76 results about "Silver copper" patented technology

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 discloses a metalized diamond particle, a diamond / gallium-based liquid metal composite material and a preparation method thereof, and belongs to the field of composite thermal interface materials. The metallized diamond particle comprises a diamond particle, the surface of the diamond particle is coated with an immiscible alloy layer, the immiscible alloy layer contains a diffusion barrier component and a reaction wetting component, and the content of the diffusion barrier component in the immiscible alloy layer is not higher than 15 at% of the total content of the diffusion barrier component and the reaction wetting component; wherein the diffusion barrier component is one or more of tungsten, molybdenum and tantalum, and the reaction wetting component is one or more of silver and copper. The metallized diamond particles and the gallium-based liquid metal are combined to form the composite material, so that the diamond / gallium-based liquid metal composite material has more excellent thermal conductivity.

The invention relates to silver-copper-titanium active soldering paste with a high recovery coefficient and a preparation method and application of the silver-copper-titanium active soldering paste, and belongs to the technical field of heterogeneous material connection and semiconductor packaging. The silver-copper-titanium active soldering paste is composed of, by mass, 70%-90% of brazing filler metal powder and 10%-30% of scaling powder. The brazing filler metal powder is mixed powder composed of silver-copper-based powder, titanium-containing powder and other metal powder. The soldering flux is composed of, by mass, 40%-70% of a solvent, 20%-40% of rosin, 5%-20% of an active agent, 1%-15% of a thixotropic agent, 1%-10% of an interface modifier and 1%-10% of a corrosion inhibitor, and the thixotropic agent is composed of a short-range agent and a long-range agent according to the mass ratio of 1: (1-4). The recovery coefficient of the obtained soldering paste is close to 1, and the soldering paste has excellent printability, sagging resistance and storage stability and has wide application prospects in the fields of semiconductor packaging, power electronic devices, aerospace and the like.

The invention discloses an ultralow dielectric constant LTCC (Low Temperature Co-Fired Ceramic) material and a preparation method thereof, the ultralow dielectric constant LTCC material is formed by compounding a glass phase and a ceramic filler phase, the glass phase comprises Li2O, La2O3, SiO2, ZrO2, P2O5, MgF2 and Al2O3; the ceramic filler phase comprises BaB2O4 and a conditioning agent, and the conditioning agent is at least one of Al2O3, SiO2 or cordierite; according to the invention, the Li-La-Si system glass and the BaB2O4 filler are compounded according to a specific proportion, so that co-firing with a silver / copper electrode at a low temperature is realized, and the composite material has excellent thermal stability and environmental friendliness, and meets the requirements of high-frequency communication applications such as 5G millimeter waves and the like on high-performance substrate materials.

This invention relates to a high-hardness, high-strength palladium-silver-copper-nickel quaternary alloy rod for probes and its preparation method. The elemental composition of the palladium-silver-copper-nickel quaternary alloy rod, by mass percentage, is: Pd 30-38%, Cu 40-46%, Ag 10-20%, Ni 8-15%; the sum of the mass of Ag and Ni is 18-30%, and the sum of the mass of Pd and Ni is 41-50%. The heat-treated palladium-silver-copper-nickel quaternary alloy rod has a hardness greater than 300 HV and a strength greater than 1000 MPa. The invention utilizes relatively low-cost nickel as a key strengthening element, synergistically strengthening it with silver and copper in an alloy matrix with a low palladium content. Combined with an efficient and high-quality forming process, a balance between high hardness and high strength is achieved in the alloy while maintaining controllable costs, meeting the stringent requirements of testing probes.

