CN101885053A - Strong pulse current orientated solidification grain ultra-fining method and device - Google Patents
Strong pulse current orientated solidification grain ultra-fining method and device Download PDFInfo
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Abstract
The invention discloses a strong pulse current orientated solidification grain ultra-fining method and a strong pulse current orientated solidification grain ultra-fining device. The device comprises a heating controller, a drawing transmission mechanism, a supporting body, an orientated solidification furnace, a cantilever table, a fixing bracket and a pulse power source. The heating controller is connected with a resistance wire of the orientated solidification furnace through a lead and a thermocouple; the thermocouple is inserted into an inner wall of the orientated solidification furnace; and the power-on and power-off states by heating an electrically melt alundum tube in an inner ring of the orientated solidification furnace are adjusted in real time according to an inner temperature value of the orientated solidification furnace, which is measured and transmitted by the thermocouple in real time so as to fulfill the aim of controlling the internal temperature of the orientated solidification furnace. The pulse power source is connected with hot and cold end electrodes through leads, and the control of the pulse current is finished according to a electric pulse parameter regulating command. A cylindrical solidification structure with fine grain dimension and uniform orientation is obtained on the premise of simple and convenient equipment, effect is obvious, the harm of electromagnetic radiation can be reduced and the environmental burden is lightened.
Description
Technical field
The present invention relates to a kind of strong pulse current orientated solidification grain ultra-fining method and device thereof, belong to the rotten pulse processing field of directional solidification and electricity.
Background technology
The size of metal structure crystal grain and grain orientation have very big influence to the metal material mechanics performance.The method of grain refinement also has multiple.In conventional method, to improve cooling velocity and to increase degree of supercooling, cast cold, mechanical agitation etc. impel the technological effect of grain refinement limited, realize that difficulty is also bigger, and mechanical agitation intensity is involved in air and impurity when excessive easily and forms defectives such as shrinkage cavity, segregation in process of setting, influences the mechanical property of metal material greatly; Method of chemical treatment, be in molten metal, to add a small amount of special chemical element as alterant or inovulant, improve the growth of heterogeneous nucleation rate or inhibition crystal grain, in industrial production, be widely used at present, but cost height, complicated process of preparation, and in alloy or simple metal, added heterogeneously, tended to cause alloy solution to pollute or breed inefficacy.Utilize electric field force to cause the relative motion of liquid phase and solid phase, promote dendrite fragmentation that crystal grain is increased and come crystal grain thinning that this process can be good at realizing pollution-free crystal grain thinning owing to do not contact with metal material.Related data shows that the thin crystal technique of various electric fields, the thin crystal technique in magnetic field all can reach the purpose of thinning solidification structure crystal grain preferably.And existing pulse current grain refinement device just to motlten metal natural coagulation handle, in crystal grain thinning, can't obtain the tissue of grain orientation unanimity.
The method of a kind of refinement aluminium alloy and pure metallic aluminum solidified structure is disclosed respectively in Chinese patent 02137515.1 and 200410016842.2, all be in metal aluminium liquid cast cooled and solidified process, to apply pulse current to handle, difference is the difference of pulse frequency, pulse current peak, all can crystal grain thinning, mechanical property, electric conductivity, the processing performance of simple metal are improved.But this method is difficult to obtain the oriented freezing organization that crystal grain is tiny, crystal orientation is consistent.
Chinese patent 200710177552.X discloses metal material high-temperature processing method and device under a kind of resultant field.This method and apparatus applies coaxial pulsed magnetic field and superconducting intense magnetic field in the same way to metal bath, with control crystallite dimension and crystal orientation.Utilize superconducting intense magnetic field to suppress that stocks gravitational settling and free convection come guiding material to solidify along certain crystal orientation in the melt, utilize pulsed magnetic field to suppress Marangoni convection action in the melt, crystal grain thinning.This method is owing to need control grain orientation by superconducting intense magnetic field, and its device design is complicated, and production cost is also higher, and the superconducting intense magnetic field electromagnetic radiation is big, can cause certain pollution to working environment.
