US3829538A - Control method and apparatus for the production of powder metal - Google Patents

Control method and apparatus for the production of powder metal Download PDF

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Publication number
US3829538A
US3829538A US00294747A US29474772A US3829538A US 3829538 A US3829538 A US 3829538A US 00294747 A US00294747 A US 00294747A US 29474772 A US29474772 A US 29474772A US 3829538 A US3829538 A US 3829538A
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United States
Prior art keywords
metal
electrodes
electrode
stream
liquid metal
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Expired - Lifetime
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US00294747A
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English (en)
Inventor
F Darmara
I Clark
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.)
ALLEGHENY INTERNATIONAL ACCEPTANCE Corp
Special Metals Corp
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Special Metals Corp
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 Special Metals Corp filed Critical Special Metals Corp
Priority to US00294747A priority Critical patent/US3829538A/en
Priority to GB4599573A priority patent/GB1393185A/en
Priority to SE7313485A priority patent/SE399190B/xx
Priority to CA182,591A priority patent/CA1006317A/en
Priority to DE2349742A priority patent/DE2349742C2/de
Priority to JP48110640A priority patent/JPS4993257A/ja
Priority to FR7335394A priority patent/FR2201148B1/fr
Application granted granted Critical
Publication of US3829538A publication Critical patent/US3829538A/en
Assigned to CITICORP INDUSTRIAL CREDIT, INC., BOND COURT BLDG., STE. 615, 1300 E. 9TH ST., CLEVELAND, OH. 44114 reassignment CITICORP INDUSTRIAL CREDIT, INC., BOND COURT BLDG., STE. 615, 1300 E. 9TH ST., CLEVELAND, OH. 44114 SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SPECIAL METALS CORPORATION
Assigned to AL-INDUSTRIAL PRODUCTS, INC. reassignment AL-INDUSTRIAL PRODUCTS, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SPECIAL METALS CORPORATION A DE CORP
Assigned to ALLEGHENY INTERNATIONAL ACCEPTANCE CORPORATION reassignment ALLEGHENY INTERNATIONAL ACCEPTANCE CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: AL- INDUSTRIAL PRODUCTS INC.
Assigned to HELLER FINANCIAL, INC. reassignment HELLER FINANCIAL, INC. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SPECIAL METALS CORPORATION
Assigned to SPECIAL METALS CORPORATION reassignment SPECIAL METALS CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: CITICORP INDUSTRIAL CREDIT, INC.
Assigned to SPECIAL METALS CORPORATION reassignment SPECIAL METALS CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: AL-INDUSTRIAL PRODUCTS, INC., A CORP. OF PA, ALLEGHENY INTERNATIONAL, INC., A CORP. OF PA
Assigned to SPECIAL METALS CORPORATION reassignment SPECIAL METALS CORPORATION RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: HELLER FINANCIAL, INC.
Anticipated expiration legal-status Critical
Assigned to CREDIT LYONNAIS NEW YORK BRANCH reassignment CREDIT LYONNAIS NEW YORK BRANCH SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SPECIAL METALS CORPORATION
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
    • 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
    • B22F9/10—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 using centrifugal force
    • 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
    • B22F2009/0848—Melting process before atomisation
    • 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
    • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy

