EP1199729A1 - Aimant flexible moulable à liant et procédé de fabrication d'un tel aimant - Google Patents

Aimant flexible moulable à liant et procédé de fabrication d'un tel aimant Download PDF

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Publication number
EP1199729A1
EP1199729A1 EP01650115A EP01650115A EP1199729A1 EP 1199729 A1 EP1199729 A1 EP 1199729A1 EP 01650115 A EP01650115 A EP 01650115A EP 01650115 A EP01650115 A EP 01650115A EP 1199729 A1 EP1199729 A1 EP 1199729A1
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EP
European Patent Office
Prior art keywords
compound
magnetic
bonded magnet
thermoplastic elastomer
flexible
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Withdrawn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
EP01650115A
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German (de)
English (en)
Inventor
James Carlberg
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.)
Arnold Engineering Co
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Arnold Engineering Co
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Filing date
Publication date
Application filed by Arnold Engineering Co filed Critical Arnold Engineering Co
Publication of EP1199729A1 publication Critical patent/EP1199729A1/fr
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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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/04—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 hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/0555—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together
    • H01F1/0558—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 pressed, sintered or bonded together bonded together
    • 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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/04—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 hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
    • H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
    • H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
    • H01F1/0578—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together bonded together
    • 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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/04—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 hard-magnetic materials metals or alloys
    • H01F1/047—Alloys characterised by their composition
    • H01F1/053—Alloys characterised by their composition containing rare earth metals
    • H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
    • H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2
    • 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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/04—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 hard-magnetic materials metals or alloys
    • H01F1/06—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder
    • H01F1/08—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
    • H01F1/083—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 hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together in a bonding agent
    • 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
    • H01F1/032—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 hard-magnetic materials
    • H01F1/10—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure
    • H01F1/11—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles
    • H01F1/113—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 hard-magnetic materials non-metallic substances, e.g. ferrites, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure in the form of particles in a bonding agent
    • H01F1/117—Flexible bodies
    • 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
    • H01F41/0253—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 for manufacturing permanent magnets
    • H01F41/0266—Moulding; Pressing