The invention discloses a preparation method and application of a silver-copper gas transmitting and dispersing electrode. The preparation method comprises the following steps: S1, preparing a copper-based gas transmitting and dispersing electrode; and S2, preparing a silver-copper gas transmitting and dispersing electrode: obtaining the silver-copper gas transmitting and dispersing electrode. The silver-copper gas transmitting and dispersing electrode is applied to electrocatalytic carbon dioxide reduction reaction. According to the invention, silver nanoparticles are loaded on the surface of the copper-based gas transmitting and dispersing electrode through a proper method, and when the electrode is applied to an electro-catalysis carbon dioxide reduction reaction, CO generation on the surface of the electrode can be effectively improved, so that the CO coverage of nearby copper sites is improved; meanwhile, concentrated seawater is used as a cathode electrolyte, a high cation environment is provided, and a supply balance relation formed by metal cations and H < + > is realized under an acidic condition, so that an excessive HER process under the acidic condition is avoided, precipitation of calcium and magnesium ions is inhibited, and the overall economic benefit can be improved.

The utility model provides a kind of high-performance conductive foam, it is related to the field of isolation shielding.The utility model includes foam main body, the outer surface of foam main body is connected with elastic conductive intermediate layer, elastic conductive intermediate layer is the composite material of carbon nanotube and graphene, the outer surface of elastic conductive intermediate layer is connected with metal plating, metal plating is silver copper alloy material quality, the outer surface of metal plating is connected with conductive macromolecular fiber layer.The beneficial effects of the utility model include: first, replace traditional conductive layer carbon coating by the cooperation of elastic conductive intermediate layer, metal plating and conductive macromolecular fiber layer, so as to avoid the easy cracking or falling off of conductive layer, conductive macromolecular fiber layer has greater flexibility, further avoids the problem of cracking and falling off, as described above, this kind of high-performance conductive foam is by using macromolecular fiber and optimizing its flexibility, not only improves its durability and reliability, very practical.

The invention discloses silver-copper paste based on a double-closed curing agent and a printed radio frequency identification tag. The silver-copper paste comprises silver powder, silver-coated copper powder, polyurethane resin and a blocked isocyanate curing agent, the blocked isocyanate curing agent comprises a low-temperature deblocking curing agent and a high-temperature deblocking curing agent, the deblocking temperature of the low-temperature deblocking curing agent is R1, the deblocking temperature of the high-temperature deblocking curing agent is R2, R1 and R2 meet the condition that R1 is larger than 70 DEG C, smaller than 140 DEG C and smaller than 140 DEG C, and R1 is larger than or equal to R1 and smaller than or equal to R2. R2-R1 is more than 20 DEG C and less than 50 DEG C; after the silver-copper paste is printed into the antenna, low-temperature curing is carried out at the temperature T1, and the low-temperature deblocking curing agent is activated; then carrying out flattening treatment; then carrying out high-temperature curing at the temperature T2, and activating a high-temperature deblocking curing agent; t1 and T2 satisfy R1 < = T1 < R2 < = T2. According to the invention, the negative effect of a compression roller process on a silver copper paste printed antenna is effectively solved, and the formation of a high-conductivity, stable and consistent conductive antenna is ensured.

The invention provides a silver-copper alloy-copper penetrating type composite belt and a preparation method thereof. The silver-copper alloy-copper penetrating type composite belt comprises a copper base body and a silver-copper alloy penetrating body arranged in the copper base body in a penetrating mode, the copper content in the silver-copper alloy penetrating body is 20 wt%-40 wt%, and a diffusion layer of 0.5-2.0 micrometers is formed between the copper base body and the silver-copper alloy penetrating body. The core technical problems that an existing silver-copper composite fusing material is poor in thermal shock stability, low in breaking consistency and unstable in interface bonding structure are solved. The invention further provides a preparation method of the silver-copper alloy-copper penetrating type composite belt.

