CN1632153A - High performance nano-crystal composite permanent magnetic alloy - Google Patents
High performance nano-crystal composite permanent magnetic alloy Download PDFInfo
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- CN1632153A CN1632153A CN 200410104243 CN200410104243A CN1632153A CN 1632153 A CN1632153 A CN 1632153A CN 200410104243 CN200410104243 CN 200410104243 CN 200410104243 A CN200410104243 A CN 200410104243A CN 1632153 A CN1632153 A CN 1632153A
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Abstract
The present invention relates to a high-performance nanocrystalline composite permanent magnetic alloy having the following alloying components (percent by weight): 6-11% of Nd, 9-15% of Pr, 2-4% of Co, 0.8-1.6% of B, 0.7-3% of Nb, with the reset being Fe; wherein the alloy microstructure consists of three phases such as 10-30% of soft-magnetic alpha-Fephase, 50-80% of permanent magnetism Nd2Fe14B and 10020% of residual amorphous phase. In accordance with the present invention, due to the existence of a definite residual amorphous phase between the soft and hard magnetic nanocrystallines, the boundary structure is improved, the remanence ratio of the alloy and the square figure degree of the magnetic hysteresis loop are improved; by regulating contents of Fe and Nd, nanocrystalline composite permanent magnetic alloys with high magnetic energy product and high coercive force can be respectively prepared. Said alloy can be used in fields of cementing magnetic bodies, micro special motors, personal computers, household electrical appliances, vehicles and the like.
Description
Technical field
The present invention relates to the alloy of black or non-ferrous metal, particularly relate to a kind of high performance nano-crystal composite permanent magnetic alloy.
Background technology
Permanent magnet material can be widely used in fields such as motor, generator, computer, automobile, magnetic suspension train, has important effect in the national economic development.Development in recent years get up by Hard Magnetic phase with nanoscale (as Nd
2Fe
14B) (the complex-phase nano crystal material of forming as α-Fe) is a class novel permanent magnetic material, and it has characteristics such as performance height, cost are low mutually with soft magnetism.Theoretical prophesy, the maximum magnetic energy product of this class complex-phase nano crystal permanent magnet material can surpass 50MGOe.Yet the maximum magnetic energy product of the complex-phase nano crystal permanent magnet material that present people are prepared is generally 15-20MGOe, and far below theory prophesy value, and coercivity is lower, H
Ci=(4-5.5) kOe.In order further to improve the magnetic energy product of complex-phase nano crystal permanent magnet material, people's research work mainly concentrates on the size aspect of optimizing its microstructure, particularly refinement nano-crystal soft-magnetic phase.Nearest result of study shows, α-Fe/Nd
2Fe
14The interface structure of B complex-phase nano crystal permanent magnet material contains the free volume of large-size, enrichment non-magnetic atom Nd and B around these free volumes.Obviously, that these free volumes will weaken will be soft, the coupling of Hard Magnetic nanometer intergranular magnetic exchange, reduce the magnetic energy product of alloy.Therefore, optimize the interface structure of complex-phase nano crystal permanent magnet material, will help to improve its magnetic energy product.
Summary of the invention
The object of the present invention is to provide a kind of high performance nano-crystal composite permanent magnetic alloy, its microstructure obviously is different from common complex-phase nano crystal permanent magnet material, and by soft magnetism α-Fe phase, permanent magnetism Nd
2Fe
14B and (10-20) remaining amorphous phase three phase composites of % intergranular.The maximum magnetic energy product of this permanent magnet alloy (BH)
Max=(18-25) MGOe, intrinsic coercivity H
Ci=(5.5-8.5) kOe, remanent magnetism B
r=(10-14) kG, Curie temperature T
c〉=610K.
The composition of nano-crystal composite permanent magnetic alloy provided by the invention (weight percentage) is: Nd 6-11%, and Pr 9-15%, Co 2-4%, B 0.8-1.6%, Nb 0.7-3%, all the other are Fe; The microstructure of alloy is by 10-30% soft magnetism α-Fe phase, 50-80% permanent magnetism Nd
2Fe
14Remaining amorphous phase three phase composites of B and 10-20%.
