EP3297781A1 - Dispositif et procédé de pulvérisation de matières fondues - Google Patents

Dispositif et procédé de pulvérisation de matières fondues

Info

Publication number
EP3297781A1
EP3297781A1 EP16729178.0A EP16729178A EP3297781A1 EP 3297781 A1 EP3297781 A1 EP 3297781A1 EP 16729178 A EP16729178 A EP 16729178A EP 3297781 A1 EP3297781 A1 EP 3297781A1
Authority
EP
European Patent Office
Prior art keywords
flow
temperature
driving fluid
melt
outlet opening
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP16729178.0A
Other languages
German (de)
English (en)
Inventor
Humberto Chaves
Clemens KIRMSE
Hans-Peter Heller
Tobias Dubberstein
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Technische Universitaet Bergakademie Freiberg
Original Assignee
Technische Universitaet Bergakademie Freiberg
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Technische Universitaet Bergakademie Freiberg filed Critical Technische Universitaet Bergakademie Freiberg
Publication of EP3297781A1 publication Critical patent/EP3297781A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C23C4/123—Spraying molten metal
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0832—Handling of atomising fluid, e.g. heating, cooling, cleaning, recirculating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0888—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting construction of the melt process, apparatus, intermediate reservoir, e.g. tundish, devices for temperature control

