2196 results about "Brazing" patented technology

The invention provides a pre-buried brazing flux aluminum alloy brazing filler metal plate blank and a preparation method thereof, a pre-buried brazing flux composite aluminum alloy brazing plate strip and a preparation process and application thereof. After the mixed powder of the aluminum-silicon alloy and the brazing flux is pressed into the cylinder, the cylinder is extruded into the aluminum alloy brazing filler metal plate blank with the pre-embedded brazing flux through the semi-continuous extruding machine, the production efficiency is high, the yield is high, and the prepared aluminum alloy brazing filler metal plate blank with the pre-embedded brazing flux is uniform in component and good in extensibility. The prepared pre-buried brazing flux aluminum alloy brazing filler metal plate blank and an aluminum alloy core material are easy to roll and compound, the obtained pre-buried brazing flux composite aluminum alloy brazing plate strip has a good compound interface, does not have obvious defects such as slag inclusion, bubbles, layering and peeling, has the mechanical property meeting the requirements, has excellent ductility and good brazing performance, and is suitable for large-scale production. And the brazing effect with other aluminum components is good, the surface of a workpiece is bright, and soldering flux traces are not left. The technology can greatly simplify the manufacturing process of the aluminum heat exchanger, and can be used for large-scale industrial production.

The present disclosure relates to a method of using a metal specimen block having a porous region for a component. A method of coupling a metal sample block (200) to a component (202) may include additive manufacturing a metal sample block (200) having a first porous region (300A) having a first porosity and a second porous region (300B) having a second porosity different from the first porosity. A metal specimen block (200) is positioned in a specimen block opening (204) in a body (206) of the component (202). The metallic sample block (200) may be infiltrated with a braze material (310) to couple the metallic sample block (200) in a sample block opening (204) in the body (206). The one or more brazing materials (310) are infiltrated into at least one of the first porous region (300A) and the second porous region (300B) based at least on a characteristic of the first porosity and at least on a characteristic of the second porosity. The cured braze material (310) includes different segments having different physical properties based on different porosities and / or different braze materials.

A component (202) is disclosed that includes a body (206) and an additive manufactured (AM) metal mass (200) that includes a first section (292) and a stress relief section (294). The stress relief section (294) includes a porous region (300) having a porosity in which an open spatial volume accounts for 2% to 50% of the total volume of the stress relief section (294). The stress relief section (294) has a smaller at least one of thermal conductivity, tensile strength, ductility, and fatigue strength than the first section (292). A braze material (310) couples the AM metal specimen block (200) to a specimen block opening (204) in the body (206). The stress relief section (294) creates a low stress zone in the metal specimen block (200), which can be located near or adjacent to a high stress zone. The stress relief section (294) reduces residual stress in the metal sample block (200), which reduces related challenges to couple the metal sample block (200) to the body (206) of the component (202), particularly in the case of the use of superalloy materials.

To solve the problem of a conventional high pressure resistance response of a channel body, which has been addressed by expansion of a brazing area and substitution with a high strength material, the first is handled by expanding the brazing area, while there is a problem in the aspect of material costs and processing in the latter, in which a problem of standardization of the channel body cannot be solved since various channel bodies are provided for different applications, a sheet brazing material is frequently used for a brazing surface, and productivity is hindered by characteristics of the sheet brazing material.SOLUTION: A high pressure resistance response is handled by two kinds of means of free expansion of a brazing area and a structure optimal for brazing effectively utilizing a capillary phenomenon to a maximum. For standardization, various kinds of channels are formed by using an integrated channel body with which a high-strength channel plate made of a metal sheet is overlapped, thereby eliminating restrictions in the standardization or in the aspect of design of the channel body.SELECTED DRAWING: Figure 1, Figure 15

The invention discloses an electronic packaging heat dissipation substrate and a processing technology and application thereof. The electronic packaging heat dissipation substrate comprises a copper-clad diamond copper plate, a diamond sheet located on the copper-clad diamond copper plate and a first copper layer covering the diamond sheet. The copper-clad diamond copper plate comprises a diamond copper core material and a copper layer located on the surface of the diamond copper core material. The diamond copper core material and the copper layer form a composite board with a copper layer-core material-copper layer sandwich structure; and the copper-clad diamond copper plate, the diamond sheet and the first copper layer are connected into a whole through brazing. According to the electronic packaging heat dissipation substrate, the peeling and cracking risks can be reduced, and the problem of low heat transfer efficiency is solved.

