CN1035738A - Method for producing superhuge anisotropy rare earth permanent magnet - Google Patents
Method for producing superhuge anisotropy rare earth permanent magnet Download PDFInfo
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- CN1035738A CN1035738A CN88100009A CN88100009A CN1035738A CN 1035738 A CN1035738 A CN 1035738A CN 88100009 A CN88100009 A CN 88100009A CN 88100009 A CN88100009 A CN 88100009A CN 1035738 A CN1035738 A CN 1035738A
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- permanent magnet
- magnetic field
- earth permanent
- superhuge
- rare earth
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Abstract
The invention belongs to specific process with the superhuge anisotropy rare earth permanent magnet of powder metallurgical technique, the about 1kg of manufacturing weight.The present invention adopts soft mode high impulse magnetic field orientating, vacuumizes the back cold isostatic compaction, sintering, tempering heat treatment then.The present invention can increase substantially size, the weight of permanent magnet when obtaining close magnetic with prior art, thereby improves recovery rate and production efficiency, reduces oxidation, improves the consistency of magnet.
Description
The invention belongs to the method for making superhuge anisotropy rare earth permanent magnet with powder metallurgy process.
At present, making the technology of rare-earth permanent magnet both at home and abroad with powder metallurgy process, generally is to adopt the non-magnetic alloy mould, the permanent magnetic field orientating of direct current.The free space of installation electromagnetical iron that produces this magnetic field is less, and increase with magnetic field, electromagnet poles is apart from reducing, the magnet briquet of the mould of die mould and orientation compacting is also along with becoming narrower, generally need 12, the magnetic field of 000～15,000 Austria just can make the rare earth permanent magnet alloy powder end obtain better orientation.Therefore, use the magnet weight (comprising parallel pressure and vertical pressure) of permanent magnetic field orientating compression molding seldom to surpass 500 grams both at home and abroad.But along with developing rapidly of rare earth permanent magnet, many occasions need the uniform permanent magnet of bulk quality, and in the manufacturing of miniaturized component, often the scheme with the bulk cutting is the most suitable, both can reduce oxidation, improved the consistency of magnet again, this high-performance Ne-Fe-B rare-earth permanent magnet in very easily oxidation is particularly important in producing.But when the pressing orientating briquet is oversize, the alignment magnetic field step-down, magnetic property is step-down also, and powder flowbility is poor, and briquet density contrast everywhere is big, and cracking, lamination appear in final sintering.
The objective of the invention is to overcome the shortcoming of above-mentioned prior art, obtain a kind of bulk anisotropy permanent magnet method of making high conformity, and reduce oxidation.
The present invention places rare earth permanent-magnet powder among the soft mode, pulse highfield orientation, cold isostatic compaction, sintering, heat treatment.
High impulse alignment magnetic field of the present invention is a solenoidal field, adopts the capacitor discharge type pulser, and its stored energy capacitance is about 47.5KJ, voltage is adjustable, reaches as high as 5000V, and the solenoid useful space is φ 60 * 120～φ 100 * 150mm, producing magnetic field is 20,000～60,000 Austria.Place pulsed magnetic field through being orientated for several times soft mode, have in magnetic field certain gradient where magnetic be subjected to magneticaction and move, its as a result density increase, because generally be the central magnetic field height, magnetic field, two magnetic is low slightly, gradient direction points to the center, and the two ends powder is to the center impact extrusion, and the suitable briquet of its result is subjected to a two-way compression stress.Magnetic field orientating needs more than twice, to improve the degree of orientation.
Soft mode of the present invention is by having certain elasticity and flexible rubber, plastics and paper are made, and its size is pressed the magnetic patch final size and amplified, and its shrinkage generally will get 28～40% with to adorn powder density and isostatic pressure relevant.Magnetic will evenly be adorned real (can not be too tight) earlier in soft mode, membranous wall should have certain intensity to avoid being orientated explosion in the process that magnetizes, and treats that it is to vacuumize in the sealing shroud that orientation is finished the poly-bag of briquet inclosure afterwards, carries out isostatic cool pressing after the sealed knot.
Isostatic cool pressing technology of the present invention is: after the soft mode that finishes of orientation vacuumizes through sealing in pulsed magnetic field, place etc. in the static pressure cavity and impose 3～5T/cm
2Pressure, remove sealing shroud and take out the compacting briquet and do suitable shaping and just prepare sintering.
The main points of sintering process are: 400～500 ℃ of insulation half an hour, be warmed up to 700～800 ℃ with stove in vacuum heat treatment furnace, be incubated 0.5～1 hour, argon filling, 1050～1220 ℃ of sintering 1～2 hour.Because magnet volume is bigger, thereby programming rate can not be too fast when heating up, and can not go into stove by high temperature.The soaking zone that makes it fully venting and eliminating Volatile Elements gas at low temperature should be arranged.Cooling system after the sintering is slow cooling or the cold system of stove.Because if quench after the sintering, on the one hand can not through hardening, also there is the cracking may on the other hand.
Heat treatment after the briquet sintering is: briquet carries out timeliness heat treatment at last through being processed into fritter after, with the coercive force of raising magnet (
1Hc).The classification that its heat treating regime is looked rare-earth permanent magnet is different and different.
