196 results about "Copper matrix" patented technology

The invention discloses a regulation and control method and a preparation method of in-situ ceramic particles of a copper-based composite material. The method comprises the following steps: weighing according to a reaction equation and a reaction molar ratio; the molar ratio coefficient is changed, trace alloy is added, and the size and morphology of in-situ particles are regulated and controlled; the copper-based pre-dispersed in-situ ceramic intermediate alloy reinforcer is prepared through powder mixing, cold pressing and sintering; crushing the reinforcer, remelting, stirring and casting; and after the cast alloy is subjected to heat treatment, the high-performance in-situ particle reinforced copper-based composite material is prepared. According to the obtained in-situ ceramic intermediate alloy reinforcer, pre-dispersion of ceramic particles in a copper matrix can be achieved, and good combination of the particles and the matrix is achieved by adding the copper-based pre-dispersion in-situ ceramic intermediate alloy reinforcer into a molten matrix alloy; interface pores caused by sharp corners, surface pollution and the like of the heterogeneous particles in an external addition method are avoided, and the strengthening effect of the heterogeneous particles is weakened.

The invention relates to a method for constructing a composite super-hydrophobic coating through double bonding. The preparation method comprises the following steps: taking a clean copper sheet which is not pretreated as a substrate, dipping the copper sheet in a suspension consisting of nanoparticles and sulfydryl-containing siloxane ethanol, taking out, washing, drying, dipping in a perfluoromercaptan ethanol solution, taking out, washing, and drying to obtain the copper-based super-hydrophobic surface coating. The coating prepared by the method has excellent super-hydrophobicity, icing resistance and stability. Different from an existing conventional preparation method, the method has the advantages that pretreatment operation such as abrasive paper polishing, strong acid etching or anodic oxidation does not need to be carried out on a copper sheet, and micro-nano roughening and low-surface-energy self-assembly can be completed on the copper surface only through two-step normal-temperature dipping. The method is simple in preparation process, mild in condition, free of expensive equipment, thin in coating thickness and small in influence on electric conduction and heat conduction of the copper substrate, intrinsic performance of copper can be reserved, the electric conduction / heat conduction characteristic of the copper substrate is considered, and the method has wide application value and prospects.

The invention discloses a high-entropy alloy wear-resistant coating with a silicon-containing transition layer for improving the wettability of a copper surface and a laser cladding method, and relates to the technical field of alloy coatings. The method comprises the following steps: providing silicon-containing transition layer alloy powder and CoCrFeNiTi series high-entropy alloy powder; providing a copper base material, and cleaning the surface to be cladded of the copper base material; cladding silicon-containing transition layer alloy powder on the surface of the copper base material by adopting a laser cladding process under a protective atmosphere to form a silicon-containing transition layer; and under the protective atmosphere, CoCrFeNiTi series high-entropy alloy powder is cladded on the surface of the silicon-containing transition layer through a laser cladding process, and the high-entropy alloy wear-resistant coating is formed. According to the high-entropy alloy coating disclosed by the invention, the Si element in the transition layer can be subjected to interface reaction with a copper substrate to form a Cu-Si solid solution phase with low interface energy, so that the interface tension between copper and a subsequent cladding coating is remarkably reduced, and the wettability between the copper substrate and a coating material is fundamentally improved; the high-entropy alloy coating is successfully cladded on the copper surface with poor wettability.

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 belongs to the technical field of additive manufacturing, and particularly relates to a diamond / copper radiator manufacturing method based on 3D printing, and the diamond / copper radiator manufacturing method comprises the steps that diamond / copper composite powder is prepared, and the composite powder comprises diamond particles with nano alloying elements attached to the surfaces and spherical copper powder; and under shielding gas, green laser with the wavelength of 532 nm is adopted for conducting selective laser melting scanning on the composite powder, meanwhile, high-frequency ultrasonic vibration is applied to a molten pool in a laser acting area, and a diamond / copper composite material radiator green body is formed through layer-by-layer powder laying, scanning melting, ultrasonic assistance and layer-by-layer accumulation. Copper matrix crystal grains are refined through ultrasonic energy, residual stress in the printing process is reduced, generation of microcracks is effectively restrained, the mechanical property and reliability of a workpiece are improved, the high absorptivity of green laser to copper and the technical advantages of 3D printing are combined, and high-quality 3D printing is achieved. And the radiator with fine structures such as complex three-dimensional micro-channels and ultrathin fins can be integrally manufactured.

