EP1434666A1 - Procede de production de poudres metalliques formees de particules irregulieres - Google Patents

Procede de production de poudres metalliques formees de particules irregulieres

Info

Publication number
EP1434666A1
EP1434666A1 EP02774152A EP02774152A EP1434666A1 EP 1434666 A1 EP1434666 A1 EP 1434666A1 EP 02774152 A EP02774152 A EP 02774152A EP 02774152 A EP02774152 A EP 02774152A EP 1434666 A1 EP1434666 A1 EP 1434666A1
Authority
EP
European Patent Office
Prior art keywords
stream
jet
pouring
liquid metal
metal particles
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
EP02774152A
Other languages
German (de)
English (en)
Other versions
EP1434666B1 (fr
Inventor
Claes Tornberg
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.)
TORNBERG, CLAES
Original Assignee
Individual
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
Priority claimed from AT15942001A external-priority patent/AT411230B/de
Priority claimed from AT5152002A external-priority patent/AT412328B/de
Application filed by Individual filed Critical Individual
Publication of EP1434666A1 publication Critical patent/EP1434666A1/fr
Application granted granted Critical
Publication of EP1434666B1 publication Critical patent/EP1434666B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • B22F2009/088—Fluid nozzles, e.g. angle, distance

Definitions

  • the invention relates to a method for producing a metal powder consisting of surface-fissured, so-called squishy particles by applying a liquid medium to a pouring stream of a molten metal.
  • Metal powders are predominantly produced by breaking a liquid melt into particles and then solidifying it.
  • essentially gas or liquid jets are known as means for disintegrating the liquid metal into small droplets, which jets are allowed to act on a melt stream with high kinetic energy.
  • gas-atomized metal powder with largely round, superficially essentially smooth particles is ideally suited for the production of dense bodies or materials, for example by hot isostatic pressing.
  • a surface-fissured, so-called spattery powder grain is created by dividing the melt stream with liquids, especially with water.
  • the so-called water-atomized metal powder usually has a lower bulk density after drying, the pouring properties also deteriorating due to the surface formation.
  • a so-called green compact can be created, which is continuously porous due to the jagged surface structure of the grains.
  • the green compact or pressing prior to sintering often has the desired stability, which promotes non-destructive manipulation.
  • the spattery powder grain shape is advantageously suitable for producing objects from such water-atomized powders by sintering which have a high, but possibly inhomogeneous have distributed and coherent internal porosity.
  • a particular area of application for objects or machine parts with high internal porosity are maintenance-free plain bearings in which the cavities containing the connections are filled with lubricant.
  • the powder grains should have a lively surface structure with as many irregular, possibly sharp-edged projections and essentially the same and low grain weight.
  • a molten metal is broken up with liquid or a so-called water atomization from metal to powder by applying water to an essentially vertical pouring jet directed sideways downwards (Metal Powder Production and Characterization, ASM Handbook, Volume 7, Powder Metal Technologies and Applications, pages 35 to 52).
  • the high-pressure or high-speed water jet can have an annular V-shape or cone shape, an open V-shape, a closed V-shape, a pyramid shape or a special shape.
  • the angle at which the water jet strikes the metal stream or the vertical speed component hits the metal stream is important for the formation of powder particles. As the angle of the water jet increases, the average particle size of the powder decreases.
  • the aim of the invention is to overcome the disadvantages of the prior art and to provide a method of the type mentioned at the outset with which metal powder with low grain weights or a high proportion of small powder grains and improved sharp-edged or spattered parts is available within narrow limits Surface form can be produced, which powder provides more favorable processing properties and higher quality of the parts sintered therefrom.
  • the liquid metal particles have a high kinetic energy when they come into contact with the high-speed current, which is at least partially formed with liquid medium, and are shot into it, so to speak, which also suppresses the "welled up water” phenomenon.
  • the following step can a large angle of application of the liquid high-speed stream can be applied without the so-called "welled up-water” phenomenon occurring.
  • these conditions bring about an effective disintegration of the liquid metal particles into small, largely equilibrium particles, and on the other hand an advantageous surface shape of the powder grains solidified from the particles.
  • the method can be carried out particularly effectively, in particular if the metal is overheated by the pouring jet, if the pouring jet is deflected and its surface area is enlarged in the first step and / or the surface-enlarged pouring jet is deflected and comminuted and the liquid metal particles formed are accelerated in the second step with (a) streams (stream) formed at least partially with liquid medium.
