CN102623166B - Preparation method for high performance as cast condition neodymium iron boron magnet - Google Patents
Preparation method for high performance as cast condition neodymium iron boron magnet Download PDFInfo
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- CN102623166B CN102623166B CN2012101110955A CN201210111095A CN102623166B CN 102623166 B CN102623166 B CN 102623166B CN 2012101110955 A CN2012101110955 A CN 2012101110955A CN 201210111095 A CN201210111095 A CN 201210111095A CN 102623166 B CN102623166 B CN 102623166B
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- 229910001172 neodymium magnet Inorganic materials 0.000 title claims abstract description 31
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000005266 casting Methods 0.000 claims abstract description 53
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000005496 tempering Methods 0.000 claims description 32
- 238000002844 melting Methods 0.000 claims description 15
- 230000008018 melting Effects 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000000203 mixture Substances 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 7
- 239000002994 raw material Substances 0.000 claims description 7
- 238000007670 refining Methods 0.000 claims description 7
- 238000005303 weighing Methods 0.000 claims description 7
- 229910000859 α-Fe Inorganic materials 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052782 aluminium Inorganic materials 0.000 claims description 5
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 claims description 4
- 229910052692 Dysprosium Inorganic materials 0.000 claims description 3
- 229910052771 Terbium Inorganic materials 0.000 claims description 3
- 239000004411 aluminium Substances 0.000 claims description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 150000002910 rare earth metals Chemical class 0.000 claims description 3
- 229910052777 Praseodymium Inorganic materials 0.000 claims description 2
- 229910052733 gallium Inorganic materials 0.000 claims description 2
- 229910052735 hafnium Inorganic materials 0.000 claims description 2
- 229910052749 magnesium Inorganic materials 0.000 claims description 2
- 239000007769 metal material Substances 0.000 claims description 2
- 229910052759 nickel Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 238000012545 processing Methods 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 229910052718 tin Inorganic materials 0.000 claims description 2
- 229910052719 titanium Inorganic materials 0.000 claims description 2
- 229910052721 tungsten Inorganic materials 0.000 claims description 2
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 229910052725 zinc Inorganic materials 0.000 claims description 2
- 229910052726 zirconium Inorganic materials 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 abstract description 19
- 238000009826 distribution Methods 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 abstract description 2
- 239000000696 magnetic material Substances 0.000 abstract description 2
- 239000013078 crystal Substances 0.000 description 15
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 7
- 230000009977 dual effect Effects 0.000 description 6
- 238000004663 powder metallurgy Methods 0.000 description 6
- 238000011161 development Methods 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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Abstract
The invention relates to the technical field of permanent magnetic material preparation and in particular to a preparation method for a high performance as cast condition neodymium iron boron magnet. By means of the composite process combining technology of casting and large strain plastic deformation and the technology of double orientation, grain size is effectively refined, and grain boundary and grain orientation are controlled, so that the high performance neodymium iron boron magnet which is fine in grains, even in grain boundary phase distribution and complete in grain orientation is prepared, and good matching of high coercivity and high magnetic energy product is obtained.
Description
Technical field
The present invention relates to the permanent magnetic material preparing technical field, refer in particular to a kind of preparation method of high-performance as-cast neodymium-iron-boron magnet.
Background technology
Nd-Fe-Bo permanent magnet material is with its excellent magnetic property and high cost performance and be widely used in the fields such as communication, medical treatment, automobile, electronics, aviation; But the coercive force that it is lower and poor temperature stability and decay resistance seriously limit the expansion of its range of application, development along with science and technology, every field is more and more higher to the requirement of neodymium iron boron magnetic body combination property, and therefore, the neodymium iron boron magnetic body of exploitation high combination property becomes a kind of inexorable trend.
The magnetic property of Nd-Fe-Bo permanent magnet material is mainly derived from Nd
2Fe
14B Hard Magnetic phase, but also closely related with the heterogeneous microstructure of magnet, neodymium iron boron magnetic body is a kind of polycrystalline composite diphase material, usually by powder metallurgical technique, is made, its grain size, Grain-Boundary Phase distribution, grain orientation etc. have appreciable impact to magnetic property; Through years of researches and development, the magnetic property of neodymium iron boron magnetic body obtains very large development, and maximum magnetic energy product is up to 474 kJ/m
3, near 93% of theoretical value, but its coercivity value but can not get effective raising always; Although the magnetocrystalline anisotropy field of Hard Magnetic phase is higher, the coercive force of magnet is still very low, and this is mainly caused by its microstructure; At present, coercitive effective raising mainly realizes by the interpolation of heavy rare earth element Dy and Tb, but this has not only reduced its magnetic energy product, and increases cost; In addition, microstructure optimization especially grain refinement is also to improve coercitive important method, and coercive force reaches maximum when the crystallite dimension refinement reaches the single domain size; But traditional powder metallurgy preparation technology can not realize effective refinement of crystal grain, but also may introduce more oxygen content, destroy its grain boundary structure, this shows, the acquisition orientation is complete, crystal grain is tiny with the equally distributed microstructure of crystal boundary is the effective way that guarantees high energy product and high-coercive force.
