EP1133577B1 - Method for producing soft-magnetic sintered components - Google Patents
Method for producing soft-magnetic sintered components Download PDFInfo
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- 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
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- binder
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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
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- 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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- Soft Magnetic Materials (AREA)
Description
Die Erfindung betrifft ein Verfahren zur Herstellung von
weichmagnetischen Sinterbauteilen nach dem Oberbegriff des
Anspruchs 1.The invention relates to a process for the preparation of
soft magnetic sintered components according to the preamble of
Weichmagnetische Bauteile erfordern neben den magnetischen Eigenschaften (hohe magnetische Permeabilität und geringe Koerzitivfeldstärke) je nach Anwendungsfall eine komplexe Geometrie. Derartige Bauteile können pulvermetallurgisch hergestellt werden.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.
In der DE 197 45 283 A1 wird bereits ein Verfahren zur Herstellung von Sinterbauteilen, das auch als Warmfließkompaktierverfahren bezeichnet wird, beschrieben. Bei diesem Verfahren werden Ausgangspulver mit einem Binder oder Bindergemisch vermischt und das Gemisch in einem Werkzeug bei erhöhter Temperatur, die über der Erweichungstemperatur des Binders liegt, zu einem Grünkörper verpreßt. Anschließend wird der Grünkörper gesintert. Mit diesem Verfahren lassen sich Bauteile mit komplexer Geometrie herstellen.In DE 197 45 283 A1, a method for Production of sintered components, also known as Warmfließkompaktierverfahren is described. In this process, starting powders with a binder or mixed mixtures and the mixture in one Tool at elevated temperature, above the Softening temperature of the binder is, to a green body pressed. Subsequently, the green body is sintered. With this process makes components more complex Create geometry.
US-A-5 443 787 offenbart ein Verfahren zur Herstellung von weichmagnetischen Sinterbauteilen.US-A-5 443 787 discloses a method of preparation of soft magnetic sintered components.
Das erfindungsgemäße Verfahren mit den kennzeichnenden Merkmalen
des Anspruchs 1 bietet den Vorteil, daß mit geringerem
Verfahrensaufwand eine wesentlich höhere Formkomplexität der
herzustellenden weichmagnetischen Sinterbauteile erreicht
wird, als dies mit dem herkömmlichen axialen Preßverfahren
möglich ist. Ein weiterer Vorteil besteht darin, daß die
Bauteile mit der hohen Formkomplexität keine weitere
mechanische Nachbearbeitbarkeit erfordern. Überdies weisen
die nach dem erfindungsgemäßen Verfahren hergestellten
Bauteile bessere magnetische Eigenschaften auf als Bauteile,
die nach konventionellen Preßverfahren hergestellt werden.
Das erfindungsgemäße Verfahren ermöglicht außerdem im
Vergleich zum Metallpulver-Spritzgußverfahren (MIM-Prozeß)
einen geringeren Feinpulveranteil, wodurch das Verfahren
kostengünstiger wird.The inventive method with the characterizing features
of
Bei dem erfindungsgemäßen Verfahren werden die thermoplastischen Eigenschaften eines temporären Binders, der den Ausgangspulvern zugesetzt wird, ausgenutzt. Dabei wird durch Erwärmung und Erweichung bzw. Verflüssigung des Binders die Fließfähigkeit des Pulverausgangsmaterials soweit verbessert, daß unter Vermeidung von Querfließrissen ein Materialtransport in der in einem Werkzeug ausgebildeten Form für die Bauteile quer zur Preßrichtung erfolgen kann.In the method according to the invention, the 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.
Durch die in den Unteransprüchen aufgeführten Maßnahmen sind vorteilhafte Weiterbildungen und Verbesserungen des erfindungsgemäßen Verfahrens möglich.By the measures listed in the dependent claims are advantageous developments and improvements of inventive method possible.
