EP0150755A2 - Procédé et installation pour la préparation de poudre métallique - Google Patents

Procédé et installation pour la préparation de poudre métallique Download PDF

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Publication number
EP0150755A2
EP0150755A2 EP85100339A EP85100339A EP0150755A2 EP 0150755 A2 EP0150755 A2 EP 0150755A2 EP 85100339 A EP85100339 A EP 85100339A EP 85100339 A EP85100339 A EP 85100339A EP 0150755 A2 EP0150755 A2 EP 0150755A2
Authority
EP
European Patent Office
Prior art keywords
metal
gas
passage
riser pipe
formation
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.)
Granted
Application number
EP85100339A
Other languages
German (de)
English (en)
Other versions
EP0150755A3 (en
EP0150755B1 (fr
Inventor
Joseph M. Wentzell
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.)
Nyby Uddeholm Powder AB
Original Assignee
Nyby Uddeholm Powder AB
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 Nyby Uddeholm Powder AB filed Critical Nyby Uddeholm Powder AB
Publication of EP0150755A2 publication Critical patent/EP0150755A2/fr
Publication of EP0150755A3 publication Critical patent/EP0150755A3/de
Application granted granted Critical
Publication of EP0150755B1 publication Critical patent/EP0150755B1/fr
Expired 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

