EP1634307A2 - Materiau composite pulverulent, magnetique doux, a haute resistance thermo-mecanique - Google Patents

Materiau composite pulverulent, magnetique doux, a haute resistance thermo-mecanique

Info

Publication number
EP1634307A2
EP1634307A2 EP04766042A EP04766042A EP1634307A2 EP 1634307 A2 EP1634307 A2 EP 1634307A2 EP 04766042 A EP04766042 A EP 04766042A EP 04766042 A EP04766042 A EP 04766042A EP 1634307 A2 EP1634307 A2 EP 1634307A2
Authority
EP
European Patent Office
Prior art keywords
composite material
soft magnetic
epoxy resin
iron
magnetic 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Withdrawn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
EP04766042A
Other languages
German (de)
English (en)
Inventor
Wolfgang Von Gentzkow
Jürgen Huber
Gerhard Piecha
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1634307A2 publication Critical patent/EP1634307A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0206—Manufacturing of magnetic cores by mechanical means
    • H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
    • 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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/14708—Fe-Ni based alloys
    • H01F1/14733—Fe-Ni based alloys in the form of particles
    • H01F1/14741—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together
    • H01F1/1475—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated
    • H01F1/14758—Fe-Ni based alloys in the form of particles pressed, sintered or bonded together the particles being insulated by macromolecular organic substances
    • 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
    • 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
    • H01F1/28—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 dispersed or suspended in a bonding agent

Definitions

  • Soft magnetic materials are required in all electrical machines, such as motors and generators, but also in transformers, chokes, transformers, relays, electroacoustic transducers and in many sensors and actuators for guiding the magnetic flux. You determine their shape, component size, performance and efficiency. So far, due to the high magnetic flux densities required, almost exclusively solid iron and iron alloys and - to reduce eddy current losses - packages made of electrically insulated sheets made from these materials have been used. However, the use of sheet metal packages means a not inconsiderable effort, since the sheets have to be painted, punched, compacted and fixed. It reaches its limits when it comes to realizing complex three-dimensional structures.
  • DD 45 170 uses, for example, polyester resin in the liquid state as a binder.
  • the non-tack-free and non-storage stable compound is then processed in a continuous process (e.g. extrusion process).
  • a pressure-atomized pure iron powder is mixed with a cold-curing epoxy resin / hardener mixture that is liquid at room temperature to form a flowable compound, molded, cured at room temperature for 24 hours and post-cured at 80 ° C. for 2 hours. No information is given on the filling levels achieved and the mechanical strengths achieved after hardening.
  • thermoplastic materials such as polyphenyl ether, polyether sulfone, polyether imide or for the production of soft magnetic composite materials
  • WO 99/03622 A1 uses soft-annealed spattery iron powders in combination with a lubricant (wax or polymer).
  • WO 95/29490 A1 describes phenol-formaldehyde resins for binding the spicy iron powder particles.
  • the spattery metal particles are coated with different adhesion promoters or thermoplastics. Compounds produced in this way have the major disadvantage that they are not flowable even under high pressures of 800 MPa and can only be pressed. It is therefore not possible to take geometrically complex structures. After pressing, these have to be worked out mechanically from the pressings using complex machining processes.
  • Another disadvantage is that after the pressing, a complex sintering process must be carried out at 500 ° C., in which the plastic binder is removed. In some cases, temperatures of 700 to 800 ° C. are even given.
  • the composites obtained are known to be very brittle and fragile.
  • the object of the invention is to provide a soft magnetic powder composite material with high thermomechanical strength. This object is achieved by the inventions specified in the independent claims. Advantageous refinements result from the dependent claims.
  • the invention relates to soft magnetic iron powder composites, produced by mixing a predominantly spherical iron powder in a multimodal distribution with a combination of an oxazolidinone-modified epoxy resin and a polyetherimide.
  • Such compounds are free-flowing and therefore very easy to dose. After the reaction resin component has melted, they have a very good flowability despite processing very high filling levels of up to 98% by weight of iron powder and, after hardening, give composite materials with a very high magnetic content
  • One or more oxazolidinone-modified structures having prepolymeric epoxy resin compounds obtained by chemical reaction of commercially available epoxy resins with polyisocyanates.
  • the compounds which can be used according to the invention can be cured anionically or cationically. If amine or phenolic hardeners are added, the hardening is carried out by a polyaddition reaction.
  • the iron powder and the corresponding amount of the combination of oxazolidinone-modified epoxy resin and polyetherimide are used mixed together. This can take place at elevated temperature, that is to say after the epoxy resin, which is solid at room temperature, has been melted without the addition of solvents.
  • the compound is produced particularly advantageously if the combination of oxazolidinone-modified epoxy resin and polyetherimide is dissolved in a very low-boiling solvent, for example dichloromethane, and applied to the iron powder from this solution. If you work with a solution, the solvent is removed again after an intensive mixing process. This can be done, for example, in a ventilated stirred tank, a fluid mixer or with the help of a heated rolling mill.
  • the powdered iron / plastic compound obtained is then further processed in a shaping process. This happens on
  • Example in a pressurizable tool particularly advantageous in a press at elevated temperature.
  • the oxazolidinone-modified epoxy resin passes through a melting phase with low viscosity, which, supported by the spherical particle shape of the iron powder, gives the compound a surprisingly good fluidity for highly filled mixtures.
  • undercuts in the mold can also be perfectly filled with molding compound during the molding process. This is an important prerequisite for the implementation of complex component geometries.
  • the low melt viscosity during the shaping before hardening enables a very good and complete wetting of the iron surface with the reaction resin.
  • oxazolidinone-modified epoxy resins as described in EP 0 828 774 B1, is particularly advantageous. These form one-component compounds which are stable in storage with the iron powders and which can be cured very quickly thermally by polymerization to give the powder composite materials according to the invention. After processing the iron / plastic compounds in the molding process, powder composites with excellent mechanical properties and very good soft magnetic properties are obtained.
  • Example 2 Production and testing of soft magnetic iron / plastic composite materials with different polyetherimide proportions.
  • the dried powder is placed in a mold for the production of a platelike test specimen, which is then first heated in a press without pressure. At 100 ° C, a pressure of approx. 130 MPa is built up over the die of the tool, the mold on. brought a temperature of 170 to 190 ° C and this state maintained for 60 minutes. The test specimen is then removed from the mold and post-cured at 150 ° C. for 4 hours. Bars for the three-point bending test are then sawn out of the test specimen.
  • Table 2 Mechanical property values of iron / plastic composites with different polyetherimide content and flow behavior of the corresponding compounds

