EP0663961A1 - Complexe de poudre magnetostrictive et procedes de fabrication - Google Patents

Complexe de poudre magnetostrictive et procedes de fabrication

Info

Publication number
EP0663961A1
EP0663961A1 EP92917301A EP92917301A EP0663961A1 EP 0663961 A1 EP0663961 A1 EP 0663961A1 EP 92917301 A EP92917301 A EP 92917301A EP 92917301 A EP92917301 A EP 92917301A EP 0663961 A1 EP0663961 A1 EP 0663961A1
Authority
EP
European Patent Office
Prior art keywords
composite material
magnetostrictive
material according
grains
powder
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Withdrawn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
EP92917301A
Other languages
German (de)
English (en)
Inventor
Tord Cedell
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.)
FEREDYN EUROPE AB
Original Assignee
FEREDYN EUROPE AB
Proengco AB
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 FEREDYN EUROPE AB, Proengco AB filed Critical FEREDYN EUROPE AB
Publication of EP0663961A1 publication Critical patent/EP0663961A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/58—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres
    • B29C70/62—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising fillers only, e.g. particles, powder, beads, flakes, spheres the filler being oriented during moulding
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/34—Metals, e.g. ferro-silicon
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/36—Inorganic materials not provided for in groups C04B14/022 and C04B14/04 - C04B14/34
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/0094—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with organic materials as the main non-metallic constituent, e.g. resin
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C49/00—Alloys containing metallic or non-metallic fibres or filaments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/0302—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity characterised by unspecified or heterogeneous hardness or specially adapted for magnetic hardness transitions
    • H01F1/0306—Metals or alloys, e.g. LAVES phase alloys of the MgCu2-type
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
    • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
    • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
    • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
    • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
    • H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/22—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/24—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
    • H01F1/26—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N35/00—Magnetostrictive devices
    • H10N35/80—Constructional details
    • H10N35/85—Magnetostrictive active materials
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/004—Shaping under special conditions
    • B29C2791/008—Using vibrations during moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2503/00—Use of resin-bonded materials as filler
    • B29K2503/04—Inorganic materials
    • B29K2503/06—Metal powders, metal carbides or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0003—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular electrical or magnetic properties, e.g. piezoelectric
    • B29K2995/0008—Magnetic or paramagnetic

