WO2023286407A1 - Procédé de production de corps composite en aluminium à haute teneur en poudre métallique, procédé de préparation de préforme et corps composite en aluminium à haute teneur en poudre métallique - Google Patents

Procédé de production de corps composite en aluminium à haute teneur en poudre métallique, procédé de préparation de préforme et corps composite en aluminium à haute teneur en poudre métallique Download PDF

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WO2023286407A1
WO2023286407A1 PCT/JP2022/017719 JP2022017719W WO2023286407A1 WO 2023286407 A1 WO2023286407 A1 WO 2023286407A1 JP 2022017719 W JP2022017719 W JP 2022017719W WO 2023286407 A1 WO2023286407 A1 WO 2023286407A1
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powder
metal
preform
metal powder
aluminum composite
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PCT/JP2022/017719
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English (en)
Japanese (ja)
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睦夫 林
修平 勝亦
翔梧 落合
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アドバンスコンポジット株式会社
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Priority to CN202280004772.5A priority Critical patent/CN115812011A/zh
Priority to EP22792730.8A priority patent/EP4144461A1/fr
Publication of WO2023286407A1 publication Critical patent/WO2023286407A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00—Casting in, on, or around objects which form part of the product
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/02—Pressure casting making use of mechanical pressure devices, e.g. cast-forging
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D18/00—Pressure casting; Vacuum casting
    • B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D23/00—Casting processes not provided for in groups B22D1/00 - B22D21/00
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
    • B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
    • B22D27/13—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of gas pressure
    • 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
    • B22F3/24—After-treatment of workpieces or articles
    • B22F3/26—Impregnating
    • 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
    • B22F2998/10—Processes characterised by the sequence of their steps
    • 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
    • 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
    • C22C1/1005—Pretreatment of the non-metallic additives
    • C22C1/1015—Pretreatment of the non-metallic additives by preparing or treating a non-metallic additive preform
    • C22C1/1021—Pretreatment of the non-metallic additives by preparing or treating a non-metallic additive preform the preform being ceramic
    • 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
    • C22C1/1036—Alloys containing non-metals starting from a melt
    • C22C1/1073—Infiltration or casting under mechanical pressure, e.g. squeeze casting

Definitions

  • the present invention relates to a method for producing an aluminum composite containing high metal powder, a method for producing a preform, and an aluminum composite containing high metal powder.
  • the present invention provides an aluminum composite containing a high metal powder, which is obtained by impregnating a preform made of a metal powder with a high volume filling factor with a metal aluminum or an aluminum alloy (hereinafter also referred to as an Al alloy, etc.).
  • the present invention relates to a new technology that can dramatically improve the productivity and quality of composite materials.
  • MMC Metal Matrix Composite
  • silicon metal has a small thermal expansion coefficient, so it is used as electronic and semiconductor parts, but in addition to being extremely fragile, it has the disadvantage of not being able to manufacture complex and large parts. Therefore, a silicon-aluminum composite with an Al alloy or the like is being developed. For the above-mentioned reasons, firstly, a composite with aluminum containing as much silicon powder as possible is desired, and a composite with a small coefficient of thermal expansion and a large Young's modulus while maintaining workability is desired. ing.
  • Titanium metal has a small coefficient of thermal expansion and is used as a wide variety of machine parts as a lightweight and highly rigid metal. However, it has a high hardness and is a difficult-to-work material, which limits its applications. Therefore, if it is possible to improve workability by combining titanium metal with aluminum metal, the range of applications can be further expanded.
  • silicon-containing aluminum alloy powder also called silicon-aluminum alloy
  • silumin containing a silicon component is melted and cast into a sand mold or metal mold.
  • silicon content is high, the flowability of the alloy is lowered and casting becomes impossible. Therefore, it is difficult to produce a high-silicon-aluminum composite with a high metal component content, as desired by the casting method described above.
  • Patent Document 1 Non-pressure impregnation method of aluminum into silicon powder packing
  • a molten Al alloy or the like is added to a filled body or molded body having a silicon powder filling rate of 50 to 70% by volume at a temperature of 700 ° C to 1000 ° C in a nitrogen atmosphere containing magnesium vapor.
  • a pressure infiltrated silicon-aluminum composite metal has been proposed.
  • Patent Literature 1 discloses that by including magnesium vapor in a nitrogen atmosphere, it is possible to speed up the permeation of a molten Al alloy or the like into a filler.
  • a filler obtained by filling a container with a mixture of 100 parts by mass of silicon powder having an average particle size of 5 ⁇ m and 2 parts by mass of magnesium powder is used, and the filling rate of silicon is 50% by volume. It is stated that It is described that silicon powder having an average particle size of 1 to 100 ⁇ m was used, if necessary, in contrast to the above examples.
  • Patent Document 1 magnesium powder is added to one type of silicon powder, this is filled in a container, and the packed body is placed in a nitrogen atmosphere at normal pressure (non-pressurized ) to produce a composite metal by infiltrating a molten Al alloy or the like.
  • a mere filling of silicon powder may be non-uniform or may leave pores inside.
  • the non-pressure infiltration method using the above-mentioned packing cannot produce a metal powder-aluminum composite with a high and uniform metal component content, which is required for products.
  • Patent Document 2 a metal powder such as silicon powder is added with PVA (polyvinyl alcohol) as a binder to form a metal powder compact or calcined body. It has been reported to penetrate in In the example, a material obtained by adding PVA as a binder to silicon powder having an average particle size of 20 ⁇ m was used, and a molded body obtained by press molding was placed in a nitrogen atmosphere furnace in which magnesium was present, and a molten Al alloy was added at normal pressure. It describes obtaining a composite metal by impregnation, using two types of metal powder, and mixing ceramic powder with metal powder.
  • PVA polyvinyl alcohol
  • the advantage of impregnating the filling body or the molded body with molten metal such as Al alloy by non-pressure infiltration is the molded body obtained by press molding metal powder ( It is possible to produce a metal powder-aluminum composite having a shape close to that of a product after impregnation by gently impregnating a molded body with a molten metal such as an Al alloy while maintaining the shape of the preform by capillary action. That is, if it is possible to obtain a composite having a shape close to that of the product after impregnating the molded body with the molten metal, it is possible to reduce the machining required thereafter, which has the advantage of reducing the manufacturing cost.