The present invention, applies Pulse Electric Current with High Density to metal bath and handles in metal directional solidification process in conjunction with directional solidification and the rotten pulse processing of electricity, control crystal grain radial dimension and acquisition directional columnargrain, its process route is simple, saves production cost, and has improved production efficiency.
Summary of the invention
In order to overcome in the prior art because device is complicated, production cost is higher, it is tiny to be difficult to obtain radial dimension, and the problems such as ultra-fine oriented freezing organization of grain growth direction unanimity the invention provides a kind of strong pulse current orientated solidification grain ultra-fining method and device thereof.
For solving the problems of the technologies described above, strong pulse current orientated solidification grain ultra-fining method of the present invention and device thereof are to be made of pulse current generating device and device for directionally solidifying two parts, pulse current generating device provides current impulse to motlten metal, constantly impact the grain structure in the growth, cause crystal grain tiny; Device for directionally solidifying produces the thermograde in the metal solidification process, obtains the solidified structure of grain growth direction unanimity.
Described pulse current generating device, belong to the capacitance energy storage high power pulsed source of compression energy in time, adopt the mode of discharge loop short circuit, by control system control charge and discharge switch, make storage power finish release in the short time, obtain high pulse current peak at the utmost point.
Described device for directionally solidifying, be made up of heating controller, pull transmission mechanism, cantilever platform, fixed support, water cooling plant and directional crystallization furnace: heating controller is measured and the feedback furnace body temperature in real time by thermocouple, realizes the automatic adjusting to furnace body temperature; The speed that moves both vertically of pull transmission mechanism control directional crystallization furnace; The cantilever platform connects pull transmission mechanism and fixed orientation crystal growing furnace.
Described fixed support is positioned at crystallographic orientation furnace shell below, is fixed on the level table, is independent of other device.Its upper end is provided with sample clamping mechanism, is used for fixing the cold junction electrode that holds corundum crucible.During use, the corundum crucible that holds the metal solution is nested on the cold junction electrode, and the shake of pull transmission mechanism is to the influence of its metal solution directional solidification grain structure orientation when having got rid of pull metal bar material in the past fully.
Water-cooling structure in the described device for directionally solidifying is made up of water collar, mistake tank piece and water inlet pipe, outlet pipe, is positioned at the bottom of directional crystallization furnace, and the centre is filled with heat-barrier material, to prevent that heat is to cooling jacket and body of heater conduction; Water-cooling structure is taken away unnecessary heat around the sample in order to the end of cooling corundum crucible, and bigger thermograde is provided.During use, by regulating the temperature and the flowing velocity of cooling water, and with the furnace body temperature of directional crystallization furnace, realize the big temperature difference of liquid metal alloy liquid-solid boundary, to satisfy the requirement of the temperature required gradient of experiment.
In order to solve in the metal solidification process, to apply strong current pulse to motlten metal simultaneously and realize that thin brilliant and big thermograde realizes directional solidification.Keep device for directionally solidifying constant during use, pulse current generating device just (is being born) utmost point by on the cold junction electrode of threaded terminal access in order to nested corundum crucible, negative (just) utmost point directly feeds in the motlten metal in the corundum crucible by a high temperature resistant electrode and realizes that short circuit connects, according to the electric pulse parameter regulating command, realize the control of paired pulses electric current in the directional solidification process.
Strong pulse current orientated solidification grain ultra-fining method of the present invention and device thereof are the combinations of directional solidification technique and the rotten pulse processing of electricity.In the directional solidification process, apply pulse current simultaneously, and commutative cold junction electrode and the hot junction electrode of being connected in the positive and negative two ends of the pulse power, all can reach thin brilliant purpose.The apparatus simple and flexible, save production cost, efficient improves greatly, make material in a heating process, can finish crystallite dimension and grain-oriented control simultaneously, reduce component segregation with fine little loose, help improving the serviceability of metal alloy, obtain the metal material that property requires.Can also reduce the injury of electromagnetic radiation, alleviate the burden of environment.Cold junction electrode holder of the present invention is held on the fixed support, and the shake of pull transmission mechanism is to the influence of metal bath directional solidification grain structure orientation when having got rid of pull metal bar material in the past fully.
