CN100400205C - Method for forming nano crystal double phase anisotropic neodymium iron boron binding magnet and apparatus thereof - Google Patents
Method for forming nano crystal double phase anisotropic neodymium iron boron binding magnet and apparatus thereof Download PDFInfo
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- CN100400205C CN100400205C CNB2005101119339A CN200510111933A CN100400205C CN 100400205 C CN100400205 C CN 100400205C CN B2005101119339 A CNB2005101119339 A CN B2005101119339A CN 200510111933 A CN200510111933 A CN 200510111933A CN 100400205 C CN100400205 C CN 100400205C
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- iron boron
- neodymium iron
- magnet
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Abstract
The present invention relates to a forming method and special equipment of a nanometer crystal biphase anisotropy neodymium iron boron binding magnet. The method of the present invention comprises the following steps: isotropy NdFeB magnetic powder is loaded in a steel sleeve, and at the same time, the isotropy NdFeB magnetic powder is positioned on a fixed base which is provided with a circular cartridge through the processing of a magnetic field. Then, the explosive which is loaded in the cartridge is detonated, and the explosion forming blank is solidified to obtain the anisotropy neodymium iron boron binding magnet. The present invention has the obvious characteristic that the nanometer crystal isotropy neodymium iron boron magnetic powder is prpared to the nanometer crystal anisotropy neodymium iron boron magnet. The maximum magnetic energy product of the anisotropy neodymium iron boron magnet which is prepared with the method of the present invention can reach 122KJ /m<3>. The magnetism performances of the magnet such as the density, the intrinsic coercive force, etc. are enhanced obviously.
Description
Technical field
The present invention relates to the forming method and the isolated plant thereof of a kind of nano crystal double phase anisotropic neodymium iron boron binding magnet or metal dust, belong to metal dust extrusion forming technology field.
Background technology
Nanocrystalline two-phase composite permanent-magnet alloy is the permanent-magnet material of a novel concept proposing in recent years, this class alloy combines the mutually high magnetocrystalline of the Hard Magnetic saturation magnetization mutually high with soft magnetism, by the coupling of the ferromagnetic exchange under the nanoscale, produce high comprehensive magnetic property.A distinguishing feature of this alloy is that remanent magnetism increases effect, and in addition, expensive content of rare earth reduces, thereby produces good economic benefit.Wherein Hard Magnetic is Nd mutually
2Fe
14B or Sm
2Fe
17N
3, soft magnetism is Fe mutually
3B or a-Fe etc., this patent used magnetic material alloys is nanocrystalline Nd
2Fe
14B/a-Fe two-phase neodymium iron boron.
The neodymium iron boron Magnaglo is mixed with 2～5% binding agent, at the certain pressure compacted under, can produce various Agglutinate neodymium-iron-boron magnet rings, magnetic shoe sheet etc., its purposes is very extensive, particularly computer industry.As the voice coil motor of computer hard disc driver, the spindle motor among typewriter, DVD, the CD, the vibrating motor of mobile phone, the magnetic sensor of vehicle mounted, gyrounit of aircraft controller or the like.Exactly because the extensive use of these magnetic materials, integrated, miniaturization, lightweight, intelligentized development to information industry have great importance.The Agglutinate neodymium-iron-boron magnet material that uses all is an isotropism at present, its theoretical magnetic energy product has only 1/4th of the theoretical magnetic energy product of anisotropic material, for this reason, the development of the making of anisotropic magnet powder and anisotropic bonded magnet is an important directions of present bonded permanent magnet.
