EP0334065A1 - Process for preparing porous elements - Google Patents
Process for preparing porous elements Download PDFInfo
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- EP0334065A1 EP0334065A1 EP89103620A EP89103620A EP0334065A1 EP 0334065 A1 EP0334065 A1 EP 0334065A1 EP 89103620 A EP89103620 A EP 89103620A EP 89103620 A EP89103620 A EP 89103620A EP 0334065 A1 EP0334065 A1 EP 0334065A1
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- Prior art keywords
- aluminum
- sintering
- powder
- mixed
- additive
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Classifications
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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
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
- B22F7/004—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature comprising at least one non-porous part
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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
- 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
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- 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
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- 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
- C22C1/10—Alloys containing non-metals
- C22C1/1084—Alloys containing non-metals by mechanical alloying (blending, milling)
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/003—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by using permeable mass, perforated or porous materials
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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
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
Definitions
- the invention relates to a method for producing porous components from aluminum powder or grit according to the preamble of the first claim.
- Porous components made of metal powder are widely used in the fields of filtering, heat transfer, sound insulation and as maintenance-free plain bearings. Such components are usually made of bronze or stainless steel powder. Disadvantages here are the high densities of the materials used, which lead to the high weight of such components, and the resulting high price per unit volume.
- each aluminum powder contacted with a normal atmosphere has an oxide layer on the aluminum particles, the melting or flow temperature of which is substantially above the corresponding temperature of the aluminum or an aluminum alloy.
- two-component systems ie to add additives to the aluminum powder compacted and evaporated during or after sintering or eliminated by chemical means.
- the resulting voids form the porous volume fraction.
- components sintered in this way have the disadvantage that neither channels and thus the desired flowability, nor a uniform pore diameter of a certain bandwidth are obtained. Therefore these components are not suitable for use in filter technology.
- the object of the present invention is to provide a sintering process for components made from aluminum powder which is simple and inexpensive to carry out.
- this object is achieved by the characterizing features of the first claim.
- the invention is based on the knowledge that only one additive is necessary if care is taken to ensure that the additive and the aluminum powder can form a eutectic below the melting temperature of the aluminum.
- Aluminum powder oxidized in air can thus be used, since the aggregate can render the oxide skin ineffective, so that a firm connection of the aluminum grains can be achieved. This can remove the oxide layer on the aluminum grains.
- a metallic composite is thus obtained by forming a mixed crystal in contact with a eutectic structure. The structure of the powder layers, in particular their porosity, is retained.
- the development according to claim 2 describes a preferred material with the process parameters for the aggregate.
- the use of silicon as an additive is particularly advantageous since it can penetrate through the passivating oxide layer at sintering temperature.
- the diffusion of the silicon can be further supported by mixing the two components, e.g. B. is carried out in a ball mill in a non-oxidizing atmosphere, whereby mechanical fractures in the oxide layer are achieved and obtained (claim 3).
- the sintering temperature to be set depends on the silicon content in the aluminum and the amount of the aggregate.
- the powder's morphology and sieve line, which determines the contact area, must also be taken into account. By varying the temperature, the proportion of the liquid phase rises or falls, so that the pore diameter of the component to be produced can be influenced in this way.
- the oxide layer of the aluminum powder can essentially be broken up by the additive silicon in various ways.
- the first way lies at the temperature specified in claim 2 in the ability of the silicon to diffuse through the oxide layer and thus to come into contact with the aluminum.
- the second way consists in the direct contact of the silicon with the aluminum through fractures in the oxide layer or through mecha African pressure. This is supported in particular by mixing the two components in a ball mill, as taught in claim 3.
- the third way consists in the formation of melting processes on the surface of the aluminum caused by the first two ways and the associated detachment of the oxide layer.
- the actual sintering then takes place by melting aluminum-silicon on the surface or the area near the surface of the aluminum particles with subsequent solidification (crystallization) during cooling and a homogeneous connection of the contact surfaces.
