EP0256450B1 - Procédé de fabrication d'ébauches compactées à résistance élevée et densité relativement faible à partir d'un alliage d'aluminium résistant à la chaleur - Google Patents

Procédé de fabrication d'ébauches compactées à résistance élevée et densité relativement faible à partir d'un alliage d'aluminium résistant à la chaleur Download PDF

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Publication number
EP0256450B1
EP0256450B1 EP87111463A EP87111463A EP0256450B1 EP 0256450 B1 EP0256450 B1 EP 0256450B1 EP 87111463 A EP87111463 A EP 87111463A EP 87111463 A EP87111463 A EP 87111463A EP 0256450 B1 EP0256450 B1 EP 0256450B1
Authority
EP
European Patent Office
Prior art keywords
powder
heat
aluminium alloy
relatively low
low density
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 - Lifetime
Application number
EP87111463A
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German (de)
English (en)
Other versions
EP0256450A1 (fr
Inventor
Malcolm James Dr. Couper
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.)
BBC Brown Boveri AG Switzerland
Original Assignee
BBC Brown Boveri AG Switzerland
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Filing date
Publication date
Application filed by BBC Brown Boveri AG Switzerland filed Critical BBC Brown Boveri AG Switzerland
Publication of EP0256450A1 publication Critical patent/EP0256450A1/fr
Application granted granted Critical
Publication of EP0256450B1 publication Critical patent/EP0256450B1/fr
Anticipated expiration legal-status Critical
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
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/04—Making non-ferrous alloys by powder metallurgy
    • C22C1/0408—Light metal alloys
    • C22C1/0416—Aluminium-based alloys

Definitions

  • Heat-resistant aluminum alloys which are made from powders obtained at high cooling rates by atomizing a melt. High content of alloy components not permitted under the usual solidification conditions, e.g. Fe and Cr.
  • the invention relates to the production of aluminum alloy powders and the production of moldings from these powders.
  • Aluminum alloys which are suitable for the production of powders from melts by means of gas jet atomization using very high cooling speeds (10 ° C./s and more) and can be used for the production of heat-resistant workpieces, have become known in numerous variations.
  • An important group are the polynary alloys of the type Al / Fe / X, which usually have relatively high iron contents, where X denotes at least one of the elements Ti, Zr, Hf, V, Nb, Cr, Mo, W.
  • the shape and size distribution of the powder particles play an important role in the production of compacts.
  • the result is closely related to the gaseous atomizing agent used.
  • Spherical powders result in low mechanical strength when compressed into green compacts, since the particles are only slightly deformed. At the same time, however, the density is relatively high, which makes it difficult to degas and expel unwanted foreign substances during further processing. In contrast, non-spherical powders provide green bodies of high strength combined with low density. However, the content of substances to be degassed (oxygen, water, hydrogen) is high.
  • the invention has for its object to provide a method for producing an aluminum alloy powder by atomizing a melt, which provides a green compact with the highest possible strength and at the same time low relative density (based on the theoretical maximum value of 100%) during compression.
  • the melt was atomized in a device by means of a gas stream to a powder with a maximum particle diameter of 50 ⁇ m.
  • Inert gases nitrogen, argon
  • oxygen oxygen
  • Example II Analogously to Example I, the melt was atomized into a powder in various ways and subsequently compacted. Samples for determining the compressive strength and the relative density were worked out from the compact. The results are as follows:
  • the green pressed bodies of the above exemplary embodiments were also subjected to a degassing process. It was found that the degassing times of the powders produced with inert atomizing gas with the addition of oxygen were between those with inert atomizing gas and those with air. Before the final thermomechanical treatment (hot pressing, extrusion), in which they reach their full, 100% density, the green pressed bodies should advantageously be degassed at a temperature of 350 to 400 ° C. for 1 to 10 hours.
  • the atomizing gas can be an inert gas such as nitrogen, argon or helium, to which 0.5 to 2% by volume of oxygen is added. It can also be a mixture of at least two of the aforementioned gases.
  • the method is preferably carried out in such a way that in the first step (atomization in the gas stream) a powder is produced which contains relatively small proportions of coarser, non-spherical particles and comparatively high proportions of fine spherical particles.
  • This can be achieved by a suitable choice of the gas composition, in particular the addition of oxygen.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
  • Materials For Medical Uses (AREA)
  • Dental Preparations (AREA)

Claims (4)