The moulding process of existing preparation anisotropy neodymium iron boron binding magnet has three kinds of methods, and anisotropic magnetic powder and certain binding agent is mixed. and adopt the method for compression moulding, injection moulding, extrusion modling to be molded into final products.There are two common problems 1 in they) powder before the moulding all be the anisotropy NdFeB magnetic powder, 2) the more binding agent of needs during moulding, and also the magnet density that moulding makes is less, and the anisotropic bonded magnet magnetic property that is prepared into is relatively poor.When compression moulding is used in typical moulding, technology is as follows: anisotropy neodymium iron boron Magnaglo and binding agent are mixed (binding agent is a resinoid bond, addition is 2～5wt%), must carry out magnetic field compacting magnetic field (100～600Mpa) moulding under the pressure, solidify 15h down at 150 ℃ then, obtain anisotropic bonded magnet at last.With Nd
11.2Fe
66Co
15Zr
0.1Ga
0.50B
6.8The used Formulation Example of preparation anisotropic magnet powder, binding agent at its 5wt% is down mixed, (magnetic field intensity is 12～15T to carry out under the magnetic field compacting under must pressure, pressure is 100～600Mpa) moulding, solidify 1～2h down at 130～180 ℃ then, the performance of the anisotropic bonded magnet that makes for its various performance parameters is: the density of bonded permanent magnet is 6.016g/cm
3, remanent magnetism B
1=0.659T (tesla), HCJ
JHc=629KA/m, maximum magnetic energy product (BH) max=68KJ/m
3, the squareness of curve is 25%.
Summary of the invention
The purpose of this invention is to provide and a kind ofly utilize nanocrystalline two-phase isotropism NdFeB magnetic powder to prepare the forming method of nano crystal double phase anisotropic bonded permanent magnet.Another object of the present invention provides a kind of isolated plant of forming method of nano crystal double phase anisotropic bonded permanent magnet.Still a further object of the present invention is at the resinoid bond that uses seldom, adopts the explosive forming method to make the nano crystal double phase anisotropic neodymium iron boron binding magnet of the high magnetic performance of high density.
The objective of the invention is to implement by following technical proposals.
1. the forming method of a nano crystal double phase anisotropic neodymium iron boron binding magnet the method is characterized in that to have following processing step:
A evenly mixes the isotropic neodymium iron boron Magnaglo of nanocrystalline two-phase with 0.05～1.5wt% binding agent, pack into subsequently in the steel sleeve pipe 6. slowly carry out during the dress powder, the jolt ramming while pack into, and through the processing in 10～15T magnetic field, powder is filled rear sleeve and is sealed with 4 welding of steel plug at two ends about in the of 6 simultaneously;
B places sleeve pipe 6 on the round plastic plate firm banking 8, base places on the level ground, places circular dynamite container on base, puts on sleeve pipe 6 upper end plugs again and can load and unload briquetting 3, the ammonium nitrate base explosive of evenly packing in dynamite container then, explosive density is 0.75～1.30g/cm
3, the thickness of the explosive of packing into is 25～70mm,
C is by igniting at the fuzing system, armament 1 at place, pinnacle, dynamite container top.Shock wave that blast is produced and high pressure make the magnetic powder compacting and bond together, and the explosive forming base is solidified 1～2h. down at 130～180 ℃
Generate the nano crystal double phase anisotropic neodymium iron boron binding magnet of the high magnetic performance of high density.
Explosive compaction shaped device of the present invention includes fuzing system, armament 1, explosive 2, can load and unload the steel plug 4 of briquetting 3, solder up, the isotropic neodymium iron boron Magnaglo 5 of nanocrystalline two-phase, steel sleeve pipe 6, circular dynamite container 7 and firm banking 8, it is characterized in that: the steel sleeve pipe 6 that the isotropic neodymium iron boron Magnaglo 5 of nanocrystalline two-phase is housed is arranged in the circular dynamite container 7, and be positioned at middle position, the bottom of circular dynamite container 7 is fixed on the firm banking 8; The upper and lower of steel sleeve pipe 6 all is provided with the steel plug 4 of solder up, also is provided with on the plug 4 on top and can loads and unloads briquetting 3; Explosive 2 is equipped with in space between steel sleeve pipe 6 and dynamite container 7; Place, pinnacle at dynamite container 7 tops is provided with fuzing system, armament 1.
In this explosive compaction shaped device, the pipe thickness of described steel sleeve pipe is 0.5～2.0mm; Described firm banking is the round plastic plate, and its thickness is 8～12mm.
