US3646177A - Method for producing powdered metals and alloys - Google Patents

Method for producing powdered metals and alloys Download PDF

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Publication number
US3646177A
US3646177A US31105A US3646177DA US3646177A US 3646177 A US3646177 A US 3646177A US 31105 A US31105 A US 31105A US 3646177D A US3646177D A US 3646177DA US 3646177 A US3646177 A US 3646177A
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United States
Prior art keywords
particles
chamber
liquid
alloys
molten metal
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Expired - Lifetime
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US31105A
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English (en)
Inventor
Vernon R Thompson
Robert W Diehl
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Crucible Materials Corp
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Crucible Inc
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Publication date
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Publication of US3646177A publication Critical patent/US3646177A/en
Assigned to COLT INDUSTRIES OPERATING CORP. reassignment COLT INDUSTRIES OPERATING CORP. MERGER AND CHANGE OF NAME Assignors: CRUCIBLE CENTER COMPANY (INTO) CRUCIBLE INC. (CHANGED TO)
Assigned to CRUCIBLE MATERIALS CORPORATION reassignment CRUCIBLE MATERIALS CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: COLT INDUSTRIES OPERATING CORP.
Assigned to MELLON BANK, N.A. AS AGENT FOR MELLON BANK N.A. & MELLON FINANCIAL SERVICES CORPORATION, MELLON FINANCIAL SERVICES CORPORATION reassignment MELLON BANK, N.A. AS AGENT FOR MELLON BANK N.A. & MELLON FINANCIAL SERVICES CORPORATION SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). 2ND Assignors: CRUCIBLE MATERIALS CORPORATION, A CORP. OF DE.
Assigned to MELLON BANK, N.A. FOR THE CHASE MANHATTAN BANK (NATIONAL ASSOCIATION) AND MELLON BANK N.A., CHASE MANHATTAN BANK, THE (NATIONAL ASSOCIATION) AS AGENT reassignment MELLON BANK, N.A. FOR THE CHASE MANHATTAN BANK (NATIONAL ASSOCIATION) AND MELLON BANK N.A. SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). 1ST Assignors: CRUCIBLE MATERIALS CORPORATION, A CORP. OF DE.
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25C—PRODUCING, WORKING OR HANDLING ICE
    • F25C1/00—Producing ice

