30results about How to "Avoid embrittlement" patented technology

The application relates to the technical field of lithium battery diaphragm, in particular to a high-stability lithium battery diaphragm and a preparation method thereof. The high-stability lithium battery diaphragm is prepared by the following steps: after a polypropylene film is irradiated by ozone and ultraviolet light in sequence, pre-deposition and pre-grafting are carried out on the surface of the polypropylene film, and then ultraviolet radiation treatment is carried out. The application realizes synergistic effect of nano-enhancement and self-repairing, solves the stability problem of traditional PP diaphragms in long-term cycles, and provides a reliable diaphragm solution for high-energy-density lithium batteries.

The utility model provides a kind of plastic coating device applied to metal tubular product inner wall, it is specifically related to tubular product inner wall plastic coating technical field.The device includes pit, PLC controller and device ontology;The device ontology includes the base of immediate pit rear side ground installation;The base top is close to pit one side and is provided with mounting stand;The mounting stand is rotationally provided with carousel away from the side of base;The carousel is close to pit one side and is fixed with connecting disc;The pit is provided with bunker box;The top of bunker box is provided with fixed platform;The rear end of fixed platform is fixed with the front end bottom of connecting disc;Bunker box is rotated 360 ° clockwise or counterclockwise with carousel by connecting disc.Compared with traditional plastic coating equipment, the utility model is lower for metal tubular product inner surface cleanliness requirement, convenient recovery plastic coating material, plastic coating effect is uniform and can be applied to multiple size, multiple shape tubular product plastic coating process.

The utility model relates to the technical field of tow drying, and discloses a device for drying tows by using hot air, which comprises a base, an air outlet shell is fixedly connected onto the base, an outer shell is fixedly connected onto the air outlet shell, tensioning wheels are rotatably connected onto the inner walls of the left side and the right side of the outer shell, and an air return shell and a partition air duct are fixedly connected onto the inner wall of the outer shell. A heating wire is arranged in the partition air channel and fixedly connected to the inner wall of the shell, a connector is fixedly connected to the heating wire, second ventilation holes are formed in the positions, corresponding to the partition air channel, of the outer walls of the two sides of the air return shell, supporting plates are arranged on the partition air channel at intervals, and first ventilation holes are formed in the supporting plates. According to the utility model, the air duct partition structure is designed, the temperature of each partition is independently controlled, the hot air temperature of each partition can be accurately controlled, and the hot air temperature in each partition can be flexibly adjusted according to the decreasing trend of the water content in the tow drying process.

This invention relates to the field of welding deformation prevention technology and provides a welding deformation prevention and fixing device for membrane wall tubes. The device includes a welding table with a fixing frame fixedly connected to it. The fixing frame has a fixing mechanism, and the fixing mechanism contains a cooling channel that can be connected to an external water-cooling tank via a water pipe and pump. The device also includes a control system comprising a clamping pressure adaptive control module. This module constructs an adaptive control model based on a reference clamping force, transient instability probability, and current wall tube vibration intensity, outputs a dynamic clamping force setpoint, and controls the fixing mechanism. This invention can dynamically adjust the clamping force of the fixing mechanism according to the transient instability probability and real-time vibration intensity of the membrane wall tube during welding. This makes the clamping force no longer a static preset value but can respond in real time to dynamic changes during welding, effectively addressing the problem of insufficient static constraint force when instantaneous thermal stress or vibration intensification occurs.

The invention relates to the technical field of composite films, in particular to a flame-retardant composite film and a preparation method thereof. The composite film is of an ABA type symmetrical three-layer co-extrusion structure, and functional division and synergistic interaction are achieved by concentrating a main flame-retardant function on a core layer (B layer) and distributing hydrolysis resistance and mechanical enhancement functions on a surface layer (A layer). The layer A comprises crystalline polyester, reinforcing master batch and an interface reinforcing agent; the layer B comprises crystalline polyester and composite flame-retardant master batch; the preparation method mainly comprises the following steps: respectively preparing the reinforced master batch and the composite flame-retardant master batch; respectively mixing the raw materials of the layer A and the layer B, drying and melting; co-extruding and casting through a three-layer co-extrusion die head with gradient temperature field control, and quenching a cast sheet; and preheating the cast sheet, and then carrying out synchronous two-way stretching, heat setting and cooling rolling. The film prepared by the invention has excellent halogen-free flame retardance, outstanding damp-heat aging resistance and high mechanical strength, and is suitable for the field with strict requirements on safety and durability.