Durch die Zugabe einer geringen Menge des thermoplastischen Binders wird eine hohe Dichte in einer Pulverpackung realisiert. Außerdem werden dadurch die Eigenschaften des Ausgangspulvergemisches so beeinflußt, daß es das erforderliche Viskositätsverhalten aufweist. Dabei wird der Anteil an Binder so gewählt, daß der aufgebrachte Preßdruck bei Erwärmung und zumindest Erweichung des Binders das Gemisch aus Ausgangspulver und Binder zum Fließen bringen kann, jedoch vermieden wird, daß infolge des Binderanteils, das Eigengewicht des Grünlings, dessen Fließgrenze beim Aufheizen auf Sintertemperatur überschreitet.By adding a small amount of the thermoplastic Binders becomes a high density in a powder pack realized. In addition, 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.
Dem handelsüblichen Standardpulver, das als Ausgangsmaterial verwendet wird, wird ein Anteil an Feinpulver hinzugegeben. Diese Ausgangspulver werden dann mit dem verwendeten Binder vermischt. Dabei kann der Binder als Gemisch aus einem Polymer und Wachs mit dem Gemisch der Ausgangspulver bei einer Temperatur zusammen gemischt werden, bei der das Polymer bereits erweicht und das Wachs geschmolzen ist. Die Verwendung von zwei verschiedenen Polymeren mit unterschiedlichen Viskositätsverhalten ist ebenso denkbar. Dadurch werden die feinen Pulverpartikel durch den Binder an die gröberen Pulverpartikel gebunden und die gröberen Partikel des Pulvers von einer Binderschicht mit feinen Pulverpartikeln umgeben. Das so behandelte Pulver ist gut handhabbar und rieselfähig und liegt als Verbundpulver vor. Dieses Verbundpulver kann auf eine Temperatur vorgewärmt werden, bei der der Binder wieder erweicht und dann in dem beheizbaren Werkzeug, in dem die Form des herzustellenden Bauteiles enthalten ist, eingebracht werden.The standard commercial powder, as the starting material is used, a proportion of fine powder is added. These starting powders are then mixed with the binder used mixed. In this case, 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. As a result, the fine powder particles through the binder to the coarser powder particles bound and the coarser ones Particles of the powder from a binder layer with fine Surrounded by powder particles. 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.
Durch den zugegebenen Anteil an Feinpulvern erhöht sich die Sinteraktivität und demzufolge auch die Sinterdichte der fertig gesinterten weichmagnetischen Sinterbauteile.The added proportion of fine powders increases the Sintering activity and consequently also the sintering density of finished sintered soft magnetic sintered components.
Bei dem vorliegenden erfindungsgemäßen Verfahren wird die Dichtezunahme auf die Formgebung bei der Verdichtung durch Pressen und durch die Schwindung beim Sintern verteilt. Im Gegensatz dazu wird bei den herkömmlichen Preßverfahren das Ausgangspulver erst lose gepackt und die Verdichtung erfolgt hauptsächlich im Formgebungsprozeß beim Pressen. Beim Metallpulver-Spritzgußverfahren wird die Dichtezunahme erst beim Sintern erreicht und die Formgebung läuft nahezu ohne Verdichtung ab.In the present inventive method, the Density increase on shaping during compaction by Pressing and distributed by the shrinkage during sintering. in the In contrast, in the conventional pressing method is the The initial powder is loosely packed and the compaction takes place mainly in the molding process during pressing. At the Metal powder injection molding process, the density increase is only achieved during sintering and the shaping runs almost without Compaction.
Die Erfindung soll nachfolgend anhand von Ausführungsbeispielen näher erläutert werden.The invention will be described below with reference to embodiments be explained in more detail.
Es zeigen:
Figur 1- ein Verfahrensschema zur Herstellung eines weichmagnetischen Sinterbauteils,
Figur 2- Darstellungen von Hystereseschleifen weichmagnetischer Sinterbauteile aus Fe13Cr-, Fe17Co- und Fe48Co2V-Pulver,
Figur 3- Darstellung der ermittelten Magnetisierungskurve eines Fe13Cr-Sinterbauteils und
Figur 4- Darstellung der ermittelten Magnetisierungskurve eines Fe48Co2V-Sinterbauteils.
