CN100389913C - Method for forming nano crystal neodymium iron boron binding magnet - Google Patents
Method for forming nano crystal neodymium iron boron binding magnet Download PDFInfo
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- CN100389913C CN100389913C CNB2005101119254A CN200510111925A CN100389913C CN 100389913 C CN100389913 C CN 100389913C CN B2005101119254 A CNB2005101119254 A CN B2005101119254A CN 200510111925 A CN200510111925 A CN 200510111925A CN 100389913 C CN100389913 C CN 100389913C
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- iron boron
- neodymium iron
- nano
- crystal neodymium
- magnet
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Abstract
The present invention relates to a method for forming a nanometer crystal neodymium iron boron binding magnet. The present invention is characterized in that an isostatic pressing forming method is adopted. 0.2 to 1.0 wt% of adhesive is evenly mixed with nanometer crystal neodymium iron boron magnet powder. Then the mixture is packed in a rubber casing pipe. The mixture is solidified at the temperature of 130 to 200 DEG C after isostatic pressing processing with the pressure of 500 to 800Mpa to generate the nanometer crystal neodymium iron boron magnet with high density and high magnetism performance. The adding quantity of the adhesive of the method of the present invention is much less than that of a conventional press-forming method. The magnetism performance of the nanometer crystal neodymium iron boron magnet such as the maximum magnetic energy product, remanence, intrinsic coercive force, etc. can be enhanced by using the method of the present invention.
Description
Technical field
The present invention relates to a kind of forming method of nano crystal neodymium iron boron binding magnet, belong to metal dust extrusion forming technology field.
Background technology
Nanocrystalline two-phase neodymium iron boron is by the soft magnetism phase a-Fe with nanocrystalline grain size and Hard Magnetic Nd mutually
2Fe
14B forms.When the crystallite dimension of two-phase during in several to dozens of nanometers, between particle strong exchange-coupling interaction will take place and cause remanent magnetism to strengthen, this nano composite material of forming with " coupling of exchange elasticity " is the new way that obtains high energy product, and theory estimates that its maximum magnetic energy product can be up to 1MJ/m
3,, be applied to auto industry, small-sized and large-scale instrument or device, sound equipment, mobile phone, earphone, CD drive etc. widely far above the highest Sintered NdFeB magnet of present magnetic energy product.Nanocrystalline composite permanent-magnet material comprises a lot of systems, and Hard Magnetic can be Nd mutually
2Fe
14B, Sm
2Fe
17N
x, SmCo
5Or ferrite etc., soft magnetism can be α-Fe, Fe mutually
3B, FeCo alloy etc.The preparation method of nanocrystalline magnetic is also more, and quick quenching technique, mechanical alloying method, HDDR and thin film technique etc. are arranged.
The binding agent of nanocrystalline two-phase neodymium iron boron powder and 2～5% is mixed, at the certain pressure compacted under, can produce various cementing nanocrystalline magnetic Nd-Fe-B rings, magnetic shoe sheet etc., have excellent performance and the good cost performance that gets of getting, its purposes is very extensive, as the voice coil motor of computer hard disc driver, 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.Can be fine must satisfy magnetic material and device gets miniaturization, intellectuality and high performance, therefore, wait until extensive must the use at information, automobile, sound system.
The moulding process of existing nano-crystal neodymium iron boron magnetic body has three kinds of methods, i.e. compression moulding, injection moulding, extrusion modling.Need be with more binding agent when they exist a common problem to be moulding, and the magnet density that moulding makes is less, and the magnetic property of bonded permanent magnet is relatively poor.When adopting compression moulding, typical moulding process is as follows: with Nd
8.5(FeCoZr)
84.5Cr
0.5B
6.5Be example, the method by fast melt-quenching prepares amorphous ribbon, crystallization handle obtain nanocrystalline; Manocrystalline powders and binding agent mixed (the manocrystalline powders particle size range is 80～200 orders, binding agent is a resinoid bond, addition is 2～5wt%), (be pressed under 200～400Mpa) at certain pressure, solidified one hour down at 150 ℃ then, obtain nanocrystalline bonded permanent magnet at last.Owing to when granulation, added more nonmagnetic resinoid bond 2.9wt% in this technology, simultaneously, the method for compression molding because of the restriction of mould strength has limited pressure can not be too high, the density that makes magnet is lower, poor-performing.Its various performance parameters is: the density of bonded permanent magnet is 6.037g/cm
3, remanent magnetism Br=5.96T (tesla), HCJ jHc=610KA/m, (BH) max=58.02KJ/m is amassed in maximum energy storage
3, the squareness of curve is 25%.
