EP1166290A1 - Materiau composite fritte magnetique doux et son procede de production - Google Patents

Materiau composite fritte magnetique doux et son procede de production

Info

Publication number
EP1166290A1
EP1166290A1 EP00987036A EP00987036A EP1166290A1 EP 1166290 A1 EP1166290 A1 EP 1166290A1 EP 00987036 A EP00987036 A EP 00987036A EP 00987036 A EP00987036 A EP 00987036A EP 1166290 A1 EP1166290 A1 EP 1166290A1
Authority
EP
European Patent Office
Prior art keywords
starting
composite material
powder
component
mixture
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Withdrawn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
EP00987036A
Other languages
German (de)
English (en)
Inventor
Waldemar Draxler
Thomas Christmann
Horst Boeder
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1166290A1 publication Critical patent/EP1166290A1/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Withdrawn legal-status Critical Current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
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
    • 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
    • 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
    • H01F1/33—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 mixtures of metallic and non-metallic particles; metallic particles having oxide skin

Definitions

  • the invention relates to a sintered soft magnetic composite material, in particular for use in solenoid valves, and a method for producing such a composite material according to the type of the independent claims.
  • Known fast-switching magnetic injection valves are made from soft magnetic materials such as FeCr or FeCo alloys or from powder composite materials with the highest possible specific electrical resistance.
  • the sintered soft magnetic composite material according to the invention and the method for its production have the advantage over the prior art that specific electrical resistances of more than 2 ⁇ m can be achieved. Furthermore, the composite material according to the invention is very temperature-resistant and at the same time also fuel-resistant. In addition, it can be machined at least to a limited extent.
  • the composite material according to the invention further achieves a saturation polarization of approximately 1.6 Tesla, which is comparable to known materials made of iron powder and organic binder.
  • a large number of known soft or hard magnetic ferrite powders are also suitable for the second, ferrimagnetic starting component.
  • the use of oxidic powders such as Fe 2 0 3 is particularly advantageous.
  • known strontium or barium hard ferrites or known soft ferrites such as MnZn or NiZn.
  • the average grain size the powder particles of the ferromagnetic starting component is significantly larger than the average grain size of the powder particles of the ferrite powder.
  • silicon or silicon dioxide can advantageously be used to increase the specific electrical resistance and the permeability of the composite material.
  • Aluminum or aluminum oxide is suitable, for example, for increasing the specific electrical resistance.
  • the pressing aid which is more preferably added to the starting mixture, facilitates the compression and shaping of the starting mixture in a die. It is advantageous that this pressing aid is completely removed or evaporated again during debinding, so that it has no direct influence on the achievable material characteristics of the sintered soft magnetic composite material obtained.
  • the invention is explained in more detail with reference to the drawing and in the description below.
  • the figure shows a basic sketch of an initial mixture.
  • a sintered soft magnetic composite material by combining a powdery, ferromagnetic first starting component 11 with a ferrite powder as the ferritic second starting component 12, the ferrite powder being present at least largely as a grain boundary phase in the composite material after sintering.
  • the first starting component 11 pure iron powder or a powder alloyed with 0.1 to 1% by weight phosphorus (phosphated iron powder) is specified as the main constituent.
  • This powder has a grain size distribution of 60 ⁇ m to 200 ⁇ m.
  • a ferrite powder in the form of a powder with a very fine grain size is then added to this ferromagnetic starting component 11 as the second starting component 12.
  • a suitable ferrite powder is, for example, a powdery soft ferrite such as MnZn or NiZn ferrite, a powdery hard ferrite such as strontium ferrite (6Fe 2 0 3 : SrO) or barium ferrite (6Fe 2 0 3 : BaO), or iron oxide powder
  • the average particle size of the powder particles of the second starting component 12 is preferably less than 20 ⁇ m.
  • the respective weight ratios between the ferromagnetic first output component 11 and the added second output component 12 result in the individual case from the required magnetic properties of the composite material to be produced and the desired specific electrical resistance.