The utility model relates to the technical field of winding devices, and discloses a silver-copper alloy strip winding device capable of synchronously cleaning ash, which comprises a conveying roller, a flushing assembly, a blowing assembly, a scraping and brushing assembly, a wiping assembly and a winding assembly are sequentially arranged at the discharge end of the conveying roller, a plurality of injection pipes are arranged on the flushing assembly, and the blowing assembly and the scraping and brushing assembly are arranged on the winding assembly. An injection opening of the injection pipe is obliquely arranged towards the winding assembly and one side of a preset strip, the injection assembly comprises two injection pipes, the two injection pipes are arranged on the upper side and the lower side of the strip respectively, the injection direction of the injection pipes is the same as that of the injection opening, and the scraping and brushing assembly and the wiping assembly are both attached to the two surfaces of the strip at the same time. According to the device, the problem that the surface is scratched due to the fact that particles are prone to being left is solved, the surface particles are removed in cooperation with washing and scraping brushing, and the finished product quality is guaranteed while the cleaning effect is improved.

This application discloses a silver-copper paste and a printed RFID tag based on a dual-sealing curing agent. The silver-copper paste comprises silver powder, silver-coated copper powder, polyurethane resin, and a sealing isocyanate curing agent. The sealing isocyanate curing agent includes a low-temperature unsealing curing agent and a high-temperature unsealing curing agent. The unsealing temperature of the low-temperature unsealing curing agent is R1, and the unsealing temperature of the high-temperature unsealing curing agent is R2. R1 and R2 satisfy 70℃ < R1 < R2 < 140℃, and 20℃ < R2 - R1 < 50℃. After the silver-copper paste is printed into an antenna, it undergoes low-temperature curing at temperature T1 to activate the low-temperature unsealing curing agent; then it undergoes flattening treatment; and finally, it undergoes high-temperature curing at temperature T2 to activate the high-temperature unsealing curing agent. T1 and T2 satisfy R1 ≤ T1 < R2 ≤ T2. This application effectively solves the negative effects of the pressure roller process on the printed antenna of the silver-copper paste, ensuring the formation of a high-conductivity, stable, and consistent conductive antenna.

The invention discloses a conductive reinforced phase material and an in-situ preparation method thereof, and belongs to the technical field of core electric contact materials for switches. The reinforced phase material is Ti3AlC2-coated Al2O3 and is composed of an inner layer and an outer layer in the coaxial direction, the inner layer is of a hollow cylindrical structure, the component of the inner layer is Ti3AlC2, and the outer layer is an Al2O3 coating layer generated on the surface of the inner layer in situ. The in-situ preparation method comprises the following steps: by taking a carbon nanotube as a template and eutectic molten salt as a carrier, preparing the conductive reinforced phase material with the double-layer concentric cylindrical composite structure through vacuum freeze drying, molten salt shielding reaction and high-temperature and high-pressure oxidation treatment. Compared with an original MAX-phase powder reinforced metal-based electric contact composite material and a commercial metal-based electric contact composite material, the novel material is compounded with conductive metal powder such as silver and copper, the electric conduction and heat conduction performance and the arc erosion resistance of the electric contact composite material can be remarkably enhanced, and the potential of replacing a traditional electric contact material is huge.

The present application provides a kind of light wear-resistant bacteriostatic medical coating, including titanium transition layer, and diamond-like carbon film layer in the surface of titanium transition layer, silver and copper are contained in the diamond-like carbon film layer;And the preparation method of light wear-resistant bacteriostatic medical coating, including S1: raw material preparation and pretreatment;S2: Ar ion etching;S3: Ti transition layer deposition;S4: Ag, Cu co-doped deposition;S5: cooling, breaking vacuum.This technical solution has broad-spectrum bacteriostatic effect, and high bacteriostatic rate, reaches high-efficiency sterilization under lower total metal content, reduces endoscope related cross infection problem;Meanwhile, the coating has strong chemical inertness, dense structure without pore, resists multiple disinfection methods, titanium transition layer and silver copper doped structure do not dissolve, do not fail, avoid the problem that traditional antibacterial coating rapidly degrades, fails, falls off after repeated disinfection, meanwhile, the corrosion of disinfection medium to internal metal matrix is isolated, the performance of instrument is stable.

