EP0437153A1 - Procédé et dispositif pour la coulée continue de composites à matrice métallique renforcée par des particules d'un matériau céramique réfractaire - Google Patents

Procédé et dispositif pour la coulée continue de composites à matrice métallique renforcée par des particules d'un matériau céramique réfractaire Download PDF

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Publication number
EP0437153A1
EP0437153A1 EP90420579A EP90420579A EP0437153A1 EP 0437153 A1 EP0437153 A1 EP 0437153A1 EP 90420579 A EP90420579 A EP 90420579A EP 90420579 A EP90420579 A EP 90420579A EP 0437153 A1 EP0437153 A1 EP 0437153A1
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EP
European Patent Office
Prior art keywords
mold
axis
metal
discs
casting
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Withdrawn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
EP90420579A
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German (de)
English (en)
French (fr)
Inventor
Jean-Luc Meyer
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 EP0437153A1 publication Critical patent/EP0437153A1/fr
Withdrawn legal-status Critical Current

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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
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/11—Treating the molten metal
    • B22D11/114—Treating the molten metal by using agitating or vibrating means
    • B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths

Definitions

  • the invention relates to a process for the continuous casting of a liquid composite with a metal matrix reinforced by particles of a refractory ceramic material.
  • These refractory ceramic materials consist of non-metallic substances, having a melting temperature higher than that of the matrix in which they are incorporated, and which are unassailable or little attackable by the molten metal of the matrix.
  • These materials can be in the form of long or short fibers or of particles or whiskers of suitable particle size.
  • the invention relates to the manufacture of composites based on particles or whiskers.
  • the invention relates to this second type and in particular to a process for the continuous casting of composites prepared according to a foundry technique.
  • CMM metal matrix composites
  • the object of the invention is to propose a method and a continuous casting equipment suitable for CMM casting, that is to say in which the stirring necessary for suspending the ceramic particles in the liquid matrix continues during the casting of the semi-finished product in the still liquid part of this semi-finished product that specialists call the "swamp".
  • the process of the invention is not limited to the casting of a liquid CMM obtained by the process of French patent application 89-16000; it applies to the pouring of any liquid CMM prepared by any process .
  • the process consists in creating an electromagnetic stirring which ensures mixing movements characterized by the fact that they are located in meridian planes containing the pouring axis. To be able to ensure this stirring in good conditions of suspension and dispersion of the particles, the stirred area must be sufficient. For this, it is necessary to precede the "ingot mold" part as can be encountered conventionally in a continuous casting by an upstream thermally insulated part. , which constitutes a hot zone and which has the effect of increasing the volume of the marsh.
  • FIG. 1 represents an exemplary embodiment of the invention.
  • the device intended for pouring, solidifying and extracting the CMM will be described successively, then the three types of electromagnetic devices intended to ensure the mixing of the metal.
  • FIG. 1 and the description of the casting, solidification and three types of electromagnetic stirring devices relate to a particular embodiment of the invention: that of vertical casting. Similar devices, having the same function are found in another embodiment of the invention: that of the horizontal casting.
  • the already solidified product serves as a mold for the solidification of the metal fed continuously and one arrives at a state of equilibrium shown in FIG. 1: From the ingot mold develops a solidified outer envelope while inside the cast product is established a solidification front 7 having the approximate shape shown in the figure. Below this front, the metal is completely solid above, in what is called the "swamp", there is a mixture of liquid and ceramic particles.
  • the electromagnetic stirring device the combination of which with the casting device constitutes the invention is preferably one of the three described below.
  • the first type consists in passing a single-phase electric current of frequency lower or equal to the industrial frequency within the ingot mold constituted, at least partially by an electrically conductive material.
  • the wall of this ingot mold must then present on all its thickness and along at least one generator an electrical insulating insert on either side of which the current leads are fixed.
  • ingot mold plays the role of a whorl and the current flowing through it generates a magnetic field which develops electromagnetic forces generating the desired movement.
  • the internal wall of this ingot mold must be covered with an insulating film to avoid short circuits by the cast metal.
  • the electromagnetic forces being a function of the current intensity, we will choose for the ingot mold a metal good conductor of the current. This can be, for example copper or aluminum or their alloys for the casting of aluminum.
  • the insulating film may consist of an oxide layer obtained by anodization in the case of aluminum, an enamel, or a fluocarbon resin.
  • the thickness of this film depends on the tension of the wall of the ingot mold compared to the cast metal. An oxide thickness of 1 micrometer is suitable for a voltage of 100 volts.
  • this ring can be divided into at least two sectors to avoid any Joule effect in an area which one wishes to cool and a reduction in energy which would limit movements metal.
  • the second type of brewing device ( Figure 1) consists in placing at the outside of the ingot mold at least one metal coil 9 of axis substantially parallel to the axis of the mold in which a single-phase current of frequency less than or equal to the industrial frequency is passed.