Summary of the invention
The forming method that the purpose of this invention is to provide a kind of nano crystal neodymium iron boron binding magnet.Another object of the present invention is to improve the density and the magnetic performance of nano crystal neodymium iron boron binding magnet.
The objective of the invention is to implement by following technical proposals.
A kind of forming method of nano crystal neodymium iron boron binding magnet the method is characterized in that to have following processing step:
A. the neodymium iron boron raw material is obtained the amorphous magnet by the fast melt-quenching method, handle obtaining the nano-crystal neodymium iron boron magnetic body powder through crystallization;
B. with above-mentioned nano-crystal neodymium iron boron magnetic body powder and 0.2～1.0wt% binding agent evenly mix the neodymium iron boron mixture, Nano crystal neodymium, boron powder size scope is 80～200 orders;
C. said mixture is contained in the gum sleeve, at room temperature handle 0.5～2min through the static pressure that waits of 500～800Mpa pressure, in gum sleeve, take out mixture, solidify 1～2h down at 130～200 ℃ then, can obtain the nano-crystal neodymium iron boron magnetic body of the high magnetic performance of high density.
Nano-crystal neodymium iron boron magnetic body powder of the present invention also can make like this: prepare burden with the stoichiometry prescription that NdFeB requires, make alloy cast ingot by vacuum induction melting method, obtain the amorphous magnet through the fast melt-quenching method, handle obtaining the nano-crystal neodymium iron boron magnetic body powder again through crystallization.
Characteristics of the present invention are with the Nd to preparing with quick quenching technique
2Fe
14The nanocrystalline two-phase powder of B/ α-Fe carries out isostatic compaction.Because fluid pressure is very even in all directions during isostatic compaction, it is very fine and close to generate nano-crystal neodymium iron boron magnetic body, and density is even, and therefore, method of the present invention has improved nano-crystal neodymium iron boron magnetic body density and magnetic performance.The addition that another characteristics of the present invention are binding agents is 0.2～1.0wt%, far below the addition (2～5wt%) of conventional briquetting process binding agent.Compare with the prepared magnet of the briquetting process of routine with the prepared nano-crystal neodymium iron boron magnetic body of the inventive method, can improve the squareness of density, maximum magnetic energy product, remanent magnetism Br, HCJ and the curve of magnet.
The specific embodiment
After now embodiments of the invention specifically being described in.
Embodiment 1
In the present embodiment with Nd
8.5(FeCoZr)
84.5Cr
0.5B
6.5The basis of stoichiometry prescription is ready to raw material, obtains the amorphous magnet by the fast melt-quenching method, handles obtaining the nano-crystal neodymium iron boron magnetic body powder through crystallization; With above-mentioned nano-crystal neodymium iron boron magnetic body powder and 0.5wt% binding agent evenly mix the neodymium iron boron mixture, Nano crystal neodymium, boron powder size scope is 100 orders.Said mixture is contained in the gum sleeve, at room temperature handles 1min, in gum sleeve, take out mixture, solidify 1h down at 150 ℃ then, can obtain the nano-crystal neodymium iron boron magnetic body of the high magnetic performance of high density through the static pressure that waits of 650Mpa pressure.
The density and the magnetic performance of the nano-crystal neodymium iron boron magnetic body that makes improve significantly.Its magnet density is by 6.037g/cm
3Be increased to 6.78g/cm
3, remanent magnetism Br is increased to 0.747T (tesla) by 5.96T (tesla), and HCJ jHe is increased to 712KA/m by original 610KA/m, and max is by original 58.02KJ/m for maximum magnetic energy product (BH)
3Be increased to 72KJ/m
3, the squareness of curve is increased to 30% by 25%.
