CN102641999A - Device and method for continuously preparing bulk amorphous alloy ingots - Google Patents
Device and method for continuously preparing bulk amorphous alloy ingots Download PDFInfo
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Abstract
The invention relates to a device and a method for continuously preparing bulk amorphous alloy ingots, which are characterized in that the preparation device comprises two vacuum chambers which are mutually independent. A main vacuum chamber is used for alloy melting and forming, and an auxiliary chamber is used for balancing pressure to facilitate throwing and secondary cooling. The primary cooling section of the preparation device and the method adopts a graphite pipe to be cast with a water cooling copper model embedding nest and is a main cooling part. The secondary cooling section adopts water cooling or natural cooling modes protected by inert gas and is an auxiliary cooling part. The device and the method have the advantages of having large cooling speed, meeting requirements of the bulk amorphous alloy ingots for formation, being simple in structure and capable of conveniently achieving metal continuous formation control and operation under vacuum inert gas atmosphere, and being strong in adaptability and capable of achieving continuous formation of ingots with various section shapes due to the fact that nesting cast with different inner cavity shapes and sizes, thereby being mainly suitable for continuous manufacture fields of the bulk amorphous alloy ingots.
Description
Technical field
The invention belongs to technical field of metal material preparation, the low-cost technology of preparing continuously of particularly a kind of bulk amorphous alloys and nonequilibrium freezing material.
Background technology
Non-crystaline amorphous metal is glassy metal again; Bulk amorphous alloys has the heat endurance higher than common non-crystaline amorphous metal; Do not solidify even crystallization does not also take place under the slow cooling velocity of 0.1～hundreds of K/s alloy melt; Thereby it is solid-state to make that amorphous liquid phase structure is frozen into, and its three-dimensional dimension can reach more than the millimeter level.Compare with crystalline metallic material; Bulk amorphous alloys has more excellent mechanics, physics, chemical property and precise forming characteristic, at Aero-Space device, precision optical machinery, information industry, give birth to body material, electronic product and field such as micro electronmechanical all demonstrates good prospects for application.
At present; Many new achievements in research have been obtained at the composition design field of bulk amorphous alloys; The glass forming ability that has been found that reaches nearly 20 of the alloy system of Centimeter Level, and wherein the glass of Zr base, bulk amorphous alloys such as Pd is basic, Pt is basic, Mg base forms critical dimension and surpassed 2 centimetres.Along with going deep into of research, the block non-crystalline alloy material that critical dimension is bigger is found gradually.The technology of preparing of bulk amorphous alloys mainly contains melt water quenching, permanent mold casting method, arc-melting casting, high pressure casting, powder compacting method etc.Comprise the powder compacting technology, mostly the method for preparing block non-crystalline alloy material is the non-continuous process of single-piece.Existing discontinuous technology of preparing can not satisfy the needs that block non-crystalline alloy material develops rapidly.The spin non-crystaline amorphous metal gauge or diameter of wire of method and motlten metal extracting method preparation of continuous preparation method of known non-crystaline amorphous metal such as rotating liquid is less, how below the millimeter level.Change the structural design of nozzle and chill roll, can realize the preparation of Fe sound stage width width of cloth amorphous thin ribbon, width can reach hundreds of millimeters, but thickness is below tens microns.It is the bulk amorphous alloys wire rod about 1mm that the rotating disc casting can prepare diameter continuously.Adopting continuously shaped method to prepare especially Centimeter Level block non-crystalline alloy material of millimeter, be not only the research direction that investigation of materials person pays close attention to, also is the active demand of satisfying commercial Application.The correlative study personnel have carried out preliminary discussion in this respect, and have proposed multiple different techniques scheme.
