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1403 results about "Electromagnetic stirring" patented technology

Method for synthesizing metal matrix composition using metal reaction under the coupling action of magnetic field and ultrasonic field

The invention relates to a method for preparing endogenetic particle reinforced metal matrix composites under the coupling effect of a magnetic field and supersonic waves. The method comprises: adjusting the temperature of a metal matrix fused mass to the reaction initial temperature after refining, adding a reactant which can generate a particle phase with the fused mass through the reaction in situ for implementing the synthesis reaction, standing the mixture after the reaction is over, and cooling the mixture to the pouring temperature for pouring; and the method is characterized in that: the magnetic field and the high-intensity ultrasonic field are simultaneously exerted in the reaction synthesis process to realize the synthesis of endogenetic particle reinforced metal matrix composites under the coupling effect of the magnetic field and the high-intensity ultrasonic field. The magnetic field can be an intense pulse magnetic field, a high frequency oscillation magnetic field or a low frequency alternating magnetic field. In the method, the coupling effect of the magnetic field and the ultrasonic field makes the particle sizes be thinned and dispersed evenly; the ultrasonic vibration agitation and electromagnetic stirring functions improve the composite dynamic condition, and the compounding of the particle phase and a base metal interface is better; and the co-action of magnetochemistry and sonochemistry improves the thermodynamic condition of the reaction in situ, as well as speeding up the reaction in situ and controlling the growth of the particle phase.
Owner:JIANGSU UNIV

Electromagnetic current coupling field assisted hybrid melting-brazing method for laser-TIG arc and equipment

The invention discloses an electromagnetic current coupling field assisted hybrid melting-brazing method for a laser-TIG arc and equipment. In addition to the use of the welding zone, an alternating magnetic field is added to control properties of plasma formed through ionization of laser, arc and a raw material metal, thereby improving the laser utilization rate. Under the electric field assisted comprehensive effect, the weld melting depth is increased, and the assistant effect on the melting bath of the liquid-state brazing filler metal for laser-arc melting-brazing is realized through electromagnetic stirring and excitation and enhancement, thereby promoting the orderly flow of the liquid-state brazing filler metal and the rupture, wetting, spreading and proliferation of the liquid-state brazing filler metal on the surface of the high metal material, improving the full mixing of the liquid-state brazing filler metal and the base metal formed by melting the low-melting-point metal material, improving the uniformity of the components of the brazed weld, stabilizing the welding process, reducing welding defects, increasing the welding speed, improving the weld formation, optimizing the structure and performance of the brazed weld, and improving the quality of the brazed joint. Moreover, the equipment has the advantages of simple structure, flexible application, low cost, good effect and easy realization.
Owner:CHONGQING UNIV

High-entropy alloy powder containing amorphous nanocrystalline and fabrication method thereof

The invention relates to high-entropy alloy powder containing amorphous nanocrystalline and a fabrication method thereof. A high-entropy alloy coating is composed of, by atomic percent, 14.3% of Al, 14.3% of Fe, 14.3% of Co, 14.3% of Ni, 14.3% of Cr, 14.3% of Mo and 14.2% of Si, and the total percentage is 100%. The fabrication method includes the following steps: S1, high-entropy alloy master alloy is fabricated through a medium-frequency induction smelting technique, wherein weighed metallic raw materials are put in a carborundum crucible in sequence and according to melting points from low to high, then the carborundum crucible is vacuumized until the pressure is lower than 6.0*10MPa; argon gas is inflated in the carborundum crucible, the metallic raw materials are melted under the condition that the pressure of the argon air is 3*10-2 Pa, the smelting current is 75A, the melting time is 25min, the alloy composition is segregated with the assistance of electromagnetic stirring, the alloy composition is poured into a magnesia framework after the alloy composition is melted completely, and the high-entropy alloy master alloy which is even in ingredients is obtained; S2, high-entropy alloy powdered materials are fabricated through gas atomization equipment. The fabrication method of the high-entropy alloy powder is used for fabricating the high-entropy alloy coating containing the amorphous nanocrystalline or bulk alloy materials of more superior performance.
Owner:ACADEMY OF ARMORED FORCES ENG PLA

