EP0150755B1 - Verfahren und Vorrichtung zur Herstellung von Metallpulver - Google Patents
Verfahren und Vorrichtung zur Herstellung von Metallpulver Download PDFInfo
- Publication number
- EP0150755B1 EP0150755B1 EP85100339A EP85100339A EP0150755B1 EP 0150755 B1 EP0150755 B1 EP 0150755B1 EP 85100339 A EP85100339 A EP 85100339A EP 85100339 A EP85100339 A EP 85100339A EP 0150755 B1 EP0150755 B1 EP 0150755B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- metal
- gas
- passage
- riser
- molten metal
- 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
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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 according to the preamble of claim 1 and claim 6, respectively.
- the present invention is therefore based on the object of creating a method and a device of the type mentioned or described in GB-A 1 194 444, by means of which the finest metal powder of high uniformity with minimal construction, process engineering and energy expenditure Quality can be produced.
- 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 environment, in particular in an argon environment.
- 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 molten metal is preferably mixed with inert gas to form a metal foam which is “blasted” or divided into fine metal droplets in a pulverization chamber by exposure to likewise inert compressed gas.
- the inert pressurized gas preferably argon, also serves to press the metal droplets out of the pulverization chamber into a closed expansion space, namely a collecting container, through a mouthpiece that preferably converges in the flow direction, so that a so-called secondary division of the metal droplets into even finer, full-density particles takes place.
- 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 division.
- 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, in particular argon preferably also serves as the compressed gas.
- a crucible 3 for receiving a metal or metal-alloy melt is arranged in a gas-tight, closed receiving container 2, which stands on a stable base. Above the crucible 3 there is a riser pipe 7 led out of the receptacle 2.
- the crucible 3 can be raised within the receptacle 2 by means of a hydraulically or hydro-pneumatically or mechanically driven device so that the riser pipe 7 is immersed in the molten metal.
- the lifting device 5 is connected to a lifting table 4 on which the crucible 3 is fastened.
- the riser pipe 7 is closed with a cap-like cover 7a, which is when the riser pipe is immersed res 7 is destroyed 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 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, in particular inert gas, for example argon can be introduced into the receiving container through the gas pressure line 11, with the formation of an internal container pressure which pushes the molten metal in the riser pipe 7 upwards when it is immersed in the molten metal.
- the gas pressure in the interior of the receptacle 2 acts on the free surface of the molten metal.
- 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 mixed 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 through 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 By introducing non-reactive or inert compressed gas into the pulverization chamber 8, the metal foam is atomized or broken down into - to a small extent sometimes also hollow - metal droplets which are still relatively large.
- the compressed gas introduced into the pulverization chamber 8 also serves to blow the metal droplets through a converging 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. As has been explained above, this acceleration can also be achieved by an external ring flow.
- the convergingly narrowing passage 9 is directed obliquely upwards at an angle a 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 used, 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 arranged so that it can be pivoted so that the optimum angle a can be set individually.
- 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 5 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 via the line 13, the annular space 23 and the opening 15 in the upper region of the riser pipe 7 of the ascending molten metal, like argon, mixed in, which creates metal foam.
- the gas is blown into the pulverization chamber 8 and 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. Due to 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, due to 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 breakup forces, the degree of convergence depending on the metal to be pulverized (MetalV metal alloy) and the desired particle size.