  • the proportion of the ferromagnetic starting component 11 as the main constituent is between 88 and 98% by weight and the proportion of the second starting component 12 is between 2 and 12% by weight.
  • further additives can be added to achieve or fine-tune the magnetic or electrical properties of the composite material to be produced.
  • silicon and / or aluminum and their oxides are particularly suitable, both of which are added as powders with a preferred grain size of less than 50 ⁇ m.
  • Micro wax is also expediently added to the starting mixture as a pressing aid.
  • the achievable specific electrical resistance of the sintered composite material finally obtained is determined primarily by the amount of the ferrite powder added.
  • composition of the starting mixture can be varied within the following limits:
  • the materials mentioned in the starting mixture are then first mixed with one another, the mixing time depending on the composition being between 30 minutes and 240 minutes.
  • the starting mixture is then shaped and compressed by uniaxial pressing in a die, so that a green body is formed.
  • the pressure during uniaxial pressing is preferably 500 MPa to 750 MPa.
  • the green bodies obtained are first debindered in a nitrogen atmosphere at a temperature between 450 ° C. and 500 ° C. over a period of 30 minutes to 45 minutes before sintering.
  • the micro wax added as a pressing aid is removed again by essentially evaporating it.
  • This debinding is followed by a two-stage sintering process.
  • the first stage of the sintering process at a temperature between 500 ° C. and 700 ° C. for a period of 30 minutes to 12 hours in a gas atmosphere with the composition 50% by volume to 100% by volume nitrogen and 0% by volume to 50 vol. % Oxygen sintered.
  • the gas atmosphere preferably contains 5 vol. % to 30 vol.% oxygen.
  • This first stage of the sintering process is followed by a second stage at temperatures between 900 ° C and 1150 ° C.
  • This second sintering stage extends over a period of 5 minutes to 2 hours, with the heating rate between 10 to 40 K / min and the cooling rate between 5 to 40 K / min is selected.
  • the sintering is carried out in a gas atmosphere which initially consists of 50 vol. % up to 100 vol.% embroidery Fabric and 0 vol. % to 50 vol.% oxygen.
  • the gas atmosphere preferably contains 5 vol.
  • % up to 30 vol. % Oxygen At the beginning of the second stage of the sintering process.
  • the oxygen content of the gas atmosphere is then gradually or continuously reduced.
  • the oxygen content can be reduced to up to 0% by volume, ie the gas atmosphere at the end of the second sintering stage can consist only of nitrogen. In this case, too, another inert gas can be used instead of nitrogen.
  • a thermal aftertreatment of the soft magnetic composite material is then carried out, if necessary, which extends over a period of 30 minutes to 3 hours.
  • the sintered body is subjected to a gas atmosphere at temperatures of 600 ° C to 800 ° C, 50% by volume to 100% by volume.
  • % of nitrogen and 0 vol. % up to 50 vol. % consists of oxygen.
  • the gas atmosphere preferably has an oxygen content of 10 to 30% by volume during the thermal aftertreatment.
  • This thermal aftertreatment serves to improve the physical properties of the sintered composite body obtained and, depending on the qualitative requirements for the composite material and the starting components used, can therefore also be omitted in order to save costs.
  • the debinding of the compressed starting mixture and the sintering of the compressed, debindered starting mixture to form the composite material can take place in succession in one work step. After completion of the sintering, the soft magnetic composite material obtained can then, if necessary, be reworked mechanically.
  • the composite material finally obtained has a typical saturation polarization of approximately 1 Tesla to 1.6 Tesla, in particular more than 1.5 Tesla, with a specific electrical resistance of more than 2 ⁇ m. It is also fully fuel and temperature resistant for use in solenoid valves under typical conditions.
  • a further exemplary embodiment of the invention provides, in a slight modification of the above exemplary embodiment, to first mix the first ferromagnetic starting component 11 and the second starting component 12 in the form of a ferrite powder, optionally with the addition of silicon, aluminum or their oxides, and this mixture then first, ie to undergo heat treatment before pressing or compacting.
  • This heat treatment is carried out at 400 ° C to 700 ° C for 15 min to 45 min under a gas atmosphere of the composition 50 vol.% To 100 vol. % Nitrogen and 0 vol. % to 50 vol.% oxygen.
  • the gas atmosphere preferably has a proportion of 10% by volume to 30% by volume of oxygen.
  • Another inert gas is also suitable instead of nitrogen.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Soft Magnetic Materials (AREA)
  • Powder Metallurgy (AREA)