The invention discloses a three-dimensional graphene copper composite material based on in-situ interface chemical bonding and a preparation method and application of the three-dimensional graphene copper composite material, relates to the technical field of metal-based composite materials, and solves the problems of graphene dispersion and interface bonding. The preparation method of the three-dimensional graphene copper composite material comprises the following steps: dissolving soluble copper salt and an organic ligand in water to form a complex solution, adding copper powder into the complex solution, uniformly mixing, and drying to obtain precursor coated copper powder; and carrying out spark plasma sintering or vacuum hot pressed sintering on the precursor coated copper powder to obtain the copper powder. A three-dimensional interpenetrating continuous network formed by graphene is arranged in the prepared three-dimensional graphene copper composite material, the interface of the graphene and a copper matrix is a chemical bonding interface, the comprehensive performance is excellent, and the composite material has high conductivity (gt; 103% IACS) and a high strength (gt; the comprehensive performance of the composite material is far better than that of a composite material prepared by a traditional method, and the composite material is suitable for high-end electric conduction, heat conduction and structural function integrated components.

The invention discloses a wear-resistant hybrid core-shell electric contact material and a preparation method, and relates to the technical field of electric contact materials, the electric contact material is prepared by taking copper as a matrix, adding SiC (at) Cu composite powder, CNT (at) Cu composite powder, Ti3SiC2 powder and a rare earth oxide dopant, and preparing the composite powder, mixing the powder, forming, sintering and the like. The composite powder with the core-shell structure is prepared through chemical plating, magnetron sputtering, chemical vapor deposition and other technologies, the interface wettability of a reinforcing phase and a copper matrix is effectively improved, through the multi-element hybrid reinforcing design, the hardness, abrasion resistance and heat conduction performance of the material are synergistically improved, the thermal expansion coefficient and the friction factor are reduced, and the service life of the material is prolonged. The prepared electric contact material has excellent comprehensive performance, can be widely applied to the fields of electric locomotive pantograph slide plates, electronic packaging and the like, and is stable and controllable in preparation process and suitable for industrial production.

The application provides a high-entropy particle reinforced heat-resistant copper alloy, a preparation method and application thereof. The high-entropy particle reinforced heat-resistant copper alloy comprises a copper matrix phase and FeCoNiCrSi high-entropy particle phases dispersed in the copper matrix phase; and the chemical formula of the high-entropy particle reinforced heat-resistant copper alloy is (Fe a Co b Ni c Cr d Si e ) x Cu 100‑x , wherein a is 15-30, b is 25-45, c is 1-5, d is 10-20, e is 10-40, and x is 4-6. In the copper alloy, the FeCoNiCrSi high-entropy particle phase serves as a reinforcing core, effectively prevents dislocation movement through dislocation pinning effect, significantly improves the mechanical strength of the obtained copper alloy, minimizes the stress generated by lattice mismatch to ensure the toughness of the obtained alloy, prevents high-temperature creep of the copper alloy, and significantly improves the heat resistance of the copper alloy.

This invention provides a battery. The battery includes a negative electrode sheet, which includes a negative electrode current collector and a negative electrode active material layer disposed on at least one surface of the negative electrode current collector. The negative electrode active material layer includes a first negative electrode active material layer and a second negative electrode active material layer, with the first negative electrode active material layer located between the negative electrode current collector and the second negative electrode active material layer. The first negative electrode active material layer includes a carbon-based active material, and the second negative electrode active material layer includes a silicon-based active material. The particle size Dv90 of the silicon-based active material is smaller than the thickness Bμm of the first negative electrode active material layer. The negative electrode current collector includes a copper substrate and a protective layer disposed on at least one surface of the copper substrate. The thickness Anm of the protective layer satisfies: 20≤A≤100. The negative electrode sheet satisfies: 0.5≤A / B≤6. The battery provided by this invention has a low interface resistance of the negative electrode sheet, a low degree of copper deposition, good structural stability of the negative electrode current collector, and high cycle performance.