The invention discloses active brazing filler metal for sealing sapphire and kovar alloy and a preparation method of the active brazing filler metal. The active brazing filler metal comprises 25.0 wt%-27.5 wt% of Cu, 1.0 wt%-6.0 wt% of Ti, 1.0 wt%-5.0 wt% of Al, 0.1 wt%-1.0 wt% of B, 0.1 wt%-0.5 wt% of rare earth element RE, RE is one or more of La, Ce, Sc, Pr, Nd and Er, and the balance is Ag. The preparation method comprises the following steps: preparing silver-based pre-alloying powder by adopting a gas atomization method, mixing the alloy powder with additive element powder in a ball milling manner, sintering by utilizing vacuum pressure to obtain an alloy ingot blank, and carrying out rough rolling, intermediate annealing and finish rolling to obtain an active brazing filler metal strip with the thickness of 0.05-0.2 mm. The active brazing filler metal is well matched with the thermal expansion coefficient of sapphire, direct brazing of sapphire and Kovar alloy can be achieved, the brazing temperature is moderate, and a brazed joint is uniform in structure and free of defects such as air holes and cracks.

The invention relates to the technical field of brazing equipment, and discloses brazing equipment and a welding process for semiconductor heating plate machining, the brazing equipment comprises a bottom plate, the top of the bottom plate is rotatably connected with a placing table, a heating plate workpiece is placed on the top of the placing table, and the top of the bottom plate is fixedly connected with a main body frame. Through the design of the welding mechanism, a heating disc workpiece is placed on the top of a placing table, then a welding gun body works and then cooperates with a brazing filler metal bar to execute a brazing task, in the period, the welding height can be adjusted by controlling a lifting block to ascend and descend, and a connecting plate can be controlled to swing with a rotating shaft as the axis; compared with hot isostatic pressing welding, the welding mode of the welding device avoids the situation that the non-welding part of the heating plate workpiece is deformed due to the fact that the temperature is too high, and then excessive manual participation is not needed in the welding process, so that the labor cost is greatly saved.

The precise welding control method for vacuum brazing comprises the steps that the geometrical shape and material characteristics of a workpiece are obtained, modeling processing is conducted in combination with the geometrical shape and the material characteristics, and a high-dimensional tensor and a high-dimensional time sequence are compared and calculated to obtain a deviation matrix; based on the deviation matrix, the brazing heating power and the brazing filler metal supply rate are adjusted, and a real-time control instruction set is generated; constructing a deep reinforcement learning model, performing iterative optimization on the real-time control instruction set based on the deep reinforcement learning model, extracting weld defect characteristics of the workpiece, generating a weld quality score according to the weld defect characteristics, and obtaining a difference value between the weld quality score and a set threshold value; and performing comprehensive optimization on the optimization parameter vector according to the difference value to generate a global optimization parameter set. According to the method, systematic dynamic control over complex geometrical shapes and multi-material workpieces is achieved, the defects of response lag and insufficient regulation and control are overcome, and therefore the process stability and production efficiency of vacuum brazing are greatly improved.

The invention relates to the technical field of circuit substrate manufacturing, and particularly discloses a preparation method of a composite solder sheet and an AMB ceramic copper-clad plate. The composite solder sheet is composed of an active metal foil and a copper-containing layer modified on the surface of the active metal foil, and the preparation method of the copper-clad plate comprises the following steps: after the surface of the active metal foil is pretreated, the copper-containing layer is deposited to prepare the composite solder sheet, and the composite solder sheet is placed between a copper substrate and a ceramic sheet to be pressed and assembled. And performing vacuum brazing on the assembly to complete the preparation of the ceramic copper-clad plate. A composite solder sheet containing active metal is adopted, high-temperature element diffusion during vacuum brazing is utilized at the diffusion temperature to achieve alloying of a composite solder layer, and then heat preservation is conducted at the brazing temperature to achieve uniform melting of solder and wetting metallurgical reaction between the solder and copper and between the solder and a ceramic substrate. By means of the preparation method, low-cost and high-reliability preparation of the AMB ceramic copper-clad plate can be achieved, and the prepared AMB ceramic copper-clad plate also has high peel strength and lower weld porosity.