U.S. Pat 2006/0260782A1 has introduced a kind of continuous casing of bulk amorphous alloys sheet material; Adopt the casting speed of 0.5～10cm/s; Can prepare thickness and be 0.1～10mm slab; But cooling velocity is less than 10 ℃/s, and this method only is applicable to the Zr base large amorphous alloy moulding that contains Be with big glass forming ability.Publication number CN 1389317A has introduced a kind of vertical bulk amorphous alloys continuous casing; Molten metal liquid is dispersed into tiny stream thigh through a flow disperser that is located at the crucible bottom and falls, pours into casting mold, condensation formation amorphous, and adopts low-melting alloy to carry out the secondary cooling.Publication number CN 1486800A has introduced a kind of bulk amorphous alloys continuous casting rolling technology, and molten metal is through being injected into two continuous cooling formings of counterrotating water-cooled roll, but this method casting goes out bulk amorphous alloys sheet material, bar and special-shaped section bar.Publication number CN 1739886A has introduced a kind of hot-mold continuous cast unit of block amorphous alloy; This device adopts vertical D.C.casting mode; Alloy melt formed scope of freedom Quench moulding under the surface tension effects of heating graphite casting mould port of export molten metal, the ingot casting that solidifies pulls out graphite casting mould through haulage gear and realizes casting continuously the moulding process.Publication number CN101024243A has introduced a kind of hot-mold continuous cast method and apparatus for preparing bulk amorphous alloys, and this device adopts the horizontal continuous-casting mode, and crucible, water conservancy diversion and constant vessel, casting mold all use graphite material to make.Publication number CN101543885A has introduced the continuously shaped apparatus and method of a kind of block metal glass; This method adopts the dual-vacuum chamber of gas differential pressure; The composite mould that adopts heat insulation loop to connect heating graphite casting mould and water cooled copper mould is realized the non-crystaline amorphous metal continuous casting, and adopts gas as the secondary cooling medium.
Because physical characteristic and the characteristics of solidifying that are different from crystalline alloy that non-crystaline amorphous metal is unique with the technological preparing technical field that is applied directly to bulk amorphous alloys of continuous casting, can face many new problems.Mainly show the following aspects: 1. bulk amorphous alloys contains the chemical activity element more, and it is high to the degree of purity requirement of metal bath to form amorphous state, and the fusing of alloy and moulding generally need be carried out in vacuum or inert atmosphere; 2. the bulk amorphous alloys moulding needs big cooling velocity; And in the crystal alloy continuous casting process, a cold-zone (initial stage is solidified the position) main effect is formation initial stage solidified shell, makes metal forming that the cooling of strand mainly relies on the water spray of two cold-zones to cool off and accomplishes; And once cooling is long with the spacing distance of secondary cooling; Cooling velocity is low, adopts when using the same method the cooling non-crystaline amorphous metal, causes the strand generation crystallization of initial stage formation; 3. the non-crystaline amorphous metal process of setting does not produce the solidification shrinkage that phase transformation causes basically, and this makes the frictional resistance between strand and casting mold increase; 4. steam not only seriously reduces the vacuum of vacuum system, also can with alloy generation chemical reaction, reduce the glass forming ability of alloy.Have only to have solved these technical barriers effectively, could guarantee carrying out smoothly of the continuously shaped process of bulk amorphous alloys.
Summary of the invention
The objective of the invention is the problem that exists in the prior art for solving, a kind of continuous preparation device and method of bulk amorphous alloys ingot casting is provided.The big cooling velocity that this method utilizes nested casting mold to have can satisfy the cooling requirement of bulk amorphous alloys; Nested casting mold guarantees the smooth filling moulding of molten metal and pulling out smoothly of ingot casting; Come the pressure of balance main vacuum chamber through auxiliary vacuum chamber, carrying out the simple and effective control with the secondary cooling smoothly startup stage of realizing preparation continuously, realize the low-cost preparation continuously of bulk amorphous alloys ingot casting.
Technical solution of the present invention is following:
The continuous preparation device of bulk amorphous alloys ingot casting of the present invention comprises the main vacuum chamber and the auxilliary vacuum chamber that are interconnected, in main vacuum chamber, is provided with a fusion crucible and an insulation crucible; On auxilliary vacuum chamber, be provided with the equilibrium pressure gas valve; A nested casting mold that has a heater is fixedly mounted on the bottom of insulation crucible, and nested casting mold is made up of sleeve pipe, embedded pipe and water cooled copper mould, in the water cooled copper mould one end embedding sleeve pipe or with the coaxial arranged adjacent of sleeve pipe; In coaxial embedding sleeve pipe of embedded pipe and the water cooled copper mould; Sleeve pipe and water cooled copper mould are linked together, and water cooled copper mould stretches into the main vacuum chamber from auxilliary vacuum chamber, and its end is fixed with main vacuum chamber's wall; The sleeve pipe front end is fixed with the bottom of insulation crucible, and is communicated with the insulation crucible; Dummy bar head that has a shutoff circle link to each other with draw bar pass auxilliary vacuum chamber successively, nested casting mold gets into the insulation crucible that is arranged in main vacuum chamber and forms the dummy ingot device, on the ingot casting lead line, is provided with draw-gear.
