EP0884123B1 - Corps métallique moussable - Google Patents

Corps métallique moussable Download PDF

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Publication number
EP0884123B1
EP0884123B1 EP98109728A EP98109728A EP0884123B1 EP 0884123 B1 EP0884123 B1 EP 0884123B1 EP 98109728 A EP98109728 A EP 98109728A EP 98109728 A EP98109728 A EP 98109728A EP 0884123 B1 EP0884123 B1 EP 0884123B1
Authority
EP
European Patent Office
Prior art keywords
metal
gas
blowing agent
metal powder
compacted
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
EP98109728A
Other languages
German (de)
English (en)
Other versions
EP0884123A3 (fr
EP0884123A2 (fr
Inventor
Wilfried Dr. Knott
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
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Application filed by TH Goldschmidt AG, Goldschmidt GmbH filed Critical TH Goldschmidt AG
Publication of EP0884123A2 publication Critical patent/EP0884123A2/fr
Publication of EP0884123A3 publication Critical patent/EP0884123A3/fr
Application granted granted Critical
Publication of EP0884123B1 publication Critical patent/EP0884123B1/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

Definitions

  • the invention relates to a method for manufacturing foamable metal body, the compact semi-finished product available in this way, the use of the semi-finished product for foaming a closed cell Metal body and the closed-cell cells thus obtained foam-shaped metal body.
  • EP-B-0 460 392 describes a process for the production foamable metal body with mostly closed porosity, the resulting pores evenly throughout the metal body distributed and should have a uniform size, in which a mixture of at least one metal powder and at least one gas-releasing blowing agent powder and compacted into a semi-finished product.
  • the one described here The method is characterized in that the hot compaction at a temperature above the decomposition temperature of the blowing agent takes place, the connection of the Metal powder particles are predominantly made by diffusion and at a pressure high enough to disintegrate the Prevent blowing agent so that the metal particles themselves in a fixed connection with each other and one represent gas-tight seal for the gas particles of the blowing agent.
  • DE-C-41 24 591 describes a process for the production foamable metal body by rolling a powder mixture, at which contains the powder mixture of at least one blowing agent Powder and a metal powder, in which the powder mixture is filled into a metal hollow profile and rolled.
  • the Cold pressing bodies obtainable according to this publication cannot only be heated before the rolling process, but also after individual roll passes are reheated. Here too the Cold pressed body to a temperature above the decomposition temperature of the blowing agent heated.
  • DE-A-44 26 627 relates to a metallic composite material and a process for its manufacture.
  • the metallic Composite material with a core of one or more porous Metal materials and at least one top layer made of solid Material points between the core and the top layer / top layers metallic bonds.
  • the object of the present invention is on the one hand improved process for the production of foamable metal bodies and secondly in an improvement in technical Properties of the semi-finished products as well as the closed-cell ones foam-shaped metal body compared to the prior art.
  • the first-mentioned object of the present invention is achieved by a process for producing foamable metal bodies, in which a mixture of at least one metal powder and one gas-releasing blowing agent produced and a semi-finished product is compacted.
  • the method is characterized in that a gas-releasing blowing agent containing magnesium hydride starts.
  • the chemical compound "magnesium hydride” has long been State of the art. It was used as a foaming agent for rubber materials in the US-A-3 114 724. However, in the area of manufacturing foamable metal body previously other gas-releasing blowing agents, for example titanium hydride, carbonates, hydrates or easily evaporating substances used. Meanwhile, however Magnesium hydride is no longer just a laboratory product, but also commercially available on a larger scale. A core of the present The invention thus consists of magnesium hydride to supply new use for the production of foamable metal bodies. For example, metal powder is applied thorough mixing with a small amount of magnesium hydride containing blowing agent and compacted the thus obtained Mixture, so it is possible to manufacture compacts to obtain foam-shaped metal bodies. The so available Foam-shaped metal bodies have a very homogeneous pore density distribution down to the surface areas of the molded body on which is a significant advance over foam-like Represents metal bodies with known gas-releasing Blowing agents of the prior art can be obtained