The invention discloses an Ag-Cu-Ti-Zr-B active composite brazing filler metal and a preparation method of the Ag-Cu-Ti-Zr-B active composite brazing filler metal. The active composite brazing filler metal is composed of, by mass, 5%-8% of Ti, 2%-5% of Zr, 0.1%-2% of B and the balance Ag-28Cu eutectic components. The Ag-Cu-Ti-Zr-B active composite brazing filler metal prepared through the method has the advantages that the wettability is improved, the interface bonding strength is enhanced, the joint structure is refined, the brazing temperature is reduced, the fluidity and permeability are improved, and the heat resistance and corrosion resistance are improved. Due to the characteristics, the brazing filler metal becomes excellent brazing filler metal in ceramic metal brazing, and is particularly suitable for connection of high-performance ceramic and metal.

A high-performance near-pure zinc alloy, a preparation method therefor and a use thereof, relating to the technical field of zinc alloys. The alloy component is that the content of Zn is greater than or equal to 99.5%, and the remaining trace alloy elements include at least two of the following 14 elements: Mg, Mn, Li, Cu, Ag, Ca, Sr, Fe, Zr, Ti, Al, C, Ga, and Si. The alloy has the yield strength ≥ 250 MPa, the tensile strength ≥ 320 MPa, the elongation ≥ 25%, the mechanical property change during one year of room-temperature storage ≤ 5%, the maximum bending force ≥ 2 kN, the stress corrosion sensitivity factor ≤ 15%, the size of corrosion pits after 60 days of immersion ≤ 15 μm, and the standard deviation of the size of corrosion pits ≤ 3 μm. The alloy is suitable for the preparation of biodegradable stents, bone implant devices, medical staplers or anastomotic nails for intestines, blood vessels or nerves, vascular clamps, guided bone or tissue regeneration membranes, heart valve protheses, dura mater repair membranes, soluble bridge plugs and fracturing balls for oil drilling, zinc alloy die castings, electroplated zinc materials, building zinc materials, battery-grade zinc, printing-grade zinc, and zinc-based brazing alloys.

An active metal brazing substrate material and a method for producing the same are provided. The active metal brazing substrate material includes a ceramic substrate layer, a first brazing layer, a second brazing layer, and a conductive metal layer that are sequentially stacked. The first brazing layer includes a first metal composite material, which includes silver (Ag), copper (Cu), and a first active metal element. Based on a total weight of the first metal composite material being 100 parts by weight, a silver content is not less than 50 parts by weight. The second brazing layer includes a second metal composite material, which includes aluminum (Al), copper (Cu), and a second active metal element, but does not contain silver. Based on a total weight of the second metal composite material being 100 parts by weight, an aluminum content is not less than 40 parts by weight.

The invention discloses coating type preformed brazing filler metal and a preparation method and application thereof, and belongs to the technical field of brazing, the coating type preformed brazing filler metal comprises brazing filler metal and brazing flux wrapping the periphery of the brazing filler metal, the brazing filler metal comprises aluminum-silicon alloy, and the brazing flux comprises fluoroaluminate; the mass ratio of the aluminum-silicon alloy to the fluoroaluminate is (75-96): (4-25). According to the method, the outer surface of the aluminum-silicon alloy is coated with the fluoroaluminate, the brazing flux can effectively remove an oxidation film on the surface of brazing filler metal and an oxidation film on a welding interface, the welding quality is improved, and then the product yield is improved.

