CN1316308A - Planar slip casting technology for making powder and its technological equipment - Google Patents
Planar slip casting technology for making powder and its technological equipment Download PDFInfo
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Abstract
A planar slip casting technology for preparing metallic powder and its equipment is disclosed. The equipment is composed of roller rotating system, displacement regulation system, heating system for molten metal, press head control system and atomizing chamber system. The molten metal heated by induction flows from crucible, passive through insulating hopper and nozzle to contact with the high-speed rotating roller. Under the action of rotating roller, it directly becomes molten metal drips, which then become fine metal powder after cooled. Its dvantages include simple technology, high roundness and output rate, and uniform granularity.
Description
The present invention relates to a kind of process unit of producing the technology of metal dust and implementing this technology.
At present, the process of producing metal dust has a lot, mainly contains physical-chemical process and Mechanical Method two big classes, and wherein physical-chemical process has condensation method, thermal decomposition method, reducing process, the precipitation method, displacement method, electrolysis, alloy decomposition method, organic solvent method etc.Mechanical Method mainly contains mechanical crushing method and the direct atomization of metal bath, the former adopts technology such as mechanical lapping, eddy milling, cold airflow pulverizing and centrifugal pulverizing, the latter is divided into two kinds of common atomization and rapid solidification atomizations again, wherein adopt fast solidification technology to cause in recent years that from the metal bath rapid solidification atomization that obtains metal dust that directly atomizes people pay close attention to greatly, obtained application more and more widely.Difference according to atomizing principles can be divided into the rapid solidification atomization method: I. double-current atomization, II. and centrifugal atomizing method, III. mechanical atomization method, IV. other atomization method.
The double fluid atomization mainly contains hydraulic atomized method, gases at high pressure atomization, ultrasonic gas atomization method, fast rotational agar diffusion method, they are to clash into molten metal bath stream fast with the fluid media (medium) with fair speed, thereby cause that liquid stream is broken, form the metal droplet, after cooling, obtain refining metallic powder.
The centrifugal atomizing method comprises rotation electrode atomization, rotating disc atomization, rotation agar diffusion method with holes and liquation extraction method, they are that molten metal bath is poured into the disk or cup of rotation from crucible or casting ladle, perhaps directly melt an end of rotating metallic bar, molten metal is fractured into droplet under the effect of rotary centrifugal force, is frozen into metal dust subsequently.
The rotation electrode atomization is that the circular fuel rod of sacrificial electrode rotates at a high speed along its long axis direction, and end stretches into spray chamber, by the arc-melting of tungsten electrode.Because rotation, molten metal bath stream diverges to droplet on tangential direction.Drop has the time enough nodularization before solidifying, thereby obtains smooth spherical powder.The particle size range of powder is 50～400 μ m, the about 200 μ m of average diameter.Therefore rotary electrode method is commonly used to produce the high-purity powder of reactive metal, as titanium, niobium, tantalum, vanadium and other metal dust because fusing is not carried out, and liquation extremely cleans in crucible.
The rotating disc atomization is used for producing multiple metal dusts such as aluminium, nickel, indium, aluminium molybdenum alloy, now produced more than 200 kind of quick solidifying high-temp alloy powder, it is that molten metal bath is poured in the spill disk atomizer of rotation with the bottom filling crucible, disc rotation speed reaches 35000 rev/mins, under centrifugal action, molten metal tangentially ejects the formation droplet, is subjected to the forced convertion cooling of high speed helium flow, drop rapid solidification powdered.The problem that fast setting rate method causes easily has the erosion that crucible lets slip a remark and the distortion of rotating circular disk, and especially problem is more outstanding when producing high temperature or reactive alloys powder.
