EP1022078B1 - Verfahren und Vorrichtung zur Herstellung von Metallpulver durch Gasverdüsung - Google Patents

Verfahren und Vorrichtung zur Herstellung von Metallpulver durch Gasverdüsung Download PDF

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Publication number
EP1022078B1
EP1022078B1 EP20000890013 EP00890013A EP1022078B1 EP 1022078 B1 EP1022078 B1 EP 1022078B1 EP 20000890013 EP20000890013 EP 20000890013 EP 00890013 A EP00890013 A EP 00890013A EP 1022078 B1 EP1022078 B1 EP 1022078B1
Authority
EP
European Patent Office
Prior art keywords
melt
gas
flow
gas jet
jet
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.)
Expired - Lifetime
Application number
EP20000890013
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German (de)
English (en)
French (fr)
Other versions
EP1022078A3 (de
EP1022078A2 (de
Inventor
Claes Tornberg
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.)
Voestalpine Boehler Edelstahl GmbH
Original Assignee
Boehler Edelstahl GmbH
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Filing date
Publication date
Application filed by Boehler Edelstahl GmbH filed Critical Boehler Edelstahl GmbH
Publication of EP1022078A2 publication Critical patent/EP1022078A2/de
Publication of EP1022078A3 publication Critical patent/EP1022078A3/de
Application granted granted Critical
Publication of EP1022078B1 publication Critical patent/EP1022078B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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 method for producing metal powder from similar melts, one from a nozzle body of a metallurgical Vessel emerging melt stream in a atomization chamber Gas jets split into droplets and these into essentially spherical Powder grains are allowed to solidify.
  • the invention further comprises an apparatus for producing metal powder similar melts consisting essentially of a spray chamber, into which from a metallurgical vessel by means of a melt nozzle body a molten metal stream can be introduced or entered, one in this chamber Disintegration unit arranged on the entry side, with gas nozzles for Actuation of the melt stream by gas jets to break it up Droplets, a solidification space provided on the discharge side for cooling the Droplets and formation of powder grains, as well as subordinate Powder processing facilities.
  • a spray chamber into which from a metallurgical vessel by means of a melt nozzle body a molten metal stream can be introduced or entered, one in this chamber Disintegration unit arranged on the entry side, with gas nozzles for Actuation of the melt stream by gas jets to break it up Droplets, a solidification space provided on the discharge side for cooling the Droplets and formation of powder grains, as well as subordinate Powder processing facilities.
  • Gas atomized metal powders are used in materials and surface technology Due to the increasing quality requirements for the products in increasing Dimensions used.
  • the type of use determines an advantageous one Powder grain size and a similar grain size distribution, that is the respective one Proportion of powder grains with a certain diameter in one Diameter range.
  • a use of a so-called Mono-grain powder is technically inexpensive and economical.
  • Powder advantageously have a high bulk density and thus a corresponding Have grain size distribution.
  • Gas-atomized metal powder is essentially produced in such a way that a liquid metal stream with gas, preferably inert gas or inert gas, which has a high flow velocity or kinetic energy, is applied.
  • gas preferably inert gas or inert gas, which has a high flow velocity or kinetic energy
  • the application of gas causes the metal flow to split into fine droplets, which subsequently solidify into grains.
  • the temperature, viscosity and surface tension of the liquid Metal is in particular the acceleration of the melt by the gas jet or are the forces involved (powder production and spray forming, Advances in Powder Metallurgy & Particulate Materials- 1992, Volume 1, Metal Powder Industries Federation, Princeton, N.J., Page 137-150, Particle size prediction in an atomization system; Claes Tomberg) for the size and the Size distribution of the powder grains formed is decisive.
  • Gas atomization processes for metal melts are known, in which the Liquid metal immediately after it emerges from the nozzle body of the metallurgical vessel with one or more gas jets from directly on Outlet arranged nozzles is divided. Because the gas is on the one hand at the outlet has a high speed, on the other hand the high temperature effect because it expands rapidly and loses its effect towards the center of the beam an extremely wide metal powder fraction with coarse and fine fractions.
