46 results about "Directional solidification" patented technology

This invention relates to a method for preparing ultra-pure smelting of high-strength and high-toughness special steel at ultra-low temperatures. The chemical composition (wt%) is controlled as follows: C≤0.01%, Si≤0.05%, Mn≤0.05%, S≤0.005%, P≤0.005%, Ni: 17.5~18.5%, Co: 8.0~9.0%, Mo: 3.0~3.8%, Al: 0.05~0.15%, Ti: 0.20~0.35%, H≤1.0 ppm, O≤16 ppm, N≤15 ppm, with the balance being Fe and other unavoidable impurities. Core Technology: A five-element synthetic slag system of CaO-SiO2-Al2O3-MgO-CaF2 is introduced during the VIM stage. Utilizing the high-speed directional solidification effect of VAR steady-state remelting, and through matching the smelting environment and cooling rate, the coarse, brittle titanium sulfide phase is transformed into finely dispersed Al-Mg-Ti-S-O multiphase composite oxides. This achieves composite modification of inclusions and reduces their number density from 45 inclusions / mm². 2 Reduced to 8.5 pieces / mm 2 It effectively eliminates the hazards of large particles >4μm. The average grain diameter of the original austenite is refined from 42.37μm to 26.38μm, the elongation of the material reaches 21.06%, and the impact energy is as high as 143.63J, significantly improving the resistance to brittle fracture and possessing extremely high engineering application value.

The application discloses a kind of second generation nickel-based single crystal superalloy recrystallization defect simulation and control method.The method steps are: according to sample preparation wax mold, after sand blasting, dry baking, manufacture ceramic shell;Through directional solidification preparation second generation nickel-based single crystal superalloy sample, control pulling speed, holding temperature and temperature gradient and other parameters;According to service condition preparation sample, simulate stress loading, in combination with heat treatment simulate actual service environment;Using electron backscattering diffraction and X-CT imaging, characterize recrystallization grain orientation distribution, three-dimensional morphology, content and thickness.Process parameter-defect characteristic mapping relationship is established, the stress distribution characteristics during preparation are clarified, the ceramic shell and preparation process are feedback controlled, and the control of recrystallization defects is realized.The application simulates the actual service environment of high-temperature alloy blade, and restores the performance of recrystallization defect sample in actual service environment.The application provides an experimental reproduction method and effective process control strategy for recrystallization defect research.

This invention relates to the field of high-temperature alloy technology, specifically to a method for improving the microstructure stability of single-crystal high-temperature alloys by controlling the nitrogen (N) content. The content of refractory elements in single-crystal high-temperature alloys increases with increasing heat resistance, leading to decreased microstructure stability and increased precipitation of topologically close-packed (TCP) phases, resulting in decreased mechanical properties. Based on the influence of N on the TCP phase precipitation behavior in high-temperature alloys, this invention proposes a method to effectively improve the microstructure stability of single-crystal high-temperature alloys by controlling the N content. By adding a certain amount of CrN or AlN during directional solidification to ensure an N mass content of 15-30 ppm in the single-crystal alloy, the amount of TCP phase precipitates in the alloy microstructure is significantly reduced after long-term high-temperature heat exposure, and the microstructure stability of the single-crystal alloy is significantly improved. This invention employs a simple and feasible method to effectively improve the microstructure stability of single-crystal high-temperature alloys.

The application discloses a kind of turbine blade grinding after fluorescent defect root control method and system, it is related to turbine blade technical field, the present application adopts computer full-process closed-loop control, first obtains tenon tooth solidification characteristic parameter, constructs directional solidification multi-physics field coupling model and is solved to obtain transient multi-physics field data set;Again, through paste zone width two-stage quantization calculation, the shrinkage high-risk interval in tenon tooth grinding allowance range is determined;Based on risk interval, the optimal incremental drawing time correction calculation is completed, and qualified directional solidification process parameters are generated and verified;Finally, control equipment executes process, and realizes process solidification or reverse iterative correction by acquisition detection data.The present application eliminates the aggregation of microscopic shrinkage from the solidification source, realizes defect root, precision prevention and control, and has strong stability, which can significantly reduce the reject rate of blade production.