Visual gas hydrate dynamic experimental device

The invention provides a visual gas hydrate dynamic experimental device. The visual gas hydrate dynamic experimental device comprises a visual electromagnetic stirring reaction still, a voltage stabilizing pre-cooling gas supplying unit, an gas exhaust unit, a liquid charging / discharging unit, a temperature control unit and a data collecting and processing unit, wherein the visual electromagnetic stirring reaction still is used for mixing experimental gas and experimental liquid in the reaction still for reaction to form and decompose hydrate; the voltage stabilizing pre-cooling gas supplying unit and the gas exhaust unit are used for supplying pre-cooling experimental gas for the visual electromagnetic stirring reaction still and discharging gas; the liquid charging / discharging unit is used for injecting the experimental liquid to the visual electromagnetic stirring reaction still or discharging the experimental liquid; the temperature control unit is used for controlling the temperature change of the visual electromagnetic stirring reaction still; the data collecting and processing unit is used for collecting, processing, saving and analyzing kinetic parameters during a hydrate formation and decomposition process. According to the visual gas hydrate dynamic experimental device, numerous defects of a common hydrate dynamic experimental device are overcome, the kinetic properties in a nucleation phase and a growth phase of gas hydrate can be accurately determined, and the experimental device is simple, economical and convenient to operate.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI

Micro alloying SWRH87B hot rolled wire rod and manufacturing method thereof

The invention provides a micro alloying SWRH87B hot rolled wire rod and a manufacturing method thereof, belonging to the technical field of hot rolled wire rod. In the invention, Cr and V micro alloying are adopted; double slag process high drawing carbon operation is used in a converter; end-point carbon is controlled at 0.40-0.60%, the steel tapping temperature is 1580-1620 DEG C, and the slag-blocked tapping is used; low nitrogen carburant is used for recarburization; Si-Ca-Ba is used for deoxidation; 600-800kg synthetic slag is added into each converter; oxygen activity is controlled below 10ppm by entering into an LF refining station, and the refined finishing slag sum of FeO and MnO is no more than 3%; inclusion modification treatment is carried out on the Ca-Si line; a billet in the size of 160mm*160mm is used, a casting mould is used for coordinating with final electromagnetic stirring (F-EMS); continuous casting machine whole protection, constant drawing speed casting and proper secondary cooling system are adopted; the initial rolling temperature is controlled at 1020-1150 DEG C which is conductive to welding the drawholes and increasing the probability of the drawholes welding; the water pre-cooling and phase transformation strengthening cooling technology is used to control the texture and the performance. The invention has the advantages that the aging time of the wire rod before the follow-up processing is shortened, the tensile strength thereof after aging time is larger than 1280MPa, and the area reduction rate is larger than 25%.
Owner:SHOUGANG CORPORATION

Electromagnetic stirring and vibration combined device for preparing semi-solid slurry of black metal

The invention relates to an electromagnetic stirring and vibration combined device for preparing semi-solid slurry of a black metal. The device comprises three main sections: a melting furnace, a stirring chamber, and a crystallizer or a rheologic conveyor, wherein the melting furnace is arranged at the upper part of the stirring chamber, and the crystallizer or the rheologic conveyor is arranged at the lower part of the stirring chamber. When molten metal is poured into the melting furnace, a medium-frequency induction heater is used for maintaining temperature and uniformly heating; when the temperature of the molten metal is within the liquidus temperature range, the molten metal is poured into a stirring crucible in a quantitative amount, and a non-dendritic fine equiaxial spherical or nearly spherical microstructure is obtained by electromagnetically stirring and mechanically vibrating the molten metal; and the prepared fine nearly spherical semi-solid slurry is poured into the crystallizer, then cooled and solidified into a blank, or the slurry is poured into the rheologic conveyor and then is rapidly conveyed to a forming mold for rheoforming. The device can be used for preparing semi-solid slurry of a black metal and nonferrous metal, which improves the efficiency and the quality for preparing metal semi-solid slurry and shortens the preparation time. The device is especially suitable for rheoforming.
Owner:XI AN JIAOTONG UNIV