  • an object of the present invention is to produce a strong molded body (preform) of metal powders represented by powders such as silicon, silicon aluminum alloy, iron, titanium, copper, nickel, ferrosilicon, etc., and achieve target performance.
  • the filling rate of the metal powder can be increased according to the condition, and there are extremely few defects inside, and a technique for producing a uniform preform has been established. It is an object of the present invention to provide an excellent technique capable of obtaining an aluminum composite containing a high metal powder content, which has a high metal content and which causes very little cracking or defects in any case of pressure osmosis.
  • the present invention provides the following method for producing an aluminum composite containing high metal powder.
  • the following manufacturing method for obtaining an aluminum composite containing a high metal powder by impregnating an Al alloy or the like under high pressure is provided.
  • a method for producing a high metal powder-containing aluminum composite having In the preform manufacturing process, two or more kinds of metal powder materials having different average particle sizes are selected from metal powder materials having an average particle size of 1 ⁇ m or more and 200 ⁇ m or less as metal raw materials for preforms, and the metal raw materials Then, the mixture obtained by adding and mixing an organic and inorganic binder is molded, and the obtained molded product is fired at a temperature of 300 ° C. or higher and 800 ° C.
  • a high-metal-powder-containing aluminum composite characterized in that, in the step of impregnating aluminum or the like, the metal powder molded body obtained in the step of making the preform is impregnated with molten aluminum or aluminum alloy at a high pressure of 10 MPa to 200 MPa. body manufacturing method.
  • the organic/inorganic binder is preferably at least one selected from the group consisting of silicone resins, Si alkoxides and Al alkoxides in a liquid state or in a liquid state.
  • a method for producing a high metal powder-containing aluminum composite having In the preform manufacturing process a metal powder material having an average particle size of 1 ⁇ m or more and 200 ⁇ m or less (excluding each powder material of Mg powder, AlMg powder, ZnMg powder, ZnAl powder, and Mg 2 Si powder), average particles Two or more kinds of metal powder materials having different diameters are selected as a metal raw material for a preform, and 100 parts by mass of the metal raw material is composed of Mg powder, AlMg powder, ZnMg powder, ZnAl powder and Mg 2 Si powder. One or more powders selected from the group are added in an amount within the range of 0.2 to 5 parts by mass, and an organic and inorganic binder is added and mixed to form a mixture.
  • the organic/inorganic binder is preferably at least one selected from the group consisting of silicone resins, Si alkoxides and Al alkoxides in a liquid state or in a liquid state.
  • Preferred embodiments of the method for producing the high-metal-powder-containing aluminum composite of the present invention are as follows. [3] The above [1], wherein the metal powder is selected from silicon powder or a silicon-based alloy powder containing silicon, titanium powder, iron powder or an iron-based alloy powder containing iron, and nickel powder or a nickel-based alloy powder containing nickel. Or the method for producing a high metal powder-containing aluminum composite according to [2]. [4] The high metal powder-containing aluminum composite according to any one of the above [1] to [3], wherein the volume content of the metal powder in the high metal powder-containing aluminum composite is 55 v% or more and 85 v% or less. Production method.
  • the two or more types of metal powders having different average particle sizes include at least a metal powder A having an average particle size of 10 ⁇ m or less and a metal powder B having an average particle size of 40 ⁇ m or more.
  • Method. [6] The method for producing a high metal powder-containing aluminum composite according to any one of [1] to [5] above, wherein the organic/inorganic binder is at least one selected from the group consisting of Si alkoxide and Al alkoxide.
  • the present invention provides, as another embodiment, the following method for producing a preform, which is preferably used in the method for producing an aluminum composite containing high metal powder according to the first invention.
  • a preform for obtaining a metal powder molded body (preform) with a high metal powder content, used for obtaining an aluminum composite metal containing a high metal powder content by impregnating molten aluminum or aluminum alloy at high pressure A method of making the A metal powder material having an average particle size of 1 ⁇ m or more and 200 ⁇ m or less includes at least a metal powder A having an average particle size of 10 ⁇ m or less and a metal powder B having an average particle size of 40 ⁇ m or more.
  • the organic/inorganic binder is preferably at least one selected from the group consisting of silicone resins, Si alkoxides and Al alkoxides in a liquid state or in a liquid state.
  • the present invention provides, as another embodiment, the following method for producing a preform that is preferably used in the method for producing an aluminum composite containing high metal powder of the second invention.
  • a method of making a preform comprising: At least metal with an average particle size of 10 ⁇ m or less from metal powder materials with an average particle size of 1 ⁇ m or more and 200 ⁇ m or less (excluding each powder material of Mg powder, AlMg powder, ZnMg powder, ZnAl powder, and Mg 2 Si powder) Powder A and metal powder B having an average particle size of 40 ⁇ m or more, containing at least 3% by mass of the metal powder A in the total amount of the metal powder, and containing 50% or more of the metal powder B, Two or more kinds of metal powder materials having different average particle sizes are selected as metal
  • One or more powders selected from the group consisting of are added in an amount within the range of 0.2 to 5 parts by mass, and an organic and inorganic binder is added and mixed.
  • a method for producing a preform characterized in that the molded product thus obtained is fired at a temperature of 500° C. or less to obtain a metal powder molded product in which the content (volume ratio) of the metal raw material is 55 v % or more.
  • the organic/inorganic binder is preferably at least one selected from the group consisting of silicone resins, Si alkoxides and Al alkoxides in a liquid state or in a liquid state.
  • the present invention provides, as another embodiment, the following high metal powder-containing aluminum composite.
  • a high metal powder-containing aluminum composite with extremely few internal defects such as blowholes the high metal powder using high pressure impregnation according to any one of the above [1], [3] to [6].
  • An aluminum composite containing a high metal powder obtained by a method for producing an aluminum containing composite.
  • a high metal powder-containing aluminum composite obtained by the manufacturing method of.
