EP1356882A1 - Appareil pour la production d'une poudre metallique - Google Patents

Appareil pour la production d'une poudre metallique Download PDF

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Publication number
EP1356882A1
EP1356882A1 EP02450075A EP02450075A EP1356882A1 EP 1356882 A1 EP1356882 A1 EP 1356882A1 EP 02450075 A EP02450075 A EP 02450075A EP 02450075 A EP02450075 A EP 02450075A EP 1356882 A1 EP1356882 A1 EP 1356882A1
Authority
EP
European Patent Office
Prior art keywords
inert gas
melt
crucible
mouthpiece
pressure
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Withdrawn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
EP02450075A
Other languages
German (de)
English (en)
Inventor
Siegfried Schneider
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.)
Capital Technology GmbH
Original Assignee
Capital Technology GmbH
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 Capital Technology GmbH filed Critical Capital Technology GmbH
Priority to EP02450075A priority Critical patent/EP1356882A1/fr
Publication of EP1356882A1 publication Critical patent/EP1356882A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • 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
    • B22F2009/0816—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 by casting with pressure or pulsating pressure on the metal bath
    • 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
    • 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
    • B22F2009/0892—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 nozzle; controlling metal stream in or after the casting nozzle

Definitions

  • the invention relates to a device for producing powder metal with a heated crucible, a mouthpiece with a melt nozzle to form a melt jet, an inert gas supply for the crucible and with inert gas nozzles for feeding from inert gas to the melt jet to atomize it, according to the generic term of claim 1.
  • the invention also relates to a method for producing powder metal using a device according to the invention.
  • Powder metallurgy has boomed in recent years. The The main reason for this is that alloys cause segregation during solidification and thus associated problems tend to be used for purposes where Segregations are harmful to the properties sought, through powder metallurgical Processes can be produced relatively easily. Powder metallurgical also make it possible Process to produce alloys in which it is used for phase separation in solid state comes, so that such alloys do not come from the molten at all Condition can be made directly.
  • the powders obtained are then mostly used for the production of objects made of sintered material, or they are formed into dense bodies by various processes, such as HIPen ( h ot i sostatic p ressure), which can then be further processed it by machining or reshaping, the latter can take place in the cold or in the warm state.
  • HIPen h ot i sostatic p ressure
  • the actual manufacturing process of the metal powder is in these processes by characterized the following steps:
  • this protective gas atmosphere is mostly nitrogen, but there are also areas of application in which to avoid the Nitriding noble gases can be used.
  • the mouthpiece and the Nozzle in the bottom area of the crucible for glazing and must be replaced in this case become what is undesirable both because of the cost and because of the lost working time is.
  • the characteristic of it emerging melt jet is not constant, so that the reproducibility of the jet and so the metal particle obtained is bad and the parameters fail to find and adhere to that to create the desired grain size distribution to lead.
  • the object of the invention is to create a device which has the disadvantages mentioned does not have and which is able to endure longer downtimes while doing better reproducible characteristics of the emerging melt jet and the moreover, at least in one embodiment, the possibility of atomization of the jet in terms of both its characteristics and the desired grain size distribution adapt.
  • the stated objectives are in accordance with the characterizing part of the Claim 1 achieved in that the bottom of the crucible in the region of the mouthpiece is heated by its own heating, preferably by gas burners.
  • the protective gas is under excess pressure so that the relative influence of the hydrostatic pressure which changes during the leakage of the liquid metal is reduced. In order to the uniformity of the beam is further improved. In a particularly preferred one Embodiment is the pressure of the protective gas during the outflow of the melt increased to fully offset this change.
  • the Discharge nozzle provided protective gas nozzles, from which when using nitrogen as Inert gas, for example liquid nitrogen, is blown out in its angular position Axis of the melt stream can be changed. This makes it possible to have different Achieve atomization and thus different particle size distributions cause.
  • nitrogen as Inert gas for example liquid nitrogen
  • the single figure shows a crucible according to the invention in a purely schematic Cut, both on a technically correct reproduction of the cut and on the presentation of details that are not part of the invention has been omitted because the Those skilled in the field of powder metallurgy know these details and he knows them not needed to understand the invention.
  • a crucible 1 usually made of silicon dioxide or a similar high-temperature, Inert material absorbs the molten alloy 2 in its interior.
  • This alloy can either be introduced in the already molten state or it various components are introduced in solid form and melted in the crucible 1. Alloy 2 is melted and / or kept warm in a known manner Way by means of induction coils 3 which surround the crucible 1. Any oxidation To prevent, there is a protective gas 4 above the melt 2, in most Cases of nitrogen, in cases where there is a risk of nitriding, this can also be the case be a noble gas.
