CN102360909A - Preparation method for neodymium iron boron magnet - Google Patents
Preparation method for neodymium iron boron magnet Download PDFInfo
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Abstract
The invention provides a method for preparing a neodymium iron boron magnet with high coercive force by doping rare earth fluoride nanoparticles. The invention adopts the technical scheme that: the method for preparing the neodymium iron boron magnet comprises the following steps of: a, adding rare earth fluoride nano powder into neodymium iron boron raw material powder and mixing uniformly; b, orientating the powder which is mixed uniformly in a magnetic field and pressing to obtain pressed blanks; c, placing the pressed blanks into a vacuum sintering furnace and performing dehydrogenation and sintering treatment; and d, performing heat treatment. According to the treatment method, the rare earth fluoride nano powder is added into the mother powder during micronization, so that the neodymium iron boron magnetic material with excellent magnetic performance, particularly high coercive force, can be prepared. Compared with pure rare earth nanoparticles, the rare earth fluoride nano powder particles are difficult to oxidize, so the process operability is high. Compared with the magnet with the same performance, the neodymium iron boron magnet has the advantage that: the using amount of rare earth is small. Compared with single alloy with the same ingredient, the neodymium iron boron magnet has higher performance. The sintered magnet with high performance can be prepared by the traditional equipment.
Description
Technical field
The present invention relates to field of magnetic material, specifically is a kind of preparation method of neodymium iron boron magnetic body.
Background technology
Sintered NdFeB magnet is the strongest permanent magnetic material of magnetic up to now, and it is widely used in numerous areas such as electronics, electromechanics, instrument and medical treatment, is with fastest developing speed in the world today, the permanent magnetic material that market prospects are best.It is that temperature stability is poor that but there is a significant disadvantages in Sintered NdFeB magnet, thereby its application in fields such as high-temperature electric machines is greatly limited.The temperature stability of neodymium iron boron magnetic body and its coercive force are closely related, and improving the magnet coercive force is a kind of method of improving its temperature stability.The sintered Nd-Fe-B magnetic material of conventional art preparation is through in magnet, adding the coercive force that pure heavy rare earth nanometer powder improves magnet; But because oxidation very easily takes place in pure heavy rare earth nano-powder particles; The magnetic property final to magnet might produce deterioration; This just has higher requirement to magnet preparation technology and equipment, has therefore increased production cost greatly.
Summary of the invention
Main purpose of the present invention provides the particle doped preparation of a kind of rare-earth fluoride nano and has the preparation method of the neodymium iron boron magnetic body of high-coercive force.
In order to realize the foregoing invention purpose, the technical scheme that the present invention adopted is: a kind of preparation method of neodymium iron boron magnetic body may further comprise the steps:
A, at first the rare earth fluoride nanometer powder is joined in the neodymium iron boron material powder mix;
B, then will pass through even mixed powder in magnetic field, be orientated and compression moulding obtain pressed compact;
C, then pressed compact is inserted do dehydrogenation, sintering processes in the vacuum sintering furnace;
D, heat-treat at last.
According to processing method of the present invention, the present invention adopts the rare-earth fluoride nano powder particle when powder process, to be added in the material powder, prepares the particularly sintered Nd-Fe-B magnetic material of high-coercive force of excellent magnetic.Compare with pure rare earth nanometer particle, the nano-powder particles of rare earth element fluoride is difficult for oxidation, utilizes legacy equipment just can prepare high performance sintered magnet.
Embodiment
A kind of preparation method of neodymium iron boron magnetic body may further comprise the steps:
A, at first the rare earth fluoride nanometer powder is joined in the neodymium iron boron material powder mix, the rare earth fluoride nanometer powder can be the mixture of one or more different rare earth fluorides here; B, then will pass through even mixed powder in magnetic field, be orientated and compression moulding obtain pressed compact; C, then pressed compact is inserted do dehydrogenation, sintering processes in the vacuum sintering furnace; D, heat-treat at last.Replace the preparation of nanoparticles of pure heavy rare earth terbium or dysprosium to have the sintered Nd-Fe-B magnetic material of high-coercive force and excellent magnetic ability concurrently through the rare-earth fluoride nano powder particle.Compare with pure heavy rare earth nano-powder particles, the nano-powder particles of rare earth element fluoride is difficult for oxidation, and magnet is prepared the obviously reduction of oxygen content requirement in the process, utilizes legacy equipment just can prepare high performance sintered magnet.