The invention discloses a stainless steel oxygen-free copper embedded T / R shell and a preparation method thereof. The shell comprises a 316L stainless steel shell body, a TU1 oxygen-free copper substrate, a radio frequency connector, a stress gradient slow release ring and a low-frequency connector. The preparation method comprises the following steps: cleaning and annealing each component; the weldability is enhanced by pre-plating nickel; the shell, the substrate and the stress slow release ring are assembled through silver-copper brazing; after nickel / gold electroplating, a plating layer on the sealing and welding surface is removed through laser; and installing the radio frequency / low frequency connector to the kovar ring through gold-tin brazing. Through gradient material design and a step-by-step brazing process, the problem of sealing failure caused by thermal expansion coefficient mismatch is solved, and the high-power heat dissipation performance and the airtight reliability are remarkably improved.

The invention discloses a flexible sensor based on a nanowire array and a one-step electrochemical synthesis process thereof, and relates to the technical field of nano materials and sensors, and the one-step electrochemical synthesis process comprises the following steps: preparing an electrolyte containing silver nitrate, copper sulfate and a supporting electrolyte, the silver nitrate and the copper sulfate having a specific molar ratio; selecting a proper flexible substrate; a three-electrode system is adopted, and silver ions and copper ions in the solution are subjected to electrochemical reduction reaction on the surface of the flexible substrate to sequentially achieve silver core formation and copper atom deposition, so that a silver-copper core-shell nanowire array structure is constructed; metal electrodes are deposited at the two ends of the nanowire array through magnetron sputtering or electron beam evaporation and the like, and a flexible packaging material is adopted to package the sensor so as to ensure the stability and reliability of the sensor. Through the electrochemical synthesis process, the problems that a traditional multi-step preparation method is high in production cost, low in nanowire size and distribution control precision and poor in product consistency are solved, high-quality preparation of nanowires and integrated construction of the sensor are achieved, the production cost is reduced, and the production efficiency is improved. And the application of the system in the fields of wearable equipment, biomedical monitoring, intelligent robots and the like is expanded.

The present application relates to the technical field of noble metal sputtering target material, and provides a kind of superfine grain silver copper alloy containing nano precipitated phase and its preparation method and application.The superfine grain silver copper alloy provided by the present application includes copper 0.1-3wt% and the balance Ag, and its phase composition includes silver-rich matrix phase and copper-rich nano precipitated phase dispersed in the silver-rich matrix phase, the average grain size of silver-rich matrix phase is 100-1000nm, and the average grain size of copper-rich nano precipitated phase is 10-50nm.The present application adopts microalloying method, combines large deformation plastic processing and lower annealing temperature, and prepares superfine grain silver copper alloy with excellent performance and submicron grain size, and the silver copper alloy of the present application is used as target material, which is beneficial to improve the sputtering rate and obtain silver copper alloy film with uniform thickness.

A multilayer composite thermally-conductive sheet, a preparation method therefor and use thereof are provided. The multilayer composite thermally-conductive sheet includes a metal foil, two transition layers provided on two opposite side surfaces of the metal foil, and two low-temperature alloy layers respectively provided on surfaces of the transition layers facing away from the metal foil, wherein the metal foil is made from at least one of silver, copper, zinc, and platinum, the transition layers are made from either indium or tin, the transition layers have a thickness of 5-13 μm; and a melting point of the low-temperature alloy layers is 30-300° C.