1. Procédé de la métallurgie des poudres pour la fabrication d'une ébauche compactée crue à résistance élevée et densité relative faible, rapportée à l'état non poreux, à partir d'un alliage d'aluminium résistant à chaud du type Al/Fe/X ou Al/Cr/X, dans lequel X peut être = Ti, Ce, Zr, Hf, V, Nb, Cr, Mo, W, caractérisé en ce que l'on pulvérise un bain de cet alliage en fines particules au moyen d'un jet de gaz constitué par un gaz inerte auquel on a mélangé 0,5 à 2% en volume d'oxygène, et en ce que l'on soumet à un compactage la poudre ainsi produite.
2. Procédé suivant la revendication 1, caractérisé en ce qu'en guise de gaz inerte, on utilise l'azote, l'argon, l'hélium ou un mélange d'au moins deux de ces gaz.
3. Procédé suivant la revendication 1, caractérisé en ce que, dans la première étape, on produit une poudre qui contient des fractions relativement faibles de plus grosses particules non sphériques et des fractions relativement élevées de plus fines particules sphériques.
4. Procédé suivant la revendication 1, caractérisé en ce que l'on dégaze l'ébauche compactée crue pendant 1 à 10 h à une température de 350 à 400°C.
EP87111463A 1986-08-12 1987-08-07 Procédé de fabrication d'ébauches compactées à résistance élevée et densité relativement faible à partir d'un alliage d'aluminium résistant à la chaleur Expired - Lifetime EP0256450B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH3230/86A CH673240A5 (fr) 1986-08-12 1986-08-12
CH3230/86 1986-08-12

Publications (2)

Publication Number Publication Date
EP0256450A1 EP0256450A1 (fr) 1988-02-24
EP0256450B1 true EP0256450B1 (fr) 1991-01-30

Family

ID=4251456

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87111463A Expired - Lifetime EP0256450B1 (fr) 1986-08-12 1987-08-07 Procédé de fabrication d'ébauches compactées à résistance élevée et densité relativement faible à partir d'un alliage d'aluminium résistant à la chaleur

Country Status (7)

Country Link
US (2) US4758405A (fr)
EP (1) EP0256450B1 (fr)
JP (1) JPS6347304A (fr)
CH (1) CH673240A5 (fr)
DE (1) DE3767807D1 (fr)
DK (1) DK415687A (fr)
NO (1) NO873364L (fr)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH673240A5 (fr) * 1986-08-12 1990-02-28 Bbc Brown Boveri & Cie
EP0451093A1 (fr) * 1990-04-04 1991-10-09 Alusuisse-Lonza Services Ag Composite métallique à point de fusion élevé
US5114470A (en) * 1990-10-04 1992-05-19 The United States Of America As Represented By The Secretary Of Commerce Producing void-free metal alloy powders by melting as well as atomization under nitrogen ambient
JPH0625782A (ja) * 1991-04-12 1994-02-01 Hitachi Ltd 高延性アルミニウム焼結合金とその製造法及びその用途
JP2790935B2 (ja) * 1991-09-27 1998-08-27 ワイケイケイ株式会社 アルミニウム基合金集成固化材並びにその製造方法
US5368657A (en) * 1993-04-13 1994-11-29 Iowa State University Research Foundation, Inc. Gas atomization synthesis of refractory or intermetallic compounds and supersaturated solid solutions
US6010583A (en) * 1997-09-09 2000-01-04 Sony Corporation Method of making unreacted metal/aluminum sputter target
US8603213B1 (en) 2006-05-08 2013-12-10 Iowa State University Research Foundation, Inc. Dispersoid reinforced alloy powder and method of making
US7699905B1 (en) 2006-05-08 2010-04-20 Iowa State University Research Foundation, Inc. Dispersoid reinforced alloy powder and method of making
US20090263273A1 (en) * 2008-04-18 2009-10-22 United Technologies Corporation High strength L12 aluminum alloys
US8778098B2 (en) * 2008-12-09 2014-07-15 United Technologies Corporation Method for producing high strength aluminum alloy powder containing L12 intermetallic dispersoids
US20100143177A1 (en) * 2008-12-09 2010-06-10 United Technologies Corporation Method for forming high strength aluminum alloys containing L12 intermetallic dispersoids
US8778099B2 (en) * 2008-12-09 2014-07-15 United Technologies Corporation Conversion process for heat treatable L12 aluminum alloys
EP2383358A4 (fr) * 2009-01-28 2018-08-15 Korea Automotive Technology Institute Alliage d'aluminium thermorésistant et procédé de fabrication correspondant
US20100226817A1 (en) * 2009-03-05 2010-09-09 United Technologies Corporation High strength l12 aluminum alloys produced by cryomilling
US20100252148A1 (en) * 2009-04-07 2010-10-07 United Technologies Corporation Heat treatable l12 aluminum alloys
US20100254850A1 (en) * 2009-04-07 2010-10-07 United Technologies Corporation Ceracon forging of l12 aluminum alloys
US9611522B2 (en) * 2009-05-06 2017-04-04 United Technologies Corporation Spray deposition of L12 aluminum alloys
US9127334B2 (en) * 2009-05-07 2015-09-08 United Technologies Corporation Direct forging and rolling of L12 aluminum alloys for armor applications
US20110044844A1 (en) * 2009-08-19 2011-02-24 United Technologies Corporation Hot compaction and extrusion of l12 aluminum alloys
US8728389B2 (en) * 2009-09-01 2014-05-20 United Technologies Corporation Fabrication of L12 aluminum alloy tanks and other vessels by roll forming, spin forming, and friction stir welding
US8409496B2 (en) * 2009-09-14 2013-04-02 United Technologies Corporation Superplastic forming high strength L12 aluminum alloys
US20110064599A1 (en) * 2009-09-15 2011-03-17 United Technologies Corporation Direct extrusion of shapes with l12 aluminum alloys
US9194027B2 (en) * 2009-10-14 2015-11-24 United Technologies Corporation Method of forming high strength aluminum alloy parts containing L12 intermetallic dispersoids by ring rolling
US20110091346A1 (en) * 2009-10-16 2011-04-21 United Technologies Corporation Forging deformation of L12 aluminum alloys
US20110091345A1 (en) * 2009-10-16 2011-04-21 United Technologies Corporation Method for fabrication of tubes using rolling and extrusion
US8409497B2 (en) * 2009-10-16 2013-04-02 United Technologies Corporation Hot and cold rolling high strength L12 aluminum alloys