The present application relates to a kind of low-carbon low-alloy welding wire and its preparation and welding method, belong to welding material technical field, solve the existing welding wire for high-strength material welding when easily produce hot crack, pore, coarse grain and other defects and weld metal's strength and low temperature toughness is insufficient, with the problems such as poor performance matching of base material.The present application provides a kind of low-carbon low-alloy welding wire, the component in the welding wire is as follows according to mass percentage: C 0.04~0.08%, Si 0.30~0.50%, Mn 1.6~2.0%, Cr 0.15~0.35%, Ni 3.5~4.0%, Cu 0.008~0.01%, Mo 0.007~0.01%, V 0.0005~0.001%, Ti 0.02~0.07%, Al 0.01~0.018%.The welding wire is designed by component, significantly improve the mechanical properties and low temperature toughness of welded joint, especially suitable for the welding of P690QL2 steel;Combined with the welding method of use, welding performance is better.

The application relates to the technical field of hoisting belts, and provides a flexible bearing material for a fatigue-resistant high-strength hoisting tool and a preparation method thereof. The material takes UHMWPE fibers or aramid fibers as a substrate, is activated by low-temperature oxygen plasma, is sequentially subjected to glycidyl methacrylate grafting to introduce epoxy sites, end-amino hyperbranched PAMAM chain extension to construct a multistage active interface, is subjected to a silane coupling agent containing a benzotriazole group to construct a weather-resistant layer, is then loaded with a negative nano-titanium dioxide and polyethylene imine composite system, and is finally crosslinked and solidified by ethylene glycol diglycidyl ether. The application strengthens the interface bonding force through a multistage covalent bonding surface modification structure, simultaneously improves the fatigue resistance, weather resistance and wear resistance of the material, and solves the problems of weak interface bonding of existing hoisting bearing materials, easy wear and aging in cyclic service, and short fatigue life.

The utility model discloses a safety pressure relief valve structure of a high-pressure storage tank of a hydrogen energy storage system. The safety pressure relief valve structure comprises a pressure relief valve shell, a pressure relief valve element and a pressure relief valve body which are sequentially connected to form a pressure relief channel. A through opening is formed in the end, connected with the pressure relief valve element, of the pressure relief valve shell, and a plugging block pressed at the through opening through a spring is arranged in the pressure relief valve element. A sealing groove is formed in the pressure relief valve body, a plurality of graphite rings are arranged in the sealing groove, honeycomb holes communicated with the sealing groove are further formed in the pressure relief valve body, and pressure relief holes communicated with the honeycomb holes are formed in the tail end of the pressure relief valve body. According to the safety relief valve structure of the high-pressure storage tank of the hydrogen energy storage system, a main sealing interface is formed by the plugging block pre-tightened by the spring and the through opening, a labyrinth type sealing path is formed in cooperation with the staggered notch of the graphite ring, double-sealing protection is achieved, the sealing position of the plugging block can be adjusted in a self-adaptive mode along the guide sliding groove when pressure fluctuates, the contact pressure of the sealing face is effectively balanced, and the safety of the high-pressure storage tank of the hydrogen energy storage system is improved. The sealing reliability under the long-term high-pressure working condition is remarkably improved, and leakage of trace hydrogen is avoided.

The utility model provides a kind of welding cooling device of stator bar, including clamp and air cooling clamping monomer, two air cooling clamping monomers are placed axially symmetrical and constitute air cooling clamp, two ends of air cooling clamp are clamped by clamp, the inside of air cooling clamping monomer is equipped with several ventilation grooves and two horizontal air ducts, and the side of air cooling clamping monomer is equipped with first air inlet, second air inlet and stator bar clamping groove.The utility model has the beneficial effects that (1) dry cooling eliminates the risk of damp, guarantees insulation performance;(2) multi-channel airflow structure realizes uniform and efficient heat dissipation;(3) double air inlet linkage heat dissipation.

