1162 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 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.

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.

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 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 discloses a pneumatic capillary copper pipe expanding machine and a pipe expanding method, and relates to the technical field of pipe expanding equipment, and the pneumatic capillary copper pipe expanding machine comprises a rack, a clamping conveying device and a pipe expanding male die device. The clamping and conveying device comprises a conveying air cylinder and a clamping mechanism, and the clamping mechanism is provided with a pipe penetrating channel to clamp the capillary copper pipe. The pipe expanding male die device comprises a pipe expanding fixing plate, a rotary disc, a rotary air cylinder, a plurality of pipe expanding mechanisms and a discharging pipe. The discharging pipe or one pipe expanding mechanism is coaxial with the pipe penetrating channel. The pipe expanding mechanism comprises pipe expanding needles fixedly arranged on the rotary disc, the diameters of the pipe expanding needles are sequentially increased in the rotating direction, and pipe expanding guide assemblies are arranged on the outer sides of the pipe expanding needles and are driven by a push-pull air cylinder to do axial reciprocating motion. The end of the capillary copper pipe can be directly expanded, a transition pipe is omitted, and brazing spots are reduced, so that the cost is reduced, pipe blockage and fluorine leakage are prevented, and the product quality is improved. The invention further discloses a pneumatic capillary copper pipe expanding method.

The invention provides municipal water supply pipeline welding equipment, and relates to the technical field of welding, the municipal water supply pipeline welding equipment comprises an upper clamping ring and a lower clamping ring, the upper clamping ring and the lower clamping ring define a circular ring, supporting semi-rings are fixed to the two upper clamping rings and the two lower clamping rings respectively, and a connecting plate is fixedly connected between the left supporting semi-ring and the right supporting semi-ring; telescopic moving wheels are arranged on the supporting semi-rings respectively, a supporting frame is connected between the two telescopic moving wheels, an extrusion wheel is connected to the supporting frame, an air bin is arranged on the supporting frame and arranged on the side, away from the extrusion wheel, of the welding head mechanism, the lower portion of the air bin is attached to the surface of the water pipe, and an air suction heating mechanism is arranged in the air bin and is in transmission connection with the telescopic moving wheels. An inclined plate is fixedly connected into the air bin, hot air is absorbed into the air bin, the solidification speed of a brazing rod solution is slowed down, the flowing speed of the brazing rod solution to a V-shaped groove welding seam is increased, the brazing rod solution is pushed to the V-shaped groove welding seam by arranging the inclined plate, and then the brazing rod solution is rolled by arranging an arc-shaped pressing roller.

The invention belongs to the technical field of brazing materials, and particularly relates to micro-nano particle reinforced nickel-based ultralow-melting-point wear-resistant brazing filler metal and a preparation method and application thereof. The invention provides micro-nano particle reinforced nickel-based ultralow-melting-point wear-resistant brazing filler metal. The micro-nano particle reinforced nickel-based ultralow-melting-point wear-resistant brazing filler metal comprises 94-99 parts of ultralow-melting-point nickel-based brazing filler metal and 1-6 parts of micro-nano particles. The ultralow-melting-point nickel-based brazing filler metal contains B, Si, In, Sn and Cu elements at the same time, and the melting temperature of the brazing filler metal can be cooperatively reduced; and meanwhile, the micro-nano particles are added, so that the strengthening and abrasion increasing effects on the nickel-based brazing filler metal can be effectively guaranteed, and meanwhile the flowability of the brazing filler metal is not affected. Therefore, through component design of the nickel-based brazing filler metal and synergistic cooperation of the micro-nano particles, the melting point of the brazing filler metal can be remarkably reduced, the brazing filler metal can be endowed with excellent hardness and wear resistance, and the technical bottlenecks that traditional nickel-based brazing filler metal is high in melting temperature and poor in wear resistance and brazed diamond is subjected to thermal damage are solved; and the method has a wide application prospect in brazing of diamond tools.