Definitions

  • the present invention relates to a method of control and control apparatus for the production of metallic powder using ingots of pre-alloyed metal as consumable electrodes.
  • the grains of the consumable electrode grow inwardly during their solidification and drive the low melting point constituents, elements and compounds along with them, thereby setting up a degree of segregation within the electrodes. This degree of segregation is more prominent in superalloys although troublesome with many other alloys used in powder metallurgy.
  • the lack of homogeneous properties. in the liquid metal droplets has been overcome by providing a shallow reservoir for holding a volume of molten metal sufficient to provide a metallurgically homogeneous metal stream which is then delivered to an atomizing station for the production of the metallic powder.
  • the control is based on adjustments of the power input to two consumable electrodes to control the melting rate thereof. Concurrently, adjustment is made to the position of the electrodes to maintain an arc gap for continuous melting of the electrode. This can be accomplished, for example, by an arc voltage control system.
  • a method of producing pre-alloyed metallic powder comprising the steps of providing at least one electrode having a composition corresponding to the desired metallurgical composition of the powder to be ultimately produced, striking an arc to melt the consumable electrode in a controlled atmosphere and without the formation of any substantial slag, controlling the rate of continuous melting of the consumable electrode by power input adjustments on the basis of a desired flow rate of the molten metal to the atomization means, collecting the molten metal in a reservoir, holding the mo]- ten metal in the reservoir for a period of time sufficient to homogenize it, atomizing the homogenized metal passing from the reservoir, and cooling the atomized metal in a chamber having a controlled atmosphere.
  • the method according to the present invention additionally provides the step of adjusting the arc gap between the electrodes to maintain desired arc conditions therebetween for continuous melting of the consumable electrode.
  • An important feature of the invention is to provide a system for controlling the melting rate in a consumable electrode melting process wherein the melting rate is very accurately controlled and adjusted to match a predetermined flow rate of the molten metal supply to the atomization means by adjustments of the power inputs to the consumable electrodes.
  • An electrode gap adjustment circuit based on arc voltage or the like, may be concurrently operated to maintain the gap between electrodes at a desired dimension to provide a continuous delivery of liquid metal droplets from the consumable electrode.
  • FIG. 1 is a schematic view of one embodiment of the melting means of the powder making system of the present invention
  • FIG. 2 is a schematic view of another embodiment of the melting means of the powder making system of the invention.
  • FIG. 3 is a schematic view of the preferred embodiment of the invention including the preferred melting means, atomization means and powder collecting means.
  • a tundish 10 having a heating source (e.g., an induction coil 11) for preheating the tundish to prevent premature freezing of liquid metal passing into it from consumable electrode 52 and fluid cooled non-consumable stool 54.
  • the tundish also includes a skimmer wall 14 to prevent the outflow of impurities which may be floating on the metal surface in the tundish. Molten metal passes from'the tundish through a runner channel 15 to the atomization apparatus, which in the embodiment shown (FIG. 3) is a rotating drum (hereinafter discussed).
  • this electrode is formed from an ingot of prealloyed metal corresponding in composition to that of the ultimate powder to be produced.
  • a non-consumable fluid cooled stool 54 In this embodiment, the electrode and stool are connected by transmission lines and 31, respectively, to a power supply 32 and potentiometer 33 having a slide wire 34 which is manually set to vary the power delivered from the supply 32 to the electrode and the stool.
  • the electrode 52 is contained within an evacuated chamber 51 within which it is supported vertically by means of supp'ort rod assembly 53. This support rod assembly 53 permits adjusting the position of the electrode to strike an are on the non-consumable stool 54.
  • a skimmer wall 14 prevents the outflowing of slag or other impurities whichmay float upon the surface of the metal.
  • the runner directs the liquid metal to the atomization apparatus.
  • FIG. 2 illustrates the same embodiment of FIG. 1, except for a different runner or pouring nozzle 59 which receives molten metal from stool 58 and directs the molten metal to the atomization apparatus.
  • Pouring nozzle 59 may be heated by means of the electrical resistance or induction coils 60.
  • the use of the stool 54 in the embodiment of FIG. 1 and stool 58 according to the embodiment of FIG. 2 provides an immediate shallow pool area for collecting liquid metal droplets from the electrodes.
  • the depth of the pool is selected for optimum temperature of the metal flowing from the stool. This depth is usually less than one-third the diameter of the electrode 52.
  • an embodiment which includes two consumable electrodes 12 and 13 in the preferred form. These electrodes are formed from ingots of pre-alloyed metal corresponding in composition to that of the ultimate powder to be continuously produced.
  • the electrodes are connected by electrical transmission lines 30 and 31, respectively, to a polarity reversing switch 71 and through other electrical transmission lines 73 and 74, respectively, to power supply 32.
  • a potentiometer 33 having a slide wire 34 is manually set to vary the power delivered from the supply 32 to the electrodes.
  • a sight glass 35 1 is provided in the housing for viewing the arc gap between the electrodes which are adjusted to continually maintain a predetermined arc gap by hydraulic drives 36 and 37.
  • Lines 38a and 38b connect the hydraulic drives to a servo system which is controlled by an electrode position control 39 through the lines 40a and 46b. Electrodes l2 and 13 are oscillated at least about 180 in opposite directions by means of motors 69 and 70. Oscillation speed is controlled through a timer, not
  • the apparatus is placed in operation by adjusting the relative position of the consumable electrodes 12 and 13 through the operation of hydraulic drives 36 and 37 to obtain proper spacing for striking an electric arc.
  • Current passes through the lines 30 and 31 in order to strike an arc and melt the electrodes.
  • Proper spacing and centering of the electrodes is maintained by the electrode position control 39 as the electrodes are continuously consumed.
  • the electrodes 12 and 13 are continually oscillated by means of motors 69 and 70 to insure uniform burn-off across the opposing faces of the electrodes during the melting process. The character of the arc is observed through the sight ports 35.
  • the polarities of the electrodes are preferably changed periodically by means of polarity reversing switch 71.
  • Mo]- ten metal from the electrodes is collected to form a pool of liquid metal and homogenize it in tundish 10, which may be similar to that described in the embodiment of FIG. 1.
  • the metal from tundish 10 flows under skimmer 14 and through nozzle 15 onto the atomizing wheel or drum 16. The remainder of the process is identical with that described in the embodiment of FIG.
  • the metal discharged by the runner channel 15 in a continuous and controlled flow impinges upon the outer surface of a drum 16 having bearing mounted shafts 16a extending horizontally and connected to a drive motor 1612. It is preferred to form the peripheral surface of the drum with projecting teeth or vanes which are water cooled and which may be replaceable.
  • the stream of liquid metal impinges upon the surface of the drum, it is atomized into a spray of liquid metal which passes through a movable shield 17 into a chamber 18 where the metal solidifies into a powdered form that is collected on a transfer surface of a vibrator conveyor 19.
  • the chamber 18 as well as the space surrounding electrodes 12 and 13 and tundish 10 is evacuated or otherwise provided with a controlled non-oxidizing atmosphere.
  • the temperature of the powdered metal on the conveyor must fall below a temperature at which there occurs a latent heat of fusion and superheat of the solidified metal so as to avoid impairing the quality and particle size of the metal powder. This is accomplished by controlling the supply and flow of liquid metal through potentiometer 33 as aforesaid, entering the holding chamber II.
  • a sight glass 21 is provided in the end wall of the chamber for viewing the stream of metal discharged from the runner 15 onto the peripheral surface of the drum 16.
  • the volume of liquid metal entering the holding chamber may be adjusted and controlled according to the stream of metal flowing from the runner 15 and to coincide with the optimum atomization rate for the equipment used.
  • a disc may be used which is arranged for receiving a stream of metal on its upper horizontal surface and atomizing it.
  • a plasma gun may be used to atomize the liquid metal or an. argon nozzle may be used.
  • the electrodes and the atomization means are in a vacuum or in a controlled nonoxidizing atmosphere.
  • a method of producing pre-alloyed metal powder with atomization means comprising the steps of,
  • the method of claim 2 including the step of rotating at least one of said electrodes about its axis to insure uniform burn-off during the melting process.
  • An apparatus for producing pre-alloyed metal powder comprising,
  • first and second electrodes forming a gap within said enclosed chamber for striking an arc therein, at least one of said electrodes being an ingot of prealloyed metal corresponding to the composition of the pre-alloyed metal powder to be ultimately formed,
  • a power supply connected to said electrodes to melt the electrode of pre-alloyed metal without the formation of any substantial slag
  • electrode position control means including a drive for adjusting said gap to maintain an are between said electrodes
  • a liquid metal holding chamber in said enclosed chamber for collecting and homogenizing the mo]- ten pre-alloyed metal from at least one of said electrodes, said holding chamber providing a continuous stream of said homogenized molten pre-alloyed metal,
  • said means for adjusting the power comprises a manually adjustable rheostat.
  • said electrode position control means receives a signal proportional to the power delivered from said supply to said electrodes to maintain continuous melting thereof.