Landscapes
- Manufacture Of Metal Powder And Suspensions Thereof (AREA)
- Disintegrating Or Milling (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
- Powder Metallurgy (AREA)
- Float Valves (AREA)
- Heat Treatment Of Sheet Steel (AREA)
- Conductive Materials (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
- Burglar Alarm Systems (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Stored Programmes (AREA)
- Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)
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 EP0150755A2 (de) | 1985-08-07 |
EP0150755A3 EP0150755A3 (en) | 1987-02-25 |
EP0150755B1 true EP0150755B1 (de) | 1989-08-30 |
Family
ID=6225866
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP85100339A Expired EP0150755B1 (de) | 1984-01-25 | 1985-01-15 | Verfahren und Vorrichtung zur Herstellung von Metallpulver |
Country Status (22)
Country | Link |
---|---|
US (1) | US4610719A (pt) |
EP (1) | EP0150755B1 (pt) |
JP (1) | JPS60221507A (pt) |
KR (1) | KR900009217B1 (pt) |
AT (1) | ATE45897T1 (pt) |
AU (1) | AU575518B2 (pt) |
BR (1) | BR8500319A (pt) |
CA (1) | CA1228458A (pt) |
CS (1) | CS273161B2 (pt) |
DD (1) | DD232212A5 (pt) |
DE (2) | DE3402500C1 (pt) |
DK (1) | DK161571C (pt) |
ES (1) | ES8608975A1 (pt) |
FI (1) | FI76716C (pt) |
IL (1) | IL74135A (pt) |
IN (1) | IN163942B (pt) |
MX (1) | MX162212A (pt) |
NO (1) | NO164220C (pt) |
PL (1) | PL143335B1 (pt) |
PT (1) | PT79874B (pt) |
RO (1) | RO91979B (pt) |
SU (1) | SU1563584A3 (pt) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4019563A1 (de) * | 1990-06-15 | 1991-12-19 | Mannesmann Ag | Verfahren zur herstellung von metallpulver |
DE10205897A1 (de) * | 2002-02-13 | 2003-08-21 | Mepura Metallpulver | Verfahren zur Herstellung von partikelförmigem Material |
Families Citing this family (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4626278A (en) * | 1984-07-26 | 1986-12-02 | Kenney George B | Tandem atomization method for ultra-fine metal powder |
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 |
KR100387565B1 (ko) * | 1998-04-13 | 2003-10-10 | 안정오 | 파장전사체의제법 |
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 (en) * | 2019-03-28 | 2020-09-30 | Catalytic Instruments GmbH & Co. KG | Apparatus for the production of nanoparticles and method for producing nanoparticles |
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 |
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 |
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 |
Family Cites Families (7)
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 |
US3510546A (en) * | 1967-12-15 | 1970-05-05 | Homogeneous Metals | Methods for powdering metals |
US3588071A (en) * | 1969-10-14 | 1971-06-28 | Homogeneous Metals | Apparatus for powdering metals |
GB1307553A (en) * | 1970-06-06 | 1973-02-21 | Oxymet Ag | Method of manufacturing metallic powder or granules |
FR2299932A1 (fr) * | 1975-02-07 | 1976-09-03 | Anvar | Lithium tres finement divise et son procede de fabrication |
-
1984
- 1984-01-25 DE DE3402500A patent/DE3402500C1/de not_active Expired
-
1985
- 1985-01-15 DE DE8585100339T patent/DE3572609D1/de not_active Expired
- 1985-01-15 EP EP85100339A patent/EP0150755B1/de not_active Expired
- 1985-01-15 AT AT85100339T patent/ATE45897T1/de not_active IP Right Cessation
- 1985-01-16 CA CA000472211A patent/CA1228458A/en not_active Expired
- 1985-01-16 AU AU37700/85A patent/AU575518B2/en not_active Ceased
- 1985-01-18 IN IN43/MAS/85A patent/IN163942B/en unknown
- 1985-01-21 RO RO117385A patent/RO91979B/ro unknown
- 1985-01-21 KR KR1019850000325A patent/KR900009217B1/ko not_active IP Right Cessation
- 1985-01-22 ES ES539751A patent/ES8608975A1/es not_active Expired
- 1985-01-23 FI FI850297A patent/FI76716C/fi not_active IP Right Cessation
- 1985-01-23 DD DD85272724A patent/DD232212A5/de not_active IP Right Cessation
- 1985-01-23 PL PL1985251656A patent/PL143335B1/pl unknown
- 1985-01-23 IL IL74135A patent/IL74135A/xx unknown
- 1985-01-23 CS CS47285A patent/CS273161B2/cs unknown
- 1985-01-23 NO NO850274A patent/NO164220C/no unknown
- 1985-01-24 BR BR8500319A patent/BR8500319A/pt not_active IP Right Cessation
- 1985-01-24 SU SU853845847A patent/SU1563584A3/ru active
- 1985-01-24 DK DK032685A patent/DK161571C/da not_active IP Right Cessation
- 1985-01-24 JP JP60009970A patent/JPS60221507A/ja active Granted
- 1985-01-25 PT PT79874A patent/PT79874B/pt not_active IP Right Cessation
- 1985-01-25 MX MX204150A patent/MX162212A/es unknown
- 1985-09-24 US US06/779,311 patent/US4610719A/en not_active Expired - Fee Related
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4019563A1 (de) * | 1990-06-15 | 1991-12-19 | Mannesmann Ag | Verfahren zur herstellung von metallpulver |
DE10205897A1 (de) * | 2002-02-13 | 2003-08-21 | Mepura Metallpulver | Verfahren zur Herstellung von partikelförmigem Material |
AU2003206894B2 (en) * | 2002-02-13 | 2008-10-02 | Mepura Metallpulvergesellschaft M.B.H. | Method for producing particle-shaped material |
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