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EP1658150A1 - Dispositif pour atomiser un jet de matiere fondue et procede pour atomiser des metaux ou des ceramiques refractaires - Google Patents

Dispositif pour atomiser un jet de matiere fondue et procede pour atomiser des metaux ou des ceramiques refractaires

Info

Publication number
EP1658150A1
EP1658150A1 EP04764728A EP04764728A EP1658150A1 EP 1658150 A1 EP1658150 A1 EP 1658150A1 EP 04764728 A EP04764728 A EP 04764728A EP 04764728 A EP04764728 A EP 04764728A EP 1658150 A1 EP1658150 A1 EP 1658150A1
Authority
EP
European Patent Office
Prior art keywords
melt
nozzle
gas flow
lavalduse
melt nozzle
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Withdrawn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
EP04764728A
Other languages
German (de)
English (en)
Inventor
Lüder Dr.-Ing. Gerking
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1658150A1 publication Critical patent/EP1658150A1/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Withdrawn legal-status Critical Current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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J2/00—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic
    • B01J2/02—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops
    • B01J2/04—Processes or devices for granulating materials, e.g. fertilisers in general; Rendering particulate materials free flowing in general, e.g. making them hydrophobic by dividing the liquid material into drops, e.g. by spraying, and solidifying the drops in a gaseous medium
    • 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 spraying a melt jet according to the preamble of the main claim and a method for spraying refractory metals and ceramics.
  • the melt monofilament is clearly over 10 mm, depending on the discharge cross-section, also over 25 mm in length before it bursts open.
  • the risk of freezing the monofilament over this length is not great there because of the relatively small temperature difference between the melt jet and the gas flow, in particular the heat loss due to radiation is proportional to T 4 and measures of the present invention were not considered.
  • the atomization of a film results in a broader distribution of the particle sizes and these are coarser for a material under otherwise identical conditions than is possible with omnidirectional (monofilament) atomization according to the present method.
  • the throughput in film atomization can, however, be much larger because the slot cross section can be larger and the gas forces laterally attack a thin melt stream.
  • Fig. 1 shows a section through the atomizing device according to the invention
  • FIGS. 2a and 2b mutually perpendicular section through the lower region of a device for jetting with a slot-shaped melt nozzle.
  • a gas flow flows according to the arrows 7 from the side to the narrowest cross section 8, where it accelerates to the speed of sound when the critical pressure ratio is reached or exceeded.
  • the gas flow can be "cold", ie it can be ambient temperature or the temperature from it Compression and need not be heated up.
  • a separating flange 18 which separates the atomization chamber 19 below, in which the powder is collected and transported further in the narrowest area 8 of the Lavalduse 6 after the melt monofilament has burst open, and is transported further from the pressure chamber 20 located above. Because of the high temperatures, both the Lavalduse 6 and the housing of the container forming the atomizing chamber 19 are cooled, e.g. by being double-walled for the flow of cooling water.
  • the gas is supplied from the outside, and the melt is heated by an inductive heating in coil form around the crucible 1, expediently insulated against the crucible 1, cooling water flowing through the coil.
  • Resistance heaters are also used, but less so.
  • the design of rooms 20 and 19 in Fig. 1 is similar to that in DE 33 11 343, only in the room 20 above the separating flange 18 is a pressure vessel for pressures of 20, 30 bar overpressure and more, in the atomization chamber 19 below a vessel for pressures slightly above atmospheric pressure in order to be able to overcome the following separating devices such as cyclones, classifiers and filters.
  • the room 19 can also as
  • Pressure vessel are executed. This has advantages with the production of very fine powders, in which the average density in the atomization area of the narrowest cross section 8 is greater than if the pressure is relaxed to about atmospheric pressure.
  • the insulating piece 21 comprises, in the area of the lower wedge-shaped melt nipple 24, a screen 29 made of the best possible heat-insulating material, but which withstands the temperature, to reduce the heat dissipation on both sides of the lower wedge-shaped melt nipple 24. For further heat insulation there is between the screen 29 and the melt nipple 24 An air gap 30 is provided in the lower region.
  • the melt nipple 24 has a flow channel 31 which merges into a slot-shaped space 32 (see FIG. 2 b) which is arcuate in cross section and has a slot length and corresponding slot-shaped outlet opening 26.
  • the melt flow channel 31 can already be oval in preparation for the later expansion to the slot, as shown in FIG. 2b at 33.
  • the heat-insulating screen 29 is brought close to the slot-shaped outlet opening 26 and only a small part of the melt nipple 24 is released around it.
  • the lower wedge-shaped end 25 of the melt nipple 24 with the slit-shaped outlet opening 26 is above the likewise slit-shaped Lavalduse 27, which opens into an atomization chamber (not shown) with the pressure p 3 .
  • the upper part of the melt nipple 24, not shown here in more detail, is insulated against heat dissipation by, for example, rotationally symmetrical parts and, as shown in FIG. 1, can additionally be actively supported by heating.
  • the melt is fed to the flow channel 31 for spraying and the melt film emerging from the slot-shaped outlet opening is accelerated by the gas flow, which flows laterally into the capsule 34 along the arrows and accelerates on the way to the narrowest cross section 28 of the Lavalduse 27. Just below the Lavalduse, the film breaks up as described above.
  • Stainless steel of the type X2CrNiMo 17-12-2 corresponding to 316L was atomized from a crucible 1 and the nipple 2 with a discharge diameter of 1.5 mm, both made of aluminum oxide, at a melt temperature of 1680 ° C.
  • the diameter of the Lavalduse 6 was 4 mm.
  • a brass melt with a temperature of 950 ° C. was atomized from a device according to FIG. 1 with nitrogen (N 2 ) of 2 barg, and water was blown in laterally through 2 bores of 1.5 mm in diameter directly below the narrowest cross section 8.
  • the melt throughput was 1.3 kg / min, the amount of water sprayed in to cool the metal particles as quickly as possible, without round particles being produced by the surface tension, was about 1.5 kg / min.
  • the particles had a strongly irregular shape from ellipsoids to bone and root-shaped, but finer round particles also resulted.
  • the size distribution showed approximately