This invention relates to the field of tobacco processing technology, and particularly to a sweet-scented granular tobacco stem and its processing technology. The processing technology includes the following steps: S1, Preparation of coarse granular tobacco stem: The tobacco stem raw materials are screened by size, washed, stored, pressed, cut once, and cut twice to obtain coarse granular tobacco stem; S2, Popping the stem in a popcorn machine: The coarse granular tobacco stem is fed into a popcorn machine for roasting, kept warm and pressurized, and then quickly depressurized to normal pressure to obtain granular tobacco stem with a uniform microporous structure; sieving; S3, Flavoring the tobacco stem: The sieved granular tobacco stem is fed into a roasting equipment, a natural sweetener is added, and roasting is performed, controlling the moisture content between 12-14%, to obtain the finished sweet-scented granular tobacco stem. The sweet-scented granular tobacco stem obtained by this invention has a regular and uniform shape, rich flavor layers, and a long aroma retention time. The overall quality of the tobacco stem is significantly improved, and it can be effectively applied to cigarette production to enhance the competitiveness of cigarette products.

This invention relates to the field of spacecraft thermal control technology, specifically to a fiber-reinforced flexible composite substrate for deployable space radiators and its preparation method. The method first involves cryogenically treating polyimide fibers with liquid nitrogen, weaving them into a fabric, and then subjecting them to gradient heating and surface carbonization to obtain a carbonized fiber-woven reinforcement. Simultaneously, boron nitride nanosheets and carbon nanotubes are covalently linked via amide bonds and coated with polydopamine to obtain a composite thermally conductive filler, which is then dispersed in polyimide resin. Finally, the resin is impregnated onto the surface of the reinforcement and the interior of the fiber bundles, and then cured to obtain the final product. In this invention, the carbonized layer of the fiber-woven fabric forms thermally conductive channels in both the warp and weft directions, and the composite thermally conductive filler forms a thermally conductive network within the matrix. Together, they construct a dual-network thermally conductive structure, giving the substrate excellent thermal conductivity, flexibility, and lightweight properties, making it suitable for high-power deployable spacecraft radiators.

The invention discloses a high-strength plant cellulose-based composite paperboard and a preparation method thereof, belongs to the technical field of paperboard materials, and aims to solve the technical problem that the strength and wet strength retention rate of a plant fiber-based composite paperboard in the prior art need to be further improved. The composite plant fiber layer is composed of a plant fiber layer and interface layers arranged on the two sides of the plant fiber layer in a modifying mode. A plant fiber layer is prepared through CMC modified plant cellulose, a PEG modified inorganic reinforcing agent and a bio-based toughening agent reinforced plant fiber, a composite structure of an interface layer, a fiber layer and an interface layer is formed by arranging a double-interface layer containing lignin nano particles / carboxylated nano cellulose, and a hot-pressing curing process is combined, so that the lignin / carboxylated nano cellulose composite fiber is prepared. The strength and toughness of the plant fiber-based composite paperboard are effectively improved, and the wet strength retention rate of the material is also effectively improved.

The utility model relates to the technical field of paper drying equipment, in particular to a paper drying device. Comprising a machine box and an air supply pipe, four temperature control areas are sequentially arranged in the machine box, the temperature control areas are arranged at intervals and form a backflow channel for airflow to pass through, surrounding walls are arranged outside the four temperature control areas, backflow layers are formed between the surrounding walls and the temperature control areas and communicated with the backflow channel, and the air supply pipe is communicated with the air supply pipe. Conveying rollers are symmetrically arranged on the two sides of the middle of the temperature control area, and air supply pipes are symmetrically arranged on the upper portion and the lower portion in the temperature control area respectively; the inside of the case is divided into a plurality of temperature areas, and a drying mode that the temperature rises step by step is adopted, so that the paper quality is improved, and the production efficiency is ensured.

The invention belongs to the technical field of titanium alloy preparation, and particularly relates to a TC25 titanium alloy bar with high thermal stability and a preparation method and application thereof. The titanium alloy bar comprises the following components in percentage by weight: 6.4%-6.8% of Al, 1.5%-2.5% of Mo, 2.0%-3.0% of Zr, 1.5%-2.5% of Sn, 0.5%-1.5% of W, 0.20%-0.30% of Si, 0.060%-0.090% of O and the balance of Ti and inevitable impurities, wherein the total amount of impurity elements does not exceed 0.2%; by reducing the content of two alpha-phase stable elements of Al and O, the precipitation tendency of an alpha2 phase in the forging process can be reduced, and the plasticity and toughness of the material are improved; the content of O is reduced, so that the embrittlement effect of the near surface layer of the bar is avoided, and the thermal stability of parts is effectively improved; and the contents of Zr, Sn and other elements with low electron concentration are properly increased, and the room-temperature and high-temperature strength is ensured.

