EP0438004A1 - Procédé et dispositif d'élaboration de produits composites à matrice métallique - Google Patents

Procédé et dispositif d'élaboration de produits composites à matrice métallique Download PDF

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Publication number
EP0438004A1
EP0438004A1 EP90420550A EP90420550A EP0438004A1 EP 0438004 A1 EP0438004 A1 EP 0438004A1 EP 90420550 A EP90420550 A EP 90420550A EP 90420550 A EP90420550 A EP 90420550A EP 0438004 A1 EP0438004 A1 EP 0438004A1
Authority
EP
European Patent Office
Prior art keywords
bath
product
rotor
metal
stirring
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90420550A
Other languages
German (de)
English (en)
French (fr)
Inventor
Richard Gonda
Laurent Jouet-Pastre
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pechiney Recherche GIE
Original Assignee
Pechiney Recherche GIE
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Pechiney Recherche GIE filed Critical Pechiney Recherche GIE
Publication of EP0438004A1 publication Critical patent/EP0438004A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/0025—Charging or loading melting furnaces with material in the solid state
    • F27D3/0026—Introducing additives into the melt
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/18—Charging particulate material using a fluid carrier

Definitions

  • the present invention relates to a method and a device for producing composite products with a metal matrix constituted in particular by aluminum and its alloys.
  • metals are used in the form of alloys in order to improve in particular their mechanical characteristics.
  • the reinforcing particles whether oxides, carbides, nitrides or other refractory compounds, have great difficulty in being wetted by the metal. It is therefore very difficult, on the one hand to introduce them into the metal and it is sometimes even impossible outside very strict operating conditions, and on the other hand to disperse once in the metal, the harmful clusters on a plane metallurgical, which formed during this difficult introduction.
  • the first can be described as mechanical, since the powder is pushed under the surface by pallets animated by various movements.
  • the second can be described as hydraulic since it is based on the suction of a vortex created in liquid metal.
  • the introduction is not the only problem. Once introduced, the particles must be dispersed by stirring and / or intense shearing of the metal. Admittedly, intense mixing is easy to obtain if the introduction takes place by a mechanical mode: the 2 operations are then compatible.
  • the formation of a vortex requires a centrifugation of the metal, which is incompatible with intense mixing, and even tends to favor a settling of the powder introduced on the side walls.
  • the dispersion of the particles can then only be effective by replacing the impossible stirring with intense shearing, obtained by no longer working with fully liquid metal, but with pasty metal, comprising a non-negligible solid fraction.
  • this is a process in which one starts from an at least partially liquid metal bath subjected to stirring and into which insoluble pulverulent materials are introduced and which is characterized in that one brings by gravity and in a practically rectilinear direction, said product within said bath, a centrifugal force is applied to it substantially perpendicular to the direction of supply, it is brought into contact with the bath around said direction in the form of veins and by printing it a rotational movement whose combination with stirring causes the product to disperse in the bath.
  • the products are introduced in the pulverulent state and the powder is brought directly under the surface of the bath, that is to say away from oxide skins.
  • the introduction under the surface of the bath is preferably carried out so as to bring the product into contact with the bath in at least two veins, which promotes the dispersion of the particles.
  • these particles are desorbed from their moisture before being introduced into the bath in order to avoid any oxidation phenomenon which contributes to developing the oxide skins.
  • the introduction of the particles can be favored by exerting on the latter and in the direction of supply, a gas pressure which cooperates at least partially with the action of gravity, then of the centrifugal force.
  • the rotational movement imparted to the product is preferably carried out at a speed of between 300 and 1500 revolutions per minute; a speed below this limit gives rise to a too low centrifugal force, which does not allow good dispersion.
  • a speed greater than this limit can on the one hand generate too great a centrifugal force which hinders the good flow of the veins, and on the other hand cause vortex effects, whereas one of the objects of the invention is precisely s 'to free it.
  • the bath can also be continuously renewed by adding a new metal bath on one side and drawing off the composite on the other; this is the case for example when the bath is placed in a treatment pocket disposed between an oven and a casting station.