It is after metal or alloy melts in electrical heating groove that liquation extracts ratio juris, by lifting device liquid level is contacted with the swiveling wheel wheel rim on top is stable, many breach are arranged on the wheel rim, thrown away by centrifugal force after the liquation that adheres to wheel rim stops certain hour, cooled and solidified into strips, thread or fibrous powder.There is not the problem of spray nozzle clogging in this technology, can be used to produce titanium, carbon steel, stainless steel and the high-speed steel powder of given shape, and the aspect ratio of gained powder depends on the distance of wheel rim breach.About 10～60 μ m of the diameter of powder, long 3～6mm.
The mechanical atomization method is with pure mechanical means molten metal to be broken into droplet, is rapidly solidificated into metal dust then, as vibrating electrode atomization, Duwez marksmanship, hammer anvil method, two roller atomization.Two roller atomizations are to make alloy melting in the crucible with high-frequency heating, feed argon gas after waiting to reach predetermined temperature, under argon pressure, molten alloy liquid is ejected into through leting slip a remark in two roller gaps of high-speed reverse rotation, liquation forms dull and stereotyped liquid stream during by roll gap, be atomized into drop subsequently, enter fast sloppy heat pond and be frozen into powder.Metal liquid stream is atomized into drop and is considered to owing to the cause that forms air pocket.In order to prevent that molten metal from solidifying in advance in roll gap, the thermal diffusion condition of running roller is controlled in necessary strictness, and general roll surface adopts heat proof material or is coated with one deck carbon at the metal roll surface, and the thermal conductivity factor of roll surface is reduced greatly.Formed powder particle is sheet, needle-like, irregularly shaped or ball shape.Two roller atomization process still are in the experimental study stage, can be used to produce metal dusts such as Al, Pb, Sn, also can be used to produce amorphous powder, as Ni
75Si
8B
17, Co
72.5Si
12.5B
15Deng.The powder process of two roller atomization has two principal characters, and the one, utilize two identical running rollers of high-speed reverse rotation to form dull and stereotyped liquid stream, metal roll surface carbon coating or employing heat proof material, another feature is to need fast sloppy heat pond.
Other rapid solidification atomization also has electrohydrodynamic atomization (EHDA), soluble gas atomization, electric spark etching technics, plasma atomization, using vaporization condensation process, emulsion process, dropper method etc.
China patent CN1051002A has developed the rapid solidification flour method that gas atomization and high speed rotating circular disk combine soon with fixed attention, and rotating circular disk is used for accelerating cooling velocity, plays further centrifugal atomizing and condensation.In addition, China has also reported the method for producing powder with the rotating vane quenching apparatus, and promptly the blade by at a high speed rotation hits liquid stream and pulverizes, and is frozen into alloy powder particle, cooling velocity reach 104 ℃/more than the s.
Chat in the rapid solidification atomization method in above-mentioned institute, most widely used with high pressure gas atomizing method and hydraulic atomized method, they are the main methods of producing metal dust.Rotation electrode atomization, rotating disc atomization, liquation extraction method etc. also progressively are applied to various metals of industrial production and alloy powder.But these milling methods are owing to the required energy of atomizing can not be controlled effectively, and the energy that is applied on the metal liquid stream is big more than molten metal atomizing energy needed, and the therefore powder size distribution broad of being produced, and powder shape is rounding not.Ultrasonic gas atomization method gained powder size is more concentrated, and the powder recovery rate surpasses 90%, but this powder by atomization method air consumption is big, and cost is higher.In recent years spray deposition technique development is rapid, and it unites two into one the atomizing and the deposition formation of metal bath, produces the clean nearly shape blank of larger-size rapid solidification but be mainly used in by liquid metals.