This invention discloses a method for fine-grained billet preparation with low extrusion ratio and synergistic annealing of difficult-to-deform high-γ′ phase superalloys, comprising the following steps: raw material purification and batching preparation – vacuum induction melting – electron beam melting pretreatment – ​​initial molten pool establishment and stabilization melting – homogenization treatment – ​​hot extrusion and annealing heat treatment. The method utilizes electron beam droplet melting directional solidification technology to prepare difficult-to-deform superalloy ingots with continuous columnar crystal structure. Taking advantage of the significantly superior dislocation storage capacity of columnar crystals compared to traditional equiaxed crystals, and combining low extrusion ratio billet preparation with subsequent precision recrystallization annealing, this method effectively avoids the problems of easy cracking, uneven microstructure, and high cost in high extrusion ratio dynamic recrystallization processes, breaking the stringent limitations of traditional processes on the lower limit of the extrusion ratio. Compared with traditional high extrusion ratio billet preparation processes, the material yield is increased from 60%–75% to 80%–90%, an increase of 15%–25%, significantly reducing the extrusion cracking scrap rate and improving the overall microstructure consistency of the bars.

The application discloses a metal oxide dispersion strengthening coating and a preparation method thereof, and belongs to the technical field of metal surface strengthening. The method comprises the following steps: depositing a metal film on the surface of a directional solidification high-temperature alloy base; then, performing micro laser impact on the surface of the directional solidification high-temperature alloy base after the metal film is deposited by taking water as a constraint layer, so that the metal film and the surface of the directional solidification high-temperature alloy base are remelted, and oxygen in the water reacts with the metal in the remelted metal film in situ, and finally, a metal oxide dispersion strengthening coating which is metallurgically combined with the directional solidification high-temperature alloy base without an interface and keeps consistent with the crystal orientation of the directional solidification high-temperature alloy base is formed. The method fundamentally solves the defects of traditional external coating, such as insufficient bonding force, easy peeling and damage to the directivity of the directional solidification high-temperature alloy.

The application discloses layered multi-scale TiB2 and TiB w The application discloses a preparation method of a hybrid aluminum matrix composite material. The method relates to the technical field of high-strength and high-toughness aluminum matrix composite material preparation. The method comprises the following steps: ball-milling Ti powder and TiB2 powder to uniformly mix the powders; adding deionized water, a dispersing agent and a binder into the mixed powders, uniformly mixing the powders, and preparing uniformly dispersed slurry; pouring the slurry into a mold, placing the mold on a cold source, and performing directional solidification; placing the solidified slurry in a vacuum drying machine, performing freeze drying, and preparing a ceramic green body preform; placing the ceramic green body preform in a furnace, performing sintering, and preparing a ceramic preform; placing the ceramic preform in a hot working mold, performing heating and heat preservation, pouring prepared aluminum melt into the hot working mold, performing pressure infiltration, and preparing an ingot; and performing solid solution and aging treatment on the ingot. The aluminum matrix composite material has high-strength and high-toughness mechanical performance characteristics, and can be used for manufacturing load-bearing structural parts in various fields.

The application belongs to the technical field of non-ferrous metal purification, and particularly discloses a method for preparing 5N high-purity copper by electron beam reduction and induced directional solidification, which comprises the following steps: loading pretreated 4N cathode copper into an electron beam smelting furnace feeding mechanism and independently vacuumizing each part of the furnace body; starting a high-voltage power supply and an electron gun preheating, and heating and melting the 4N cathode copper by No.1 electron gun at 150-200 kW and 0.5-1 kV and then flowing into a crystallizer; when the copper liquid fills 2 / 3 of the crystallizer, starting No.2 and No.3 electron guns and keeping the copper liquid in the crystallizer molten at 50-100 kW and 20-40 kV; after the copper liquid fills the crystallizer, reducing the power of No.3 electron gun to 5 kW; when the melt in the crystallizer starts to crystallize, slowly pulling the ingot into a cooling area; after the cast ingot enters the cooling area completely, cutting off the impurity enrichment area of the cast ingot to obtain 5N high-purity copper. The application has the characteristics of simple process, short production cycle, small impurity enrichment area and low oxygen and hydrogen content.

