3670 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 discloses a copper alloy pipe and a preparation method and application thereof, and the copper alloy pipe comprises the following components in percentage by mass: 0.01%-0.80% of Sn, 0.005%-0.05% of P, 0.01%-0.10% of Zr, 0.001%-0.01% of B, 0.001%-0.01% of Mn and the balance of Cu and inevitable impurities. Wherein the copper alloy pipe contains MnZr and BMn compound particles, the number of the MnZr compound particles on the cross section of the copper alloy pipe is 0.005-0.15 / mu m < 2 >, and the number of the BMn compound particles on the cross section of the copper alloy pipe is 0.005-0.2 / mu m < 2 >. By adding Zr, B and Mn and controlling the content of Zr, B and Mn, the preparation process and the like, the number and uniformity of MnZr and MnB compounds are regulated and controlled, and the tensile strength, ductility, corrosion resistance, bending, flaring, welding, pressure resistance and other machining performance of the copper alloy pipe are improved; and the prepared copper alloy pipe fully meets the application requirements of heat conduction pipes of air conditioner heat exchangers, air conditioner indoor and outdoor unit connecting piping and the like.

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 relates to the related technical field of fabricated building outer walls, and discloses a severe cold area fabricated building outer wall based on a thermoelectric power generation technology, which comprises a fabricated wall body module, a thermoelectric power generation module, a heat collection structure module, a circuit connection module, an energy management module and a data monitoring module, the fabricated wall body module is a solid prefabricated concrete shear wall composed of an inner leaf wall plate, a heat preservation layer and an outer leaf wall plate, the heat collection structure module is fixedly installed on the outer wall of the fabricated wall body module, and the heat collection structure module comprises a heat absorption plate, a glass cover plate and a shell; according to the core component, the nickel-chromium alloy and the constantan alloy which are high in stability are directly welded for power generation, other technologies do not need to be combined, the core component can be directly applied to the building field, and under the condition that the power generation efficiency is guaranteed, the construction requirement of the building field is met as much as possible; and a brand new thought is developed for the energy-saving design of the fabricated building wall.

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 discloses a copper alloy material with ultrahigh strength and high conductivity and a preparation method thereof. The copper alloy material comprises, by mass, 5%-13% of Ni, 6%-14% of Sn, 40%-70% of Sn (Ni + Sn), 0.01%-0.5% of M and the balance Cu, and M is selected from at least one of In, Al, Cr, V, Mn and Fe. The preparation process comprises the following steps: carrying out multi-stage homogenization treatment on a cast ingot of a columnar crystal structure containing the components, carrying out cyclic'processing-current treatment 'on the homogenized cast ingot to obtain an ultra-fine crystal structure, and then carrying out processing-aging treatment to obtain the ultra-fine crystal structure. The copper alloy material provided by the invention not only has ultrahigh hardness and tensile strength, but also has good conductivity.

The invention relates to the technical field of powder metallurgy, in particular to a tungsten-copper alloy preparation method and a tungsten-copper alloy. The preparation method of the tungsten-copper alloy comprises the following steps: mixing double-scale compound tungsten powder containing nanocrystals and ultra-fine grains or double-scale compound tungsten-tungsten oxide powder containing nanocrystals and ultra-fine grains with copper oxide powder to obtain precursor slurry; drying the precursor slurry to obtain precursor composite powder; the precursor composite powder is subjected to segmented reduction, tungsten-copper composite powder is obtained, and tungsten crystal grains in the tungsten-copper composite powder are distributed in a double-scale mode of nanocrystals and ultra-fine crystals; and the tungsten-copper composite powder is prepared into a blank and sintered, and the tungsten-copper alloy is obtained. The heat conductivity and density of the tungsten-copper alloy can be 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 belongs to the field of electrical electronics and advanced non-ferrous metal additive manufacturing, and particularly relates to a preparation method of a laser additive manufacturing copper alloy-tungsten copper composite electrical contact, which comprises the following steps of: preparing a nickel or nickel alloy coating on a copper alloy base material by adopting coaxial powder feeding laser cladding to serve as a middle layer, and then preparing a tungsten copper coating by laser cladding to obtain the copper alloy-tungsten copper composite electrical contact. The composite electrical contact is composed of a pure copper or copper alloy base material layer, a pure nickel or nickel alloy coating and a tungsten copper coating in sequence. The electrical contact obtained by the invention has relatively high electrical conductivity and thermal conductivity, and also has good arc ablation resistance; the copper alloy-tungsten copper electrical contact is prepared by adopting the laser cladding technology, so that the production cost can be effectively reduced, the production efficiency is improved, meanwhile, later maintenance and repair are facilitated, and the method is green and environment-friendly.