The invention discloses vacuum brazing equipment and method for a plate-fin heat exchanger, relates to the field of welding, and aims to solve the problems of low heating efficiency and difficulty in deformation control caused by structural characteristics of the plate-fin heat exchanger and characteristics of vacuum radiation heating at present. Structures such as a hydraulic control system, an upper water-cooling sealing conductive pressure head, a lower conductive base and a tool are added on the basis of traditional vacuum brazing equipment, the structures are compounded with a furnace pipe, an upper electrode of the upper water-cooling sealing conductive pressure head is of a distributed structure and can move up and down through the hydraulic control system, and the upper electrode of the lower water-cooling sealing conductive pressure head can move up and down through the tool. And by matching with a tool, a workpiece can be always stressed uniformly, and continuous and stable self-resistance extremely-fast heat generation electrifying can be ensured. Double-feedback series control is adopted to achieve double-heat-source heating, the heating process time is shortened, a pressure-temperature coupling control method is adopted, it is ensured that stress is uniform, deformation is reduced, and the heating efficiency and the welding quality consistency are improved. And rapid and uniform heating and small deformation control of the workpiece can be realized.

The invention discloses automobile radiator brazing quality detection equipment, which belongs to the technical field of automobile radiator brazing detection and comprises a detection table, a welding test mechanism is arranged on the detection table and used for simulating the detection environment of an automobile radiator, and an overall detection unit is further arranged on the detection table. The method is used for detecting the welding integrity of the heat dissipation belt and the coverage rate of a brazing surface. According to the invention, the detection table carrying the infrared correlation detector is matched with the detection rod, so that whether the infrared receiving end can normally receive an infrared signal transmitted by the infrared transmitting end when the heat dissipation belt is vertically lifted after brazing can be known, and the infrared signal can be used as a detection standard of the brazing quality of the heat dissipation belt, so that whether the brazing position is not firm in welding or not can be known. According to the method, the situation that the brazing part is broken is avoided, the efficient detection effect is achieved, the rough unqualified welding part of the heat dissipation belt can be known according to the setting part of the infrared receiving end which cannot receive the infrared signal, and the troubleshooting time of quality inspection personnel is shortened.

Provided is a brazing sheet exhibiting excellent brazing properties where an aluminum material is brazed in an inert gas atmosphere such as a nitrogen gas atmosphere without using a flux. The aluminum alloy brazing sheet used for brazing in an inert gas atmosphere without using a flux, the aluminum alloy brazing sheet comprises: a core material; and a brazing material cladded on one side surface or both side surfaces of the core material, in which the core material is formed of aluminum or an aluminum alloy, the brazing material comprises 4.00 mass % to 13.00 mass % of Si and comprises 0.10 mass % to 2.00 mass % of Mg, with the balance being Al and inevitable impurities, and an integral value of Mg from a surface of the brazing material to a depth of 60 nm is 30 at %×nm to 600 at %×nm.

The invention provides multi-element alloy silver-free copper-based brazing filler metal and a preparation method thereof.The brazing filler metal comprises, by mass, 30%-40% of zinc, 4%-11% of manganese, 1%-4% of tin, 0.2%-0.6% of silicon, 0.2%-1% of rare earth elements and the balance copper, the rare earth elements comprise cerium, praseodymium and rhenium, and the mass ratio of cerium to praseodymium to rhenium is (0.8-1.2): (0.8-1.2): (0.6-1.0). According to the multi-element alloy silver-free copper-based brazing filler metal, the performance of a brazed joint is improved, the strength, toughness, fatigue resistance and the like of the joint are improved, and the reliability and stability of connection under various working conditions are ensured.

The invention discloses a niobium-zirconium alloy and nickel-based alloy vacuum brazing process and a part, and belongs to the technical field of vacuum brazing. According to the process, a vacuum brazing furnace is adopted for brazing, and BNi-2 brazing filler metal is used; the process comprises the following steps that S1, a welding assembly structure formed by a niobium-zirconium alloy part and a nickel-based alloy part is assembled, and BNi-2 brazing filler metal is arranged at the matching position of the welding assembly structure; s2, staged heating is carried out on the welding assembly structure under the preset vacuum degree of the vacuum brazing furnace, and the staged heating comprises a foreign matter removing heating stage, a brazing filler metal solid diffusion heating stage and a brazing filler metal melting wetting heating stage which are sequentially carried out; and S3, staged cooling is conducted on the welded assembly structure after welding is completed, the staged cooling comprises a furnace cooling stage and a gas quenching cooling stage which are conducted in sequence, according to the scheme, defect control over the niobium-zirconium alloy and nickel-based alloy welding joint can be effectively achieved, and the strength and sealing performance of the welding joint are guaranteed.