- the connection between the aluminum particles and the solidified melts is particularly good when very pure aluminum is sintered. This is primarily due to the mixed crystal formation of the silicon with the aluminum via diffusion and crystallization processes, which lead to continuous concentration gradients.
- the non-oxidizing furnace atmosphere can be achieved by a protective gas. This increases the economics of the process, since the furnace heating times in an argon atmosphere are significantly shorter than, for example, in a vacuum furnace, since heat transfer by radiation and convection can be effective in the argon atmosphere.
- the development according to claim 5 describes a further possible application of the method according to the invention.
- This enables complete components to be made from solid metal units and porous sintered aluminum powder.
- the metallic bond is achieved through the formation of mixed crystals in the boundary layer area. This is advantageous, for example, in the manufacture of heat exchangers for the purpose of better heat dissipation. It is important to ensure that the aggregate used can form a mixed crystal or a eutectic with both the aluminum powder and the component material.
- a suitable material for this is described in claim 6.
- the limit values already described for the aluminum powder with regard to the permissible additives are then to be taken into account.
- the use of non-tempered aluminum components can prevent the embrittlement that otherwise occurs with commercially available aluminum due to the sintering temperatures. The remuneration takes place during the sintering process, so that the components coming out of the furnace system correspond to commercially available goods and thus, in addition to the property of having a metallic bond with the porous component, otherwise have normal material properties.
- the sintering temperature must increase with a higher silicon content in the aluminum alloy, since diffusion processes are impeded by the already existing saturation.
- the sintering temperature can be reduced by increasing the silicon content as an additive.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Die Erfindung bezieht sich auf ein Verfahren zur Herstellung poröser Bauteile aus Aluminiumpulver oder -gries nach dem Oberbegriff des ersten Anspruchs.The invention relates to a method for producing porous components from aluminum powder or grit according to the preamble of the first claim.
Aus Metallpulver gefertigte, poröse Bauteile finden im Bereich der Filterung, der Wärmeübertragung, der Schalldämmung sowie als wartungsfreie Gleitlager vielfach Verwendung. Üblicherweise werden solche Bauteile aus Bronze- oder Edelstahlpulver hergestellt. Nachteilig sind hier die hohen Dichten der verwendeten Materialien, die zu einem hohen Gewicht solcher Bauteile führen sowie der daraus resultierende hohe Preis pro Volumeneinheit.Porous components made of metal powder are widely used in the fields of filtering, heat transfer, sound insulation and as maintenance-free plain bearings. Such components are usually made of bronze or stainless steel powder. Disadvantages here are the high densities of the materials used, which lead to the high weight of such components, and the resulting high price per unit volume.
Man ist deshalb schon dazu übergegangen, Aluminiumpulver einzusetzen, das neben ansonsten vergleichbaren Stoffdaten eine wesentlich bessere Wärmeleitfähigkeit aufweist.It has therefore already started to use aluminum powder, which, in addition to comparable material data, has a much better thermal conductivity.
Hier besteht jedoch das Problem, daß jedes mit Normalatmosphäre kontaktierte Aluminiumpulver eine Oxidschicht auf den Alumiumpartikeln aufweist, deren Schmelz- oder Fließtemperatur wesentlich oberhalb der entsprechenden Temperatur des Aluminiums oder einer Aluminiumlegierung liegt. Um hier Abhilfe zu schaffen, ist schon vorgeschlagen worden, Zweikomponentensysteme anzuwenden, also dem Aluminiumpulver Zuschlagstoffe beizumischen, die verdichtet und während oder nach der Sinterung ausgedampft oder auf chemischem Wege eliminiert werden. Die hierbei entstehenden Hohlräume bilden den porösen Volumenanteil. Derart gesinterte Bauteile haben jedoch den Nachteil, daß man weder durchgängig Kanäle und somit die gewünschte Durchströmbarkeit, noch einen einheitlichen Porendurchmesser bestimmter Bandbreite erhält. Deshalb eignen sich diese Bauteile nicht zum Einsatz in der Filtertechnik.Here, however, there is the problem that each aluminum powder contacted with a normal atmosphere has an oxide layer on the aluminum particles, the melting or flow temperature of which is substantially above the corresponding temperature of the aluminum or an aluminum alloy. In order to remedy this, it has already been proposed to use two-component systems, ie to add additives to the aluminum powder compacted and evaporated during or after sintering or eliminated by chemical means. The resulting voids form the porous volume fraction. However, components sintered in this way have the disadvantage that neither channels and thus the desired flowability, nor a uniform pore diameter of a certain bandwidth are obtained. Therefore these components are not suitable for use in filter technology.