The tube wall of pairing embedded pipe is provided with convexity between the axial distance of the water cooled copper mould port of nested casting mold and sleeve pipe, is enclosed with heat insulating mattress in raised position;
Said embedded pipe is a graphite-pipe;
The length of said nested casting mold middle sleeve is between 50～150mm, and wall thickness is between 5～25mm; Between the length 60～250mm of embedded pipe, wall thickness is between 1～5mm, between its raised position wall thickness 2～6mm; Water cooled copper mould length is between 50～200mm, and wall thickness is between 10～40mm;
The inner chamber cross section of nested casting mold is circular, square, rectangle or annular.
Described auxilliary vacuum chamber has guaranteed effective sealing of the nested casting mold of main vacuum chamber, also helps ingot casting is implemented the secondary cooling, and secondary cooling apparatus is positioned at outside the vacuum cavity of auxilliary vacuum chamber.Ingot casting can be opened auxilliary vacuum chamber lid after being pulled out nested casting mold, and charges into inert gas, and secondary cooling apparatus sprays secondary cooling water from the opening part of opening auxilliary vacuum chamber lid ingot casting is cooled off.
The dummy bar head front end of said dummy ingot device is placed with high temperature resistant shutoff circle, and the rear end links to each other with draw bar.Under the equalizing pressure effect of auxilliary vacuum chamber, both can guarantee to be incubated effective shutoff of crucible inner metal liquid, dummy bar head is drawn molten metal and is formed ingot casting and pull out smoothly in the time of can guaranteeing throwing again.
The continuous preparation method of a kind of bulk amorphous alloys of the present invention is characterized in that:
A, foundry alloy or alloying element are put into melting kettle according to proportioning; The dummy bar head that will have the shutoff circle is connected to and passes water cooled copper mould and the embedded pipe of graphite on the draw bar and extend in the insulation crucible; Open vacuum equipment vacuumizes main vacuum chamber and auxilliary vacuum chamber simultaneously; When vacuum reaches 10-1～10-3Pa; Close main vacuum valve and auxilliary vacuum valve, open main protection gas valve and the balance body valve of calming the anger, charge into the inert gas of 0.1～0.2Mpa pressure in main vacuum chamber and the auxilliary vacuum chamber;
Metal bath in b, the melting kettle is transferred in the insulation crucible; Temperature through crucible insulation apparatus control metal bath remains on and is higher than 50～100 ℃ of liquidus temperatures; Temperature through nested casting mold heater adjustment sleeve pipe front end is opened the cooling water valve of water cooled copper mould simultaneously for being higher than 20～80 ℃ of alloy liquid phase line temperature;
C, start draw-gear and produce throwing, stop and the motion of anti-push-model; Drive draw bar or ingot casting and (drive draw bar earlier; After ingot casting is pulled out certain-length, directly drive ingot casting) advance with the speed of 0.5mm/s～20mm/s; Metal bath flow through the successively hot junction (embed sleeve pipe one end) and cold junction (embedding water cooled copper mould one end) of embedded pipe, and be frozen into non-crystaline amorphous metal at the nested end of water cooled copper mould, be pulled device again and draw nested casting mold continuously;
After d, ingot casting are drawn out the auxilliary vacuum chamber of nested casting mold entering; Open auxilliary vacuum chamber lid again, apply inert protective gas ingot casting is protected, prevent the erosion of oxygen; And high temperature ingot casting water spray applied the secondary water-cooled to room temperature state; After ingot casting length reaches requirement, on the scale cutter sweep, carry out online cutting, obtain bulk amorphous alloys and prepare ingot casting continuously.