Embodiment 2
In the present embodiment with Nd
8.5(FeCoZr)
84.5Cr
0.5B
6.5The basis of stoichiometry prescription is ready to raw material, obtains the amorphous magnet by the fast melt-quenching method, handles obtaining the nanocrystalline magnet powder through crystallization, and the granularity of powder is 120 orders; With above-mentioned nano-crystal neodymium iron boron magnetic body powder and 0.2wt% binding agent evenly mix the neodymium iron boron mixture; Said mixture is contained in the gum sleeve, at room temperature handles 1min, in gum sleeve, take out mixture, solidify 1.5h down at 160 ℃ then, can obtain the nano-crystal neodymium iron boron magnetic body of the high magnetic performance of high density through the static pressure that waits of 600Mpa pressure.The density and the magnetic performance of the nano-crystal neodymium iron boron magnetic body that makes improve significantly.Its magnet density is 6.56g/cm
3, remanent magnetism Br is 0.651T (tesla), and HCJ jHe is 632KA/m, and maximum magnetic energy product (BH) max is 69KJ/m
3, the squareness of curve is 29%.
Embodiment 3
In the present embodiment with Nd
8.5(FeCoZr)
84.5Cr
0.5B
6.5The basis of stoichiometry prescription is ready to raw material, obtains the amorphous magnet by the fast melt-quenching method, handles obtaining the nanocrystalline magnet powder through crystallization, and the granularity of powder is 140 orders; With above-mentioned nano-crystal neodymium iron boron magnetic body powder and 0.7wt% binding agent evenly mix the neodymium iron boron mixture; Said mixture is contained in the gum sleeve, at room temperature handles 1min, in gum sleeve, take out mixture, solidify 1h down at 180 ℃ then, can obtain the nano-crystal neodymium iron boron magnetic body of the high magnetic performance of high density through the static pressure that waits of 750Mpa pressure.The density and the magnetic performance of the nano-crystal neodymium iron boron magnetic body that makes improve significantly.Its magnet density is 7.10g/cm
3, remanent magnetism Br is 0.691T (tesla), and HCJ jHe is 640KA/m, and maximum magnetic energy product (BH) max is 75KJ/m
3, the squareness of curve is 33%.
Embodiment 4
In the present embodiment with Nd
8.5(FeCoZr)
84.5Cr
0.5B
6.5The basis of stoichiometry prescription is ready to raw material, obtains the amorphous magnet by the fast melt-quenching method, handles obtaining the nanocrystalline magnet powder through crystallization, and the granularity of powder is 160 orders; With above-mentioned nano-crystal neodymium iron boron magnetic body powder and 0.9wt% binding agent evenly mix the neodymium iron boron mixture; Said mixture is contained in the gum sleeve, at room temperature handles 1min, in gum sleeve, take out mixture, solidify 1h down at 170 ℃ then, can obtain the nano-crystal neodymium iron boron magnetic body of the high magnetic performance of high density through the static pressure that waits of 550Mpa pressure.The density and the magnetic performance of the nano-crystal neodymium iron boron magnetic body that makes improve significantly.Its magnet density is 6.53g/cm
3, remanent magnetism Br is 0.659T (tesla), and HCJ jHe is 629KA/m, and maximum magnetic energy product (BH) max is 68KJ/m
3, the squareness of curve is 27%.
Claims (4)
1.-plant the forming method of nano crystal neodymium iron boron binding magnet, the method is characterized in that to have following processing step:
A. the neodymium iron boron raw material is obtained the amorphous magnet by the fast melt-quenching method, handle obtaining the nano-crystal neodymium iron boron magnetic body powder through crystallization;
B. with above-mentioned nano-crystal neodymium iron boron magnetic body powder and 0.2～1.0wt% binding agent evenly mix the neodymium iron boron mixture, Nano crystal neodymium, boron powder size scope is 80～200 orders;
C. said mixture is contained in the gum sleeve, at room temperature handle 0.5～2min through the static pressure that waits of 500～800Mpa pressure, in gum sleeve, take out mixture, solidify 1～2h down at 130～200 ℃ then, can obtain the nano-crystal neodymium iron boron magnetic body of the high magnetic performance of high density.