- FIG. 1
- a process scheme for producing a soft magnetic sintered component,
- FIG. 2
- Illustrations of hysteresis loops of soft-magnetic sintered components made of Fe 13 Cr, Fe 17 Co and Fe 48 Co 2 V powder,
- FIG. 3
- Representation of the determined magnetization curve of a Fe 13 Cr sintered component and
- FIG. 4
- Representation of the determined magnetization curve of a Fe 48 Co 2 V sintered component.
Zur Herstellung eines weichmagnetischen Sinterbauteils werden zunächst gemäß Figur 1 drei Ausgangskomponenten A, B und C eingesetzt. Als Ausgangskomponente A werden 60 bis 93,5 Masse.-% eines Fe13Cr-Standardpulvers mit einer durchschnittlichen Korngröße von 40 bis 150 µm und als Ausgangskomponente B 5 bis 30 Masse.-% eines Fe13Cr-Feinstpulvers mit einer durchschnittlichen Korngröße von 5 bis 40 µm eingesetzt. Als Ausgangskomponente C werden 1,5 bis 4 Masse.-% eines Binders verwendet. Als Binder dient eine Mischung aus 70 % Wachs und 30 Masse.-% Polyethylen (PE).To produce a soft-magnetic sintered component, initially three starting components A, B and C are used according to FIG. As 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. As the 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).
Als zweckmäßig hat sich herausgestellt, als Binder auch ein
Polymer-Polymer-Gemisch mit unterschiedlichen
Viskositätsverhalten der einzelnen Polymere zu verwenden
In einer ersten Verfahrensstufe 1 werden die
Ausgangskomponenten A, B und C in einem heizbaren Knetmischer
zu einer homogenen, fließfähigen Ausgangspulver-Mischung
vermischt. Die erhaltene Mischung wird dann in
einer zweiten Verfahrensstufe 2 unter Verwendung einer
konventionellen Presse mit einem Preßdruck von 400 bis
800 MPa und bei einer Temperatur von 60 bis 100°C zu einem
Grünkörper mit der gewünschten Form gepreßt. Bei dieser
Temperatur wird der Binder zumindest erweicht und das
Ausgangspulvergemisch mit mindesten einem Preßstempel im
Werkzeug verdichtet. Dadurch wird die Ausgangspulver-Mischung
kompaktiert. Wenn die Mischung durch den
Stempeldruck soweit kompaktiert ist, daß der Binder eine
durchgängige Phase bildet, setzt ein viskoses Fließen mit
einer radiale Fließfähigkeit von > 3 mm ein
(Fließkompaktieren). Dieses viskose Fließen sichert, daß
auch Hohlräume im Werkzeug, die quer zur Preßrichtung des
Stempels ausgebildet sind, mit der Ausgangspulver-Binder-Mischung
gefüllt werden. So können auch Hinterschneidungen
mit ausreichender Dichte gefüllt werden. Der Grünkörper wird
dann durch Öffnen des Werkzeuges entformt.As appropriate, it has been found, as a binder also a
Polymer-polymer mixture with different
Viscosity behavior of the individual polymers to use
In a
Nachfolgend wird der erhaltene Grünkörper gemäß der weiteren
Verfahrensstufe 3 einer Hochtemperatursinterung bei
Temperaturen von 1.250 °C bis 1.350 °C unter beispielsweise
Schutzgas unterzogen. Beim Sintern verdampft der Binder
restlos.Subsequently, the obtained green body according to the
Das nach dem geschilderten Verfahren hergestellte weichmagnetische
Sinterbauteil aus Fe13Cr, Fe17Co und Fe48Co2V -
Pulver weisen die in den nachfolgenden Tabellen 1 und 2
aufgeführten magnetischen Eigenschaften sowie die in den
Figuren 2, 3 und 4 dargestellten Hystereseschleifen bzw.
Magnetisierungskurven auf.