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 a manufacturing method of a small-caliber nickel-copper alloy seamless heat exchange tube. The manufacturing method comprises the steps that S1, a UNS N04400 round steel material is subjected to peeling, PT inspection, shearing, centering, grinding, heating, perforating, water cooling and inspection; s2, a hot-punched blank is only cleaned, and inspection is conducted after point grinding is conducted after internal and external polishing; s3, the obtained pipe blank is subjected to first-pass intermediate product cold rolling, deoiling, straightening, pipe cutting, grinding, inspecting and cleaning; s4, second-pass intermediate product cold rolling, deoiling, heat treatment, straightening, pipe cutting, grinding, inspection and cleaning are conducted; S5, finished product cold rolling is conducted; s6, deoiling a finished product; s7, heat treatment of a finished product; s8, straightening a finished product; s9, performing ultrasonic vortex treatment, water pressure treatment and pipe cutting on a finished product; and S10, finished product surface inspection, size inspection, cleaning, mark spraying and finishing procedures are carried out. The method has the advantages of high one-time inspection qualification rate, yield and dimensional precision of products, good inner and outer surface quality, stable structure performance and high practicability.

The invention relates to the technical field of copper product preparation, in particular to a continuous extrusion preparation method for a copper and copper alloy micro-channel flat tube. The method comprises the following steps: when extrusion welding preparation is carried out on a micro-channel flat pipe through extrusion welding equipment, collecting real-time welding parameters of a welding interface at a plurality of preset time nodes, and carrying out redundancy removal treatment on the collected real-time welding parameters to obtain real-time welding parameters after redundancy removal; according to the real-time welding parameters after redundancy removal, the state condition of the welding interface of the micro-channel flat pipe after a future preset time period is obtained in combination with a performance prediction model; and if the state condition of the welding interface of the micro-channel flat pipe after the future preset time period is a sudden change state condition, the welding parameters are regulated and controlled. The intelligent level of the micro-channel flat tube extrusion welding preparation process can be effectively improved, the product quality problem caused by abrupt change of welding interface performance is reduced, and the production efficiency and the product quality stability are improved.

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.

A method for improving the density of a copper alloy part comprises the following steps that forming is conducted, specifically, dry copper alloy powder is selected and laid layer by layer through a binder spraying 3D printing technology, and a binder is selectively sprayed through a slice pattern of the part till a 3D printing model is completed; curing is conducted, specifically, the printed 3D printing model is subjected to thermocuring, and after thermocuring, powder cleaning is conducted to obtain a copper alloy green body; degreasing: degreasing the copper alloy green body in a vacuum degreasing furnace to obtain a degreased green body; and sintering is conducted, specifically, the degreased blank is subjected to sectional type sintering and then cooled to the room temperature along with a furnace, and the copper alloy part is obtained. After the copper alloy powder is subjected to jet printing forming through a binding agent, under the vacuum thermocuring process, a printed model has certain strength, and oxidation cannot be generated; the binder is effectively removed through vacuum degreasing, the quality and performance of the subsequent sintering process are guaranteed, and the compactness of the part is remarkably improved through segmented sintering and furnace cooling.

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 manufacturing process of a circuit board structure of aviation equipment, which comprises the following steps of: providing a carbon fiber reinforced ceramic substrate, after desizing process treatment, coating high-temperature ceramic slurry on the carbon fiber reinforced ceramic substrate, forming a high-temperature-resistant base material layer through vacuum drying, coating an electromagnetic shielding material on the surface of the base material layer, and forming the circuit board structure of the aviation equipment. Designing a circuit pattern, and transferring the circuit pattern to the electromagnetic shielding layer through a laser cutting or etching process to form a circuit layout; wiring the copper alloy film according to the circuit pattern, and combining the copper alloy film with the polymer composite material middle layer through a lamination process to form an electrical connection layer; coating the surface of the circuit board with a resin material, performing curing treatment, mounting a metal connecting piece in the edge area of the circuit board, performing connection in a crimping manner, then performing a 3D printing process, and printing connecting points on the surface of the circuit board; the circuit board provided by the invention has the advantages of high temperature resistance, electromagnetic interference resistance, support and excellent protection performance.