  • the rate of introduction of the product is linked to the rate of the new metal bath added for the renewal of the bath.
  • All pulverulent products can be used in this process, but preferably oxides, carbides, nitrides, borides, silicides, carbon and graphite are chosen.
  • particles preferably having a particle size of between 1 ⁇ m and 5 mm are used, the finer particles wetting poorly and having difficulty flowing in veins, and the larger particles. dispersing so irregular.
  • the percentage of product for reinforcing the bath it is preferably between 3 and 30% by volume, the low percentages hardly make it possible to modify the properties of the metallic matrix and the higher percentages leading to more mixed or less heterogeneous.
  • the invention preferably applies to aluminum alloys and their composite with alumina and silicon carbide.
  • the invention also relates to a device for implementing the method.
  • This device in which means for mixing the bath and means for introducing particles are combined and which comprises a hollow rotor connected at its lower part to a circular disc immersed in the bath contained in an enclosure whose plane is perpendicular to the axis of the rotor, the side wall of which is provided with at least two blades, the mass of which is indented on the top and in the vicinity of its center so as to form a distribution chamber communicating with the hollow part of the rotor and provided on its side wall of substantially radial channels which open into the bath, is characterized in that inside the rotor and without being integral with the latter, a hollow stator elongates which opens into the chamber and communicates with its part upper with a product supply system.
  • the device according to the invention differs from the prior art constituted for example by USP 4802656 by the presence inside the rotor of a stator which ensures the transfer by gravity of the particles of the product between a system of feeding and a chamber, and the transfer, under the action of the centrifugal force created in the chamber, of said particles towards the bath via channels.
  • the particles descend more easily by gravity without being braked by centrifugal force. Indeed, if it was the rotor itself which was used as a descent pipe, the centrifugal force would tend to press the powder on the side walls and therefore slow down the descent.
  • a supply system consisting of a closed hopper, maintained under an atmosphere of dry gas inert to the metal and tightly connected to the stator and the space separating the stator from the rotor is closed by placing a rotary joint there.
  • the rotor has blades at its periphery intended to set the bath in motion. Brewing is intensified and the tendency to vortex reduced by a judicious choice of the orientation of the blades and / or by the introduction of at least one baffle in the enclosure which contains the bath.
  • Such devices can be installed in ovens as well as in ladles or pouring heads.
  • FIG. 1 an axial vertical section view of a device according to the invention, the rotor of which is immersed in a liquid metal bath contained in a crucible and in FIG. 2 a sectional view of the rotor along a horizontal plane of trace XY in FIG. 1.
  • FIG. 1 there is a hollow rotor 1 provided at its lower part with a circular disc 2 immersed in a metallic bath 3 liquid contained in a crucible 4.
  • This disc has, in the vicinity of its center, a chamber 5 distribution which communicates with the hollow part 6 of the rotor.
  • This chamber is provided on its side wall with substantially radial channels 7 which open into the bath on the side wall of the disc, on and / or between these blades 8 with which said wall is fitted.
  • a stator 9 elongates, the lower part of which opens into the distribution chamber and the upper part of which communicates with a hopper 10 for supplying product 11 to be dissolved or dispersed in the mass of the bath.
  • a rotating joint 12 placed between the stator and the rotor allows the chamber to be isolated from the atmosphere.
  • the rotor drive mechanism is not shown.
  • FIG. 2 shows the disc 2 provided with blades 8 having, near its center, a distribution chamber 5 provided on its side wall with channels 7 which open into the bath between the blades 8.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP90420550A 1989-12-18 1990-12-17 Procédé et dispositif d'élaboration de produits composites à matrice métallique Withdrawn EP0438004A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8917536 1989-12-18
FR8917536A FR2656001A1 (fr) 1989-12-18 1989-12-18 Procede et dispositif d'elaboration de produits composites a matrice metallique.

Publications (1)

Publication Number Publication Date
EP0438004A1 true EP0438004A1 (fr) 1991-07-24

Family

ID=9389213

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420550A Withdrawn EP0438004A1 (fr) 1989-12-18 1990-12-17 Procédé et dispositif d'élaboration de produits composites à matrice métallique

Country Status (5)