This invention relates to the field of precision casting technology and discloses a method for directional solidification casting of high-strength gas turbine blades. The method includes: adding solid inorganic fibers, hollow ceramic fibers, boehmite sol, and scorchable organic short fibers to a ceramic shell slurry; preparing a shell green body through multi-layer coating; dewaxing with high-pressure steam; and calcining in an air atmosphere. The organic short fibers scorch to form three-dimensional interconnected permeable micropores, and the boehmite sol is converted in situ into an alumina ceramic bonding phase, resulting in a multifunctional composite fiber-reinforced ceramic shell; the shell is then placed in a directional solidification furnace to pour high-temperature alloy melt, completing the directional solidification casting. This invention, through the synergistic effect of four functional components, simultaneously achieves shell toughening and thermal shock resistance, reduces lateral thermal conductivity, improves permeability, and strengthens the fiber-matrix interface bonding, effectively reducing casting porosity defects, improving the axial temperature gradient during directional solidification, and enhancing the quality of the blade casting.

This invention discloses a method for preparing high-strength, high-conductivity, and high-ductility pure copper rods. Using 4N-grade high-purity oxygen-free pure copper ingots as raw materials, the rods undergo pretreatment including mechanical grinding and plasma polishing. Following this, they are sequentially subjected to vacuum dynamic melting and composite purification, directional solidification texture optimization, ultrasonic-assisted warm drawing-asynchronous rolling composite deformation, and gradient aging-low-temperature stress release composite heat treatment. Finally, the finished product is obtained after finishing and inspection. This invention improves melt cleanliness through the synergistic effect of composite purification agents, optimizes grain texture through directional solidification, refines grains and eliminates internal stress through ultrasonic-assisted composite deformation, and achieves a synergistic improvement in strength, ductility, and electrical conductivity through gradient aging heat treatment. The prepared pure copper rods exhibit excellent and stable electrical conductivity, mechanical properties, and ductility, meeting the requirements of high-end applications.

The application discloses a preparation method of high-hardness wear-resistant aluminum bronze alloy and belongs to the technical field of metal materials. The method is characterized by accurately controlling the content of aluminum to be 8.5-10.5%, the content of iron to be 3.0-5.0%, the content of nickel to be 2.0-4.0%, the content of manganese to be 0.8-1.5%, the content of silicon to be 0.1-0.4%, the content of titanium to be 0.05-0.20% and the content of zirconium to be 0.03-0.15%, and combining magnetic field assisted directional solidification and multi-stage heat treatment to realize the synergistic strengthening of beta' martensite and fine dispersed phase in a single matrix. The obtained alloy has a Vickers hardness of greater than or equal to 320HV, a wear rate of less than or equal to 2.5*10-6 mm3 / (N*m), an elongation of greater than or equal to 8%, and high hardness, high wear resistance and good plasticity and toughness. The application aims at solving the problems of insufficient reliability, uneven structure and industrialization difficulty caused by the dependence on surface coating or the introduction of endogenous hard phase in the prior art.

A method for setting the orientation of single crystal grains or directionally solidified grains within an additively manufactured single crystal or directionally solidified component, comprising casting a single crystal structure, slicing the cast single crystal structure into discs, surface grinding the discs; and press fitting the discs into a holding fixture, thereby forming a seed plate.

The application discloses a mechanical property regulation and control method for preparing high-purity aluminum by hydrogen atmosphere assisted directional solidification, and realizes directional control of the mechanical property of the high-purity aluminum by regulating and controlling hydrogen pressure and solidification parameters. In the range of 0.2-0.6 MPa hydrogen pressure, with the change of the hydrogen pressure, the Vickers hardness of the product can be adjusted in the range of 18.5-21.5 HV: when the hydrogen pressure is 0.2 MPa, the structure is uniform and stable, and the hardness is 18.93 HV; when the hydrogen pressure is 0.4 MPa, the number of H-vacancy complexes reaches a peak, and the hardness can be as high as 21.02 HV; when the hydrogen pressure is 0.6 MPa, the uniformity of the structure is the best, and the hardness fluctuation is the smallest. By controlling the hydrogen pressure, the occurrence state (solid solution hydrogen, H-vacancy complex, molecular hydrogen cluster) of hydrogen in aluminum can be regulated and controlled, and then the strengthening mechanism and the mechanical property of the material are influenced. The method can realize directional regulation and control of the mechanical property of the high-purity aluminum by single directional solidification, and is simple in process, low in cost and suitable for the differentiated demand for the mechanical property in different application scenarios.