The invention relates to the technical field of brazing, in particular to a brazing production line for radiator fin machining and a welding process thereof.The brazing production line comprises a plasma spot welding module and a brazing furnace, and brazing flux spraying equipment and drying equipment are sequentially arranged between the plasma spot welding module and the brazing furnace; a production line conveying belt is arranged in the plasma spot welding module, the brazing flux spraying device, the drying device and the brazing furnace and used for conveying radiator fins. The brazing filler metal in the radiator fins is melted in the welding bin, then the radiator fins are driven to vibrate in the promoting bin, and therefore when the liquid brazing filler metal flows into base metal gaps, the constraint of surface tension can be broken through moderate vibration.

The invention relates to the technical field of brazing processes, in particular to a brazing process for connecting aluminum oxide ceramic and metallic titanium through low-activation brazing filler metal. According to the technical scheme, the method comprises the following steps that a to-be-welded face of the aluminum oxide ceramic is subjected to magnetron sputtering titanium film plating, the sputtering power ranges from 80 W to 150 W, the argon pressure ranges from 0.5 Pa to 1.5 Pa, the film thickness ranges from 0.5 micrometer to 5 micrometers, inert gas annealing treatment is conducted after film plating, the annealing temperature ranges from 400 DEG C to 550 DEG C, and the heat preservation time ranges from 10 min to 30 min; and the surface of the metal titanium substrate is subjected to laser micro-texture treatment, and a periodic groove structure with the depth being 10-50 microns is formed. The problems of poor wettability of the brazing filler metal and the ceramic, low joint strength and joint stress cracks are solved, meanwhile, radioactive substances generated by the brazing filler metal under the irradiation condition can be released within a short time, the equipment maintenance period is greatly shortened, and the equipment service life is prolonged.

The invention discloses a method for patching and repairing a silicon carbide ceramic matrix composite part of an aero-engine, which comprises the following steps: using a CMC-SiC patch as a structure for patching and repairing part cracks, corrosion pits or fiber cracks, preparing surface textures on the contact surface of the CMC-SiC patch and the part by using pulse laser, coating brazing filler metal on the contact surface of the CMC-SiC patch and the part, and preparing the surface textures on the contact surface of the CMC-SiC patch and the part. And the CMC-SiC patch and the surface of the part are pressed tightly, and patching and repairing of the silicon carbide ceramic matrix composite part of the aero-engine are completed after vacuum brazing, polishing, cleaning and drying, environmental barrier coating recovery and annealing. According to the repairing method, a patching technology is adopted, a force transmission path at cracks, corrosion pits or fiber fractures is rebuilt, the strength of the part is recovered, and the repairing problem of relatively serious damage such as relatively wide cracks, corrosion pits or fiber fractures on the silicon carbide ceramic-based composite part is solved. In addition, specific textures and shapes are prepared on the binding face of the CMC-SiC patch and the part through pulse laser, and the optimal combination effect and joint strength of the brazing filler metal, the patch and part base metal are accurately achieved.

The utility model relates to the technical field of inflatable hoses, in particular to a high-performance wear-resistant extremely-cold-resistant inflatable hose. The inflation hose comprises a metal corrugated pipe, the metal corrugated pipe is sleeved with a steel wire mesh sleeve, the steel wire mesh sleeve is sleeved with a long connecting pipe, the long connecting pipe is sleeved with a vulcanization layer, one end of the metal corrugated pipe is connected with a long inner cone connecting nozzle in an inserted mode, and the outer surface of the long inner cone connecting nozzle is sleeved with a nut in a threaded mode. And a long outer cone connecting nozzle is inserted into the other end of the steel wire mesh sleeve. The inflatable hose can meet the requirement of a dew point of-65 DEG C by adopting a metal corrugated pipe structure, can meet the requirements of 40MPa working pressure and 120MPa bursting pressure structure by adopting a steel wire mesh sleeve structure and adopting a high-pressure brazing form after double-layer weaving, and meanwhile, the vulcanization layer is arranged outside the long connecting pipe in a sleeving manner, so that the service life of the long connecting pipe is prolonged. Therefore, the inflatable hose has excellent oxidation resistance, ozone resistance and erosion resistance.