Nanocrystalline two-phase isotropism NdFeB Magnaglo of the present invention can make like this: at first be ready to raw material, with Nd
8.5(FeCoZr)
84.5Cr
0.5B
6.5On the basis of stoichiometry prescription, bring disaster to the method for quenching by melt and obtain the amorphous magnet, handle obtaining nanocrystalline two-phase isotropism NdFeB magnet powder again through crystallization.
The distinguishing feature of the inventive method is nanocrystalline two-phase isotropism NdFeB magnetic powder can be prepared into the nano crystal double phase anisotropic neodymium iron boron magnet.With the isotropic NdFeB magnetic of nanocrystalline two-phase powder, be contained in the steel sleeve pipe, adopt explosion formation method, utilize impact generated by explosion ripple and pressure to bond and the compacting powder, thereby generate the nano crystal double phase anisotropic neodymium iron boron binding magnet of the high magnetic performance of high density.
The inventive method has changed conventional method and has prepared the required anisotropy NdFeB magnetic powder of anisotropy magnet, and substitutes with nanocrystalline two-phase isotropism NdFeB magnetic powder, is about to conventional composition Nd
11.2Fe
66Co
15Zr
0.1Ga
0.50B
6-8Change into Nd
8.5(FeCoZr)
84.5Cr
0.5B
6.5, greatly reduce the content of rare earth that produces anisotropic bonded magnet, thereby reduced the cost of product.The addition of common compression moulding binding agent is 2～5%, and the addition of explosive forming binding agent of the present invention is 0.05～15wt% only, the addition of binding agent when being lower than common compression moulding.On its nanocrystalline basis of not growing up, keep nanocrystalline structure with the prepared anisotropic bonded magnet of the inventive method, thereby improved the density and the magnetic performance of nanocrystalline magnet.Compare with the prepared magnet of traditional briquetting process with the prepared neodymium iron boron anisotropic bonded permanent magnet of the inventive method, improved the density of magnet and the squareness of maximum magnetic energy product, remanent magnetism Br, HCJ and curve greatly.
Description of drawings
Fig. 1 is the schematic diagram of explosive compaction shaped device.
Each digital code is expressed as follows among the figure:
1 fuzing system, armament, 2 explosives 3 can load and unload steel plug 5 nanocrystalline two-phase isotropism neodymium iron boron powder 6 steel sleeve pipes 7 circular dynamite container 8 firm bankings of briquetting 4 solder ups
The specific embodiment
Describe the present invention below in conjunction with accompanying drawing 1.
Embodiment 1
Nanocrystalline isotropism NdFeB magnetic powder is like this preparation among the embodiment, at first is ready to raw material, with Nd
8.5(FeCoZr)
84.5Cr
0.5B
6.5On the basis of stoichiometry prescription, obtain the amorphous magnet, handle obtaining nanocrystalline diphasic magnet powder again through crystallization by the fast melt-quenching method; Nanocrystalline two-phase isotropism NdFeB magnetic powder powder is evenly mixed with the 0.2wt% binding agent, pack into subsequently in the steel sleeve pipe 6, the pipe thickness of steel sleeve pipe 6 is 1.5mm, slowly carry out during the dress powder, the jolt ramming while pack into, and the processing under 12T magnetic field simultaneously, sleeve pipe are sealed with 4 welding of steel plug at two ends about in the of 6; Sleeve pipe 6 is placed on the round plastic plate firm banking 8, its thickness is 10mm, base places on the level ground, on base, place circular dynamite container, on sleeve pipe 6 upper end plugs, put again and can load and unload briquetting 3, the explosive of in dynamite container, evenly packing into then, explosive is an ammonium nitrate base explosive, its density is 0.90-1.30g/cm
3, the thickness of the explosive of packing into is 50mm.Ignite by promptly putting detonator at the fuzing system, armament 1 at place, pinnacle, dynamite container top.Shock wave that blast is produced and high pressure make the magnetic powder compacting and bond together, and at last the explosive forming base are solidified 1h down at 160 ℃, generate the nano crystal double phase anisotropic neodymium iron boron binding magnet of the high magnetic performance of high density.By the amount of control explosive, control the size of shock wave, can control the adhesion strength of Magnaglo.The density of the bonded permanent magnet that makes is 6.98g/cm
3, remanent magnetism Br=0.864T (tesla), HCJ jHc=755KA/m, maximum magnetic energy product (BH) max=122KJ/m
3, the squareness of curve is 50%.
