium fluoride, 10-20% of sodium hexafluoroaluminate and the balance of borax. Compared with the prior art, the zinc-copper-nickel-copper slag remover prepared by mixing the raw materials can effectively reduce impurities to be less than 0.14% of Fe, less than 0.005% of Pb and less than 0.003% of Si in the smelting process, the impurity components are obviously reduced, the number of times of component adjustment and unqualified sampling is reduced, impurities mixed in a casting blank are reduced, and finally the metal purity and the casting quality are improved. Meanwhile, loss of zinc and nickel is reduced to the maximum extent; and adverse effects on the zinc-copper-nickel alloy are avoided.

The invention discloses a graphene reinforced copper alloy bar and a preparation method thereof, and belongs to the technical field of copper alloys. The preparation method comprises the following steps: preparing a Cu-C master alloy bar; the first copper strip penetrates through a graphite box body, the surface of the first copper strip is covered with a layer of graphene, and the graphene on the surface layer is thinned and evenly coated through a polishing wheel; the treated first copper strip is wound on a Cu-C master alloy rod, sealing welding is conducted on the side face, the two ends are sealed and covered with copper materials, and a first copper roll is obtained; and the copper roll is subjected to equal-channel angular extrusion treatment, repeated extrusion and drawing are conducted, and the graphene reinforced copper alloy bar is obtained. According to the preparation method of the graphene reinforced copper alloy bar, graphene copper (Cu-C mother alloy) is put into a core part of a copper strip coil coated with graphene, then vacuum seal welding is carried out, equal-channel angular extrusion is utilized, so that the graphene can be uniformly distributed, the process is simplified, the efficiency is improved, and rapid mass production is realized at low cost.

The invention relates to a Cu-Ni-Fe-Si-based copper alloy sheet material, a method for producing the same, an energizing member, and a heat dissipation member. The purpose of the present invention is to improve punching properties while maintaining good bending workability in a Coesson-based copper alloy sheet material having a strength and electrical conductivity level range having excellent versatility. A copper alloy sheet material having a chemical composition containing, in mass%, 1.00-4.00% of Ni, 0.10-2.00% of Fe, 0.20-1.20% of Si, 0.005-0.10% of S, and 0.005-1.00% in total of one or more elements selected from Mo, Cd, Ti, Mn, Be and Al, and optionally containing Ag, B, Co, Cr, Nb, P, Sn, Zn, Zr and a rare earth element, the remainder comprising Cu and unavoidable impurities, the number density of particles containing Ni, Fe and Si and having major diameters of 0.05-1.0 [mu] m being 1.0 * 104 particles / mm2 or more, and the balance being Cu and unavoidable impurities. The number density of S-containing particles having a major diameter of 3.0 [mu] m or more is 100 particles / mm2 or less.

A Cu-Fe-P-based copper alloy having a composition containing 1.5 mass% or more and 2.7 mass% or less of Fe, 0.008 mass% or more and 0.20 mass% or less of P, 0.01 mass% or more and 0.5 mass% or less of Zn, 0.01 mass% or more and 0.5 mass% or less of Sn, and the balance of Cu and unavoidable impurities, the conductivity in the direction parallel to the longitudinal direction being more excellent than the conductivity in the direction orthogonal to the longitudinal direction. The ratio [sigma] P / [sigma] O between the electrical conductivity [sigma] P measured in a direction parallel to the longitudinal direction and the electrical conductivity [sigma] O measured in a direction orthogonal to the longitudinal direction is greater than 100.1% and 105.0% or less, and when precipitate particles having a particle diameter of 150 nm or more and less than 1000 nm observed in a cross section including the longitudinal direction are used as objects, the particle diameter of the precipitate particles is less than or equal to 10 [sigma] P / [sigma] O, and the particle diameter of the precipitate particles is less than or equal to 10 [sigma] P / [sigma] O. The average value of the ratio LO / LP between the particle length LO in the direction orthogonal to the longitudinal direction and the particle length LP in the direction parallel to the longitudinal direction is 0.8 or less.

