EP0936638A2 - Procédé de fabrication d un compact ferromagnétique,compact ferromagnétique et son utilisation - Google Patents

Procédé de fabrication d un compact ferromagnétique,compact ferromagnétique et son utilisation Download PDF

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Publication number
EP0936638A2
EP0936638A2 EP99102027A EP99102027A EP0936638A2 EP 0936638 A2 EP0936638 A2 EP 0936638A2 EP 99102027 A EP99102027 A EP 99102027A EP 99102027 A EP99102027 A EP 99102027A EP 0936638 A2 EP0936638 A2 EP 0936638A2
Authority
EP
European Patent Office
Prior art keywords
glass solder
pressing
soft magnetic
powder
glass
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.)
Ceased
Application number
EP99102027A
Other languages
German (de)
English (en)
Other versions
EP0936638A3 (fr
Inventor
Dieter Nützel
Gotthard Dr. Rieger
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP0936638A2 publication Critical patent/EP0936638A2/fr
Publication of EP0936638A3 publication Critical patent/EP0936638A3/fr
Ceased legal-status Critical Current

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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
    • H01F1/147—Alloys characterised by their composition
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15358—Making agglomerates therefrom, e.g. by pressing
    • H01F1/15366—Making agglomerates therefrom, e.g. by pressing using a binder
    • 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
    • H01F1/153—Amorphous metallic alloys, e.g. glassy metals
    • H01F1/15333—Amorphous metallic alloys, e.g. glassy metals containing nanocrystallites, e.g. obtained by annealing
    • 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
    • H01F3/00—Cores, Yokes, or armatures
    • H01F3/08—Cores, Yokes, or armatures made from powder
    • 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