  • molded bodies (preforms) of metal powders typified by powders of silicon, silicon aluminum alloys, iron, titanium, copper, nickel, ferrosilicon, etc.
  • metals are used according to the target performance.
  • the volume filling rate of the powder can be increased to 55 v % or more, and the resulting preform can be made uniform with extremely few internal defects.
  • both when the preform is impregnated with an Al alloy or the like under high pressure and when it is impregnated without pressure the occurrence of cracks and defects is reduced.
  • a high-metal-powder-containing aluminum composite that can obtain a high-quality high-metal-powder-containing aluminum composite with a high content.
  • a high-quality aluminum composite containing a high amount of metal powder which has extremely few internal defects such as blowholes.
  • These composites can be used, for example, as vacuum components in semiconductors, liquid crystal manufacturing equipment, electron microscopes, optical communication packages, and the like.
  • FIG. 1 is a schematic diagram for explaining the procedure of a pressurized infiltration method for pressurizing and infiltrating a molten metal such as an Al alloy into a preform, which is used in the first method for producing an aluminum composite containing a high metal powder of the present invention.
  • FIG. FIG. 2 is a schematic diagram showing how molten metal such as an Al alloy 2 is poured into a frame mold/die 3 of a press machine for high-pressure impregnation loaded with a preform 1.
  • FIG. Fig. 1(A) is a schematic diagram illustrating a state in which a press punch is installed in an opening of a frame mold/die 3 in which a preform 1 and a molten metal such as an Al alloy 2 are loaded, obtained by the operation of Fig.
  • FIG. 1(A). . 1(B) is a schematic diagram showing a state in which a load (high pressure) is applied to the molten metal in the frame mold/metal mold 3 to impregnate the preform 1 with the molten metal 2 such as an Al alloy.
  • FIG. 2 is a schematic diagram showing an arrangement state of a preform 1 and an Al alloy or the like 2 loaded in a container 5 made of carbon.
  • FIG. 2 is a schematic diagram showing how an Al alloy or the like 2 in a container 5 made of carbon becomes a molten metal, and the molten metal permeates a permeation path 4 supporting the preform 1 without pressure.
  • FIG. 2 is a schematic diagram showing how a molten metal such as an Al alloy 2 permeates into a preform 1 in a carbon container 5 through a permeation path 4 that supports the preform 1 without pressure.
  • FIG. 3 is a schematic diagram showing a state after molten metal such as an Al alloy 2 has permeated the entire preform 1 in a carbon container 5 without pressure.
  • Metal powder material In the present invention, a material having an average particle size of 1 ⁇ m or more and 200 ⁇ m or less is used as a metal powder material for producing a preform.
  • the preform constituting the present invention is produced from a mixture obtained by selecting and mixing two or more kinds of metal powders having different average particle sizes from among the metal powders having an average particle size within this range.
  • a mixture of a metal powder having a large particle size and a metal powder having a small particle size is used. It is preferable to use for example, at least a metal powder A having an average particle size of 10 ⁇ m or less and a metal powder B having an average particle size of 40 ⁇ m or more are included, and the metal powder A is contained at least 3% in the total amount of the metal powder on a mass basis, Moreover, it is preferable that the metal powder B is contained in an amount of 50% or more.
  • Vf volume filling rates
  • Metal powder such as silicon powder has a filling rate that varies depending on its average particle size, particle shape, particle size distribution, etc. Therefore, as a method of obtaining a desired high volume filling rate (v%), for example, it is placed in a carbon container or the like, There is also a method of carefully vibrating the material so that the filling rate is as high as possible, and filling the material with as few voids as possible.
  • the inventors found the following. Two or more kinds of metal powder materials having different average particle sizes are used, and the mixed powder is formed by a molding method such as press molding, CIP molding, or a sedimentation method so that the metal powder is packed as tightly as possible. By doing so, it is possible to manufacture a strong preform that can withstand high-pressure impregnation with a molten metal such as an Al alloy at a high filling rate of 55 v% or more of the metal raw material.
  • a molding method such as press molding, CIP molding, or a sedimentation method
  • an organic/inorganic binder is added to and mixed with the mixture of metal powders composed as described above, and the molded article made of the obtained mixture is fired at a temperature of 300 ° C. or more and 800 ° C. or less. It was found that it is effective to Details of these points will be described later.
  • the present inventors diligently studied the production of a preform having a metal powder raw material content of 55 v% or more, which is capable of infiltrating a molten metal such as an Al alloy without pressurization.
  • molten metal such as an Al alloy can be melted without pressure. can be infiltrated in a good state, and a high quality metal powder-containing aluminum composite can be obtained. That is, for example, the Mg component present in the preform generates Mg 3 N 2 in a nitrogen atmosphere during non-pressure infiltration, which will be described later, and also converts the metal oxide on the metal powder surface to Mg. It is reduced and metallized by a thermite reaction to improve the wettability between the metal powder and the molten metal such as an Al alloy. It is believed that the function of these Mg components constituting the present invention enabled the molten metal such as Al alloy to permeate the manufactured preform in a good state without pressure.
  • a powder having an average particle size of 0.5 ⁇ m or more and 150 ⁇ m or less is not preferred because it is too coarse and may not be uniformly mixed with the metal powder material described above.
  • the particle size is coarse, the surface area of the Mg component becomes small, and the amount of Mg 3 N 2 produced after the Mg contained in the preform reacts with nitrogen in the atmosphere and is nitrided becomes small.
  • the amount of Mg 3 N 2 produced is small, the permeation rate of the Al alloy or the like into the preform becomes slow, which is not preferable.
  • Mg component-containing metal powder or the like having an average particle size of 0.5 ⁇ m or more.
  • the average particle size exceeds 150 ⁇ m, the surface area of the whole becomes small, and as described above, the production amount of Mg 3 N 2 becomes small, which is not preferable.