Rare earth fluoride is to fluoridize in terbium, dysprosium fluoride, praseodymium fluoride, the neodymium fluoride one or more among the said step a.These several kinds of elements are comparatively commonly used, and effect is best.
Fluoridize terbium among the said step a or dysprosium fluoride nanometer powder particle diameter is 10～100 nanometers; Neodymium iron boron material powder particle diameter is 3～5 microns among the said step a.Such size is beneficial to fluoridizing terbium or the dysprosium fluoride nanometer powder evenly is entrained in the neodymium iron boron material powder.
The adding proportion of nanometer powder is 1～3% of neodymium iron boron material powder and a nanometer powder total weight among the said step a.Here only need the rare-earth fluoride nano powder of interpolation 1～3% just can play the coercitive effect of raising, the ratio of its addition terbium or the dysprosium also neodymium iron boron magnetic body of comparability conventional art sintering significantly reduces.
Magnetic field intensity is 1.5～2.5T among the said step b.Under the magnetic field environment of such intensity, the neodymium iron boron material powder of the rare-earth fluoride nano powder that mixed is closely arranged along the magnetic line of force, is beneficial to compression moulding.
Desorption temperature is 400～650 ℃ or 900～1000 ℃ among the said step c, and the time is 0.5～3 hour, and sintering temperature is 1050～1150 ℃, 2～4 hours time.Because the neodymium iron boron material powder is to obtain through neodymium iron boron rapid hardening thin slice is pulverized with the quick-fried method fragmentation of hydrogen and through airflow milling; The quick-fried method of hydrogen is that neodymium iron boron rapid hardening thin slice is inhaled hydrogen; The hydride lattice dilatation that generates; And generate heat, and the internal stress of expansion cracks rapid hardening thin slice crystal to become loose body, and lattice constant becomes big bursting simultaneously with thermal expansion process generation powder attitude and carries out.Hydrogen is all emitted in the said dehydrogenation processing back principal phase hydride of heating, and becomes original neodymium iron boron powder again.
Heat treatment comprises I and II in the said steps d, and wherein the one-level heat treatment temperature is 850～950 ℃, is incubated 1～3 hour; 500～650 ℃ of second level heat treatment temperatures are incubated 1～3 hour.Just obtained final Sintered NdFeB magnet through such processing.
Embodiment 1
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 3 microns of average grain diameters with composition, is that the terbium nanometer powder of fluoridizing of 10 nanometers is that 1% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 2.5T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 950 ℃ 2 hours is handled in temperature, is 1100 ℃ of following sintering 3 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 900 ℃, is incubated 2 hours; 600 ℃ of second level heat treatment temperatures are incubated 1 hour, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 1 of prepared magnet.
Comparative Examples 1
A, be that the alloy sheet of Nd29.7Tb1.0Fe67Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process thin slice to be processed the powder of 3 microns of average grain diameters with composition;
B, then powder is orientated in the magnetic field of 2.5T and compression moulding;
C, then pressed compact is inserted in the high vacuum sintering furnace, in 1100 ℃ of sintering 3 hours;
D, carry out secondary heat treatment at last: wherein first order heat treatment temperature is 900 ℃, is incubated 2 hours; 600 ℃ of second level heat treatment temperatures are incubated 1 hour, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 1 of prepared magnet.
It is to be noted; The composition Nd29.7Tb1.0Fe67Co1.2B1.1 of Comparative Examples 1 alloy (quality percentage composition) designs with proportioning according to the total composition after two kinds of powder among the embodiment 1, obtains to have the comparing result of two kinds of Sintered NdFeB magnets of identical component thus.
Table 1
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 1 | ?14.1 | 17.2 | 48.9 | 7.56 |
| Comparative Examples 1 | ?14.2 | 13.7 | 49.2 | 7.55 |
Above presentation of results adopts the present invention to add to fluoridize the magnet of terbium preparation to significantly improve than the coercive force that adopts traditional approach to add the magnet of terbium for the identical Sintered NdFeB magnet of composition, and the remanent magnetism of two kinds of magnets and magnetic energy product are suitable in addition.