  • the invention relates to a method for producing a ferromagnetic composite compact from a powdery soft magnetic material and from a pressing aid, at a predetermined elevated temperature during pressing is set.
  • the invention further relates to a corresponding one Composite press body and its use.
  • Such ferromagnetic compacts preferably come in HF and NF devices for use, for example in the form of Ring magnetic cores for filter or transmitter devices.
  • they become ferromagnetic Compacts preferably in a hot pressing process manufactured at temperatures of several 100 ° C during of pressing can be set.
  • metallic Powder with flaky powder geometry a relative unfavorable pressing behavior, which is mechanically unstable Compacts with unfavorable dimensional stability and low expresses relative densities.
  • These problems have an effect particularly strong with particle sizes over 200 ⁇ m. This Size range down to 2000 ⁇ m is becoming increasingly interesting, because large metal particles have improved magnetic properties such as lower coercivity and higher permeabilities exhibit.
  • Such particle sizes can, however also in the context of a hot pressing process without pressing aids cannot be processed on an economically reasonable scale.
  • the pressing pressure and / or the pressing temperature must be increased significantly.
  • a complete material bond between the binders in the form of the specified oxides and the metal particles is not achieved.
  • the low density and the lack of dimensional stability have a disadvantageous effect both on the range of use and on the magnetic properties of the compacts obtained.
  • the invention is therefore based on the problem of a method of the type mentioned at the beginning indicating the manufacture ferromagnetic compact with high density and cheap magnetic properties while maintaining compliance portable press parameters enabled.
  • one method is the beginning mentioned type provided according to the invention that as a pressing aid a viscous at the given pressing temperature, hardening glass solder is used when cooling, the powdery soft magnetic material and the glass solder before Pressing can be mixed with one another essentially homogeneously.
  • the invention therefore particularly advantageously provides for the use of a material which is viscous at the pressing temperature.
  • the viscosity of the pressing aid allows the same to flow and to be easily moved and rearranged or aligned of the metal particles. This makes it possible, on the one hand, to produce compacts with a remarkably high density, since, due to the viscosity of the pressing aid, it is possible for the metal particles to accumulate much more densely while at the same time filling any pores with the viscous pressing aid.
  • the metal particles become quasi according to the inventive method melted ", ie, they are completely embedded in the viscous pressing aid, which in turn is cured after cooling to room temperature, so that a much better adhesion can be achieved than with the pressed articles according to the prior art.
  • Glass solders in particular have been found here proven to be particularly suitable, since at the same time they have excellent insulating properties, so that the metal particles can be well insulated from one another, which in particular makes it possible to significantly reduce the magnetic reversal losses which are caused by eddy currents due to inadequate insulation of the metal particles from one another
  • Much more compact and mechanically more stable compact therefore advantageously also has improved magnetic properties.
  • the required pressing pressure can also be handled in manageable areas > in the range between 200 MPa and 800 MPa, in particular between 400 MPa and 500 MPa. Because of the movement and displacement of the metal particles, which show a slight flow at the temperatures mentioned due to their size and structure, pressings with excellent density values, in particular from the preferred pressure range between 400 MPa and 500 MPa, can be obtained.
  • the glass solder with regard to its softening temperature depending on the pressing temperature to get voted. This way you can ensure be that the viscosity of the glass solder is still such it is high that the problems mentioned at the beginning do not occur.
  • the pressing temperature itself is preferably below the crystallization temperature of the amorphous metal powder, so a complete crystallization of the same is avoided and the powder is at most present as a nanocrystalline material.
  • a dependence on the choice of the glass solder is therefore also in Regarding the crystallization temperature of the metallic Powder possible d. that is, the higher the crystallization temperature of the metallic powder, the higher it can be also the pressing temperature and therefore also the softening temperature of the glass solder.
  • a glass solder has proven to be particularly expedient, the softening temperature of which lies in the range between 300 ° C. and 600 ° C., in particular between 400 ° C. and 500 ° C., the pressing temperature in the range between 300 ° C. and 600 ° C., in particular is between 400 ° C and 500 ° C.
  • Such glass solders are used, for example, by Schott Glastechnike Stable glass solders "or Composite glass solders ".
  • the glass solder used according to the invention cures on cooling.
  • the glass solder should be selected according to the invention with regard to its thermal expansion coefficient as a function of the expansion coefficient of the metallic powder.
  • the two expansion coefficients should preferably be as close as possible to one another in order to ensure a uniform cooling behavior.
  • glass solders with an expansion coefficient between 6 and 14 ⁇ 10 -6 K -1 , preferably 8 and 12 ⁇ 10 -6 K -1 are used.
  • the glass solder can be used in an amount of 1-60 % By weight, in particular 5-30% by weight, are added.
  • the amount of pressing aid added can be the density of the Pressed metal particles are set what an influence on the resulting magnetic properties Has. For the extensive isolation of the metal particles from each other higher quantities of pressing aids must be added in order to to reduce eddy current losses. In the opposite direction it decreases due to the lower number of metal particles, the permeability.
  • the amount of pressing aid added depends on according to the desired magnetic properties. It is point out that from the specified quantity ranges any quantity ratio can be chosen, a sufficient stable compact can with all specified amounts are achieved, the main differences are in given the magnetic properties that way can be set arbitrarily.
  • the glass solder has an average grain size between 1 ⁇ m to 15 ⁇ m, especially between 2 ⁇ m and 10 ⁇ m, preferably between 3 ⁇ m and 5 ⁇ m. This ensures that it is safe and uniform between the distributed much larger powder particles, which preferred an average grain size of 50 microns to 2000 microns, in particular from 100 ⁇ m to 1000 ⁇ m, preferably from 300 ⁇ m to 500 ⁇ m. However, if larger powder particles are processed, can also solder glass with larger particles up to 30 ⁇ m be used.
  • the glass solder and the metal powder are mixed together before pressing, until a substantially homogeneous mixture is present, which is preferred
  • a tumble mixer is used is in use a pressing aid with the specified average grain sizes ensures that it is distributed substantially uniformly adheres to the outside of the powder particles and at Soften the powder particles against each other simultaneous formation of a sufficiently thick insulation layer enables.