The invention belongs to the technical field of metal-based composite materials, and particularly relates to a method for integrally preparing complex-shaped tungsten-copper alloy through injection molding and sintering, which comprises the following steps: mixing and preheating tungsten powder and copper powder; preparing a composite plasticizer matrix, mixing and granulating to obtain a granular mixed material; injecting the granular mixed material into a cavity of a steel mold through an extruding machine at the temperature of 150-200 DEG C; cooling and demolding to obtain a molded blank; the obtained formed blank is heated to 800-900 DEG C at the heating speed of 100-200 DEG C / h, and presintering is conducted for 1-2 h; and the pre-sintered formed blanks are arranged in a graphite boat at intervals, landfill and compaction are carried out through emery, then the formed blanks are heated to 1400-1450 DEG C, heat preservation is carried out for 2-2.5 h, and sintering and post-treatment are carried out. The method provided by the invention effectively solves the technical problems that an infiltration link is needed in a traditional production mode of the material, the material is not uniform, the mechanical and electrical properties are low, and a complex structure is difficult to directly form.

The invention relates to a preparation method of a high-strength and high-conductivity copper alloy wire, which comprises the following steps of: performing gradient extrusion and extrusion under a high-temperature condition to obtain a copper rod with a uniform and fine equiaxed crystal structure; performing large-deformation extrusion under medium and low temperature conditions to obtain a copper rod with a streamline fibrous structure; and carrying out multi-pass drawing treatment to obtain the copper alloy wire which is in a long and thin fiber structure along the radial direction. The copper alloy wire has high tensile strength and high conductivity, and the contradiction that in the prior art, a copper alloy wire cannot meet high strength and high conductivity at the same time is solved.

The invention belongs to the technical field of copper alloys, and particularly relates to a method for regulating and controlling a copper alloy texture through gradient temperature control deformation. The method for regulating and controlling the copper alloy texture through gradient gradient temperature control deformation comprises the following step that gradient gradient temperature control deformation is conducted on a copper-based material. According to the method, the texture type and distribution can be effectively regulated and controlled, and the Brass texture content is greatly reduced; in addition, by means of the method, the content of the Y texture beneficial to plasticity can be increased, and the plastic deformation capacity of the copper alloy is greatly enhanced on the basis that the strength of the copper alloy is kept.

The invention provides a copper-nickel-tin alloy strip and a preparation method thereof, and relates to the technical field of copper alloys. The copper-nickel-tin alloy strip provided by the invention comprises the following components in percentage by mass: 8.5%-10% of Ni, 1.5%-3% of Sn, 0.5%-1.5% of Al, 0.3%-0.6% of Si, 0.19%-0.21% of Cr, 0.05%-0.30% of Mn and the balance of Cu. The tensile strength of the copper-nickel-tin alloy strip ranges from 580 MPa to 770 MPa, the percentage elongation after fracture A50 is larger than or equal to 8%, the hardness ranges from 170 HV to 240 HV, the electric conductivity is larger than or equal to 10% IACS, and the grain size is smaller than or equal to 0.015 mm. And the material can be stably applied to elastic sensitive elements of electronic industrial relays, potentiometers, switches, connectors, lead frames, control and instrument sensors and the like.

The invention discloses a high-strength and high-plasticity copper alloy and a preparation method thereof. The high-strength and high-plasticity copper alloy is prepared by mixing Cu-Al pre-alloyed spherical powder and CuO powder according to the mass ratio of (100-150): 1, wherein the Cu-Al pre-alloyed spherical powder and the CuO powder are different in particle size range. The solid solution state Al element part in the high-strength plastic copper alloy is oxidized into Al2O3 through CuO, and the Al2O3 exists in a Cu matrix. The preparation method comprises the following steps: (1) mixing Cu-Al pre-alloyed spherical powder with CuO powder, and drying; (2) cold isostatic pressing treatment; (3) vacuumizing, sintering at a high temperature in a protective atmosphere, and cooling; (4) vacuumizing, reducing in a reducing atmosphere, and cooling; and (5) after preheating, the copper alloy reduction blank is placed in a rotary forging die, rotary forging and air cooling are conducted, and the copper alloy is obtained. The high-strength plastic copper alloy is good in conductivity and mechanical property and high in plasticity. The method is simple in process, environmentally friendly, low in cost and suitable for industrial production.