  • a deflection from the flow direction and an increase in the surface area of the pouring jet take place in the first process step with a gas stream, a comparatively less dissipation of thermal energy from the liquid metal is achieved or a reduction in the overheating is reduced, as a result of which a breakdown into liquid metal particles with less Viscosity can be promoted.
  • the surface-enlarged pouring jet is deflected and broken up and the liquid metal particles formed thereby are accelerated in a gas flow in the second process step.
  • This measure brings about a lower lowering of the temperature in the region of the metal particles near the surface, in particular when accelerating the same, and intensifies in the third process step, when it hits and / or is immersed in the high-speed stream formed with liquid medium, that the surface of the powder grains becomes fissured or becomes brittle. It is believed that this beneficial effect is brought about by an improved surface contact between the metal with a high degree of liquid or with increased overheating and the liquid medium.
  • liquid metal particle stream is acted upon and divided into at least partially liquid medium by a high-speed flat stream.
  • the invention further aims at an embodiment of the above Process by which the quality of the spattery powder from some metals and alloys is improved.
  • This goal is achieved in that a deflection of the pouring jet in its direction of flow and an increase in its surface area in the first process step and / or a deflection of the surface-enlarged pouring jet and its comminution, and an acceleration of the liquid metal particles formed in the second process step with (a) from heated gas ( en) formed current (currents) take place.
  • the gas stream for the first and / or for the second process step is heated to a temperature of above room temperature, preferably of above 200 ° C., in particular of above 400 ° C., optionally by means of a heat exchanger.
  • a precise setting of the elevated temperature of the gas flow can be done, for example, with a heating coil in a flow channel. In this way, the surface of small metal particles in particular Heat dissipation and a thickening of the near-surface zone are reduced or delayed.
  • a gas or gas mixture with a low cooling effect on the surface of the pouring jet or the liquid metal particles is used for the first and / or for the second method step.
  • the advantages achieved here are essentially due to the fact that the gas stream (s) for pretreatment or preparation of the pouring stream for fine division thereof are created in a particularly simple and inexpensive manner by means of the high-speed stream.
  • heating of the treatment gas stream can be achieved on the one hand and, on the other hand, a resulting increase in volume can result in a favorable increase in the flow intensity.
  • the combustion can also reduce the oxygen content in the treatment stream.
  • the gas stream is heated and shaped in a means containing a burner, in particular high-speed burner.
  • a burner in particular high-speed burner.
  • the pouring jet emerging from the distributor and / or the surface-enlarged pouring jet can be acted upon with hot gas in the second process step and processed in such a way that the prerequisites for dividing it into desired high-quality metal powder can be achieved in the third process step.
  • a device 3 which is advantageously designed as a flat jet nozzle device, acts in a first method step on the vertical pouring jet 2 at an acute angle ⁇ with a deflection medium 31, e.g. Water, water-gas mixture or gas, the pouring stream 2 flowing in the area 32 such that it is spread to enlarge the surface.
  • a deflection medium 31 e.g. Water, water-gas mixture or gas
  • a medium jet 41 advantageously formed with a wide shape and having an acute angle? incident flow.
  • the widened pouring jet 21 is deflected again and divided into liquid metal particles 22.
  • the liquid metal particles 22 become, as shown by the symbol V, by means of the medium jet 41 , accelerated.
  • the accelerated liquid metal particles 22 are subsequently introduced or enclosed in the region 52 in a flat high-speed stream 51, which is directed at an angle für to the trajectory of the metal particles 22.
  • the media jets 31 and 41 of the first and second process steps can also be formed advantageously with gas, preferably nitrogen, with an application of gas in the preparation of the metal stream for powder particle size, a lower superficial dissipation of overheating heat from the metal particles and an increased Can produce crispness of the grain surface of the powder with increased economy.
  • gas preferably nitrogen
  • FIG. 1a The embodiment of the invention is explained on the basis of a schematic illustration in FIG. 1a.
  • a metal casting stream 2 which may be only slightly overheated, emerges from a metallurgical vessel through a nozzle block 11.
  • a gas stream 6 enclosing it can be provided, which is brought to a temperature above room temperature.
  • a means preferably designed as a flat jet device 3, for acting on and deflecting the pouring jet 2 generates a hot gas stream 31, for example at a temperature of over 600 ° C., which softens the pouring jet 2 without increasing the cooling effect.
  • Another charging system 4 can also create a warm or hot gas flow 41, which, if necessary, also divides the surface-enlarged pouring jet 21 without disadvantageous cooling and accelerates the liquid metal particles.
  • the loading systems 3 and 4 can also be at least partially designed as a burner device.