The invention relates to the technical field of slurry grinding, and discloses a high-reliability low-sintering-temperature silver-copper co-fired slurry grinding device which comprises a shell and a supporting roller in the shell, four sets of grinding rollers surround the periphery of the supporting roller, adjacent reverse rotation is achieved through driving of a gear transmission structure, the rotating speed is increased step by step, and the gap between the rollers is decreased step by step; an adjusting assembly is arranged at the end of the grinding assembly and can drive four rollers to synchronously contract or expand, and the preset gap gradient is accurately maintained during gap adjustment; a feeding assembly with an opening and closing plate is arranged at the gap between the first roller and the second roller, a discharging assembly is arranged on the side of the shell, and a limiting scraping plate is arranged on the side of the supporting roller. According to the device, step-by-step fine grinding of slurry is achieved, dripping waste of the slurry is greatly reduced, automatic circulating grinding under the same gap level can be completed, and the gap adjusting efficiency and precision are improved; inert gas can be introduced into the closed shell, copper phase oxidation is effectively restrained, the purity and using performance of the electronic-grade silver-copper co-fired slurry are guaranteed, and the grinding process requirements of the electronic-grade silver-copper co-fired slurry are met.

The application relates to the technical field of electromagnetic shielding materials, in particular to a shielding cover based on a silicon rubber conductive glue and a preparation method thereof. An aluminum-magnesium alloy raw material is pressure-cast to form a shielding shell; a composite magnetic adhesive, a silver-carrying copper conductive composite adhesive and a silver-carrying conductive composite adhesive are sequentially spot-coated at fixed positions of the shielding cover, vulcanization and packaging are carried out, and a finished product is obtained. The finished product prepared by the application has excellent electromagnetic shielding performance, so that the application has a wide application prospect in the technical field of electromagnetic shielding materials.

The utility model relates to packing film processing technical field discloses a kind of smoothing mechanism for nano silver copper packing film processing, including processing table;Motor one, the motor one is installed in the inside of the processing table;Intermeshing gear and rack plate, the gear is fixedly connected in the output end of the motor one;Connecting plate and mounting block, the connecting plate is fixedly connected in the outside of the rack plate, the mounting block is fixedly connected in the bottom of the connecting plate;Smoothing scraper, the smoothing scraper is installed in the inside of the mounting block, smoothing scraper outside is provided with smooth coating;And dismounting component. In the utility model, it is realized by the traditional smoothing mechanism to change packing film constantly from the lower part of smoothing scraper by the roller rolling pressure of multiple adoption, it is convenient to remove bubble and wrinkle on packing film, ensure the surface flatness of packing film, to improve the conductivity and sealing property of product.

The application relates to a process flow for extracting uranium, tungsten, tin, copper, iridium, gold and silver from waste uranium ore, which comprises the following steps: waste ore dressing: crushing the waste uranium ore, sequentially performing electroseparation-primary separation-dressing to obtain dressing ore, mixing the dressing ore with concentrated sulfuric acid and sintering, and then using concentrated sulfuric acid for leaching again to obtain first leaching liquid and first leaching residue. Leaching liquid treatment: sequentially electrolyzing and replacing silver and copper from the first leaching liquid, adding ammonia water and caustic soda, and then separating and filtering to obtain uranium compound precipitate. Leaching residue treatment: separating weak magnetic metal and strong magnetic metal from the first leaching residue through electromagnetic separation, adding aqua regia to the weak magnetic metal to leach gold, obtaining fourth leaching liquid and second leaching residue, and reducing the fourth leaching liquid to obtain gold powder; mixing the strong magnetic metal with alkali and sintering, adding pure alkali and water after grinding to obtain fifth leaching liquid and third leaching residue. Through the above method, the dressing ore with a higher grade is screened from the low-grade waste uranium ore, and then silver, copper, uranium, gold, tin, tungsten and iridium are sequentially separated.

The application provides a preparation method of silver-copper alloy nanoparticles, which comprises the following steps: mixing and dissolving silver nitrate, copper acetate monohydrate, polyvinylpyrrolidone and ethylene glycol, obtaining a mixed solution after carbon dioxide gas blowing treatment, carrying out rapid cooling treatment in a cold water bath after heating treatment of the mixed solution through an oil bath, carrying out centrifugal separation, carrying out vacuum oven drying treatment, preparing an electrode from the obtained solid product, and carrying out electrochemical reduction treatment in an electrochemical cell to obtain a target product. The application realizes the successful preparation of silver-copper alloy nanoparticles, and the silver-copper alloy nanoparticles with adjustable silver / copper molar ratio can be obtained by changing the feeding ratio of silver nitrate and copper acetate monohydrate, so that the silver-copper alloy nanoparticles can be applied to the electrocatalytic carbon dioxide reduction reaction, and the catalytic performance with high selectivity to high-value-added products can be obtained.