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)

Abstract

L'invention concerne un dispositif et un procédé pour atomiser un jet de matière fondue, notamment des métaux ou des céramiques réfractaires, et les transformer en poudre. Le jet de matière fondue, qui se présente sous forme de monofil ou de film, sort d'une buse alimentée en matière fondue et dotée d'un orifice de sortie dans la zone d'une tuyère de Laval. Ce jet de matière fondue est accompagné d'un flux gazeux de préférence «froid» que la tuyère de Laval accélère jusque dans le domaine de vitesse supersonique, un éclatement se produisant derrière la tuyère de Laval. La buse alimentée en matière fondue est entourée d'une isolation thermique qui s'étend jusque dans la zone de la tuyère de Laval et ne laisse libre pratiquement que l'orifice de sortie de ladite buse, de sorte que le jet de matière fondue est protégé du flux gazeux à sa sortie.
EP04764728A 2003-08-29 2004-08-27 Dispositif pour atomiser un jet de matiere fondue et procede pour atomiser des metaux ou des ceramiques refractaires Withdrawn EP1658150A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE2003140606 DE10340606B4 (de) 2003-08-29 2003-08-29 Vorrichtung zum Verdüsen eines Schmelzestrahls und Verfahren zum Verdüsen von hochschmelzenden Metallen und Keramikschmelzen
PCT/EP2004/009769 WO2005023465A1 (fr) 2003-08-29 2004-08-27 Dispositif pour atomiser un jet de matiere fondue et procede pour atomiser des metaux ou des ceramiques refractaires

Publications (1)

Publication Number Publication Date
EP1658150A1 true EP1658150A1 (fr) 2006-05-24

Family

ID=34223306

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04764728A Withdrawn EP1658150A1 (fr) 2003-08-29 2004-08-27 Dispositif pour atomiser un jet de matiere fondue et procede pour atomiser des metaux ou des ceramiques refractaires

Country Status (3)

Country Link
EP (1) EP1658150A1 (fr)
DE (1) DE10340606B4 (fr)
WO (1) WO2005023465A1 (fr)

