EP1031393B1 - Préparation de mousses métalliques - Google Patents

Préparation de mousses métalliques Download PDF

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Publication number
EP1031393B1
EP1031393B1 EP00102816A EP00102816A EP1031393B1 EP 1031393 B1 EP1031393 B1 EP 1031393B1 EP 00102816 A EP00102816 A EP 00102816A EP 00102816 A EP00102816 A EP 00102816A EP 1031393 B1 EP1031393 B1 EP 1031393B1
Authority
EP
European Patent Office
Prior art keywords
metal
blowing agent
temperature
melting
mixture
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
EP00102816A
Other languages
German (de)
English (en)
Other versions
EP1031393A1 (fr
Inventor
Wilfried Dr. Knott
Andreas Dr. Weier
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.)
Evonik Operations GmbH
Original Assignee
TH Goldschmidt AG
Goldschmidt GmbH
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 TH Goldschmidt AG, Goldschmidt GmbH filed Critical TH Goldschmidt AG
Publication of EP1031393A1 publication Critical patent/EP1031393A1/fr
Application granted granted Critical
Publication of EP1031393B1 publication Critical patent/EP1031393B1/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
    • B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
    • B22F3/10—Sintering only
    • B22F3/11—Making porous workpieces or articles
    • B22F3/1121—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers
    • B22F3/1125—Making porous workpieces or articles by using decomposable, meltable or sublimatable fillers involving a foaming process
    • 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 invention relates to a method for producing Metal foams.
  • DE 197 44 300 A deals with the manufacture and use of porous light metal parts or light metal alloy parts, being made from a powder mixture (Light metal or Al alloy and blowing agent) pressed Body in a heated closed vessel with inlet and Outlet opening at temperatures above the decomposition temperature of the blowing agent and / or melting temperature of the metal or the alloy are heated.
  • JP 03017236 A describes a method for production metallic article with cavities by placing gases in a Metal melt dissolves and then the foaming process by sudden Reduces pressure. Cooling of the melt stabilized the foam thus obtained.
  • WO 92/21457 teaches the production of Al foam or Al alloy foam by blowing gas under the surface of a molten metal, whereby abrasives, such as. B. SiC, ZrO 2 , etc., serve as stabilizers.
  • Foam aluminum becomes molten aluminum after infiltration into a porous filler by removing it obtained from the solidified metal (Zhuzao Bianjibu (1997) (2) 1-4; ZHUZET, ISSN: 1001-4977).
  • the processes involving precompacting propellants Provide green bodies that are complex and costly not suitable for the production of bulk goods. Besides, is common to these processes is that the desired temperature difference between the melting point of the metal to be foamed and the decomposition temperature of the blowing agent used if possible should be low, otherwise it is already during compacting or later disruptive blowing agent decomposition in the melting phase takes place.
  • the infiltration technology should also be assessed from this perspective, in which one painstakingly removes the porous filler from the foam matrix must remove.
  • the dissolving or blowing in of propellant gases in molten metal is not suitable for the production of near-net shape workpieces, because a System consisting of the melt with occluded gas bubbles, is not sufficiently stable in time to be used in shaping tools to be processed.
  • the above object is thus achieved in a first embodiment by a method for producing metal foams, wherein one or more metal powders, optionally applied with more or less lumpy metallic or non-metallic, e.g. B. mineral aggregates, mixed with a gas-releasing blowing agent, the mixture in an open or closed form, if necessary preheated to a temperature below the decomposition temperature of the blowing agent, the mixture is then heated to a temperature above the melting temperature of the low-melting metal, that the temperature difference between the equilibrium decomposition temperature of the blowing agent and the melting temperature of the metal or the melting temperature of the lowest-melting metal in a metal mixture is bridged in a period of time that is shorter than the time required to reach the equilibrium state in the blowing agent / propellant system at this temperature is required and cools the metal foam obtained to a temperature below the melting point of the lowest-melting metal.
  • one or more metal powders optionally applied with more or less lumpy metallic or non-metallic, e.g. B. mineral aggregates, mixed
  • the method according to the invention dispenses with methods which are described in the metal matrix to be foamed for the construction of a Propellant pressure counteracting mechanical resistance are responsible.
  • Essential to the present invention is, however, that the temperature difference between the equilibrium decomposition temperature of the blowing agent and the melting temperature of the metal or the melting temperature of the lowest melting point Metal in a metal mixture in one Time span that is shorter than the time that is to achieve equilibrium in the propellant // propellant system at this temperature is required.
  • the rapid reaching of the melting temperature of the lowest melting Metal in a metal mixture to be foamed advantageously allows the use of end matrix compatible Components (unmelted metal particles) than that Nucleation promoting the uniformity of the metal foam.
  • reaction mass is heated quickly induction heating or bombardment with laser radiation.
  • reaction heat of a fast, strongly exothermic Process e.g. aluminothermic reduction
  • Magnesium hydride used as a gas-releasing blowing agent the is commercially available.
  • metal hydrides for example titanium hydride
  • carbonates for example calcium carbonate, potassium carbonate, Sodium carbonate, sodium bicarbonate, hydrates, for example Aluminum sulfate hydrate, alum, aluminum hydroxide or easily evaporating substances, for example mercury compounds or powdered organic substances used become.
  • the gas-releasing Blowing agent contains the same metal ions as for the melting metal are provided.
  • Blowing agent is usually very low. So that's enough Blowing agent proportions in the order of several tenths Weight percent usually from. As particularly cheap in For the purposes of the present invention, amounts of blowing agent have increased from 0.1 to 10% by weight, in particular 0.2 to 5% by weight on metal powder.
  • steel with a melting point of 1500 ° C. to 1600 ° C. can be foamed using magnesium hydride ( decomposition ⁇ 280 ° C.) as a blowing agent if a small amount of MgH 2 is added to a powdered THERMIT® mixture and then the ignition of the reaction mixture initiates the aluminothermic reduction of iron oxide to iron.
  • magnesium hydride decomposition ⁇ 280 ° C.
  • the one obtained after cooling and sawed in the longitudinal direction Regulus according to FIG. 1 contains hydride decomposition Gas pores in metallic iron.
  • this embodiment of the invention opens that wide field of "reactive foaming" of metals, with a exothermic process (e.g. a reduction) temporally and spatially to the foaming process (blowing agent decomposition and formation of the molten metal) is coupled.
  • a exothermic process e.g. a reduction
  • the mechanical dispensable according to the inventive method Pretreatment of the foam-forming mixture leaves almost Any shape for the foamed semi-finished products and prepares the way to mass production.
  • Another embodiment of the present invention relates hence a foam-shaped semi-finished metal product that is used of the method according to the invention is available.
  • the quality of the metal foam obtained using the new process depends, for example on the cooling rate of the metal mass.
  • Fig. 1 shows the longitudinal profile of the porous steel body.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Claims (4)