The invention provides a laser-induced composite material surface multi-scale micro-texture assisted brazing method which comprises the following steps: step 3, carrying out surface texturing treatment on a to-be-welded surface of a fiber reinforced ceramic matrix composite obtained in step 2 by using a laser in air, and in the laser texturing process, carrying out surface texturing treatment on the to-be-welded surface of the fiber reinforced ceramic matrix composite, the fiber-reinforced ceramic matrix composite material is placed in the center of a laser objective table, then laser with the defocusing amount being-5-5 mm, the laser power being 0-300 W and the laser scanning speed being 5-100 mm s <-1 > is adopted for vertical irradiation, and the textured fiber-reinforced ceramic matrix composite material is obtained; and fourthly, active brazing filler metal is placed between the textured fiber-reinforced ceramic matrix composite obtained in the third step and the to-be-welded face of metal, and brazing assembly is completed. According to the method, the original straight interface reaction layer is textured through a surface material reduction method, and compared with a surface material increase method which is complex in process, harsh in process condition and high in process cost, the economic cost and the labor cost of the process are greatly reduced through the method.

The invention discloses a Zn-Al series brazing material for aluminum-copper welding and a preparation method and application of the Zn-Al series brazing material, and belongs to the technical field of brazing materials. The brazing material comprises the following chemical components in percentage by weight: 9%-25% of Al, 1%-5% of Ag, 1%-4% of Cu, 1%-4.5% of Si, 0.003%-1% of Mg, 0.05%-1% of Sr, 0.05%-1% of Ti, 0.05%-1.5% of Ni, 0.02%-0.15% of Sc and the balance of Zn. The Zn-Al series brazing material is used for brazing welding of Al and Cu, and a welded joint with high shear strength and high corrosion resistance can be obtained. The preparation method comprises the steps that raw materials prepared according to the preset chemical composition of the brazing material are subjected to vacuum melting and pouring, and an alloy ingot is obtained; and the alloy cast ingot is subjected to double-roller rapid solidification. The method is simple, easy to operate and suitable for industrial production.

The invention provides a preparation method of an Al-Mg-Mn-Sc series aluminum alloy plate. The preparation method comprises the following steps: S1, carrying out hot rolling on an Al-Mg-Mn-Sc series aluminum alloy cast ingot; s2, the hot-rolled aluminum alloy plate is pre-annealed and then cold-rolled for the first time; s3, carrying out intermediate annealing on the cold-rolled aluminum alloy plate, and then carrying out secondary cold rolling; and S4, the aluminum alloy plate obtained in the step S3 is subjected to air cushion furnace rapid annealing. The invention further provides application of the aluminum alloy plate prepared through the method. According to the preparation method of the Al-Mg-Mn-Sc series aluminum alloy plate, through accurate component regulation and control and process optimization, the strength of the aluminum alloy plate is improved, and the mechanical property of the aluminum alloy plate is not obviously reduced under the 280 DEG C brazing machining condition.

The invention discloses a brazing method for improving the welding strength of a polycrystalline diamond cutter and a hard alloy. The brazing method comprises the following steps that S1, brazing filler metal alloying is conducted; and S2, the PCD tool bit and the hard alloy matrix are subjected to vacuum brazing. According to the brazing filler metal, an Ag-Cu-Co system is adopted, Ag mainly plays a role of a solder matrix and provides plasticity and thermal conductivity, Cu mainly plays a role of forming an eutectic structure with Ag and reducing the melting point, and Co mainly plays a role of wetting the surfaces of PCD and hard alloy. Co infiltration is adopted in the preparation process of the PCD tool bit used in the method, so that a certain amount of Co exists on the PCD surface, and the hard alloy tool body also contains Co, and therefore, a small amount of Co in the brazing filler metal can better wet the welding surface according to the similar intermiscible principle. In the vacuum brazing process, additional pressure does not need to be applied, when the brazing filler metal is molten, the brazing filler metal is evenly laid on the welding face under the action of the pressure of the PCD tool bit on the upper portion and the capillary effect, the redundant brazing filler metal can flow out of the two sides of the mold, and the flatness of the welding surface can be effectively guaranteed.