Definitions

  • the invention relates to a device and a method for atomizing melts.
  • Powders serve as starting material in many fields of technology. With regard to the homogeneity of powders and the shape and size of particles contained therein, high quality requirements are imposed. In particular, technologies such as 3D printing or laser sintering require powders with particle diameters in the micrometer range, since the size of the particles
  • Processes for the production of powders are based primarily on the gas atomization of melts, wherein a gas stream with high flow velocity is directed onto a melt in such a way that particles are sheared off from the melt.
  • Various methods or devices of gas atomization of liquid metals and melts are known. These include, for example, the so-called free fall atomizer, in which a compact strand of a melt passes through an opening into an area in which nozzles are arranged spaced for a sputtering gas.
  • Another nebulizer called the Closed Coupled Atomizer, includes a plurality of gas nozzles positioned near a melt outlet port to achieve the desired melt slugging efficiency.
  • the procedure is such that a melt strand and the gas are passed through a Laval nozzle, wherein the
  • Gas is greatly accelerated compared to the melt. Due to the increased relative velocity between gas and melt, greater shear forces are achieved, which contribute to improved atomization.
  • the process of atomization can be divided into at least two stages.
  • the first relatively large particles drops, fragments
  • the relative velocity still present causes a further division of the products of the primary atomization by aerodynamic forces into even smaller particles.
  • the problem with the process described above is that the gas accelerated by means of a Laval nozzle cools very strongly in the expansion region. Since the working range of the primary and secondary atomization can preferably also be in this range, the products of the primary atomization abruptly cool and solidify before a secondary atomization to the desired extent has taken place.
  • the problem is solved by heating the melt above the melting temperature (overheating), which delays the solidification of the particles in the expansion area.
  • the resulting delay is not sufficient to achieve a satisfactory dispersion of the particles in the micrometer range.
  • the problem arises that the relatively high temperature difference in the expansion or working range leads to a rapid solidification of the surface of still molten particles inside.
  • EP 1 190 996 A2 Another solution is shown in EP 1 190 996 A2, which also deals with the problem of solidification of melts in the outlet region of Laval nozzles.
  • Proposed is a device for atomizing melts, in particular slag melts, in which the melt passes through an annular gap into a gas flow-through, designed as a Laval nozzle outlet opening.
  • a solidification of the melt in the region of the annular gap is counteracted in particular by setting a dip tube designed to convey the gas into rotation in the region of the annular gap.
  • a lance is arranged, via which the propellant gas is conveyed into the outlet opening.
  • the proposed solution requires an increased apparatus or design effort, which is considered to be disadvantageous in terms of the associated higher costs.
  • the solution described in EP 1 190 996 A2 like the solutions described in DE 10 2004 001 346 A1 and WO 02/04154 A1, requires the arrangement of the lance, via which the propellant gas is conveyed into the outlet opening, in a
  • the object is achieved with a device according to the features of the independent claim 1 and a method according to the features of the independent claim 11.
  • Advantageous embodiments and further developments of the invention can be realized with features described in the subordinate claims.
  • the inventively proposed device for atomizing melts comprises a crucible with at least one outlet opening, which has an at least partially diverging flow channel in the flow direction, and a flow channel driving fluid tube for conveying driving fluid into the outlet opening, wherein the driving fluid tube is arranged such that between the Lower edge and / or the outer periphery of themaschinefluidrohrs and the inner edge and / or the inner circumference of the outlet opening a gap opening for the passage of molten material is formed.
  • the device further comprises a heating device with which a quiescent temperature of the drive fluid can be adjusted and / or regulated such that a temperature change in the flow channel of the drive fluid tube and in the flow channel of the outlet port, in particular in the region of the diverging flow channel, can be compensated.
  • the outer walls of the drive fluid tube provided according to the invention can be in direct contact with the melt when the melt is in the crucible.
  • the temperature which the driving fluid has before leaving the heating device and entering the flow channel of the driving fluid tube or into the flow channel of the outlet opening is to be understood below.
  • the region of the flow channel with a divergent flow cross-section is referred to as an expansion region.
  • the advantage of the device according to the invention consists first of all in the fact that, due to the gap opening formed between the drive fluid tube and the outlet opening, the melt entering the outlet opening forms a thin melt film which ensures an enlarged shear surface with the fluid flow.
  • the shear rate is particularly high here, because on the wall of the divergent flow channel, the speed of the melt film is low or equal to zero and very high on the side facing the drive fluid. The shear rate is given by the quotient of the difference between these speeds and the thickness of the melt film.
  • the drive fluid tube and / or the crucible can be designed to be adjustable in height for adjusting a distance between the drive fluid tube and the crucible. This is necessary to ensure opening and closing of the gap opening and / or a change in the size of the gap opening. Accordingly, a lifting device can be provided, with which at least the driving fluid tube or crucible is adjustable in height so that the relative distance between the driving fluid tube and melting crucible is variable.
  • the opening of the gap opening is not achieved by a height adjustment of themaschinefluidrohrs or crucible, but by melting a arranged in the gap opening sealing ring having a melting temperature corresponding to the melting temperature of the melt or above the melting temperature of the melt lies.
  • the shape of the lower edge and / or the shape of the outer circumference of the drive fluid tube and the shape of the inner edge and / or the shape of the inner circumference of the outlet opening is formed such that when a height adjustment of themaschinefluidrohrs and / or the crucible, a fluid-tight Closing the gap opening is guaranteed.
  • the drive fluid tube and the outlet opening are arranged coaxially.
  • the shape of the lower edge and / or the shape of the outer circumference of the drive fluid tube and the shape of the inner edge and / or the shape of the inner circumference of the outlet opening are formed such that the gap formed by the distance betweenmaschinefluidrohr and outlet opening different Shapes preferably has a ring shape.
  • a further advantage is in particular in the heating device, with which the rest temperature of the driving fluid is adjustable and / or regulated so that a caused by an expansion of the fluid flow in the region of the divergent flow channel cooling of the fluid flow is compensated / compensated.
  • disadvantages known from the prior art such as the freezing or clogging of the outlet opening or of the annular gap can be reduced, without requiring additional heating or overheating of the melt in the region of the outlet opening.