This invention discloses a method for preparing high-purity rare-earth ferrosilicon alloys, belonging to the field of pyrometallurgical technology. Addressing the stringent purity requirements (oxygen content ≤50ppm, sulfur content ≤100ppm) for rare-earth ferrosilicon alloys in high-end manufacturing, and the technical challenges of deep removal of impurities and poor compositional uniformity in existing preparation processes, this invention provides a method for preparing high-purity rare-earth ferrosilicon alloys integrating "deep raw material purification - multi-stage vacuum refining - directional solidification purification - application-oriented compositional control". The method includes: preparing an intermediate alloy using high-purity rare-earth oxides, high-purity silica, and steel scrap as raw materials through carbothermic reduction; placing the intermediate alloy in a vacuum induction melting furnace and performing multi-stage refining under a vacuum of ≤10Pa, selectively removing volatile impurities through segmented temperature control; performing deep deoxidation and desulfurization using composite refining agent injection technology; achieving interfacial segregation separation of impurity elements through directional solidification technology; and finally, performing atmosphere-protected annealing and compositional fine-tuning according to the target application field. Based on the multi-stage synergistic purification mechanism of "thermodynamic selective volatilization-kinetic spray reaction-crystal growth interface segregation", the rare earth ferrosilicon alloy prepared by this invention has an oxygen content of ≤45ppm, a sulfur content of ≤80ppm, and a rare earth element distribution non-uniformity of ≤±2%, which meets the application requirements of high-end fields such as aerospace high-temperature alloys, nuclear reactor control materials, and semiconductor sputtering targets.

This invention relates to the field of titanium melting and casting technology, specifically disclosing an EB furnace titanium melting and casting device, comprising: a pretreatment system, a melting system, and an ingot forming system; the pretreatment system performs spectral sorting, shaping, cleaning, drying, and closed-loop transfer to screen components, remove impurities, and provide clean protection; the melting system uses a multi-gun EB furnace as its core to melt, refine, and maintain the temperature of the molten titanium in a vacuum environment; the ingot forming system achieves directional solidification of the molten titanium, eliminates defects, and after anti-oxidation cooling and transfer, the post-treatment device performs multi-dimensional flaw detection and automated classification and transfer; through a fully automated collaborative design, the device achieves impurity removal and clean protection throughout the entire process from raw material sorting to drying, solving the problem of ingot performance degradation caused by impurities, and through automated transfer and multi-dimensional precise flaw detection, it solves the problems of secondary oxidation of ingots, missed detection, and low efficiency during the post-treatment process.

A casting system for forming a directionally-solidified casting component is provided. The casting system defines an axial direction, a radial direction, and a circumferential direction. The casting system includes a chamber and a baffle plate disposed within the chamber. The chamber and the baffle plate collectively define a heating zone and a cooling zone. The heating zone and the cooling zone are separated by the baffle plate. The casting system further includes a shaft and a cooling plate disposed on the shaft. The cooling plate is movable between the heating zone and the cooling zone. A mold shell is disposed on the cooling plate. The casting system further includes a cooling system for directing a coolant fluid towards the mold shell.