The planar flow casting technology that U.S. Pat 4142571 proposes is used to produce crystallite or amorphous thin ribbon, through the development of two more than ten years, generally obtains further investigation in countries in the world.All there are a tonne planar flow casting production line of producing amorphous band in the U.S., Germany, Japan and China.The process unit of planar flow casting technology is made up of three parts: running roller and motor driven systems, heating system, crucible and nozzle and navigation system thereof.The running roller material can be copper, copper beryllium alloy or medium carbon steel.Crucible is made of materials such as aluminium oxide, pottery or steel, is configured in the container with flat spiral cover.Elongated slits nozzle heat resisting steel, pottery, quartz or boron nitride manufacturing.Running roller is positioned under the nozzle, and running roller nozzle gap distance is less than 1mm.The planar flow casting technical process is: in a vacuum or carry out eddy-current heating fusing under the inert gas shielding, melt temperature is monitored by thermocouple.When reaching the predetermined degree of superheat, with the argon gas pressurization, liquation is sprayed through nozzle, contact formation molten metal weld pool in the running roller nozzle gap with the rotation running roller.Molten metal is rapidly solidificated into metal sheet band through running roller extraction, Quench in the weld pool.Because metal sheet band solidifies self and shrinks and the running roller centrifugal action, strip breaks away from the running roller rim faces automatically, obtains the strip product.
At the deficiency of rapid solidification flour method in the past, on the basis of conventional planar stream casting technology, we work out planar slip casting technology for making powder.
The objective of the invention is that traditional planar flow casting technology is carried out modification handles, make it no longer to form metal sheet band, but under running roller extraction effect, form plane liquid stream earlier, utilize surface tension unstability in the hydrodynamics to cause the broken principle of liquid stream then, plane liquid stream is broken into molten drop, finally obtains Size Distribution than the even metal powder-product.
The objective of the invention is to be achieved through the following technical solutions:
Planar flow casting powdered process unit involved in the present invention is made up of running roller rotary system, displacement regulating system, molten metal heating system, molten metal pressure head control system, spray chamber system.The running roller rotary system by frequency converter (13), variable-frequency motor (14), base, wipe wheel (11), small-power micro machine (15), running roller (2) and form.Variable-frequency motor (14) is installed on the base, and motor shaft directly connects with running roller (2), carries out infinitely variable speeds by frequency converter (13) pair roller wheel speed and regulates.Wipe wheel (11) and drive, stick to the lip-deep powder of running roller with removing by small-power micro machine (15).About the displacement regulating system can be carried out, about, the displacement of three different azimuth in front and back is regulated, wherein upper and lower displacement regulating system is by stepper motor (18), single-chip microcomputer pulse generation system (17), speed reducing gear pair (19), leading screw (21), nut (22) is formed, single-chip microcomputer pulse generation system (17) produces pulse control step motor (18), drive speed reducing gear pair (19) and leading screw (21) nut (22) transmission, nut (22) is moved up and down, and the hot funnel (5) that the lower end connects with nozzle (3) is fixed on the nut (22), thereby the upper and lower displacement that realizes nozzle (3) and running roller (2) surface spacing is regulated.Left and right displacement is identical with anteroposterior position transposition joint system architecture, all is by turning bolt (23), (25), upper and lower displacement regulating system (20) being moved on slide rail (24) realize.Left and right displacement is regulated and is used to change the spray to cast angle, and the anteroposterior position transposition is saved in making full use of whole running roller rim faces width.The molten metal heating system is divided two parts, and the one, by the alloy raw material in the Frequency Induction Heating fusion crucible (10), another is with high temperature resistance silk (4) heating, and molten metal bath in the hot funnel (5) is incubated with induction coil (9).Molten metal pressure head control system (6) is by electromagnet (26), switch (27), relay (28), power supply (29) and contact (31) are formed, when molten metal reaches predetermined temperature, with switch (27) closure, electromagnet (26) energising band magnetic, crucible bott stick (7) is lifted, molten metal flows in the hot funnel (5) from crucible (10), when molten metal liquid level (30) in the hot funnel and contact (31) when contacting, relay (28) disconnects, electromagnet (26) outage, crucible bott stick (7) is put down, and molten metal no longer flows in the hot funnel (5), thereby makes the molten metal pressure head keep stable.Spray chamber system (12) is made up of air inlet pipe, escape pipe, Pressure gauge, spray chamber casing, spray chamber flat cover, flange, peep hole glass, lighting lamp etc.