The invention relates to the technical field of metallurgy preparation of heterogeneous materials, in particular to an efficient laser cladding preparation method of nickel-based superalloy on the surface of copper alloy, which comprises the following steps: increasing the absorptivity of the copper alloy to infrared laser through preheating, and carrying out laser cladding on GH3625 alloy on the surface of Cu-Cr-Zr alloy through regulating and controlling the components of a copper alloy / nickel alloy intermediate layer, so as to prepare the nickel-based superalloy on the surface of Cu-Cr-Zr alloy. And formation of a microstructure in the non-equilibrium solidification process is controlled, the process is optimized, and the mechanical property of the material is improved. According to the method, the intermediate layer is utilized to perform non-equilibrium state metallurgy preparation of the GH3625 alloy on the surface of the Cu-Cr-Zr base material, compared with the method without adding the intermediate layer, after the intermediate layer is added, the content of the copper element in a molten pool is increased, liquid-phase separation is promoted, a large-range Ni-Cr core shell is formed to serve as a low-energy nucleation site, crystal grains are refined, and the performance of the Cu-Cr-Zr alloy is improved. Further, a fine grain strengthening effect is achieved; the thickness of the element diffusion layer is also increased by adding the middle layer, the element uniformity is promoted, the dependence on Malangori is reduced, the heat input is reduced, the optimization of process parameters is realized, and the mechanical property of the heterogeneous material is further improved.

The invention discloses a method for preparing fine-grain copper and copper alloy through pulsed magnetic field and rare earth adding composite regulation and control, and belongs to the technical field of copper and copper alloy material preparation. Graphite mold casting is adopted in the method, and the method comprises the specific steps that electrolytic copper with the purity larger than or equal to 99.95 wt% or a copper alloy with specific components is prepared as a matrix raw material; after smelting, adding pure lanthanum blocks and uniformly stirring; after the melt is poured into a preheating mold, a pulsed magnetic field is applied immediately for treatment, and the parameters of the magnetic field are as follows: the pulse voltage is 180-250 V, the frequency is 4.5-6.5 Hz, and the duration time is 15-20 minutes. According to the method, the heterogeneous nucleation effect of rare earth lanthanum is combined with the melt forced convection and dendritic crystal crushing effect caused by the pulsed magnetic field to synergistically refine a solidification structure and promote columnar crystal orientation equiaxed crystal transformation, so that a cast ingot with fine crystal grains is directly obtained in the casting stage, and the possibility is provided for simplifying the subsequent processing technology.

This invention provides a copper alloy and its preparation method. The copper alloy has the following mass percentage composition: Ni: 0.5–2.0 wt%, S: 0.3–0.8 wt%, P: 0.1–0.3 wt%, Sn: 0.1–0.2 wt%, Si: 0.05–0.2 wt%, with the balance being Cu and unavoidable impurities. The microstructure of the copper alloy contains Cu₂S particles. This invention designs the composition and microstructure of the copper alloy, particularly controlling the content range of Ni, P, and Si elements to give the material high strength and high conductivity. Furthermore, the addition of S element forms Cu₂S particles, thereby improving the material's machinability and facilitating its fabrication into connector components.

The invention relates to the field of material science and electronic engineering, and discloses a treatment method of a copper wire doped high-conductivity material, which comprises the following steps: (1) material selection and pretreatment: selecting at least one of silver, nickel and rare earth elements as a doping element, and selecting at least one of a carbon nanotube or graphene as a composite material; pre-treating the doping elements and the composite material to ensure uniform dispersion of the doping elements and the composite material; and (2) alloying process: smelting the pretreated doping elements and a copper-based material to form a copper alloy, and processing the copper alloy into a copper wire through a casting or forging process. By optimizing the material composition of the copper wire and adopting the nano-composite technology, the conductivity, the mechanical strength and the corrosion resistance of the copper wire are remarkably improved; meanwhile, due to the improvement of the surface treatment process, the oxidation resistance of the copper wire is effectively enhanced, the service life of the copper wire is prolonged, and the stability of the copper wire in various severe environments is ensured.