Definitions

  • the present invention relates to the field of magnetic parts and devices of the type used in a variety of industrial devices and other applications. More specifically, this invention relates to the field of flexible bonded magnetic compounds used in such devices and applications, and to the methods for producing such compounds.
  • bonded magnets i.e. , magnets which are manufactured by mixing a plastic or rubber material with magnetic powder and either pouring the mixture into a mold or extruding it.
  • Bonded magnets have several advantages over other types of magnets. They can be more cost effectively formed into a variety of shapes while allowing many magnetization patterns. Bonded magnets are also tougher and more chip resistant than other types of magnets.
  • the bonded magnet is typically made from a mixture of thermoset rubber material and large amounts of magnetic material (e.g. , ferrite material). Since the rubbery thermoset material is not amenable to processing by injection molding, the resulting compound must be either calendered or extruded into sheets from which magnetic parts are punched. Unfortunately, parts made this way can only be magnetized through their thickness, and cannot be made into complex shapes. Thus, such bonded magnets, though flexible, cannot be made to conform to a variety of magnetization patterns or complex shape specifications, characteristics that are desirable in many applications.
  • the bonded magnet is typically made from a mixture of thermoplastic and magnetic materials. The mixture is then generally injection molded and magnetized to specification resulting in a customized magnetic part.
  • thermoplastics tend to be very stiff and brittle. Thus, such bonded magnets, though customized to specification, do not stand up well to tension or other forces impacting the magnetic parts.
  • a bonded magnet made of a material that is flexible, capable of being molded into complex shapes, and capable of being magnetized in accordance with a variety of magnetization patterns.
  • the present invention addresses this need.
  • the present invention provides a flexible, elastic magnet compound that can be molded into complex shapes and magnetized in a variety of patterns.
  • the preferred embodiments exploit the unique performance characteristics of thermoplastic elastomer materials, which provide a bonded magnet with the desired properties.
  • the magnetic compound of the preferred embodiments comprises: (1) 25% to 50% by volume of styrenic or polyamide based thermoplastic elastomer; (2) 50% to 70% by volume of magnetic material; and (3) 0% to 5% by volume of an internal lubricant.
  • the thermoplastic elastomer component of the compound provides the bonded magnet with flexibility and resistance to tension sufficient for most applications.
  • the thermoplastic elastomer component also makes the bonded magnet amenable to injection molding processing.
  • the bonded magnet can be manufactured by: (1) blending magnetic materials; (2) granulating the magnetic material(s) with thermoplastic elastomer material(s) and a lubricant material; (3) injection molding the granulated compound; and (4) magnetizing the resulting molded part.
  • the result is a flexible bonded magnet compound, which is also, injection molded and magnetized to detailed specification, if so desired.
  • Figure 1 it is a flow chart depicting a process, existing in the prior art, for forming flexible bonded magnets of the type in conventional use.
  • Step 100 the manufacturer begins with raw materials used to form the flexible bonded magnet.
  • the raw materials typically include thermoset elastomers, such as nitrile rubber, which give the magnet its elastic quality.
  • Thermoset elastomers experience chemical change during processing and become permanently insoluble and infusible.
  • Other examples of thermoset polymers include elastomers such as natural rubber or EPDM.
  • Step 110 the raw materials are mixed, typically using machinery designed expressly for the purpose.
  • the materials are fed through two roll components of an external compounder. As the material passes through the rollers, it is compacted, spread out and periodically sheared and folded to enhance the mixing. After allowing for a mixing period, the mixed material is cut and removed from the compounder.
  • Step 120 the mixed compound is granulated (i.e. , reduced to small particles).
  • the granulation ensures consistent material flow in later processing.
  • the compound includes thermoset elastomer material, it is not amenable to injection molding, and accordingly cannot be molded to precise, complex shape specifications. Instead, the granulated compound is next extruded or calendered. This also means the finished bonded magnet can only be magnetized through its thickness, rather than in accordance with any variety of magnetization patterns.
  • step 130a the granulated compound is fed into an extruding machine.
  • an extruder consists of a hollow heated barrel.
  • the extruder also utilizes a screw, which forces the softened compound through a shaping orifice. As it exits the extruder, the shaped compound is cooled and hardened.
  • Step 130b the granulated compound is fed in between two rolls of a calendaring machine.
  • the rolls squeeze the material into a continuous sheet that is wound onto a drum.
  • Step 140 the sheet or parts consisting of the compound are further cut, shaped and otherwise undergo finishing operations required to produce the final bonded magnet product.
  • an improved method for manufacturing bonded magnets is provided.
  • Figure 2 shows a flow chart depicting an improved process for forming a flexible bonded magnet in accordance with an embodiment of the present invention.
  • a manufacturer receives and blends magnetic materials.
  • the raw materials may include barium ferrite, strontium ferrite, neodymium-iron-boron and samarium cobalt powders.
  • a magnetic compound is formed by mixing the magnetic powder with a thermoplastic elastomer material and a lubricant material using, for example, a twin screw compounding extruder.
  • a thermoplastic elastomer is, generally speaking, a block copolymer.
  • ABAB ABAB
  • One segment is hard and crystalline.