  • the amount of the Mg component-containing metal powder or the like to be added and mixed is in the range of 0.2 to 5 parts by mass in terms of Mg per 100 parts by mass of the metal powder. More preferably, it is used within the range of 0.5 to 5 parts by mass. If the amount of the Mg component-containing metal powder is less than 0.2 parts by mass, the amount of Mg 3 N 2 produced will be small, and the permeation rate of molten metal such as Al alloy will not be sufficiently accelerated, which is not preferable. On the other hand, if the amount of the Mg component-containing metal powder or the like is more than 5 parts by mass, the distribution state of the Mg component in the preform produced from these raw materials is locally increased, and this causes Al to permeate. This is not preferable because the amount of the alloy, etc. may become non-uniform. When using the Mg-based alloy or the Mg-containing compound as described above, the amount to be mixed may be determined by converting to the Mg contained therein.
  • the metal powder used in the present invention is not particularly limited, and examples thereof include metals such as silicon powder, silicon aluminum alloy powder, ferrosilicon alloy powder, iron or iron-based powder, titanium powder, nickel or nickel-based powder, and the like. powder.
  • metals such as silicon powder, silicon aluminum alloy powder, ferrosilicon alloy powder, iron or iron-based powder, titanium powder, nickel or nickel-based powder, and the like. powder.
  • the mixture for producing the preform used for non-pressure infiltration contains one or more Mg component-containing metal powders, etc. in an amount of 0.2 to 5 parts by mass.
  • the molding is fired at a temperature of 500° C. or less. Therefore, when producing a preform used for non-pressure infiltration, it is necessary not to use any of two or more metal powder materials having different average particle sizes, such as a metal powder containing a Mg component. .
  • the preform when used for high-pressure impregnation, two or more kinds of metal powder materials having different average particle sizes are used in the preparation of the preform, such as Mg component-containing metal powder. You can use it without any problem.
  • the molded product obtained by molding the mixture is fired at a temperature of 300° C. or higher and 800° C. or lower to prepare the preform.
  • the Mg in it for example, is oxidized to MgO, leaving the preform free of the Mg component, which is important during non-pressure infiltration.
  • the metal powder is oxidized and the original properties of the metal are damaged.
  • the composite of the present invention is a composite of metal powder and an Al alloy or the like, and the above-described prior art cannot be used. That is, if a compact obtained by adding and mixing an inorganic binder to metal powder is fired at a temperature of 1000° C. for the purpose of obtaining a high-strength preform, the metal powder is oxidized and its performance as a metal is impaired.
  • the present invention as defined in the present invention, by adding and mixing an organic and inorganic binder to metal powder to obtain a compact, it is possible to sinter in a low temperature range of 300 ° C. to 800 ° C. , it has become possible to produce a preform containing metal powder at a high content rate, and as a result, a remarkable effect of the present invention is obtained.
  • the metal powder In order to strengthen the preform, it is possible to pack the metal powder as densely as possible and pressurize it by the above-described press, CIP, sedimentation method, etc., and add a binder to the raw metal mixed powder. desired.
  • organic substances such as polyvinyl alcohol (PVA) and polyvinyl butyral (PVB) are used as binders for molding ceramics.
  • PVA polyvinyl alcohol
  • PVB polyvinyl butyral
  • gas is generated, which may hinder the impregnation of the Al alloy or the like.
  • the preform In order to prevent this problem, the preform must be baked in advance to remove the organic matter that is the source of gas generation.
  • organic binders such as PVA and PVB cannot be used because they cannot function as binders for strengthening preforms after firing.
  • an inorganic binder such as colloidal silica or colloidal alumina
  • the metal powder which is the main raw material, is oxidized and its function as a metal is impaired. Therefore, general inorganic binders such as colloidal silica and colloidal alumina cannot be used.
  • the present inventors have made intensive studies, and have found that a mixture obtained by adding and mixing two or more kinds of metal powder materials with an organic and inorganic binder is used for molding, and the obtained molded product is a molten Al alloy or the like.
  • the impregnation method by baking at a specific temperature to produce a preform, impregnation of molten metal such as Al alloy under pressure or without pressure can be realized in a good state. It has been found that a good preform can be obtained.
  • Examples of the organic/inorganic binder used in the present invention include silicone resins, silicon organic derivatives such as Si alkoxides having a chemical structure of Si—O—R (R: organic matter), and Al—O—R (R: organic matter).
  • Aluminum organic derivatives such as aluminum alkoxides having the chemical structure of can be used. According to the studies of the present inventors, first, by using a mixture of metal powders to which the above-mentioned organic and inorganic compounds are added as a binder, it is possible to produce a strong molding at room temperature. Then, according to the studies of the present inventors, after that, the obtained molding is fired at a temperature of 300° C. or more and 800° C. or less, which is 800° C.
  • preform a strong metal powder compact (preform) can be obtained after sintering, although the organic matter in the compact is removed by sintering.
  • the organic matter in the molded product is removed, and the inorganic matter acts as an inorganic binder.
  • the content (volume ratio) of the metal raw material is 55 v% or more.
  • a metal powder compact can be obtained. The effect obtained by using the organic/inorganic binder will be described in more detail below.
  • the metal powder is not oxidized even when fired at a high temperature of 800° C. or less, so that a sufficiently strong preform can be manufactured.
  • the above-mentioned organic/inorganic binders have the advantage that the organic matter is decomposed and removed at a temperature of 300° C., so that the organic matter does not generate organic gas when impregnated with a molten Al alloy or the like. .
  • the reason why the above effect was obtained is considered as follows.
  • the organic/inorganic binders used in the present invention such as Si alkoxide, have a molecular structure of Si—O—R (R: organic substance), so compared to general organic binders, the Even at high temperatures, the organic matter is less likely to remain carbonized and is easily removed by burning, so it functions as an inorganic binder for SiO 2 in the molded body after firing, and as a result, the resulting preform exhibits its strength. Seem.
  • the inorganic-organic binder required to be used in the present invention can be used in organic solvents such as ethanol, IPA, toluene, etc., and thus has the advantage of suppressing deterioration due to reaction between metal powder and water.
  • the organic matter is decomposed and removed at a relatively low temperature to obtain a strong preform.
  • this is an important factor for the obtained preform to be impregnated with molten metal such as Al alloy under high pressure or without pressure in good condition.