A method for joining, by brazing, a first part and a second part, the steps of preparing at least one of the parts including the following: a) providing a part intended to be brazed, the part being made of carbon or based on titanium, nickel or a CoCr alloy, b) performing inert gas plasma treatment on the part whereby the part is cleaned and an active surface is formed on the part, c) depositing a first layer comprising an active element on the active surface of the part, the active element being a carbide-forming element, d) depositing a second layer of gold on the first layer, whereby the first layer is protected from oxidation and good wetting is ensured.

Described herein is an aluminium alloy multi-layered brazing sheet product for brazing in an inert-gas atmosphere without a flux that includes a core layer made of a 3xxx alloy that includes <0.2 wt. % Mg, and that provides a covering clad layer that includes 2-6 wt. % Si on one or both sides of said 3xxx alloy core layer and a Al—Si brazing clad layer that includes 7-13 wt. % Si positioned between the 3xxx alloy core layer and the covering clad layer, wherein the covering clad layer has a thickness X1 and the Al—Si brazing clad layer has a thickness X2 and wherein X2≥2X1. Also described herein is the use of an aluminium alloy multi-layered brazing sheet product in a flux-free controlled atmosphere brazing (CAB) operation to produce a heat exchanger apparatus.

The invention discloses a heat dissipation substrate and a preparation method and application thereof, and belongs to the technical field of heat dissipation plates. The heat dissipation substrate comprises a first copper layer, a first brazing layer, a first TiC layer, a diamond sheet layer, a second TiC layer, a second brazing layer and a second copper layer which are sequentially arranged in a stacked mode. And a groove for placing a chip is formed in the surface of one side, far away from the diamond sheet layer, of the first copper layer. The heat dissipation substrate is good in heat conductivity, high in heat dissipation efficiency, small in thermal stress between the layers and good in binding force. The preparation method is simple in process, controllable in cost and suitable for industrial production. The vehicle-mounted SiC chip packaging heat dissipation plate comprising the heat dissipation substrate can efficiently dissipate heat under the working conditions of high heat flux, high temperature, high pressure and high frequency, and can effectively prevent the chip from beforehand failure caused by thermal stress and thermal fatigue, thereby ensuring higher reliability and longer service life; and the requirements of high-power and high-current-density new energy automobiles can be met.

The invention discloses a dry pattern transfer method for an AMB copper-clad ceramic substrate in the technical field of ceramic substrate sintering, and the method comprises the following steps: S1, manufacturing a positioning hole, and forming a process reference; s2, prefabricating a circuit pattern through a stamping process; s3, brazing material layers are printed on the two faces of the ceramic substrate; S4, the copper layer pattern and the ceramic substrate are assembled in an aligned mode; s5, carrying out high-temperature sintering on the copper layer and the ceramic substrate, and carrying out metallurgical bonding; and S6, the sintered substrate is subjected to cleaning, surface treatment and laser precision cutting. According to the method, laser positioning and micron-sized reaming are adopted, an accurate alignment reference is established, mechanical assembly errors are fundamentally eliminated, a copper circuit directly forms a preset pattern on a substrate through cooperation of a copper block pre-forming structure and an accurate brazing process, the lateral corrosion problem of a traditional etching process is avoided, and the production efficiency is improved. The size error of the product graph is reduced, and the product graph accuracy and the machine graph size consistency are improved.

The invention relates to the technical field of high-power femtosecond laser manufacturing, and discloses a high-power industrial femtosecond laser water cooling structure and a manufacturing method thereof. Comprising the steps that any one of a variable cross-section spiral flow channel, a bionic fin flow channel or a micro-channel array is directly machined in a machine shell water-cooling plate through the five-axis linkage precision machining technology or the micro-nano machining technology, or the printer shell water-cooling plate is integrated through the metal additive manufacturing technology; a reflector base, a heat dissipation chute and a cooling water channel are integrated in the machining process of the water cooling plate of the machine shell; carrying out material and surface treatment process operation; assembling process operation is carried out, a reflecting mirror base is matched with a mortise and tenon joint structure and a machine shell water-cooling plate through high-precision positioning pins, the reflecting mirror base and the machine shell water-cooling plate are rigidly connected in a vacuum brazing or laser welding mode, and a light guide side plate and a runner cover plate are designed into standard modules; the light guide side plate and the runner cover plate are quickly assembled through magnetic attraction positioning and spring buckles.