Aus der JP-A 61-174353 ist es bekannt, Aluminiumpulver mit anderen Zuschlagstoffen in Pulverform vor dem Sintern zu vermischen. Hierbei werden neben Aluminiumpulver einer nicht beschriebenen Qualität. Zuschlagsstoffe wie Kupfer, Mangan, Magnesium und Silicium in ebenfalls nicht beschriebenen Mengenverhältnissen beigefügt, wobei immer vom Zusatz von mindestens zwei dieser Stoffe ausgegangen wird. Weiterhin fehlen Angaben über Sintertemperaturen und Sinterzeiten.From JP-A 61-174353 it is known to mix aluminum powder with other additives in powder form before sintering. In addition to aluminum powder, the quality is not described here. Additives such as copper, manganese, magnesium and silicon are also added in proportions not described, whereby it is always assumed that at least two of these substances are added. Furthermore, information about sintering temperatures and sintering times is missing.
Aufgabe der vorliegenden Erfindung ist es, ein Sinterverfahren für aus Aluminiumpulver hergestellte Bauteile bereitzustellen, das einfach und preiswert durchzuführen ist.The object of the present invention is to provide a sintering process for components made from aluminum powder which is simple and inexpensive to carry out.
Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des ersten Anspruchs gelöst. Die Erfindung beruht auf der Erkenntnis, daß nur in einziger Zuschlagsstoff notwendig ist, wenn darauf geachtet wird, daß der Zuschlagsstoff sowie das Aluminiumpulver ein Eutektikum unterhalb der Schmelztemperatur des Aluminiums bilden können. Damit kann an der Luft oxidiertes Aluminiumpulver Verwendung finden, da durch den Zuschlagsstoff die Oxidhaut unwirksam gemacht werden kann, so daß eine feste Verbindung der Aluminiumkörner zu erzielen ist. Damit kann die Entfernung der Oxidschicht auf den Aluminiumkörnern entfallen. Man erhält somit einen metallischen Verbund durch Bildung eines Mischkristalls in Kontakt mit einem eutektischen Gefüge. Hierbei bleibt die Struktur der Pulverschichten, insbesondere deren Porösität erhalten.According to the invention, this object is achieved by the characterizing features of the first claim. The invention is based on the knowledge that only one additive is necessary if care is taken to ensure that the additive and the aluminum powder can form a eutectic below the melting temperature of the aluminum. Aluminum powder oxidized in air can thus be used, since the aggregate can render the oxide skin ineffective, so that a firm connection of the aluminum grains can be achieved. This can remove the oxide layer on the aluminum grains. A metallic composite is thus obtained by forming a mixed crystal in contact with a eutectic structure. The structure of the powder layers, in particular their porosity, is retained.
Die Weiterbildung nach Anspruch 2 beschreibt ein bevorzugtes Material mit den Verfahrensparametern für den Zuschlagsstoff. Die Verwendung von Silicium als Zuschlagsstoff ist insbesondere vorteilhaft, da es durch die passivierende Oxidschicht bei Sintertemperatur dringen kann. Die Diffusion des Siliciums kann weiterhin dadurch unterstützt werden, daß die Vermischung der beiden Komponenten, z. B. in einer Kugelmühle in nicht oxidierender Atmosphäre durchgeführt wird, wodurch mechanische Bruchstellen in der Oxidschicht erzielt und erhalten werden (Anspruch 3).The development according to claim 2 describes a preferred material with the process parameters for the aggregate. The use of silicon as an additive is particularly advantageous since it can penetrate through the passivating oxide layer at sintering temperature. The diffusion of the silicon can be further supported by mixing the two components, e.g. B. is carried out in a ball mill in a non-oxidizing atmosphere, whereby mechanical fractures in the oxide layer are achieved and obtained (claim 3).