Below in conjunction with effect of the present invention embodiment is described.
Contain the Nd Fe B alloys of Al with vacuum induction furnace smelting, the heavy 4kg of ingot, the surplus Fe(percentage by weight of its chemical analysis 36Nd-1.0B-0.6Al-).Get material 1.2kg ingot bar, slightly broken with jaw crusher, impact in the flour mill being broken into-60 purpose powder, wear into the powder that particle mean size is 3～10 μ m through the vibration flour mill, with the soft mode of φ 58 * 120mm, dress powder 1kg, after evenly adorning in fact, seal soft mode, be placed on the impulse solenoid medium position.Discharge voltage is 2000～3000 volts, 40,000～60, is orientated twice in 000 magnetic field difficult to understand, softens mould in sealing shroud, vacuum-pumping and sealing.Cold isostatic compaction, pressure are 3～5T/cm
2Peel off soft mode, suitably promptly carry out sintering after the shaping.
Sintering schedule: heat up vacuum 400 ℃ * 0.5 hour, 800 ℃ * 0.5 hour, fill Ar, 1070 ℃ * 30 minutes, 1100 ℃ * 20 minutes, 1050 ℃ * 1 hour, with the boiler tube water-cooled, the heavy 0.94kg of the briquet of coming out of the stove, average diameter φ 45, long approximately 80mm, footpath 600 ℃ * 1 hour, temper, after the boiler tube cooling, cut φ 10 * 10mm sample from the end, do Magnetic Measurement, result such as table 1.
In order to contrast the performance of using same powder and same sintering schedule two kinds of magnets that only the oriented moulding mode is different, the special control sample of having done, its technology is: 1, vertical precompressed under the 5000Oe magnetic field, and then 5T/cm
2Deng static pressure, sinter the magnet of 41 * 20 * 12mm into.Through measuring its magnetic result such as table 1.Big magnet coercive force is low be when quenching cooling slow due to, the higher explanation orientation of its Br is successful.
Can find out that from table 1 the present invention is when obtaining close magnetic with prior art, its magnet size, weight can increase substantially, thereby can improve recovery rate and production efficiency, reduce oxidation, improve the magnet consistency.
Claims (4)
1, a kind of manufacture method of superhuge anisotropy rare earth permanent magnet, be with rare-earth permanent magnet through magnetic field orientating, isostatic compaction and heat treatment is characterized in that: magnetic is packed in the soft mode, place the solenoid high-intensity magnetic field to be orientated, sintering after vacuumizing.
2, manufacture method according to claim 1 is characterized in that: described alignment magnetic field is the high impulse solenoidal field, adopts the capacitor discharge type pulser.
3, manufacture method according to claim 1 is characterized in that: will be orientated good soft mode briquet and enclose in the sealing shroud and vacuumize, and carry out isostatic cool pressing.
4, manufacture method according to claim 1 is characterized in that: described sintering process in vacuum heat treatment furnace 400～500 ℃ the insulation 0.5～1 hour, with stove be warmed up to 700～800 ℃ the insulation 0.5～1 hour; Slowly cooling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100009 CN1006744B (en) | 1988-01-05 | 1988-01-05 | Method for producing superhuge anisotropy rare earth permanent magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 88100009 CN1006744B (en) | 1988-01-05 | 1988-01-05 | Method for producing superhuge anisotropy rare earth permanent magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1035738A true CN1035738A (en) | 1989-09-20 |
| CN1006744B CN1006744B (en) | 1990-02-07 |
Family
ID=4831116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 88100009 Expired CN1006744B (en) | 1988-01-05 | 1988-01-05 | Method for producing superhuge anisotropy rare earth permanent magnet |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1006744B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120507C (en) * | 1994-10-07 | 2003-09-03 | 住友特殊金属株式会社 | Method for producing R-Fe-B series permanent magnet |
| CN101619381B (en) * | 2009-07-30 | 2011-04-20 | 浙江升华强磁材料有限公司 | Tempering method for sintering Nd-Fe-B permanent magnet |
| CN102451909A (en) * | 2010-10-20 | 2012-05-16 | 宁波科宁达工业有限公司 | Method for sintering and tempering sintered neodymium-iron-boron permanent-magnet material |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101853725B (en) * | 2009-04-03 | 2012-04-25 | 中国科学院宁波材料技术与工程研究所 | Preparation method of sintered Nd-Fe-B permanent magnetic material |
-
1988
- 1988-01-05 CN CN 88100009 patent/CN1006744B/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1120507C (en) * | 1994-10-07 | 2003-09-03 | 住友特殊金属株式会社 | Method for producing R-Fe-B series permanent magnet |
| CN101619381B (en) * | 2009-07-30 | 2011-04-20 | 浙江升华强磁材料有限公司 | Tempering method for sintering Nd-Fe-B permanent magnet |
| CN102451909A (en) * | 2010-10-20 | 2012-05-16 | 宁波科宁达工业有限公司 | Method for sintering and tempering sintered neodymium-iron-boron permanent-magnet material |
| CN102451909B (en) * | 2010-10-20 | 2015-11-25 | 宁波科宁达工业有限公司 | A kind of sintering of sintered Nd-Fe-B permanent magnetic material and tempering method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1006744B (en) | 1990-02-07 |
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