The invention discloses a method for preparing a Ti-V-O titanium alloy part through a selective laser melting forming technology, and relates to the technical field of metal material preparation. The method aims at solving the problem that in the existing selective laser melting titanium alloy preparation process, the elongation is sensitive to oxygen elements. According to the method, micron TiO2 powder and spherical V powder are used and coated through a low-energy ball milling method, and then the coated powder is uniformly mixed with CP-Ti titanium alloy powder prepared through an argon atomization method to serve as a raw material for selective laser melting forming, so that the distribution uniformity of all elements in the powder is ensured. And melting and accumulating the powder layer by layer by virtue of selective laser melting equipment to finally obtain the selective laser melting titanium alloy block with excellent mechanical properties. The prepared selective laser melting titanium alloy does not need subsequent heat treatment, the elongation in the room-temperature mechanical property of the titanium alloy is improved along with the increase of the V content, and the common oxygen embrittlement problem of the titanium alloy is avoided. The method is used for preparing the titanium alloy.

The invention discloses a textile yarn constant-temperature humidifying and antistatic device, and relates to the field of textile industry, the textile yarn constant-temperature humidifying and antistatic device comprises a vehicle body, a heat exchanger is arranged on one side of the top of the vehicle body, a heat conduction fan is arranged on the other side of the top of the vehicle body, a base is arranged on one side of the vehicle body, and an auxiliary mechanism is arranged on the top of the base; according to the yarn constant-temperature humidifying and antistatic device for spinning, the heat exchanger, the heat conduction fan and a temperature sensor of the auxiliary mechanism are in linkage with a servo motor, the hot air introduction amount of a heat conduction notch is controlled by means of an air shielding plate, and the heat conduction notch is controlled by means of a temperature sensor of the auxiliary mechanism. The multi-stage fan blades are unfolded to retain hot air in the discharging barrel, accurate regulation and control over the temperature and humidity around a single batch of yarn are achieved, the problem of uneven temperature and humidity distribution of conventional equipment is solved, it is guaranteed that the water content of the yarn is stable, and embrittlement and breakage are avoided.

This invention relates to a seamless can having an inner surface coating at least on its inner surface side, and a coated metal sheet capable of being formed into such a seamless can. The seamless can is characterized in that the inner surface coating contains a polyester resin and a first-order phenolic resin and / or an amino resin as a curing agent, and the gel fraction (A) of the inner surface coating, as shown in the following formula, is 55% or more and less than 90%. This provides a seamless can with excellent resistance to boiling whitening, resistance to embrittlement over time, no coating peeling during heat treatment after forming, and excellent coating coverage, particularly for deep-drawn and thinned cans. Gel fraction (A) = (W2a / W1a) × 100 (%) where W1a represents the mass of the inner surface coating after separation from the coated metal substrate cut from the seamless can, and W2a represents the mass of the separated inner surface coating after immersion in MEK at room temperature for 60 minutes, followed by removal and drying.

The application discloses a low-heat-release, low-smoke-density flame-retardant polyamide material and a preparation method and application thereof, and belongs to the technical field of high polymer materials. The material comprises nylon resin 52-61%, a flame retardant 18-26%, a flame-retardant synergist 6-10%, a plasticizer 8-15%, a coupling agent 0.5-1.0%, an antioxidant 0.3-1.0% and a lubricant 0.3-1.0%, and is prepared through mixing, melt mixing, extrusion and granulation. The application effectively reduces the heat release and the smoke density of the polyamide material during combustion through the synergistic effect of the components such as the flame retardant, and meanwhile, good mechanical properties and processing stability are maintained, thereby meeting the demand of high-safety-grade application scenarios.

The utility model relates to bag making machine technical field especially relates to a kind of edge folding shaping device for clothes bag production of bag making machine, including operation platform, operation platform both sides are fixedly connected with equipment shell, and two groups of equipment shell are embedded with guiding component between the setting, two groups of sewing department and edge folding component are symmetrically set in the side of two groups of equipment shell, and two groups of sewing department and edge folding component are symmetrically set, two groups of edge folding component are embedded and set on operation platform upper end.This application is set through edge folding component, realize the automatic edge folding shaping function of cloth when bag making machine production clothes bag, and device can adapt to the cloth use of different thickness and width, device adopts secondary heating shaping mode, can preheat cloth, avoid high temperature to cause fibre brittleness, and pressurize in stage can fully soften fibre, through extruding plate can ensure that edge folding is attached, reduce rebound, reduce the possibility that cloth is loose when conveying edge folding.