The guiding theory of technique scheme is:
1. the key of preparation non-crystaline amorphous metal is to make the non-crystaline amorphous metal melt under greater than the cooling velocity of critical cooling rate, carry out liquid-solid transformation.Fine copper and graphite all have higher pyroconductivity; And the pyroconductivity of fine copper is more than the several times of graphite; The casting in bronze type has bigger heat storage capacity and heat transfer coefficient; Be fit to the moulding of most amorphous alloys, can obtain favorable cooling effect, the repeatedly used casting in bronze type of many employings in the casting mold casting in the bulk amorphous alloys technology of preparing; The casting in bronze type is carried out water flowing cooling, can the heat that casting mold absorbs constantly be discharged to the outside, prevent that casting mold from heating up and influence the cooling of non-crystaline amorphous metal liquid; Graphite casting mould easy to wear be subject to water erosion, can not use repeatedly, cost is higher, is used through thin-walled graphite-pipe and the nested of water cooled copper mould, can effectively reduce cost and obtain to form non-crystaline amorphous metal required reach most intensity of cooling; Graphite and copper all have the favorable mechanical processing characteristics, can process bright and clean molded surface with reduce and forming metal between friction, graphite itself also has the solid lubrication characteristic, helps continuously shaped process; The embedded pipe of thin-walled graphite embeds in sleeve pipe and the copper mold, has both guaranteed the coaxial to the heart of nested casting mold, has guaranteed the needed big cooling velocity of preparation non-crystaline amorphous metal again; Through changing the inner wall shape and the size of casting mold, be convenient to realize different cutting and the material of shape and size continuously shaped.
2. preparation process continuously will start the slit that must guarantee between dummy bar head and the embedded pipe of thin-walled graphite smoothly by the infiltration molten metal and make dummy bar head stuck.The placement of dummy bar head and the success or not that control mode has directly determined continuous preparation process when the continuous casting under vacuum inert gas shielding condition starts.The suffered atmospheric pressure of shutoff circle of dummy bar head in the nested casting mold when coming balance main vacuum chamber chamber to vacuumize through auxilliary vacuum chamber; Come easily to realize of the sealing of the shutoff circle of refractory metal corrosion under the vacuum condition to deposite metal liquid; Prevent that effectively molten metal from infiltrating the slit between dummy bar head and the embedded pipe, avoids dummy bar head to be stuck.After continuous casting starts, can open auxilliary vacuum chamber lid in good time, under inert gas shielding, ingot casting applied secondary cooling water, and the melting and heat preservation and the liquid that can not have influence on metal bath in the main vacuum chamber fill type.
The invention has the beneficial effects as follows: this continuous preparation device is employed in the main vacuum chamber comes coaxial joint sleeve and water cooled copper mould with the embedded pipe of graphite thin-walled; And cooperate the effective sealing that realizes embedded pipe, sleeve pipe and water cooled copper mould through dimensional tolerance, in the auxilliary vacuum chamber that opens wide, formation ingot casting is applied secondary cooling water through inert gas shielding; A dummy bar head that has a shutoff circle links to each other with draw bar and passes nested casting mold and gets in the boron nitride crucible, and draw bar leans on a draw-gear to drive.The forming method of preparation adopts nested casting mold as once master's cooling continuously, adopts the water spray cooling under the inert gas shielding to cool off as secondary is auxiliary; Auxilliary vacuum chamber is mainly used in the equilibrium pressure that dummy bar head shutoff circle is provided and conveniently applies the secondary cooling.The nested casting mold of the apparatus and method of preparation moulding has bigger cooling velocity continuously, can satisfy the amorphous phase-change requirement that forms bulk amorphous alloys; Can conveniently apply the secondary cooling through opening auxilliary vacuum chamber lid, help improving the cooling velocity of non-crystaline amorphous metal and stablize formed non-crystaline amorphous metal ingot casting ingot casting; Through the embedded pipe of thin-walled graphite, in the water cooled copper mould built-in end cooling of light-wall pipe, it is few that sleeve pipe and water cooled copper mould are corroded by molten metal, long service life with liquid form for metal.Embedded pipe is changed convenient, and can realize excellent wire rod, sheet material, tubing and profile shapes continuously shaped of different cross section size.
Description of drawings
Fig. 1 is the horizontal continuous preparation device structural representation of bulk amorphous alloys ingot casting of the present invention;
Fig. 2 is the vertical continuous preparation facilities structural representation of bulk amorphous alloys ingot casting of the present invention;
Fig. 3 is the structural representation of nested casting mold of the horizontal continuous preparation device of bulk amorphous alloys ingot casting of the present invention;
Fig. 4 is the structural representation of nested casting mold of the vertical continuous preparation facilities of bulk amorphous alloys ingot casting of the present invention;
Fig. 5 is the structural representation of dummy ingot device of the horizontal continuous preparation device of bulk amorphous alloys ingot casting of the present invention;
Fig. 6 is the structural representation of dummy ingot device of the vertical continuous preparation facilities of bulk amorphous alloys ingot casting of the present invention;
Fig. 7 is the X-ray diffractogram of ingot casting sample among the embodiment 1.