  • a device for metal powder production is known from SE-AS-421758 become, in which the melt flow in the Atomization chamber two gas jets are used. There is a Actuation of the free-flowing melt stream by a first one Gas jet with an angle of approx. 20 °, which leads to a breakup and Deflecting the stream leads, after which this is vertical from a second gas jet is broken into metal droplets with high intensity. With this procedure is Although metal droplets adhered to the gas nozzle parts, the large distance of the second nozzle from the point of division of the melt, however, causes a broad grain size distribution with small amounts of fine powder.
  • a method of applying a vertical metal flow through a horizontal gas jet has been proposed in accordance with US 4,282,903, wherein a advantageously small nozzle spacing is used.
  • An auxiliary gas jet is thereby attached to the nozzle body by metal droplets in the nozzle area, directed obliquely to the cutting site.
  • the compact melt stream is almost exclusively divided by means of the horizontally directed main gas jet, so that the spreading on fine-grained powder is low.
  • the invention seeks to remedy this and aims to Manufacturing process for metal powder from melts to specify with which high fines content and avoidance of unfavorable coarse particles desired broad particle size distribution of the powder is economically achievable. Furthermore, it is an object of the invention to provide a device with which conveniently metal powder in a fraction or with a grain size distribution Can be produced with which this, for example a high bulk density showing, possibly by hot isostatic pressing (HIPen) particularly high quality products can be processed.
  • HIPen hot isostatic pressing
  • This goal can be achieved in a generic method in that the emerging essentially vertically from the melt nozzle body Melt flow through at least three successive gas jets different directions are at least partially applied,
  • the task is solved in that the disintegration unit at least three gas nozzle body has, the gas jets in an effective sequence in each case on the introduced Melt flow and on the by the upstream gas jet into one Directed and shaped melt flow with an angle between 5 ° and 170 ° can be aligned.
  • the particle size is approximately equal to the value the square root of a constant broken by the acceleration.
  • the from Melt nozzle body emerging melt stream by means of at least one deflected and spread the first gas jet in its flow direction or is thinned and / or cut, followed by at least one, the same Directional component, obliquely incident second gas jet spread and / or split flat melt stream prepared in its form and a suction barrier for the nozzle (s) of at least one downstream third Gas jet builds up, which third gas jet obliquely to partially directed to the processed flat melt stream as a high-speed gas jet is formed and a Feinaufieilu or atomization of the liquid jet to Droplets accomplished which metal droplets subsequently solidified become.
  • the compact melt flow can have a largely flat shape on the impact side
  • Metal flow can be created, the flow velocity and the Angle of flow of the gas jet from the thickness and from the stability or from the Length of the free-flowing melt stream and the desired thinning or Depend on spread.
  • the inflow side one for one is often created Ultimate division of the flat current with unfavorable surface shape loose metal particles. According to the invention, this is an unfavorable one Surface shape side of the flat current by means of a downstream second, obliquely incident gas jet and thus the stream set up for effective splitting into metal droplets.
  • This gas jet can also be built up with a suction barrier, which is another advantage no liquid particles can get to the last effective lavate nozzle body, so that the operational safety of the device is not impaired in this regard. It it is also important that the high speed beam is directed obliquely onto the Flat melt flow is directed because this has a large force effect in With regard to a fine division into metal droplets. The bigger the slope to the flat current, up to the partial counter-direction of the gas jet enough, is formed, the higher the acceleration of the metal and ultimately be the fine grain portion of the metal powder.
  • melt flow with a diameter of 2.0 mm to 15.0 mm by at least a first gas jet in its flow direction by one Angle ⁇ between 5 ° and 85 ° m, preferably between 15 ° and 30 °, deflected and is spread substantially in a sector shape to form a melt flat stream.
  • Angle ⁇ between 5 ° and 85 ° m, preferably between 15 ° and 30 °