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2967351A (en) * 1956-12-14 1961-01-10 Kaiser Aluminium Chem Corp Method of making an aluminum base alloy article
US3462248A (en) * 1956-12-14 1969-08-19 Kaiser Aluminium Chem Corp Metallurgy
US2963780A (en) * 1957-05-08 1960-12-13 Aluminum Co Of America Aluminum alloy powder product
DE1758844A1 (de) * 1968-08-19 1971-03-04 Gerliwanow Wadim G Verfahren zum Gewinnen von feindispersen Metall- und Legierungspulvern
US3954458A (en) * 1973-11-12 1976-05-04 Kaiser Aluminum & Chemical Corporation Degassing powder metallurgical products
US4347076A (en) * 1980-10-03 1982-08-31 Marko Materials, Inc. Aluminum-transition metal alloys made using rapidly solidified powers and method
US4647321A (en) * 1980-11-24 1987-03-03 United Technologies Corporation Dispersion strengthened aluminum alloys
US4464199A (en) * 1981-11-20 1984-08-07 Aluminum Company Of America Aluminum powder alloy product for high temperature application
US4435213A (en) * 1982-09-13 1984-03-06 Aluminum Company Of America Method for producing aluminum powder alloy products having improved strength properties
DE3481322D1 (de) * 1983-12-02 1990-03-15 Sumitomo Electric Industries Aluminiumlegierungen und verfahren zu ihrer herstellung.
US4661172A (en) * 1984-02-29 1987-04-28 Allied Corporation Low density aluminum alloys and method
JPS6148551A (ja) * 1984-08-13 1986-03-10 Sumitomo Light Metal Ind Ltd 高温強度に優れたアルミニウム合金成形材
CH673240A5 (fr) * 1986-08-12 1990-02-28 Bbc Brown Boveri & Cie
CH673242A5 (fr) * 1986-08-12 1990-02-28 Bbc Brown Boveri & Cie

Also Published As

Publication number Publication date
US4832741A (en) 1989-05-23
EP0256450A1 (fr) 1988-02-24
US4758405A (en) 1988-07-19
DK415687A (da) 1988-02-13
DE3767807D1 (de) 1991-03-07
NO873364D0 (no) 1987-08-11
CH673240A5 (fr) 1990-02-28
DK415687D0 (da) 1987-08-10
JPS6347304A (ja) 1988-02-29
NO873364L (no) 1988-02-15

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