  • the preform is filled with a molten metal such as an Al alloy at a temperature of 700 ° C. to 800 ° C. Impregnate at high pressure.
  • the preform constituting the present invention can exhibit sufficient strength even against such a high-temperature molten metal. Furthermore, in the present invention, which uses a unique preform, there is no generated gas that is difficult to remove from the inside of the preform, so the inside of the preform can be impregnated with a molten metal such as an Al alloy.
  • a preform manufactured as follows is used.
  • a predetermined amount of Mg component-containing metal powder or the like is mixed in the preform. If these Mg component-containing metal powders or the like are, for example, metal Mg powders or Mg-containing alloy powders, they are oxidized to MgO at a temperature exceeding 500°C, so it is necessary to bake the preform at a temperature of 500°C or less. . Further, according to the studies of the present inventors, in addition to firing the preform at a low temperature of 500° C.
  • the organic inorganic binder described above is used when obtaining a molding by mixing metal powder materials.
  • the Mg component-containing metal powder is not oxidized when the molded product is fired, and a strong preform that does not collapse when a molten metal such as an Al alloy is impregnated without pressure can be obtained. can be manufactured.
  • the organic/inorganic binder used in the present invention may be added after being dissolved in an organic solvent such as ethanol or IPA. Moreover, in the case of a liquid one, it can be added as it is or after being diluted with an organic solvent such as ethanol or IPA. An appropriate amount of an organic solvent such as ethanol or IPA may be added and mixed so that the metal powder raw material and the organic/inorganic binder can be easily mixed.
  • the amount of the organic/inorganic binder used in the present invention is, for example, about 0.3 to 5.0 parts by mass in terms of SiO 2 or Al 2 O 3 with respect to 100 parts by mass of the metal powder raw material. It is preferable to add and mix in the range.
  • the addition amount is less than the above range, it may be too small to obtain the desired strength of the preform. If the addition amount is larger than the above range, the finally obtained aluminum composite will have a large amount of inorganic substances such as SiO 2 and Al 2 O 3 , and the metal content that is the object of the present invention will be high. It is not preferable because there is concern that an aluminum composite containing a high metal powder content with a high modulus cannot be obtained, and the performance of the product is lowered.
  • a mixture obtained by selecting two or more kinds of metal powder materials having mutually different average particle sizes as a metal raw material for a preform, and adding and mixing an organic/inorganic binder such as those listed above to the metal raw material. is molded to obtain a molded product, and the obtained molded product is fired at a specific temperature to produce a preform with high strength.
  • a molded product is obtained by molding a metal powder mixture in which two or more kinds of metal powder materials having different average particle sizes are mixed with an organic-inorganic binder as described above.
  • the molding method of the molded product is not particularly limited, and examples thereof include the following methods.
  • the metal powder mixture is dried and then dry-molded by press molding or CIP to obtain a compact, or the metal powder mixture is slurried using an organic solvent and vibration sedimentation molding is performed. and a method of obtaining a molded product.
  • the metal powder mixture is slurried, it is preferable to reduce the amount of water used and prepare the slurry with an organic solvent. This is because if there is a large amount of water, the metal powder and water may react with each other, and the metal powder may change into hydroxide or the like, resulting in deterioration.
  • the metal powder is silicon powder, the following reaction may progress and silicon may deteriorate. Si + 4H2O ⁇ Si(OH) 4 + 2H2
  • the metal powder is titanium powder
  • the following reaction may progress and titanium may deteriorate. That is, the reaction of Ti+2H 2 O ⁇ TiO 2 +2H 2 turns titanium into an oxide.
  • Other metal powders also react with water to form oxides, so it is basically not preferable to use water.
  • an organic solvent such as alcohol is used, or a mixed solvent of water and a hydrophilic organic solvent such as alcohol is used.
  • press molding which is widely used as a method for obtaining molded articles of powder materials
  • the desired molded article can be easily obtained in the present invention.
  • CIP molding because the density of the obtained molded product can be homogenized by using CIP molding.
  • the molded product obtained as described above is fired (calcined) to obtain a metal powder molded body (preform) having a high metal content.
  • a metal powder molded body preform
  • the preform is fired at a temperature of 300° C. or higher and 800° C. or lower.
  • the preform is fired at a temperature of 500° C. or less, for example, 300° C. or more and 500° C. or less.
  • the organic substances derived from the organic/inorganic binders and the like contained in the molded article are removed. If organic matter remains in the molding, when the Al alloy or the like is permeated into the molding, the high-temperature hot water of the Al alloy or the like and the organic matter come into contact with each other to generate gas, which hinders the permeation of the Al alloy or the like. Therefore, it is necessary to remove the organic matter by firing.
  • the preform which is the original object of the present invention, can be impregnated with a molten Al alloy or the like under either high pressure or non-pressure conditions. It is possible to provide sufficient strength even in the case of Moreover, as described above, if the present invention can produce a near-net high-metal-powder-containing aluminum composite having a shape close to that of the product, the processing cost can be greatly reduced, which is very useful. In order to achieve this purpose, it is necessary to make the preform strong enough to be machined before being impregnated with the molten Al alloy or the like. Firing to produce a preform is important.
  • the temperature conditions for obtaining a metal powder molded body (preform) with a high metal content are as follows. It depends on whether pressurized infiltration is performed. When obtaining a preform for high-pressure impregnation, molten metal such as an Al alloy is impregnated at a relatively high pressure of about 10 MPa to 100 MPa, so the preform to be used must have strength to withstand this pressure. However, according to the studies of the present inventors, if the firing temperature is too high, the metal powder, which is the raw material of the preform, is oxidized. Further, in order to sufficiently remove the organic matter derived from the organic/inorganic binder added to the metal powder, it is necessary to bake at a temperature of 300° C. or higher.
  • the preform to be subjected to infiltration when obtaining a preform subjected to non-pressurized infiltration, stress is generated in the part of the preform that is in contact with molten metal such as an Al alloy. A durable preform strength is required. Therefore, similar to preforms subjected to high-pressure impregnation, sintering removes the organic matter from the molding and improves the strength of the resulting preform.