  • a working region can be defined in the flow direction of the drive fluid at least in the region of the flow channel of the outlet opening, in which a predeterminable working temperature can be maintained.
  • this can define a region in which a favorable working temperature for the atomization of the melt is ensured.
  • different operating temperatures for example for different melts and / or atomization parameters (in terms of particle shape and particle size) can also be set.
  • the quiescent temperature can be controlled such that the working temperature in the working range not below 70% of the melting temperature of the melt, preferably at least 100% of the melting temperature of Melted, particularly preferably maintained at least 130% of the melting temperature of the melt.
  • the driving fluid tube is preferably arranged in the device according to the invention so that the main flow direction of the driving fluid is directed coaxially to the central axis of the outlet opening.
  • the mouth of the Examfluidrohrs is arranged in the flow direction of the driving fluid in front of the mouth of the outlet opening.
  • a flow channel of the Schwarzfluidrohrs in the mouth direction i. have a constant flow cross-section in the direction of the outlet opening.
  • a drive fluid flow channel formed from the drive fluid tube and the outlet opening may be designed in the form of a Laval nozzle, wherein the smallest flow cross section is formed in the region of the gap opening or at the mouth of the flow channel of the drive fluid tube.
  • the divergent part of the Laval nozzle need not be located in the crucible, but the diverging flow channel may be formed in a discharge stone, which is connected at the outlet opening interchangeable with the crucible.
  • the outlet brick is preferably connected to the crucible with a correspondingly temperature-stable adhesive or kit.
  • Auslaufsteine having different slopes or geometries of the diverging flow channel.
  • nozzles with different properties can be provided.
  • the manufacturing technology complex geometry of a flow channel does not have to be formed in the crucible, but is provided in the form of a reusable Auslaufsteine. Due to the shape of the flow channels, particularly high flow velocities for the driving fluid can be achieved, which contributes to an increase in the relative velocity between the melt and the driving fluid. The increased shear effect has a positive effect on the primary and secondary from secondary atomization and contributes to the formation of very small particle sizes.
  • At least one further outlet opening for a further fluid flow is provided in the inner wall of the outlet opening, at the mouth of the outlet opening and / or in the crucible, which at least partially flows through the driving fluid flow and / or the working area in its spatial extent limited.
  • the already mentioned heating device can be formed with an electrical resistance heater, with a plasma torch and / or with a chemical burner.
  • a protective gas atmosphere may be required. Accordingly, means for providing a protective gas atmosphere may be provided. Conceivable is a realization by inert gas flows in desired areas.
  • the device according to the invention can also be arranged in a container or surrounded by an enclosure, in which a protective gas atmosphere, for example. Provided with argon.
  • All components of the device according to the invention which come into contact with the melt or with the heated blowing fluid flow, are formed from a temperature-resistant material, preferably a ceramic, or have a suitably temperature-resistant coating.
  • the procedure is such that molten material which passes through a gap opening into a flow channel of an outlet opening through which fluid flows - which may preferably have a flow cross section which at least partially diverges in the direction of flow - contacts the driving fluid flow along the inner wall of the Flow channel is accelerated, with a Temperature change of the driving fluid flow is compensated for at least in the flow channel of the outlet opening by adjusting a quiescent temperature of the driving fluid.
  • the melt which may be a metallic or non-metallic material, should at least be brought to a temperature at which sufficient flowability is ensured.
  • the melt flows not as a compact strand, but as a thin film along the inner wall of the flow channel of the outlet opening, wherein the melt film on the contact side with themaschinefluidstrom against the wall side is greatly accelerated, which facilitates the shear of the melt film and favors the primary atomization.
  • the quiescent temperature is increased with the heater so far that caused by the expansion of graspfluidstroms temperature reduction in the flow channel of graspfluid raw rs and especially in the expansion region in the further flow, in which preferably the primary atomization of the melt can take place, adjusted or compensated for a predetermined temperature can be.
  • the quiescent temperature is kept substantially above the melting temperature of the melt. In this way, the solidification of formed particles can be delayed in regions, in order to bring about the desired sputtering success, in particular in the area of secondary atomization (in terms of particle shape and / or particle size).
  • An influence on the atomization process can be adjusted and / or regulated by a change in the quiescent temperature of the drive fluid. It is particularly favorable if the propellant fluid at rest above the
  • Melting temperature of the melt is heated to keep a temperature drop below a predetermined operating temperature in the expansion range low. Accordingly, the quiescent temperature can be adjusted and / or regulated that in the working range a working temperature can be maintained, which is not below 70% of the melting temperature of the melt, preferably at least 100% corresponds to the melting temperature of the melt, more preferably at least 130% corresponds to the melting temperature of the melt. In this case, physical and / or chemical properties of different melts should be taken into account in order to ensure the desired sputtering success.
  • temperature monitoring may be performed at various positions along the flow path of the motive fluid stream, providing temperature information to the heater.
  • the driving fluid in the region of the annular gap and / or in the region of the outlet opening in the flow channel can be accelerated to 50% of the speed of sound.
  • the flow rate of the motive fluid can also be accelerated to the speed of sound, most preferably to 200% sonic velocity.
  • the flow velocity of the driving fluid can be varied as an influencing variable of the atomization process. If there is sound velocity in the region of the annular gap, the flow parameters in the flow channel of the driving fluid tube are defined by known gas-dynamic relationships.
  • the working area may extend from the gap opening in the flow direction of the driving fluid flow.
  • the working range of at least one further fluid flow, which flows through the driving fluid flow at least in regions can be limited and / or influenced. This makes it possible to set the boundaries of a workspace.
  • the at least one further fluid stream may have a temperature and / or flow velocity which is unequal to the flow of the blowing fluid.
  • a limitation of the working range can preferably be achieved with a further fluid flow having a lower temperature than the driving fluid flow.
  • Not belonging to the work area are understood areas in which the desired working temperature can not be met. Such areas may be formed as defined cooling areas for cooling the particles.