In the running roller rotary system, frequency converter (13) and small-power micro machine (15) are controlled by a ball bearing made using device (16), by this circuit arrangement, can control just commentaries on classics, counter-rotating, the start-stop of running roller (2), and by the frequency of frequency converter (13) running roller rotary speed as can be known.This circuit arrangement can also be controlled the start-stop of small-power micro machine (15), small-power micro machine (15) is driven wipe wheel (11) and running roller (2) coordination rotation.
In the upper and lower displacement regulating system, single-chip microcomputer pulse generation system (17) is a core with 8051 single-chip microcomputers, can produce continuous impulse, and the number of energy count pulse.Number according to pulse can calculate nozzle running roller spacing, and comes out with the LED instant playback.When 8051 SCM systems carry out the upper and lower displacement adjusting, at first need input nozzle running roller spacing initial value, and nozzle running roller spacing initial value is measured accurately in advance with slip gauge.
The planar flow casting powdered process unit that the present invention relates to can be produced Size Distribution than the even metal powder, and its design has several crucial parts:
One, at medium carbon steel running roller surface bonding polymer composite bed, reduce the thermal conductivity factor of roll surface, change the thermal diffusion condition of running roller.Molten metal bath and polymer bonding laminar surface will have suitable contact condition and wetting situation, and the heat exchange action between molten metal and the polymeric material is wanted suitably, if heat exchange action is excessive, because compound running roller heat transfer effect is big, then solidify in advance on the running roller surface, can not form plane liquid stream, can not get metal dust; If heat exchange action is too small, then the reduction of molten metal temperature is little, influences the setting time of broken drop, and then influences the spray chamber size.In planar flow casting powdered process unit, polymeric material adopts polytetrafluoroethylene ring, spreads viscose glue on medium carbon steel running roller surface earlier, then polytetrafluoroethylene ring is enclosed within on the running roller, be interference fit between polytetrafluoroethylene ring and running roller, more compound running roller finish turning become required size.
Two, accurately control main technologic parameters, as the molten metal hydrostatic head, nozzle running roller spacing.In conventional planar stream casting technical matters device, there is not hot funnel, nozzle directly is connected in crucible bottom molten metal exit.And for planar slip casting technology for making powder, the molten metal pressure head must be enough big, and just the height dimension of hot funnel (5) is suitable.The molten metal hydrostatic head must guarantee that molten metal can flow out to nozzle running roller gap from the rectangular slot nozzle and form the molten metal weld pool, and the molten metal pressure head is too big, the spray chamber size will be increased, the stability of mass flowrate and weld pool be will influence on the other hand, and then the size and the Size Distribution of powder influenced.It is adjustable controlled that nozzle running roller spacing is wanted.Compare with the nozzle running roller spacing in the casting of conventional planar stream, the nozzle running roller spacing in the planar slip casting technology for making powder is much smaller.In process unit of the present invention, drive the adjusting that the feed screw nut transmission is realized nozzle running roller spacing by the Single-chip Controlling stepper motor.Other technological parameter also needs to adjust control as spray to cast pressure, running roller speed, mass flowrate, jet size etc.
Three, increase the spray chamber structure, strict control atomizing atmosphere pressures.Conventional planar stream casting technology is produced metal sheet band and is directly carried out in atmosphere, need not airtight spray chamber.And in the present invention, increase the spray chamber structure, and spray chamber will have suitable atmosphere pressures.The spray chamber atmosphere pressures has a significant impact for the atomizing of plane liquid stream.If atmosphere pressures is excessive, will make the molten metal spray to cast be difficult for carrying out, and the increase of spray chamber pressurized, the realization difficulty of planar flow casting powdered technology is increased greatly; If atmosphere pressures is less, then plane liquid stream can not be broken, can only obtain the plane strip, can not get metal dust.For the alloy of a certain type, sometimes under certain conditions, spray chamber atmosphere pressures and atmospheric pressure are suitable, and this moment is spray chamber not, directly also can carry out powder process in atmosphere, is the metal dust broad particle distribution of being produced.