  • the preform to be subjected to infiltration in order to infiltrate molten metal such as an Al alloy in a good state without pressure, the preform to be subjected to infiltration must be the Mg metal described above. It is required to be in a state in which Mg component-containing metal powder such as powder is added.
  • the firing temperature must be 500° C. or lower.
  • a preform having a high metal content can be obtained by firing at a temperature of 300° C. or more and 450° C. or less, and the organic matter can be sufficiently removed by firing. It becomes possible to make it strong enough to withstand non-pressurized penetration.
  • FIG. 1(A) Metal for high-pressure impregnation of Al alloy or the like into preform
  • FIG. 1(A) a preform 1 having a high metal content is heated to 300° C. to 800° C. and loaded into a preheated press frame/die 3 .
  • the reason why the preform 1 is preheated and loaded is that when the preform 1 is impregnated with molten metal such as an Al alloy 2 under high pressure, if the temperature of the preform 1 is low, the Al alloy 2 is cooled during the high pressure impregnation. This is to prevent the preform 1 from solidifying and impregnating into the inside of the preform 1 .
  • the frame/mold 3 should be heated (preheated) to 200 to 400° C. with a burner or the like so that the Al alloy or the like 2 does not cool and solidify during the impregnation.
  • An Al alloy or the like 2 melted at 600° C. to 800° C. is poured into the frame/mold 3 loaded with the preform 1 as described above, and as shown in FIGS. 1(B) and 1(C). , a load is applied by an upper punch, and the preform 1 is isotropically impregnated with the molten Al alloy 2 or the like.
  • the pressing pressure is 10Mpa to 200Mpa. If the pressure is less than 10 MPa, the pressure is too low and the preform 1 may not be impregnated with the molten Al alloy 2, which is not preferable.
  • the impregnation may be carried out at a higher pressure of over 200 MPa, the pressing pressure within the range described above is sufficient for the ability of the apparatus to obtain the composite of the present invention.
  • the press-impregnated body thus obtained is cooled and the aluminum around the preform is removed to obtain the high-metal-powder-containing aluminum composite which is the object of the present invention.
  • Non-pressure infiltration method of Al alloy etc. into preform 2A to 2D schematically show stepwise conceptual diagrams of non-pressure infiltration.
  • a preform 1 containing Mg component-containing metal powder such as Mg metal powder and having a high metal content is arranged as described below, and placed in an electric furnace (not shown) capable of ensuring a nitrogen atmosphere. to load.
  • an electric furnace (not shown) capable of ensuring a nitrogen atmosphere. to load.
  • a small piece, preferably of the same material as the preform 1 is arranged as an infiltration channel 4.
  • a solid Al alloy or the like 2 to be permeated is placed in the vicinity of the preform 1 so as not to come into contact with it.
  • the preform 1 and the Al alloy or the like 2 are placed in a carbon container 5 and loaded into the electric furnace as shown in FIG.
  • the temperature is gradually raised while maintaining the nitrogen atmosphere inside the electric furnace to 700 to 900 ° C. for 2 hours. Hold for ⁇ 5 hours. During this time, as shown step by step in the schematic diagrams of FIGS. A powder-containing aluminum composite is obtained.
  • Mg component-containing metal powder or the like is Mg powder
  • the principle of obtaining an excellent high-metal-powder-containing aluminum composite by non-pressure infiltration having the above-described structure is considered as follows. Mg reacts with nitrogen to form Mg 3 N 2 , which precipitates in the preform to improve the wettability with an Al alloy or the like, or Mg undergoes a thermite reaction to form the preform. This is probably because the surface oxide of the metal powder on the surface is reduced and the wettability between the metal powder and the Al alloy is improved. As described above, in the prior art, a molded product obtained by press molding or the like is used for non-pressure infiltration without being fired.
  • a method is performed in which a molded article containing no M is used and is placed in a nitrogen atmosphere containing magnesium vapor to allow Al metal to permeate.
  • Mg vapor and nitrogen in the atmosphere react to form Mg 3 N 2 on the surface of the preform, and in this state, Al alloys and the like are formed. Since it will permeate, it takes a long time to impregnate the entire preform with aluminum.
  • Mg 3 N 2 is not generated uniformly on the surface of the preform, there have been cases where the Al alloy or the like permeates unevenly and the entire preform is not uniformly impregnated.
  • Mg powder can be uniformly mixed in the preform unlike the above-described conventional technique, so that Mg 3 N 2 is generated throughout the preform. For this reason, the impregnation speed of the Al alloy or the like is remarkably increased, and the entire preform can be uniformly impregnated.
  • non-pressurized infiltration it is possible to infiltrate an Al alloy or the like while maintaining the shape of the preform. There is a big merit that processing can be reduced.
  • w% is based on mass
  • v% is based on volume.
  • the average particle size in this specification is a value measured with a laser diffraction particle size distribution analyzer.
  • Example 1 (using high-pressure impregnation method) First, a metal powder compact (preform) having a high metal content was produced by the following procedure.
  • three types of silicon (silicon) powders having different average particle sizes were combined according to the following formulations and mixed by stirring to produce a preform. Specifically, 1820 g of silicon powder with an average particle size of 45 ⁇ m, 780 g of silicon powder with an average particle size of 25 ⁇ m, and 100 g of silicon powder with an average particle size of 5 ⁇ m are blended, and a total of 2700 g of the average particle size is mixed with each other. A mixture of three different silicon powders was used.
  • ethyl silicate which is an organic/inorganic binder containing 40 wt% of silicon in terms of SiO 2 .
  • the entire mixed powder obtained above was placed in a press mold having internal dimensions of 200 mm ⁇ 200 mm ⁇ 150 mm (depth), and press molding was performed at a total pressure of 120 tons of 300 kg/cm 2 . Then, the obtained press-molded product was placed in an electric furnace, heated to 700° C. at a temperature increase rate of 50° C./hr, held at this temperature for 3 hours, and then cooled to room temperature to form a silicon metal. A preform was produced. The weight and outer dimensions of this preform were measured, and the bulk density was calculated.