  • the quiescent temperature can be regulated as a function of the flow velocity of the drive fluid at the gap opening and / or as a function of the flow velocity of the drive fluid in the expansion region.
  • a driving fluid is understood as gas or vapor.
  • the driving fluid used is mono- and / or polyatomic gases and / or vapors.
  • FIG. 1 shows a schematic representation of an exemplary embodiment of the device according to the invention.
  • the device for atomizing melts, which has a crucible 1 with at least one outlet opening 2.1.
  • the outlet opening 2.1 has a flow channel 10.2 with a diverging flow cross-section.
  • the flow channel 10.2 is located centrally within a discharge block 17, which is cemented with a cement attached to the outlet opening 2.1 at the crucible 1.
  • the device comprises a drive fluid tube 4 with flow channel 10.1 for conveying propellant fluid into the outlet opening 2.1.
  • the drive fluid pipe 4 is arranged such that between the outer circumference of the drive fluid pipe 4 tapering in the direction of flow 3 or in the direction of the opening and the inner circumference of the outlet opening 2. 1 5 gap is formed to the flow of melt 6 in the outlet 2.1.
  • the drive fluid tube 4 is set up in a height-adjustable manner, so that the size of the annular gap 5 can be varied by means of the lifting device 18 in the direction of the arrow 18.1.
  • Reference number 7 shows a heating device connected to the drive fluid tube 4, with which a quiescent temperature of the drive fluid supplied via an inlet opening 8 can be adjusted and / or regulated such that a temperature change of the motive fluid flow 3.1 at least in the flow channel 10.2, i. in the expansion region, in which the flow channel 10.2 between the mouth of the outlet opening 2.1 and the mouth of the outlet opening 2.2 has a diverging course, can be compensated.
  • the data acquisition required for regulating the quiescent temperature takes place by means of temperature sensors (not shown) which can be arranged in the region of the flow channels 10.1 and 10.2 and in the flow direction 3 behind the mouths of the outlet openings 2.1 and / or 2.2 or directed towards these areas.
  • the heating device 7 may be formed with an electrical resistance heater, a plasma torch and / or a chemical burner, depending on the type of drive fluid, which rest temperature and / or which melt are used.
  • the flow channel 10. 1 has a flow cross section that is constant in the flow direction 3.
  • the flow channel has a converging flow cross-section.
  • the flow channels 10.1 and 10.2 form a common flow channel for driving fluid in the form of a Laval nozzle, the smallest flow cross section at the Mouth ofmaschineth ofmaschineth ofmaschineth ofmaschineth ofmaschineth ofmaschineth ofmaschineth ofmaschineth.
  • two further flow channels 11 for fluid flows 11.1 are formed in the region of the outlet of the outlet block 17 by the arrangements 16 (cooling device), the openings 12 of the flow channels 11 being directed toward the mouth region of the outlet opening 2.2 in order to influence the driving fluid flow 3.1.
  • the arrangement of the orifices 12 makes it possible, with a suitable flow velocity, for a crossing 9 of the fluid flows 11.1 in the region of the driving fluid flow 3.1. This makes it possible, the Examfluidstrom 3.1 in one for the primary and
  • Secondary atomization favorable work area A (hatched shown) limit.
  • the working region A is formed between the outlet opening 2.1 and the intersection 9 of the fluid streams 11.1.
  • temperature sensors (not shown) are directed at the working area A or arranged there in order to ensure a data acquisition of the heating device 7 required for the quiescent temperature control.
  • a fusible material is melted by supplying energy in the crucible 1.
  • a sufficient supply of energy should be provided, so that the melt 6 reaches a suitable flowability to reach after lifting the Examfluidrohrs 4 through the thus opened annular gap 5 in the flow from the drive fluid flow 3.1 3.1 outlet.
  • the driving fluid flow 3.1 has a speed of sound, so that the incoming melting material 6 is accelerated as a result of the driving fluid flow 3.1.
  • aerodynamic forces that urge the melt to the inner wall of the flow channel 10.2 act. It forms a thin film or a thin layer of
  • the wall side has a significantly lower flow velocity.
  • the difference in flow-side flow velocity causes shear stresses within the melt film which tend to break the melt film and thereby induce primary atomization.
  • the primary atomization of the melt can already begin immediately after entry into the outlet opening 2.1, whereby drops 13 of the melt 6 are entrained with the blowing fluid stream 3.1.
  • the first Mach joints 14 are indicated, which cause a further division (secondary atomization) of formed droplets. Mach's shocks are unsteady pressure, density and velocity changes when transitioning from supersonic to subsonic flow.
  • the temperature change in the cooling and mixing region 15 leads to the solidification of the particles formed.
  • the secondary atomization is interrupted and limited in the present case, the work area.
  • a compensation of the temperature change caused in the flow channel 10.2 due to the expansion of themaschinefluidstroms 3.1 below a favorable for the primary and / or Sekundärzerstäubung working temperature is done by regulating or increasing the rest temperature of the driving fluid to the heater 7.
  • the regulation of the rest temperature based on Temperature sensors are made or preset, if appropriate tabular values are available.
  • the following table shows an example of a presetting of the temperature T 0 by means of the heating device 7 in order to obtain a temperature equal to the melting temperature T s at the outlet opening 2.1 in the expansion region of the motive fluid stream 3.1 at a flow velocity of the motive fluid.
  • the compensation is based on the relationship:
  • T 0 (1 + (kl) / 2) T s
  • k the adiabatic exponent
  • T 0 the quiescent temperature
  • T s the temperature at the speed of sound of the motive fluid.
  • Table 1 above illustrates the relationship between the required quiescent temperature of the motive fluid and the melting temperature (in degrees Kelvin), depending on the type of motive fluid used for primary atomization.
  • the melt is heated above its melting temperature. In this case, less energy needs to be expended for the temperature adjustments in the expansion area. It may be sufficient if the quiescent temperature is set below the melting temperature of the melted material 6. It should be noted that the risk of freezing increases with decreasing fluid temperature. This may require an adjustment of the size of the annular gap 5.
  • a working region A is defined as a function of the driving fluid and melt 6, in which particularly favorable conditions for the primary and secondary atomization of the melt can be provided.
  • the quiescent temperature is adjusted so that the working temperature in the working area A, which can be located according to Figure 1 between the outlet port 2.1 and the intersection 9 of the fluid streams 11.1, not below.
  • the working temperature is set above the melting temperature of the melt.
  • different quiescent temperatures may be required for the temperature adjustment or temperature compensation.
  • the energy required to melt tin or copper can be provided by means of resistance heating. For melting of ceramic materials higher temperatures are required, which can be achieved for example with a plasma torch. In this case, it makes sense to overheat the melt before entering the outlet opening 2.1.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Nozzles (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