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  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
US00294747A 1972-10-03 1972-10-03 Control method and apparatus for the production of powder metal Expired - Lifetime US3829538A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
US00294747A US3829538A (en) 1972-10-03 1972-10-03 Control method and apparatus for the production of powder metal
GB4599573A GB1393185A (en) 1972-10-03 1973-10-02 Control method and apparatus for the production of pwder metal
SE7313485A SE399190B (sv) 1972-10-03 1973-10-03 Forfarande och anordning for framstellning av forlegerat metallpulver
CA182,591A CA1006317A (en) 1972-10-03 1973-10-03 Control method and apparatus for the production of powder metal
DE2349742A DE2349742C2 (de) 1972-10-03 1973-10-03 Verfahren zum Herstellen von vorlegiertem Metallpulver
JP48110640A JPS4993257A (enrdf_load_stackoverflow) 1972-10-03 1973-10-03
FR7335394A FR2201148B1 (enrdf_load_stackoverflow) 1972-10-03 1973-10-03

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00294747A US3829538A (en) 1972-10-03 1972-10-03 Control method and apparatus for the production of powder metal

Publications (1)

Publication Number Publication Date
US3829538A true US3829538A (en) 1974-08-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
US00294747A Expired - Lifetime US3829538A (en) 1972-10-03 1972-10-03 Control method and apparatus for the production of powder metal

