CN1595555A - A rare-earth bonded magnet and method for manufacturing same - Google Patents
A rare-earth bonded magnet and method for manufacturing same Download PDFInfo
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- CN1595555A CN1595555A CN 200410027809 CN200410027809A CN1595555A CN 1595555 A CN1595555 A CN 1595555A CN 200410027809 CN200410027809 CN 200410027809 CN 200410027809 A CN200410027809 A CN 200410027809A CN 1595555 A CN1595555 A CN 1595555A
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Abstract
A rare earth bonded permanent magnet, is made by the steps that anisotropic rubidium-iron-nitrogen magnetic powder and plastic resin and processing aid are symmetrically mixed, mixture is heated under the temperature above fusion temperature of plastic resin then melts is injected into die in magnetic field whose magnetic field strength is 0.5~50,000 Oe to be cooled and be solidified and shaped. Its composites and mass contained are: anisotropic rubidium-iron-nitrogen magnetic powder of 84~97.5%, plastic resin of 2~12%, processing aid of 0.1~4%, it has the advantages of low cost, excellent magnetic behavior and high magnetic behavior, can be widely used in micro machine, automobile industry and electronic instrument fields.
Description
Affiliated technical field
The present invention relates to a kind of rare-earth bond magnet material, the invention still further relates to a kind of manufacture method of rare-earth bond magnet material.
Background technology
The manufacture method of rare-earth bond magnet is normally mixed rare-earth magnetic, binding agent and a small amount of processing aid, by compression molding method, extrusion moulding or injection moulding, makes magnet by its desired magnetic property and shape.
Mold pressing NdFeB magnet adopts the thermosetting resin binding agent, with die press technology for forming production, is a kind of manufacture method of using always.After NdFeB magnetic and thermosetting resin and a spot of lubricating auxiliary agent mixed, insert in the metal die of design in advance, under bigger pressure effect, make the magnet of definite shape, thermosetting resin cured with inside at a certain temperature then, to improve the mechanical strength of magnet, also to carry out surface treatment such as electrophoresis at last or spray paint.The magnet that makes with this method can have higher particle content, and having excellent magnetic characteristics of magnet still needs increase surface anticorrosion treatment process, and environment is had certain contaminative.
Also have and adopt thermoplastic resin to mix, the rare earth magnet of producing with injection molding technique, extruding-out process with the Nd-Fe-B magnetic.As described in CN 1167989A, having adopted thermoplastic resin is binding agent, it is magnetic that magnetic adopts R-Fe-B system, Sm-Co system or Sm-Fe-N, and described thermoplastic resin of this patent and above magnetic have certain compatibility, and the consumption of its explanation also is fit to the processing of above magnetic.Yet when using the less Magnaglo Nd-Fe-N of particle diameter, its consumption is no longer suitable, and its thermoplastic resin lipid species that is suitable for is also different.The magnet that adopts the Nd-Fe-B magnetic to make has very high magnetic property, but its shortcoming is also arranged: the antioxidant anticorrosive performance is bad, and magnet need carry out special surface treatment such as electrophoresis usually and spray paint; Though the anti-oxidation corrosivity of SmCo class magnet is good, magnetic property is not high, and Co is strategic materials, and it is restricted to originate.
The contained rare-earth magnetic Nd-Fe-B of the composition of above-mentioned rare earth magnet, the antioxidant anticorrosive performance is bad, and its processing has the certain fluidity requirement to required thermoplastic resin or thermosetting resin kind and consumption, is manufactured with certain difficulty.
Summary of the invention
The object of the present invention is to provide a kind of cost low, have excellent magnetic characteristics, good corrosion resistance, novel rare-earth bonded permanent magnet that mechanical strength is high.
Another object of the present invention is to provide the manufacture method of above-mentioned rare-earth bond magnet.
A kind of rare-earth bond magnet provided by the invention, its component and weight content are:
Anisotropy neodymium-iron-nitrogen magnetic 84～97.5%
Thermoplastic resin 2～12%
Processing aid 0.1～4%.
The basis of neodymium-iron-nitrogen magnetic that rare-earth bond magnet of the present invention adopts comprises rare earth element based on Nd, based on the transition metal of Fe, based on the basic element of N; Thermoplastic resin is selected one or more in polyamide, polyvinyl chloride, acrylic resin, phenylethylene resin series, polyphenylene oxide, polyformaldehyde, Merlon, polyphenylene sulfide, fluorine resin and the thermoplastic elastomer (TPE) for use; Processing aid is selected one or several in coupling agent, plasticizer, lubricant, age resistor and the antioxidant for use.