  • the preform obtained above is preheated to 500°C in an electric furnace, and the preheated preform is subjected to high-pressure impregnation. Loaded into a mold/mold. An aluminum alloy (AC4C) melted at 750°C is put into this frame/mold up to about 20 mm above the mold, a press punch is pushed into the frame/mold from above, and held for 10 minutes at a pressure of 100 Mpa. Then, the previously obtained silicon preform was impregnated with molten aluminum under high pressure (see FIGS. 1A to 1C).
  • AC4C aluminum alloy
  • the product part was a silicon-aluminum composite (hereinafter also referred to as a silicon-aluminum composite) uniformly impregnated with aluminum without small pores (blowholes) or cracks.
  • a silicon-aluminum composite uniformly impregnated with aluminum without small pores (blowholes) or cracks.
  • Example 2 (Using a non-pressure permeation method) A metal powder compact (preform) having a high metal content used in this example was produced by the following procedure. 50 g of Mg powder with an average particle size of 80 ⁇ m was added to a total of 2700 g of three kinds of silicon powders with different average particle sizes weighed so as to have the same formulation as used in Example 1. Furthermore, 130 g of ethyl silicate was added to this mixture in the same manner as in Example 1, and mixed with a stirrer for 10 minutes.
  • the entire mixed powder obtained above was placed in a press mold having internal dimensions of 200 mm ⁇ 200 mm ⁇ 150 mm (depth), and press molding was performed at a total pressure of 60 tons of 150 kg/cm 2 . This was removed from the mold, and the obtained pressed product was placed in a normal air atmosphere electric furnace, heated to 450°C at a heating rate of 50°C/hr, held at this temperature for 3 hours, and then cooled.
  • a preform was produced by When the bulk density was calculated in the same manner as in Example 1, the volume filling factor (Vf) was 73%.
  • the preform obtained above was placed in the carbon container 5 so as to form the "non-pressurized permeation principle diagram" schematically shown in FIGS. 2(A) to 2(D). Specifically, four infiltration channels 4 each having a size of 30 mm ⁇ 30 mm ⁇ 30 mm, which are prepared from the same material as the preform 1 obtained above, are placed under the preform 1 in a grounded state. Furthermore, next to the preform 1, 2500 g of solid aluminum alloy (AC4A) 2 was placed. Then, the entire carbon container 5 in which the preform 1 and the like were arranged as described above was placed in a nitrogen atmosphere furnace, heated at a rate of 50° C./hr, held at 800° C. for 5 hours, and then cooled.
  • AC4A solid aluminum alloy
  • the permeation path 4 was removed, and the surface and interior of the impregnated preform 6 were processed and observed. confirmed. From the weight of the obtained silicon-aluminum composite and the bulk specific gravity calculated from the measured value of the outer shape, the composite was 73 v% silicon, 26 v% aluminum alloy, and had no pores or cracks. rice field.
  • Example 3 (using high-pressure impregnation method) A metal powder compact (preform) having a high metal content used in this example was produced by the following procedure. 1,820 g of silicon powder with an average particle size of 80 ⁇ m, 780 g of silicon powder with an average particle size of 25 ⁇ m, and 100 g of silicon powder with an average particle size of 3 ⁇ m, totaling 2,700 g. A mixture of silicon powders was used.
  • Example 1 To this mixture, 180 g of an isopropyl alcohol solution in which a silicone resin (manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KR-220L) was dissolved so as to be 30 w% was added, and after stirring with a stirrer for 15 minutes, the same procedure as in Example 1 was performed. The entire amount was charged into a press mold and press-molded under the same conditions as in Example 1. Then, the obtained press-molded product was placed in an electric furnace, heated to 750° C. at a heating rate of 70° C./hr, and fired at this temperature to obtain a preform having a volumetric filling rate of 78 v %. The volume filling factor was obtained in the same manner as in Example 1.
  • a silicone resin manufactured by Shin-Etsu Chemical Co., Ltd., trade name: KR-220L
  • the preform obtained above was impregnated with a molten aluminum alloy using a high-pressure impregnation press under the same conditions and procedures as in Example 1. After cooling, the surrounding aluminum was removed by machining, the product part was taken out, its weight and outer shape were measured, and the bulk specific gravity was calculated. As a result, it was confirmed that the obtained composite was a silicon-aluminum composite containing 78 v% silicon and 22 v% aluminum alloy, and free of pores (blowholes) and cracks.
  • Example 4 (Using a non-pressure permeation method) A metal powder compact (preform) having a high metal content used in this example was produced by the following procedure. A preform containing Mg powder and having a shape of 200 mm ⁇ 200 mm ⁇ 40 mm, produced by the same procedure as in Example 2, was machined with a milling cutter. Specifically, a preform having a rib structure was obtained in which four cavities of 75 mm ⁇ 75 mm ⁇ 25 mm (depth) were evenly arranged in the preform obtained above. The resulting preform was a strong preform with machinable strength.
  • Example 2 non-pressure infiltration of the aluminum alloy (AC4A) was performed from the infiltration path under the preform placed in a carbon container. Then, in the same manner as in Example 2, the permeation channel was removed and the bulk specific gravity was measured. Confirmed that it was obtained. In addition, there was no exudation of the aluminum alloy inside the cavity, and the silicon-aluminum composite could be manufactured in a near-net state in the shape of the preform.
  • AC4A aluminum alloy
  • Example 5 (using high-pressure impregnation method) A metal powder compact (preform) having a high metal content used in this example was produced by the following procedure. To 1400 g of iron powder having an average particle size of 80 ⁇ m and 600 g of iron powder having an average particle size of 10 ⁇ m, 80 g of ethyl silicate containing 40 wt % of silicon (calculated as SiO 2 ) was added and mixed with stirring for 15 minutes. This mixed powder was placed in a press mold having internal dimensions of 200 mm ⁇ 200 mm ⁇ 150 mm (depth), and press molding was performed at a total pressure of 60 tons of 150 kg/cm 2 . Then, the press-formed product is placed in an electric furnace, heated to 700° C. at a temperature increase rate of 50° C./hr, held at this temperature for 3 hours, and then cooled to room temperature to obtain a preform made of iron metal. made. The weight and outer dimensions of the obtained preform were measured, and the bulk density was calculated.