Strong pulse current orientated solidification grain ultra-fining method of the present invention and device thereof comprise following implementation step:
1) pending metal material is a kind of or its alloy material among Al, Cu, Mg, Pb, the Sn;
2) at first ingot is poured into the bar-shaped of given size;
3) metal bar is positioned in the corundum crucible, and corundum crucible is installed is positioned at the directional crystallization furnace center, be warming up to above 50 ℃-150 ℃ of fusing point, melt fully and be incubated 20 minutes to metal;
4) set electric pulse parameter and connect the pulse power anodal with cold junction electrode, negative pole and hot junction electrode, drawing velocity in accordance with regulations carries out pull, while unbalanced pulse power supply carries out electric pulse directional solidification Combined Processing;
5) pull control system drawing velocity is: 10 μ m/s-400 μ m/s;
6) treat that pull finishes, close the pulse power, obtain the tiny directional columnargrain metal material of crystallite dimension.Wherein, the pulse current processing parameter is: pulse power electric capacity 30 μ F-120 μ F, the highest 3000V of peak impulse voltage, the highest 0.1MA level of pulse current peak, pulsed operation frequency 0.25Hz-2.5Hz.
Strong pulse current orientated solidification grain ultra-fining method of the present invention and device thereof are that existing pulse current treatment technology is combined as the technical application method with directional solidification technique, make material finish crystallite dimension and grain-oriented control simultaneously in a heating process.In the inventive method and device implementation process, metal bar is fixed in support, and the shake of pull transmission mechanism is to the influence of metal bath directional solidification grain structure orientation when getting rid of pull metal bar material in the past fully.Compare with the method for grain orientation control in conjunction with finishing crystallite dimension with superconducting intense magnetic field with taking pulsed magnetic field, equipment is simpler, and process route is simplified more, and saves production cost, and raises the efficiency; Aspect environmental protection, can also reduce the injury of electromagnetic radiation.In the inventive method and device implementation process, adopt the mode of discharge loop short circuit, make storage power in 500ns, finish release, can obtain high pulse current peak, improve the thermograde at solid liquid interface place, improve nucleation rate, thereby reach the purpose of crystal grain thinning.
Description of drawings
Below in conjunction with accompanying drawing strong pulse current orientated solidification grain ultra-fining method of the present invention and device thereof are described in further detail.
Fig. 1 is strong pulse current orientated solidification grain ultra-fining method of the present invention and apparatus structure schematic diagram thereof.
Fig. 2 be among the present invention the pull transmission mechanism along the cutaway view of A-A line.
Fig. 3 be among the present invention cantilever platform structure along the cutaway view of B-B line.
Fig. 4 is the schematic diagram of crystallographic orientation furnace structure among the present invention.
Fig. 5 is the fine aluminium directional solidification process metallographic structure figure that the present invention does not apply the flash current processing.
Fig. 6 is that the present invention applies pulse current peak 12.98KA, the fine aluminium directional solidification process metallographic structure figure when frequency is 1Hz.
Fig. 7 is that the present invention applies pulse current peak 25.66KA, the fine aluminium directional solidification process metallographic structure figure when frequency is 1Hz.
Fig. 8 is that the present invention applies pulse current peak 52.02KA, the fine aluminium directional solidification process metallographic structure figure when frequency is 1Hz.
Among the figure: 1. heating controller 2. direct current generators 3. pull transmission mechanisms 4. supporters 5. leading screws 6. water collars 7. directional crystallization furnaces 8. screw rods 9. long bolts 10. cantilever platforms 11. fixed supports 12. pulse powers 13. straight spur gears 14. worm and gears 15. cold junction electrodes 16. heat-barrier materials 17. insulation materials 18. outer heating wire 19. thermocouples 20. screwed pipes 21. hot junction electrodes 22. interior heating wire 23. refractory wass coatings 24. furnace body supports 25. water inlet pipes
The specific embodiment
Strong pulse current orientated solidification grain ultra-fining method of the present invention and device thereof are that the pulse current treatment technology is combined with directional solidification technique as the technical application method, metal bath is applied Pulse Electric Current with High Density handle, make metal material in a heating process, finish crystal grain radial dimension and acquisition directional columnargrain simultaneously.