Die Ergebnisse der Tabelle 1 wurden mit den Ausgangspulvern A und B im oberen Korngrößenbereich erzielt. Dabei wurde als Komponente A ein Ausgangspulver mit einem d50 von 100 µm als Komponente B ein Ausgangspulver mit einem d50 von 35 µm eingesetzt.The results of Table 1 were obtained with the starting powders A and B in the upper particle size range. In this case, 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 as component A.
Bei den Ergebnissen nach Tabelle 2 wurden die gleichen Ausgangskomponenten A und B verwendet, wobei allerdings der mittlere bis untere Korngrößenbereich benutzt wurde. Als Komponente A wurde ein Ausgangspulver mit einem d50 von 70 µm und als Komponente B ein Ausgangspulver mit einem d50 von 10 µm eingesetzt. Mit diesen Korngrößen wurde überraschend eine deutliche Verbesserung der Raumerfüllung aber auch der magnetischen Parameter des hergestellten weichmagnetischen Sinterbauteils festgestellt.In the results according to Table 2, the same starting components A and B were used, although the middle to lower particle size range was used. Component A used was a starting powder with a d 50 of 70 μm and as component B an initial powder with a d 50 of 10 μm. Surprisingly, a significant improvement in the space filling but also in the magnetic parameters of the produced soft-magnetic sintered component was found with these particle sizes.
In Figur 2 sind die Hystereseschleifen der aus den in der Tabelle 1 aufgeführten weichmagnetischen Sinterbauteile aus Fe13Cr-, Fe17Co- und Fe48Co2V-Pulver dargestellt. Die Hysteresekurven zeigen die magnetische Induktion B in Abhängigkeit der magnetischen Feldstärke H. Der Verlauf der Magnetisierungskurven verdeutlicht, daß alle drei Werkstoffe bei einer relativ hohen Permeabilität eine geringe Koerzitivfeldstärke aufweisen.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.
Die Figuren 3 und 4 zeigen die Zustandsgrößen magnetische Polarisation J in Abhängigkeit von der magnetischen Feldstärke H anhand der Magnetisierungskurven für die in Tabelle 2 aufgeführten weichmagnetischen Sinterbauteile aus Fe13Cr- und Fe48Co2V-Pulver. Dabei wurde bei dem Fe13Cr-Sinterbauteil eine Remanenz von 0,487 T und eine Sättigungspolarisation bzw. Sättigungsinduktion von 1,439 T bei einer maximalen Feldstärke von 10,24 kA/m gemessen. Die Werte des Fe48Co2V-Sinterbauteils weisen eine Remanenz von 1,072 T und eine Sättigungspolarisation bzw. Sättigungsinduktion von 1,89 T bei einer maximalen Feldstärke von 10,31 kA/m auf.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. In the case of 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.
Claims (9)
- Process for producing soft-magnetic sintered components, in which a thermoplastic binder is added to a powder mixture and the shape of a powder preform is produced by pressing, and the powder preform is then sintered, characterized in that an Fe13Cr, Fe17Co or Fe48Co2V powder or a mixture of these powders is used as starting material for the powder mixture, in that the powder mixture has a fine-powder content of 5 to 30% by mass, based on the total starting materials with a mean grain size of 5 to 40 µm, and in that the mixture is pressed to form the powder preform at a temperature which is higher than the softening point of the thermoplastic binder.
- Process according to Claim 1, characterized in that the binder is added to the powder mixture in an amount of from 1.5 to 4% by mass.
- Process according to Claim 1, characterized in that an Fe13Cr, Fe17Co or Fe48Co2V powder of a mixture of these powders is used as staring materials of the powder mixture.
- Process according to Claims 1 to 5, characterized in that the powder mixture and the binder are mixed at elevated temperature, at which the binder softens and/or melts.
- Process according to Claim 1, characterized in that a pressure of from 400 to 800 Mpa is used to press the powder preform.
- Process according to Claim 1, characterized in that the pressing of the powder preform takes place at a temperature of 60 to 100°C.
- Process according to Claim 1, characterized in that a polymer-wax mixture is used as binder.
- Process according to Claim 7, characterized in that the amount of wax is greater than the amount of polymer.