Embodiment 2
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 5 microns of average grain diameters with composition, is that the dysprosium fluoride nanometer powder of 50 nanometers is that 3% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 1.5T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 1000 ℃ 0.5 hour is handled in temperature, is 1150 ℃ of following sintering 2 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 950 ℃, is incubated 1 hour; 650 ℃ of second level heat treatment temperatures are incubated 2 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 2 of prepared magnet.
Comparative Examples 2
A, be that the alloy sheet of Nd29Dy6Fe62.7C01.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process thin slice to be processed the powder of 5 microns of average grain diameters with composition;
B, then powder is orientated in the magnetic field of 2.5T and compression moulding;
C, then pressed compact is inserted in the high vacuum sintering furnace, in 1150 ℃ of sintering 2 hours;
D, carry out secondary heat treatment at last: wherein first order heat treatment temperature is 950 ℃, is incubated 1 hour; 650 ℃ of second level heat treatment temperatures are incubated 2 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 2 of prepared magnet.
Table 2
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 2 | 13.1 | 20.6 | 41.0 | 7.58 |
| Comparative Examples 2 | 12，.8 | 19.5 | 36.3 | 7.59 |
Above presentation of results adopts the inventive method and conventional method to prepare the close Sintered NdFeB magnet of coercive force, and there is very big-difference in the interpolation content of required dysprosium.Compare with conventional method, adopt nano particle adding method of the present invention obtaining the remarkable addition that reduces metal dysprosium of close coercitive while.In addition, owing to adopt the inventive method can reduce the addition of dysprosium, therefore the remanent magnetism of magnet and magnetic energy product also are significantly higher than the magnet of conventional method preparation.
Embodiment 3
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 4 microns of average grain diameters with composition, is that the dysprosium fluoride nanometer powder of 30 nanometers is that 2% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 2.0T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 950 ℃ 3 hours is handled in temperature, is 1050 times sintering 4 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 850 ℃, is incubated 3 hours; 550 ℃ of second level heat treatment temperatures are incubated 3 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 3 of prepared magnet.
Table 3
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) |
| Embodiment 3 | 13.7 | 17.9 | 46.2 | 7.58 |
Embodiment 4
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 4 microns of average grain diameters with composition, is that the dysprosium fluoride nanometer powder of 10 nanometers is that 1% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 2.5T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 900 ℃ 1 hour is handled in temperature, is 1100 times sintering 2 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 900 ℃, is incubated 2 hours; 500 ℃ of second level heat treatment temperatures are incubated 3 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 4 of prepared magnet.
Table 4
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 4 | ?14.2 | 15.1 | 51.6 | 7.56 |
Embodiment 5
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 4 microns of average grain diameters with composition, is that the praseodymium fluoride nanometer powder of 10 nanometers is that 1% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 1.8T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 400 ℃ 1 hour is handled in temperature, is 1100 times sintering 2 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 900 ℃, is incubated 2 hours; 500 ℃ of second level heat treatment temperatures are incubated 3 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 5 of prepared magnet.
Table 5
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 5 | ?14.1 | 15.6 | 50.0 | 7.54 |
Embodiment 6
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 4 microns of average grain diameters with composition, is that the neodymium fluoride nanometer powder of 20 nanometers is that 1% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 2.5T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 650 ℃ 2 hours is handled in temperature, is 1100 times sintering 3 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 900 ℃, is incubated 2 hours; 500 ℃ of second level heat treatment temperatures are incubated 3 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 6 of prepared magnet.
Table 6
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 6 | ?14.0 | 16.1 | 48.1 | 7.55 |
Embodiment 7
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 3 microns of average grain diameters with composition, is that dysprosium fluoride and the mixing nanometer powder of fluoridizing terbium of 30 nanometers is that 2% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 2.5T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 900 ℃ 1 hour is handled in temperature, is 1100 times sintering 2 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 900 ℃, is incubated 2 hours; 500 ℃ of second level heat treatment temperatures are incubated 3 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 7 of prepared magnet.
Table 7
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 7 | ?13.9 | 16.1 | 49.2 | 7.58 |
Embodiment 8
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 4 microns of average grain diameters with composition, is that the gadolinium fluoride nanometer powder of 40 nanometers is that 1% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 1.2T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 500 ℃ 2.5 hours is handled in temperature, is 1100 times sintering 2 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 900 ℃, is incubated 2 hours; 500 ℃ of second level heat treatment temperatures are incubated 3 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 8 of prepared magnet.