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing & Machinery (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Soft Magnetic Materials (AREA)

Abstract

L'invention concerne un matériau composite pulvérulent, magnétique doux, à haute résistance thermo-mécanique, renfermant une poudre magnétique douce, une résine époxyde modifiée à l'oxazolidinone et un polyétherimide.
EP04766042A 2003-06-13 2004-06-09 Materiau composite pulverulent, magnetique doux, a haute resistance thermo-mecanique Withdrawn EP1634307A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10326753 2003-06-13
PCT/EP2004/051075 WO2004112061A2 (fr) 2003-06-13 2004-06-09 Materiau composite pulverulent, magnetique doux, a haute resistance thermo-mecanique

Publications (1)

Publication Number Publication Date
EP1634307A2 true EP1634307A2 (fr) 2006-03-15

Family

ID=33546555

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04766042A Withdrawn EP1634307A2 (fr) 2003-06-13 2004-06-09 Materiau composite pulverulent, magnetique doux, a haute resistance thermo-mecanique

Country Status (2)

Country Link
EP (1) EP1634307A2 (fr)
WO (1) WO2004112061A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006032517B4 (de) * 2006-07-12 2015-12-24 Vaccumschmelze Gmbh & Co. Kg Verfahren zur Herstellung von Pulververbundkernen und Pulververbundkern

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA839459B (en) * 1982-12-30 1985-08-28 Mobil Oil Corp Polyoxazolidone powder coating compositions
DE3920410A1 (de) * 1989-06-22 1991-01-03 Bayer Ag Oligomere epoxidharze auf basis von cyclohexyldiphenolderivaten sowie deren umsetzungsprodukte mit (meth)acrylsaeure und diisocyanaten
JPH06107773A (ja) * 1992-07-17 1994-04-19 Siemens Ag エポキシ樹脂コンパウンドの製造方法
US5314983A (en) * 1992-11-09 1994-05-24 Enichem S.P.A. Process for curing polymerizable liquid compositions based on polyisocyanates and epoxides
JP3228586B2 (ja) * 1993-02-02 2001-11-12 旭電化工業株式会社 乳化性エポキシ樹脂組成物及び硬化性組成物
DE4308184A1 (de) * 1993-03-15 1994-09-22 Siemens Ag Epoxidharzmischungen
WO1996037532A1 (fr) * 1995-05-24 1996-11-28 Siemens Aktiengesellschaft Matieres moulables en resine epoxyde ignifugees sans halogenes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004112061A3 *

Also Published As

Publication number Publication date
WO2004112061A3 (fr) 2005-03-03
WO2004112061A2 (fr) 2004-12-23

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