Method for preparing monodisperse polystyrene microsphere with controllable grain diameter

The invention belongs to the technology field of nanometer materials preparation, particularly relates to a preparation method of monodisperse polystyrene microspheres capable of controlling the particle size of the polystyrene microspheres within a certain range by changing the use amount of a stabilizer. The invention prepares polystyrene microspheres with simply purified styrene as a monomer, potassium persulfate as an initiator, water as a reaction medium and polyvinylpyrrolidone as a stabilizer by using soap-free emulsion polymerization. The preparation method uses electromagnetic stirring instead of electric stirring; and has the advantages of relatively low requirements for the uniformity of stirring speed, no need of surfactant, simple process, and low cost. The obtained polystyrene microspheres have good monodispersity, and the particle size thereof can be controlled within the range of 250-1,400nm by changing the use amount of the stabilizer. The monodispersed polystyrene microspheres have important application value as a module or template in construction of photonic crystals, inorganic / organic nanometer composite materials and hollow micrometer / nanometer spheres.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI

Method for preparing semi-solid alloy rheological slurry or billet through annular-gap type electromagnetic stirring

InactiveCN101745629AAvoid or reduce oxidationStir wellSlurryLiquid metal
A method for preparing semi-solid metal or alloy slurry or billet through annular-gap type electromagnetic stirring is hereinafter referred to as an annular-gap type electromagnetic stirring method in which the liquid metal or alloy liquid with 5-100 DEG C higher than the liquidus temperature is cast in an annular gap formed between an inner side wall of a slurrying chamber and an outer wall of an internal cooling controller. The metal or the alloy liquid is strongly stirred under the action of an electromagnetic induction rotary stirrer. Meanwhile, the cooling medium flowing in an external cooling controller and the internal cooling controller lead the temperature field of the slurry to be more uniform, thereby obtaining the fine and uniform semi-solid structure. The method is characterized in that the width of the annular gap formed between the inner side wall of the slurrying chamber and the outer wall of the internal cooling controller is 3-100mm. During preparation, the cooling medium is flowed in the external cooling controller and the internal cooling controller so as to lead the temperature field of the slurry to be uniform. The preparation method leads the stirring force field and the temperature field of the slurry to be more uniform, thereby obtaining the high-quality semi-solid slurry. The method has the advantages of simple preparation process, convenient operation, excellent shape of the semi-solid structure, uniformity and fineness and low preparation cost, and is particularly applicable to preparation of semi-solid aluminum or aluminum alloy, magnesium and magnesium alloy and other metal and alloy or composite material slurry or billet.
Owner:GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG

Ti-based powder preparing device and Ti-based powder preparing method

The invention discloses a Ti-based powder preparing device and a Ti-based powder preparing method. The device comprises a vacuum chamber, a magnetic suspension melting furnace, an atomization power processing chamber and a screening system. During working, when the magnetic suspension melting furnace is energized with high frequency alternating current, a high frequency alternating magnetic field can be produced in space around a coil, and the high frequency alternating magnetic field causes induction vortex in furnace charge. The induction vortex and the external alternating magnetic field interact with each other to produce suspension force for the furnace charge, and the suspension force is balanced with the dead weight of the furnace charge so as to enable the furnace charge to suspend; meanwhile, a vortex circuit generates a great deal of heat to melt the furnace charge, and the molten mass is subjected to deslagging, degassing and purification under the fierce function of electromagnetic stirring. The purified molten mass can fall into a gas atomization chamber by virtue of controlling the magnetic field; under the functions of a supersonic speed high-pressure argon atomizer and a cooling device, the molten mass is atomized into spherical Ti-based powder with high degree of sphericity, oxygen content of less than 1800 ppm and nitrogen content of less than 300 ppm.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI

Quick changeable temperature small-sized constant temperature sample pool

InactiveCN101281121APrecise and fast temperature controlMeet the requirements of constant temperatureMaterial analysis by optical meansWater/sand/air bathsTemperature controlMetallic materials
The invention relates to a quick variable temperature miniature thermostatic sample cell, which is made of metallic material, an opening is formed in the center of the metallic material and is used as a sample cavity, a light through hole is formed on a metallic shell along the center of the sample cavity, a transparent material is embedded in the light through hole, a Peltier temperature control element is glued on the non-light surface of the metallic material, a groove is arranged on the bottom of the metallic shell for laying aside a temperature sensor, the coat of the metal shell has a heat insulation outer frame, the center of a base connected with the bottom of the heat insulation outer frame is provided with a miniature motor, a small magnet is arranged at the edge of the leaf of a spiral leaf on the shaft of the motor, a stirring magneton is laid aside at the bottom in the sample cavity, the inner wall of the sample cavity and the outer faces of the sensor and the stirring magneton is carried on chemical inertia processing. The invention replaces the water heat conduction with the metal, and changes the system temperature with a thermo-element; the sensor directly observes the temperature of the sample, the heat conduction is speeded up by a miniature electromagnetic stirring system has accelerated; the invention is characterized in having small volume, accurate the temperature measurement, quick variable temperature, and good stability, etc, being able to be placed in analytical instrument such as spectrophotometer, etc., and realizing the quick variable temperature and the accurate thermostatic control of the temperature of the sample.
Owner:SHANGHAI JIAO TONG UNIV

Ultra-low carbon steel wire rod for electric conduction and production method thereof

The invention provides an ultra-low carbon steel wire rod for electric conduction and a production method thereof. The ultra-low carbon steel wire rod for electric conduction comprises the following chemical compositions: 0.002-0.005% of C, 0.004-0.010% of Si, 0.05-0.15% of Mn, less than or equal to 0.015% of P, less than or equal to 0.010% of S, 0.0050-0.0080% of total oxygen, and less than or equal to 0.0050% of total aluminum. The carbon content of smelted steel tapped from a converter is less than or equal to 0.040%, and the oxygen content of molten steel is 0.060-0.070%; natural decarburization is performed for 5-8 minutes in the first stage of RH refining; in the second stage of RH refining, after the carbon content is reduced to below 0.0030%, oxygen blowing is performed for 15-20 minutes, and a low-carbon or carbon-free steel ladle is adopted for smelting; the superheat degree of molten steel of a continuous casting tundish is less than or equal to 30 DEG C, the electromagnetic stirring current is greater than or equal to 400A, and the pulling rate is 0.5-0.7 m / min; the temperature of an entry double-module is 880-900 DEG C, the spinning temperature is 900-920 DEG C, the roller-bed speed is 0.2-0.4 m / s, and fans are completely closed. The electric conductivity of the wire rod disclosed by the invention is greater than or equal to 15%, the tensile strength is less than or equal to 300 MPa, and the area reduction index is greater than or equal to 80%, and the wire rod can partially replace copper conducting materials, thereby reducing the production cost.
Owner:ANGANG STEEL CO LTD

Low-energy-consumption electromagnetic stirring method for continuous casting and metal continuous casting device

InactiveCN102990027AReduce consumptionBarrier-free crossingAlloyEnergy consumption
The invention discloses a low-energy-consumption electromagnetic stirring method for continuous casting. The hot top composite novel low-energy-consumption electromagnetic stirring technique is used. A hot top is arranged in a crystallizer, a steady magnetic field with no energy consumption and low energy consumption is exerted on the periphery simultaneously, an electrode bar is inserted in a tundish, a roller electrode is arranged at the solidifying tail end of a continuous casting billet, and therefore alternating current can be exerted on all non-solidification metal melts between the crystallizer and the solidifying tail end. The alternating current and an additional steady magnetic field are acted with each other so as to enable all the non-solidification metal melts in the whole continuous casting billet in a continuous casting process to generate electromagnetic stirring force for driving the continuous casting melts to rotate clockwise and counterclockwise, thereby stirring non-solidification structures, smashing dendrites of solidification front edges of the melts, refining the solidification structures, reducing segregation and cracks. The invention further provides a metal continuous casting device which can be applied to a continuous casting process of various molten metals prone in segregation and draw an alloy continuous casting billet with refined solidification structure, small segregation and no crack.
Owner:SHANGHAI UNIV +1