A kind of circuit breaker movable contact assembly, welding device and welding method thereof, including movable support and movable contact of movable support end surface, the movable support is copper alloy material, the movable contact is high-strength silver alloy material, the bottom of the welding surface of the movable contact is provided with several convex ribs along width arrangement, the welding surface of the movable contact is sufficient for product welding Silver filling amount, without additional any solder when the movable contact assembly product welding, using the silver layer of contact welding surface and copper alloy support can complete the welding of product by resistance spot welding process, the weld area of movable contact and movable support is not obvious gap, movable contact has been embedded in the inside of support, so that both have silver copper alloy chemical action, and physical combination of larger plastic deformation, finally obtain higher quality joint strength.

The invention belongs to the field of brazing materials, and provides a silver-copper welding material for a metal shell of a ceramic side wall and a preparation method of the silver-copper welding material. A core-shell composite structure design is adopted, a silver-copper matrix core serves as a core, and the surface of the silver-copper matrix core is coated with a titanium-copper intermetallic compound shell layer; the shell layer is formed by diffusion reaction of titanium and copper in the silver-copper matrix core and is connected through a metallurgical bonding interface, the content of silver ranges from 53.4 parts to 74.9 parts, the content of copper ranges from 22.1 parts to 46.4 parts, the content of titanium ranges from 0.2 part to 3.0 parts, silver powder and copper powder are mixed, pressed, sintered, annealed and rolled to form the matrix core, a titanium layer is deposited through magnetron sputtering, and the shell layer is converted into an intermetallic compound shell layer through diffusion annealing. The active wettability, metallurgical bonding strength, thermal cycle reliability and storage stability are remarkably improved, meanwhile, the contradiction between active wettability enhancement and interface brittleness in ceramic-metal brazing and the contradiction between the high coverage rate of the shell layer and phase structure controllability and the contradiction between the shell layer and the storage stability are solved, and wide electronic packaging application value is achieved.

The application provides a preparation method of a multilayer lateral composite strip for a fuse, and specifically comprises the following steps: vacuum smelting and pouring oxygen-free copper into a plate with N square grooves, then putting silver blocks into the square grooves, heating under a protective gas, and then hot pressing by an extruder; then heating under a protective gas, opening and breaking by concave-convex rollers, milling off the upper and lower surfaces, and finishing rolling to a finished product. The square groove structure can accurately position the silver layer, save noble metals to the maximum extent, and ensure that the circuit protection equipment is cut off when an abnormal current appears in the circuit; through the concave-convex roller rolling composite, the problem of cracks generated between the silver and copper interfaces and the poor lateral bonding strength can be effectively solved, so that the bonding strength is firm and reliable, the lateral composite strength is high, and the yield is high. Moreover, the strip manufactured by the method has stable performance and can be mass-produced.

A silicon-carbon composite material, and a preparation method therefor and the use thereof. The silicon-carbon composite material comprises a porous silicon core and a coating carbon layer that coats the porous silicon core, wherein each of the porous silicon core and the coating carbon layer comprises a first doping element and a second doping element; the first doping element comprises at least one of silver and copper; the second doping element comprises at least one of boron, aluminum and gallium; the first doping element accounts for 0.2-5% by mass of the silicon-carbon composite material; and the second doping element accounts for 0.5-4% by mass of the silicon-carbon composite material.