The manufacture method of rare-earth bound permanent magnet of the present invention is: at first that anisotropy neodymium-iron-nitrogen magnetic and thermoplastic resin, processing aid is mixing evenly, temperature more than the thermoplastic resin fusion adds the hot milling thing, in being the magnetic field of 0.5～50,000 Oe, magnetic field intensity fused mass is injected mould, the cooling curing moulding then.
Rare-earth magnetic of the present invention is neodymium-iron-nitrogen magnetic, contains rare earth element based on Nd, based on the transition elements of Fe, based on the basis of N.Different is that its antioxidant anticorrosive performance is relatively good with the Nd-Fe-B magnetic, has higher residual magnetic flux density, and the production technology of magnetic is simple, and magnetic middle rare earth content is few, the strategic material metallic cobalt that undopes, and economic benefit is also than Nd-Fe-B magnetic height.
The binding agent that the present invention adopts is a thermoplastic resin, the binding agent of mold pressing Nd-Fe-B magnet employing in the past is a thermosetting resin, it does not have thermoplastic resin to have good flowability and machinability like that, and mouldability is not fine, is binding agent so the present invention adopts thermoplastic resin.The choice relation of thermoplastic resin lipid species is to the size of the magnetic energy product of the complexity of the mechanical strength of magnet, serviceability temperature scope, moulding and acquisition.The thermoplastic resin that the present invention uses is one or more following blend: polyamide, polyvinyl chloride, acrylic resin, phenylethylene resin series, polyphenylene oxide, polyformaldehyde, Merlon, polyphenylene sulfide, fluorine resin.Adopt the reason of above resin to be, they and Nd-Fe-N magnetic have good compatibility, add the good fluidity in man-hour, and the magnet that makes in addition can have the better physical mechanical performance.At the kind time-like of selecting thermoplastic resin, its processing temperature is to need to consider that some process of resin temperature is quite high, the easy oxidation of Nd-Fe-N magnetic at this moment, and the processing temperature of resin does not surpass 380 ℃, preferably can be below 300 ℃.Sometimes in order to obtain good flowability and machinability, the degree of polymerization of thermoplastic resin being made certain requirement, is good with the molecular weight of 10000-50000.
Magnet of the present invention adopts injection moulding, this method of forming is meant in injection (mo(u)lding) machine magnet mixture heating and melting, to obtain the good fluidity of mixture, then this mixture is injected the metal die of design in advance, make the magnet of definite shape, this method of forming has many advantages: the freedom shape of magnet is big, magnet rate of finished products height, leftover bits and pieces of material can be recycled.Magnet need be earlier mixing evenly with the mixture of magnet before injection moulding, and the compounding process of employing can be the mixing method of roll-type, the mixing method of masticator, the mixing method of screw extruder.Mixing temperature is relevant because of the softening temperature of the thermoplastic resin of employing, its softening temperature is important reference factor when selecting the thermoplastic resin lipid species, but wherein to consider the highest processing temperature of neodymium-iron-nitrogen magnetic, and the temperature of mixing processing should be more than the molten melting temperatur of selected thermoplastic resin, to guarantee the good fluidity of mixture, magnetic is easy to the mixing with the thermoplastic resin binder under such temperature, and the thermoplastic resin of 160～200 ℃ of melt temperatures relatively is fit to the injection moulding of Nd-Fe-N magnet.
The present invention has following beneficial effect:
1. owing to adopt homemade anisotropy neodymium-iron-nitrogen rare-earth magnetic as raw material, raw material resources are abundant also can effectively to reduce cost.
2. because the corrosion resistance of anisotropy neodymium-iron-nitrogen rare-earth magnetic is better than the fast quenching NdFeB magnetic powder, so the corrosion resistance of magnet of the present invention is better, thereby its scope of application is wider.
3. magnet of the present invention has excellent mechanical intensity and good magnetic property.
4. magnet of the present invention can be widely used in electrical micro-machine, automobile making, fields such as electronic instrument.
Embodiment
Embodiment 1
It is the Nd-Fe-N powder of 2 μ m that magnetic adopts average grain diameter, weight accounts for 94% of mixture, binding agent adopts polyamide, and the fusing point of this resin is at 170 ℃, and weight accounts for 5.7%, processing aid adopts aminated compounds antioxidant, weight accounts for 0.3%, and this mixture is mixed in screw extruder, and melting temperature is 185 ℃, mixture was melted and was shaped to the wire of a diameter 3mm by a metal die this moment, and the wire magnet of gained is cut the graininess of growing into 4mm.