  1. Procédé pour la préparation de mousses métalliques consistant à
    mélanger une ou plusieurs poudre(s) métallique(s), le cas échéant additionnée(s) de plus ou moins de matières additives métalliques ou non métalliques, par exemple minérales en morceaux, avec un agent porogène libérant un gaz,
    préchauffer le mélange dans un moule ouvert ou fermé, le cas échéant à une température inférieure à la température de décomposition de l'agent porogène,
    chauffer ensuite le mélange à une température supérieure à la température de fusion du métal fondant à la température la plus basse, de telle sorte que le différence de température entre la température de décomposition à l'équilibre de l'agent porogène et la température de fusion du métal ou la température de fusion du métal fondant à la température la plus basse dans un mélange de métaux, soit « couverte » dans un laps de temps qui est inférieur au temps nécessaire pour atteindre l'état d'équilibre dans le système agent porogène//gaz porogène à cette température, et
    refroidir la mousse métallique obtenue à une température inférieure au point de fusion du métal fondant à la température la plus basse.
  2. Procédé selon la revendication 1, caractérisé en ce que l'on effectue l'apport d'énergie pour la fusion du métal par chauffage par induction, rayonnement laser et/ou chaleur d'une réaction chimique.
  3. Procédé selon la revendication 1, caractérisé en ce que l'on utilise, comme agent porogène libérant un gaz, des hydrures métalliques, en particulier des hydrures de magnésium, des carbonates, des hydrates et/ou des substances qui s'évaporent à la température de réaction.
  4. Procédé selon une ou plusieurs des revendications 1 à 3, caractérisé en ce que l'on utilise l'agent porogène libérant un gaz en une quantité de 0,1 à 10% en poids, en particulier 0,2 à 5% en poids, rapporté à la poudre métallique.
EP00102816A 1999-02-24 2000-02-11 Préparation de mousses métalliques Expired - Lifetime EP1031393B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19907855 1999-02-24
DE19907855A DE19907855C1 (de) 1999-02-24 1999-02-24 Herstellung von Metallschäumen

Publications (2)

Publication Number Publication Date
EP1031393A1 EP1031393A1 (fr) 2000-08-30
EP1031393B1 true EP1031393B1 (fr) 2004-01-28

Family

ID=7898625

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00102816A Expired - Lifetime EP1031393B1 (fr) 1999-02-24 2000-02-11 Préparation de mousses métalliques

Country Status (6)

Country Link
US (1) US6444007B1 (fr)
EP (1) EP1031393B1 (fr)
AT (1) ATE258477T1 (fr)
CA (1) CA2298348C (fr)
DE (2) DE19907855C1 (fr)
NO (1) NO20000848L (fr)