  • a particularly efficient one Flat current formation of the liquid metal is deflected at an angle between 15 ° and 30 ° reached, with deflections greater than 45 ° a disadvantageous disassembly of the Can cause electricity through the gas jet.
  • the sector-shaped Melt flat flow after reaching one caused by the first gas jet Width of at least 5 times, preferably at least 10 times, the free-falling Melt flow width or thickness by at least a third gas jet the is designed as a high-speed gas jet, with an angle ⁇ between 25 ° and 150 °, preferably between 60 ° and 90 °, deflected and into one Stream of droplets is atomized or broken up. If the melt flow is less than Spread 5 times the original melt flow thickness is its compactness large and the amount of fine powder that can be produced is comparatively low.
  • a spread of greater than 10 times the melt flow diameter produces particularly good Prerequisites for a breakdown into droplets with a high fine fraction, especially if the high-speed gas jet causing this also deflects the melt flow at an angle between 60 ° and 90 °.
  • larger Deflection angles up to 150 ° increase the fine grain fraction and cause a tendency to Monokom Struktur.
  • the first gas nozzle body is in an advantageous embodiment of the invention arranged such that the first gas jet formed by it is the same Having directional component, with the angle ⁇ 'between 5 ° and 85 °, preferably with an angle ⁇ between 15 ° and 30 ° on the melt stream is directed and that the length of the free-falling melt stream is equal to that Length: Distance of the gas nozzle from the point of impact of the gas jet on the Melt flow, increased or decreased by a value that at most is 10 times the diameter of the melt flow.
  • the second nozzle body is arranged in this way is that the second gas jet in the sequence of action on the by the upstream first gas jet spread and thinned flat melt stream with the same Flow direction component with an angle ⁇ between 5 ° and 85 °, is preferably directed at an angle ⁇ between 15 ° and 30 ° and that the Impact point of this second gas jet in the area of or before the deflection, Impact or atomization point of the downstream third gas jet lies.
  • the Angle between the second gas jet and the flat melt stream and its The point of impact on the melt stream is of double importance.
  • the third nozzle body is arranged such that a high-speed gas jet third or in the sequence of action last gas jet with an angle ⁇ 'between 25 ° and 150 °, preferably greater than 60 ° directed to the melt flow and that the distance between the gas nozzle (s) and the deflecting, appearance or atomization point is less than 20 times the value of Gas nozzle diameter, the facility is highly efficient excellent powder quality achieved because of a breakdown of the metal into droplets a high force effect or acceleration can be used. The increases Force effect or acceleration with increasing angle, with which overall finer powder fractions can be created.
  • At least one Gas jet as a flat jet or multiple jet through the arrangement of several positioned next to each other and / or in particular one above the other Nozzle is formed the available gas jet width can be applied to the Melt flow can be increased.
  • a first gas jet 1 is formed by a first gas nozzle A, which acts at a distance L A on the melt stream S in the region 11 with the same directional component but with an angle ⁇ '.
  • a second gas jet 2 is created, which Metal melt flow FS after a spreading section of the same in one Impact point 21 with the same directional component, but with an angle ⁇ applied.
  • a gas nozzle C which is preferably designed as a Laval nozzle, creates a gas jet 3, which acts on the flat melt stream FS at a distance L C from the nozzle C in a deflection, impact or atomization point 31 at an angle 'and subsequently divides it into causes a metal particle flow P.
  • the application of the flat melt flow FS by the gas jet 3 can take place obliquely to partially in the opposite direction.
  • FIG. 2a and 2b schematically show a melt stream S, each in a view from two directions offset by 90 ° (elevation and cross-section).
  • a melt stream S is introduced essentially vertically from a melt nozzle body D into a disintegration unit of a spray chamber.
  • the melt stream S with a diameter S 1 is acted upon by a gas jet 1 after a free-fall section at a point of impact 11 and, as can be seen from FIG. 2 b, is thereby deflected and thinned with an angle ⁇ and, as shown in FIG. 2 a, spread to a flat current FS.
  • the flat melt flow FS is acted upon by a high-performance gas jet 3 in a deflection point, impingement or atomization point 31, which jet causes a metal particle flow P to be formed.
  • a gas jet 2 which strikes the flat stream FS at a point 21, it also being possible to change the flow direction of the metal stream.