The invention belongs to the technical field of copper composite material preparation, and particularly relates to a preparation method of a single-walled carbon nanotube-copper composite material. The preparation method comprises the following steps: preparing a single-walled carbon nanotube by adopting a floating catalysis method, sequentially carrying out acid pickling and high-temperature repair purification, then carrying out mixed acid gradient oxidation on the single-walled carbon nanotube, modifying cobalt nanoparticles on the surface of the single-walled carbon nanotube through chemical deposition, and then compounding an amorphous titanium oxide coating on the modified single-walled carbon nanotube by utilizing a sol-gel method, so as to obtain the cobalt-doped carbon nanotube composite material. Adding the composite powder into molten copper, uniformly mixing under the auxiliary stirring of ultrasound and a magnetic field in a specific direction, and finally, quickly solidifying and thermally drawing into a copper rod through a hot continuous casting method under the assistance of a continuous magnetic field, so as to obtain the single-walled carbon nanotube-copper composite material. According to the method, the dispersity and the interface bonding strength of the single-walled carbon nanotubes in the copper matrix are improved, and the single-walled carbon nanotubes are directionally arranged in the copper matrix; the method is simple in process, and the prepared composite material has excellent electric conduction, heat conduction and mechanical properties.

This invention provides a method for preparing a foamed copper-based composite organic compound layer catalytic material, comprising the following steps: forming 8-hydroxyquinoline molybdenum (Mo(C)) on the surface of a foamed copper matrix. 9 H 6 NO) 4 Organic compound layer; 8-hydroxyquinoline molybdenum (Mo(C)) 9 H 6 NO) 4 The organic compound layer is converted into phthalimide 8-hydroxyquinoline molybdenum (C). 8 H 4 NO 2 ) 2 (C 9 H 6 NO) 2 ; Phthalimide 8-hydroxyquinoline molybdenum Mo(C) 8 H 4 NO 2 ) 2 (C 9 H 6 NO) 2 Conversion to copper phthalimide / 8-hydroxyquinoline molybdenum Cu(C) 8 H 4 NO 2 ) 2 / Mo(C 9 H 6 NO) 2 The foamed copper-based composite organic compound layer catalytic material is finally obtained. The catalytic material prepared by the method of this invention can effectively improve the Faradaic efficiency, ammonia selectivity, production rate, and nitrate removal rate of the electrochemical reduction of nitrate to ammonia technology.

The application discloses an oriented structure graphene / copper composite filler metal, graphene is coated on the surface of flaky copper powder, and then is compacted, so that the graphene and copper are closely arranged in layers and intervals. The application further discloses a preparation method of the oriented structure graphene / copper composite filler metal, comprising the following steps: taking the flaky copper powder coated with graphene to perform hot-pressing sintering or discharge plasma sintering, so as to obtain the oriented structure graphene / copper composite filler metal. The application further discloses a sandwich composite brazing structure. The application further discloses application of the oriented structure graphene / copper composite filler metal and the sandwich composite brazing structure in ceramic and metal welding. The application further discloses a welding method. In the oriented structure graphene / copper composite filler metal, the graphene and copper are closely arranged in layers and intervals, and the arrangement orientation of the graphene is kept consistent; when brazing, the graphene can effectively hinder active elements such as Ti from corroding the copper matrix, reduce the residual stress of the welded joint, and improve the welding strength.

The invention discloses a processing method of an anti-fracture piston skirt copper ring, which aims at solving the problems that MB7 alloy used by a marine diesel engine piston skirt copper ring is easy to generate lead emission, segregation and assembly fracture, adopts a composite casting mold of a copper ring molten steel jacket and a resin sand mold core, and is matched with bottom pouring type pouring to form a sequential solidification temperature gradient; a circulating water continuous chilling process is combined, so that the defect of non-uniform solidification of a low-melting-point phase is overcome, and meanwhile, copper matrix grains are refined to improve the ductility; step 1, casting mold preparation; 2, alloy smelting; thirdly, bottom pouring type sequential solidification pouring is conducted; 4, continuous chilling with circulating water; and 5, post-processing and assembling. According to the machining method for the anti-fracture piston skirt copper ring, the machined copper ring can bear 120 MPa circumferential pressure without cracks when being embedded into a piston skirt, the product percent of pass is increased, and the machining method is already applied to production of marine diesel engines in batches and is high in market share.