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 provides a high-strength and high-conductivity copper alloy with a fine grain structure and a preparation method of the high-strength and high-conductivity copper alloy, and belongs to the technical field of copper alloy preparation. The copper alloy comprises the following elements in percentage by mass: 2.0-12.0 wt.% of Ni, 0.4-3.0 wt.% of Si, less than or equal to 1.0 wt.% of Zn, less than or equal to 5.0 wt.% of Ti, less than or equal to 1.0 wt.% of B and the balance of Cu and inevitable impurities. According to the method, the heat treatment process is adjusted, generation of Ni16Ti6Si7 and TiB2 phases is promoted through introduction of Ti and B elements, micron-sized particles can serve as nucleation sites and pinning grain boundaries in the heat deformation process, and grain refinement is promoted. The high-strength and high-conductivity copper alloy with a fine grain structure is obtained by changing the content of Ti and B elements in the copper alloy and regulating and controlling the proportion of Ni16Ti6Si7, a TiB2 micron phase and a Ni2Si nano phase.

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 belongs to the technical field of annealing equipment, and particularly relates to online stress relief annealing equipment and method for copper alloy stamping parts. The online stress relief annealing equipment comprises an annealing furnace, a hot air circulating fan fixed to the surface of the annealing furnace and a conveyor placed at the feeding end of the annealing furnace; the device is provided with the feeding assembly, copper alloy stamping parts can be rapidly and efficiently transferred and clamped, feeding operation can be completed under the condition that workers do not need to make direct contact with high-temperature parts, direct contact between the workers and the high-temperature copper alloy stamping parts is completely avoided, the skin scalding accident is fundamentally eradicated, and the working efficiency is improved. According to the feeding device, feeding operation can be conducted continuously, so that the production efficiency of the whole stress relief annealing process is improved, the continuity of the production process is ensured, feeding errors caused by fatigue, inattention and the like of workers are eliminated, seamless connection with stress relief annealing equipment can be achieved, and the whole machining process is smoother.

A copper-ceramic bonded body (10, 110) in which a copper member (12, 13, 112, 113) comprising copper or a copper alloy is bonded to a ceramic member (11, 111), in which an active metal compound layer (31) or a magnesium oxide layer (131) is formed in a region on the copper member side of the ceramic member (11, 111). The active metal compound layer (31) contains a compound of one or more active metals selected from the group consisting of Ti, Zr, Nb and Hf, and transition metal layers (34, 134) containing one or more transition metals selected from the group consisting of V, Cr, Mn, Fe, Co, Ni, Mo, Ta and W are formed at the interface of the active metal compound layer (31) or the magnesium oxide layer (131) on the copper member side.

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 relates to the technical field of alloy processing, in particular to a long-service-life elastic titanium-copper alloy for a VCM elastic piece and a preparation method thereof.The preparation method comprises the following steps that firstly, raw materials including 55%-65% of titanium, 30%-25% of copper, 10%-8% of aluminum, 3%-1% of zinc and 2%-1% of magnesium are weighed according to the mass percent; 2, the raw materials are put into a vacuum furnace to be melted, and a liquid melt is obtained; thirdly, the melt is poured into a casting mold for casting, and a blank is obtained; according to the method, the change of the state of the blank can be responded in real time by calculating the influence of the rolling times and the thickness change of the blank on the rolling control parameters, so that the rolling process can be flexibly adjusted according to the actual situation, the adaptability during machining is improved, and the rolling speed is improved when the rolling times are gradually reduced along with the reduction of the rolling times of the blank. The rolling temperature, ratio, speed and pressure are reduced, excessive deformation and damage of blanks can be effectively prevented, and the quality of final products, namely the elastic life of the alloy, is improved.

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.