Among the figure, 1. boron nitride insulation crucible, 2. crucible insulation apparatus, 3. nested casting mold heater, 4 sleeve pipes, 5. embedded pipe; 6. mat insulation, 7. water cooled copper mould, 8. metal bath, 9. ingot casting, 10. first thermocouple, 11. second thermocouples; 12. melting kettle, 13. main vacuum valves, 14. main pressure vacuum gauges, 15. main protection gas valves, 16. auxilliary pressure vacuum gauges, 17. auxilliary vacuum valves; 18. the equilibrium pressure gas valve, 19. water discharging valves, 20. draw-gears, 21. scale cutter sweeps, 22. cooling waters, 23. auxilliary vacuum chamber lids; 24. main vacuum chamber, 25. auxilliary vacuum chambers, 26. shutoff circles, 27. dummy bar heads, 28. draw bars.
The specific embodiment
The continuous preparation device of bulk amorphous alloys ingot casting of the present invention is drawn the difference of direction according to ingot casting, and can be divided into: horizontal continuous preparation device and vertical continuous preparation facilities provide embodiment respectively with regard to two kinds of devices below:
Embodiment 1: Fig. 1 is a kind of horizontal continuous preparation device of bulk amorphous alloys ingot casting.It comprises main vacuum chamber 24 and auxilliary vacuum chamber 25; Boron nitride insulation crucible 1 places in the main vacuum chamber, and 2 pairs of boron nitride insulations of crucible insulation apparatus crucible 1 is incubated, and second thermocouple 11 is used for measuring the temperature that boron nitride is incubated the metal bath 8 of crucible 1; The embedded pipe of sleeve pipe 4 in the nested casting mold, thin-walled graphite 5, heat insulating mattress 6 and water cooled copper mould 7 front ends also are positioned at main vacuum chamber; Sleeve pipe 4 and water cooled copper mould 7 coaxial arranged adjacent; And sleeve pipe 4 is connected with boron nitride insulation crucible 1, and heats through nested casting mold heater 3, and first thermocouple 10 is used to measure the temperature of nested casting mold middle sleeve 4 front ends; in coaxial embedding sleeve pipe 4 of the embedded pipe of thin-walled graphite and the water cooled copper mould 7, water cooled copper mould is installed on main vacuum chamber's wall through auxilliary vacuum chamber; When auxilliary vacuum chamber is used for balance and vacuumizes with dummy bar head 27 that draw bar 28 links to each other on the suffered atmospheric pressure of shutoff circle 26; Realize that refractory metal corrosion shutoff circle is to the sealing of metal bath 8 under the vacuum condition; Prevent that effectively molten metal from infiltrating the slit between dummy bar head 27 and the embedded pipe 5, avoids dummy bar head to be stuck; Throwing draw-gear 20 places outside the vacuum chamber, is used for drawing continuously draw bar 28 or ingot casting 9; Scale cutter sweep 21 places outside the vacuum chamber, and the ingot casting 9 of drawing is carried out online cutting; Main vacuum valve 13, main protection gas valve 15 and main pressure vacuum gauge 14 are used to control and measure atmosphere and the pressure in the main vacuum chamber; Auxilliary vacuum valve 17, equilibrium pressure gas valve 18 and auxilliary pressure vacuum gauge 16 are used to control and measure atmosphere and the pressure in the auxilliary vacuum chamber, the emission control of cooling water in cavity when auxilliary vacuum chamber water discharging valve 19 is used for preparation continuously and starts the auxilliary vacuum chamber lid in back and open after-applied secondary cooling.
Fig. 3 is the structural representation of the nested casting mold of horizontal continuous preparation device.The intracavity section shape of the nested casting mold that sleeve pipe 4, embedded pipe 5, heat insulating mattress 6 and water cooled copper mould 7 constitute can be circular, square, annular and other shapes etc., is convenient to realize the continuous preparation of excellent wire rod, sheet material, tubing and the profile shapes of different cross section size.Cooling water 22 is used to cool off water cooled copper mould 6.
Fig. 5 is the structural representation of horizontal continuous preparation device dummy ingot device.The shutoff circle 26 of refractory metal corrosion is positioned at dummy bar head 27 and stretches into metal bath 8 one ends, and dummy bar head 27 links to each other with draw bar 28.