Country Link
EP (1) EP0438004A1 (no)
JP (1) JPH04210437A (no)
CA (1) CA2032409A1 (no)
FR (1) FR2656001A1 (no)
NO (1) NO905284L (no)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005915A1 (fr) * 1996-08-02 1998-02-12 Pechiney Rhenalu Dispositif rotatif de dispersion de gaz pour le traitement d'un bain d'aluminium liquide
WO2006062482A1 (en) * 2004-12-10 2006-06-15 Magnus Wessen A method of and a device for producing a liquid-solid metal composition
DE102010051341A1 (de) 2010-11-13 2012-05-16 Volkswagen Ag Gießschmelzbehälter zur Aufnahme einer Metallschmelze und Verfahren zur Behandlung von Metallschmelzen
CN107073564A (zh) * 2014-08-20 2017-08-18 曾·卡西纳斯 用于高剪切液体金属处理的装置和方法
CN107469718A (zh) * 2017-08-29 2017-12-15 鼎纳科技有限公司 搅拌子
CN110453117A (zh) * 2019-07-26 2019-11-15 柳州职业技术学院 一种高性能a356铝合金精炼及强韧化热处理工艺方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE532248A (no) *
DE2728173A1 (de) * 1977-06-23 1979-01-04 Rudolf Koppatz Ruehrwerk fuer metallschmelzen
EP0073729A1 (fr) * 1981-08-28 1983-03-09 Aluminium Pechiney Dispositif rotatif de dispersion de gaz pour le traitement d'un bain de métal liquide
EP0245601A2 (en) * 1986-03-05 1987-11-19 Showa Aluminum Corporation Apparatus for treating molten metal
US4759995A (en) * 1983-06-06 1988-07-26 Dural Aluminum Composites Corp. Process for production of metal matrix composites by casting and composite therefrom
EP0332292A1 (en) * 1988-02-24 1989-09-13 Foseco International Limited Rotary device, apparatus and method for treating molten metal

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE532248A (no) *
DE2728173A1 (de) * 1977-06-23 1979-01-04 Rudolf Koppatz Ruehrwerk fuer metallschmelzen
EP0073729A1 (fr) * 1981-08-28 1983-03-09 Aluminium Pechiney Dispositif rotatif de dispersion de gaz pour le traitement d'un bain de métal liquide
US4759995A (en) * 1983-06-06 1988-07-26 Dural Aluminum Composites Corp. Process for production of metal matrix composites by casting and composite therefrom
EP0245601A2 (en) * 1986-03-05 1987-11-19 Showa Aluminum Corporation Apparatus for treating molten metal
EP0332292A1 (en) * 1988-02-24 1989-09-13 Foseco International Limited Rotary device, apparatus and method for treating molten metal

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998005915A1 (fr) * 1996-08-02 1998-02-12 Pechiney Rhenalu Dispositif rotatif de dispersion de gaz pour le traitement d'un bain d'aluminium liquide
US6060013A (en) * 1996-08-02 2000-05-09 Pechiney Rhenalu Rotary gas dispersion device for treating a liquid aluminium bath
WO2006062482A1 (en) * 2004-12-10 2006-06-15 Magnus Wessen A method of and a device for producing a liquid-solid metal composition
US7870885B2 (en) 2004-12-10 2011-01-18 Magnus Wessen Method of and a device for producing a liquid-solid metal composition
DE102010051341A1 (de) 2010-11-13 2012-05-16 Volkswagen Ag Gießschmelzbehälter zur Aufnahme einer Metallschmelze und Verfahren zur Behandlung von Metallschmelzen
DE102010051341B4 (de) 2010-11-13 2022-09-08 Volkswagen Ag Gießschmelzebehälter zur Aufnahme einer Metallschmelze und Verfahren zur Behandlung von Metallschmelzen
CN107073564A (zh) * 2014-08-20 2017-08-18 曾·卡西纳斯 用于高剪切液体金属处理的装置和方法
CN107073564B (zh) * 2014-08-20 2020-03-03 曾·卡西纳斯 用于高剪切液体金属处理的装置和方法
CN107469718A (zh) * 2017-08-29 2017-12-15 鼎纳科技有限公司 搅拌子
CN107469718B (zh) * 2017-08-29 2024-02-02 鼎纳科技有限公司 搅拌子
CN110453117A (zh) * 2019-07-26 2019-11-15 柳州职业技术学院 一种高性能a356铝合金精炼及强韧化热处理工艺方法

Also Published As

Publication number Publication date
FR2656001A1 (fr) 1991-06-21
NO905284D0 (no) 1990-12-06
JPH04210437A (ja) 1992-07-31
CA2032409A1 (fr) 1991-06-19
NO905284L (no) 1991-06-19

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