Definitions

  • the invention relates to a method and a device for producing metal powder by atomizing a molten metal from a riser pipe.
  • DE-AS 1 285 098 discloses a method and a device of the type mentioned at the outset, primarily for the production of small metal balls, as are required for ballpoint pens, ball bearings or the like.
  • a Upright standpipe immersed in a molten metal and rotated around its longitudinal axis.
  • the metal melt rising in the riser pipe or riser channel is thrown off at the upper end of the riser pipe, extending approximately radially outwards from a central riser channel, forming solidifying melt droplets.
  • the present invention has for its object to provide a method and an apparatus of the type mentioned, by means of which metal powder of the highest consistent quality can be produced with minimal design, process engineering and energy expenditure.
  • the starting point for the production of metal powder is a metal or metal-alloy melt, the entire production process taking place in a closed space, preferably in an inert gas, in particular in argon.
  • the metal powder produced by the method according to the invention or by the device according to the invention is characterized by the highest degree of homogeneity, both with regard to the composition, the structure and the shape and size of the metal particles.
  • the metal melt is preferably mixed with gas, preferably inert gas, to form a metal foam which is "blasted" or broken up into fine, sometimes still hollow, metal droplets in a pulverization chamber by exposure to inert pressure gas.
  • gas preferably inert gas
  • the inert pressurized gas preferably argon, serves at the same time to move the metal droplets from the pulverization chamber into a closed expansion space, namely a collecting container, preferably by means of a flow direction to press through the converging mouthpiece, causing a so-called secondary division of the metal droplets into even finer, fully dense particles.
  • the possibly existing hollow or hollowed-out metal droplets burst during the secondary distribution.
  • the metal droplets are torn apart by the high acceleration in the converging mouthpiece.
  • the finest, fully dense metal powder settles in the expansion space or collection container, in which the pressure is much lower than in the upstream pulverization chamber. Objects of the highest dimensional stability can be produced from this metal powder.
  • metal also includes metal alloys, in particular stainless steel alloys and super alloys.
  • the external compressed gas flow in the area of the passage from the pulverizing chamber to the expansion space or collecting container causes the metal particles to experience a high acceleration similar to that caused by the converging mouthpiece Claim 7, wherein both measures can be combined with the advantage that the acceleration in the area of the passage mentioned by the external "acceleration flow” can be varied depending on the desired degree of secondary distribution.
  • the external pressure gas flow in the region of the passage from the pulverization chamber to the collecting container is preferably a flow which is approximately uniform across the circumference of the passage and is approximately parallel to the wall.
  • Inert gas is preferably also used as the compressed gas, especially argon.
  • a crucible 3 is arranged for receiving a metal or metal-alloy melt.
  • a riser pipe 7 led out of the receptacle 2 is located above the crucible 3.
  • the crucible 3 can be raised within the receptacle 2 so far that the riser pipe 7 is immersed in the molten metal.
  • the Hubeinrichtunq 5 is connected to a lifting table 4 on which the crucible 3 is attached.
  • the riser pipe 7 is closed with a cap-like cover 7a ', which is destroyed when the riser pipe 7 is immersed in the molten metal.
  • a device 6 for generating the required heat of fusion is assigned to the crucible 3; In the illustrated embodiment, an induction coil of a known type, the electrical connections of which are led out of the receptacle 2 (plug connection 21.
  • a gas pressure line 11 opens into the receptacle 2, the mouth opening being identified by the reference number 12.
  • Gas is introduced into the receptacle through the gas pressure line 11 , in particular inert gas, for example argon, can be introduced, with the formation of an internal container pressure, which presses the metal melt upward in the riser pipe 7 when it is immersed in the metal melt,
  • inert gas for example argon
  • the gas pressure in the interior of the receptacle 2 acts on the free surface of the metal melt that no inadmissibly high gas pressure is formed inside the receptacle, the receptacle 2 is provided with a safety valve 19.
  • the riser pipe 7 is led out of the receptacle 2 through a sleeve 14 arranged in the cover of the receptacle 2, the inside diameter of the sleeve 14 being larger than the outside diameter of the riser pipe 7 and the resulting annular space 23 between the riser pipe 7 and the sleeve 14 relative to the interior of the receptacle 2 on the one hand (ring seal 21) and the external environment on the other hand (ring seal 22) is sealed.
  • a gas pressure line 13 opens into the annular space 23, through which an inert gas, preferably argon, can be admixed into the annular space 23 and from there through an opening 15 in the riser pipe 7 of the molten metal rising in the riser pipe (with a correspondingly high gas pressure inside the receptacle 2). so that the molten metal leaves the riser pipe as a metal foam.
  • the annular space 23 serves as a gas calming zone.
  • a so-called pulverization chamber 8 is connected to the upper end of the riser pipe 7, which is already outside the receptacle 2 and into which inert gas, namely argon, can also be blown in under high pressure via an opening 18. Similar to the upper part of the riser pipe 7, the pulverization chamber 8 is surrounded by an annular space 16 which is sealed off from the external environment and into which a gas pressure line 17 opens.
  • the gas pressure lines 11, 13 and 17 each have gas pressure regulating valves 20, so that the pressure of the gas introduced through these lines can be individually matched to one another.
  • the metal foam is atomized or divided into - to a small extent sometimes hollow - metal droplets, which are still relatively large in volume.
  • the pressurized gas introduced into the pulverization chamber 8 serves at the same time to blow the metal droplets through a convergingly narrowing passage 9 into an expansion space, that is to say a space of low pressure, namely a closed collecting container 10, with the formation of the finest, fully dense metal powder.
  • the converging narrowing of the passage 9 and the acceleration of the gas-metal droplet flow from the pulverizing chamber 8 into the collecting container 10 which is achieved in this way are of very important importance.
  • the convergingly narrowing passage 9 is directed obliquely upwards at an angle ⁇ of approximately 45 ° with respect to the horizontal.
  • the longitudinal axis of the passage 9 coincides with the longitudinal axis of the pulverization chamber 8.
  • the converging passage 9 can be designed as an interchangeable mouthpiece, so that depending on the selected gas pressures and the metal alloy used, differently converging passages 9 can be used as a corresponding one Mouthpiece can be selected. If the acceleration in passage 9 occurs through the mentioned external ring flow, the degree of acceleration can be changed by corresponding action on this ring flow. Both measures are then preferably applied, namely an outer ring flow and a converging mouthpiece, as a result of which a replacement of the mouthpiece with a corresponding change in the outer ring flow can be unnecessary.
  • the mouthpiece can also be pivoted so that the optimal angle ⁇ can be individually adjusted.
  • the melting crucible 3 filled with molten metal is first arranged on the lifting table 4 within the induction coil 6.
  • the induction coil 6 ensures that the metal in the crucible 3 remains in the molten state.
  • the receptacle 2 is then sealed gas-tight and filled with argon via the gas pressure line 11 and opening 12.
  • the lifting table 4 and thus the crucible 3 with the melt are raised so far by means of the lifting device 5 that the riser pipe 7 dips into the molten metal with its lower end, as a result of which the covering cap 7a is destroyed. Due to the gas pressure in the interior of the receptacle 2, which acts on the free surface of the melt, the melt is pressed upwards by the riser pipe 7.
  • a non-reactive gas such as argon
  • argon is added to the ascending molten metal via the line 13, the annular space 23 and the opening 15 in the upper region of the riser pipe 7, thereby producing metal foam.
  • the metal droplets are simultaneously blown through the converging passage 9 into a collecting container 10 to form the finest fully dense metal particles.
  • the hollow or hollowed-out metal droplets which may arise in the chamber 8 literally burst open in the passage 9 and disintegrate into the finest metal particles due to partial pressure differences inside and outside the metal droplet cavities.
  • the collecting container 10 is sealed gas-tight from the environment.
  • the converging, narrowing passage is very important for the fine atomization. Through the converging passage gas consumption can also be significantly reduced.
  • the converging narrowing passage 9 thus results in a further or secondary division of the metal droplets formed in the pulverization chamber 8, specifically because of the acceleration and acceleration forces which act on the metal droplets in the passage 9.
  • the aforementioned partial pressure differences also arise in the region of the convergingly narrowing passage 9, which cause any hollow metal droplets which may be present to burst open and further crush the same. This effect is also achieved with comparatively low gas consumption.
  • the convergence of the passage 9 determines the pressure in the pulverization chamber 8 as well as the acceleration of the metal droplets and the resulting break-up forces, the degree of convergence depending on the metal to be pulverized (metal / metal alloy) and the desired particle size.