The present invention realizes by following process program:
The prealloy raw material is put into crucible (10) internal induction heat fused, while preheating insulation funnel (5), atomization gas is charged to and requires pressure.The temperature of molten alloy liquid is monitored with thermocouple (8), when being heated to the required degree of superheat, start the running roller rotary system earlier, make running roller (2) rotation at a high speed by stepless speed-change motor, wipe wheel (11) rotation by the small-power micro motor for driving simultaneously, closed then molten metal pressure head control system switch (27) lifts crucible bott stick (7), alloy liquid is flowed in the hot funnel (5) from crucible (10), contact with rotation running roller (2) through rectangular slot nozzle (3) again.Molten metal pressure head control system makes the molten metal pressure head keep stable.Running roller (2) rotation is at a high speed taken molten metal out of, directly forms molten drop, obtains refining metallic powder (1) after cooling off.
Main feature of the present invention is to utilize the outer peripheral face of single high speed rotation running roller to get rid of powder.By changing prealloy material composition, running roller outer surface composite material, spray chamber pressure (comprising directly in atmosphere), nozzle arrangements and size, roller speed and other process conditions and parameter, can produce multiple metal, alloy powder and other powder.
Than other rapid solidification flour technology, technological process of the present invention is simple, the capacity usage ratio height.The metal dust roundness of being produced is good, the Size Distribution frequency band is narrow, and structure property is good, and powder recovery rate height, can be widely used in industrial circles such as electric, electronics industry, printed wire, micro-scale technology, aircraft industry, powder metallurgy.
The process unit of the planar slip casting technology for making powder that the present invention relates to and this technology of enforcement can describe in detail with reference to the accompanying drawings:
Fig. 1 is a planar slip casting technology for making powder process unit schematic diagram.
Fig. 2 is a running roller rotary system schematic diagram.
Fig. 3 is a upper and lower displacement regulating system schematic diagram.
Fig. 4 is an all around displacement regulating system schematic diagram.
Fig. 5 is a molten metal pressure head control system schematic diagram.
Fig. 6 is that flow chart is regulated in 8051 SCM system upper and lower displacements.
Fig. 7 is the stereoscan photograph of the Sn60Pb40 alloy powder of experiment acquisition.
Embodiment:
By the left and right displacement regulating system, turn bolt, upper and lower displacement system (20) is moved on slide rail, regulate the position of nozzle (3) on running roller (2) rim faces width, make nozzle (3) be positioned at the centre position of running roller rim faces; By anteroposterior position transposition joint system, turn bolt, upper and lower displacement regulating system (20) and left and right displacement regulating system are moved on slide rail together, regulate the relative angle of nozzle (3) and running roller rim faces, make nozzle (3) perpendicular to the running roller rim faces.Measured nozzle running roller spacing initial value with slip gauge adjusting earlier.Then the spray chamber flat cover is covered airtight spray chamber (12).The prealloy composition is Sn60Pb40, will put into steel crucible (10) by the alloy raw material that alloy percentage becomes to distribute, and covers crucible cover, gives the Frequency Induction Heating system the logical power supply of going up, and inserts recirculated water.Connect resistance wire (4) heating system power supply simultaneously, hot funnel (5) and nozzle (3) are carried out preheating.Charge into nitrogen with nitrogen cylinder by spray chamber (12), by air gauge, spray chamber nitrogen is charged to requires pressure, with atmosphere oxygen content analyzer test spray chamber oxygen content, oxygen content needs less than 300ppm.With the temperature of thermocouple (8) measurement leypewter, when the temperature of fusion of lead ashbury metal liquid reaches 400 ℃ of left and right sides, start the running roller rotary system.By the switch in