Country Status (7)

Country Link
US (1) US3829538A (enrdf_load_stackoverflow)
JP (1) JPS4993257A (enrdf_load_stackoverflow)
CA (1) CA1006317A (enrdf_load_stackoverflow)
DE (1) DE2349742C2 (enrdf_load_stackoverflow)
FR (1) FR2201148B1 (enrdf_load_stackoverflow)
GB (1) GB1393185A (enrdf_load_stackoverflow)
SE (1) SE399190B (enrdf_load_stackoverflow)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4036568A (en) * 1973-12-07 1977-07-19 Creusot-Loire Machines for manufacture of powders
US4127158A (en) * 1973-10-15 1978-11-28 Toyo Kohan Co., Ltd. Process for preparing hollow metallic bodies
US4295808A (en) * 1975-06-28 1981-10-20 Leybold-Heraeus Gmbh & Co. Kg Apparatus for the production of high-purity metal powder by means of electron beam heating
US4358415A (en) * 1979-01-09 1982-11-09 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method for producing granules from molten metallurgical slags
US4373883A (en) * 1979-01-09 1983-02-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for producing granules from molten metallurgical slags
US4474604A (en) * 1982-04-30 1984-10-02 Hitachi Metals, Ltd. Method of producing high-grade metal or alloy powder
US4582116A (en) * 1980-12-29 1986-04-15 Allied Corporation Extraction method for filament formation of high temperature reactive alloys
US4592781A (en) * 1983-01-24 1986-06-03 Gte Products Corporation Method for making ultrafine metal powder
US4731517A (en) * 1986-03-13 1988-03-15 Cheney Richard F Powder atomizing methods and apparatus
US4886547A (en) * 1986-09-19 1989-12-12 Nippon Kokan Kabushiki Kaisha Powder manufacturing apparatus and method therefor
EP0134808B1 (en) * 1983-01-24 1990-09-12 Gte Products Corporation Method for making ultrafine metal powder
US5272718A (en) * 1990-04-09 1993-12-21 Leybold Aktiengesellschaft Method and apparatus for forming a stream of molten material
US5284329A (en) * 1991-01-25 1994-02-08 Leybold Alktiengesellschaft System for the production of powders from metals
US5372224A (en) * 1992-02-07 1994-12-13 Fichtel & Sachs Ag Oscillation damper
US5708677A (en) * 1995-04-21 1998-01-13 Sandia Corporation Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting
US20030230554A1 (en) * 2002-06-12 2003-12-18 Nanotechnologies, Inc. Radial pulsed arc discharge gun for synthesizing nanopowders
CN110961646A (zh) * 2019-11-07 2020-04-07 深圳航科新材料有限公司 金属粉末及其制备方法

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3144481C2 (de) * 1981-11-09 1987-02-05 Holm 4600 Dortmund Krüger Verfahren und Vorrichtung zur Herstellung von metallischen Strahlmitteln, insbesondere auf Eisenbasis, mit temperatur- und korngrößengesteuerter Erstarrung
DE3211861A1 (de) * 1982-03-31 1983-10-06 Leybold Heraeus Gmbh & Co Kg Verfahren und vorrichtung zur herstellung von hochreinen keramikfreien metallpulvern
GB2142046B (en) * 1983-06-23 1987-01-07 Gen Electric Method and apparatus for making alloy powder
JPS6070110A (ja) * 1983-09-27 1985-04-20 Ishikawajima Harima Heavy Ind Co Ltd 球状金属粉末の製造装置
JPS6143230U (ja) * 1984-08-17 1986-03-20 石川島播磨重工業株式会社 金属粉の製造装置
JPS6152308A (ja) * 1984-08-17 1986-03-15 Ishikawajima Harima Heavy Ind Co Ltd 金属粉の製造方法
JPS61223109A (ja) * 1985-03-28 1986-10-03 Dia Shinku Giken Kk 超微粒子製造方法及び装置