This invention belongs to the field of single-crystal high-temperature alloy casting, specifically a comprehensive evaluation system and optimization method for the casting processability of single-crystal blades. The method includes the following steps: constructing a module for evaluating casting processability, which comprises at least one single-crystal casting and its associated structures; simulating the directional solidification process of the casting module through numerical simulation to obtain the physical field distribution information of the casting process; identifying casting defect risk areas based on the physical field distribution information and evaluating the casting process performance; optimizing and adjusting the module structural parameters and process parameters based on the evaluation results; comparing the optimized scheme with experimental data to establish a correlation mechanism between module design, casting geometry, and alloy system, thereby achieving iterative optimization and solidification of the casting process. This invention improves the reliability of single-crystal blade casting processes and reduces trial-and-error costs through simplified module design, multi-physics simulation and defect identification, multi-objective optimization, and experimental feedback learning.

This invention discloses a method for controlling impurities in single-crystal blades. An adjustable heat-insulating baffle is positioned in the cold zone below the heat-insulating carbon felt in a directional solidification furnace, with its leading edge close to the blade body of the blade shell. A control module is connected to the adjustable heat-insulating baffle. The control module includes a drive unit controlled by a preset program. During the directional solidification of the blade shell, when the edge plate of the blade shell enters the transition area between the heat-insulating carbon felt and the adjustable heat-insulating baffle, the control module drives the adjustable heat-insulating baffle to move below the edge plate, providing heat insulation and preventing premature cooling of the edge plate tip. During the shell's descent, the control module controls the adjustable heat-insulating baffle to extend or retract, moving it below the heat-insulating carbon felt to prevent obstruction of the shell's descent. This invention can effectively control impurities in the edge plate of single-crystal blades, resulting in blades with a complete single crystal structure from the blade body to the edge plate.

This invention discloses a gradient-strengthened dual high-carbon phase MoCr alloy cast iron and its preparation process, belonging to the technical field of alloy cast iron materials. This alloy cast iron contains 3.0-3.2% C and 1.7-1.9% Si by mass percentage, with a carbon equivalent of 3.7-3.9%. It forms a gradient structure from the surface to the core, consisting of a carbide-rich layer, a transition strengthening layer, and a matrix layer. The carbide content, graphite morphology, and grade of each layer are gradient-adapted, and the mechanical properties meet the requirements of tensile strength ≥390MPa and quenching hardness 56-59HRC. The preparation process includes raw material pretreatment and precise batching, segmented melting and gradient inoculation, directional solidification and gradient cooling, gradient heat treatment and performance regulation, and can also include surface strengthening and defect repair steps. This invention achieves a synergistic improvement in material strength, toughness, wear resistance, and fatigue resistance, completely eliminates the problem of quenching pitting, is compatible with existing production lines, has low raw material costs, and a high casting yield rate, making it suitable for the manufacture of cold stamping and drawing dies for automotive body panels.

This invention relates to the field of nickel-based superalloy technology, and provides a method for designing the composition of a nickel-based directionally solidified superalloy and a nickel-based directionally solidified superalloy. The design method includes the following steps: S1, initially determining the element types and content ranges of the nickel-based directionally solidified superalloy; S2, based on the element types and content ranges, constructing an oxidation index model, a creep rupture performance model, and a casting performance model, using the content of key elements as variables; S3, using the oxidation index model, creep rupture performance model, and casting performance model to calculate the data of the key element content ranges, and by setting the boundary conditions of the above models, selecting the content ranges that meet the requirements, thus obtaining the composition range of the nickel-based directionally solidified superalloy. The nickel-based directionally solidified superalloy provided by this application has the advantages of both high-temperature creep rupture performance and low cost.

The application relates to the technical field of high-purity metal target material preparation, in particular to a large-size fine-grain metal lanthanum target material and a preparation method thereof. The method comprises the following steps: S1, under the condition of double-frequency ultrasonic treatment, high-purity metal lanthanum is subjected to suspension smelting and down-drawing ingot drawing to obtain an ingot; the double-frequency ultrasonic treatment condition comprises high-frequency ultrasonic treatment with a frequency of 80-100 kHz and low-frequency ultrasonic treatment with a frequency of 45-55 kHz; during the down-drawing ingot drawing process, at least three sections of independent temperature control crystallizers distributed along the ingot drawing direction are used to perform directional solidification on the melt, S2, the ingot is cut to obtain a target blank with a set thickness; S3, the target blank is sequentially subjected to rolling, correction, secondary annealing and precision machining to obtain a metal lanthanum target material with a target size. Through the above method, a large-size metal lanthanum target material with uniform structure and low average grain size can be obtained.