Landscapes

  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Disintegrating Or Milling (AREA)
  • Float Valves (AREA)
  • Powder Metallurgy (AREA)
  • Conductive Materials (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Heat Treatment Of Sheet Steel (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
  • Stored Programmes (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Burglar Alarm Systems (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
EP85100339A 1984-01-25 1985-01-15 Procédé et installation pour la préparation de poudre métallique Expired EP0150755B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3402500A DE3402500C1 (de) 1984-01-25 1984-01-25 Verfahren und Vorrichtung zur Herstellung von Metallpulver
DE3402500 1984-01-25

Publications (3)

Publication Number Publication Date
EP0150755A2 true EP0150755A2 (fr) 1985-08-07
EP0150755A3 EP0150755A3 (en) 1987-02-25
EP0150755B1 EP0150755B1 (fr) 1989-08-30

Family

ID=6225866

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85100339A Expired EP0150755B1 (fr) 1984-01-25 1985-01-15 Procédé et installation pour la préparation de poudre métallique

Country Status (22)

Country Link
US (1) US4610719A (fr)
EP (1) EP0150755B1 (fr)
JP (1) JPS60221507A (fr)
KR (1) KR900009217B1 (fr)
AT (1) ATE45897T1 (fr)
AU (1) AU575518B2 (fr)
BR (1) BR8500319A (fr)
CA (1) CA1228458A (fr)
CS (1) CS273161B2 (fr)
DD (1) DD232212A5 (fr)
DE (2) DE3402500C1 (fr)
DK (1) DK161571C (fr)
ES (1) ES8608975A1 (fr)
FI (1) FI76716C (fr)
IL (1) IL74135A (fr)
IN (1) IN163942B (fr)
MX (1) MX162212A (fr)
NO (1) NO164220C (fr)
PL (1) PL143335B1 (fr)
PT (1) PT79874B (fr)
RO (1) RO91979B (fr)
SU (1) SU1563584A3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175078A2 (fr) * 1984-07-26 1986-03-26 UltraFine Powder Technology, Inc. Procédé et installation pour la production de poudre métallique ultrafine par solidification rapide

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3622123A1 (de) * 1986-07-02 1988-01-21 Dornier System Gmbh Verfahren und vorrichtung zur herstellung von verbundpulvern
US4768577A (en) * 1986-10-07 1988-09-06 The United States Of America As Represented By The Department Of Energy Dissolution of inert gas in a metal alloy
US4810288A (en) * 1987-09-01 1989-03-07 United Technologies Corporation Method and apparatus for making metal powder
US4808218A (en) * 1987-09-04 1989-02-28 United Technologies Corporation Method and apparatus for making metal powder
US4793853A (en) * 1988-02-09 1988-12-27 Kale Sadashiv S Apparatus and method for forming metal powders
DE4019563A1 (de) * 1990-06-15 1991-12-19 Mannesmann Ag Verfahren zur herstellung von metallpulver
KR100387565B1 (ko) * 1998-04-13 2003-10-10 안정오 파장전사체의제법
DE10205897A1 (de) * 2002-02-13 2003-08-21 Mepura Metallpulver Verfahren zur Herstellung von partikelförmigem Material
JP5219125B2 (ja) * 2008-01-23 2013-06-26 宇宙 宮尾 マグネシウム粒子製造装置
CN106392090A (zh) * 2016-12-21 2017-02-15 重庆市万盛区顺达粉末冶金有限公司 一种用于粉末冶金的制粉系统
EP3714970A1 (fr) 2019-03-28 2020-09-30 Catalytic Instruments GmbH & Co. KG Appareil pour la production de nanoparticules et procédé de production de nanoparticules
JP6874054B2 (ja) * 2019-05-31 2021-05-19 株式会社クボタ 溶融金属吐出装置、皮膜形成装置及び溶融金属吐出方法
RU2730313C1 (ru) * 2020-01-20 2020-08-21 Общество с ограниченной ответственностью "Порошковые технологии" Установка для получения металлических порошков из расплавов металлов и сплавов
CN114472909B (zh) * 2022-02-07 2023-03-31 山东恒瑞磁电股份有限公司 一种一体成型电感合金原料粉制备装置
CN114472878B (zh) * 2022-02-07 2023-04-11 山东恒瑞磁电股份有限公司 一种一体成型电感软磁粉的制备方法及应用