Definitions

  • the alloy have constituent metals that are of the highly oxidizable types, such as titanium and zirconium.
  • the molten metal particles produced upon atomization must be quickly cooled to room temperature to prevent them from sintering or agglomerating, which renders them unsuitable for subsequent use in compacting into articles by conventional powder-metallurgy techniques. Cooling that is sufficiently rapid for this purpose can only be achieved conventionally by using a water quench; however, contact with water causes rapid and severe oxidation of the particles.
  • Another more specific object of the invention is to provide for the quenching or cooling of molten atomized particles of molten metal or alloy by the use of an inert cryogenic liquid, such as liquid nitrogen, argon or helium, whereby the particles are rapidly cooled to room temperature and at the same time protected against surface oxidation.
  • an inert cryogenic liquid such as liquid nitrogen, argon or helium
  • the single figure thereof is a vertical section of apparatus suitable for the practice of the method of the invention.
  • a quantity of molten metal or alloy is formed into a stream that is contacted by a fluid jet to atomize the same and thereby form discrete particles.
  • the particles are directed to a collecting chamber having a reservoir of an inert cryogenic liquid, which is preferably nitrogen, but argon and helium may also be used
  • the particles are deposited in the liquid to cool the same, and at the same time they are protected by the inert liquid against oxidation.
  • the fluid jet preferably is an inert gas and the chamber is preferably provided with a nonoxidizing atmosphere, either by evacuation to a subatmospheric pressure or by purging with an inert gas preferably of the cryogenic liquid of the reservoir.
  • the apparatus 10 consists of a closed chamber 12 provided with a reservoir 14 of an inert cryogenic liquid, such as for example liquid nitrogen. Adjacent the base of the chamber 12 is an outlet or drain 16 with an associated valve 18, which when opened will permit drawing of the cryogenic liquid from the chamber. Mounted over the open top of the chamber 12 is a tundish 20 having a central bottom nozzle opening 22.
  • a quantity of molten metal 24 for atomization is poured into the tundish from a ladle or other suitable transport device, not shown.
  • the tundish 20 is in the customary manner lined with a suitable refractory material not shown. With the tundish 20 mounted atop the chamber 12, which is the position shown in the drawing, the chamber 12 is sealed against the atmosphere by O-ring seal 26. In this manner, if the chamber interior is purged by the use of an inert gas or pumped to a subatmospheric pressure, the resulting nonoxidizing atmophere therein may be preserved during subsequent atomization of the molten metal from the tundish.
  • Beneath the top of chamber 12 and extending through the chamber walls and into the interior thereof is a plurality of gas jets 28. The jets 28 are directed toward the axis of the nozzle 22 of the tundish a short distance beneath the end thereof.
  • the tundish 20 is filled with molten metal 24 which emerges in a stream 30 from nozzle 22.
  • An inert gas 32 from gas jets 28 strike the molten metal stream 30 and atomize it into molten metal particles 34.
  • the particles 34 drop to the bottom of the chamber and into the reservoir 14.
  • the cryogenic liquid of the reservoir quickly cools the particles 34 before they can agglomerate and also during cooling protects them against oxidation. Since a non-oxidizing atmosphere is provided within the chamber, the particles are also protected against oxidation during their passage from the tundish nozzle 22 to the reservoir 14. When all the metal in the tundish has been atomized the tundish is removed from the chamber 12 to open it to the atmosphere.
  • valve 18 of drain 16 is opened to drain the cryogenic liquid from the chamber. Any liquid remaining on the particles is subsequently removed by volatilization when the interior of chamber 12 is open to the atmosphere. The cooled powder is then removed from the chamber for subsequent storage and use in compacting of powder-metallurgy products.
  • inert means that the particular cryogenic liquid being used will not have a deleterious efiect on the particular metal or alloy being quenched therein.
  • a method for producing powdered metal and alloys characterized by freedom from oxidation comprising atomizing molten metal with an inert gas jet to form discrete particles thereof, directing said atomized metal particles to a collecting chamber having therein a reservoir of an inert cryogenic liquid, depositing said particles in said liquid to cool said particles, whereby said particles are protected against oxidation by said inert cryogenic liquid during cooling.
  • said inert cryogenic liquid is a liquid selected from the group consisting of nitrogen, argon and helium.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
US31105A 1970-04-23 1970-04-23 Method for producing powdered metals and alloys Expired - Lifetime US3646177A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US3110570A 1970-04-23 1970-04-23

Publications (1)

Publication Number Publication Date
US3646177A true US3646177A (en) 1972-02-29

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ID=21857680

Family Applications (1)

Application Number Title Priority Date Filing Date
US31105A Expired - Lifetime US3646177A (en) 1970-04-23 1970-04-23 Method for producing powdered metals and alloys

Country Status (7)

Country Link
US (1) US3646177A (enrdf_load_stackoverflow)
JP (1) JPS5024713B1 (enrdf_load_stackoverflow)
AT (1) AT307064B (enrdf_load_stackoverflow)
CA (1) CA957117A (enrdf_load_stackoverflow)
DE (1) DE2063779A1 (enrdf_load_stackoverflow)
FR (1) FR2074526A5 (enrdf_load_stackoverflow)
GB (1) GB1287877A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2703169A1 (de) * 1976-01-30 1977-08-11 United Technologies Corp Verfahren und vorrichtung zur herstellung von metallpulver
US4521353A (en) * 1982-05-12 1985-06-04 Institut National De La Recherche Agronomique Process for producing encapsulable globules
US4585473A (en) * 1984-04-09 1986-04-29 Crucible Materials Corporation Method for making rare-earth element containing permanent magnets
US4615736A (en) * 1985-05-01 1986-10-07 Allied Corporation Preparation of metal powders
US4748817A (en) * 1986-10-06 1988-06-07 Taiyo Sanso Co., Ltd. Method and apparatus for producing microfine frozen particles
DE3843859A1 (de) * 1988-12-24 1990-06-28 Messer Griesheim Gmbh Herstellung von titanpulvern durch verduesung der schmelze
DE3913649A1 (de) * 1989-04-26 1991-01-17 Krupp Pulvermetall Gmbh Verfahren und anlage zum herstellen metallischer pulver aus einer metallschmelze durch gasverduesen
US5019400A (en) * 1989-05-01 1991-05-28 Enzytech, Inc. Very low temperature casting of controlled release microspheres
US5143541A (en) * 1989-06-02 1992-09-01 Sugitani Kinzoky Kogyo Kabushiki Kaisha Process for producing powdered metal spray coating material
US5294242A (en) * 1991-09-30 1994-03-15 Air Products And Chemicals Method for making metal powders
US20070051201A1 (en) * 2005-08-25 2007-03-08 Harima Chemicals, Inc. Method of manufacturing the SnZnNiCu solder powder and the SnZnNiCu solder powder
US20080075777A1 (en) * 2006-07-31 2008-03-27 Kennedy Michael T Apparatus and methods for preparing solid particles
US20200001369A1 (en) * 2017-01-27 2020-01-02 Jfe Steel Corporation Method for manufacturing soft magnetic iron powder