The method that the continuous preparation device of above-mentioned bulk amorphous alloys ingot casting prepares is continuously used in introduction below, and the preparation diameter is the continuously shaped material of novel C u-Zr base large amorphous alloy of 10mm.
Step 1: the selection of alloy and foundry alloy preparation
Selection has the Zr-Cu-Al-Y alloy system of large-amorphous forming capacity, and alloy raw material is selected simple metal for use, and the purity of Cu and Al is greater than 99.999%, and the purity of Y is greater than 99.9%, and the purity of Zr is greater than 99.9%, and Zr handles through the electric arc remelting.By suitable atomic ratio configuration alloy raw material, molten alloy under vacuum arc furnace ignition is the uniformity that guarantees alloy, and foundry alloy stirs repeatedly, remelting is more than 5 times.The liquidus temperature that uses DTA to record alloy is 875 ℃, and the rate of heat addition during test is 20K/min.
Step 2: the continuous preparation moulding of bulk amorphous alloys ingot casting
The bulk amorphous alloys ingot casting continuous preparation device of using the present invention to propose, the length of graphite bush is 60mm, wall thickness is 13mm; The length of water cooled copper mould is 70mm, and wall thickness is about 23mm, and the length of the embedded pipe of graphite is 100mm; Wall thickness is 2mm, its salient position wall thickness 4mm.Foundry alloy is put into melting kettle 12, and the draw bar 28 that will have dummy bar head 27 and shutoff circle 26 extend in the boron nitride crucible with nested casting mold through auxilliary vacuum chamber, and open vacuum equipment vacuumizes main vacuum chamber and auxilliary vacuum chamber simultaneously, when vacuum reaches 10
-3During Pa, close main vacuum valve 13 and auxilliary vacuum valve 17, open main protection gas valve 15 and auxilliary equilibrium pressure gas valve 18, charged pressure is the high-purity argon gas of 0.1MPa in vacuum chamber; Open the power supply molten alloy of melting kettle 12, be transferred to boron nitride insulation crucible 1 behind the alloy melting, and the temperature of controlling melts through crucible insulation apparatus 2 is 970 ℃; The temperature of adjusting nested casting mold is 900 ℃, opens the cooling water valve of water cooled copper mould, and cooling water flow is 10L/min; Start draw-gear 20 and drive the draw bar motion, adopt and draw stop mode, its average casting speed is 1mm/s; Drawn casting mold continuously after being frozen into the chill casting ingot in the built-in end of the water cooled copper mould 7 of metal bath in the embedded pipe 5 of graphite; Open the lid 23 of auxilliary vacuum chamber, under the protection of argon gas, ingot casting further is cooled to room temperature under the secondary cooling water effect; The flow of secondary cooling water is 15L/min, obtains Centimeter Level diameter bulk amorphous alloys club-shaped material.
Step 3: tissue and phase structure evaluation
At the one section sample of middle part intercepting for preparing ingot casting continuously, after polishing, polish, corroding, use the observation by light microscope microscopic structure, measure the phase structure of sample with X-ray diffractometer.The micro-single-phase homogeneous tissue of sample; X-ray diffraction is general to be the big and wide steamed bun peak that typical non-crystaline amorphous metal has, and the diffraction maximum of corresponding crystal structure do not occur, as shown in Figure 7.Sample has the glass phase structure.
Embodiment 2: Fig. 2 is a kind of vertical continuous preparation facilities of bulk amorphous alloys ingot casting; Fig. 4 is the structural representation of the nested casting mold of vertical continuous preparation facilities; Fig. 6 is the structural representation of the dummy ingot device of vertical continuous preparation facilities.Can find out that from accompanying drawing the vertical continuous preparation facilities is all identical with principle, the structure of horizontal continuous preparation device; Different is: ingot casting is drawn the direction difference; Make nested casting mold be positioned at the below of vacuum chamber, its axis direction is a vertical direction, and an end of sleeve pipe links to each other with the bottom of insulation crucible; The other end and main vacuum chamber's wall are fixed, and water cooled copper mould one end embeds in the sleeve pipe.
Adopt the method for continuous preparation that the vertical continuous preparation facilities carries out the bulk amorphous alloys ingot casting with embodiment 1.