Definitions

  • the invention relates partly to a magnetostrictive powder composite according to the preamble to claim 1, and partly to a method for the manufacturing of the magneto ⁇ strictive powder composite according to the preamble to claims 16 and 17.
  • the powder composite according to the invention is preferably used as a magnetostrictive element in sound projectors and vibration generators, transducers, actuators and in various types of linear motors.
  • Permanent magnets usually compounds of rare earth metals and transition metals (Fe, Ni, Co) like for instance SmCo 5 and Nd 2 Fe 14 B, are passive devices used for generating a magnetic field. 2. Permanent magnets can only generate static magnetic fields.
  • Permanent magnets are magnetized initially and posses high remanence and high coercive force. Unreasonably high energy would be needed to change the magnetic field, which makes it practically impossible to use permanent magnets for purposes other than to generate static magnetic fields.
  • Permanent magnets do not need an electric current flowing in a coil or a solenoid to generate and maintain the magnetic field.
  • Nd 2 Fe 14 B magnets developed by
  • General Motors are used in the starter motors of their cars and trucks.
  • Magnetostrictive powder composite is an active device consisting of rare earth metals (RE) and transition metals (Fe, Ni, Co and Mn) , (RE) x Fe.,_ x , which changes its length extremely much when exposed to an external magnetic field.
  • a magnetostrictive powder composite displays length changes of more than 1000 ⁇ m/m and is therefore called giant magnetostrictive material. Beacause of this, the magnetostrictive powder composite is used to generate large and fast movements of high precision and large force. In most applications this large force is used to increase change in length and to generate larger movements.
  • Magnetostrictive powder composite is usually used in high frequency applications (up to 60 kHz) , e.g. for ultrasonics.
  • the purpose of the magnetostrictive composite is that it should work as an acoustic projector i.e. to generate fast mechanical movements and ultrasound.
  • Magnetostrictive powder composite is initially a material with low ferromagnetism. Magnetic moments within the magnetic domains in the material are randomly oriented i.e. the material is not magnetized as in the case of the above mentioned permanent magnets. For a powder composite to produce a length change one has to apply mechanical stress on the material to rotate magnetic domains relative the direction of the applied stress, as well as to apply a high magnetic field by feeding current into a coil surrounding the material. Typical magnetic fields are 1 - 8 kOe.
  • the material constituting the magnetostrictive powder composite has low remanence and low coercive force. Chemical composition of the powder is chosen so that the anisotropic energy is minimized. If one omitted to do so it would be very difficult to use the material in practice.
  • Magnetic powder composite has been put forward with a purpose to increase the bandwidth of the casted giant magnetostrictive material available on the market.
  • Magnetostrictive powder composite can manage a frequency region of 0 - 60 kHz, while casted giant magneto ⁇ strictive material only can manage 0 - 2 kHz.
  • Giant magnetostrictive alloys made of terbium, dysprosium and iron are usually called Terfenol-D.
  • Giant magnetostrictive powder composite is used in: A. acoustic underwater sound projectors for high frequencies,
  • Magnetostrictive powder composite according to the invention presented has not been known of before.
  • the patent documents US, A, 4865 660, DK, B, 157 222, FR, A, 2065 359 and EP, Al, 175 535 do certainly refer to magnetic powder composite materials, which nevertheless all are permanet magnets and which find their applications because of their capability to maintain permanent magnetization.
  • Magnetostrictive properties are not mentioned in the above referred documents. The fact that the materials mentioned in these documents include powder grains of rare earth metals and transition metals is of no importance in this context.
  • the magnetostrictive materials are manufactured in the form of rods by casting.
  • the casted rods hereby get brittle characteristics and are beacuse of this very difficult to machine with conventional techniques.
  • Scrap from crashed rods is difficult to reuse.
  • the rods are brittle and can only withstand very small tensional stress.
  • casted magnetostrictive rods like for instance Terfenol-D rods
  • the low permeability of the casted rod also causes magnetization at the rod ends to be lower compared to the rod centre when a conventional coil is used to magnetize the rod. 7. So far it has only been possible to produce magneto ⁇ strictive elements in form of rods with circular cross sections. This causes a large material wastage and a costly machining if another geometrical form is required.
  • the powder composite is so tough that it can be shaped with a conventional cutting technique. 2. Scrap from crushed rods can be ground in an oxygen free atmosphere and thereafter reused for new rods.
  • reinforcement fibres preferably of aluminium oxide, silicon carbide, Kevlar, carbon, glass or titanium, are pressed into the rod and aligned longi- tudinally or perpendicularly, tensile strength and elastic modulus will be increased.
  • the invention utilizes such binding agents which wet said grains and bind them together and possibly also form an electrically conducting layer between the powder grains or between the grain agglomerates. These requirements are fulfilled e.g. by a number of known resins and thermoplastics. Ceramics and oxides, preferably rare earth oxides because of a high reactivity of Terfenol-D, can also be used as an insulating coating.
  • a homogeneous magnetic field generated by permanent magnets can be achieved if a powder of a permanent magnet type, preferably Nd 2 Fe 14 B, is mixed with the magnetostrictive powder, preferably along the rod axis, in order to decrease the leakage flux. This will make it possible to manufacture rods with length/diameter ratios larger than 3:1.
  • high permeability and high resistivity powder grains preferably of coated iron, nickel, cobalt or amorphous iron, like for instance metglas, or alloys of these, can be pressed into the rod ends.
  • Magnetostrictive powder composite can be directly pressed to a final shape, whereby expensive material wastage is avoided.
  • the invention provides for the following advantages: -
  • the surface friction of the magnetostrictive powder composite can be lowered, so that it can glide easier against other objects.
  • its chemical resistance can be increased by coating the magnetostrictive powder composite, after it has been pressed, with a thin layer of non-organic material, such as aluminium oxide or an organic material, such as teflon, or if during pressing the composite surface is provided with a powder coating made of the above mentioned organic or non-organic materials.
  • the strength of the magnetic powder composite can be increased by coating its surfaces, which are in contact with other objects and thereby are exposed to a mechanical load, with a layer made of e.g. aluminium oxide or silicon carbide.
  • additional coil loops and/or coolant channels can be integrated into the pressed form.
  • Fig 1 shows a magnetostrictive composite rod 1 which, besides the magnetostrictive powder, possible coating and a binder, also has permanent magnets 2 of a conventional type at the rod ends and aligned permanent magnet powder 3, mainly along the longitudinal axis of rod 1, which makes the working magnetization in the composite rod 1 more homogeneous.
  • Fig 2 shows a magnetostrictive composite rod 1, an excitation coil for generating magnetizing field 4 and iron powder, coated with a thin electrically insulating layer of Fe 2 0 3 or equivalent material, which has been pressed into the ends 5 of the rod 1. With this design a homogeneous magnetic flux in the composite rod 1 is achieved.
  • Fig 3 shows a magnetostrictive composite rod 1 with longitudinal fibre reinforcement 6 which, ' besides reinforcing the rod 1 and increasing its strength against tensile stress, also makes it possible to build in a prestress into the rod 1.
  • the magnetostrictive composite material according to the invention must exhibit low anisotropic energy and high magnetostriction in order to find practical use. It is therefore important to minimize the anisotropic energy and at the same time to optimize the room temperature magneto ⁇ striction of the composite material.
  • a number of composite materials with chemical composition (RE) X T.,_ X , where RE represents one or a mixture of several rare earth metals, T represents Fe, Ni, Co or Mn or a mixture of two or more of these metals and x assuming a value 0 ⁇ x ⁇ 1 represents atomic fraction, will have the mentioned properties.
  • compositions A) - F) give good such properties in the composite rods: A) Tb x y 1 . x Fe 2 . H wherein x and w represent atomic fractions within 0.2 x ⁇ 1.0 and 0 ⁇ w ⁇ 0.5.
  • the composite material can be further improved if it is exposed to external vibrations during pressing. This will increase the density and the permeability as well as facilitate the magnetic alignement of the magnetostrictive grains.
  • the above described method of manufacture of the magnetostrictive powder composite according to the invention often demands high pressing forces.
  • isostatic pressing is used, which usually means a lower pressing force than in the above described method.
  • the magnetostrictive powder grains and the binder are pressed together isostatically, at which the composite material is directly pressed to an arbitrary final shape.
  • This isostatic pressing can be improved by magnetically aligning the magnetostrictive grains before the composite material has been pressed and before the binder has been cured. This is achieved by applying the magnetizing field along the working direction of the magnetostrictive powder composite.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Power Engineering (AREA)
  • Composite Materials (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Dispersion Chemistry (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Inorganic Chemistry (AREA)
  • Powder Metallurgy (AREA)
  • Hard Magnetic Materials (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