  • a powder with flake Powder particles are used, which is preferably amorphous or is nanocrystalline.
  • Such flakes have an im essentially flat, plate-like shape. Will these flakes without the use of the pressing aid according to the invention pressed according to methods according to the prior art, store the powder flakes come together completely randomly. The achievable Densities are low, the magnetic properties mostly inferior.
  • the flaky metal particles in which it is preferably metallic glass according to the invention can slide past and slide against each other, because the soldered glass softened the friction of the metal particles reduced among themselves. At the same time there are gaps and pores between the particles are almost completely closed.
  • the metal particles can be preferred align the pressure parallel to each other, which on the one hand to high permeability values and low coercivity with high saturation magnetization leads to others nonetheless adequate insulation of the metal particles against each other with low eddy current losses is achieved.
  • Fe-based ones can preferably be used as metallic glasses or Co-base can be used, in particular those based on Fe-based are advantageous in terms of material costs.
  • the iron atom content of these Fe-based glasses should be according to the invention are more than 70 atomic%.
  • the invention also relates to a ferromagnetic Composite compact formed from a powder a soft magnetic material and a pressing aid.
  • the pressing aid is a glass solder, which is at least essentially homogeneously mixed with the soft magnetic material is.
  • the composite compact according to the invention is preferred manufactured according to the method described above. Further according to the invention Refinements of the composite compact are can be found in the subclaims.
  • the composite compact is preferably part of a soft magnetic Device, in particular in the form of a magnetic core, used.
  • Fig. 1 shows an electron micrograph of a homogeneous Mixture of amorphous metal powder particles with one size from 125 - 150 ⁇ m and 5% by weight glass solder additive. The production was done in a tumble mixer with the addition of several small metal balls (diameter 5 mm) that are even Ensure thorough mixing. 1 shows the glass solder evenly on the surface of the metal particles distributed.
  • the glass solder was in powder form with an average grain size (D 50 value, 50% of the particles are smaller, 50% are larger) of 3.35 ⁇ m.
  • D 50 value 50% of the particles are smaller, 50% are larger
  • a grain size in this area is advantageous in order to ensure an even distribution of the glass solder on the metal particles.
  • FIG. 2 and 3 show microscopic images of two manufactured Compacts.
  • the size of the metal particles used was 200-300 ⁇ m.
  • FIG. 2 shows a view of a compact 3 without a glass solder additive, a compact whose soft magnetic material a composite with a glass solder additive represents 10% by weight of the above-mentioned glass solder G017-340.
  • the compact according to the invention can therefore also be used as be considered a composite molding.
  • the metal particles of the compact shown in FIG. 2 are not aligned and randomly side by side. Between them are considerable Given pores, but also form equally Areas where the metal particles adhere directly to one another.
  • the press body shown has relatively high magnetic losses due to the poor quality insulation of the metal particles against each other, the density is relatively low. This manifests itself in inferior magnetic properties, the permeability is low, the coercivity high.
  • FIG. 4 shows a diagram of the frequency dependence of the permeability of composite compacts according to the invention. Shown is the behavior of three different compacts that vary with the addition of glass solder.
  • a compact contained 5 wt .-% glass solder additive ⁇ the second 10 wt .-%, the third 15% by weight.
  • the particle size of the metal flakes was with these compacts 125-150 ⁇ m.
  • the pressing body with the smallest amount of glass solder is evident the highest permeability.
  • With increasing glass solder content decreases due to the decreasing particle density and the increasing insulation decreases the permeability.
  • Fig. 5 shows a diagram which the losses versus frequency for five different ones Press body with glass solder additives of 5, 10, 20, 30 and 50 wt% shows.
  • the control of the compacts was 0.05 T.
  • the magnetization losses depend on what is getting better and better Insulation.
  • FIG. 6 shows a diagram relating to the coercive field strength in relation to the glass solder additive.
  • the white ones Bars represent the coercive force values for the immediate obtained after pressing, the black Bars the values after heat treatment at 520 ° C, duration 1 hour. This heat treatment is used to remove the powder Converting metal flakes into the nanocrystalline state, whereby higher induction values can be achieved.
  • the coercive field strengths of the nuclei are clearly without Heat treatment all in the range over 80 A / m. After the heat treatment the compacts have a coercive field strength of approx. 40 A / m and below. An influence of the amount of glass solder on the achievable coercive field strength is not clear in this respect.
  • Fig. 7 shows a diagram showing the different material losses in the production of compacts without the addition of glass solder and shows composite compacts with glass solder addition. Metal flakes with a size of 300-500 microns were pressed. Obviously there is a loss of material with the compacts without Glass solder additive in the order of about 1.4%. The opposite show those with the glass solder additive in the amount of 10 wt .-% produced composite molded body no loss of material. This is due to the viscous and subsequent curing glass solder attributed to the metal particles binds tightly together.
  • Fig. 8 shows a diagram regarding the achievable relative density values of compacts without and with Glass solder additive. As can be seen from the diagram, at Compacts without glass solder addition relative density values of approx. 91% can be achieved while using the same processing parameters a 10 wt .-% glass solder addition to a relative Density of 96% leads.
  • composite compacts can be made using the specified method in the form of composite powder cores with clearly improved properties can be produced. They exist preferably made of amorphous and / or nanocrystalline, flake-shaped Material that is preferred for soft magnetic applications intended cores is used. For setting magnetic properties as well as for the degradation of any from the pressing resulting tension can affect the actual Pressing step is a heat treatment step as in FIG. 6 described, connect, in which reinforced a nanocrystalline Phase is formed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Electromagnetism (AREA)
  • Physics & Mathematics (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Soft Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)
  • Hard Magnetic Materials (AREA)
EP99102027A 1998-02-12 1999-02-01 Procédé de fabrication d un compact ferromagnétique,compact ferromagnétique et son utilisation Ceased EP0936638A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19805812 1998-02-12
DE19805812 1998-02-12