Landscapes

  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
  • Springs (AREA)

Abstract

L'invention concerne la production d'une poudre métallique formée de particules fissurées superficiellement, dites irrégulières, à savoir, d'une poudre métallique obtenue par atomisation aqueuse. L'invention a pour but d'obtenir une forme superficielle, dite irrégulière, des grains de poudre (23) dans une classe pondérale étroite et conférant, par ailleurs, aux corps frittés, une porosité élevée avec une répartition homogène. A cet effet, l'invention est caractérisée en ce que, dans une première étape, le jet de coulée (2) est dévié dans sa direction d'écoulement et grossi superficiellement et en ce que, dans une deuxième étape, on provoque une nouvelle déviation du jet grossi superficiellement (21), avec division de celui-ci et accélération des particules métalliques liquides formées (22), et en ce que, dans une troisième étape, lesdites particules métalliques (22) sont appliquées et divisées, sous un angle gamma de 10 à 90 DEG par rapport à la direction de déplacement de celles-ci, avec un courant à vitesse élevée formé au moins partiellement d'un milieu liquide (51), après quoi les particules (23) sont solidifiées. En vue de réduire la surchauffe du bain fondu métallique et/ou d'améliorer la qualité de la poudre métallique produite, une variante d'exécution de l'invention est caractérisée en ce qu'on provoque une déviation du jet de coulée (2) dans sa direction d'écoulement et un grossissement superficiel de celui-ci (21), dans une première étape du procédé, et/ou une déviation du jet de coulée grossi superficiellement (21) et sa fragmentation, ainsi qu'une accélération des particules métalliques liquides formées (22), dans une deuxième étape du procédé, avec un ou plusieurs courants (6, 31, 41) formés d'un ou de plusieurs gaz chauds ou de mélanges de gaz chauds.
EP02774152A 2001-10-10 2002-09-30 Procede de production de poudres metalliques formees de particules irregulieres Expired - Lifetime EP1434666B1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
AT15942001A AT411230B (de) 2001-10-10 2001-10-10 Verfahren zur herstellung von metallpulver aus spratzigen teilchen
AT15942001 2001-10-10
AT5152002 2002-04-03
AT5152002A AT412328B (de) 2002-04-03 2002-04-03 Verfahren zur herstellung von metallpulver
PCT/AT2002/000284 WO2003031103A1 (fr) 2001-10-10 2002-09-30 Procede de production de poudres metalliques formees de particules irregulieres

Publications (2)

Publication Number Publication Date
EP1434666A1 true EP1434666A1 (fr) 2004-07-07
EP1434666B1 EP1434666B1 (fr) 2005-01-05

Family

ID=25608348

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02774152A Expired - Lifetime EP1434666B1 (fr) 2001-10-10 2002-09-30 Procede de production de poudres metalliques formees de particules irregulieres

Country Status (10)

Country Link
US (1) US7309375B2 (fr)
EP (1) EP1434666B1 (fr)
JP (1) JP4328204B2 (fr)
CN (1) CN1290654C (fr)
AT (1) ATE286446T1 (fr)
BR (1) BR0213188B1 (fr)
CA (1) CA2463125C (fr)
DE (1) DE50201970D1 (fr)
ES (1) ES2236584T3 (fr)
WO (1) WO2003031103A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102421026B1 (ko) 2016-08-24 2022-07-14 5엔 플러스 아이엔씨. 저융점 금속 또는 합금 분말 미립화 제조 공정
EP3752304B1 (fr) 2018-02-15 2023-10-18 5n Plus Inc. Procédés de fabrication par atomisation de poudres de métal ou d'alliage à point de fusion élevé

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR877043A (fr) * 1939-01-18 1942-11-25 Prazisionsguss Fabrik Nu Rnber Dispositif pour la pulvérisation de métal
US4298553A (en) * 1969-09-04 1981-11-03 Metal Innovations, Inc. Method of producing low oxide metal powders
US4604306A (en) * 1985-08-15 1986-08-05 Browning James A Abrasive blast and flame spray system with particle entry into accelerating stream at quiescent zone thereof
DE3841068C2 (de) * 1988-12-07 1997-09-04 Grillo Werke Ag Zinkpulver für alkalische Batterien und Verfahren zur Herstellung desselben
US5242110A (en) * 1991-12-02 1993-09-07 Praxair Technology, Inc. Method for changing the direction of an atomized flow
AT409235B (de) * 1999-01-19 2002-06-25 Boehler Edelstahl Verfahren und vorrichtung zur herstellung von metallpulver

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO03031103A1 *

Also Published As

Publication number Publication date
US7309375B2 (en) 2007-12-18
ES2236584T3 (es) 2005-07-16
CN1568239A (zh) 2005-01-19
ATE286446T1 (de) 2005-01-15
BR0213188B1 (pt) 2011-09-06
JP4328204B2 (ja) 2009-09-09
CN1290654C (zh) 2006-12-20
CA2463125C (fr) 2010-11-16
DE50201970D1 (de) 2005-02-10
CA2463125A1 (fr) 2003-04-17
BR0213188A (pt) 2004-08-31
EP1434666B1 (fr) 2005-01-05
US20040245318A1 (en) 2004-12-09
WO2003031103A1 (fr) 2003-04-17
JP2005504887A (ja) 2005-02-17

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