  • the preform obtained above to 500°C in an electric furnace and perform high-pressure impregnation it is placed in a frame/mold with a depth of 300mm ⁇ x 250mm that is heated to 250°C by a burner of a high-pressure impregnation press. loaded.
  • An aluminum alloy (AC4C) melted at 750°C is put into this frame/mold up to about 20 mm above the frame/mold, a press punch is pushed into the frame/mold from above, and a pressure of 100 Mpa is applied for 10 minutes. High pressure impregnation was performed while holding.
  • the surrounding aluminum was processed and removed, and the product part of the iron-aluminum alloy composite (hereinafter also referred to as the iron-aluminum composite) was taken out.
  • the product part was an iron-aluminum composite with no small pores (blowholes) or cracks, in which a preform made of iron powder was uniformly impregnated with aluminum.
  • the bulk specific gravity was calculated from weight measurement and external dimension measurement, it was found to be an iron-aluminum composite containing 73 v% iron and 27 v% aluminum alloy.
  • Example 1 (Binder not used, high pressure impregnation method used) The silicon mixed powder having the same composition and weight as in Example 1 was put into a 200 mm ⁇ 200 mm ⁇ 100 mm iron box as it was without adding a binder such as silicone resin or ethyl silicate. The filling was performed by vibrating for a minute. Then, the entire box was impregnated with aluminum at high pressure in the same manner as in Example 1, and after cooling, the composite was cut out.
  • a binder such as silicone resin or ethyl silicate
  • Example 3 (Binder not used, preform produced by sedimentation molding) A slurry was prepared using the mixed powder of silicon having the same composition and weight as in Example 3 without adding a binder such as a silicone resin or ethyl silicate, and the slurry was subjected to sedimentation molding. When this was dried, the resulting molded body was found to be weak and brittle, such that it would crumble when touched by hand. In addition, when a part of the molded body was heated to 700 ° C. in the same manner as in Example 1, it had almost no strength and was so fragile that it collapsed immediately. It wasn't something you could use.
  • a binder such as a silicone resin or ethyl silicate
  • Example 5 (Use of organic/inorganic binder, calcination at 850°C to produce preform)
  • the same amount of mixed silicon powder prepared by adding the same amount of ethyl silicate as an organic/inorganic binder to the mixture of three kinds of silicon powders having different average particle sizes and mixing them with stirring was used in Example 1.
  • Press molding was performed in the same manner as in Example 1.
  • the obtained press-molded product is placed in an electric furnace, heated to 850° C. at a heating rate of 50° C./hr, held at this temperature for 3 hours to be fired, and then cooled to room temperature to obtain a silicon preform. made.
  • Example 2 In the same way as in Example 2, the preform (fired body) obtained above was tried to be impregnated with a molten aluminum alloy without pressure. However, the aluminum alloy did not permeate the preform (fired body) without pressure. The reason for this is thought to be that the Mg added to the pressed product was oxidized to MgO by firing at 570° C., and could not contribute to non-pressure penetration.
  • the preform using 45 ⁇ m silicon powder had a filling rate of 50 v%
  • the preform using 25 ⁇ m silicon powder had a filling rate of 52 v%
  • the preform using 5 ⁇ m silicon powder had a filling rate of 52 v%.
  • the filling rate was 53 v%.
  • Table 1 summarizes the preform manufacturing conditions, the method of impregnating the Al alloy, etc., and the properties of the obtained high-metal powder-containing aluminum composites, which were carried out in Examples and Comparative Examples.

Abstract

La présente invention établit une technique de préparation permettant d'augmenter le pourcentage de remplissage en poudre métallique et d'obtenir une préforme de poudre métallique uniforme dépourvue de défauts internes, et porte ainsi sur une technique au moyen de laquelle la préforme est imprégnée d'un alliage d'Al, etc., sous haute pression ou est soumise à une infiltration de métal sans pression, afin d'obtenir un composite en aluminium à haute teneur en poudre métallique présentant une haute teneur en métal et une faible incidence de fissures et de défauts.　La présente invention concerne un procédé de production d'un corps composite en aluminium à haute teneur en poudre métallique. Selon le procédé, dans une étape de préparation de préforme, au moins deux types de matériaux présentant des diamètres de particule différents sont choisis parmi des matériaux de poudre métallique mesurant 1-200 mm ; un produit moulé, obtenu à partir d'un matériau auquel un liant organique-inorganique est ajouté et mélangé avec les matières premières métalliques ci-dessus, est cuit à une température égale ou supérieure à 300 °C ; une préforme présentant une teneur en matière première métallique égale ou supérieure à 55 % en volume est obtenue ; et la préforme obtenue est imprégnée, à une haute pression ou sans mise sous pression, d'un métal fondu tel que celui d'un alliage d'aluminium, ou pénétrée par ce dernier. La présente invention concerne également un corps composite produit par le procédé de fabrication, et un procédé de préparation de la préforme ci-dessus.
PCT/JP2022/017719 2021-07-14 2022-04-13 Procédé de production de corps composite en aluminium à haute teneur en poudre métallique, procédé de préparation de préforme et corps composite en aluminium à haute teneur en poudre métallique WO2023286407A1 (fr)

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EP22792730.8A EP4144461A1 (fr) 2021-07-14 2022-04-13 Procédé de production de corps composite en aluminium à haute teneur en poudre métallique, procédé de préparation de préforme et corps composite en aluminium à haute teneur en poudre métallique

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JPH10280082A (ja) * 1997-04-11 1998-10-20 Sumitomo Electric Ind Ltd 複合合金部材及びその製造方法
JP2001123234A (ja) * 1999-10-21 2001-05-08 Taiheiyo Cement Corp 金属−セラミックス複合材料の製造方法
JP2001262249A (ja) * 2000-03-14 2001-09-26 Taiheiyo Cement Corp 金属−セラミックス複合材料の製造方法
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