As shown in Figure 1, use strong pulse current orientated solidification grain ultra-fining method of the present invention and device thereof, it is made of pulse current generating device and device for directionally solidifying.Described pulse current generating device is to provide current impulse to motlten metal, constantly impacts the grain structure in the growth, causes crystal grain tiny; Described device for directionally solidifying provides the thermograde in the metal solidification process, obtains the solidified structure of grain growth direction unanimity.Its structure mainly comprises pull transmission mechanism 3, supporter 4, cantilever platform 10, water collar 6, heat-barrier material 16, directional crystallization furnace 7 and fixed support 11, cold junction electrode 15, hot junction electrode 21, thermocouple 19, heating controller 1, the pulse power 12 parts composition.And keep hot junction electrode 21, directional crystallization furnace 7,15 threes are coaxial for the cold junction electrode.
Fig. 2 has showed that the pull transmission mechanism is along the cutaway view of A-A line in strong pulse current orientated solidification grain ultra-fining method of the present invention and the device thereof, and it adopts the deceleration principle of pull transmission mechanism.Described pull transmission mechanism 3 reduces the rotating speed of direct current generator 2 by straight spur gear 13 and worm and gear 14 double reduction transmissions, by leading screw 5 transmissions the rotation of worm gear is changed into the rectilinear motion of supporter 4 vertical direction again, the directional crystallization furnace 7 that drives on the cantilever platform 10 moves up and down, the speed that moves both vertically of control directional crystallization furnace 7, point-to-point speed is 10-1000 μ m/s;
Fig. 3 has provided in strong pulse current orientated solidification grain ultra-fining method of the present invention and the device thereof cantilever platform structure along the cutaway view of B-B line.The lower end of described cantilever platform (10) uses alignment pin to be connected with the end of supporter (4), can be fixed on the optional position, cantilever platform 10 upper ends are connected with furnace body support 24 by four long bolts 9, directional crystallization furnace 7 and be connected and fixed with water collar 6 usefulness screw rods 8, supporter 4, cantilever platform 10, water collar 6, furnace body support 24 and directional crystallization furnace 7 are become one, realize directly controlling the speed that moves both vertically of directional crystallization furnace 7 by pull transmission mechanism 3.Can wait the relative position of regulating between supporter 4, cantilever platform 10, water collar 6, furnace body support 24 and the directional crystallization furnace 7 to satisfy experimental requirements by the position of regulating alignment pin, the screwing length of long bolt 9 during use.
Be filled with heat-barrier material 16 between water collar 6 and the directional crystallization furnace 7, to avoid heat to the too much radiation of cooling jacket or to the support conduction, heat-barrier material is the cotton felt of high-alumina refractory fiber, can be 1000 ℃-1250 ℃ long-term down uses.For improving the axial-temperature gradient of electric pulse directional crystallization furnace 7, be provided with water collar 6 at bottom of furnace body, select for use heat conductivility preferably copper material as its main material.By regulating the temperature and the flowing velocity of cooling water in the water inlet pipe 25, and with the furnace body temperature of directional crystallization furnace 7, realize the big temperature difference of liquid metal alloy liquid-solid boundary, to satisfy the requirement of the temperature required gradient of experiment.During use, when workpiece is released burner hearth gradually under the effect of pull system, under the chilling action of water collar 6 and very fast cooling makes the solid-liquid plane of metal boost along the boiler tube axis.