  • This coil, electrically insulated of the wall of the mold creates a magnetic field parallel to the axis of the mold which develops electromagnetic forces causing the stirring according to arrows 10 and 11.
  • This stirring is more or less ample depending on the intensity of the current in the coil and according to other factors such as the composition and the structure of the ingot mold.
  • composition it is preferable to use a material having a resistivity greater than 5 microohm.cm, for example a non-magnetic stainless steel, titanium, or a ceramic with sufficient thermal conductivity, or a composite material such as stainless steel coated with a thin layer of aluminum.
  • a material having a resistivity greater than 5 microohm.cm for example a non-magnetic stainless steel, titanium, or a ceramic with sufficient thermal conductivity, or a composite material such as stainless steel coated with a thin layer of aluminum.
  • i concerns the structure, it is possible, in order to reduce the intensity necessary for stirring, to divide the mold according to its generators in at least two sectors separated from each other by an electrical insulator such as mica, these sectors being joined together by stainless steel pins and insulating dowels. All these types of ingot molds can also be lined on their internal wall in the vicinity of the hot zone with a coaxial graphite ring preferably shared along its generators in at least two sections, this in order to improve the efficiency of the electric
  • the turns surrounding the ingot mold are designed and mounted so as to adapt to any form of ingot mold and to optimize the current-force output and the distribution of forces in the metal in order to distribute the stirring over the entire section and the height of the mold and obtain the greatest possible homogeneity of the particles within the liquid metal.
  • This is how the turns can be moved parallel to the axis of the mold or be formed by an assembly of removable elements capable of circumscribe molds of any section equidistantly, or at different distances.These assemblies are perfectly suited for rectangular sections.
  • the cold zone can be surrounded by magnetic yoke elements formed from metal sheets isolated from one another and situated in planes passing through the axis of the mold.
  • the hot zone or at least its part closest to the cold zone can be surrounded by a sheath in which circulates a gas under pressure and chemically inert vis-à-vis the cast metal; it is then found that the cast product has a better surface condition.
  • the third type of mixing device consists of one or more inductors supplied with polyphase current surrounding the entire casting device, hot zone and cold zone.
  • any type of current with n phases can be used; in practice we will obviously use the three-phase current: this is what is illustrated in figure 2.
  • six successive windings: A, B, C, D, E, F have been represented from top to bottom of the figure These windings are placed in planes perpendicular to the casting axis. They are supplied in a similar way to that of the supply of linear induction motors respectively by phases 1, -2, 3, -1, 2. , -3 so as to create an ascending, descending or periodically ascending then descending vertical sliding field, in the order in which the three phases are supplied.
  • the chamber consists of an inner wall, cylindrical or prismatic, depending on the shape of the cast product, preferably in insulating or weakly conductive material of the electricity, but in any case non-magnetic 16 and an external wall, also with cylindrical or prismatic internal surface, which may consist of a magnetic yoke 12.
  • the water chamber is closed at its upper and lower parts by two pieces 18 and 19 joined together by a threaded tie rod 20 whose role is also to ensure the tightening of the discs forming the winding by means of two nuts 21 and 22. Its central part, in contact with the copper discs is insulated. A water inlet 23 and an outlet 24 are arranged respectively at the bottom and at the top of the chamber. The stacks of copper discs 13 and of insulator 15 are arranged inside the chamber. The copper discs and d insulation are drilled with holes, judiciously distributed to constitute the cooling conduits 25 and allow the passage of the tie rods.
  • the ingot mold is cooled by a water chamber, we can take advantage of this solution by placing the coils directly in this chamber ( Figure 6)
  • the internal wall of the chamber is in this case the ingot mold itself 26 which is coated upstream (hot part) with a thermally insulating material 27 and downstream (cold part) with a graphite ring 28. solid part 29 of the product during casting delimited by the front 30.
  • the water which arrives at 31 serves not only to cool the windings 32 by means of the holes 33, and the ingot mold by passing through the gap 34, but also to form the blade of water 35 which trickles over the product 36.
  • a valve 37 located on the output circuit 38 of the winding cooling makes it possible to control the respective quantities circulating in each of the passages.
  • the rest of the technology is similar to what has been described for figure 5.
  • the billet obtained exhibited, with the exception of the extreme periphery, which is conventional in continuous casting of aluminum alloy, a homogeneous structure with good dispersion of the particles within the matrix, whereas '' in the absence of electromagnetic stirring according to the invention described, wide ranges of matrix without particles, these ranges up to 200 micrometers, have been observed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)
  • Manufacture Of Alloys Or Alloy Compounds (AREA)
EP90420579A 1990-01-04 1990-12-28 Procédé et dispositif pour la coulée continue de composites à matrice métallique renforcée par des particules d'un matériau céramique réfractaire Withdrawn EP0437153A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9000515A FR2656551A1 (fr) 1990-01-04 1990-01-04 Procede et dispositif pour la coulee continue de composites a matrice metallique renforcee par des particules d'un materiau ceramique refractaire.
FR9000515 1990-01-04