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EP0936638A2 true EP0936638A2 (fr) 1999-08-18
EP0936638A3 EP0936638A3 (fr) 1999-12-29

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1083580A2 (fr) * 1999-09-09 2001-03-14 Kubota Corporation Procédé de production d un corps amorphe magnétiquement doux
WO2006042778A1 (fr) * 2004-10-18 2006-04-27 Siemens Aktiengesellschaft Restricteur, destine en particulier a fonctionner dans un systeme convertisseur de frequence, et systeme convertisseur de frequence
EP1826783A1 (fr) * 2006-02-22 2007-08-29 Vacuumschmelze GmbH & Co. KG Procédé de fabrication de noyaux de poudre composites à partir de matériaux magnétiques nanocristallins
CN1771569B (zh) * 2003-02-05 2010-05-26 加拿大易姆芬公司 用于ac应用的高性能磁性复合材料及其生产方法
US8287664B2 (en) 2006-07-12 2012-10-16 Vacuumschmelze Gmbh & Co. Kg Method for the production of magnet cores, magnet core and inductive component with a magnet core
US8298352B2 (en) 2007-07-24 2012-10-30 Vacuumschmelze Gmbh & Co. Kg Method for the production of magnet cores, magnet core and inductive component with a magnet core
US8327524B2 (en) 2000-05-19 2012-12-11 Vacuumscmelze Gmbh & Co. Kg Inductive component and method for the production thereof
US8372218B2 (en) 2006-06-19 2013-02-12 Vacuumschmelze Gmbh & Co. Kg Magnet core and method for its production
US9057115B2 (en) 2007-07-27 2015-06-16 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron-cobalt-based alloy and process for manufacturing it
EP3613872A1 (fr) * 2018-08-21 2020-02-26 Siemens Aktiengesellschaft Procédé de fabrication d'une pièce structurelle pour un composant électrique ou électronique ainsi que pièce structurelle