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US2189387A (en) * 1938-03-05 1940-02-06 Haynes Stellite Co Method of making hard compositions
US2310635A (en) * 1941-09-27 1943-02-09 Kellogg M W Co Metal fusing apparatus
US2897539A (en) * 1957-03-25 1959-08-04 Titanium Metals Corp Disintegrating refractory metals
US3021562A (en) * 1957-04-01 1962-02-20 Dow Chemical Co Production of group iv, subgroup a, metal prills
GB972305A (en) * 1960-06-13 1964-10-14 Schloemann Ag Continuous system for fabricating metal products
US3099041A (en) * 1961-03-08 1963-07-30 Nuclear Metals Inc Method and apparatus for making powder
DE1184902B (de) * 1961-08-25 1965-01-07 Heraeus Gmbh W C Verfahren und Einrichtung zum Schmelzen von Metall mittels Elektronenstrahlen
DE2012213C3 (de) * 1970-03-14 1975-03-27 Leybold-Heraeus Gmbh & Co Kg, 5000 Koeln Verfahren und Vorrichtung zur Herstellung von Pellets mittels Ladungsträgerstrahlen
GB1353517A (en) * 1970-07-17 1974-05-22 Whittaker Corp Production of pure spherical powders
US3646175A (en) * 1970-09-21 1972-02-29 Rmi Co Method and apparatus for converting miscellaneous pieces of reactive metals to a usable form
GB1322986A (en) * 1970-12-04 1973-07-11 Atomic Energy Authority Uk Finely divided metals

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4127158A (en) * 1973-10-15 1978-11-28 Toyo Kohan Co., Ltd. Process for preparing hollow metallic bodies
US4036568A (en) * 1973-12-07 1977-07-19 Creusot-Loire Machines for manufacture of powders
US4295808A (en) * 1975-06-28 1981-10-20 Leybold-Heraeus Gmbh & Co. Kg Apparatus for the production of high-purity metal powder by means of electron beam heating
US4358415A (en) * 1979-01-09 1982-11-09 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Method for producing granules from molten metallurgical slags
US4373883A (en) * 1979-01-09 1983-02-15 Ishikawajima-Harima Jukogyo Kabushiki Kaisha Apparatus for producing granules from molten metallurgical slags
US4582116A (en) * 1980-12-29 1986-04-15 Allied Corporation Extraction method for filament formation of high temperature reactive alloys
US4474604A (en) * 1982-04-30 1984-10-02 Hitachi Metals, Ltd. Method of producing high-grade metal or alloy powder
EP0134808B1 (en) * 1983-01-24 1990-09-12 Gte Products Corporation Method for making ultrafine metal powder
US4592781A (en) * 1983-01-24 1986-06-03 Gte Products Corporation Method for making ultrafine metal powder
US4731517A (en) * 1986-03-13 1988-03-15 Cheney Richard F Powder atomizing methods and apparatus
US4886547A (en) * 1986-09-19 1989-12-12 Nippon Kokan Kabushiki Kaisha Powder manufacturing apparatus and method therefor
US5272718A (en) * 1990-04-09 1993-12-21 Leybold Aktiengesellschaft Method and apparatus for forming a stream of molten material
DE4102101C2 (de) * 1991-01-25 2003-12-18 Ald Vacuum Techn Ag Einrichtung zum Herstellen von Pulvern aus Metallen
US5284329A (en) * 1991-01-25 1994-02-08 Leybold Alktiengesellschaft System for the production of powders from metals
US5372224A (en) * 1992-02-07 1994-12-13 Fichtel & Sachs Ag Oscillation damper
US5708677A (en) * 1995-04-21 1998-01-13 Sandia Corporation Arc voltage distribution skewness as an indicator of electrode gap during vacuum arc remelting
US20030230554A1 (en) * 2002-06-12 2003-12-18 Nanotechnologies, Inc. Radial pulsed arc discharge gun for synthesizing nanopowders
US6777639B2 (en) * 2002-06-12 2004-08-17 Nanotechnologies, Inc. Radial pulsed arc discharge gun for synthesizing nanopowders
US20050000950A1 (en) * 2002-06-12 2005-01-06 Nanotechnologies, Inc. Radial pulsed arc discharge gun for synthesizing nanopowders
US7126081B2 (en) 2002-06-12 2006-10-24 Nanotechnologies, Inc. Radial pulsed arc discharge gun for synthesizing nanopowders
CN110961646A (zh) * 2019-11-07 2020-04-07 深圳航科新材料有限公司 金属粉末及其制备方法
CN110961646B (zh) * 2019-11-07 2023-08-04 深圳航科新材料有限公司 金属粉末及其制备方法

Also Published As

Publication number Publication date
DE2349742C2 (de) 1984-02-02
DE2349742A1 (de) 1974-04-11
GB1393185A (en) 1975-05-07
CA1006317A (en) 1977-03-08
FR2201148B1 (enrdf_load_stackoverflow) 1979-10-19
SE399190B (sv) 1978-02-06
JPS4993257A (enrdf_load_stackoverflow) 1974-09-05
FR2201148A1 (enrdf_load_stackoverflow) 1974-04-26

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