CN1007673B - Nd fe b permanent magnet with high using temp. and process for producing thereof - Google Patents
Nd fe b permanent magnet with high using temp. and process for producing thereofInfo
- Publication number
- CN1007673B CN1007673B CN 88100843 CN88100843A CN1007673B CN 1007673 B CN1007673 B CN 1007673B CN 88100843 CN88100843 CN 88100843 CN 88100843 A CN88100843 A CN 88100843A CN 1007673 B CN1007673 B CN 1007673B
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- Prior art keywords
- hour
- insulations
- chilled
- room temperature
- permanent magnet
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Abstract
The present invention relates to a rare earth permanent magnet which can be used at 200 DEG C. Elements, such as Dy-[2]O-[3], Co, Al, Si, etc., are added, and a new heat treatment process is proposed. The magnetic energy product of a rare earth permanent magnet product is 200 kj/m (25 mgoe), and a temperature coefficient is-0.065 to 0.085%/ degree C. Compared with the prior art, the cost of raw materials is reduced for about 30 %.
Description
The present invention relates to a kind of low-temperature coefficient NdFeB permanent magnet and the production method thereof that can at high temperature use.
Rare-earth-iron-boron (RFeB) based permanent magnet has the excellent magnetism energy, yet because its temperature coefficient is big, and serviceability temperature is low, therefore, application is very limited.In order to enlarge range of application, many researchers both domestic and external have spent a lot of energy for this reason, they think to have only the coercive force that improves the NdFeB magnet, could improve serviceability temperature, Wang Jinghai etc. [high jHcNdFeB permanent-magnet alloy and thermal stability thereof, (the 6th national magnetics meeting paper summary collects in October, 1987, the 232-233 page or leaf)], be subjected to the influence of this thought in the NdFeB permanent-magnet alloy, to add Dy
2O
3To improve the coercive force jHc of magnet.The serviceability temperature of magnet is increased (≤180 ℃).But because the reversible temperature coefficient of the magnet that they obtain is still very big, close with pure NdFeB be not so prior art solves the thermal stability problems of NdFeB permanent magnetism.The Takunaga of Hitachi etc., " microstructure of R-Fe-B sintered magnet ", (international magnetics 1986 the 5th phases of meeting).Proposed the NdFeB permanent magnet of a kind of Co of containing, its composition is by weight percentage: Nd 32-32.4%, and Dy 7.4%, and Co 4.5%, and B 1.09%, and surplus is Fe.Its process system is: 1080 ℃ of sintering are after 1 hour, and 900 ℃ of insulations 1 hour are reduced to room temperature with 1.3 ℃/minute, carry out Ageing Treatment at 600 ℃ at last.This material reveals in 200 ℃ of air to be put, and irreversible loss is 5%.Its temperature coefficient presses Co, Dy addition and calculates still to-0.10%/℃.When Co content is increased to 7.5%, though temperature coefficient can reduce to-0.085%/℃, irreversible loss is up to 20% in the time of 200 ℃, therefore, along with the increase of Co content, though temperature coefficient has descended, serviceability temperature also reduces greatly.Though this result is better than the result who reported in the past but still does not solve the thermal stability problems of NdFeB permanent magnetism.Simultaneously, this material is because the adding of a large amount of heavy rare earth Dy increases substantially cost.Lost the NdFeB advantages of being cheap.
Author of the present invention has studied the NdFeCoAlB system with low-temperature coefficient in great detail, and having found to influence the not high main cause of magnet serviceability temperature is low Curie temperature phase (bcc phase and Nd(FeCo)
2Phase) therefore existence, has proposed the opinion different with above-mentioned document.
The present invention is by this new theoretical opinion, by adding Dy
2O
3, adjust the composition of NdFeCoAlB and adopt special system of heat treatment process, reach and produce a kind of have high serviceability temperature, low-temperature coefficient, the purpose of NdFeB permanent magnet cheaply.
Novel NdFeB permanent magnet provided by the invention, its composition is by weight percentage: Nd 30～36%, Dy
2O
33～6%, Co 8～16%, and B 0.9～1.1%, and Al 0.2～0.8%, and Si 0.05～0.2%, and surplus is Fe.
The inventor is through fully discovering, adopt composition of the present invention and technology after, be the low Curie temperature magnetic phase that exists in the alloy at the NdFeCoAlB of high Co, quantity reduces, Curie temperature improves, the irreversible loss of material diminishes, and is better than the result of above-mentioned document.
Because the present invention adopts Dy
2O
3Replace Dy to do to add element, therefore, the magnet cost obviously descends.
The amount of B element influences irreversible loss greatly.Al is favourable to improving coercive force.
Used boron is that boron content is 24% ferro-boron.
The present invention adopts powder metallurgical technique owing to implemented a kind of new heat treating regime, reached therefore that prior art fails to reach when improving serviceability temperature, the purpose that the reversible temperature coefficient of magnet is reduced.