With reference to figure 4, the directional crystallization furnace 7 in strong pulse current orientated solidification grain ultra-fining method of the present invention and the device thereof is a well formula hollow stove, is to utilize electric current to heat stove and accessory by the heat that resistive element produces.It adopts outer ring steady heating, and the mode of inner ring compensation heating guarantees the uniformity of fire box temperature field distribution, and body of heater is made of interior heating wire 22, outer heating wire 18, insulation material 17 and furnace wall.Select for use 0Cr25A115 as heating material, in air, be heated to the FeCrAl resistance wire about 500 ℃ and be incubated 4～5h, make material surface form protective layer of alumina gradually, to improve the service life of heating.Interior heating wire 22 is surrounded on the screwed pipe 20, and screwed pipe 20 materials are the electro-corundum pipe.Be shaped on thread groove on the furnace tube outer wall in advance, outer heating wire 18 coileds are put in the outer ring, play the reinforcement heat-insulating property, stablize the effect of furnace temperature.After winding heating wire, divide at furnace tube outer wall that to smear thickness for several times be refractory wass coating 23 about 5mm, and dry solidification, break away from thread groove to avoid heating wire temperature distortion at high temperature, cause adjacent heating wire contact and short circuit, can make heating wire and air insulated in addition, effectively alleviate the heating wire oxidation, improve service life.Corundum screwed pipe, horse are not fully tamped with aluminosilicate refractory fiber between courage and the furnace wall, guarantee the heat-insulating property that its directional crystallization furnace 7 is good.
The pulse power 12 belongs to the capacitance energy storage high power pulsed source of compression energy in time, adopt the mode of discharge loop short circuit, make storage power in 500ns, finish release, can obtain high pulse current peak, improve the thermograde at solid liquid interface place, improve nucleation rate, thereby reach the purpose of crystal grain thinning.Electric pulse parameter is: pulse power electric capacity 0-120 μ F, and crest value of impulse voltage is 3000V, pulsed operation frequency 0.25-2.5Hz, pulse peak current can reach the 0.1MA level.During use, the make pulse power supply, cold junction electrode 15 constitutes the closed-loop path with hot junction electrode 21 by the motlten metal in the corundum crucible, and keep motionless with fixed support 11, directional crystallization furnace 7, heat-barrier material 16, water collar 6 are positioned on the pull control system cantilever platform 10 as a whole, by the speed that moves both vertically of pull transmission mechanism 3 control directional crystallization furnaces, realize that motlten metal moves with respect to the orientation of directional crystallization furnace 7.According to the electric pulse parameter regulating command, the metal solution is applied current impulse simultaneously, finish the directional solidification and the grain refinement of test button.The utility model is controlled thin brilliant effect and the effect of control grain orientation simultaneously in conjunction with directional solidification technique and the rotten pulse processing of electricity in a process of setting of metal bath.Apparatus structure is simple, saves production cost, and raises the efficiency; Can also reduce the injury of electromagnetic radiation, alleviate the burden of environment.
Implement the oriented freezing organization preparation of thin brilliant fine aluminium under the flash electric current.The fine aluminium coupon is prepared: with purity is the commercial-purity aluminium of 99.7wt%, and the original aluminium bar that is cast into is of a size of Φ 7X100mm.Specific embodiment is as follows:
(1) fixedly mounts cold junction electrode and corundum crucible on support, and aluminium bar has been positioned in the corundum crucible, connected the anodal and cold junction electrode of the pulse power.
(2) the pull transmission mechanism makes the cantilever platform be in initial position, i.e. least significant end, and heat temperature raising, control system to be heated shows that fire box temperature is stabilized in 800 ℃ of insulations later on 20 minutes to fine aluminium and melts fully.
(3) the hot junction electrode is inserted in the motlten metal, and the hot junction electrode is connected negative pole by lead with the pulse power.
(4) configure electric pulse parameter: electric capacity 0-120 μ F, discharge voltage 0-600V, discharge frequency 0.25-2.5Hz, pulse peak current 0-52.02KA.
(5) open the pull transmission mechanism, begin to carry out pull with the speed of 10-2000 μ m/s, the unbalanced pulse power supply carries out electric pulse directional solidification Combined Processing simultaneously, finishes up to pull.
(6) break impulse power supply and pull transmission mechanism, heating controller power switch are promptly finished processing.
