EP0357540A1 - Vorrichtung zum Zerstäuben von Metallschmelze - Google Patents

Vorrichtung zum Zerstäuben von Metallschmelze Download PDF

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Publication number
EP0357540A1
EP0357540A1 EP89730182A EP89730182A EP0357540A1 EP 0357540 A1 EP0357540 A1 EP 0357540A1 EP 89730182 A EP89730182 A EP 89730182A EP 89730182 A EP89730182 A EP 89730182A EP 0357540 A1 EP0357540 A1 EP 0357540A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
melt
spout
jet
gas
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Withdrawn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
EP89730182A
Other languages
German (de)
English (en)
French (fr)
Inventor
Franz Keutgen
Ulrich Dr. Urlau
Reinhard Dr. Scholz
Rudolf Dr. Jeschar
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.)
Vodafone GmbH
Original Assignee
Mannesmann AG
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 Mannesmann AG filed Critical Mannesmann AG
Publication of EP0357540A1 publication Critical patent/EP0357540A1/de
Withdrawn legal-status Critical Current

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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
    • 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
    • B22F2009/088—Fluid nozzles, e.g. angle, distance

Definitions

  • the invention relates to a device for atomizing molten metal in a system for producing metal objects by collecting the melt particles on a base.
  • Plants for the production of metal objects from atomized molten metal are known in principle, for example from DE-OS 20 43 882.
  • Such systems consist of a storage vessel with a spout for the molten metal arranged in the bottom.
  • a device for atomizing the melt is located below the storage vessel. This consists of an annular tube which has downward-pointing outlet openings which are inclined to the axis of the pouring jet for the supply of an atomizing gas, for example nitrogen, argon or another inert gas.
  • This device also referred to as a nozzle, is arranged coaxially with the spout. The metal jet flowing out of the spout flows through this nozzle and is atomized into fine particles by the gases.
  • the underlay can be a shape or a flat surface.
  • the pad is in a gas-tight chamber that is filled with protective gas.
  • the nozzle for atomizing the melt can be arranged both inside and outside this chamber filled with protective gas.
  • the reservoir is often interchangeable and is usually already filled with melt, placed above the nozzle and aligned with the spout so that the axes of the spout and nozzle are aligned. If the nozzle is inside the chamber, an opening in the wall for the passage of the melt is of course necessary.
  • the invention has for its object to eliminate the shortcomings described, to avoid approaches to the nozzle and to ensure an improvement in product quality.
  • a device for atomizing molten metal in a plant for the production of metal objects by collecting the melt particles on a base, with a storage vessel for the melt with a spout arranged in the bottom and at a distance below the bottom, surrounding the melt jet and lying coaxially to the spout , wherein the nozzle is provided with outlet openings for an atomizing gas, the axes of which are aligned such that they intersect the melt jet below the nozzle
  • a surface with a central opening for the melt passage is arranged opposite the melt entry side of the nozzle and the surface of the contour of the nozzle is adapted such that the free cross-sectional area formed by the distance of the nozzle from the surface extends from the outer edge of the nozzle to the underside the nozzle continuously decreased.
  • the invention is based on the knowledge that the gas streams causing the atomization of the molten metal jet aspirate air as "free jets" or suck in the existing inert gas in the chamber.
  • vortices occur between the gas jets and the melt jet, which loosen metal droplets from the melt jet above the geometric atomization point and transport them against the direction of flow of the metal. These droplets are deposited on the cold nozzle wall and cause caking there. This caking leads to further impairment of the flow conditions and, in extreme cases, to clogging of the free cross-sectional area of the nozzle.