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1604019A (en) * 1978-05-31 1981-12-02 Wiggin & Co Ltd Henry Atomisation into a chamber held at reduced pressure
DE3730147A1 (de) * 1987-09-09 1989-03-23 Leybold Ag Verfahren zur herstellung von pulvern aus geschmolzenen stoffen
CN105571230A (zh) * 2016-03-11 2016-05-11 何建东 一种快速液氮制冰装置

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2703169A1 (de) * 1976-01-30 1977-08-11 United Technologies Corp Verfahren und vorrichtung zur herstellung von metallpulver
US4521353A (en) * 1982-05-12 1985-06-04 Institut National De La Recherche Agronomique Process for producing encapsulable globules
US4585473A (en) * 1984-04-09 1986-04-29 Crucible Materials Corporation Method for making rare-earth element containing permanent magnets
US4615736A (en) * 1985-05-01 1986-10-07 Allied Corporation Preparation of metal powders
US4748817A (en) * 1986-10-06 1988-06-07 Taiyo Sanso Co., Ltd. Method and apparatus for producing microfine frozen particles
DE3843859A1 (de) * 1988-12-24 1990-06-28 Messer Griesheim Gmbh Herstellung von titanpulvern durch verduesung der schmelze
DE3913649A1 (de) * 1989-04-26 1991-01-17 Krupp Pulvermetall Gmbh Verfahren und anlage zum herstellen metallischer pulver aus einer metallschmelze durch gasverduesen
US5019400A (en) * 1989-05-01 1991-05-28 Enzytech, Inc. Very low temperature casting of controlled release microspheres
US5143541A (en) * 1989-06-02 1992-09-01 Sugitani Kinzoky Kogyo Kabushiki Kaisha Process for producing powdered metal spray coating material
US5294242A (en) * 1991-09-30 1994-03-15 Air Products And Chemicals Method for making metal powders
US20070051201A1 (en) * 2005-08-25 2007-03-08 Harima Chemicals, Inc. Method of manufacturing the SnZnNiCu solder powder and the SnZnNiCu solder powder
EP1757400A3 (en) * 2005-08-25 2008-07-23 Harima Chemicals, Inc. Method of manufacturing SnZnNiCu solder powder by gas atomization, and solder powder
US7503958B2 (en) 2005-08-25 2009-03-17 Harima Chemicals, Inc. Method of manufacturing the SnZnNiCu solder powder and the SnZnNiCu solder powder
US20080075777A1 (en) * 2006-07-31 2008-03-27 Kennedy Michael T Apparatus and methods for preparing solid particles
US20200001369A1 (en) * 2017-01-27 2020-01-02 Jfe Steel Corporation Method for manufacturing soft magnetic iron powder

Also Published As

Publication number Publication date
FR2074526A5 (enrdf_load_stackoverflow) 1971-10-01
DE2063779A1 (enrdf_load_stackoverflow) 1972-05-25
JPS5024713B1 (enrdf_load_stackoverflow) 1975-08-18
CA957117A (en) 1974-11-05
AT307064B (de) 1973-05-10
GB1287877A (enrdf_load_stackoverflow) 1972-09-06

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Free format text: MERGER AND CHANGE OF NAME;ASSIGNOR:CRUCIBLE CENTER COMPANY (INTO) CRUCIBLE INC. (CHANGED TO);REEL/FRAME:004120/0308

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Free format text: SECURITY INTEREST;ASSIGNOR:CRUCIBLE MATERIALS CORPORATION, A CORP. OF DE.;REEL/FRAME:004490/0410

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