EP1634306A2 - Materiau composite pulverulent, magnetique doux, a haute resistance mecanique - Google Patents

Materiau composite pulverulent, magnetique doux, a haute resistance mecanique

Info

Publication number
EP1634306A2
EP1634306A2 EP04741767A EP04741767A EP1634306A2 EP 1634306 A2 EP1634306 A2 EP 1634306A2 EP 04741767 A EP04741767 A EP 04741767A EP 04741767 A EP04741767 A EP 04741767A EP 1634306 A2 EP1634306 A2 EP 1634306A2
Authority
EP
European Patent Office
Prior art keywords
composite material
soft magnetic
epoxy resin
oxazolidinone
iron
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Withdrawn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
EP04741767A
Other languages
German (de)
English (en)
Inventor
Wolfgang Von Gentzkow
Peter Donner
Jürgen Huber
Gerhard Piecha
Michael Schreyer
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 EP1634306A2 publication Critical patent/EP1634306A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • 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
    • 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

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 (eg 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.
  • DE 2 147 663 describes a similar process with heat-curing epoxy resins of thermal class F.
  • the epoxy resin mixture used for this which is obviously solid at room temperature, is applied to the iron powder via a solution. The curing takes place at 160 ° C.
  • a comparatively low mechanical strength of 85 MPa is described with a degree of filling of 83% by weight.
  • SU 1080220 A describes phenol / formaldehyde resins as binders for the iron powder.
  • the specified test specimens with densities between 6.8 g / cm ⁇ and 7.0 cm ⁇ achieve a maximum strength of 75 MPa.
  • 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 mechanical 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 an oxazolidinone-modified epoxy resin. Such compounds are free-flowing and therefore very easy to dose. They point after the melting of the
  • Reaction resin component despite very high filling levels of up to 98% by weight of iron powder have a very good flowability during processing and, after hardening, give composite materials with a very high magnetic permeability and a very high mechanical strength.
  • connection structures with high structures are found between the oxazolidinone structures and the surface of the iron powder Form binding energy that brings about the high mechanical strength of the composite material.
  • 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 oxazolidinone-modified epoxy resin are mixed together. This can be done 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 oxazolidinone-modified epoxy resin is dissolved in a very low-boiling solvent, for example dichloromethane, and is 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 is done, for example, in a pressurizable tool, particularly advantageously in a press, at an 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 press 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.
  • powder composites After processing the iron / plastic compounds in the molding process, powder composites are used excellent mechanical property level and very good ⁇ soft magnetic properties.
  • the dried powder is placed in a mold for producing a plate-shaped 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 is brought to a temperature of 170 to 190 ° C and this state is maintained for 60 minutes. The test specimen is then removed from the mold and can be post-hardened if necessary at temperatures ⁇ 150 ° C. 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 various thermoset matrix systems 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)
  • Soft Magnetic Materials (AREA)
  • Epoxy Resins (AREA)

Abstract

L'invention concerne un matériau composite pulvérulent, magnétique doux, à haute résistance mécanique, renfermant une poudre magnétique douce et une résine époxyde modifiée à l'oxazolidinone.
EP04741767A 2003-06-13 2004-06-09 Materiau composite pulverulent, magnetique doux, a haute resistance mecanique Withdrawn EP1634306A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10326752 2003-06-13
PCT/EP2004/051074 WO2004112062A2 (fr) 2003-06-13 2004-06-09 Materiau composite pulverulent, magnetique doux, a haute resistance mecanique

Publications (1)

Publication Number Publication Date
EP1634306A2 true EP1634306A2 (fr) 2006-03-15

Family

ID=33546554

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04741767A Withdrawn EP1634306A2 (fr) 2003-06-13 2004-06-09 Materiau composite pulverulent, magnetique doux, a haute resistance mecanique

Country Status (2)

Country Link
EP (1) EP1634306A2 (fr)
WO (1) WO2004112062A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013218829A1 (de) 2013-09-19 2015-03-19 Siemens Aktiengesellschaft Rotor für eine elektrische Maschine, Verfahren zum Herstellen eines Rotors sowie elektrische Maschine

Family Cites Families (5)

* 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
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
JPH11508287A (ja) * 1995-05-24 1999-07-21 シーメンス アクチエンゲゼルシヤフト ハロゲン不含の防炎剤を含むエポキシ樹脂成形コンパウンド

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2004112062A3 *

Also Published As

Publication number Publication date
WO2004112062A3 (fr) 2005-03-03
WO2004112062A2 (fr) 2004-12-23

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