Table 8
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 8 | ?14.0 | 15.0 | 47.9 | 7.57 |
Embodiment 9
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 3 microns of average grain diameters with composition, is that the holmium fluoride nanometer powder of 25 nanometers is that 2% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 2.5T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 900 ℃ 1 hour is handled in temperature, is 1100 times sintering 2 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 900 ℃, is incubated 2 hours; 500 ℃ of second level heat treatment temperatures are incubated 3 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 9 of prepared magnet.
Table 9
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 9 | ?13.9 | 15.2 | 51.0 | 7.58 |
Embodiment 10
A, at first being that the neodymium iron boron thin slice of Nd29.5Fe68.2Co1.2B1.1 (quality percentage composition) adopts the quick-fried method fragmentation of hydrogen-airflow milling disintegrating process to process the material powder of 5 microns of average grain diameters with composition, is that the erbium nanometer powder of fluoridizing of 35 nanometers is that 2% ratio joins in the neodymium iron boron material powder and mixes according to mass ratio with particle diameter then;
B, then will pass through even mixed powder intensity be in the 2.5T magnetic field orientation and compression moulding obtain pressed compact;
C, then pressed compact being inserted in the vacuum sintering furnace, is that the dehydrogenation of carrying out under 900 ℃ 1 hour is handled in temperature, is 1100 times sintering 2 hours in temperature then;
D, carry out I and II heat treatment at last, wherein the one-level heat treatment temperature is 900 ℃, is incubated 2 hours; 500 ℃ of second level heat treatment temperatures are incubated 3 hours, promptly obtain sintered magnet.Described in each item magnetic property index and density such as table 10 of prepared magnet.
Table 10
| Remanent magnetism (kGS) | Coercive force (KOe) | Magnetic energy product (MGOe) | Density (g/cm) | |
| Embodiment 10 | ?13.9 | ?15.3 | 47.0 | 7.57 |
For saving space, only some rare earth fluorides of part or the mixture of rare earth fluoride are illustrated here.In sum, the present invention compares with the Sintered NdFeB magnet of the conventional art preparation that contains identical component (terbium, dysprosium etc.), has suitable remanent magnetism and the coercive force that significantly improves, and high slightly magnetic energy product; Compare with the Sintered NdFeB magnet with close coercitive conventional art preparation, then the quality percentage composition of terbium metal or dysprosium is obviously on the low side.Technology of preparing of the present invention is adopted in the The above results explanation, can effectively improve Sintered NdFeB magnet middle rare earth element and add efficient.In addition; Because technology of the present invention is when material powder process, to add the nano rare earth fluoride particles; Therefore can prepare the unrestricted magnet of overall dimension; And compare with pure rare earth nanometer particle, the nano-powder particles of rare earth element fluoride is difficult for oxidation, utilizes existing equipment just can prepare the high-performance magnet.
Claims (8)
1. the preparation method of a neodymium iron boron magnetic body may further comprise the steps:
A, at first the rare earth fluoride nanometer powder is joined in the neodymium iron boron material powder mix;
B, then will pass through even mixed powder in magnetic field, be orientated and compression moulding obtain pressed compact;
C, then pressed compact is inserted do dehydrogenation, sintering processes in the vacuum sintering furnace;
D, heat-treat at last.
2. the preparation method of a kind of neodymium iron boron magnetic body according to claim 1 is characterized in that: rare earth fluoride is to fluoridize in terbium, dysprosium fluoride, praseodymium fluoride, the neodymium fluoride one or more among the said step a.
3. the preparation method of a kind of neodymium iron boron magnetic body according to claim 1, it is characterized in that: rare earth fluoride nanometer powder particle diameter is 10～100 nanometers among the said step a; Neodymium iron boron material powder particle diameter is 3～5 microns among the said step a.
4. the preparation method of a kind of neodymium iron boron magnetic body according to claim 1, it is characterized in that: the adding proportion of nanometer powder is 1～3% of neodymium iron boron material powder and a nanometer powder total weight among the said step a.
5. the preparation method of a kind of neodymium iron boron magnetic body according to claim 1, it is characterized in that: magnetic field intensity is 1.5～2.5T among the said step b.