  • magnesium hydride especially autocatalytic Magnesium hydride produced, containing blowing agent metallic foam bodies have a different type Morphology as foams, for example with titanium hydride be obtained as a gas-releasing blowing agent.
  • the aluminum foam piece is in use of magnesium hydride according to the present invention in the Fig. 1 foamed significantly more uniformly.
  • the compression of the Bottom is only about 3 mm thick, while the aluminum foam according to the state of the art up to 1 cm non-foamed Material can be found at the bottom.
  • Metal foam is also the number of cells per unit volume significantly larger, preferably with regard to for the presence of small cells. Also in this foam to detect a certain irregularity in the cells, which, however, is significantly less pronounced than with the foam according to the state of the art.
  • the surface of the foam according to The present invention has more openings than that of the Foam according to the prior art. But the openings are much finer and more even.
  • one Plastic foam can be used for the purposes of the present invention speak of small, uniform blow-offs.
  • all fusible metals or metal alloys foamable in the sense of the present invention are as metal powder Aluminum and its alloys used. Accordingly it is particularly preferred that the metal powder is substantially made of aluminum, optionally with conventional alloy components, such as magnesium, copper and / or silicon.
  • Metal powder is available to the person skilled in the art in a wide variety of processes to disposal.
  • Particularly preferred in the sense of the present Invention is cold pressing, the cold isostatic Pressing, rolling, extrusion and extrusion.
  • this is preferred Compacting below the decomposition temperature of the magnesium hydride containing gas-releasing blowing agent, preferably performed at room temperature. While in the prior art usually compacting at high temperature, especially above the decomposition temperature of the gas-releasing Blowing agent was carried out in the invention Use of gas-releasing blowing agents containing magnesium hydride found that compacting even at low Temperatures is possible.
  • the mixture of metal powder and Magnesium hydride containing gas-releasing blowing agent When compacting, the mixture of metal powder and Magnesium hydride containing gas-releasing blowing agent the highest possible density can be compressed. Particularly preferred within the meaning of the present invention is the compacting in such a way that the density at least 90%, in particular at least 95% of the theoretical density of the Metal of the metal powder. This can be caused by high pressing forces can be achieved. So by applying 0.5% magnesium hydride as a blowing agent from spray-atomized spherical Aluminum (AlMgSi 6061) by cold isostatic pressing a cylinder with a pre-pressure of 450 bar accordingly a pressing force of about 10 t with a density of more than 90% of the theoretical density of aluminum can be produced.
  • AlMgSi 6061 spray-atomized spherical Aluminum
  • the amount of magnesium hydride to be used according to the invention containing gas-releasing blowing agent is usually very low.
  • the proportions of blowing agent are of the order of magnitude usually from a few tenths of a percent by weight because that compacted semi-finished product is fully compressed and propellant cannot escape.
  • Amounts of blowing agents have proven to be particularly favorable from 0.1 to 2% by weight, in particular 0.2 to 1 wt .-%, based on the metal powder, proven.
  • magnesium hydride used itself, the commercially available is.
  • known ones can also be used 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 are used.
  • Another embodiment of the present invention comprises the semi-finished products obtainable by compacting, in which the metal particles in a relatively firm connection with each other are and an essentially gastight seal form for the gas particles of the blowing agent.
  • These semi-finished products can optionally by known methods to be formed in order to achieve the appropriate pressure and temperature conditions according to known methods to a closed cell Foam metal body. So can the foaming of the semi-finished product, if no final shape is specified is. Alternatively, the foaming can also be carried out in one partially or completely closed form, where the finished porous metal body the specified shape of the tool accepts.
  • the conditions for foaming the semi-finished products are the expert from the state of the aforementioned in the introduction Technology known.
  • Another embodiment of the present invention above also relates to those obtainable using the above method closed-cell foam-shaped metal body.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Powder Metallurgy (AREA)
  • Laminated Bodies (AREA)

Claims (11)