The invention belongs to the technical field of micro-focus X-ray tubes, and particularly relates to a method for improving the coaxiality of brazing electrodes and application. The method for improving the coaxiality of the brazing electrodes comprises the steps that a clamp is used for clamping the first electrode and the second electrode, coaxial brazing holes are formed in the two ends of the first electrode and the two ends of the second electrode, ceramic rods and welding flux are put into the brazing holes, and an assembly is obtained; the assembly is subjected to vacuum brazing, and the first electrode, the second electrode and the ceramic rod are connected into a whole through welding flux melting; after vacuum brazing, coaxial small holes are formed in the middle of the first electrode and the middle of the second electrode respectively. The method for improving the coaxiality of the brazing electrode is applied to preparation of an electrostatic lens, and the electrostatic lens is applied to a micro-focus X-ray tube. According to the method, vacuum brazing is conducted firstly, then trepanning is conducted, the product structural strength is guaranteed, meanwhile, the coaxiality of small holes of the electrostatic lens is met, and the method can be well applied to a micro-focus X-ray tube with a compact space.

The invention relates to the technical field of vacuum brazing, and discloses a vacuum brazing method for a needle array radiator, which comprises the following steps of: fusing reference process parameters of a historical process knowledge base and multi-dimensional characteristic parameters of the needle array radiator to obtain brazing process characteristic parameters; performing process strategy matching on the needle array radiator to confirm a vacuum brazing strategy of the needle array radiator; a vacuum brazing strategy is applied, and a vacuum brazing furnace is driven to execute stage process operation of preheating degassing, brazing filler metal melting and spreading, diffusion bonding and controllable cooling; performing situation analysis on the real-time process data flow of the stage process operation to obtain deviation data; dynamic parameter reconstruction is conducted on the target brazing stage of the needle array radiator, and temperature regulation and control parameters and process logic parameters are obtained; the needle array radiator is subjected to circulating brazing control, and a post-welding component of the needle array radiator is obtained; the efficiency of the vacuum brazing method for the needle array radiator can be improved.

The invention discloses a brazing tool and method for a plate-fin radiator. Comprising a lower stainless steel foil (2), a lower temperature measuring plate (3), a lower stainless steel plate (4), a lower process aluminum plate (5) and a lower perforated plate (6) which are sequentially laid on the bottom face of a radiator (1) to be brazed, and an upper stainless steel foil (7), an upper temperature measuring plate (8), an upper stainless steel plate (9), an upper process aluminum plate (10) and an upper perforated plate (11) which are sequentially laid on the top face of the radiator (1) to be brazed. And more than one through hole (12) is distributed on each of the upper perforated plate and the lower perforated plate. The problem that the heat capacity of a brazing tool, the brazing gap and the pressing force of the tool are in contradictory relation is fundamentally solved.

The invention discloses a material with a silver coating for low-temperature brazing of brazing filler metal, and particularly relates to the field of brazing welding, which comprises the following steps: silver amalgam paste is prepared by oscillating and mixing silver powder and mercury according to the mass ratio of 1: 9-0.5: 9.5 in a manner and method for plating silver on the surface of base metal (metal, semiconductor, ceramic or glass); when brazing is carried out, the surface of the silver plating layer of the to-be-welded piece is coated with brazing filler metal, and then heating and pressurizing are carried out in a low-temperature interval of 120-350 DEG C in a vacuum, protective atmosphere or atmospheric environment to complete connection. According to the method, the amalgam reaction and isothermal solidification principles are utilized, a tough welding spot mainly comprising a silver-based solid solution is finally formed, generation of a large number of brittle intermetallic compounds is avoided, a connector has high strength, high reliability and excellent thermal fatigue resistance, and therefore the problems that gold-tin brazing filler metal is high in cost, the brittleness of the welding spot is large, and the welding temperature is high are successfully solved.