Physical simulation method and physical simulation device utilizing suction casting to research solidification of strip continuous casting

The invention relates to a physical simulation method of the solidification process of strip continuous casting and a realization device thereof, which belong to the field of physical simulation and control of growth process of metal solidification structures. The invention provides a physical simulation method of the solidification process of the strip continuous casting process, so that a physical simulation test can reach the cooling rate of actual strip continuous casting to simulate the heat transfer process of the strip continuous casting; and the method researches an evolution law of solidification structures of the strip continuous casting and a basic law of the solidification by adjusting alloy element components and strip thickness, and can contrastively research an influence law of a rolling force on the solidification during the strip continuous casting. The invention provides a set of equipment which can realize physical simulation on the solidification process of the strip continuous casting. The invention designs a physical simulation device which has a concise structure and small scale and is flexible and smart, wherein main parameters of the device comprise that: the final vacuum is 6.6*10-4Pa, the radius of four water-cooled copper crucibles is 25mm, the working current is between 800 and 1,000A, and the rotating speed of electromagnetic stirring is between 0 and 200rpm.
Owner:SHANGHAI UNIV

Continuous casting bloom soft press technology based on tail end electromagnetic stirring

ActiveCN103121092AReduce dependenceThe effect of electromagnetic stirring is greatThermodynamicsHeat transmission
The invention provides a continuous casting bloom soft press technology based on tail end electromagnetic stirring and belongs to the field of metal casting. The continuous casting bloom soft press technology based on the tail end electromagnetic stirring is characterized in that after a tail end electromagnetic stirring device is arranged on a second cooling area, a previous air cooling area is straightened. The thickness of a liquid core controlling the position of the stirring device occupies 30% to 55% of the thickness of a casting blank through a solidification heat transmission mathematical model. Stirring current of the tail end electromagnetic stirring device is 350A to 750A and stirring frequency is 3Hz to 8Hz. When soft press and straightening are conducted simultaneously, complete solidification of liquid phase among columnar crystals is guaranteed and meanwhile total press amount of a press intersection is controlled to be 10mm to 25mm, liquid steel superheat degree of a tundish is 20 DEG C to 30DEG C, dragging speed of a continuous casting machine is 0.35m/min to 0.75m/min, and therefore internal quality of a continuous casting bloom is remarkably improved and high quality rolled metal is guaranteed. Continuous casting bloom bearing steel manufactured through the technology is continuously manufactured for over 10 boilers, occurrence of internal cracks is avoided, a central organization is dense and even, the rate that a center contracting hole <=1.0 reaches 97.54%, center C segregation is controlled to be under 1.06 and thus the internal quality of the bearing steel is remarkably improved.
Owner:UNIV OF SCI & TECH BEIJING

Titanium-based powder material preparing device

The invention discloses a titanium-based powder material preparing device. The titanium-based powder material preparing device is characterized by at least comprising a vacuum chamber, a magnetic levitation melting furnace, an atomizing chamber and a powder collecting unit, wherein the upper part of the vacuum chamber is provided with a feeding chamber; the magnetic levitation melting furnace is arranged inside the vacuum chamber; the atomizing chamber is arranged under and integrally connected with the vacuum chamber; the power collecting unit is composed of a powder collecting chamber arranged under the atomizing chamber. During application, after the magnetic levitation melting furnace is electrified by high-frequency alternating current, a high-frequency alternating magnetic field canbe generated in the space surrounding a coil and produce induced eddy current inside furnace materials, the induced eddy current interacts with an external alternating magnetic field to produce levitation force of the furnace materials, and the materials can be in a suspended state through the levitation force and by self-gravity; meanwhile, an eddy current loop can produce a large amount of heatto rapidly melt the furnace materials, and under the action of electromagnetic stirring, deslagging, degassing and purification are conducted; by controlling the magnetic field, the purified molten materials fall down into the atomizing chamber, and by means of a supersonic high-pressure argon atomizer and a cooling device, can be atomized into titanium-based powder.
Owner:FUJIAN INST OF RES ON THE STRUCTURE OF MATTER CHINESE ACAD OF SCI