  1. Procédé pour la préparation de corps métalliques expansibles, dans lequel des mélanges constitués d'au moins une poudre de métal et un agent moussant séparant un gaz sont préparés et compactés en un demi-produit, caractérisé en ce qu'on utilise un agent moussant séparant un gaz contenant de l'hydrure de magnésium.
  2. Procédé selon la revendication 1, caractérisé en ce que la poudre de métal est essentiellement constituée d'aluminium, le cas échéant avec des constituants d'alliage usuels.
  3. Procédé selon la revendication 1, caractérisé en ce que le compactage comprend la compression à froid, la compression isostatique à froid, le laminage, le filage et/ou l'extrusion.
  4. Procédé selon l'une ou plusieurs des revendications 1 à 3, caractérisé en ce qu'on réalise le compactage au-dessous de 1a température de décomposition de l'agent moussant séparant un gaz, en particulier à température ambiante.
  5. Procédé selon la revendication 1, caractérisé en ce qu'on compacte la poudre de métal et l'agent moussant séparant un gaz à une densité d'au moins 90%, en particulier de 95% de la densité théorique du métal de la poudre de métal.
  6. Procédé selon la revendication 1, caractérisé en ce qu'on utilise l'agent moussant séparant un gaz en une quantité de 0,1 à 2% en poids, en particulier de 0,2 à 1% en poids, par rapport à la poudre de métal.
  7. Procédé selon l'une ou plusieurs des revendications 1 à 6, caractérisé en ce qu'on utilise le cas échéant l'hydrure de magnésium en plus d'autres hydrures de métal, en particulier l'hydrure de titane, de carbonates, d'hydrates et/ou de substances qui s'évaporent facilement comme agent moussant séparant un gaz.
  8. Demi-produit compacté pouvant être obtenu selon un procédé selon l'une ou plusieurs des revendications 1 à 7.
  9. Utilisation du demi-produit selon la revendication 8 pour le moussage d'un corps métallique à cellules fermées sous l'effet d'une pression plus élevée ou réduite et/ou d'une température plus élevée.
  10. Utilisation selon la revendication 9 pour le remplissage par moussage d'espaces creux dans des outils de moulage.
  11. Corps métalliques en forme de mousse à cellules fermées, pouvant être obtenus selon les revendications 9 ou 10.
EP98109728A 1997-06-10 1998-05-28 Corps métallique moussable Expired - Lifetime EP0884123B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19724326 1997-06-10
DE19724326 1997-06-10

Publications (3)

Publication Number Publication Date
EP0884123A2 EP0884123A2 (fr) 1998-12-16
EP0884123A3 EP0884123A3 (fr) 2001-04-04
EP0884123B1 true EP0884123B1 (fr) 2003-03-26

Family

ID=7831969

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98109728A Expired - Lifetime EP0884123B1 (fr) 1997-06-10 1998-05-28 Corps métallique moussable

Country Status (6)

Country Link
US (1) US5972285A (fr)
EP (1) EP0884123B1 (fr)
JP (1) JPH1112605A (fr)
AT (1) ATE235336T1 (fr)
DE (1) DE59807606D1 (fr)
ES (1) ES2193439T3 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
CN109550963A (zh) * 2018-12-13 2019-04-02 华南理工大学 一种用于3d打印的亚微米氢化物颗粒增强铝基粉体的制备方法

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EP3321304B1 (fr) 2016-11-15 2019-06-19 Evonik Degussa GmbH Mélanges de siloxanes ramifiés-cycliques de type d/t et leurs produits secondaires
EP3415548B1 (fr) 2017-06-13 2020-03-25 Evonik Operations GmbH Procédé de fabrication de polyéthersiloxanes liés par sic
EP3415547B1 (fr) 2017-06-13 2020-03-25 Evonik Operations GmbH Procédé de fabrication de polyéthersiloxanes liés par sic
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EP3467006B1 (fr) 2017-10-09 2022-11-30 Evonik Operations GmbH Mélanges de siloxanes ramifiés-cycliques de type d/t et leurs produits secondaires
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CN110142402B (zh) * 2019-06-03 2022-01-25 东睦新材料集团股份有限公司 一种粉末冶金铝基材料及其制备方法
CN110216275B (zh) * 2019-06-03 2022-01-25 东睦新材料集团股份有限公司 一种粉末冶金铝基材料及其制备方法
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CN109550963A (zh) * 2018-12-13 2019-04-02 华南理工大学 一种用于3d打印的亚微米氢化物颗粒增强铝基粉体的制备方法

Also Published As

Publication number Publication date
ATE235336T1 (de) 2003-04-15
JPH1112605A (ja) 1999-01-19
US5972285A (en) 1999-10-26
EP0884123A3 (fr) 2001-04-04
EP0884123A2 (fr) 1998-12-16
DE59807606D1 (de) 2003-04-30
ES2193439T3 (es) 2003-11-01

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