the circuit arrangement (16), connect frequency converter (13), making variable-frequency motor (14) drive compound running roller (2) is rotated in the forward, by adjusting the frequency of frequency converter (13), make roller speed reach pre-provisioning request, generally, connect small-power micro machine (15) then, drive and wipe wheel (11) rotation greater than 2700r/min.Compound running roller (2) is to spread viscose glue on medium carbon steel running roller surface earlier, then polytetrafluoroethylene ring is enclosed within on the running roller, and between polytetrafluoroethylene ring and running roller interference fit, more compound running roller finish turning is become required size.Frequency converter (13) model is ACS143-2K7-3, and variable-frequency motor (14) model is YTP802-2, and small-power micro machine (15) adopts the miniature threephase asynchronous of AO2-4524, power 16W, rotating speed 1400r/min.Then connect the switch (27) in the molten metal pressure head control system, electromagnet (26) energising band magnetic, crucible bott stick (7) is lifted, molten metal flows in the hot funnel (5) from crucible (10), when molten metal liquid level (30) in the hot funnel and contact (31) when contacting, relay (28) disconnects, electromagnet (26) outage, the crucible bott stick is put down, and molten metal no longer flows in the hot funnel.Make the molten metal pressure head keep constant by molten metal pressure head control system.Molten metal flows out from elongated slits nozzle (3) under the effect of molten metal hydrostatic head in the hot funnel (5), contacts with the running roller rim faces.Nozzle (3) is of a size of 12 * 0.5mm.Regulate the distance in nozzle (3) and running roller (2) gap by the upper and lower displacement regulating system, to import SCM system with the nozzle running roller spacing initial value that slip gauge records by the keyboard of 8031 SCM systems (17) earlier, import predetermined nozzle running roller distance values then, by SCM system software program control upper and lower displacement regulating system (20) nozzle running roller spacing is regulated, until reaching predetermined nozzle running roller spacing, in adjustment process, nozzle running roller distance values can be come out by diode displaying.Stepper motor (18) is the 75BF003 type, and the stepper motor driver model is DL-03F04.Nozzle running roller spacing initial value is beneficial to the obstruction that nozzle does not take place from nozzle (3) outflow molten metal bath about 1mm, predetermined nozzle running roller distance values is 0.04mm.Upper and lower displacement regulating system (20) feed speed that stepper motor (18) drives is each pulse 0.0033mm.The molten metal that flows out from elongated slits nozzle (3) forms a molten metal weld pool between the nozzle running roller, rotating running roller (2) at a high speed takes molten metal out of from weld pool, directly be broken into molten drop, the molten drop cooling of flying in spray chamber atmosphere is frozen into refining metallic powder (1).After treating that all molten metal spray to casts finish, stop the running roller rotary system, make compound running roller (2) and wipe wheel (11) to stop operating, close all power supplys of whole process unit then.At last metal dust (1) is collected out from the collection mouth of spray chamber (12), airtight preservation is stand-by.
Claims (3)
1. technology of utilizing planar flow casting powdered technology to produce metal dust is characterized in that:
The prealloy raw material is put into the crucible heat fused, while preheating insulation funnel, atomization gas is charged to and requires pressure.When molten alloy liquid is heated to the required degree of superheat, start stepless speed-change motor earlier, running roller is rotated at a high speed, lift the crucible bott stick then, alloy liquid is flowed in the hot funnel from crucible, contact with the rotation running roller through nozzle again.Because running roller outer surface cohesive polymers composite bed, it reduces the heat exchange action between alloy liquid and running roller greatly, thereby can as flowing the casting technology, conventional planar not produce metal sheet band, but under the extraction effect of rotation running roller, directly form molten drop, after cooling off, obtain refining metallic powder.