The utility model relates to a kind of drying device for paper product processing, including drying cabinet, the traction mechanism that is set inside to the traction upper and lower material of kraft paper placed inside is provided to drying cabinet, and multiple mounting racks are alternately distributed on the two sides of kraft paper, and multiple electric heating tubes for improving the temperature inside drying cabinet are equidistantly provided to mounting rack, air inlet is opened to the air volume conveying inside it in one side of drying cabinet, and air volume is conveyed to the inside of drying cabinet by air inlet, so as to diffuse the heat gathered inside drying cabinet and wrap kraft paper, and then realize the drying of kraft paper two sides simultaneously.

This invention provides a copper-core aluminum-clad composite wire and its preparation method, belonging to the field of metal composite wire preparation technology. The invention constructs a composite alloy interface between the copper core and the aluminum cladding layer, synergistically reinforced by functionalized carbon nanotubes. An acid-treated carbon nanotube, nickel powder as the bonding agent, and selenium powder with refined grains are made into a slurry and coated onto the copper core. Then, hydrostatic extrusion achieves a tight composite with the aluminum tube. In subsequent drawing and annealing processes, high temperature drives the in-situ reaction of nickel and aluminum to generate intermetallic compounds, while the carbon nanotubes form a relatively stable bond with them, thereby improving interface strength and inhibiting cracking. Finally, a copper-core aluminum-clad composite wire with good interfacial bonding, mechanical properties, and electrical conductivity is obtained.

This application relates to the field of electrical materials technology, specifically disclosing an electrical graphene aluminum alloy rod and its preparation method; an electrical graphene aluminum alloy rod comprises the following raw materials in the following weight ratio: magnesium 0.3-0.5%, graphene 0.05-0.08%, silicon 1-3%, zinc 0.3-0.6%, tin 0.01-0.03%, chromium 0.005-0.008%, lanthanum 0.2-0.5%, boron 0.4-0.8%, toughening agent 1-3%, binder 0.5-0.8%, and the balance being aluminum; under the synergistic effect of each component, the overall strength of the aluminum alloy material can be effectively improved, while maintaining the good conductivity of the aluminum alloy material.

This invention discloses a low-temperature instant crosslinking rubber-type cold-resistant polyethylene protective film and its preparation method, belonging to the field of protective film technology. The protective film is prepared by coating a polyethylene base film with a two-component rubber pressure-sensitive adhesive and then crosslinking it at low temperature. Component A is a ternary compound rubber phase, and component B is an aliphatic triisocyanate crosslinking phase, combined with synergistic additives to achieve rapid low-temperature catalytic crosslinking. The preparation process employs a two-component synchronous delivery, static mixing, slot coating, and low-temperature curing at 70-90℃, completing crosslinking in 3-5 minutes, significantly reducing energy consumption. The resulting protective film exhibits excellent initial tack and holding power, shows no brittleness or residue at -30℃, has a gel content of over 91%, and demonstrates excellent low-temperature protective performance. This invention's process is safe, efficient, and suitable for industrial production, meeting the requirements for product surface protection in low-temperature environments.

This invention relates to the field of cable technology, specifically to a processing technology for high-temperature resistant, ultra-flexible motor lead wires. The process involves preparing two types of hexagonal boron nitride fillers with different surface properties through hydroxylation and silane modification, and applying them in separate layers of a three-layer insulating compound. Combined with a polysiloxane alkyl body with increasing phenyl content from the inside out, flexible single-end segments on the inner side, and a differentiated crosslinking agent / inhibitor system, the lead wire is obtained through three-layer co-extrusion and multi-stage temperature-increasing vulcanization. This process solves the problems of decreased flexibility, poor bending reliability, and easy failure of interlayer interfaces caused by high phenyl / high filler content in traditional methods, achieving a balance between high-temperature resistance, ultra-flexibility, and stable electrical performance.

According to the signal line with the protection function provided by the utility model, the sheath tube comprises the inner layer and the anti-ultraviolet layer, and the anti-ultraviolet layer is used for resisting ultraviolet rays, so that the sheath tube is prevented from being aged and embrittled under the condition of direct sunlight, and the service life of the sheath tube is prolonged; the adopted signal cable is provided with a first shielding signal layer and a second shielding signal layer, the shielding layers are grounded, external interference signals can be guided into the ground by the shielding layers, the interference signals are prevented from entering the signal line 21 to interfere, and meanwhile, the loss of transmission signals is reduced; the sheath pipe is manufactured through a blow molding process, the process is mature, and the superior product rate is high.