  • the other is soft and amorphous. When solid, the hard segments crystallize forming linkages allowing the soft parts to stretch while retaining shape. When molten, the hard segments become unordered allowing processing.
  • thermoplastic elastomers are flexible materials that can generally be elongated to more than double their original length at room temperature and yet re-assume their original length when tension is released. Equally importantly, they exhibit the advantageous processing characteristics of thermoplastic materials.
  • the mixed compound is granulated (i.e. , reduced to small particles).
  • the granulation ensures consistent material flow in later processing.
  • the compound utilizes a thermoplastic elastomer rather than a thermoset elastomer material to achieve flexibility
  • the compound is amenable to further processing by injection molding. Accordingly, the compound can be molded to precise, complex shape specifications and may also be magnetized in accordance with a variety of magnetization patterns.
  • Step 230 the granulated compound is fed into an injection molding machine.
  • injection molding machines may include a variety of vertical, horizontal and rotary molds depending upon the given application and the nature of the shape characteristics and magnetic field orientation desired.
  • Step 240 the molded parts are placed in magnetizing fixtures specifically made for the part size and shape.
  • the magnetizing fixtures function to pulse magnetize the parts, resulting in the finished, flexible bonded magnet product. This may also be done as in integral part of injection molding in Step 230.
  • a magnetic closure might be used to replace Velcro® like latches in a variety of products.
  • the magnetic closure might include a first magnet coupled to a flap, which in turn is coupled to the closure, and a second magnet also coupled to a bonding location on the closure.
  • Either or both of the magnets could be comprised of a flexible bonded magnet compound made in accordance with the present invention.
  • Such a fastener made in accordance with the present invention, is flexible enough to withstand tension, twisting and to conform to the shape of the particularized environment in which it may operate (e.g. , the shape of a human hand in the case of a magnetic golf glove closure). It can also be molded to fit precisely in such an environment.
  • a bonded magnet made in accordance with the present invention is particularly well suited to increasingly popular magnetic position sensor applications, such as magnetic sensor cylinders.
  • a flexible bonded magnetic sensor made in accordance with the present invention can easily be made to the precise tolerances demanded by such applications. These designs tend to be thicker than can currently be achieved by punching from flexible sheet stock, but such dimensions are not a problem for injection molding. While standard injection molded magnets may also have favorable characteristics, they are not flexible enough to allow installation. When made with the present invention, parts have the desired magnetic performance level characteristics and can withstand the fluids and temperatures seen during operation of the sensors.
  • FIG. 3 shows constituents of a bonded magnetic compound in accordance with an embodiment of the present invention.
  • a preferred magnetic compound in accordance with the present invention comprises: 1) 25% to 50% by volume of styrenic or polyamide based thermoplastic elastomer or polymeric elastomer; (2) 50% to 70% by volume of magnetic material, such as, barium hexaferrite, strontium hexaferrite, neodymium-iron-boron powder, samarium cobalt powder, samarium iron nitride and aluminum nickel cobalt; and (3) 0% to 5% by volume of an internal lubricant.
  • thermoplastic elastomer material it may be either styrenic or polyamide based. Styrenic based materials work well in air and polar solvents, such as water. Polyamide based materials work well in non-polar solvents, such as oil. Other thermoplastic elastomer materials might include polyurethanes and polyesters. If the thermoplastic elastomer constituent is greater than the specified range, this comes at the cost of reducing the magnetic material amount and will lower the magnetic performance of the resulting compound to the point where it no longer is commercially viable product. If the thermoplastic elastomer constituent is lower than the specified range, the resulting compound will not exhibit physical properties unique to the present invention.
  • the compound would not have elasticity exceeding current compounds and would become physically weaker. Also, if the compound is based on anisotropic materials such as ferrite, the level of magnetic material will become too high. In particular, anisotropic materials must orient or move during the molding process under the influence of a magnetic field. When the number of magnetic particles is too high, they interfere with each other's orientation reducing magnetic performance.
  • the internal lubricant material With respect to the internal lubricant material, it makes the compound more processable. It also improves magnetic performance through better orientation when anisotropic magnetic materials, such as barium ferrite, are used. Also, if too much internal lubricant is used, the resulting compound will be too weak physically to be marketable.
  • both the amount (as mentioned above) and type of magnetic material used are important to both the physical and magnetic properties of the final compound.
  • the effects of types of magnetic material are not detailed here as these effects of the various magnetic materials on magnetic performance are well known.
  • the compound includes an optimum amount of 63% by volume barium hexaferrite magnetic material using a styrenic based thermoplastic elastomer. Further, in another preferred embodiment of the present invention, the compound includes an optimum amount of 61% by volume barium hexaferrite using a polyamide based thermoplastic elastomer.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Hard Magnetic Materials (AREA)
EP01650115A 2000-10-20 2001-10-09 Aimant flexible moulable à liant et procédé de fabrication d'un tel aimant Withdrawn EP1199729A1 (fr)