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  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
EP20000890013 1999-01-19 2000-01-18 Verfahren und Vorrichtung zur Herstellung von Metallpulver durch Gasverdüsung Expired - Lifetime EP1022078B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT7099 1999-01-19
AT0007099A AT409235B (de) 1999-01-19 1999-01-19 Verfahren und vorrichtung zur herstellung von metallpulver

Publications (3)

Publication Number Publication Date
EP1022078A2 EP1022078A2 (de) 2000-07-26
EP1022078A3 EP1022078A3 (de) 2003-05-07
EP1022078B1 true EP1022078B1 (de) 2004-10-27

Family

ID=3480743

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20000890013 Expired - Lifetime EP1022078B1 (de) 1999-01-19 2000-01-18 Verfahren und Vorrichtung zur Herstellung von Metallpulver durch Gasverdüsung

Country Status (9)

Country Link
US (3) US6334884B1 (da)
EP (1) EP1022078B1 (da)
JP (1) JP4171955B2 (da)
AT (2) AT409235B (da)
DE (1) DE50008367D1 (da)
DK (1) DK1022078T3 (da)
ES (1) ES2231150T3 (da)
SI (1) SI1022078T1 (da)
UA (1) UA61959C2 (da)

Families Citing this family (20)

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AT409235B (de) * 1999-01-19 2002-06-25 Boehler Edelstahl Verfahren und vorrichtung zur herstellung von metallpulver
AT408990B (de) * 2000-08-16 2002-04-25 Holderbank Financ Glarus Einrichtung zum zerstäuben von flüssigen medien, insbesondere flüssigen schmelzen
AT411580B (de) * 2001-04-11 2004-03-25 Boehler Edelstahl Verfahren zur pulvermetallurgischen herstellung von gegenständen
EP1434666B1 (de) * 2001-10-10 2005-01-05 Claes Tornberg Verfahren zur herstellung von metallpulver aus spratzigen teilchen
AT412328B (de) * 2002-04-03 2005-01-25 Claes Dipl Ing Tornberg Verfahren zur herstellung von metallpulver
AT411230B (de) * 2001-10-10 2003-11-25 Claes Dipl Ing Tornberg Verfahren zur herstellung von metallpulver aus spratzigen teilchen
DE10205897A1 (de) * 2002-02-13 2003-08-21 Mepura Metallpulver Verfahren zur Herstellung von partikelförmigem Material
US7744808B2 (en) * 2007-12-10 2010-06-29 Ajax Tocco Magnethermic Corporation System and method for producing shot from molten material
CH705750A1 (de) 2011-10-31 2013-05-15 Alstom Technology Ltd Verfahren zur Herstellung von Komponenten oder Abschnitten, die aus einer Hochtemperatur-Superlegierung bestehen.
EP2700459B1 (en) 2012-08-21 2019-10-02 Ansaldo Energia IP UK Limited Method for manufacturing a three-dimensional article
EP2737965A1 (en) * 2012-12-01 2014-06-04 Alstom Technology Ltd Method for manufacturing a metallic component by additive laser manufacturing
US9981315B2 (en) * 2013-09-24 2018-05-29 Iowa State University Research Foundation, Inc. Atomizer for improved ultra-fine powder production
KR101536454B1 (ko) * 2013-12-20 2015-07-13 주식회사 포스코 분말 제조 장치 및 분말 형성 방법
EP3756799A1 (en) * 2015-07-17 2020-12-30 AP&C Advanced Powders And Coatings Inc. Plasma atomization metal powder manufacturing processes and systems therefore
KR102544904B1 (ko) * 2015-10-29 2023-06-16 에이피앤드씨 어드밴스드 파우더스 앤드 코팅스 인크. 금속 분말 분무화 제조 공정
EP3442726B1 (en) 2016-04-11 2023-01-04 AP&C Advanced Powders And Coatings Inc. Reactive metal powders in-flight heat treatment processes
KR102421026B1 (ko) * 2016-08-24 2022-07-14 5엔 플러스 아이엔씨. 저융점 금속 또는 합금 분말 미립화 제조 공정
US20190217393A1 (en) 2018-01-12 2019-07-18 Hammond Group, Inc. Methods for processing metal-containing materials
EP3752304B1 (en) 2018-02-15 2023-10-18 5n Plus Inc. High melting point metal or alloy powders atomization manufacturing processes
EP3781339A4 (en) 2018-04-04 2021-09-22 Metal Powder Works, LLC SYSTEM AND PROCESS FOR MANUFACTURING POWDERS FROM DUCTILE MATERIALS

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Also Published As

Publication number Publication date
UA61959C2 (uk) 2003-12-15
ES2231150T3 (es) 2005-05-16
JP2000212608A (ja) 2000-08-02
EP1022078A3 (de) 2003-05-07
US20040031354A1 (en) 2004-02-19
ATA7099A (de) 2001-11-15
EP1022078A2 (de) 2000-07-26
AT409235B (de) 2002-06-25
SI1022078T1 (en) 2005-06-30
US6632394B2 (en) 2003-10-14
US7198657B2 (en) 2007-04-03
DK1022078T3 (da) 2005-03-14
JP4171955B2 (ja) 2008-10-29
US6334884B1 (en) 2002-01-01
US20010054784A1 (en) 2001-12-27
ATE280649T1 (de) 2004-11-15
DE50008367D1 (de) 2004-12-02

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