The invention discloses a preparation method of a hemispherical micro-pit array on a copper surface. The preparation method comprises the following steps: processing a round pit array on the surface of a copper substrate by adopting laser; and the obtained copper substrate is subjected to chemical etching, and the hemispherical micro-pit array is obtained. According to the preparation method of the copper surface hemispherical micro-pit array, laser-assisted chemical etching is adopted, fixed-point etching is achieved, no template is needed, the hemispherical micro-pit array with the large depth-diameter ratio can be prepared, operation is easy, cost is low, efficiency is high, forming quality is high, defects are small, and the preparation method is suitable for batch production.

The application belongs to the field of metallurgy, and provides a copper alloy and a preparation method thereof.The copper alloy comprises a copper matrix and high-entropy alloy nano precipitated phases distributed in the copper matrix, and the high-entropy alloy nano precipitated phases comprise iron elements, cobalt elements, nickel elements and chromium elements.The application introduces high-entropy alloys as nano precipitated phases into the copper matrix, and the obtained copper alloy simultaneously has high electrical conductivity and thermal conductivity, and strength and ductility.

The invention relates to composite copper alloy powder and application thereof, and belongs to the technical field of laser additive manufacturing, when the copper alloy powder comprises Cu, Cr, Nb, Ti and Sc, Cr and Nb serve as main strengthening elements, the alloy strength and high-temperature stability can be remarkably improved, the added Ti has the fine grain strengthening effect, and the toughness of the alloy can be improved when grains are refined during atomization powder preparation; sc serves as a trace rare earth element and can purify a matrix, so that the content of inevitable impurities in the alloy powder is reduced, and the oxidation resistance and the machining performance of the copper alloy powder are improved; when the content of Cr is 2.5%-3.5%, the content of Nb is 2.0%-3.0%, the content of Ti is 0.2%-0.8% and the content of Sc is 0.03%-0.30%, the strengthening effect of the copper alloy powder can be guaranteed, meanwhile, damage to the characteristics of a copper matrix due to excessive addition can be prevented, and the problems that in the prior art, cracks, holes and incomplete fusion are prone to occurring in an alloy material in the laser additive manufacturing process are solved.

The invention provides a nanopore dispersion strengthened copper material and a preparation method thereof. The material is obtained through a two-step method of firstly oxidizing and then reducing: firstly, adding an oxygen element into copper, namely preparing a precursor with a Cu-Cu2O two-phase structure from copper and copper oxide, and adopting a powder coating-laser powder bed melting or electric arc melting-solidification process; and then performing thermal reduction in a reducing atmosphere, so that cuprous oxide in the precursor is reduced and converted into closed nanopores in situ. The obtained material is composed of a copper matrix with micron-sized crystal grains and nano-sized holes which are uniformly and dispersedly distributed. According to the method, the atomic ratio of Cu to O, the solidification cooling speed and the reduction temperature / time are adjusted, and the volume ratio of the Cu2O phase in the precursor is adjusted through high-temperature annealing aftertreatment, so that the porosity and the pore diameter are adjusted and controlled. According to the method, heterogeneous elements are not introduced, the process is universal, the cost is friendly, and the obtained material has high strength, high conductivity and excellent high-temperature structural stability.

The invention relates to the technical field of metal alloys, and particularly discloses a high-temperature-resistant and corrosion-resistant aluminum alloy and a preparation method thereof.The aluminum alloy is improved through a low-copper matrix, nanometer dispersed phase strengthening and surface treatment, the limitation of traditional alloying is broken through, and the high-temperature-resistant and corrosion-resistant aluminum alloy is obtained. The high-temperature resistance and the corrosion resistance of the aluminum alloy material serving as the foil of the heat exchanger are improved, and the contradiction between the high-temperature resistance and the corrosion resistance of the thin-wall aluminum foil of the heat exchanger is solved.