L'invention concerne un dispositif et un procédé de pulvérisation de matières fondues. Une matière fondue (6) pénétrant par une ouverture en fente (5) dans une ouverture de sortie (2.1) traversée par du fluide propulseur est cisaillée lors du contact avec le flux de fluide propulseur (3.1) le long de la paroi intérieure du canal d'écoulement (10.2). Dans une zone d'expansion du flux de fluide propulseur (3.1), située derrière l'ouverture en fente (5) dans le sens d'écoulement (3), une réduction de température du flux de fluide propulseur (3.1) est compensée par une augmentation de la température de repos du fluide propulseur.
EP16729178.0A 2015-05-19 2016-05-18 Dispositif et procédé de pulvérisation de matières fondues Withdrawn EP3297781A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015107876.7A DE102015107876A1 (de) 2015-05-19 2015-05-19 Vorrichtung und Verfahren zum Zerstäuben von Schmelzen
PCT/DE2016/100228 WO2016184455A1 (fr) 2015-05-19 2016-05-18 Dispositif et procédé de pulvérisation de matières fondues

Publications (1)

Publication Number Publication Date
EP3297781A1 true EP3297781A1 (fr) 2018-03-28

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EP16729178.0A Withdrawn EP3297781A1 (fr) 2015-05-19 2016-05-18 Dispositif et procédé de pulvérisation de matières fondues

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EP (1) EP3297781A1 (fr)
DE (1) DE102015107876A1 (fr)
WO (1) WO2016184455A1 (fr)

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CN109382231B (zh) * 2018-10-25 2020-08-25 辽宁工程技术大学 一种探针式超音速气动雾化喷嘴
CN110125424B (zh) * 2019-06-14 2021-06-04 上海交通大学 等轴晶铝合金的声波雾化装置及方法
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