Abstract

L'invention concerne un matériau composite fritté magnétique doux, destiné en particulier à être utilisé dans des électrovannes, ainsi qu'un procédé permettant de produire un tel matériau composite. Selon l'invention, on constitue d'abord un mélange de départ à partir duquel le matériau composite magnétique doux se forme après le frittage, comprenant un premier composant de départ (11), ferromagnétique, en particulier pulvérulent, en tant que composant principal, et un second composant de départ (2) ferritique, en tant que composant secondaire, et, éventuellement, un agent auxiliaire de pressage. Après le frittage du mélange de départ, le second composant de départ (12) est présent dans le matériau composite produit au moins dans une large mesure sous la forme d'une phase intergranulaire. Le procédé de production selon l'invention comprend les étapes suivantes: préparation du mélange de départ, réalisation du mélange de départ, compression du mélange de départ dans une matrice sous haute pression, élimination du liant du mélange de départ comprimé, et frittage du mélange de départ comprimé, pour former le matériau composite.
EP00987036A 1999-12-14 2000-10-26 Materiau composite fritte magnetique doux et son procede de production Withdrawn EP1166290A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19960095 1999-12-14
DE19960095A DE19960095A1 (de) 1999-12-14 1999-12-14 Gesinterter weichmagnetischer Verbundwerkstoff und Verfahren zu dessen Herstellung
PCT/DE2000/003801 WO2001045116A1 (fr) 1999-12-14 2000-10-26 Materiau composite fritte magnetique doux et son procede de production

Publications (1)

Publication Number Publication Date
EP1166290A1 true EP1166290A1 (fr) 2002-01-02

Family

ID=7932501

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00987036A Withdrawn EP1166290A1 (fr) 1999-12-14 2000-10-26 Materiau composite fritte magnetique doux et son procede de production

Country Status (6)

Country Link
US (1) US6726740B1 (fr)
EP (1) EP1166290A1 (fr)
JP (1) JP2003517195A (fr)
KR (1) KR20020005586A (fr)
DE (1) DE19960095A1 (fr)
WO (1) WO2001045116A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002081129A1 (fr) * 2001-04-02 2002-10-17 Mitsubishi Materials Corporation Materiau fritte magnetique doux composite ayant une densite elevee et une permeabilite magnetique elevee, et procede permettant sa preparation
DE10225154B4 (de) * 2002-06-06 2012-06-06 Robert Bosch Gmbh Weichmagnetischer Pulververbundwerkstoff, Verfahren zu dessen Herstellung und dessen Verwendung
JP4265358B2 (ja) * 2003-10-03 2009-05-20 パナソニック株式会社 複合焼結磁性材の製造方法
JP4534523B2 (ja) * 2004-02-25 2010-09-01 パナソニック株式会社 複合焼結磁性材料の製造方法
US20070036669A1 (en) * 2004-09-03 2007-02-15 Haruhisa Toyoda Soft magnetic material and method for producing the same
KR100897160B1 (ko) * 2007-06-22 2009-05-14 주식회사 대우일렉트로닉스 모터의 로터, 이의 제조장치 및 제조방법
KR100898489B1 (ko) * 2007-06-22 2009-05-19 주식회사 대우일렉트로닉스 모터의 스테이터, 이의 제조장치 및 제조방법
JPWO2010084812A1 (ja) * 2009-01-22 2012-07-19 住友電気工業株式会社 冶金用粉末の製造方法、圧粉磁心の製造方法、圧粉磁心およびコイル部品
TWI407462B (zh) * 2009-05-15 2013-09-01 Cyntec Co Ltd 電感器及其製作方法
DE102011101264B4 (de) * 2011-05-11 2022-05-19 Air Liquide Deutschland Gmbh Verfahren zur Wärmebehandlung von gepressten Formteilen
JP6115057B2 (ja) * 2012-09-18 2017-04-19 Tdk株式会社 コイル部品
CZ304949B6 (cs) * 2013-12-18 2015-02-04 Vysoké Učení Technické V Brně Magnetoreologický ventil
JP6777041B2 (ja) 2017-08-02 2020-10-28 株式会社デンソー 圧粉磁心用粉末および圧粉磁心

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Also Published As

Publication number Publication date
US6726740B1 (en) 2004-04-27
WO2001045116A1 (fr) 2001-06-21
DE19960095A1 (de) 2001-07-05
JP2003517195A (ja) 2003-05-20
KR20020005586A (ko) 2002-01-17

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