Die einzustellende Sintertemperatur hängt ab von dem Siliciumanteil im Aluminium sowie der Menge des Zuschlagsstoffes. Auch die Morphologie und die Sieblinie des Pulvers, durch die die Kontaktfläche bestimmt wird, ist zu berücksichtigen. Durch Variierung der Temperatur steigt oder fällt der Anteil der flüssigen Phase, so daß auf diese Weise der Porendurchmesser des herzustellenden Bauteils beeinflußt werden kann.The sintering temperature to be set depends on the silicon content in the aluminum and the amount of the aggregate. The powder's morphology and sieve line, which determines the contact area, must also be taken into account. By varying the temperature, the proportion of the liquid phase rises or falls, so that the pore diameter of the component to be produced can be influenced in this way.
Die Oxidschicht des Aluminiumpulvers kann also gemäß der Erfindung von dem Zuschlagsstoff Silicium auf verschiedene Arten im wesentlichen aufgebrochen werden. Der erste Weg liegt bei der nach Anspruch 2 angegebenen Temperatur in der Fähigkeit des Siliciums, durch die Oxidschicht zu diffundieren und damit in Kontakt zu dem Aluminium zu gelangen. Der zweite Weg besteht in dem unmittelbaren Kontakt des Siliciums mit dem Aluminium durch Bruchstellen in der Oxidschicht bzw. durch mecha nischen Druck. Dies wird insbesondere durch das Vermischen der beiden Komponenten in einer Kugelmühle unterstützt, wie Anspruch 3 lehrt. Der dritte Weg besteht in dem durch die beiden ersten Wege hervorgerufenen Entstehen von Schmelzprozessen auf der Oberfläche des Aluminiums und der damit verbundenen Ablösung der Oxidschicht. Die eigentliche Versinterung erfolgt dann durch ein Aluminium-Silicium-Schmelzen auf der Oberfläche bzw. dem oberflächennahen Bereich der Aluminiumpartikel mit anschließendem Erstarren (Kristallisation) beim Abkühlen und homogener Verbindung der Kontaktflächen. Die Verbindung zwischen den Aluminiumteilchen und den erstarrten Schmelzen ist dann besonders gut, wenn sehr reines Aluminium versintert wird. Dies beruht in erster Linie auf der Mischkristallbildung des Siliciums mit dem Aluminium über Diffusions- und Kristallisationsprozesse, die zu kontinuierlichen Konzentrationsgradienten führen.According to the invention, the oxide layer of the aluminum powder can essentially be broken up by the additive silicon in various ways. The first way lies at the temperature specified in claim 2 in the ability of the silicon to diffuse through the oxide layer and thus to come into contact with the aluminum. The second way consists in the direct contact of the silicon with the aluminum through fractures in the oxide layer or through mecha African pressure. This is supported in particular by mixing the two components in a ball mill, as taught in claim 3. The third way consists in the formation of melting processes on the surface of the aluminum caused by the first two ways and the associated detachment of the oxide layer. The actual sintering then takes place by melting aluminum-silicon on the surface or the area near the surface of the aluminum particles with subsequent solidification (crystallization) during cooling and a homogeneous connection of the contact surfaces. The connection between the aluminum particles and the solidified melts is particularly good when very pure aluminum is sintered. This is primarily due to the mixed crystal formation of the silicon with the aluminum via diffusion and crystallization processes, which lead to continuous concentration gradients.