  • the nozzle and the space above the nozzle and the spout of the storage vessel are considered and designed as a fluidic unit.
  • the surface arranged above the nozzle creates a flow space which, due to its continuous contour and its cross-sectional area which decreases from the outer edge of the nozzle to the lower edge of the nozzle, precludes the formation of vortices which impair atomization.
  • Continuous in the sense of the invention is understood to mean a smooth-walled course of the wall surface delimiting the flow channel.
  • the inner circumferential surface of the nozzle which surrounds the melt jet emerging from the spout at a distance, is preferably convex, in such a way that the clear cross-sectional area of the nozzle is reduced in the flow direction of the melt.
  • the surface opposite the melt entry side of the nozzle is formed by the bottom plate of the storage vessel. Moldings can be attached to the spout under the bottom of the storage vessel.
  • the outer wall of the spout can also be adapted to the shape of the surface by appropriate shaping. It is also advantageous if the lower edge of the spout extends into the clear cross section of the nozzle.
  • the area delimiting the flow channel can also be formed from the inside of a chamber wall receiving the atomizing nozzle.
  • the spout which is designed as a ceramic tube
  • the ring nozzle then has, in particular, bores directed parallel to the nozzle axis, which can be acted upon by gas.
  • Fig. 1 the bottom 2 of a storage vessel 1 is shown.
  • a tubular spout 3 made of refractory material is used, the lower edge of which extends into a nozzle 5 located at a distance below it.
  • the nozzle 5 is provided with outlet openings 6.
  • the axes 7 of the outlet openings 6 are inclined towards the melt jet 4 in such a way that they intersect it below the nozzle 5. Due to the gas flowing out of the outlet openings 6, the melt jet 4 is broken down into a droplet and collected on a base 15.
  • the surface 11 assigned to the melt inlet side 10 of the nozzle 5 is part of the base 2 of the storage vessel 1.
  • the surface 11 is adapted to the contour of the nozzle 5 such that the free cross-sectional area formed by the distance h of the nozzle 5 from the surface 11 is continuously reduced .
  • the outer surface 8 of the nozzle is convex. It extends from a plane 13 of the melt entry side to the lower edge 9 of the nozzle in such a way that the clear cross-sectional area F of the nozzle 5 is continuously reduced.
  • the lateral surface 8 runs smoothly in the surface of the nozzle on the melt inlet side 10. With 12 the outer edge (indicated by dashed lines) of the nozzle 5 is designated.
  • the pouring spout 3 extends from the casting vessel 1 to below the level 13.
  • the spout 3 is part of an annular nozzle 16 arranged in the bottom 2 of the vessel 1 with axially parallel bores 17.
  • the bores 17 can be acted upon by gas via a feed line 18.
  • the gas jets emerging therefrom bundle the melt jet 4 and also serve to set constant atomization conditions.
  • a further embodiment is shown schematically in cross section in FIG.
  • the storage vessel 1 is placed on the chamber 19 and the spout 3 is located in the surface 11 which is formed by an inner wall of the chamber 19.
  • the chamber 19 encloses the nozzle 5, the atomized melt jet (4 in FIG. 2) and the base 15 in a gas-tight manner.
  • Vortex formation in the metal supply area up to the atomization point is avoided. Baking of metal particles on the nozzle is prevented. The density of the metal objects produced is evened out.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Nozzles (AREA)
  • Coating By Spraying Or Casting (AREA)
EP89730182A 1988-08-30 1989-08-07 Vorrichtung zum Zerstäuben von Metallschmelze Withdrawn EP0357540A1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3829776 1988-08-30
DE3829776 1988-08-30
DE3839739A DE3839739C1 (enrdf_load_stackoverflow) 1988-08-30 1988-11-22
DE3839739 1988-11-22

Publications (1)

Publication Number Publication Date
EP0357540A1 true EP0357540A1 (de) 1990-03-07

Family

ID=25871760

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89730182A Withdrawn EP0357540A1 (de) 1988-08-30 1989-08-07 Vorrichtung zum Zerstäuben von Metallschmelze

Country Status (3)