Embodiment 2
Nanocrystalline two-phase isotropism NdFeB magnetic powder powder is evenly mixed with the 0.3wt% binding agent, pack into subsequently in the steel sleeve pipe 6, the pipe thickness of steel sleeve pipe 6 is 1mm, slowly carry out during the dress powder. the jolt ramming while pack into, and the processing under 10T magnetic field simultaneously, sleeve pipe are appointed with steel plug 4 welding envelopes at two ends about in the of 6; Sleeve pipe 6 is placed on the round plastic plate firm banking 8, its thickness is 10mm, base places on the level ground, on base, place circular dynamite container, on sleeve pipe 6 upper end plugs, put again and can load and unload briquetting 3, the explosive of in dynamite container, evenly packing into then, explosive is an ammonium nitrate base explosive, its density is 0.90g/cm
3, the thickness of the explosive of packing into is 60mm.Ignite by promptly putting detonator at the fuzing system, armament 1 at place, pinnacle, dynamite container top.Shock wave that blast is produced and high pressure make the magnetic powder compacting and bond together, and the explosive forming base is solidified 1h down at 170 ℃, generate the nano crystal double phase anisotropic neodymium iron boron binding magnet of the high magnetic word of high density performance.The density of the bonded permanent magnet that makes is 7.00g/cm
3, remanent magnetism Br=0.842T (tesla), HCJ
JHc=768KA/m, maximum magnetic energy product (BH) max=121KJ/m
3, the squareness of curve is 50%.
Embodiment 3
Nanocrystalline two-phase isotropism NdFeB magnetic powder powder is evenly mixed with the 0.5wt% binding agent, pack into subsequently in the steel sleeve pipe 6, the pipe thickness of steel sleeve pipe 6 is 1mm, slowly carry out during the dress powder, the jolt ramming while pack into, and the processing under 13T magnetic field simultaneously, sleeve pipe are sealed with 4 welding of steel plug at two ends about in the of 6; Sleeve pipe 6 is placed on the round plastic plate firm banking 8, its thickness is 10mm, base places on the level ground, on base, place circular dynamite container, on sleeve pipe 6 upper end plugs, put again and can load and unload briquetting 3, the explosive of in dynamite container, evenly packing into then, explosive is an ammonium nitrate base explosive, its density is 1.2g/cm
3, the thickness of the explosive of packing into is 65mm.Ignite by promptly putting detonator at the fuzing system, armament 1 at place, pinnacle, dynamite container top.Shock wave that blast is produced and high pressure make the magnetic powder compacting and bond together, and the explosive forming base is solidified 1.5h down at 150 ℃, generate the nano crystal double phase anisotropic neodymium iron boron binding magnet of the high magnetic performance of high density.The density of the bonded permanent magnet that makes is 7.12g/cm
3, remanent magnetism Br=0.839T (tesla), HCJ jHc=767KA/m, maximum magnetic energy product (BH) max=120KJ/m
3, the squareness of curve is 49%.
Claims (2)
1. the forming method of a nano crystal double phase anisotropic neodymium iron boron binding magnet the method is characterized in that to have following processing step:
A. the isotropic neodymium iron boron Magnaglo of nanocrystalline two-phase is evenly mixed with 0.05～1.5wt% binding agent, pack into subsequently in the steel sleeve pipe (6), slowly carry out during the dress powder, the jolt ramming while pack into, and through the processing in 1.0～1.5T magnetic field, powder is filled rear sleeve (6) and is sealed with steel plug (4) welding at two ends up and down simultaneously;
B. sleeve pipe (6) is placed on the round plastic plate firm banking (8), base places on the level ground, on base, place circular dynamite container, on the plug of sleeve pipe (6) upper end, put again and can load and unload briquetting (3), the ammonium nitrate base explosive of evenly packing in dynamite container then, explosive density is 0.75～1.30g/cm
3, the thickness of the explosive of packing into is 25～70mm;
C. by igniting at the fuzing system, armament (1) at place, pinnacle, dynamite container top, shock wave that blast is produced and high pressure make the magnetic powder compacting and bond together, the explosive forming base is solidified 1～2h down at 130～180 ℃, generate the nano crystal double phase anisotropic neodymium iron boron binding magnet of the high magnetic performance of high density.