The utility model discloses an anti-brittle-fracture ceramic plunger which comprises a ceramic plunger body and a metal bushing. One end of the ceramic plunger body is fixedly sleeved with the metal bushing, and the hoop is clamped on the metal bushing, so that the hoop clamps the ceramic plunger body through the metal bushing. The utility model relates to the technical field of homogenizer equipment, and can solve the problem that a ceramic plunger in a homogenizer in the prior art is easy to crack after being clamped by a hoop.

The invention provides a sterilization device for non-woven fabric production and processing and a sterilization method thereof.The sterilization device is characterized by comprising a rack, a sterilization bin is fixedly connected to the rack, and a plurality of transparent partition plates are connected into the sterilization bin; a plurality of transparent partition plates are arranged in the sterilization bin body, the transparent partition plates are arranged in a straight line and divide an inner cavity of the sterilization bin body into a pre-sterilization chamber, a main sterilization chamber A, a main sterilization chamber B, a drying chamber and a cooling chamber in sequence, and a flexible brush is arranged in the middle of each partition plate; the sterilization device disclosed by the invention adopts a combined sterilization structure of pre-sterilization and main sterilization, the ultraviolet sterilization lamp performs primary sterilization on the surface of the non-woven fabric, and the plasma and low-temperature atomization main sterilization realizes deep sterilization on the surface of the non-woven fabric and fiber gaps, so that the sterilization strength is improved.

The invention discloses a TA11 titanium alloy bar with high creep resistance and high fatigue performance and a preparation method of the TA11 titanium alloy bar, and belongs to the field of titanium alloy material processing. 2, the blank is subjected to multi-heating-number circulating forging; step 3, rolling a finished bar; and 4, surface treatment. By optimizing the proportion of the alpha stable element, the beta stable element and the trace strengthening element and carrying out multi-heating-number forging and finished product rolling to refine the alloy structure within the range above and below the phase transformation point temperature, the high fatigue performance of the TA11 alloy bar is achieved, meanwhile, the trace silicon element is introduced, the dispersion strengthening effect of silicide is utilized, and the high fatigue resistance of the TA11 alloy bar is achieved. Dislocation motion and grain growth are hindered, the high creep resistance of the TA11 alloy is achieved, and the creep resistance and the fatigue resistance of the TA11 alloy bar are synergistically improved.

The invention relates to flame-retardant and high-temperature-resistant polyvinyl chloride and a preparation method thereof, and belongs to the technical field of polyvinyl chloride. The polyvinyl chloride comprises the following components in parts by weight: 100 parts of polyvinyl chloride resin, 12-25 parts of organic silicon-zinc hybrid flame retardant, 2-8 parts of reactive compatibilizer and 5-15 parts of core-shell functional filler. According to the organic silicon-zinc hybrid flame retardant, acrylic acid and aminopropyltrimethoxysilane are subjected to condensation to generate acrylamide silane, then the acrylamide silane is coordinated with zinc acetate to form a crystal structure, and silicon and zinc synergistic flame retardance is achieved; the core-shell functional filler takes zinc hydroxystannate as a core and zinc borate as a shell, and has smoke suppression and catalytic char formation functions; and the reactive compatibilizer is a copolymer containing an epoxy group, so that the interfacial compatibility of the flame retardant and the filler with PVC is improved, the safety performance of the material is improved, and the material is suitable for manufacturing cable sheaths.

This invention belongs to the technical field of welding materials and discloses a high-temperature resistant multi-element high-entropy alloy brazing filler metal and its preparation method. By mass fraction, it comprises the following components: Co 15%–25%, Ni 15%–25%, Cr 15%–25%, Fe 15%–25%, Cu 15%–25%, Mn 0.1–3%, Si 0.1–6%, B 0.1–5%, Sc 0.5–0.9%, and Y 0.1–1%. The preparation method of this invention is simple to operate, low in cost, highly efficient, and highly adaptable, showing great application potential. The high-entropy alloy brazing filler metal of this invention can be used in high-temperature, high-pressure, and corrosion-resistant environments after welding.