6. the preparation method of a kind of neodymium iron boron magnetic body according to claim 1, it is characterized in that: desorption temperature is 400～650 ℃ or 900～1000 ℃ among the said step c, and the time is 0.5～3 hour, and sintering temperature is 1050～1150 ℃, 2～4 hours time.
7. the preparation method of a kind of neodymium iron boron magnetic body according to claim 1, it is characterized in that: heat treatment comprises I and II in the said steps d, wherein the one-level heat treatment temperature is 850～950 ℃, is incubated 1～3 hour; 500～650 ℃ of second level heat treatment temperatures are incubated 1～3 hour.
8. the preparation method of a kind of neodymium iron boron magnetic body according to claim 1 is characterized in that: the neodymium iron boron material powder is through neodymium iron boron rapid hardening thin slice is broken and pulverize through airflow milling and to obtain with the quick-fried method of hydrogen among the said step a.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103212714A (en) * | 2013-04-27 | 2013-07-24 | 安徽大地熊新材料股份有限公司 | Method for preparing neodymium iron boron material |
| CN103506624A (en) * | 2012-06-20 | 2014-01-15 | 中磁科技股份有限公司 | Method for sintering neodymium iron boron magnets |
| CN103887054A (en) * | 2012-12-19 | 2014-06-25 | 中磁科技股份有限公司 | Preparation method of large-sized neodymium-iron-boron magnetic steel |
| CN103258634B (en) * | 2013-05-30 | 2015-11-25 | 烟台正海磁性材料股份有限公司 | One prepares high-performance R-Fe-B based sintered magnet method |
| CN107492429A (en) * | 2017-08-09 | 2017-12-19 | 江西金力永磁科技股份有限公司 | A kind of high temperature resistant neodymium iron boron magnetic body and preparation method thereof |
| CN115383122A (en) * | 2022-08-25 | 2022-11-25 | 太原科技大学 | Hydrogen crushing preparation method of 2 |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901658A (en) * | 2009-05-31 | 2010-12-01 | 株式会社日立制作所 | Sintered NdFeB rare-earth permanent magnet material with modified grain boundary phase and preparation method thereof |
| CN102021471A (en) * | 2009-09-17 | 2011-04-20 | 中国科学院宁波材料技术与工程研究所 | Preparation method for neodymium iron boron permanent magnet material |
-
2011
- 2011-06-16 CN CN201110161367.8A patent/CN102360909B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101901658A (en) * | 2009-05-31 | 2010-12-01 | 株式会社日立制作所 | Sintered NdFeB rare-earth permanent magnet material with modified grain boundary phase and preparation method thereof |
| CN102021471A (en) * | 2009-09-17 | 2011-04-20 | 中国科学院宁波材料技术与工程研究所 | Preparation method for neodymium iron boron permanent magnet material |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103506624A (en) * | 2012-06-20 | 2014-01-15 | 中磁科技股份有限公司 | Method for sintering neodymium iron boron magnets |
| CN103887054A (en) * | 2012-12-19 | 2014-06-25 | 中磁科技股份有限公司 | Preparation method of large-sized neodymium-iron-boron magnetic steel |
| CN103212714A (en) * | 2013-04-27 | 2013-07-24 | 安徽大地熊新材料股份有限公司 | Method for preparing neodymium iron boron material |
| CN103212714B (en) * | 2013-04-27 | 2015-04-22 | 安徽大地熊新材料股份有限公司 | Method for preparing neodymium iron boron material |
| CN103258634B (en) * | 2013-05-30 | 2015-11-25 | 烟台正海磁性材料股份有限公司 | One prepares high-performance R-Fe-B based sintered magnet method |
| CN107492429A (en) * | 2017-08-09 | 2017-12-19 | 江西金力永磁科技股份有限公司 | A kind of high temperature resistant neodymium iron boron magnetic body and preparation method thereof |
| CN115383122A (en) * | 2022-08-25 | 2022-11-25 | 太原科技大学 | Hydrogen crushing preparation method of 2 |
| CN115383122B (en) * | 2022-08-25 | 2023-07-14 | 太原科技大学 | Hydrogen crushing preparation method of 2:17 sintered samarium cobalt permanent magnet |
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