Applications Claiming Priority (2)

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US69320900A 2000-10-20 2000-10-20
US693209 2000-10-20

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004072995A1 (fr) 2003-02-14 2004-08-26 Dowa Mining Co., Ltd. Poudre magnetique de ferrite et son procede de production
EP1930399A1 (fr) * 2006-11-30 2008-06-11 Petroleo Brasileiro S.A. Petrobras Composant intermétallique magnétisé et huile de lubrification contenant ce composant
CN100395850C (zh) * 2005-09-16 2008-06-18 华南理工大学 注射成型后原位聚合制备粘结NdFeB磁体的方法
CN100593828C (zh) * 2007-04-06 2010-03-10 浙江工业大学 一种NdFeB/PPS注射成型颗粒料的制备方法
US8440128B2 (en) 2007-11-26 2013-05-14 Thomas G. Love Flexible magnetic sheet systems
WO2014029047A1 (fr) * 2012-08-20 2014-02-27 南通万宝实业有限公司 Bande magnétique composite nd-fe-b anisotrope, procédé pour sa fabrication et dispositif l'utilisant
WO2013091943A3 (fr) * 2011-12-21 2014-05-01 Robert Bosch Gmbh Rotor pour un moteur électrique présentant des aimants fixés par un matériau thermoplastique ainsi que son procédé de fabrication
RU2705155C1 (ru) * 2019-08-08 2019-11-05 Павел Михайлович Степанчиков Композиция для получения магнитотвердых ферритов и способ их получения
CN112177901A (zh) * 2020-09-23 2021-01-05 合肥工业大学 一种基于电磁原理的液体量取调配装置及其制作方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903228A (en) * 1970-08-12 1975-09-02 Minnesota Mining & Mfg Flexible ferrite-particle magnets
US4308155A (en) * 1976-11-24 1981-12-29 Tdk Electronics Co., Ltd. Rubber or plastic magnet and magnetic powder for making the same
US5958283A (en) * 1996-12-19 1999-09-28 Ems-Inventa Ag Thermoplastically processible molding material

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3903228A (en) * 1970-08-12 1975-09-02 Minnesota Mining & Mfg Flexible ferrite-particle magnets
US4308155A (en) * 1976-11-24 1981-12-29 Tdk Electronics Co., Ltd. Rubber or plastic magnet and magnetic powder for making the same
US5958283A (en) * 1996-12-19 1999-09-28 Ems-Inventa Ag Thermoplastically processible molding material

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004072995A1 (fr) 2003-02-14 2004-08-26 Dowa Mining Co., Ltd. Poudre magnetique de ferrite et son procede de production
EP1594144A1 (fr) * 2003-02-14 2005-11-09 Dowa Mining Co., Ltd. Poudre magnetique de ferrite et son procede de production
EP1594144A4 (fr) * 2003-02-14 2010-12-15 Dowa Electronics Materials Co Poudre magnetique de ferrite et son procede de production
CN100395850C (zh) * 2005-09-16 2008-06-18 华南理工大学 注射成型后原位聚合制备粘结NdFeB磁体的方法
EP1930399A1 (fr) * 2006-11-30 2008-06-11 Petroleo Brasileiro S.A. Petrobras Composant intermétallique magnétisé et huile de lubrification contenant ce composant
CN100593828C (zh) * 2007-04-06 2010-03-10 浙江工业大学 一种NdFeB/PPS注射成型颗粒料的制备方法
US8440128B2 (en) 2007-11-26 2013-05-14 Thomas G. Love Flexible magnetic sheet systems
WO2013091943A3 (fr) * 2011-12-21 2014-05-01 Robert Bosch Gmbh Rotor pour un moteur électrique présentant des aimants fixés par un matériau thermoplastique ainsi que son procédé de fabrication
WO2014029047A1 (fr) * 2012-08-20 2014-02-27 南通万宝实业有限公司 Bande magnétique composite nd-fe-b anisotrope, procédé pour sa fabrication et dispositif l'utilisant
RU2705155C1 (ru) * 2019-08-08 2019-11-05 Павел Михайлович Степанчиков Композиция для получения магнитотвердых ферритов и способ их получения
CN112177901A (zh) * 2020-09-23 2021-01-05 合肥工业大学 一种基于电磁原理的液体量取调配装置及其制作方法

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