The invention discloses a preparation method of a high-stability bronze-process niobium-tin wire, and relates to the technical field of superconducting wire preparation, and the preparation method comprises the following steps: assembling a composite ingot according to a composite structure which sequentially comprises an outer copper matrix, an outer barrier layer, a bronze-based CuNb layer, an inner barrier layer and an inner copper matrix from outside to inside; the composite ingot is sequentially subjected to heat preservation extrusion and multi-pass cold drawing, and a composite wire is obtained; carrying out heat treatment on the composite wire to obtain a Ni3Sn wire; the outer blocking layer and the inner blocking layer are made of Nb or Ta or Nb alloy or Ta alloy or Ta / Nb alternating composite layers. The Ni3Sn wire is prepared by designing a composite structure with double barrier layers and combining heat preservation extrusion, multi-pass cold drawing and heat treatment, the critical current density and the residual resistance ratio of the wire are increased, and then the stability of the wire is improved.

The invention discloses a temperature control bus of a nano composite material and a preparation process thereof, and the temperature control bus of the nano composite material comprises the following components in parts by mass: 60-80 parts of a copper matrix; 5 to 15 parts of graphene nanosheets; 3 to 10 parts of aluminum oxide nano particles; 2 to 8 parts of zinc borate nanoparticles; 1-5 parts of a silane coupling agent; 5 to 15 parts of a nano composite phase change material; 3 to 10 parts of a nano composite heat-sensitive material; 2-8 parts of a nano composite heat-conducting filler; according to the nano composite material temperature control bus, the nano composite phase change material, the nano composite heat-sensitive material and the nano composite heat-conducting filler are added, so that the temperature of the bus can be automatically adjusted in different temperature environments, thermal expansion and resistivity change are effectively reduced, and the current transmission efficiency is improved; the heat stability and the heat-conducting property of the bus are improved, and the mechanical property and the safety are enhanced, so that the bus can operate efficiently and stably under various complex working conditions.

The invention relates to the technical field of copper alloys, in particular to a high-strength and high-conductivity C19400 copper-based composite material and a preparation method thereof. The method mainly comprises the steps that copper powder, iron powder, copper-phosphorus alloy, modified nano TiC and copper-cerium alloy powder are mixed and then subjected to high-energy ball milling, and the high-strength and high-conductivity C19400 copper-based composite material is obtained through vacuum drying, compression molding, pressure sintering and double-stage aging treatment, and the modified nano TiC is subjected to rare earth Ce precursor coating and weak oxidation heat treatment, so that the high-strength and high-conductivity C19400 copper-based composite material is obtained. And a cerium dioxide film layer is formed on the surface in situ, so that the dispersibility of nano TiC and the interface bonding between the nano TiC and a copper matrix can be improved. Through matching of the raw materials and the preparation steps, the effects of precipitation strengthening, dispersion strengthening and interface strengthening can be effectively coordinated, and the strength, the conductivity and the structure stability of the material are improved.

This invention provides a collector for recovering platinum group metals (PGMs) from spent catalysts, its preparation method, and its application, belonging to the technical field of precious metal recovery. The collector comprises a copper matrix, a flux, a framework support, and a lattice activator: the copper matrix, flux, and lattice activator are loaded on the surface of the framework support; the copper matrix is ​​elemental copper or a copper-based compound; the flux is boric acid or a borate; the framework support is a porous inorganic material; and the lattice activator is tin, a tin alloy, or a metal sulfide. The collector serves as a collector for the pyrometallurgical recovery of PGMs from spent catalysts. This invention constructs a multi-component synergistic collector composed of a copper matrix, flux, framework support, and lattice activator, which significantly improves the recovery rate of PGMs, especially rhodium, from spent automotive exhaust purification catalysts in pyrometallurgical treatment, and reduces the smelting temperature required for pyrometallurgical treatment, thus significantly reducing energy consumption.