Kontinuierliche Konzentrationsgradienten in den Kontaktbereichen sind nicht mehr zu verwirklichen, wenn der Gesamtsiliciumanteil bei Silicium als Zuschlagswerkstoff und dem Siliciumlegierungsanteil in dem Aluminiumausgangswerkstoff 12 Gewichtsprozent übersteigt.Continuous concentration gradients in the contact areas can no longer be achieved if the total silicon content in silicon as the additive material and the silicon alloy content in the aluminum starting material exceeds 12 percent by weight.
Die nicht oxidierende Ofenatmosphäre kann nach einer Weiterbildung (Anspruch 4) der Erfindung durch ein Schutzgas erreicht werden. Dadurch wird die Wirtschaftlichkeit des Verfahrens erhöht, da die Ofenaufheizzeiten in Argonatmosphäre wesentlich kürzer sind als z.B. in einem Vakuumofen, da bei der Argonatmosphäre eine Wärmeübertragung durch Strahlung und Konvektion wirksam werden kann.According to a further development (claim 4) of the invention, the non-oxidizing furnace atmosphere can be achieved by a protective gas. This increases the economics of the process, since the furnace heating times in an argon atmosphere are significantly shorter than, for example, in a vacuum furnace, since heat transfer by radiation and convection can be effective in the argon atmosphere.
Die Weiterbildung nach Anspruch 5 beschreibt eine weitere Einsatzmöglichkeit des erfindungsgemäßen Verfahrens. Dadurch können komplette Bauteile aus massiven Metalleinheiten und porös gesintertem Aluminiumpulver hergestellt werden. Hier wird der metallische Verbund durch die Bildung von Mischkristallen im Grenzschichtbereich erzielt. Dies ist beispielsweise bei der Herstellung von Wärmetauschern zwecks besserer Wärmeableitung günstig. Hierbei ist darauf zu achten, daß der verwendete Zuschlagsstoff sowohl mit dem Aluminiumpulver als auch mit dem Bauteilmaterial einen Mischkristall bzw. ein Eutektikum bilden kann.The development according to claim 5 describes a further possible application of the method according to the invention. This enables complete components to be made from solid metal units and porous sintered aluminum powder. Here, the metallic bond is achieved through the formation of mixed crystals in the boundary layer area. This is advantageous, for example, in the manufacture of heat exchangers for the purpose of better heat dissipation. It is important to ensure that the aggregate used can form a mixed crystal or a eutectic with both the aluminum powder and the component material.
Ein geeignetes Material hierfür beschreibt Anspruch 6. Hierbei sind dann die bereits für das Aluminiumpulver geschilderten Grenzwerte hinsichtlich der zulässigen Zuschlagsstoffe zu berücksichtigen. Durch die Verwendung unvergüteter Aluminiumbauteile kann die sonst bei handelsüblichen Aluminium auftretende Versprödung aufgrund der Sintertemperaturen verhindert werden. Die Vergütung findet hierbei während des Sinterprozesses statt, so daß die aus der Ofenanlage gelangenden Bauteile handelsüblicher Ware entsprechen und somit neben der Eigenschaft, einen metallischen Verbund mit dem porösen Bauteil aufzuweisen, ansonsten normale Werkstoffeigenschaften haben.A suitable material for this is described in claim 6. The limit values already described for the aluminum powder with regard to the permissible additives are then to be taken into account. The use of non-tempered aluminum components can prevent the embrittlement that otherwise occurs with commercially available aluminum due to the sintering temperatures. The remuneration takes place during the sintering process, so that the components coming out of the furnace system correspond to commercially available goods and thus, in addition to the property of having a metallic bond with the porous component, otherwise have normal material properties.
Im folgenden wird ein Beispiel des erfindungsgemäßen Verfahrens beschrieben.An example of the method according to the invention is described below.