The application relates to the technical field of conductive paste, and discloses a low-silver copper graphite conductive paste as well as a preparation method and application thereof. The paste comprises solid-phase conductive powder and an organic carrier, and the solid-phase conductive powder is composed of copper graphite composite powder, silver-coated copper powder and nano silver powder. The solid-phase conductive powder is prepared by mixing electrolytic copper powder and flake graphite powder, compression molding, pre-burning and sintering to obtain copper graphite carbon brushes, and then ball milling, drying and screening. The organic carrier comprises acrylic resin, a solvent, a dispersing agent, a thixotropic agent and a copper passivation agent. The paste is prepared by mixing, grinding and vacuum deaerating the solid-phase conductive powder and the organic carrier. The paste can form a conductive drainage layer at 230-270 DEG C for 30-90 s, the curing temperature is fully compatible with the passivation layer process of a TOPCon solar cell, the silver consumption is greatly reduced compared with traditional silver paste, and the paste can be used for preparing a conductive drainage layer on the back surface of a TOPCon solar cell.

This invention provides a silica sol composite curing agent, its preparation method, and its application in fuses. The silica sol composite curing agent incorporates acidic silica sol and calcium oxide powder as raw materials. The self-heating reaction between calcium oxide and water in the acidic silica sol enables rapid curing, significantly reducing curing time and improving production efficiency. The raw materials also include nano-Fe powder and a Cu corrosion inhibitor, which enhances the oxidation and corrosion resistance of Cu, further improving the oxidation resistance of the silver-copper composite fusible material in the fuse. This allows fuses using the curing agent to prevent oxidation and corrosion of the silver-copper composite fusible material, ensuring stable resistivity and interfacial bonding strength. Simultaneously, the uniform mixing of the raw materials in the curing agent improves the uniformity of the fuse arc-extinguishing filler, effectively reducing copper strip corrosion and maintaining the stable resistivity of the silver-copper composite fusible material in the fuse.

The utility model relates to K type fuse wire technical field, concretely is a kind of K type fuse wire, the utility model includes fuse, recess ring one and recess ring two are set up in the side wall of fuse, the depth of recess ring one is greater than the depth of recess ring two, the length of recess ring one is equal to the length of recess ring two, the fuse includes matrix layer, the material of matrix layer is silver copper alloy, matrix layer inside evenly distributed has dispersion layer, the material of dispersion layer is nano alumina particle, matrix layer outside is coated with surface coating, the material of surface coating is low melting point metal tin;Through the matrix layer of silver copper alloy guarantee its high efficient conductivity, the dispersion layer of nano alumina particle promotes the current-carrying capacity of fuse, low melting point metal tin shortens fusing response time, changes the connection position of fuse, current passes through recess ring one or recess ring two, the depth of two is different, and the current-carrying capacity is different, thereby adapt to high current or low current, improve the accurate fusing capacity of fuse wire.

The invention provides composite silver-copper brazing filler metal, soldering paste and a preparation method and a brazing method of the composite silver-copper brazing filler metal and the soldering paste, and belongs to the field of brazing. The composite silver-copper brazing filler metal comprises first metal powder and second metal powder, the first metal powder is silver-copper alloy powder, and the mass fraction of Ag is 70-80 wt%; the second metal powder has no flowability or has flowability lower than that of the first metal powder in a brazing temperature zone, has intermiscibility or reaction activity higher than that of the first metal powder on a copper-based base material, and has a mass fraction of less than 15 wt%; wherein the second metal powder is configured to form a network framework with communicating pores in the process of heating to the brazing temperature, and the network framework at least partially wraps a silver-copper melt formed by melting the first metal powder. According to the composite silver-copper brazing filler metal, the soldering paste and the preparation method and the brazing method of the composite silver-copper brazing filler metal, the soldering paste, the preparation method and the brazing method of the composite silver-copper brazing filler metal and the soldering paste, brazing seams with tidy boundaries and low void ratio can be obtained on the premise of not sacrificing the silver-copper system strength and heat conduction and electric conduction advantages.