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518528A1 (fr) * 1981-12-23 1983-06-24 Europ Composants Electron Composition pour la realisation d'une piece magnetique et procede de realisation d'une piece magnetique utilisant cette composition
EP0302355A1 (fr) * 1987-07-23 1989-02-08 Hitachi Metals, Ltd. Poudre magnétique douce en alliage à base de fer, noyau magnétique et méthode de fabrication
EP0376319A2 (fr) * 1988-12-28 1990-07-04 Matsushita Electric Industrial Co., Ltd. Matériau en ferrite composite
US5053283A (en) * 1988-12-23 1991-10-01 Spectrol Electronics Corporation Thick film ink composition
EP0844623A1 (fr) * 1996-11-26 1998-05-27 Kubota Corporation Corps en poudre amorphe magnétiquement doux comprimé et procédé de fabrication

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518528A1 (fr) * 1981-12-23 1983-06-24 Europ Composants Electron Composition pour la realisation d'une piece magnetique et procede de realisation d'une piece magnetique utilisant cette composition
EP0302355A1 (fr) * 1987-07-23 1989-02-08 Hitachi Metals, Ltd. Poudre magnétique douce en alliage à base de fer, noyau magnétique et méthode de fabrication
US5053283A (en) * 1988-12-23 1991-10-01 Spectrol Electronics Corporation Thick film ink composition
EP0376319A2 (fr) * 1988-12-28 1990-07-04 Matsushita Electric Industrial Co., Ltd. Matériau en ferrite composite
EP0844623A1 (fr) * 1996-11-26 1998-05-27 Kubota Corporation Corps en poudre amorphe magnétiquement doux comprimé et procédé de fabrication

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1083580A2 (fr) * 1999-09-09 2001-03-14 Kubota Corporation Procédé de production d un corps amorphe magnétiquement doux
EP1083580A3 (fr) * 1999-09-09 2001-08-01 Kubota Corporation Procédé de production d un corps amorphe magnétiquement doux
US6368423B1 (en) 1999-09-09 2002-04-09 Kubota Corporation Process for producing amorphous magnetically soft body
US8327524B2 (en) 2000-05-19 2012-12-11 Vacuumscmelze Gmbh & Co. Kg Inductive component and method for the production thereof
CN1771569B (zh) * 2003-02-05 2010-05-26 加拿大易姆芬公司 用于ac应用的高性能磁性复合材料及其生产方法
WO2006042778A1 (fr) * 2004-10-18 2006-04-27 Siemens Aktiengesellschaft Restricteur, destine en particulier a fonctionner dans un systeme convertisseur de frequence, et systeme convertisseur de frequence
EP1826783A1 (fr) * 2006-02-22 2007-08-29 Vacuumschmelze GmbH & Co. KG Procédé de fabrication de noyaux de poudre composites à partir de matériaux magnétiques nanocristallins
US8372218B2 (en) 2006-06-19 2013-02-12 Vacuumschmelze Gmbh & Co. Kg Magnet core and method for its production
US8287664B2 (en) 2006-07-12 2012-10-16 Vacuumschmelze Gmbh & Co. Kg Method for the production of magnet cores, magnet core and inductive component with a magnet core
US8298352B2 (en) 2007-07-24 2012-10-30 Vacuumschmelze Gmbh & Co. Kg Method for the production of magnet cores, magnet core and inductive component with a magnet core
US9057115B2 (en) 2007-07-27 2015-06-16 Vacuumschmelze Gmbh & Co. Kg Soft magnetic iron-cobalt-based alloy and process for manufacturing it
EP3613872A1 (fr) * 2018-08-21 2020-02-26 Siemens Aktiengesellschaft Procédé de fabrication d'une pièce structurelle pour un composant électrique ou électronique ainsi que pièce structurelle

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Publication number Publication date
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