The invention relates to the technical field of brazing, in particular to a metal wetting behavior regulation and control system and method in the vacuum brazing process. The pretreated hard alloy, the pretreated base body and the pretreated mixed brazing filler metal are loaded into a vacuum brazing furnace, a heating and temperature control system is started, and heating is conducted according to a preset heating curve; in the heating process, according to a feedback result monitored in real time, the wetting behavior of the brazing filler metal is regulated and controlled; and the heating system is closed, so that the brazed part is naturally cooled in the vacuum environment. The hard alloy and the substrate are subjected to surface pretreatment, so that surface oxides, oil stains and other impurities are effectively removed, the wettability of the surface of the substrate is improved, and favorable conditions are provided for uniform wetting of the brazing filler metal. And a proper amount of active elements are added into the prepared mixed brazing filler metal, so that the wettability of the brazing filler metal on the hard alloy is improved. Therefore, the problem that metal wetting is not uniform in the traditional vacuum brazing process is solved.

The invention relates to the technical field of brazing, discloses a sapphire light window and metal packaging brazing device and method, and solves the problems that the acting force among a metal cavity, a sapphire light window and a welding flux is inconvenient to adjust according to actual requirements, and the application range is relatively small, the sapphire light window and metal packaging brazing device comprises a supporting box, and a plurality of pressing discs are arranged above the supporting box; a supporting seat is arranged below the pressing disc, the supporting seat and the supporting box are fixedly connected through a plurality of supporting columns, a containing groove matched with the pressing disc is formed in the top of the supporting seat, a first through hole is formed in the inner wall of the bottom of the containing groove, and a first rotating shaft rotationally connected penetrates through the supporting box; according to actual requirements, the pressing force of the pressing disc can be adjusted through the damping pressing adjusting assembly, then the acting force among the metal cavity, the sapphire light window and the welding flux is controlled through the pressing disc, packaging brazing can be conducted on multiple sets of sapphire light windows and metal, the application range is widened, and the brazing efficiency is improved.

The invention discloses a method for improving the strength and long-term service performance of a brazed joint in a skutterudite thermoelectric device by using a cobalt-based barrier layer, and belongs to the technical field of thermoelectric material connection. The problems that the long-term service performance of existing skutterudite and electrode brazing is poor, and the strength of a brazed joint is low are solved. The cobalt-based barrier layer added between the skutterudite and the electrode is cobalt and the refractory metal, and the refractory metal is high in melting point, bond energy and diffusion activation energy, so that diffusion of the Sb element through the barrier layer to the electrode is inhibited, and the components of the cobalt-based barrier layer can be flexibly adjusted, so that the thermal expansion coefficient of the barrier layer is easily matched with that of the skutterudite. The barrier layer powder and the skutterudite powder are subjected to integrated hot pressed sintering, and staggered interfaces are formed between the powder and the powder; and the interface stress can be well relieved. Due to the fact that the barrier layer contains fewer grain boundaries, diffusion of the Sb element can be better restrained. The shearing strength of the obtained brazed joint of skutterudite and the electrode reaches 33.6 MPa.

The invention provides a hybrid welding method. The hybrid welding method comprises the following steps that the surfaces of a first to-be-welded part and a second to-be-welded part are cleaned; the welding interface of the first to-be-welded part and the second to-be-welded part is coated with a brazing material, and the first to-be-welded part and the second to-be-welded part are clamped to form a to-be-welded assembly; the to-be-welded assembly is fed into a vacuum brazing furnace to be brazed, a brazing material is cooled and solidified to form a brazing layer after being heated and melted, the brazing layer is connected with the first to-be-welded part and the second to-be-welded part, and a brazed welding part is obtained; and the brazing welding part is taken out of the vacuum brazing furnace, laser is focused on a brazing layer of the brazing welding part, the laser conducts scanning welding according to a preset track, and a welding part is obtained. The method can reduce the requirement of the component on the surface machining precision of the to-be-welded part and the requirement on the assembly process precision, can simplify the process, reduces the production cost, and improves the production efficiency.