  • the crucible 1 is from the environment through a cover (not shown) completed.
  • the pressure of the protective gas 4 is preferably greater than the ambient pressure, particularly it is preferably controllable in order to change the hydrostatic pressure as explained above to be able to compensate at least partially when the melt 2 flows out.
  • the melt 2 flows at the bottom of the crucible 1 through a mouthpiece with a nozzle-shaped End made of zircon (zirconium dioxide or a similar, particularly temperature-resistant and inert material) and is inserted in the crucible. Locked is this mouthpiece 5 by a valve lifter 6, which is not shown by a Drive is vertically displaceable in the direction of the double arrow 7.
  • zircon zirconium dioxide or a similar, particularly temperature-resistant and inert material
  • the crucible 1 now has an outer region 11, which extends from the bottom 8 of the crucible 1 around the mouthpiece 5 downwards and then in the form of an outer one Crucible 11 is guided upwards again at a distance from the jacket wall of the crucible 1.
  • the Bottom region 9 of the annular gap 10 now opens from the outside several gas burners 12. These gas burners are located radially inward on the transition area between the crucible 1 and the crucible 11 and thus heat the crucible material and also the mouthpiece at temperatures that reliably prevent its glazing, for example about 1700 ° C.
  • gas burners 12 are uniform along the circumference of the outer crucible 11 arranged.
  • the gas burners do not have to be arranged exactly radially but can be pivoted slightly in the circumferential direction to generate a vortex be directed. It is also not necessary that the gas burners are arranged exactly horizontally are.
  • the combustion gases rise in the gap 10 and thus contribute to heating the melt 2 at.
  • the outer crucible 11 is on a horizontal insulation shield 13 attached or stored, the mouthpiece 5 protrudes through a suitably arranged recess down in the insulation shield 13 and is thickened by the insulation shield kept at temperature in this area. It is of course possible that Form outer crucible area 11 in the area of the mouthpiece 5 so that it is along of the mouthpiece 5 also projects downwards into or through the insulation shield 13.
  • inert gas nozzles 14 for spraying an inert gas.
  • nitrogen as the inert gas he preferably sprayed in liquid form to here with the temperatures and insulation to come to grips, a high gas pressure is usually used, so that the Nitrogen is still liquid at a temperature of -60 ° C.
  • the inert gas nozzles 14 are arranged concentrically to the mouthpiece 5 along a circle and according to the invention are independent of one another or in several groups 15 swiveling axes.
  • the axes 15 lie at least essentially in planes normal to the axis of symmetry 16 of the mouthpiece 5 and thus also the control rod 6 and of the melt beam 17. This pivotability makes it possible to separate the individual beams of the inert gas aimed specifically at the melt jet and thus the type of atomization of the liquid metal.
  • At least some of the inert gas nozzles 14 are also provided Arrange pivotable vertical axes that run parallel to axis 16 so that it is possible is to impart a vortex to the melt jet 17 or one during the outflow to strengthen or weaken the vortex formed.
  • the melt 2 is due to the additional heating of the mouthpiece 5 possible to form the melt jet 17 that forms during the entire runout atomize that the desired particle size distribution of the metal powder obtained best achieved.
  • the outflow started a melt that is significantly tougher due to the cooling in the mouthpiece than against The End.
  • the melt runs out at the beginning of the atomization process of the higher hydrodynamic pressure much faster than towards the end and through the rigidly positioned inert gas nozzles were weak at the beginning and closed at the end strong atomization of the melt jet, so that one is essentially stochastic Grain size distribution received.
  • the invention is not limited to the illustrated embodiment, but can be modified in various ways. So it is possible to use the crucible 1 and the outer Crucible 11 run in several parts and then put together, it is also possible to Increasing the mechanical stability of the two lateral surfaces of these crucibles with one another to connect by rod-like or wing-like structures and the like. more.
  • the insulation washer 13 need not have the shape shown, it is usually the ceiling of a closed, filled with inert gas collection chamber 18 for the powder shown in the illustration for reasons of clarity, however, is not indicated at all.
  • This collecting chamber 18 has the appropriate removal devices for the Powder; via fittings for discharging and, if necessary, recycling the inert gas; about Devices for regulating the pressure inside the collecting chamber; about cooling devices, Heaters and the like, but what the expert on this technical field is known and is therefore not explained here.
  • the process according to the invention essentially comprises that by means of the gas burners 12 Temperature of the mouthpiece 5 above the glazing temperature, preferably to the temperature the melt in the crucible 1, and that only then the melt nozzle is opened.
  • the pressure of the inert gas in the Inside the crucible 1 is increased during the outflow of the melt, preferably in the extent to which the hydrostatic pressure of the melt decreases.
  • One embodiment provides that the position of the inert gas nozzles 14 with respect to their pivot axes is changed while the melt is flowing out.
  • the method provides that the pressure or the mass flow of the inert gas, which the inert gas nozzles 14 flows out while the melt is flowing out. This means that the grain size distribution can be influenced in particular if the Melt does not flow out completely evenly.