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1194444A (en) * 1967-12-15 1970-06-10 Homogeneous Metals Method and Apparatus for making Metal Powders
GB1307553A (en) * 1970-06-06 1973-02-21 Oxymet Ag Method of manufacturing metallic powder or granules

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3049421A (en) * 1958-08-27 1962-08-14 Nat Res Corp Production of metals
DE1285098B (de) * 1960-04-23 1968-12-12 Heinrich Dr Verfahren und Vorrichtung zum Herstellen insbesondere kugelfoermiger Teilchen aus einer rotierenden, vorzugsweise metallischen Schmelze
US3165396A (en) * 1961-01-09 1965-01-12 Nat Res Corp Deflection of metal vapor away from the vertical in a thermal evaporation process
US3588071A (en) * 1969-10-14 1971-06-28 Homogeneous Metals Apparatus for powdering metals
FR2299932A1 (fr) * 1975-02-07 1976-09-03 Anvar Lithium tres finement divise et son procede de fabrication

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1194444A (en) * 1967-12-15 1970-06-10 Homogeneous Metals Method and Apparatus for making Metal Powders
GB1307553A (en) * 1970-06-06 1973-02-21 Oxymet Ag Method of manufacturing metallic powder or granules

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0175078A2 (fr) * 1984-07-26 1986-03-26 UltraFine Powder Technology, Inc. Procédé et installation pour la production de poudre métallique ultrafine par solidification rapide
EP0175078A3 (en) * 1984-07-26 1987-02-04 George B. Kenney Device and method for production of ultra-fine, rapidly solidified, metal powders

Also Published As

Publication number Publication date
FI850297L (fi) 1985-07-26
FI76716B (fi) 1988-08-31
PL251656A1 (en) 1985-11-05
FI850297A0 (fi) 1985-01-23
CS47285A2 (en) 1990-07-12
DK161571B (da) 1991-07-22
DE3572609D1 (en) 1989-10-05
ATE45897T1 (de) 1989-09-15
AU575518B2 (en) 1988-07-28
ES539751A0 (es) 1986-09-01
NO850274L (no) 1985-07-26
DE3402500C1 (de) 1985-08-01
EP0150755A3 (en) 1987-02-25
ES8608975A1 (es) 1986-09-01
CS273161B2 (en) 1991-03-12
NO164220B (no) 1990-06-05
CA1228458A (fr) 1987-10-27
JPS60221507A (ja) 1985-11-06
PT79874B (en) 1986-09-11
DK161571C (da) 1992-01-06
IL74135A (en) 1988-02-29
PL143335B1 (en) 1988-02-29
JPS6221842B2 (fr) 1987-05-14
DK32685D0 (da) 1985-01-24
IL74135A0 (en) 1985-04-30
IN163942B (fr) 1988-12-10
US4610719A (en) 1986-09-09
SU1563584A3 (ru) 1990-05-07
AU3770085A (en) 1985-08-01
NO164220C (no) 1990-09-12
FI76716C (fi) 1988-12-12
EP0150755B1 (fr) 1989-08-30
BR8500319A (pt) 1985-09-03
DK32685A (da) 1985-07-26
DD232212A5 (de) 1986-01-22
KR900009217B1 (ko) 1990-12-24
KR850005303A (ko) 1985-08-24
PT79874A (en) 1985-02-01
MX162212A (es) 1991-04-08
RO91979B (ro) 1987-07-01
RO91979A (fr) 1987-06-30

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