- Process according to Claim 1, characterized in that a polymer-polymer mixture with different viscosities of the individual polymers is used as binder.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19852699 | 1998-11-16 | ||
| DE19852699 | 1998-11-16 | ||
| DE19951963A DE19951963A1 (en) | 1998-11-16 | 1999-10-28 | Sintered soft magnetic components are produced by pressing a standard powder, fine powder and thermoplastic binder mixture at above the binder softening temperature |
| DE19951963 | 1999-10-28 | ||
| PCT/DE1999/003588 WO2000029631A1 (en) | 1998-11-16 | 1999-11-11 | Method for producing soft-magnetic sintered components |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1133577A1 EP1133577A1 (en) | 2001-09-19 |
| EP1133577B1 true EP1133577B1 (en) | 2003-03-05 |
Family
ID=26050175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP99960891A Expired - Lifetime EP1133577B1 (en) | 1998-11-16 | 1999-11-11 | Method for producing soft-magnetic sintered components |
Country Status (6)
| Country | Link |
|---|---|
| EP (1) | EP1133577B1 (en) |
| JP (1) | JP2002530522A (en) |
| CN (1) | CN1123645C (en) |
| CZ (1) | CZ300322B6 (en) |
| ES (1) | ES2194538T3 (en) |
| WO (1) | WO2000029631A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4614908B2 (en) * | 2005-05-11 | 2011-01-19 | 日立粉末冶金株式会社 | Cold cathode fluorescent lamp electrode |
| US20180236537A1 (en) * | 2015-02-09 | 2018-08-23 | Jfe Steel Corporation | Raw material powder for soft magnetic powder, and soft magnetic powder for dust core |
| JP7217856B2 (en) * | 2017-10-31 | 2023-02-06 | 株式会社レゾナック | Manufacturing method of sintered magnetic core, green compact, and sintered magnetic core |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3135661A1 (en) * | 1981-09-09 | 1983-03-17 | Sumitomo Special Metals Co., Ltd., Osaka | Sintered magnetic alloy of the Fe-Cr-Co type and process for producing articles with such an alloy |
| FR2655355B1 (en) * | 1989-12-01 | 1993-06-18 | Aimants Ugimag Sa | ALLOY FOR PERMANENT MAGNET TYPE FE ND B, SINTERED PERMANENT MAGNET AND PROCESS FOR OBTAINING SAME. |
| US5368630A (en) * | 1993-04-13 | 1994-11-29 | Hoeganaes Corporation | Metal powder compositions containing binding agents for elevated temperature compaction |
| JP3400027B2 (en) * | 1993-07-13 | 2003-04-28 | ティーディーケイ株式会社 | Method for producing iron-based soft magnetic sintered body and iron-based soft magnetic sintered body obtained by the method |
| DE19745283C2 (en) * | 1997-10-15 | 2000-02-24 | Fraunhofer Ges Forschung | Process for manufacturing components from powder |
-
1999
- 1999-11-11 JP JP2000582609A patent/JP2002530522A/en active Pending
- 1999-11-11 EP EP99960891A patent/EP1133577B1/en not_active Expired - Lifetime
- 1999-11-11 CN CN99813335.3A patent/CN1123645C/en not_active Expired - Lifetime
- 1999-11-11 WO PCT/DE1999/003588 patent/WO2000029631A1/en active IP Right Grant
- 1999-11-11 ES ES99960891T patent/ES2194538T3/en not_active Expired - Lifetime
- 1999-11-11 CZ CZ20011699A patent/CZ300322B6/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CZ300322B6 (en) | 2009-04-22 |
| CN1326517A (en) | 2001-12-12 |
| EP1133577A1 (en) | 2001-09-19 |
| CN1123645C (en) | 2003-10-08 |
| WO2000029631A1 (en) | 2000-05-25 |
| ES2194538T3 (en) | 2003-11-16 |
| CZ20011699A3 (en) | 2002-10-16 |
| JP2002530522A (en) | 2002-09-17 |
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