Method and apparatus for preparing semisolid slurry for automobile aluminium wheel through compound modification refinement and electromagnetic stirring

A method and an apparatus for preparing a semisolid slurry for an automobile aluminium wheel through compound modification refinement and electromagnetic stirring. The method comprises steps of: transferring alloy with degree of superheat of 100-120 DEG C into a transit bag, adding a refinement modification agent with high purity nitrogen by an injecting device, wherein the refiner is Al-Zr-B-O intermediate alloy with a granularity of 150-200 um, and the alterant is Al-Sr-RE complex alloy with a granularity of 200-2505 um; standing for 5-8 min, pouring into an electromagnetic stirring crucible when a temperature is 40-50 DEG above a liquidus, putting the crucible in an electromagnetic stirrer, and carrying out composite stirring through a crucible peripheral stirrer and central stirrer, wherein the peripheral stirrer has a frequency of 10-20 Hz, a power of 12 kw, a rate of 300-500 rmp and a time of 2-3 min, and the central stirrer has a frequency of 5-15 Hz, a power of 1-2 kw, a rate of 300-800 rmp and a time of 2-3 min; stopping stirring, when a melt temperature drops to 10-15 DEG C below the liquidus, to obtain a near sphaerocrystal structure semisolid aluminium alloy slurry. The method solves problems of nonuniform slurry and low pulping efficiency.
Owner:JIANGSU KAITE AUTO PARTS

Continuous steel casting process and device with function of electromagnetic excitation compound mechanical stirring

The invention discloses a continuous steel casting process with a function of electromagnetic excitation compound mechanical stirring. According to the process, when alloy melt solidifies, microscopic and macroscopic strong shear flows are generated to break dendritic crystal by the electromagnetic excitation compound mechanical stirring technology, and accordingly, solidification structure refinement, full-equiaxed crystallization and solute segregation reduction are achieved, and alloy properties are improved. The invention further provides a continuous steel casting device mainly comprising a crystallizer, a rotor stirring paddle, a wheel, a program control motor, a magnetic field generator, a coil, and a voltage-regulating frequency-modulating alternating current source. The microscopic flows generated by electromagnetic excitation and macroscopic flows generated by mechanical stirring form complex chaotic flows which form strong shear flows to brake the dendritic crystal, crystal nucleus proliferation is prompted, temperature gradient is reduced, and ultrafine full-equiaxed crystal structure is achieved; meanwhile, segregation of alloy elements is significantly reduced or completely suppressed. The continuous steel casting process and method has the advantages that the energy consumption is significantly lower than that of conventional electromagnetic stirring and energy conservation is significantly effective.
Owner:新兴发展集团有限公司

Electroslag smelting casting device with additional electromagnetic stirring and method

The invention relates to an electroslag casting device additionally provided with electromagnetic stirring and a method thereof. The electroslag casting device belongs to the technical field of special steel electroslag metallurgy and comprises a crystallizer, a crystallizer water jacket and an electromagnetic stirrer; an annular magnet is sleeved on the outer wall of the crystallizer and positioned at the middle-upper part of the crystallizer, a loop is wound on an iron core of the annular magnet, an electromagnetic stirrer water jacket is arranged at the periphery of the annular electromagnet, and the electromagnetic stirrer water jacket is communicated with the crystallizer water jacket; a melting consumable electrode forms molten steel drops which then enter a slag layer; the molten steel drops fall down in a spiral line way in the slag layer under the action of the rotary electromagnetic field and then enter a steel ingot liquid tank; the steel ingot liquid tank raises continuously and also enters into an effective magnetic field action region of the electromagnetic stirrer; and meanwhile, electric current in the molten steel is acted with the rotary magnetic field to produce the electromagnetic force which then drives the molten steel to rotate. The invention has simple equipment, and has the obvious functions of improving the surface quality, the subsurface quality and the solidifying tissue of a casting blank and the isometric crystal ratio, and lightening the internal defects, such as the center segregation, the center looseness, and the like.
Owner:NORTHEASTERN UNIV
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