The granular mixture that makes is injected metal die by injection (mo(u)lding) machine, and melting temperature is 185 ℃ in the injection (mo(u)lding) machine, and mould places the alignment magnetic field of 10kOe, and the magnet profile that makes is high 10mm, and diameter is the cylinder of 10mm.
Detect the magnetic property of this magnet, maximum magnetic energy product (BH) max=5.6MGOe, magnet density is 4.82g/cm
2
Embodiment 2
It is the Nd-Fe-N powder of 2 μ m that magnetic adopts average grain diameter, weight accounts for 94% of mixture, binding agent adopts polyamide, and the fusing point of this resin is at 170 ℃, and weight accounts for 5.3%, processing aid adopts ketoamine compounds antioxidant, weight accounts for 0.7%, and this mixture is mixed in screw extruder, and melting temperature is 185 ℃, mixture was melted and was shaped to the wire of a diameter 3mm by a metal die this moment, and the wire magnet of gained is cut the graininess of growing into 4mm.
The granular mixture that makes is injected metal die by injection (mo(u)lding) machine, and melting temperature is 185 ℃ in the injection (mo(u)lding) machine, and mould places the alignment magnetic field of 10kOe, and the magnet profile that makes is high 10mm, and diameter is the cylinder of 10mm.
Detect the magnetic property of this magnet, maximum magnetic energy product (BH) max=6.0MGOe, magnet density is 4.93g/cm
2
Embodiment 3
It is the Nd-Fe-N powder of 2 μ m that magnetic adopts average grain diameter, weight accounts for 95% of mixture, binding agent adopts polyamide, and the fusing point of this resin is at 170 ℃, and weight accounts for 4.5%, processing aid adopts the hydrazine class compound antioxidant, weight accounts for 0.5%, and this mixture is mixed in screw extruder, and melting temperature is 185 ℃, mixture was melted and was shaped to the wire of a diameter 3mm by a metal die this moment, and the wire magnet of gained is cut the graininess of growing into 4mm.
The granular mixture that makes is injected metal die by injection (mo(u)lding) machine, and melting temperature is 185 ℃ in the injection (mo(u)lding) machine, and mould places the alignment magnetic field of 10kOe, and the magnet profile that makes is high 10mm, and diameter is the cylinder of 10mm.
Detect the magnetic property of this magnet, maximum magnetic energy product (BH) max=6.3MGOe, magnet density is 5.13g/cm
2
Embodiment 4
It is the Nd-Fe-N powder of 2 μ m that magnetic adopts average grain diameter, weight accounts for 94.5% of mixture, binding agent adopts polyformaldehyde, and the fusing point of this resin is at 175 ℃, and weight accounts for 4.7%, processing aid adopts the hydrazine class compound antioxidant, weight accounts for 0.8%, and this mixture is mixed in screw extruder, and melting temperature is 185 ℃, mixture was melted and was shaped to the wire of a diameter 3mm by a metal die this moment, and the wire magnet of gained is cut the graininess of growing into 4mm.
The granular mixture that makes is injected metal die by injection (mo(u)lding) machine, and melting temperature is 185 ℃ in the injection (mo(u)lding) machine, and mould places the alignment magnetic field of 10kOe, and the magnet profile that makes is high 10mm, and diameter is the cylinder of 10mm.
Detect the magnetic property of this magnet, maximum magnetic energy product (BH) max=6.1MGOe, magnet density is 5.04g/cm
2
Above embodiment magnet handling ease realizes, has excellent magnetic characteristics the mechanical strength height.
Comparative example 1
It is the Nd-Fe-N powder of 2 μ m that magnetic adopts average grain diameter, weight accounts for 90% of mixture, binding agent adopts polyamide, and the fusing point of this resin is at 170 ℃, and weight accounts for 8.5%, processing aid adopts the aminated compounds antioxidant, weight accounts for 1.5%, and this mixture is mixed in screw extruder, and melting temperature is 185 ℃, mixture was melted and was shaped to the wire of a diameter 3mm by a metal die this moment, and the wire magnet of gained is cut the graininess of growing into 4mm.
The granular mixture that makes is injected metal die by injection (mo(u)lding) machine, and melting temperature is 185 ℃ in the injection (mo(u)lding) machine, and mould places the alignment magnetic field of 10kOe, and the magnet profile that makes is high 10mm, and diameter is the cylinder of 10mm.