The invention discloses a corrosion-resistant antibacterial copper alloy and a preparation method and application thereof, and the copper alloy comprises the following components in percentage by mass: 0.0035-0.055 wt.% of B; 0.15 to 0.35 wt.% of P; wt.% of Si: 0.005 to 0.05 wt.%; the balance is copper and the content lt; and 0.01 wt.% of inevitable impurity elements. According to the preparation method, the alloy components are combined with an improved preparation process, and the copper alloy with efficient antibacterial performance and excellent corrosion resistance can be obtained at the same time. The 15 min sterilization rate of the copper alloy is larger than or equal to 70%; in a formic acid aqueous solution environment with the concentration of 0.1%, the maximum corrosion depth after cold and heat alternate corrosion for 30 days is smaller than or equal to 44 microns, the corrosion weight loss rate after exposure in a neutral salt mist environment for 480 hours is smaller than or equal to 9.5 * 10 <-5 > g / h, the number of stress corrosion leakage resistance days is larger than or equal to 80 days, and wide application prospects are achieved under the complex working conditions of medical equipment, ocean engineering and the like.

The invention discloses a short-process preparation method of a palladium-silver-copper alloy wire with high palladium content, which comprises the following steps: 1) smelting, blowing out, refining and casting silver, copper and palladium to obtain a palladium-silver-copper master alloy ingot; 2) continuously casting the palladium-silver-copper master alloy ingot into a palladium-silver-copper alloy rod; (3) the palladium-silver-copper alloy rod is continuously rolled, and the total deformation of the palladium-silver-copper alloy rod is controlled to range from 60% to 80% till a palladium-silver-copper alloy thick wire is obtained; and 4) carrying out continuous annealing and drawing on the palladium-silver-copper alloy thick wire to obtain the palladium-silver-copper alloy wire with the diameter of 0.1-0.8 mm. By the adoption of the method, the palladium-silver-copper alloy rod with the good machining performance can be prepared, alloy wires with the tensile strength higher than 1200 MPa and the Vickers hardness larger than 350 HV can be continuously produced in batches, the cleanliness and splatability of the alloy wires both meet the first-level / A-level requirements, and meanwhile the production period is only 30% of that of a traditional technology.

The invention relates to the technical field of rail transit cables, in particular to a preparation method of a bending-resistant sensor cable for a high-speed motor train unit. The preparation method comprises the steps of conductor three-layer twisting and annealing, insulating layer gradient extrusion and plasma treatment, filling, twice wrapping, double-layer shielding, double-layer sheath co-extrusion and irradiation crosslinking post-treatment. The structure of the bending-resistant sensor cable sequentially comprises a high-elasticity fiber rope filler, a copper alloy conductor with a TPEE insulating layer, a thin flame-retardant cloth wrapping layer, an elastic silica gel inner shielding layer, a tinned copper wire and fiber filament outer shielding layer, a thin non-woven fabric wrapping layer and a cross-linked polyurethane double-layer sheath from inside to outside. The bending resistance of the cable exceeds 500,000 times, the cable works stably at the temperature of-50 DEG C to 125 DEG C, the service life is prolonged by 2-3 times, and the cable is suitable for the harsh environment of the high-speed motor train unit.

The invention discloses a preparation method of a lithium-copper composite foil, which comprises the following steps: S1, a lithium-based alloy is selected and rolled to form a lithium alloy foil, and the alloy element in the lithium-based alloy is at least one of magnesium, zinc or aluminum; s2, selecting a piece of copper foil as a supporting framework; and S3, the two pieces of lithium alloy foil and copper foil are stacked together according to the sequence of lithium alloy foil-copper foil-lithium alloy foil, the stacked pieces of lithium alloy foil and copper foil are placed in a roller press to be rolled, metallurgical bonding is formed between the copper foil and the lithium alloy foil, and the lithium-copper composite foil is obtained. The invention adopts release-film-free rolling preparation, aims to solve the problem that lithium metal is easy to stick to a roller due to high viscosity and needs to depend on a high-cost release film in the prior art, simplifies the preparation process of the composite foil, reduces the manufacturing cost, increases the mechanical strength of the lithium-copper alloy foil, reduces the thickness, improves the energy density of the battery, and further improves the product quality and reliability.