Complexe de poudre magnétostrictive et procédé de fabrication dudit complexe. Le complexe de poudre décrit par l'invention s'utilise, de préférence, en tant qu'élément magnétostrictif dans des projecteurs sonores, des générateurs de vibrations, des transducteurs, des organes de commande et des moteurs linéaires. Le complexe de poudre est constitué par des grains de poudre magnétostrictive, dont la composition chimique est: (RE)xT1-x, où RE représente un métal terreux rare, ou un mélange de plusieurs métaux terreux rares, T représente Fe, Ni, Co ou Mn ou un mélange desdits métaux et x représente une fraction atomique, dont la valeur est située entre 0 et 1 et les grains sont maintenus ensemble au moyen d'un liant. Le complexe de poudre est constitué de façon à présenter un flux magnétique homogène, une bonne résistance et il peut se fabriquer par précompression intégrée. Il peut comporter des canaux réfrigérants et/ou des boucles d'arrêt. On fabrique le complexe de poudre en comprimant les grains de poudre magnétostrictive et le liant, afin de déformer plastiquement les grains, soit complètement soit partiellement, ce qui provoque l'alignement des zones magnétiques des grains perpendiculairement à la pression de compression appliquée. Dans un mode d'exécution alternatif de l'invention, on utilise la compression isostatique.
EP92917301A 1991-05-22 1992-05-19 Complexe de poudre magnetostrictive et procedes de fabrication Withdrawn EP0663961A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9101535 1991-05-22
SE9101535A SE468655B (sv) 1991-05-22 1991-05-22 Magnetostriktiv komposit av pulvermaterial
PCT/SE1992/000331 WO1992020829A1 (fr) 1991-05-22 1992-05-19 Complexe de poudre magnetostrictive et procedes de fabrication

Publications (1)

Publication Number Publication Date
EP0663961A1 true EP0663961A1 (fr) 1995-07-26

Family

ID=20382794

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92917301A Withdrawn EP0663961A1 (fr) 1991-05-22 1992-05-19 Complexe de poudre magnetostrictive et procedes de fabrication

Country Status (6)

Country Link
EP (1) EP0663961A1 (fr)
JP (1) JPH06507676A (fr)
AU (1) AU1870692A (fr)
CA (1) CA2102501A1 (fr)
SE (1) SE468655B (fr)
WO (1) WO1992020829A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI943032A0 (fi) * 1994-06-22 1994-06-22 Valtion Teknillinen Foerfarande foer framstaellning magnetostriktivt material
US5993565A (en) * 1996-07-01 1999-11-30 General Motors Corporation Magnetostrictive composites
AU9570398A (en) * 1997-09-19 1999-04-12 Etrema Products, Inc. Multilayer magnetostrictive transducer and magnetostrictive composite material for same
DE102004034723A1 (de) 2004-07-17 2006-02-09 Carl Freudenberg Kg Magnetostriktives Element und dessen Verwendung
JP6056634B2 (ja) * 2013-04-25 2017-01-11 富士通株式会社 発電装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE757169A (fr) * 1969-10-13 1971-03-16 Western Electric Co Particules ferromagnetiques enrobees de matiere polymere et leur preparation
US4152178A (en) * 1978-01-24 1979-05-01 The United States Of America As Represented By The United States Department Of Energy Sintered rare earth-iron Laves phase magnetostrictive alloy product and preparation thereof
US4644310A (en) * 1984-03-22 1987-02-17 Allied Corporation Actuator system having magnetomechanical cantilever beam formed of ferromagnetic amorphous material
US4865660A (en) * 1985-02-28 1989-09-12 Sumitomo Metal Mining Company Ltd. Rare-earth element/cobalt type magnet powder for resin magnets
US4845450A (en) * 1986-06-02 1989-07-04 Raytheon Company Self-biased modular magnetostrictive driver and transducer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9220829A1 *

Also Published As

Publication number Publication date
CA2102501A1 (fr) 1992-11-23
AU1870692A (en) 1992-12-30
SE9101535D0 (sv) 1991-05-22
WO1992020829A1 (fr) 1992-11-26
JPH06507676A (ja) 1994-09-01
SE9101535L (sv) 1992-11-23
SE468655B (sv) 1993-02-22

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