The application discloses a rapid directional solidification device and a rapid directional solidification method. The device comprises a material placing bin, a plurality of electron gun heat sources, a fixing assembly and a driving assembly. In the working process, the material to be grown is placed in the material placing bin, the material is positioned and clamped through the fixing assembly, and the driving assembly is started to stably rotate the material. The plurality of electron gun heat sources arranged at intervals in the circumferential direction of the material placing bin are turned on, and the high-energy beam uniformly heats the rotating material, so that the specified area of the material is gradually melted to form a stable melting zone. Then, the driving assembly moves the material downward, and the melting zone shape and temperature field are kept stable under the synergistic action of the electron gun heat source and the liquid metal cooling, and the crystal growth process is completed. The rapid directional solidification device can realize controllable rapid directional solidification in a very wide cooling rate range (10 1 ~10 6 K / s order of magnitude), and the rapid directional solidification method can prepare single crystal and oriented polycrystal materials with non-equilibrium structures.

The utility model relates to metal material processing technical field, concretely relates to a copper pole directional solidification mould and device, the copper pole directional solidification mould, including graphite pipe and ceramic ring, the graphite pipe is equipped with the pouring cavity for pouring copper liquid along the axial direction in the graphite pipe upper and lower end surface through, the graphite pipe includes the upper section, the recess section and the lower section fixed connection in proper order from top to bottom, the wall thickness of upper section is greater than the wall thickness of recess section, the height of lower section is greater than the height of upper section with recess section sum, the ceramic ring is sleeved in the outer periphery of recess section, the inner wall of ceramic ring with the outer wall of recess section fixed connection. The copper pole directional solidification device includes the copper pole directional solidification mould, continuous casting furnace, heat preservation pad and water -cooling copper cover. The copper pole directional solidification mould structure of the application is simple, and the assembly with continuous casting furnace is practical, can prepare the copper pole with directional solidification organization characteristic, is favorable to realize the industrialization popularization.

A method for preparing a Sm magnetic alloy with high preferential orientation, comprising the following steps: S1: adding granular raw materials of Sm, Fe and Ti into an arc melting furnace; S2: after purging the arc melting furnace, inert gas is filled; S3: under the protection of inert gas, the raw materials are melted into an ingot, and then sucked into a rod-shaped master alloy; S4: the rod-shaped master alloy is taken out of the arc melting furnace and placed in a directional solidification furnace; S5: the furnace body of the directional solidification furnace is vacuumized, purged and filled with inert gas; S6: the master alloy is heated to 1500 DEG C in the directional solidification furnace, so that the alloy is melted; S7: after the master alloy is melted, homogenization is carried out, the alloy melt is homogenized, then seeding is started, the melt is separated from the induction heating area, and the one-way heat conduction of the copper water-cooled sample table is matched, so that the alloy melt is directionally solidified, and finally a Sm permanent magnetic alloy with high preferential orientation is obtained. The Sm magnetic alloy prepared by the method has high consistency in preferential orientation, high proportion of main magnetic phase SmFe11Ti, small segregation, short process and high efficiency.

The application discloses a method for preparing Sc-Er synergistically reinforced Al-Zn-Mg-Cu alloy by electromagnetic directional solidification, and belongs to the technical field of aluminum alloys. The alloy composition comprises Zn, Mg, Cu, Sc, Er, the balance of Al and inevitable impurities. The vacuum induction melting furnace is used for electromagnetic directional solidification, under the synergistic action of an alternating electromagnetic field and a water-cooled copper mold, the coupling of melt electromagnetic stirring and directional heat flow is realized, the grain is significantly refined, and the composition segregation is inhibited. After subsequent homogenization, hot working and aging treatment, the Sc-Er synergistic effect is used to precipitate high-density, heat-stable L12 type Al3(Sc, Er) nanometer dispersed phase in the matrix. The phase and the η' phase precipitated during aging form a double-peak strengthening system, effectively pinning the grain boundary, inhibiting recrystallization and phase coarsening. The application solves the problems of low toughness and poor heat resistance of high-Zn alloy, and realizes the synergistic improvement of strength, toughness and heat stability.