The invention belongs to the field of high-thermal-conductivity composite materials, and particularly relates to a 3D printing copper-diamond composite high-thermal-conductivity material and a preparation method thereof.The 3D printing copper-diamond composite high-thermal-conductivity material comprises a copper matrix and diamond particles dispersed in the copper matrix, and the surfaces of the diamond particles are provided with metal coatings; the copper matrix is formed by copper powder with the particle size of 10-100 microns, and the volume fraction of the diamond particles in the composite material is 40%-50%; according to the method, the titanium plating layer is prepared on the surface of the diamond, the stable titanium carbide transition layer is formed through the reaction of titanium and carbon, the interface thermal resistance between the diamond and copper is remarkably reduced, the interface bonding strength is improved, and heat conduction is facilitated. The selected area green laser 3D printing technology is adopted, a green laser device shows remarkable advantages in the field of 3D printing of copper alloy, and the heat conductivity of the prepared composite material can reach and is remarkably higher than that of pure copper by optimizing the diamond volume fraction and 3D printing process parameters.

The invention relates to a low-stress copper-cobalt-nickel-silicon alloy and a preparation method and application thereof. The low-stress copper-cobalt-nickel-silicon alloy comprises 0.5 wt%-1.0 wt% of Ni, 0.005 wt%-0.4 wt% of Co, 0.1 wt%-0.3 wt% of Si, 0.05 wt%-0.4 wt% of Sn, 0.01 wt%-0.02 wt% of P, 0.05 wt%-0.3 wt% of Zn and the balance Cu and inevitable trace impurities. The preparation method of the low-stress copper-cobalt-nickel-silicon alloy comprises the steps of burdening, smelting, casting, hot rolling, rough rolling, primary annealing, intermediate rolling, aging heat treatment, finished product rolling and secondary annealing. The preparation method comprises the following steps: proportioning and smelting according to the mass percent of each element of the copper alloy; the aging heat treatment is stepped aging heat treatment, heating is conducted to 200-350 DEG C, heat preservation is conducted for 1-2 h, then heating is conducted to 400-500 DEG C, and heat preservation is conducted for 10-12 h.

The present invention belongs to the technical field of continuous production of copper alloy strips, and relates to an anti-adhesion treatment method suitable for bell-type annealing of copper alloy strips, which is used for alleviating the edge adhesion phenomenon of copper alloy strips after bell-type annealing, reducing the problems of surface damage and deformation caused by edge adhesion, and reducing the rejection rate. In the present invention, by means of improving the sheet shape consistency of a material coil before annealing and using a low-viscosity oil film as an interlayer spacer of the material coil, it is ensured that material is uniformly stressed during a coiling process; then, the tension and self-weight differences of inner and outer rings of the coiled material are used during recoiling, and by means of using stepped coiling tension, optimizing the coiling manner, using a dedicated tower-shaped projecting-surface material disc in conjunction, with the position of a sleeve at the center of the material coil serving as a main bearing portion, and controlling the rate of a material temperature change stage in an annealing stage to reduce thermal stress, the stress concentration phenomenon at the edge of a strip coil can be effectively alleviated, thereby alleviating the problem of edge adhesion.

The invention relates to the technical field of solar energy, and discloses a metal electrode for a solar cell, a preparation method of the metal electrode and the solar cell. The metal electrode comprises a metal seed layer (which is at least one of a silver seed layer, a nickel seed layer, a zirconium seed layer, a titanium seed layer, a chromium seed layer, a nickel-silicon alloy seed layer and a copper alloy seed layer) arranged in a grid line area on the surface of a silicon substrate, and a base metal grid line (which is at least one of a copper grid line and an aluminum grid line) arranged on the surface of the metal seed layer, and a copper phosphate protection layer (which is at least one of a copper phosphate layer and an organic copper phosphate compound layer) arranged on the surface of the base metal grid line. Through cooperation of the metal seed layer, the base metal grid lines (such as copper grid lines) and the copper phosphate protection layer, the metal electrode can reduce contact resistance, ensure interface bonding force, save cost and improve corrosion resistance of the base metal grid lines, so that stability and reliability of the metal electrode in outdoor long-term use are improved, and attenuation of battery efficiency is slowed down.