Can find out that from metallographic structure figure Fig. 5 is not for applying the fine aluminium oriented freezing organization of flash current processing, average grain size is 102.1 μ m; Fig. 6 is for applying pulse voltage 150V, and pulse current peak 12.98KA, the fine aluminium oriented freezing organization during frequency 1Hz, average grain size are 42 μ m; Fig. 7 is for applying pulse voltage 300V, and pulse current peak 25.66KA, the little oriented freezing organization of the fine aluminium of frequency 1Hz, average grain size are 34.1 μ m; Fig. 8 is for applying pulse voltage 600V, and pulse current peak 52.02KA, the fine aluminium oriented freezing organization when frequency is 1Hz, average grain size are 27.5 μ m.Can find after the contrast that after applying the flash current processing, with the increase of pulse current peak, fine aluminium oriented freezing organization crystal grain significantly reduces, and grain orientation continues to present uniformity.This shows that in the inventive method and device implementation process, the flash current processing put on can obtain under the prerequisite of simple equipments in the metal directional solidification process that crystallite dimension is tiny, the column-shaped solidification organization of orientation unanimity, effect is remarkable.
Claims (8)
1. strong pulse current orientated solidification grain ultra-fining method is characterized in that step is as follows:
1) pending metal material is a kind of or its alloy material among Al, Cu, Mg, Pb, the Sn;
2) at first ingot is poured into the bar-shaped of given size;
3) metal bar is positioned in the corundum crucible, and corundum crucible is installed is positioned at the directional crystallization furnace center, be warming up to above 50 ℃-150 ℃ of fusing point, melt fully and be incubated 20 minutes to metal;
4) set electric pulse parameter and connect the pulse power anodal with cold junction electrode, negative pole and hot junction electrode, drawing velocity in accordance with regulations carries out pull, while unbalanced pulse power supply carries out electric pulse directional solidification Combined Processing;
5) pull control system drawing velocity is: 1O μ m/s-400 μ m/s;
6) treat that pull finishes, close the pulse power, obtain the tiny directional columnargrain metal material of crystallite dimension.
2. flash current oriention coagulation system of realizing the described method of claim 1, comprise heating controller (1), direct current generator (2), pull transmission mechanism (3), supporter (4), water collar (6), directional crystallization furnace (7), cantilever platform (10), the fixed support (11) and the pulse power (12), it is characterized in that: described heating controller (1) is connected with directional crystallization furnace (7) resistance wire with thermocouple (19) by lead, thermocouple (19) inserts the inwall of directional crystallization furnace (7), directional crystallization furnace (7) furnace body temperature that measures according to thermocouple (19), and feed back to heating controller (1) control directional crystallization furnace (7) internal temperature.
3. flash current oriention coagulation system according to claim 2, it is characterized in that: the lower end of described cantilever platform (10) uses alignment pin to be connected with the end of supporter (4), can be fixed on the optional position, cantilever platform (10) upper end is connected with furnace body support (24) by four long bolts (9), directional crystallization furnace (7) is connected and fixed with screw rod (8) with water collar (6), and supporter (4), cantilever platform (10), water collar (6), furnace body support (24) and directional crystallization furnace (7) are become one.
4. flash current oriention coagulation system according to claim 2, it is characterized in that: described fixed support (11) is positioned at directional crystallization furnace (7) housing below, maintain a certain distance with cantilever platform (10) position, cold junction electrode (15) is fixed on fixed support (11) upper end by clamping device, hot junction electrode (21) is fixed on the cantilever shalving, corundum crucible is nested on the cold junction electrode (15), and keeps hot junction electrode (21), directional crystallization furnace (7), cold junction electrode (15) three coaxial.
5. flash current oriention coagulation system according to claim 2, it is characterized in that: described pull transmission mechanism (3) reduces the rotating speed of direct current generator (2) by straight spur gear (13) and worm and gear (14) double reduction transmission, by leading screw (5) transmission the rotation of worm gear is changed into the rectilinear motion of supporter (4) vertical direction again, the directional crystallization furnace (7) that drives on the cantilever platform (10) moves up and down, the speed that moves both vertically of control directional crystallization furnace (7), point-to-point speed is 10-1000 μ m/s.
6. flash current oriention coagulation system according to claim 2, it is characterized in that: described water collar (6) is arranged between the top of fixed support (11) and the directional crystallization furnace (7) and is filled with heat-barrier material (16), and heat-barrier material is the cotton felt of high-alumina refractory fiber; By the temperature of cooling water and the furnace body temperature of flowing velocity and directional crystallization furnace (7) in the adjusting water inlet pipe (25), realize the big temperature difference of liquid metal alloy liquid one liquid/solid interface.