Raw material are pressed afore mentioned rules scope proportioning, put into vaccum sensitive stove or vacuum arc furnace ignition, melting under argon shield, and the water jacketed copper crucible casting, alloy is ground to 3～5 μ m, vacuumize in the toluene medium.Powder is shaped under the pressure perpendicular to alignment magnetic field, then sintering 1 hour in 1080 ℃～1120 ℃ argon gas atmosphere.
Heat treating regime of the present invention is: the magnet behind the sintering is chilled to room temperature soon through 1050 ℃ of insulations 1 hour; 1000 ℃ of insulations 1 hour, be chilled to room temperature soon; 900 ℃ of insulations 1 hour, be chilled to room temperature soon; 800 ℃ of insulations 1 hour, be chilled to room temperature soon; 700 ℃ of insulations 1 hour, be chilled to room temperature soon; 600 ℃ of insulations 1 hour, be chilled to room temperature soon at last.
After above-mentioned magnet carries out machine work on demand and magnetizes, provide use.
The RFeB based permanent magnet that adopts composition provided by the invention and process system to produce, coercive force is greater than 1120KA/m(14KOe), 200 ℃ of serviceability temperatures are revealed in air and are put irreversible loss less than 10%(Pc=2), reversible temperature coefficient α in 20 ℃～200 ℃ scopes
Bd(Pc=2) be-0.065～-0.085%/℃, after 200 ℃ of thermal shocks, until 200 ℃, irreversible loss is less than 1%, and the material cost of magnet compared with prior art reduces about 30%.
Embodiment
Alloy component is pressed proportioning shown in the table 1, melting in the argon gas atmosphere in vaccum sensitive stove, water jacketed copper crucible casting, alloy is ground to 3～5 μ m in the toluene medium, vacuumize, powder is shaped under the pressure perpendicular to alignment magnetic field, then sintering 1 hour in 1100 ℃ of argon gas atmosphere.Magnet behind the sintering is chilled to room temperature soon through 1050 ℃ of insulations 1 hour; 1000 ℃ of insulations 1 hour, be chilled to room temperature soon; 900 ℃ of insulations 1 hour, be chilled to room temperature soon; 800 ℃ of insulations 1 hour, be chilled to room temperature soon; 700 ℃ of insulations 1 hour, be chilled to room temperature soon; 600 ℃ of insulations 1 hour, be chilled to room temperature soon at last.Cut out Φ 7.5 * 7.5 little garden posts from the product magnet and carry out magnetic property and temperature characteristic measuring, the magnetic property of magnet is as shown in table 2.
Above-mentioned magnet uses in motor, and is respond well.
Table 1
Composition Dy Co B Al Nd Fe
Weight wt% Dy
2O
34.5 11.2 1.01 0.5 32.5 surpluses
Table 2(L/D=1, Pc=2 magnetometer demagnetizing factor)
| Br | JHC | (BH)max | 200 ℃ of dew are put irreversible loss % | Reversible temperature coefficient α %/℃ (20～200 ℃) of open circuit remanent magnetism | |||
| T | KCs | KA/m | KOe | KJ/m | MCOe | ||
| 1.02 | 10.2 | 〉1200 | 〉15 | 200 | 25 | 4.5 | -0.065～-0.085 |
Claims (2)
1, a kind of NdFeB permanent magnet with the high serviceability temperature of low-temperature coefficient, it is characterized in that its composition is by weight percentage: Nd 30～36%, Dy
2O
33～6%, Co8～16%, B 0.9～1.1%, and Al 0.2～0.8%, and Si 0.05～0.2%, and surplus is an iron.
2, a kind of production method of rare-earth permanent magnet as claimed in claim 1 is characterized in that its Technology for Heating Processing is: the magnet behind the sintering, through 1050 ℃ of insulations 1 hour, be chilled to room temperature soon,, be chilled to room temperature soon 1000 ℃ of insulations 1 hour, 900 ℃ of insulations 1 hour, be chilled to room temperature soon,, be chilled to room temperature soon 800 ℃ of insulations 1 hour, 700 ℃ of insulations 1 hour, be chilled to room temperature soon, 600 ℃ of insulations 1 hour, be chilled to room temperature soon at last.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100843 CN1007673B (en) | 1988-02-10 | 1988-02-10 | Nd fe b permanent magnet with high using temp. and process for producing thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100843 CN1007673B (en) | 1988-02-10 | 1988-02-10 | Nd fe b permanent magnet with high using temp. and process for producing thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1035580A CN1035580A (en) | 1989-09-13 |
| CN1007673B true CN1007673B (en) | 1990-04-18 |
Family
ID=4831527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88100843 Expired CN1007673B (en) | 1988-02-10 | 1988-02-10 | Nd fe b permanent magnet with high using temp. and process for producing thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1007673B (en) |
-
1988
- 1988-02-10 CN CN 88100843 patent/CN1007673B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN1035580A (en) | 1989-09-13 |
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| PB01 | Publication | ||
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| GR02 | Examined patent application | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
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| C15 | Extension of patent right duration from 15 to 20 years for appl. with date before 31.12.1992 and still valid on 11.12.2001 (patent law change 1993) | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |