EP1133577B1 - Verfahren zur herstellung von weichmagnetischen sinterbauteilen - Google Patents

Verfahren zur herstellung von weichmagnetischen sinterbauteilen Download PDF

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Publication number
EP1133577B1
EP1133577B1 EP99960891A EP99960891A EP1133577B1 EP 1133577 B1 EP1133577 B1 EP 1133577B1 EP 99960891 A EP99960891 A EP 99960891A EP 99960891 A EP99960891 A EP 99960891A EP 1133577 B1 EP1133577 B1 EP 1133577B1
Authority
EP
European Patent Office
Prior art keywords
powder
mixture
binder
process according
polymer
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.)
Expired - Lifetime
Application number
EP99960891A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1133577A1 (de
Inventor
Rudolf Schneider
Georg Veltl
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.)
Sinterwerke Herne GmbH
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
Original Assignee
BT Magnet Technologie GmbH
Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
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
Priority claimed from DE19951963A external-priority patent/DE19951963A1/de
Application filed by BT Magnet Technologie GmbH, Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV filed Critical BT Magnet Technologie GmbH
Publication of EP1133577A1 publication Critical patent/EP1133577A1/de
Application granted granted Critical
Publication of EP1133577B1 publication Critical patent/EP1133577B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H01F1/20—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

Definitions

  • the invention relates to a process for the preparation of soft magnetic sintered components according to the preamble of Claim 1.
  • Soft magnetic components require in addition to the magnetic Properties (high magnetic permeability and low Coercive force), depending on the application, a complex Geometry. Such components can be powder metallurgical getting produced.
  • US-A-5 443 787 discloses a method of preparation of soft magnetic sintered components.
  • the inventive method with the characterizing features of claim 1 offers the advantage that with less Process complexity a much higher shape complexity of reached to be produced soft magnetic sintered components is, than with the conventional axial pressing method is possible. Another advantage is that the Components with the high shape complexity no further require mechanical reworkability. Moreover, show produced by the process according to the invention Components have better magnetic properties than components, which are produced by conventional pressing. The inventive method also allows in Comparison to the metal powder injection molding process (MIM process) a lower proportion of fine powder, whereby the process becomes cheaper.
  • MIM process metal powder injection molding process
  • thermoplastic properties of a temporary binder which is added to the starting powders, exploited. there is caused by heating and softening or liquefaction of the Binders the flowability of the powder starting material improved so far that while avoiding cross-flow cracks a material transport in the trained in a tool Shape can be made for the components transverse to the pressing direction.
  • thermoplastic Binders By adding a small amount of the thermoplastic Binders becomes a high density in a powder pack realized.
  • the properties of the Starting powder mixture so affected that it having required viscosity behavior. It is the Proportion of binder chosen so that the applied pressure when heated and at least softening of the binder the Allow mixture of starting powder and binder to flow can, but it is avoided that due to the binder content, the weight of the green compact, whose yield point at Heating up to sintering temperature exceeds.
  • the binder as a mixture of a Polymer and wax with the mixture of the starting powder at be mixed together at a temperature at which the Polymer already softened and the wax has melted.
  • the Use of two different polymers with different viscosity behavior is also conceivable.
  • the powder thus treated is good manageable and pourable and is available as a composite powder.
  • This composite powder can be preheated to a temperature where the binder softens again and then in the Heatable tool in which the shape of the produced Components is included, are introduced.
  • the added proportion of fine powders increases the Sintering activity and consequently also the sintering density of finished sintered soft magnetic sintered components.
  • the conventional pressing method is the The initial powder is loosely packed and the compaction takes place mainly in the molding process during pressing.
  • the density increase is only achieved during sintering and the shaping runs almost without Compaction.
  • starting component A are 60 to 93.5 mass .-% of Fe 13 Cr standard powder having an average particle size of 40 to 150 microns and as starting component B 5 to 30 mass .-% of Fe 13 Cr ultrafine powder having an average particle size of 5 to 40 microns used.
  • starting component C 1.5 to 4% by weight of a binder is used.
  • the binder used is a mixture of 70% wax and 30% by weight of polyethylene (PE).
  • a binder also a Polymer-polymer mixture with different Viscosity behavior of the individual polymers to use
  • a first process stage 1 the Starting components A, B and C in a heatable kneading mixer to a homogeneous, flowable starting powder mixture mixed.
  • the resulting mixture is then poured into a second process stage 2 using a conventional press with a pressure of 400 to 800 MPa and at a temperature of 60 to 100 ° C to one Green body pressed with the desired shape.
  • a conventional press with a pressure of 400 to 800 MPa and at a temperature of 60 to 100 ° C to one Green body pressed with the desired shape.
  • a second process stage 2 using a conventional press with a pressure of 400 to 800 MPa and at a temperature of 60 to 100 ° C to one Green body pressed with the desired shape.
  • the soft magnetic sintered component of Fe 13 Cr, Fe 17 Co and Fe 48 Co 2 V powder produced by the process described has the magnetic properties listed in Tables 1 and 2 below and also the hysteresis loops shown in FIGS. 2, 3 and 4. Magnetization curves on.
  • Table 1 The results of Table 1 were obtained with the starting powders A and B in the upper particle size range.
  • a starting powder with a d 50 of 100 .mu.m was used as component A
  • a starting powder having a d 50 of 35 microns was used as component A.
  • FIG. 2 shows the hysteresis loops of the soft magnetic sintered components of Fe 13 Cr, Fe 17 Co and Fe 48 Co 2 V powders listed in Table 1.
  • the hysteresis curves show the magnetic induction B as a function of the magnetic field strength H. The course of the magnetization curves makes it clear that all three materials have a low coercive force at a relatively high permeability.
  • FIGS. 3 and 4 show the state variables magnetic polarization J as a function of the magnetic field strength H on the basis of the magnetization curves for the soft magnetic sintered components of Fe 13 Cr and Fe 48 Co 2 V powder listed in Table 2.
  • the Fe 13 Cr sintered component a remanence of 0.487 T and a saturation polarization or saturation induction of 1.439 T at a maximum field strength of 10.24 kA / m were measured.
  • the values of the Fe 48 Co 2 V sintered component have a remanence of 1.072 T and a saturation polarization or saturation induction of 1.89 T at a maximum field strength of 10.31 kA / m.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Powder Metallurgy (AREA)
  • Soft Magnetic Materials (AREA)
EP99960891A 1998-11-16 1999-11-11 Verfahren zur herstellung von weichmagnetischen sinterbauteilen Expired - Lifetime EP1133577B1 (de)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19852699 1998-11-16
DE19852699 1998-11-16
DE19951963 1999-10-28
DE19951963A DE19951963A1 (de) 1998-11-16 1999-10-28 Verfahren zur Herstellung von weichmagnetischen Sinterbauteilen
PCT/DE1999/003588 WO2000029631A1 (de) 1998-11-16 1999-11-11 Verfahren zur herstellung von weichmagnetischen sinterbauteilen