Detect the magnetic property of this magnet, maximum magnetic energy product (BH) max=4.3MGOe, magnet density is 4.59g/cm
2This magnet magnetic property is not high,
Comparative example 2
It is the Nd-Fe-N powder of 2 μ m that magnetic adopts average grain diameter, and weight accounts for 97.5% of mixture, and binding agent adopts polyamide, and the fusing point of this resin is at 170 ℃, and weight accounts for 2.5%, and this mixture is used 5t/cm in metal die
2The external force compression forming, temperature is 185 ℃ in the metal die, mould places the alignment magnetic field of 10kOe, the magnet profile that makes is high 10mm, diameter is the cylinder of 10mm.
This magnet has breaking of corner when taking out from metal die, and give birth to hot problem because of inside, and the magnetic oxidation is serious, the phenomenon of catching fire occurs, difficult forming.
With reference to embodiments of the invention and comparative example, the magnet that the present invention makes has good magnetic characteristic, higher mechanical strength, good resistance to oxidation corrosive nature, and processing fluidity is good.
Claims (5)
1, a kind of rare-earth bond magnet, its component and weight content are:
Anisotropy neodymium-iron-nitrogen magnetic 84～97.5%
Thermoplastic resin 2～12%
Processing aid 0.1～4%.
2, rare-earth bond magnet according to claim 1 is characterized in that: the basis of described anisotropy neodymium-iron-nitrogen magnetic comprises rare earth element based on Nd, based on the transition metal of Fe, based on the basic element of N.
3, rare-earth bond magnet according to claim 1 is characterized in that: described thermoplastic resin is selected one or more in polyamide, polyvinyl chloride, acrylic resin, phenylethylene resin series, polyphenylene oxide, polyformaldehyde, Merlon, polyphenylene sulfide, fluorine resin and the thermoplastic elastomer (TPE) for use.
4, rare-earth bond magnet according to claim 1 is characterized in that: described processing aid is selected one or several in coupling agent, plasticizer, lubricant, age resistor and the antioxidant for use.
5, the manufacture method of the described rare-earth bond magnet of a kind of claim 1, it is characterized in that: at first that anisotropy neodymium-iron-nitrogen magnetic and thermoplastic resin, processing aid is mixing evenly, temperature more than the thermoplastic resin fusion adds the hot milling thing, in being the magnetic field of 0.5～50,000 Oe, magnetic field intensity fused mass is injected mould, the cooling curing moulding then.
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| CN 200410027809 CN1595555A (en) | 2004-06-28 | 2004-06-28 | A rare-earth bonded magnet and method for manufacturing same |
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| CN 200410027809 CN1595555A (en) | 2004-06-28 | 2004-06-28 | A rare-earth bonded magnet and method for manufacturing same |
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| CN1595555A true CN1595555A (en) | 2005-03-16 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100403434C (en) * | 2005-06-10 | 2008-07-16 | 上海爱普生磁性器件有限公司 | Hard disk driver magnet and its preparation method |
| CN102181156A (en) * | 2011-05-25 | 2011-09-14 | 深圳市科聚新材料有限公司 | Polyphenylene sulfide composite material and preparation method thereof |
| WO2012031462A1 (en) * | 2010-09-10 | 2012-03-15 | 广州新莱福磁电有限公司 | Flexible magnetic plastic film with added recycled plastics |
| CN101299364B (en) * | 2008-03-13 | 2012-07-18 | 上海爱普生磁性器件有限公司 | Agglutinate rare earth magnet for blue laser optical disc drive as well as preparing method thereof |
| CN114023551A (en) * | 2021-10-12 | 2022-02-08 | 横店集团东磁股份有限公司 | Anisotropic rubber composite rare earth permanent magnet orientation forming process |
-
2004
- 2004-06-28 CN CN 200410027809 patent/CN1595555A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100403434C (en) * | 2005-06-10 | 2008-07-16 | 上海爱普生磁性器件有限公司 | Hard disk driver magnet and its preparation method |
| CN101299364B (en) * | 2008-03-13 | 2012-07-18 | 上海爱普生磁性器件有限公司 | Agglutinate rare earth magnet for blue laser optical disc drive as well as preparing method thereof |
| WO2012031462A1 (en) * | 2010-09-10 | 2012-03-15 | 广州新莱福磁电有限公司 | Flexible magnetic plastic film with added recycled plastics |
| CN102181156A (en) * | 2011-05-25 | 2011-09-14 | 深圳市科聚新材料有限公司 | Polyphenylene sulfide composite material and preparation method thereof |
| CN102181156B (en) * | 2011-05-25 | 2013-01-30 | 深圳市科聚新材料有限公司 | Polyphenylene sulfide composite material and preparation method thereof |
| CN114023551A (en) * | 2021-10-12 | 2022-02-08 | 横店集团东磁股份有限公司 | Anisotropic rubber composite rare earth permanent magnet orientation forming process |
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