The invention belongs to the technical field of superconducting material processing, and discloses a magic angle graphene modified niobium-tin superconducting wire and a preparation method thereof. The magic angle graphene is modified on the surface of the core wire of the Nb3Sn superconducting wire prepared by the bronze method, the material can eliminate work hardening of a bronze matrix, and one-time and uninterrupted continuous stretching forming from a composite billet to the final wire is realized. In addition, the Nb3Sn superconducting wire has excellent mechanical performance, superconducting performance and strain tolerance, the magic angle graphene layer can effectively inhibit crack initiation and expansion of the Nb3Sn reaction layer under strain, and the mechanical performance of the wire is improved; the material not only can be used as an additional magnetic flux pinning center, but also can induce formation of finer Nb3Sn grains with tough grain boundaries, so that the critical current density of the wire is remarkably improved; the critical current irreversible strain limit of the Ni3Sn superconducting wire modified by the magic angle graphene is 0.8% and is obviously higher than that of a Ni3Sn superconducting wire prepared by a traditional bronze method.

The invention discloses a material for an electromagnetic rail gun guide rail and a preparation method and application thereof, and belongs to the technical field of copper-based composite materials. The invention relates to a material for a guide rail of an electromagnetic rail gun. The material comprises a 5-20nm nano precipitated phase dispersed and distributed in a copper matrix; the MXene lamellas are continuously distributed on the grain boundary, and the nanometer MAX phase is distributed in the grain; and the nano precipitated phase, the MXene sheet layer and the nano MAX phase form a continuous reinforced network. The Cu-Ti-Be-Co alloy serves as a matrix, and unification of high strength and high conductivity is achieved through the synergistic effect of nanometer precipitated phase strengthening and MAX and MXene strengthening. The yield strength of the composite material reaches more than 700MPa and the conductivity is greater than or equal to 80% IACS (International Annealed Copper Standard) by regulating and controlling the interface combination of MAX and MXene with a matrix and the size and distribution of a nano precipitated phase, and the composite material is suitable for the fields of high-load electromagnetic guide rails, electromagnetic rail guns and the like.

The invention relates to the technical field of metal material processing, and discloses a preparation method of a copper-silver alloy for a high-strength and high-conductivity new energy wire harness, which comprises the following steps: inhibiting segregation caused by copper-silver density difference and refining grains by using a rotating traveling wave magnetic field and a high-energy ultrasonic beam through magneto-acoustic double-field coupling rheological continuous casting. And then under a cryogenic environment, special modified polysiloxane-graphene hybrid conductive gel is matched for large-strain drawing, the gel keeps semi-solid lubrication at a low temperature, and a conductive channel is established. And finally, establishing an axial temperature gradient by utilizing the temperature difference between the cryogenic state of the wire rod and the contact electrode area, and applying a unipolar electric pulse to trigger the Thomson effect. According to the process, a Thomson heat flow item is used for correcting a Joule thermal field, and electron wind power is used for driving silver atoms to be directionally separated out along high-density dislocation while overheating softening of a copper matrix is restrained. The method effectively solves the problem that the strength conductivity is inverted due to solidification segregation and traditional heat treatment, and the comprehensive performance of the copper-silver alloy is synchronously improved.

The invention relates to the field of copper foil composite materials, in particular to a composite copper foil for deep space exploration of a battery current collector and a preparation method and application of the composite copper foil. The nano-composite reinforced core layer is a composite copper matrix obtained by pulse electrodeposition; the high-conductivity surface layer is a copper layer which is epitaxially grown on the composite copper substrate by direct current deposition, and the copper layer is provided with a gradient structure for gradually increasing the conductivity of the composite copper substrate from inside to outside; the self-adaptive passivation layer is an amorphous composite ceramic protection layer used for preventing the high-conductivity surface layer from being oxidized. The nano-sized graphene with defects is introduced in the preparation process, and parameters of each step are accurately controlled, so that the comprehensive performance of the copper foil is improved, and the requirement of high-energy density design of the lithium ion battery is met.