2. the forming method of nano crystal neodymium iron boron binding magnet as claimed in claim 1 is characterized in that described Nano crystal neodymium, boron powder size scope is 120～160 orders.
3. the forming method of nano crystal neodymium iron boron binding magnet as claimed in claim 1 is characterized in that described binding agent is a resinoid bond.
4. the forming method of nano crystal neodymium iron boron binding magnet as claimed in claim 1 is characterized in that described pressure is 600～700Mpa.
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|---|---|---|---|
| CNB2005101119254A CN100389913C (en) | 2005-12-23 | 2005-12-23 | Method for forming nano crystal neodymium iron boron binding magnet |
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|---|---|---|---|
| CNB2005101119254A CN100389913C (en) | 2005-12-23 | 2005-12-23 | Method for forming nano crystal neodymium iron boron binding magnet |
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| CN100389913C true CN100389913C (en) | 2008-05-28 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101908396A (en) * | 2010-06-29 | 2010-12-08 | 上海大学 | Nanocrystal composite NdFeB permanent magnet alloy with higher temperature stability and preparation method thereof |
| CN102554254B (en) * | 2011-11-16 | 2013-07-10 | 华中科技大学 | Metal In (indium) filled MgO (magnesium oxide) nanotube, manufacturing method for same and application thereof |
| CN103632829B (en) * | 2012-08-20 | 2016-08-17 | 南通万宝实业有限公司 | Composite nanocrystalline neodymium iron boron magnetic stripe and manufacture method thereof |
| CN104361989B (en) * | 2014-12-03 | 2017-02-08 | 湖南航天磁电有限责任公司 | Method for manufacturing large-sized high-density bonded permanent magnet |
| CN115206666B (en) * | 2022-09-16 | 2022-12-13 | 成都图南电子有限公司 | High-density bonded rare earth permanent magnet and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033543A (en) * | 1987-12-16 | 1989-06-28 | 中国科学院三环新材料研究开发公司 | Quasi-isostatic pressure method for pressing nd-fe-b magnet |
| US20030201035A1 (en) * | 2002-04-29 | 2003-10-30 | Electron Energy Corporation | Modified sintered RE-Fe-B-type, rare earth permanent magnets with improved toughness |
| CN1645525A (en) * | 2005-01-20 | 2005-07-27 | 横店集团东磁有限公司 | Formula of compoiste adhering magnet |
-
2005
- 2005-12-23 CN CNB2005101119254A patent/CN100389913C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1033543A (en) * | 1987-12-16 | 1989-06-28 | 中国科学院三环新材料研究开发公司 | Quasi-isostatic pressure method for pressing nd-fe-b magnet |
| US20030201035A1 (en) * | 2002-04-29 | 2003-10-30 | Electron Energy Corporation | Modified sintered RE-Fe-B-type, rare earth permanent magnets with improved toughness |
| CN1645525A (en) * | 2005-01-20 | 2005-07-27 | 横店集团东磁有限公司 | Formula of compoiste adhering magnet |
Non-Patent Citations (6)
| Title |
|---|
| Magnetic characterization of melt spunnanocomposite Nd4Fe77.5B18.5 alloys. V.K.Sankaranarayanan，L.M.Hoa，A.C.Rastogi.Applied Surface Science,Vol.182 . 2001 |
| Magnetic characterization of melt spunnanocomposite Nd4Fe77.5B18.5 alloys. V.K.Sankaranarayanan，L.M.Hoa，A.C.Rastogi.Applied Surface Science,Vol.182 . 2001 * |
| 制备工艺对粘结NdFeB永磁体性能的影响. 沈文娟，王宝奇，王志刚，谷南驹，郭素珍.新技术新工艺，第9期. 2003 |
| 制备工艺对粘结NdFeB永磁体性能的影响. 沈文娟，王宝奇，王志刚，谷南驹，郭素珍.新技术新工艺，第9期. 2003 * |
| 模压成型工艺对粘结NdFeB磁性能的影响. 杨在志，任慧平.包头钢铁学院学报，第23卷第3期. 2004 |
| 模压成型工艺对粘结NdFeB磁性能的影响. 杨在志，任慧平.包头钢铁学院学报，第23卷第3期. 2004 * |
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