Publications (2)

Publication Number Publication Date
EP1133577A1 EP1133577A1 (de) 2001-09-19
EP1133577B1 true EP1133577B1 (de) 2003-03-05

Family

ID=26050175

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99960891A Expired - Lifetime EP1133577B1 (de) 1998-11-16 1999-11-11 Verfahren zur herstellung von weichmagnetischen sinterbauteilen

Country Status (6)

Country Link
EP (1) EP1133577B1 (cs)
JP (1) JP2002530522A (cs)
CN (1) CN1123645C (cs)
CZ (1) CZ300322B6 (cs)
ES (1) ES2194538T3 (cs)
WO (1) WO2000029631A1 (cs)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4614908B2 (ja) * 2005-05-11 2011-01-19 日立粉末冶金株式会社 冷陰極蛍光ランプ用電極
CN107206486B (zh) * 2015-02-09 2021-09-10 杰富意钢铁株式会社 软磁性粉末用原料粉末和压粉磁芯用软磁性粉末
JP7217856B2 (ja) * 2017-10-31 2023-02-06 株式会社レゾナック 焼結磁心の製造方法、圧粉体、及び焼結磁心

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3135661A1 (de) * 1981-09-09 1983-03-17 Sumitomo Special Metals Co., Ltd., Osaka Gesinterte magnetische legierung des fe-cr-co-typs und verfahren zur herstellung von gegenstaenden mit einer solchen legierung
FR2655355B1 (fr) * 1989-12-01 1993-06-18 Aimants Ugimag Sa Alliage pour aimant permanent type fe nd b, aimant permanent fritte et procede d'obtention.
US5368630A (en) * 1993-04-13 1994-11-29 Hoeganaes Corporation Metal powder compositions containing binding agents for elevated temperature compaction
JP3400027B2 (ja) * 1993-07-13 2003-04-28 ティーディーケイ株式会社 鉄系軟磁性焼結体の製造方法およびその方法により得られた鉄系軟磁性焼結体
DE19745283C2 (de) * 1997-10-15 2000-02-24 Fraunhofer Ges Forschung Verfahren zur Herstellung von Bauteilen aus Pulvern

Also Published As

Publication number Publication date
EP1133577A1 (de) 2001-09-19
JP2002530522A (ja) 2002-09-17
CN1123645C (zh) 2003-10-08
CN1326517A (zh) 2001-12-12
CZ20011699A3 (cs) 2002-10-16
ES2194538T3 (es) 2003-11-16
WO2000029631A1 (de) 2000-05-25
CZ300322B6 (cs) 2009-04-22

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