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1923188A1 (fr) * 2006-11-14 2008-05-21 Linde Aktiengesellschaft Dispositif de production de particule
DE102006056119A1 (de) * 2006-11-14 2008-05-15 Linde Ag Vorrichtung zur Partikelerzeugung
US7827822B2 (en) * 2007-07-25 2010-11-09 Schott Corporation Method and apparatus for spray-forming melts of glass and glass-ceramic compositions
DE102008004607A1 (de) 2008-01-16 2009-05-28 Daimler Ag Lichtbogendrahtbrenner
CN102837001B (zh) * 2012-09-29 2013-07-03 湖南恒基粉末科技有限责任公司 一种金属液流易流出的微细金属粉末雾化喷嘴
DE102013022096B4 (de) 2013-12-20 2020-10-29 Nanoval Gmbh & Co. Kg Vorrichtung und Verfahren zum tiegelfreien Schmelzen eines Materials und zum Zerstäuben des geschmolzenen Materials zum Herstellen von Pulver
DE102014016723A1 (de) 2014-11-13 2016-05-19 C. Hafner Gmbh + Co. Kg Amorph erstarrende Legierung auf Edelmetallbasis
DE202014008963U1 (de) 2014-11-13 2016-02-16 C. Hafner Gmbh + Co. Kg Amorph erstarrende Legierung auf Edelmetallbasis
CN104985187B (zh) * 2015-07-08 2017-03-01 深圳市金鼎丰贵金属设备科技有限公司 一种粉末制备的贵金属雾化装置
CN109550623B (zh) * 2018-12-29 2021-01-22 中材江苏太阳能新材料有限公司 一种提高多晶硅铸锭用坩埚内表面粗糙度的方法
DE102019201472A1 (de) * 2019-02-05 2020-08-06 Deutsches Institut Für Lebensmitteltechnik E.V. Vorrichtung und Verfahren zur Herstellung feiner Fettpartikel
CN109986086A (zh) * 2019-03-08 2019-07-09 北京矿冶科技集团有限公司 一种用于增材制造的高球形度多组元合金粉末的制备方法
CN112296344B (zh) * 2020-12-18 2025-06-03 浙江亚通新材料股份有限公司 一种用于改善粉末球形度的双层气雾化喷嘴
DE102021212367A1 (de) 2021-11-03 2023-05-04 Sms Group Gmbh Verdüsungs-Einheit zum Verdüsen von metallenen Schmelzen, insbesondere für pulvermetallurgische Zwecke
WO2025051364A1 (fr) 2023-09-07 2025-03-13 Wacker Chemie Ag Fusion continue de silicium pour procédés en aval

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DE3311343C2 (de) * 1983-03-29 1987-04-23 Alfred Prof. Dipl.-Ing.Dr.-Ing. 7830 Emmendingen Walz Verfahren zur Herstellung von feinen Metallpulvern sowie Vorrichtung zur Durchführung des Verfahrens
US4631013A (en) * 1984-02-29 1986-12-23 General Electric Company Apparatus for atomization of unstable melt streams
US4622001A (en) * 1985-03-12 1986-11-11 Electra Form, Inc. Cavity cooling system
DE3533964C1 (de) * 1985-09-24 1987-01-15 Alfred Prof Dipl-Ing Dr-I Walz Verfahren und Vorrichtung zum Herstellen von Feinstpulver in Kugelform
US4784302A (en) * 1986-12-29 1988-11-15 Gte Laboratories Incorporated Gas atomization melt tube assembly
US5280884A (en) * 1992-06-15 1994-01-25 General Electric Company Heat reflectivity control for atomization process
US5468133A (en) * 1992-07-27 1995-11-21 General Electric Company Gas shield for atomization with reduced heat flux
DE19607114A1 (de) * 1995-01-28 1996-12-05 Lueder Dr Ing Gerking Fäden aus Schmelzen mittels kalter Gasstrahlen
DE19758111C2 (de) * 1997-12-17 2001-01-25 Gunther Schulz Verfahren und Vorrichtung zur Herstellung feiner Pulver durch Zerstäubung von Schmelzen mit Gasen
DE19929709C2 (de) * 1999-06-24 2001-07-12 Lueder Gerking Verfahren zur Herstellung von im Wesentlichen endlosen feinen Fäden und Verwendung der Vorrichtung zur Durchführung des Verfahrens
DE10001968B4 (de) * 1999-10-15 2004-02-12 Applikations- Und Technikzentrum Für Energieverfahrens-, Umwelt- Und Strömungstechnik (Atz-Evus) Verfahren zur Herstellung eines Pulvers

Non-Patent Citations (1)

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Title
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Also Published As

Publication number Publication date
DE10340606B4 (de) 2005-10-06
DE10340606A1 (de) 2005-03-31
WO2005023465A1 (fr) 2005-03-17

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