This invention discloses a corrosion-resistant reinforced ultrapure ferritic stainless steel and its thin-walled component precision casting process. The stainless steel, by mass percentage, comprises C 0.006%–0.010%, N 0.006%–0.010%, Cr 21.10%–21.50%, Mo 2.45%–2.60%, Ti 0.29%–0.32%, Nb 0.40%–0.42%, Sn 0.10%–0.13%, Cu 0.65%–0.75%, Ce 0.045%–0.055%, W 0.65%–0.80%, B 0.006%–0.008%, as well as controlled impurities and the Fe balance, and satisfies PREN ≥ 29.5, Ce / Ti = 0.141–0.190, and Nb / Ti = 1.25–1.45. The process includes vacuum induction melting, electroslag remelting, gradient shell preparation, vacuum anti-gravity nonlinear pressure boosting casting, controlled solidification, and post-cast composite heat treatment. This invention improves the filling integrity, inclusion cleanliness, pitting corrosion resistance, and intergranular corrosion stability of thin-walled precision-cast components through Cr-Mo-W-Sn-Cu corrosion resistance synergy, Nb / Ti ratio stabilization, Ce inclusion modification, and thin-walled directional solidification control.

This application relates to a directional solidification soldering method for IGBT module signal terminal assemblies. The method includes: inserting metal terminals into an insulating housing and abutting against substrate solder paste; heating and pumping liquid solder into an anchoring groove on the inner wall of the housing using open capillary slits of the terminals; establishing a vertical temperature gradient with a lower temperature at the top than at the bottom, controlling the solder in the anchoring groove to solidify preferentially, and using the liquid solder at the bottom to compensate for the solidification shrinkage at the top. This application has the advantages of effectively eliminating voids caused by solidification shrinkage inside the solder joint, achieving a dense, defect-free rigid interlock between the terminals and the housing, and significantly improving the mechanical strength and reliability of the module packaging.

This invention discloses a preparation process for a wear-resistant copper alloy for headphone wire cores, belonging to the field of copper alloy processing technology. The process uses high-purity electrolytic copper as the matrix, adding trace alloying elements Ag, Ni, Sn, Ge, La, and Y, with a total doping amount ≤0.8wt%. The target copper alloy is obtained through vacuum segmented melting, directional solidification continuous casting, grain boundary stabilization pretreatment, and two-stage graded aging. The first stage of vacuum melting is used to melt Cu, Ag, and Ni. The second stage adds volatile elements under a lower vacuum and protective atmosphere, followed by directional solidification to obtain columnar crystal casting rods. Pretreatment achieves pre-enrichment of grain boundary elements, and two-stage aging causes in-situ precipitation of dispersed dual-nano phases at the grain boundaries. This invention's process can suppress element burn-off and eliminate microstructure segregation. The resulting alloy possesses high conductivity, high tensile strength, excellent plasticity, low coefficient of friction, and high resistance to bending fatigue, solving the problem of traditional headphone wire core materials struggling to simultaneously achieve conductivity, toughness, and wear resistance.

The application discloses a control method of a multi-output induction heating power supply, and belongs to the technical field of induction heating power supplies, and comprises the following steps: S1, receiving the time-sharing sequence control instruction, and turning on an arbitrary output loop; S2, receiving the closed-loop adjustment amount of the output loop, and adjusting the on time and the pulse cycle number according to the feedback value within the start-stop time of the output loop; when the feedback value reaches a set value, the output loop stops running, after a dead time, an arbitrary output loop different from the current running loop is turned on, and the same loop cannot be turned on repeatedly in the same total adjustment cycle; and S3, circulating S2 until an end instruction is received. Through the time-sharing sequence control on the output loop, the problems of the simultaneous output of power of each coil, the electromagnetic coupling between the coils and the increased coil loss in specific occasions, such as crystal growth, epitaxy and single crystal directional solidification, which need stable and uniform temperature fields or temperature gradient temperature fields, are solved, and the control method has a good energy-saving effect.