Landscapes

  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
EP02450075A 2002-04-04 2002-04-04 Appareil pour la production d'une poudre metallique Withdrawn EP1356882A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP02450075A EP1356882A1 (fr) 2002-04-04 2002-04-04 Appareil pour la production d'une poudre metallique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02450075A EP1356882A1 (fr) 2002-04-04 2002-04-04 Appareil pour la production d'une poudre metallique

Publications (1)

Publication Number Publication Date
EP1356882A1 true EP1356882A1 (fr) 2003-10-29

Family

ID=28686053

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02450075A Withdrawn EP1356882A1 (fr) 2002-04-04 2002-04-04 Appareil pour la production d'une poudre metallique

Country Status (1)

Country Link
EP (1) EP1356882A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004081237A1 (fr) * 2003-03-11 2004-09-23 Holcim Ltd. Dispositif pour vaporiser des matieres fondues
CN100413617C (zh) * 2006-08-18 2008-08-27 陕西科技大学 一种制备金属超微粉体的装置及其方法
AT13319U1 (de) * 2012-07-25 2013-10-15 Rimmer Karl Dipl Ing Dr Verfahren zur Herstellung eines Pulvers einer Metalllegierung
CN106334800A (zh) * 2016-11-22 2017-01-18 沈阳真空技术研究所 冷坩埚底注式感应雾化制备钛粉设备
CN106694896A (zh) * 2016-12-30 2017-05-24 西安交通大学青岛研究院 一种TiAl粉的雾化制备装置
CN106735278A (zh) * 2016-12-30 2017-05-31 西安交通大学青岛研究院 一种TiAl粉的雾化制备装置
EP4019162A1 (fr) * 2020-12-23 2022-06-29 Linde GmbH Procédé et système de fourniture de métal fondu

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059003A (ja) * 1983-09-09 1985-04-05 Ulvac Corp 誘導加熱式真空アトマイズ装置
JPS61153207A (ja) * 1984-12-27 1986-07-11 Sumitomo Metal Mining Co Ltd 金属微粉末の製造方法
JPS63114908A (ja) * 1986-11-04 1988-05-19 Sumitomo Metal Ind Ltd ガスアトマイズ装置
US5423520A (en) * 1993-04-13 1995-06-13 Iowa State University Research Foundation, Inc. In-situ control system for atomization

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6059003A (ja) * 1983-09-09 1985-04-05 Ulvac Corp 誘導加熱式真空アトマイズ装置
JPS61153207A (ja) * 1984-12-27 1986-07-11 Sumitomo Metal Mining Co Ltd 金属微粉末の製造方法
JPS63114908A (ja) * 1986-11-04 1988-05-19 Sumitomo Metal Ind Ltd ガスアトマイズ装置
US5423520A (en) * 1993-04-13 1995-06-13 Iowa State University Research Foundation, Inc. In-situ control system for atomization

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 009, no. 194 (M - 403) 10 August 1985 (1985-08-10) *
PATENT ABSTRACTS OF JAPAN vol. 010, no. 357 (M - 540) 2 December 1986 (1986-12-02) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 360 (M - 746) 27 September 1988 (1988-09-27) *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004081237A1 (fr) * 2003-03-11 2004-09-23 Holcim Ltd. Dispositif pour vaporiser des matieres fondues
CN100413617C (zh) * 2006-08-18 2008-08-27 陕西科技大学 一种制备金属超微粉体的装置及其方法
AT13319U1 (de) * 2012-07-25 2013-10-15 Rimmer Karl Dipl Ing Dr Verfahren zur Herstellung eines Pulvers einer Metalllegierung
CN106334800A (zh) * 2016-11-22 2017-01-18 沈阳真空技术研究所 冷坩埚底注式感应雾化制备钛粉设备
CN106334800B (zh) * 2016-11-22 2018-05-29 沈阳真空技术研究所 冷坩埚底注式感应雾化制备钛粉设备
CN106694896A (zh) * 2016-12-30 2017-05-24 西安交通大学青岛研究院 一种TiAl粉的雾化制备装置
CN106735278A (zh) * 2016-12-30 2017-05-31 西安交通大学青岛研究院 一种TiAl粉的雾化制备装置
CN106735278B (zh) * 2016-12-30 2018-09-18 西安交通大学青岛研究院 一种TiAl粉的雾化制备装置
EP4019162A1 (fr) * 2020-12-23 2022-06-29 Linde GmbH Procédé et système de fourniture de métal fondu
WO2022135735A1 (fr) * 2020-12-23 2022-06-30 Linde Gmbh Procédé et système pour fournir du métal fondu

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