Claims (5)
1. the continuous preparation device of a bulk amorphous alloys ingot casting; Comprise the main vacuum chamber and the auxilliary vacuum chamber that are interconnected, in main vacuum chamber, be provided with a fusion crucible and an insulation crucible, it is characterized in that: on auxilliary vacuum chamber, be provided with the equilibrium pressure gas valve; A nested casting mold that has heater is fixedly mounted on the bottom that is incubated crucible; Nested casting mold is made up of sleeve pipe, embedded pipe and water cooled copper mould, water cooled copper mould one end embed in the sleeve pipe or with the coaxial arranged adjacent of sleeve pipe, in coaxial embedding sleeve pipe of embedded pipe and the water cooled copper mould; Sleeve pipe and water cooled copper mould are linked together; Water cooled copper mould stretches into from auxilliary vacuum chamber and terminally the main vacuum chamber fixes with main vacuum chamber's wall, and the sleeve pipe front end is fixed with the bottom of insulation crucible, and is communicated with the insulation crucible; Dummy bar head that has a shutoff circle link to each other with draw bar pass auxilliary vacuum chamber successively, nested casting mold gets into the insulation crucible that is arranged in main vacuum chamber and forms the dummy ingot device, on the ingot casting lead line, is provided with draw-gear.
2. the continuous preparation device of bulk amorphous alloys ingot casting according to claim 1 is characterized in that: the tube wall of pairing embedded pipe is provided with convexity between the axial distance of the water cooled copper mould port of nested casting mold and sleeve pipe, is enclosed with heat insulating mattress in raised position.
3. the continuous preparation device of bulk amorphous alloys ingot casting according to claim 2 is characterized in that: the length of said nested casting mold middle sleeve is between 50～150mm, and wall thickness is between 5～25mm; Between the length 60～250mm of embedded pipe, wall thickness is between 1～5mm, between its raised position wall thickness 2～6mm; Water cooled copper mould length is between 50～200mm, and wall thickness is between 10～40mm.
4. the continuous preparation device of bulk amorphous alloys ingot casting according to claim 3 is characterized in that: the inner chamber cross section of nested casting mold is circular, square, rectangle or annular.
5. the continuous preparation device of employing such as the described bulk amorphous alloys ingot casting of the arbitrary claim of claim 1～4 is carried out continuous preparation method, it is characterized in that:
A, foundry alloy or alloying element are put into melting kettle according to proportioning; The dummy bar head that will have the shutoff circle is connected to and passes water cooled copper mould and the embedded pipe of graphite on the draw bar and extend in the insulation crucible; Open vacuum equipment vacuumizes main vacuum chamber and auxilliary vacuum chamber simultaneously, when vacuum reaches 10
-1～10
-3During Pa, close main vacuum valve and auxilliary vacuum valve, open main protection gas valve and the balance body valve of calming the anger, charge into the inert gas of 0.1～0.2Mpa pressure in main vacuum chamber and the auxilliary vacuum chamber;
Metal bath in b, the melting kettle is transferred in the insulation crucible; Temperature through crucible insulation apparatus control metal bath remains on and is higher than 50～100 ℃ of liquidus temperatures; Temperature through nested casting mold heater adjustment sleeve pipe front end is opened the cooling water valve of water cooled copper mould simultaneously for being higher than 20～80 ℃ of alloy liquid phase line temperature;
C, start draw-gear and produce throwing, stop and the motion of anti-push-model; Driving draw bar or ingot casting advances with the speed of 0.5mm/s～20mm/s; Metal bath flow through the successively hot junction and the cold junction of embedded pipe; And be frozen into non-crystaline amorphous metal at the nested end of water cooled copper mould, be pulled device again and draw nested casting mold continuously;
After d, ingot casting are drawn out the auxilliary vacuum chamber of nested casting mold entering; Open auxilliary vacuum chamber lid again; Apply inert protective gas ingot casting is protected, and high temperature ingot casting water spray is applied the secondary water-cooled to room temperature state, after ingot casting length reaches requirement; On the scale cutter sweep, carry out online cutting, obtain bulk amorphous alloys and prepare ingot casting continuously.
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| CN108220670A (en) * | 2018-01-11 | 2018-06-29 | 中北大学 | A kind of Cu-Ni-Si-Mg alloy sheet strips casting-rolling method and casting and rolling installation |
| CN114226663A (en) * | 2020-09-09 | 2022-03-25 | 上海交通大学 | Casting device and casting method |
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