Es wurde Aluminiumpulver mit einem Reinaluminiumanteil von 99,9 %, einer glatten Oberfläche und einer Korngröße von 200 - 500 µm mit einem Siliciumanteil von 5 Gewichtsprozenten gemischt. Dieses Gemisch wurde einer Sintertemperatur von 600°C fünf Minuten ausgesetzt. Die fünf Minuten Haltezeit beziehen sich auf einen auf 600°C vorgeheizten Ofen. Es wurden formstabile Sinterkörper erzielt.It was mixed aluminum powder with a pure aluminum content of 99.9%, a smooth surface and a grain size of 200 - 500 microns with a silicon content of 5 percent by weight. This mixture was exposed to a sintering temperature of 600 ° C for five minutes. The a five minute hold time refers to an oven preheated to 600 ° C. Dimensionally stable sintered bodies were achieved.
Allgemein kann festgehalten werden, daß mit höherem Siliciumanteil in der Aluminiumlegierung die Sintertemperatur steigen muß, da durch die bereits vorliegende Sättigung Diffusionsvorgänge behindert werden. Andererseits kann bei reinem Aluminium durch Erhöhung des Siliciumanteils als Zuschlagsstoff die Sintertemperatur erniedrigt werden.In general, it can be stated that the sintering temperature must increase with a higher silicon content in the aluminum alloy, since diffusion processes are impeded by the already existing saturation. On the other hand, in the case of pure aluminum, the sintering temperature can be reduced by increasing the silicon content as an additive.
Claims (6)
dadurch gekennzeichnet, daß dem Aluminiumpulver oder -gries ein Zuschlagstoff beigemischt wird, der in einer nicht oxidierenden Ofenatmosphäre bei Sintertemperaturen einen Mischkristall bzw. ein Eutektikum mit dem Aluminium, unterhalb der Schmelztemperatur des Aluminiums, bildet.1. A method for producing porous components from untreated, oxidized aluminum powder or grit by sintering,
characterized in that an additive is mixed with the aluminum powder or grit, which forms a mixed crystal or a eutectic with the aluminum, below the melting temperature of the aluminum, in a non-oxidizing furnace atmosphere at sintering temperatures.
dadurch gekennzeichnet, daß das Aluminiumausgangsmaterial eine Aluminiumlegierung aus Reinaluminiumanteilen größer 96 % und Siliciumanteilen kleiner 0,5 % ist, daß als Zuschlagsstoff gepulvertes Silicium von 0,5 - 5 Gewichtsprozenten als Dispersion beigemischt wird und daß abhängig von der gewählten Aluminiumpulverfraktion eine Sintertemperatur zwischen 577° und 650°C eingestellt wird.2. The method according to claim 1,
characterized in that the aluminum starting material is an aluminum alloy of pure aluminum portions greater than 96% and silicon portions less than 0.5%, that powdered silicon of 0.5-5 percent by weight is added as a dispersion and that, depending on the aluminum powder fraction chosen, a sintering temperature between 577 ° and 650 ° C is set.
dadurch gekennzeichnet, daß das Aluminiumausgangsmaterial und der Zuschlagstoff in einer kugelmühle in nicht oxidierender Atmosphäre gemischt werden.3. The method according to claim 1 or 2,
characterized in that the aluminum raw material and the additive are mixed in a ball mill in a non-oxidizing atmosphere.
dadurch gekennzeichnet, daß zur Erzeugung der nicht oxidierenden Ofenatmosphäre Argon als Schutzgas verwendet wird.4. The method according to any one of the preceding claims,
characterized in that argon is used as the protective gas to generate the non-oxidizing furnace atmosphere.
dadurch gekennzeichnet, daß während des Sintervorganges das zu versinternde Pulvermaterial mit einem Bauteil in Kontakt gelangt, dessen chemische Beschaffenheit eine Reaktion an seiner Oberfläche im Bereich der Sintertemperatur erlaubt.5. The method according to any one of the preceding claims,
characterized in that during the sintering process the powder material to be sintered comes into contact with a component whose chemical nature allows a reaction on its surface in the range of the sintering temperature.