2. the forming method of nano crystal double phase anisotropic neodymium iron boron binding magnet as claimed in claim 1 is characterized in that described binding agent is a resinoid bond.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101119339A CN100400205C (en) | 2005-12-23 | 2005-12-23 | Method for forming nano crystal double phase anisotropic neodymium iron boron binding magnet and apparatus thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005101119339A CN100400205C (en) | 2005-12-23 | 2005-12-23 | Method for forming nano crystal double phase anisotropic neodymium iron boron binding magnet and apparatus thereof |
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| Publication Number | Publication Date |
|---|---|
| CN1792512A CN1792512A (en) | 2006-06-28 |
| CN100400205C true CN100400205C (en) | 2008-07-09 |
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|---|---|---|---|
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385869A (en) * | 2002-05-30 | 2002-12-18 | 燕山大学 | Method for preparing alpha-Fe/Nd2 Fe14B anisotropy compound nano crystal permanent magnetic material |
| US20040079445A1 (en) * | 2002-10-24 | 2004-04-29 | Zhongmin Chen | High performance magnetic materials with low flux-aging loss |
| JP2005344142A (en) * | 2004-06-01 | 2005-12-15 | Matsushita Electric Ind Co Ltd | Method for producing radial anisotropic ring magnet |
| CN1753111A (en) * | 2005-10-27 | 2006-03-29 | 上海大学 | Shaping method of nano-crystal neodymium iron boron magnetic body and apparatus thereof |
| CN1792511A (en) * | 2005-12-23 | 2006-06-28 | 上海大学 | Method for forming anisotropic neodymium iron boron binding magnet and apparatus thereof |
-
2005
- 2005-12-23 CN CNB2005101119339A patent/CN100400205C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1385869A (en) * | 2002-05-30 | 2002-12-18 | 燕山大学 | Method for preparing alpha-Fe/Nd2 Fe14B anisotropy compound nano crystal permanent magnetic material |
| US20040079445A1 (en) * | 2002-10-24 | 2004-04-29 | Zhongmin Chen | High performance magnetic materials with low flux-aging loss |
| JP2005344142A (en) * | 2004-06-01 | 2005-12-15 | Matsushita Electric Ind Co Ltd | Method for producing radial anisotropic ring magnet |
| CN1753111A (en) * | 2005-10-27 | 2006-03-29 | 上海大学 | Shaping method of nano-crystal neodymium iron boron magnetic body and apparatus thereof |
| CN1792511A (en) * | 2005-12-23 | 2006-06-28 | 上海大学 | Method for forming anisotropic neodymium iron boron binding magnet and apparatus thereof |
Non-Patent Citations (4)
| Title |
|---|
| 快淬钕铁硼永磁合金及粘结磁体. 敖琪，刘薇，吴建生.稀有金属材料与工程，第34卷第10期. 2005 |
| 快淬钕铁硼永磁合金及粘结磁体. 敖琪，刘薇，吴建生.稀有金属材料与工程，第34卷第10期. 2005 * |
| 爆炸压制快淬NdFeB磁体的性能研究. 曹力军，杨远刚，曾振鹏，吴建生，李同春.实验室研究与探索，第21卷第4期. 2002 |
| 爆炸压制快淬NdFeB磁体的性能研究. 曹力军，杨远刚，曾振鹏，吴建生，李同春.实验室研究与探索，第21卷第4期. 2002 * |
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| Publication number | Publication date |
|---|---|
| CN1792512A (en) | 2006-06-28 |
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