The invention provides a preparation method of a micro-channel pipe structural member for a liquid cooling plate, and belongs to the technical field of liquid cooling plates. The invention discloses a preparation method of a micro-channel pipe structural member for a liquid cooling plate. The preparation method comprises the following steps: S1, preparing raw materials for forming the liquid cooling plate; s2, carrying out roll bending forming treatment on the upper wallboard raw material; s3, roll bending forming treatment is conducted on the lower wall plate raw material; s4, the micro-channel pipe raw material is subjected to roll bending forming treatment; s5, the upper wall plate structural part, the lower wall plate structural part and the micro-channel pipe structural part which are subjected to roll bending forming treatment are connected and fixed through brazing, and a final three-layer structural part is assembled; and S6, a cooling water nozzle is installed at the position of the micro-channel pipe structural part. According to the method, roll bending is conducted firstly, then welding is conducted, the method has the advantages of being efficient and rapid in forming, integrated forming can be achieved on complex profiles through the process, high-temperature diffusion bonding is avoided, and therefore the service life of the three-layer plate is greatly prolonged, and the mechanical property of formed components is greatly improved.

The present application relates to high speed, high efficiency SiC power modules. A power converter module includes an active metal brazing (AMB) substrate, a power converter circuit, and an enclosure. The AMB substrate includes an aluminum nitride base layer, a first conductive layer on a first surface of the aluminum nitride base layer, and a second conductive layer on a second surface of the aluminum nitride base layer opposite the first surface. The power converter circuit includes a plurality of silicon carbide switching components coupled to each other via the first conductive layer. The enclosure is disposed over the power converter circuit and the AMB substrate. By using an AMB substrate with an aluminum nitride base layer, thermal dissipation of the power converter module can be significantly improved while maintaining structural integrity of the power converter module.

The invention belongs to the technical field of graphite metal composite heat dissipation devices, and provides a flexible graphene film heat conduction cable and a preparation method thereof.The preparation method comprises the steps that the surface of a graphene film is cleaned and punched, and the graphene film with micron-sized pores in the surface is obtained; sequentially plating a layer of active metal film and a layer of heat-conducting metal film on the surface of the graphene film, and cutting to obtain a graphene film; graphene films are overlaid layer by layer to obtain a laminated material, and the two ends of the laminated material are clamped to a hot-pressing mold to be subjected to hot-pressing welding treatment, so that a locally connected flexible heat conduction section is obtained; and the flexible heat conduction section and the heat conduction metal shell are assembled, a soldering lug is placed for brazing and finish machining, and the flexible graphene film heat conduction cable is obtained. According to the method, the internal connection problem of the flexible section is solved by establishing a synergistic process of surface punching, double-layer coating and hot pressing, the heterogeneous connection problem of the flexible section and the shell is solved in a manner of sampling coating and brazing, and through the synergistic effect of all links, the overall performance and reliability of the heat-conducting cable are remarkably improved.

The invention relates to the technical field of dissimilar material connection, in particular to a method for regulating and controlling molybdenum steel brazed joint intermetallic compounds based on transition elements. According to the technical scheme, the method comprises the following steps that a transition element coating is deposited on the surface of a molybdenum matrix, transition elements are selected from one or more of Ti, V, Nb, Zr, Hf and Ta, and the molybdenum matrix and a steel matrix are brazed through boron-containing Ni-based brazing filler metal; in the brazing process, the transition element and the boron element preferentially react to generate a transition element boride, and therefore generation of MoNiBintermetallic compounds is inhibited. According to the method, the transition element coating is introduced, a brazing interface reaction path is actively intervened and reconstructed from the thermodynamic angle, and the problem of continuous generation of the brittle MoNiBintermetallic compound in the molybdenum / steel brazing joint is fundamentally solved.