Country Link
EP (1) EP0357540A1 (enrdf_load_stackoverflow)
JP (1) JPH02187161A (enrdf_load_stackoverflow)
DE (1) DE3839739C1 (enrdf_load_stackoverflow)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992001822A1 (en) * 1990-07-19 1992-02-06 Osprey Metals Limited Atomizing apparatus
GB2255572A (en) * 1991-05-01 1992-11-11 Rolls Royce Plc An apparatus for gas atomising a liquid
WO2005123311A1 (de) * 2004-06-17 2005-12-29 Imr-Metalle Und Technologie Gmbh Verfahren and vorrichtung zum zerstäuben von flüssigkeitsfilmen
EP4034320B1 (de) 2019-09-24 2023-07-19 Ald Vacuum Technologies GmbH Vorrichtung zur verdüsung eines schmelzstromes mittels eines gases

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4340102C2 (de) * 1993-11-22 1996-12-12 Mannesmann Ag Einrichtung zum Zerstäuben von Metallschmelzen, insbesondere zur Herstellung von Metallpulver oder Metallgegenständen
US5480097A (en) * 1994-03-25 1996-01-02 General Electric Company Gas atomizer with reduced backflow

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB638581A (en) * 1947-09-03 1950-06-14 Glacier Co Ltd Improvements in the manufacture of metallic powders
CH426439A (de) * 1961-09-30 1966-12-15 Polmetasa Polvos Metalicos S A Verfahren zur Herstellung von Metallpulvern
US3951577A (en) * 1973-02-09 1976-04-20 Hitachi, Ltd. Apparatus for production of metal powder according water atomizing method
EP0220418A1 (de) * 1985-09-24 1987-05-06 Gerking, Lüder, Dr.-Ing. Verfahren und Vorrichtung zum Herstellen von Feinstpulver in Kugelform

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT294334B (de) * 1969-09-09 1971-11-25 Voest Ag Verfahren zur Herstellung eines flaschen metallischen Gußproduktes und Anlage zur Durchführung des Verfahrens

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB638581A (en) * 1947-09-03 1950-06-14 Glacier Co Ltd Improvements in the manufacture of metallic powders
CH426439A (de) * 1961-09-30 1966-12-15 Polmetasa Polvos Metalicos S A Verfahren zur Herstellung von Metallpulvern
US3951577A (en) * 1973-02-09 1976-04-20 Hitachi, Ltd. Apparatus for production of metal powder according water atomizing method
EP0220418A1 (de) * 1985-09-24 1987-05-06 Gerking, Lüder, Dr.-Ing. Verfahren und Vorrichtung zum Herstellen von Feinstpulver in Kugelform

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN, Band 11, Nr. 380 (M-650)[2827], 11. Dezember 1987; & JP-A-62 151 503 (KOBE STEEL LTD) 06-07-1987 *
PATENT ABSTRACTS OF JAPAN, Band 6, Nr. 120 (M-140)[998], 3. Juli 1982; & JP-A-57 47 805 (TOYOTA JIDOSHA KOGYO K.K.) 18-03-1982 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1992001822A1 (en) * 1990-07-19 1992-02-06 Osprey Metals Limited Atomizing apparatus
GB2255572A (en) * 1991-05-01 1992-11-11 Rolls Royce Plc An apparatus for gas atomising a liquid
WO2005123311A1 (de) * 2004-06-17 2005-12-29 Imr-Metalle Und Technologie Gmbh Verfahren and vorrichtung zum zerstäuben von flüssigkeitsfilmen
EP4034320B1 (de) 2019-09-24 2023-07-19 Ald Vacuum Technologies GmbH Vorrichtung zur verdüsung eines schmelzstromes mittels eines gases
US12226833B2 (en) 2019-09-24 2025-02-18 Gfe Metalle Und Materialien Gmbh Device for atomizing a melt stream by means of a gas

Also Published As

Publication number Publication date
DE3839739C1 (enrdf_load_stackoverflow) 1989-10-05
JPH02187161A (ja) 1990-07-23

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