Wherein main feature is to utilize the outer peripheral face of single high speed rotation running roller to get rid of powder.
2. technology according to claim 1 prepares multiple metal, alloy powder and other powder, it is characterized in that:
By changing prealloy material composition, running roller outer surface composite material, spray chamber pressure (comprising directly in atmosphere), nozzle arrangements and size, roller speed and other process conditions and parameter, produce multiple metal, alloy powder and other powder.
3. process unit of implementing planar slip casting technology for making powder is characterized in that:
Form by running roller rotary system, displacement regulating system, molten metal heating system, molten metal pressure head control system, spray chamber system.The running roller rotary system by frequency converter (13), variable-frequency motor (14), base, wipe wheel (11), running roller (2), small-power micro machine (15) and form.Variable-frequency motor (14) is installed on the base, and motor shaft directly connects with running roller (2), carries out infinitely variable speeds by frequency converter (13) pair roller wheel speed and regulates.Wipe wheel (11) and drive, stick to the lip-deep powder of running roller with removing by small-power micro machine (15).About the displacement regulating system can be carried out, about, the displacement of three different azimuth in front and back is regulated, wherein upper and lower displacement regulating system is by stepper motor (18), single-chip microcomputer pulse generation system (17), speed reducing gear pair (19), leading screw (21), nut (22) is formed, single-chip microcomputer pulse generation system (17) produces pulse control step motor (18), drive speed reducing gear pair (19) and leading screw (21) nut (22) transmission, nut (22) is moved up and down, and the hot funnel (5) that the lower end connects with nozzle (3) is fixed on the nut (22), thereby the upper and lower displacement that realizes nozzle (3) and running roller (2) surface spacing is regulated.Left and right displacement is identical with anteroposterior position transposition joint system architecture, all is by turning bolt (23), (25), upper and lower displacement system (20) being moved on slide rail (24) realize.Left and right displacement is regulated and is used to change the spray to cast angle, and the anteroposterior position transposition is saved in making full use of whole running roller rim faces width.The molten metal heating system is divided two parts, and the one, by the alloy raw material in the Frequency Induction Heating fusion crucible (10), another is with high temperature resistance silk (4) heating, and molten metal bath in the hot funnel (5) is incubated with induction coil (9).Molten metal pressure head control system (6) is by electromagnet (26), switch (27), relay (28), power supply (29) and contact (31) are formed, when molten metal reaches predetermined temperature, with switch (27) closure, electromagnet (26) energising band magnetic, crucible bott stick (7) is lifted, molten metal flows in the hot funnel (5) from crucible (10), when molten metal liquid level (30) in the hot funnel and contact (31) when contacting, relay (27) disconnects, electromagnet (26) outage, the crucible bott stick is put down, and molten metal no longer flows in the hot funnel, thereby makes the molten metal pressure head stable.Spray chamber system (12) is made up of air inlet pipe, escape pipe, Pressure gauge, spray chamber casing, spray chamber flat cover, flange, peep hole glass, lighting lamp etc.
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| CN 01106197 CN1207122C (en) | 2001-02-26 | 2001-02-26 | Planar slip casting technology for making powder and its technological equipment |
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| CN102416472A (en) * | 2011-12-08 | 2012-04-18 | 沈阳工业大学 | Spray forming atomization device for applying static electricity to metal liquid and atomization method for device |
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| CN102416472A (en) * | 2011-12-08 | 2012-04-18 | 沈阳工业大学 | Spray forming atomization device for applying static electricity to metal liquid and atomization method for device |
| CN102416472B (en) * | 2011-12-08 | 2015-09-02 | 沈阳工业大学 | Reaction-injection moulding atomising device and the atomization method thereof of electrostatic is added in a kind of molten metal |
| CN102701248A (en) * | 2012-05-19 | 2012-10-03 | 鸿福晶体科技(安徽)有限公司 | Production process of high-purity aluminum oxide |
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