7. flash current oriention coagulation system according to claim 2, it is characterized in that: described directional crystallization furnace (7), the outer ring is a not courage of horse, the inner ring burner hearth is the thermostable high-alumina earthenware, body of heater is by interior heating wire (22), outer heating wire (18), insulation material (17) and furnace wall constitute, interior heating wire (22) is surrounded on the screwed pipe (20), furnace tube outer wall is provided with thread groove, outer heating wire (18) coiled is put in the outer ring, after winding heating wire, at the furnace tube outer wall smearing thickness is the refractory wass coating (23) of 5mm, and dry solidification, the corundum screwed pipe, horse is not fully tamped with aluminosilicate refractory fiber between courage and the furnace wall, guarantees the heat-insulating property of directional crystallization furnace (7).
8. flash current oriention coagulation system according to claim 2, it is characterized in that: the described pulse power (12) provides the flash electric current to motlten metal, the positive and negative electrode of the pulse power (12) output connects with cold junction electrode (15) and hot junction electrode (21) respectively, constitutes closed discharge loop by the motlten metal in the corundum crucible; Cold junction electrode (15) lower end is provided with internal thread, the pulse power (12) just (bear) utmost point by the external screw thread terminal, screw by screw thread with cold junction electrode (15) and finish electrode and be connected.
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| CN102672146A (en) * | 2012-05-07 | 2012-09-19 | 上海交通大学 | Method for compositely refining solidification structure of magnesium alloy by combination of current and Zr |
| CN104133505A (en) * | 2014-07-21 | 2014-11-05 | 昆明理工大学 | Temperature control device for refining metal solidification structure by use of pulse current |
| CN104128592A (en) * | 2014-08-14 | 2014-11-05 | 昆明理工大学 | Device for refining metal solidification structure with electric current pulses |
| CN104694865A (en) * | 2015-03-03 | 2015-06-10 | 西北工业大学 | Electric pulse regression treatment method for aluminum alloy |
| CN109175315A (en) * | 2018-09-27 | 2019-01-11 | 太原科技大学 | A kind of preparation method of copper and iron immiscible alloy |
| CN110541088A (en) * | 2019-09-06 | 2019-12-06 | 北方民族大学 | Method for improving microstructure of Cu-Pb hypermonotectic alloy |
| CN112410631A (en) * | 2020-10-28 | 2021-02-26 | 西安航空学院 | Efficient single-phase Mg preparation2Method for preparing (Si, Sn) base medium temperature thermoelectric material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102672146A (en) * | 2012-05-07 | 2012-09-19 | 上海交通大学 | Method for compositely refining solidification structure of magnesium alloy by combination of current and Zr |
| CN104133505A (en) * | 2014-07-21 | 2014-11-05 | 昆明理工大学 | Temperature control device for refining metal solidification structure by use of pulse current |
| CN104128592A (en) * | 2014-08-14 | 2014-11-05 | 昆明理工大学 | Device for refining metal solidification structure with electric current pulses |
| CN104694865A (en) * | 2015-03-03 | 2015-06-10 | 西北工业大学 | Electric pulse regression treatment method for aluminum alloy |
| CN109175315A (en) * | 2018-09-27 | 2019-01-11 | 太原科技大学 | A kind of preparation method of copper and iron immiscible alloy |
| CN110541088A (en) * | 2019-09-06 | 2019-12-06 | 北方民族大学 | Method for improving microstructure of Cu-Pb hypermonotectic alloy |
| CN112410631A (en) * | 2020-10-28 | 2021-02-26 | 西安航空学院 | Efficient single-phase Mg preparation2Method for preparing (Si, Sn) base medium temperature thermoelectric material |
| CN115505768A (en) * | 2022-09-28 | 2022-12-23 | 中国科学院金属研究所 | Preparation method of Pb-based liquid-liquid phase-separated alloy in-situ particle composite material |
| CN115505768B (en) * | 2022-09-28 | 2024-03-01 | 中国科学院金属研究所 | Preparation method of Pb-based liquid-liquid phase-separated alloy in-situ particle composite material |
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