The invention is suitable for the technical field of heat dissipation of high-power electronic devices, and provides a copper-diamond-copper sandwich structure water-cooling radiator and a preparation method thereof.The main body structure of the water-cooling radiator is of a sandwich structure, the upper layer is copper, the middle layer is an MPCVD diamond polycrystalline or single crystal material, and the lower layer is copper; furthermore, the lower-layer copper can be of a special water cooling channel structure, and the purpose of liquid cooling heat dissipation is achieved. The middle diamond layer plays a role in rapidly guiding out heat of the chip, and the heat is taken away by the water cooling channel for heat dissipation. And the surface layer copper is convenient for processing during chip packaging. The sandwich structure is achieved through the AMB active brazing technology, the slurry of the middle layer is the nano-silver active solder, low-temperature brazing is achieved, the high-temperature thermal cycle reliability after welding is met, the technology has high application value, and powerful support is provided for next-generation water cooling heat dissipation.

The invention discloses a brazing method for an in-situ synthesis titanium-rich phase reinforced ceramic / metal joint. According to the method, the controllable in-situ reaction is realized in the ceramic-metal joint by designing the multi-element alloy brazing filler metal containing the Ti active element and matching with the gradient temperature control brazing process. The method specifically comprises the following steps: preparing multi-element alloy foil brazing filler metal containing 0.1-10wt.% of Ti; carrying out surface pretreatment on the connection surface; vacuum brazing is carried out by adopting two-section type heating and three-section type controlled cooling; and a titanium-rich reinforcement phase of 0.1-5 microns is generated in situ in the welding seam through a Ti element diffusion reaction. The method effectively solves the key technical problems that the mechanical strength of a ceramic / metal heterogeneous joint is reduced due to insufficient weld joint strength and concentrated accumulation of residual stress of the joint, and the like, and is particularly suitable for reliable connection requirements of precise components in the fields of aerospace, energy equipment and the like.

The invention relates to the technical field of material sealing, in particular to a high-performance insulating ceramic sealing method for a neutron tube, which comprises the following steps: sequentially carrying out organic solvent ultrasonic cleaning and argon plasma etching activation treatment on a sealing surface of a cylindrical high-purity aluminum oxide ceramic piece, and depositing a titanium transition layer through magnetron sputtering, the ceramic piece with the titanium transition layer is obtained; the sealing face of the kovar alloy cylindrical flange plate is subjected to acid pickling, an oxide layer is removed, cleaning and drying are conducted, and a metal sealing part is obtained; preparing an active brazing filler metal sheet; the components are assembled in sequence to form a pre-assembled component; the pre-assembled component is placed in a vacuum brazing furnace, axial pre-tightening force is applied to the pre-assembled component, sealing is completed, then cooling is controlled, and a sealing piece with an airtight brazing joint is formed; and carrying out annealing treatment to obtain a finished product sealing assembly. Therefore, the problems of low dielectric strength, large thermal expansion coefficient difference, difficulty in interface quality control and the like in the prior art are solved.

The invention relates to the technical field of vacuum brazing furnace temperature control, and discloses a vacuum brazing uniform heating and cooling system with multi-temperature-zone cooperative control. According to the system, a temperature deviation trend spectrum is generated by matching a multi-zone actual temperature curve with a workpiece target temperature curve, multi-temperature-zone energy dynamic rebalance is started accordingly, and a preliminary power scheduling atlas and collaborative cooling trigger nodes are generated. And then heat flow disturbance compensation amount caused by heat radiation of the hearth is calculated and integrated with the atlas and the nodes to form a unified final process control atlas, and the atlas comprises heating correction and cooling scheduling instructions at the same time. Predictive regulation and control of the furnace temperature change trend and active compensation of temperature interval thermal disturbance can be achieved, the heating process and the cooling process are highly coordinated, and the temperature uniformity and the process consistency of a large or complex workpiece in the brazing process are improved.