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6852272B2 (en) * 2001-03-07 2005-02-08 Advanced Ceramics Research, Inc. Method for preparation of metallic and ceramic foam products and products made
JP4344141B2 (ja) * 2001-05-19 2009-10-14 エボニック ゴルトシュミット ゲゼルシャフト ミット ベシュレンクテル ハフツング 金属発泡体の製造
DE10161348A1 (de) * 2001-12-13 2003-06-26 Trw Automotive Safety Sys Gmbh Fahrzeuglenkrad
WO2005113179A2 (fr) * 2004-05-14 2005-12-01 Jeanette Garr Procede et systeme de fabrication d'un produit de mousse de metal et utilisations correspondantes
US7582361B2 (en) * 2004-06-21 2009-09-01 Purgert Robert M Lightweight structural members
TW201003024A (en) * 2008-04-28 2010-01-16 Basf Se Open-cell porous shaped bodies for heat exchangers
US20110111251A1 (en) * 2009-11-10 2011-05-12 Ken Evans Process for producing a foamed metal article and process for producing a foamable metal precursor
US20150321289A1 (en) * 2014-05-12 2015-11-12 Siemens Energy, Inc. Laser deposition of metal foam
DE102014209408A1 (de) 2014-05-19 2015-11-19 Evonik Degussa Gmbh Ethoxylatherstellung unter Verwendung hoch aktiver Doppelmetallcyanid-Katalysatoren
PL3168273T3 (pl) 2015-11-11 2018-10-31 Evonik Degussa Gmbh Polimery utwardzalne
PL3321304T3 (pl) 2016-11-15 2019-11-29 Evonik Degussa Gmbh Mieszaniny cyklicznych, rozgałęzionych siloksanów typu D/T i ich dalszych produktów
EP3415547B1 (fr) 2017-06-13 2020-03-25 Evonik Operations GmbH Procédé de fabrication de polyéthersiloxanes liés par sic
EP3415548B1 (fr) 2017-06-13 2020-03-25 Evonik Operations GmbH Procédé de fabrication de polyéthersiloxanes liés par sic
EP3438158B1 (fr) 2017-08-01 2020-11-25 Evonik Operations GmbH Production de polyéthersiloxanes par une liaison sioc
EP3467006B1 (fr) 2017-10-09 2022-11-30 Evonik Operations GmbH Mélanges de siloxanes ramifiés-cycliques de type d/t et leurs produits secondaires
EP3611215A1 (fr) 2018-08-15 2020-02-19 Evonik Operations GmbH Procédé de production de siloxanes portant des groupes acétoxy
EP3611214A1 (fr) 2018-08-15 2020-02-19 Evonik Operations GmbH Copolymères bloc polydiméthylsiloxane-polyoxyalkylène linéaires à liaisons sioc
CN111250707B (zh) * 2020-03-14 2022-04-01 中北大学 基于选择性激光熔化成形技术的复合金属发泡粉体材料及其制备方法
CN112662908B (zh) * 2021-01-04 2023-09-12 云南迈特力医疗技术有限公司 一种多孔低熔点金属外骨骼的制备装置及方法
CN114871433A (zh) * 2022-04-21 2022-08-09 湖北黄石科创模具技术研究院有限公司 一种基于碳酸氢钠颗粒多孔透气钢的制备方法
CN115074569B (zh) * 2022-07-21 2023-03-31 内蒙古环投环保技术有限公司 一种多孔铜合金的制备方法

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US3087807A (en) * 1959-12-04 1963-04-30 United Aircraft Corp Method of making foamed metal
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WO1989009796A1 (fr) * 1988-04-05 1989-10-19 Kanegafuchi Kagaku Kogyo Kabushiki Kaisha Composition expansible, procede pour sa production, mousse rigide, et procede pour sa production
JPH0317236A (ja) * 1989-06-14 1991-01-25 Nkk Corp 発泡金属の製造方法
US4973358A (en) * 1989-09-06 1990-11-27 Alcan International Limited Method of producing lightweight foamed metal
DE4101630A1 (de) * 1990-06-08 1991-12-12 Fraunhofer Ges Forschung Verfahren zur herstellung aufschaeumbarer metallkoerper und verwendung derselben
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Also Published As

Publication number Publication date
US6444007B1 (en) 2002-09-03
NO20000848D0 (no) 2000-02-21
EP1031393A1 (fr) 2000-08-30
CA2298348C (fr) 2008-06-17
CA2298348A1 (fr) 2000-08-24
ATE258477T1 (de) 2004-02-15
DE19907855C1 (de) 2000-09-21
NO20000848L (no) 2000-08-25
DE50005107D1 (de) 2004-03-04

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