WO2005035171A1 - Method of producing a soft magnetic composite component with high resistivity - Google Patents
Method of producing a soft magnetic composite component with high resistivity Download PDFInfo
- Publication number
- WO2005035171A1 WO2005035171A1 PCT/SE2003/001579 SE0301579W WO2005035171A1 WO 2005035171 A1 WO2005035171 A1 WO 2005035171A1 SE 0301579 W SE0301579 W SE 0301579W WO 2005035171 A1 WO2005035171 A1 WO 2005035171A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- soft magnetic
- iron
- magnetic composite
- resistivity
- powder
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0094—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with organic materials as the main non-metallic constituent, e.g. resin
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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
- 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
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/28—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder dispersed or suspended in a bonding agent
Definitions
- the present invention relates to a method of improving the resistivity of a soft magnetic composite component. More specifically, the invention concerns a method of improving the resistivity of a moulded, heat treated component made of a mixture of an iron-based powder and an organic resin.
- Soft magnetic materials are used for applications, such as core materials in inductors, stators and rotors for electrical machines, actuators, sensors and transformer cores.
- soft magnetic cores such as rotors and stators in electric machines, are made of stacked steel laminates.
- Soft Magnetic Composite, SMC materials are based on soft magnetic particles, usually iron-based, with an electrically insulating coating on each particle.
- SMC parts are obtained.
- This powder metallurgical technique it is possible to produce materials having a higher degree of freedom in the design of the SMC component than by using the steel laminates, as the SMC material can carry a three dimensional magnetic flux and as three dimensional shapes can be obtained by the compaction process.
- Two key characteristics of an iron core component are its magnetic permeability and core loss characteristics.
- the magnetic permeability of a material is an indication of its ability to become magnetised or its ability to carry a magnetic flux. Permeability is defined as the ratio of the induced magnetic flux to the magnetising force or field intensity.
- the desired powder properties include suitability for compression moulding techniques, which i.e. means that the powder can be easily moulded to a high density component, which can be easily ejected from the moulding equipment.
- compression moulding techniques which i.e. means that the powder can be easily moulded to a high density component, which can be easily ejected from the moulding equipment.
- the resistivity of the coating surrounding the particles of the soft magnetic metal powder By altering for example the chemical composition or the thickness of the coating, the resisitivity is affected.
- improvements of the resistivity normally have a negative effect on the magnetic permeability of a soft magnetic composite component at a given density.
- a large number of patent publications teach different types of electrically insulating coatings.
- Heat treatment of the obtained soft magnetic composite body is applied in order to reduce the induced strains during moulding and promote the magnetic permeability.
- a higher heat treatment temperature is favourable in terms of permeability but reduces the resistivity.
- the allowable heat-treating temperature is restricted by the decomposition temperature of the resin.
- Lubricants used could be traditionally used lubricants for moulding of PM-components, such as Kenolube, metal stearates, ethylene-bis-stearamide or derivates of fatty acids, or materials which apart from being utilised as a binder for the soft magnetic composite component also will act as a lubricating agent, such as thermoplastic or thermosetting resins.
- the total amount of organic additives could be limited enabling the possibility of reaching higher green densities of the moulded body.
- a crucial aspect when moulding components based on insulated soft magnetic composite powder is that the insulation of the individual particles are maintained after moulding and ejection and especially that the coating of the particles which is in contact with the die wall are not deteriorated, i.e. that the resistivity of the surface of the component is not decreased. According to the present invention it has been found that a remarkable improvement in resistivity for a moulded, heat treated soft magnetic composite component (containing thermoplastic or thermosetting resins) can be obtained provided the moulding is performed with, the aid of die wall lubrication.
- EXAMPLE 1 This example describes the effect off die wall lubrication on the conductivity for a soft magnetic composite component compared with similar components produced without the aid of die wall lubrication .
- Ten magnetic rings with the dimensions 55x47x4 mm were produced by uniaxial moulding at three different moulding pressures. Five rings were produced with the aid of die wall lubrication and five rings without s uch lubrication.
- Two different compositions containing soft magnetic composite powder mixed with a binder we e tested.
- the soft magnetic composite powder was produced according to US Patent 6 348 265. Organsol in amounts of 0.4% and 0.6% by weight, respectively, was used as binder.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Soft Magnetic Materials (AREA)
- Powder Metallurgy (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003269761A AU2003269761A1 (en) | 2003-10-10 | 2003-10-10 | Method of producing a soft magnetic composite component with high resistivity |
PCT/SE2003/001579 WO2005035171A1 (en) | 2003-10-10 | 2003-10-10 | Method of producing a soft magnetic composite component with high resistivity |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/SE2003/001579 WO2005035171A1 (en) | 2003-10-10 | 2003-10-10 | Method of producing a soft magnetic composite component with high resistivity |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005035171A1 true WO2005035171A1 (en) | 2005-04-21 |
Family
ID=34432631
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE2003/001579 WO2005035171A1 (en) | 2003-10-10 | 2003-10-10 | Method of producing a soft magnetic composite component with high resistivity |
Country Status (2)
Country | Link |
---|---|
AU (1) | AU2003269761A1 (en) |
WO (1) | WO2005035171A1 (en) |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5980603A (en) * | 1998-05-18 | 1999-11-09 | National Research Council Of Canada | Ferrous powder compositions containing a polymeric binder-lubricant blend |
US6331270B1 (en) * | 1999-05-28 | 2001-12-18 | National Research Council Of Canada | Manufacturing soft magnetic components using a ferrous powder and a lubricant |
US6372348B1 (en) * | 1998-11-23 | 2002-04-16 | Hoeganaes Corporation | Annealable insulated metal-based powder particles |
WO2002089154A1 (en) * | 2001-05-02 | 2002-11-07 | National Research Council Of Canada | Manufacturing soft magnetic components using a ferrous powder and a lubricant |
US20020189714A1 (en) * | 2000-02-09 | 2002-12-19 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Method for the compaction of soft magnetic powder |
-
2003
- 2003-10-10 WO PCT/SE2003/001579 patent/WO2005035171A1/en not_active Application Discontinuation
- 2003-10-10 AU AU2003269761A patent/AU2003269761A1/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5980603A (en) * | 1998-05-18 | 1999-11-09 | National Research Council Of Canada | Ferrous powder compositions containing a polymeric binder-lubricant blend |
US6372348B1 (en) * | 1998-11-23 | 2002-04-16 | Hoeganaes Corporation | Annealable insulated metal-based powder particles |
US6331270B1 (en) * | 1999-05-28 | 2001-12-18 | National Research Council Of Canada | Manufacturing soft magnetic components using a ferrous powder and a lubricant |
US20020189714A1 (en) * | 2000-02-09 | 2002-12-19 | Kabushiki Kaisha Kobe Seiko Sho (Kobe Steel, Ltd.) | Method for the compaction of soft magnetic powder |
WO2002089154A1 (en) * | 2001-05-02 | 2002-11-07 | National Research Council Of Canada | Manufacturing soft magnetic components using a ferrous powder and a lubricant |
Also Published As
Publication number | Publication date |
---|---|
AU2003269761A1 (en) | 2005-04-27 |
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