The invention discloses an automatic brazing device based on graphite rod indirect heating and a brazing method thereof, and relates to the technical field of precision part welding. The automatic brazing device comprises a high-frequency induction heating system, a graphite rod heating body, a temperature closed-loop control system, an automatic transmission and positioning system and a rapid cooling system; the automatic transmission and positioning system is used for clamping and moving a workpiece, the high-frequency induction heating system and the rapid cooling system are sequentially arranged along the moving path of the workpiece, a graphite rod heating body is arranged in an induction field and is subjected to induction heating, and the temperature closed-loop system monitors the temperature of the graphite rod heating body in real time and feeds back and controls the power of the induction field. And the rapid cooling system is arranged at a downstream station of the high-frequency induction heating system and is used for carrying out forced cooling on the welded workpiece. Rapid local heating, precise temperature control and instant cooling can be achieved, and therefore the elastic performance of a workpiece is effectively protected while the welding quality and efficiency are improved.

The invention provides a double-sided conduction AMB ceramic substrate and a manufacturing method thereof, and belongs to the technical field of ceramic substrates for power modules. The manufacturing method comprises the following steps: punching holes in a ceramic substrate; filling conductive metal slurry into the holes by using a screen printing machine and sintering at high temperature; brazing materials are printed on the two faces of the ceramic; the copper layer and the ceramic layer are laminated and then subjected to vacuum brazing; manufacturing a circuit; etching the solder layer of the AMB line groove to expose the ceramic; performing surface treatment; laser cutting; and conducting test and inspection. Two-sided conduction is realized through metal slurry hole filling and a high-temperature sintering process, the problem that conduction of an upper copper layer and a lower copper layer of a traditional AMB ceramic substrate cannot be realized is solved, the assembling size of a power module is reduced, the three-dimensional integration requirement of a high-end module is met, meanwhile, the technological process is reasonable, and the production cost is reduced.

The invention belongs to the technical field of brazing, and particularly relates to a contact-shaped composite brazing filler metal and a preparation method and application thereof.The preparation method comprises the steps that a sheet made of a material A is obtained; stamping the sheet by using a stamping die so that the surface of the sheet is bent to form a plurality of trapezoidal grooves to obtain a honeycomb array structure sheet; solder paste is sprayed and printed in the trapezoidal grooves of the honeycomb array structure sheets, and the solder paste comprises brazing filler metal B and scaling powder; the honeycomb-shaped array structure sheet sprayed with the soldering paste is put into a reflow oven to be heated, the brazing filler metal B in each trapezoid-shaped groove is melted to form a protruding contact, and a contact-shaped composite brazing filler metal sheet is obtained; wherein the scaling powder is separated out in the heating process and flows to cover the outer surface of the contact-shaped composite brazing filler metal sheet; the high-strength composite welding spot can be prepared, and the characteristics of low-temperature welding and high-temperature application are achieved.

The invention provides a DBA ceramic substrate low-temperature brazing manufacturing method based on laser surface modification, and relates to the technical field of brazing, the DBA ceramic substrate low-temperature brazing manufacturing method based on laser surface modification comprises the following steps: constructing a micro-nano groove in the surface of an aluminum nitride ceramic substrate through femtosecond laser; al particles are subjected to magnetron sputtering on the surface of the aluminum nitride ceramic substrate with the micro-nano grooves; and the Al-Si eutectic brazing filler metal is selected for brazing the aluminum nitride ceramic substrate and the aluminum material. Micro-nano grooves are constructed in the surface of the aluminum nitride ceramic substrate through femtosecond laser, and surface activation of the aluminum nitride ceramic substrate is achieved; al particles are subjected to magnetron sputtering on the surface of the aluminum nitride ceramic substrate with the micro-nano grooves, direct bonding of the aluminum material and AlN is promoted, meanwhile, Al-N-Al bonds are formed, connection of the aluminum material and AlN ceramic can be achieved through low-temperature brazing, the joint strength reaches 110 MPa, and the heat conductivity coefficient reaches 220 W / (m.K).