Its preparation method is: it is Nd that a. adopts vacuum arc furnace melting composition (atomic percent at.%)
xPr
yCo
zB
vFe
100-x-y-z-v(wherein: mother alloy 2.8＜x＜4.4,4.2＜y＜6.6,2＜z＜4,5＜v＜9), prepared mother alloy is put into silica tube, place the single roller melt of vacuum to get rid of the intravital high Frequency ruhmkorff coil in band machine chamber; B. the distance of silica tube bottom from copper roller surface is 8-10mm, feeds the pressure difference Δ p that argon gas is controlled in the gas storage pressure jar and got rid of band machine cavity; C. stage heating of Yong Gao Frequency ruhmkorff coil and fusing sample being on the 20-25m/s copper roller rotating with melt jet to linear velocity under the 0.06-0.09MPa pressure difference, can be prepared by 10-30% soft magnetism α-Fe phase, 50-80% permanent magnetism Nd
2Fe
14B and (10-20) nano-crystal composite permanent magnetic alloy formed of the remaining amorphous phase of %.
The invention has the beneficial effects as follows: the nano-crystal composite permanent magnetic alloy that adopts the present invention's preparation has improved interface structure owing to have certain remaining amorphous phase at soft, nanocrystalline of Hard Magnetic, has improved the remanence ratic of alloy and the squareness of magnetic hysteresis loop; By adjusting Fe, Nd content, the present invention can prepare the nano-crystal composite permanent magnetic alloy of high energy product and high coercivity respectively.
Description of drawings
The x x ray diffration pattern x of Fig. 1 high energy product nano-crystal composite permanent magnetic alloy;
The room temperature magnetic hysteresis loop of Fig. 2 high energy product nano-crystal composite permanent magnetic alloy;
The room temperature magnetic hysteresis loop of Fig. 3 high coercivity nano-crystal composite permanent magnetic alloy.
Embodiment
Embodiment 1 high energy product nano-crystal composite permanent magnetic alloy:
With the vacuum arc furnace melting composition is Nd
3Pr
5Fe
83Co
3B
5Nb
1Mother alloy.Prepared mother alloy is put into silica tube, place the single roller melt of vacuum to get rid of the intravital high Frequency ruhmkorff coil in band machine chamber.The distance of silica tube bottom from copper roller surface is 8mm.The pressure difference Δ p that is provided with in the gas storage pressure jar and gets rid of band machine cavity is 0.075MPa.Behind heating of Yong Gao Frequency ruhmkorff coil and the fusing sample, be on the 20m/s copper roller rotating to linear velocity with melt jet.Can prepare the α-Fe/Nd that contains 16% remaining amorphous phase
2Fe
14B nano-crystal composite permanent magnetic body (see figure 1), its maximum magnetic energy product (BH)
Max〉=23MGOe (see figure 2).
With the vacuum arc furnace melting composition is Nd
3.6Pr
5.4Fe
82Co
3B
5.5Nb
0.5Mother alloy.Prepared mother alloy is put into silica tube, place the single roller melt of vacuum to get rid of the intravital high Frequency ruhmkorff coil in band machine chamber.The distance of silica tube bottom from copper roller surface is 8.5mm.The pressure difference Δ p that is provided with in the gas storage pressure jar and gets rid of band machine cavity is 0.08MPa.Behind heating of Yong Gao Frequency ruhmkorff coil and the fusing sample, be on the 25m/s copper roller rotating to linear velocity with melt jet.Can prepare coercivity H
CiThe nano-crystal composite permanent magnetic alloy (see figure 3) of 〉=7kOe.
Claims (1)
1. high performance nano-crystal composite permanent magnetic alloy, it is characterized in that: the composition of nano-crystal composite permanent magnetic alloy is: Nd 6-11%, Pr 9-15%, Co 2-4%, B 0.8-1.6%, Nb 0.7-3%, all the other are Fe; The microstructure of alloy is by 10-30% soft magnetism α-Fe phase, 50-80% permanent magnetism Nd
2Fe
14Remaining amorphous phase three phase composites of B and 10-20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410104243 CN1632153A (en) | 2004-12-18 | 2004-12-18 | High performance nano-crystal composite permanent magnetic alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410104243 CN1632153A (en) | 2004-12-18 | 2004-12-18 | High performance nano-crystal composite permanent magnetic alloy |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1632153A true CN1632153A (en) | 2005-06-29 |
Family
ID=34848208
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200410104243 Pending CN1632153A (en) | 2004-12-18 | 2004-12-18 | High performance nano-crystal composite permanent magnetic alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304251A (en) * | 2014-06-05 | 2016-02-03 | 丰田自动车株式会社 | Nanocomposite magnet and method of producing the same |
-
2004
- 2004-12-18 CN CN 200410104243 patent/CN1632153A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105304251A (en) * | 2014-06-05 | 2016-02-03 | 丰田自动车株式会社 | Nanocomposite magnet and method of producing the same |
| CN105304251B (en) * | 2014-06-05 | 2017-10-10 | 丰田自动车株式会社 | Nanocomposite magnet and the method for preparing the Nanocomposite magnet |
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