dadurch gekennzeichnet, daß das Bauteil aus unvergütetem Aluminium besteht.6. The method according to claim 5,
characterized in that the component consists of unrefined aluminum.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE3809345 | 1988-03-19 | ||
DE3809345A DE3809345A1 (en) | 1988-03-19 | 1988-03-19 | METHOD FOR PRODUCING POROUS COMPONENTS |
Publications (1)
Publication Number | Publication Date |
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EP0334065A1 true EP0334065A1 (en) | 1989-09-27 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP89103620A Withdrawn EP0334065A1 (en) | 1988-03-19 | 1989-03-02 | Process for preparing porous elements |
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EP (1) | EP0334065A1 (en) |
DE (1) | DE3809345A1 (en) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4034637A1 (en) * | 1989-10-31 | 1991-05-02 | Eckart Standard Bronzepulver | Porous sintered aluminium (alloy) body prodn. - from ground mixt. contg. eutectic-forming additive |
JP3007868B2 (en) * | 1997-03-11 | 2000-02-07 | マツダ株式会社 | Porous metal body, light alloy composite member, and production method thereof |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1588346A (en) * | 1968-02-12 | 1970-04-10 | ||
FR2260405A1 (en) * | 1974-02-13 | 1975-09-05 | Alcan Res & Dev | |
JPS5524937A (en) * | 1978-08-10 | 1980-02-22 | N D C Kk | Manufacture of porous sintered body |
JPS5966918A (en) * | 1982-10-12 | 1984-04-16 | Showa Denko Kk | Double layer structure hollow member made of aluminum alloy |
EP0180144A1 (en) * | 1984-10-23 | 1986-05-07 | Inco Alloys International, Inc. | Dispersion strengthened aluminum alloys |
JPS61174353A (en) * | 1985-01-29 | 1986-08-06 | N D C Kk | Porous al-type sintered material |
JPS62188708A (en) * | 1986-02-15 | 1987-08-18 | Sumitomo Metal Ind Ltd | Production of low-oxygen low-carbon metallic powder for sintering |
-
1988
- 1988-03-19 DE DE3809345A patent/DE3809345A1/en not_active Withdrawn
-
1989
- 1989-03-02 EP EP89103620A patent/EP0334065A1/en not_active Withdrawn
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1588346A (en) * | 1968-02-12 | 1970-04-10 | ||
FR2260405A1 (en) * | 1974-02-13 | 1975-09-05 | Alcan Res & Dev | |
JPS5524937A (en) * | 1978-08-10 | 1980-02-22 | N D C Kk | Manufacture of porous sintered body |
JPS5966918A (en) * | 1982-10-12 | 1984-04-16 | Showa Denko Kk | Double layer structure hollow member made of aluminum alloy |
EP0180144A1 (en) * | 1984-10-23 | 1986-05-07 | Inco Alloys International, Inc. | Dispersion strengthened aluminum alloys |
JPS61174353A (en) * | 1985-01-29 | 1986-08-06 | N D C Kk | Porous al-type sintered material |
JPS62188708A (en) * | 1986-02-15 | 1987-08-18 | Sumitomo Metal Ind Ltd | Production of low-oxygen low-carbon metallic powder for sintering |
Non-Patent Citations (4)
Title |
---|
PATENT ABSTRACTS OF JAPAN, Band 10, Nr. 383 (C-393)[2440], 23. Dezember 1984; & JP-A-61 174 353 (NDC K.K.) 06-08-1986 * |
PATENT ABSTRACTS OF JAPAN, Band 12, Nr. 36 (M-664)[2883], 3. Februar 1988; & JP-A-62 188 708 (SUMITOMO METAL IND. LTD) 18-08-1987 * |
PATENT ABSTRACTS OF JAPAN, Band 4, Nr. 57 (M-009)[539], 26. April 1980, Seite 140 M 9; & JP-A-55 24 937 (NIPPON DIA CLEVITE K.K.) 22-02-1980 * |
PATENT ABSTRACTS OF JAPAN, Band 8, Nr. 174 (M-316)[1611], 10. August 1984; & JP-A-59 66 918 (SHOWA DENKO K.K.) 16-04-1984 * |
Also Published As
Publication number | Publication date |
---|---|
DE3809345A1 (en) | 1989-10-05 |
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