The invention discloses a composite current collector, a preparation method of the composite current collector, a pole piece and a battery. The composite current collector comprises a macromolecular base membrane layer and a central layer located on the composite current collector, the copper metal layers are positioned on two side surfaces of the macromolecular base film layer of the composite current collector; the metal diffusion barrier layers are positioned on two side surfaces of the copper metal layer of the composite current collector; the oxygen-containing sputtering layers are positioned on two side surfaces of the metal diffusion barrier layer of the composite current collector; elements on the outer side of the copper metal layer, the metal diffusion barrier layer and the inner side of the oxygen-containing sputtering layer are mutually doped to form a mixed transition structure. The copper layer, the metal diffusion barrier layer and the oxygen-containing sputtering layer form a mixed transition structure through element doping, so that a compact anti-oxidation barrier is formed, and low resistivity is kept; on the basis of oxidation resistance, the conductivity of the copper substrate is kept, and the interface energy is reduced through the mixed transition structure, so that the current collector is more stable, and the conductivity is further improved.

The invention relates to the technical field of alloy-plated copper wire production, and provides a tin-plated copper wire and a preparation method thereof.The tin-plated copper wire comprises a copper core and a tin alloy plating layer, and the tin alloy plating layer comprises the following components: 0.02-0.05 wt% of La, 0.01-0.05 wt% of Cu, 0.01-0.05 wt% of Ti, 0.01- 0.01 wt% to 0.03 wt% of P; 0.10 to 0.30 wt% of Cu; and the balance of Sn. 0.01-0.03 wt% of P can achieve a very good deoxidation effect, so that the oxygen content of the prepared tin alloy coating is reduced, oxide inclusion is reduced, 0.10-0.30 wt% of Cu and Sn form a solid solution, coating grains are refined together with 0.02-0.05 wt% of La, La can inhibit diffusion of copper and tin atoms at high temperature, generation of brittle intermetallic compounds such as Cu3Sn and Cu6Sn5 is reduced, a copper matrix is purified, element enrichment and internal defects are reduced, and the service life of the coating is prolonged. And the interface bonding force between the plating layer and the copper core is enhanced, and the cracking and falling probability of the plating layer is reduced. And La can optimize the microstructure of the plating layer, reduce pores and defects, improve the compactness of the plating layer and further enhance the corrosion resistance, so that the tinned copper wire prepared from the tin alloy plating layer on the copper core can stably adapt to a high-temperature packaging scene of electronic equipment.

The application discloses a preparation method of a copper-chromium-niobium-zirconium alloy for an electromagnetic railgun guide rail, and comprises the following steps: S1, the copper-chromium-niobium-zirconium alloy comprises Cr: 0.8-1.2%, Nb: 0.10-0.20%, Zr: 0.10-0.20%, and Cu: the balance, raw materials are prepared according to the element composition, then smelting is carried out, and a cylindrical ingot is cast; S2, the cylindrical ingot after the step S1 is subjected to homogenization annealing treatment; S3, the cylindrical ingot after the homogenization annealing treatment in the step S2 is subjected to hot extrusion; S4, the hot extruded profile after the step S3 is subjected to solid solution treatment; S5, the solid solution ingot after the step S4 is subjected to cold drawing / cold forging deformation treatment; S6, the semi-finished product after the step S5 is subjected to aging treatment, and the copper-chromium-niobium-zirconium alloy is obtained. Through the interaction between chromium, zirconium, niobium elements and the copper matrix, the strength and hardness of the alloy are greatly improved, and high-strength, high-conductivity and high-temperature resistance can be realized.

This invention belongs to the field of superconducting wire technology and relates to a copper-aluminum matrix NbTi superconducting wire and its preparation method. This invention provides a copper-aluminum matrix NbTi superconducting wire, comprising grooved wires and superconducting circular wires; the grooved wires are aluminum grooved wires with copper-coated surfaces; the superconducting circular wires are NbTi / Cu / Al composite wires with copper-coated surfaces. This invention uses an NbTi / Cu / Al / Cu superconducting circular wire structure and aluminum grooved wires with copper-coated surfaces to prepare copper-aluminum matrix NbTi superconducting wires, solving the technical problem that conventional copper-based NbTi superconducting wires cannot simultaneously achieve both cost and performance.