Publications (1)

Publication Number Publication Date
EP0437153A1 true EP0437153A1 (fr) 1991-07-17

Family

ID=9392862

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420579A Withdrawn EP0437153A1 (fr) 1990-01-04 1990-12-28 Procédé et dispositif pour la coulée continue de composites à matrice métallique renforcée par des particules d'un matériau céramique réfractaire

Country Status (6)

Country Link
EP (1) EP0437153A1 (pt)
JP (1) JPH0768346A (pt)
BR (1) BR9100015A (pt)
CA (1) CA2033232A1 (pt)
FR (1) FR2656551A1 (pt)
NO (1) NO910020L (pt)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6253831B1 (en) * 1997-04-28 2001-07-03 Toyota Jidosha Kabushiki Kaisha Casting process for producing metal matrix composite
US20120060648A1 (en) * 2009-05-25 2012-03-15 Jiangsu University Method for producing multiphase particle-reinforced metal matrix composites
WO2015113502A1 (zh) * 2014-01-28 2015-08-06 中广核工程有限公司 连续铸轧制备b4c/al中子吸收材料板材的方法
CN109014098A (zh) * 2018-08-29 2018-12-18 昆明理工大学 一种陶瓷颗粒增强金属基复合材料的连铸成形装置及方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE1016550A3 (fr) * 2005-03-16 2007-01-09 Ct Rech Metallurgiques Asbl Procede pour couler en continu un metal a resistance mecanique amelioree et produit obtenu par le procede.
CN110252975B (zh) * 2019-08-01 2022-01-07 上海大学 复合时变磁场的电磁搅拌生成装置、方法及应用

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2013542A (en) * 1978-02-01 1979-08-15 Concast Ag A Continuous Casting of Steel in a Mould With Electromagnetic Stirring
US4200137A (en) * 1975-04-22 1980-04-29 Republic Steel Corporation Process and apparatus for the continuous casting of metal using electromagnetic stirring
EP0069270A1 (en) * 1981-07-02 1983-01-12 Alumax Inc. Process and apparatus having improved efficiency for producing a semi-solid slurry
EP0086637A1 (en) * 1982-02-12 1983-08-24 British Steel Corporation Treatment of molten materials
US4473103A (en) * 1982-01-29 1984-09-25 International Telephone And Telegraph Corporation Continuous production of metal alloy composites
WO1989012515A1 (en) * 1988-06-16 1989-12-28 Massachusetts Institute Of Technology Method and apparatus for continuous casting of composites

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4200137A (en) * 1975-04-22 1980-04-29 Republic Steel Corporation Process and apparatus for the continuous casting of metal using electromagnetic stirring
GB2013542A (en) * 1978-02-01 1979-08-15 Concast Ag A Continuous Casting of Steel in a Mould With Electromagnetic Stirring
EP0069270A1 (en) * 1981-07-02 1983-01-12 Alumax Inc. Process and apparatus having improved efficiency for producing a semi-solid slurry
US4473103A (en) * 1982-01-29 1984-09-25 International Telephone And Telegraph Corporation Continuous production of metal alloy composites
EP0086637A1 (en) * 1982-02-12 1983-08-24 British Steel Corporation Treatment of molten materials
WO1989012515A1 (en) * 1988-06-16 1989-12-28 Massachusetts Institute Of Technology Method and apparatus for continuous casting of composites

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6253831B1 (en) * 1997-04-28 2001-07-03 Toyota Jidosha Kabushiki Kaisha Casting process for producing metal matrix composite
US20120060648A1 (en) * 2009-05-25 2012-03-15 Jiangsu University Method for producing multiphase particle-reinforced metal matrix composites
WO2015113502A1 (zh) * 2014-01-28 2015-08-06 中广核工程有限公司 连续铸轧制备b4c/al中子吸收材料板材的方法
CN109014098A (zh) * 2018-08-29 2018-12-18 昆明理工大学 一种陶瓷颗粒增强金属基复合材料的连铸成形装置及方法
CN109014098B (zh) * 2018-08-29 2020-11-17 昆明理工大学 一种陶瓷颗粒增强金属基复合材料的连铸成形装置及方法

Also Published As

Publication number Publication date
BR9100015A (pt) 1991-10-22
JPH0768346A (ja) 1995-03-14
CA2033232A1 (fr) 1991-07-05
FR2656551A1 (fr) 1991-07-05
NO910020L (no) 1991-07-05
NO910020D0 (no) 1991-01-03

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