For the problems referred to above, the present invention starts with from preparation technology, proposes the combination process that adopts casting, large strain plastic deformation technology to combine with dual orientation technology and prepares the method for high-performance neodymium-iron-boron magnet; Relatively traditional powder metallurgical technique, casting-large strain plastic deformation technical matters is simple, more effective crystal grain thinning, the homogenizing Grain-Boundary Phase, avoid the magnet oxidation, realizes that magnet is coercitive to significantly improve; On this basis, impose dual orientation technology and not only can make grain orientation complete, guarantee high magnetic energy product, and can further optimize grain boundary structure, improve coercive force, thereby realize the preparation of high-performance as-cast neodymium-iron-boron magnet.
Summary of the invention
The magnetic energy product of neodymium iron boron magnetic body is high, but its coercive force is low, and temperature stability is poor, this has seriously limited its application, for expanding its range of application, meet the demand of modern development in science and technology, must effectively improve its coercive force and temperature stability under guaranteeing than the prerequisite of high energy product; Under the condition that reduces the heavy rare earth element application, crystal grain thinning, homogenizing Grain-Boundary Phase are to improve its coercitive effective way, but the effective crystal grain thinning of traditional powder metallurgical technique, thereby cause coercive force to can not get effective raising.The objective of the invention is for solving top problem, a kind of preparation method of high-performance as-cast neodymium-iron-boron magnet is provided, the combination process that it combines with dual orientation technology by casting, large strain plastic deformation technology, effective crystal grain thinning yardstick, control grain boundary structure and grain orientation, thereby prepare the high-performance neodymium-iron-boron magnet that crystal grain is tiny, Grain-Boundary Phase is uniformly distributed, grain orientation is complete, obtain the matched well of high-coercive force and high energy product.
The technical scheme that the present invention addresses the above problem is: the combination process that adopts casting, large strain plastic deformation technology to combine with dual orientation technology prepares high-performance as-cast neodymium-iron-boron magnet, obtain tiny main phase grain, equally distributed Grain-Boundary Phase and be orientated complete crystal grain, and then improving its magnetic property.
a kind of preparation method of high-performance as-cast neodymium-iron-boron magnet, the step that comprises casting, the step of vacuum high-temperature tempering, the step of refinement ingot structure, ingot casting after thinning microstructure is carried out the step of thermal deformation regulation and control magnetic texture and the ingot casting after orientation carried out the vacuum and low temperature tempering improve the step of grain boundary structure, it is characterized in that: after the ingot casting to after thinning microstructure carries out the thermal deformation processing, the ingot casting of increase after to thermal deformation carries out the heat treated step of vacuum high-intensity magnetic field, further strengthen magnetic texture, make the complete as cast condition magnet of orientation, described high-intensity magnetic field heat treatment process parameter is: magnetic field intensity is 2-20T, heat treatment temperature is 500-900 ℃, heat treatment time is 1-4h.
The preparation method of described a kind of high-performance as-cast neodymium-iron-boron magnet, its concrete steps are:
1) according to each element raw material of magnet composition weighing, with its mixing;
2) mixed material is put into vacuum melting furnace and carried out melting, pour into a mould after refining, obtain ingot casting;
3) ingot casting is carried out the vacuum high-temperature tempering, eliminate α-Fe, the homogenizing tissue;
4), with the ingot casting after homogenizing plasticity and toughness metal jacket and preheating, then carry out back pressure-equal channel angular large plastometric set, the refinement ingot structure;
5) ingot casting after thinning microstructure is carried out thermal deformation, the regulation and control magnetic texture;
6) ingot casting after thermal deformation is carried out the heat treatment of vacuum high-intensity magnetic field, further strengthen magnetic texture, make the complete as cast condition magnet of orientation;
7) magnet after being orientated carries out the vacuum and low temperature tempering, improves grain boundary structure, obtains high performance magnet.
Described magnet is the Rare-Earth Content magnet, and the atomic percent of its composition is Nd
aR
bFe
100-a-b-c-dB
cM
d, 12≤a+b≤16,0.1≤b≤5 wherein, 5≤c≤6.5,0.1≤d≤4, R is one or more in Pr, Dy, Tb, Ho, Gd element, and M is one or more in Al, Cu, Ga, Mg, Zn, Sn, Si, Co, Ni, Nb, Zr, Ti, W, V, Hf element.
Described high tempering temperature is 1000-1050 ℃, and tempering time is 4-10h.
Described jacket is mild steel, fine copper or fine aluminium with the plasticity and toughness metal material, and preheat temperature is 450-700 ℃.
Described back pressure-equal channel angular large plastometric set technological parameter is: passage angle Φ is 110 °-135 °, and external angle Ψ is 10 °-45 °, and the extruding path is Bc, and extruding passage N is 1-10, and back pressure is 45-200MPa.
Described thermal deformation technique parameter is: temperature is 650-1000 ℃, and pressure is 50-300MPa.
Described low tempering temperatures is 480-650 ℃, and tempering time is 0.5-4h.
The invention has the advantages that: by casting-large strain plastic deformation technology, prepare magnet, effective refinement magnet crystal particle scale, improve the distribution of the rich rare-earth phase of crystal boundary, and can avoid the complicated technology such as powder process, overcome the shortcoming of the easy oxidation of preparation process, guarantee coercitive effective raising; Dual orientation technology can make grain orientation complete, further optimizes grain boundary structure, guarantees simultaneously high coercive force and high magnetic energy product, thereby realizes the preparation of the high-performance as-cast neodymium-iron-boron magnet of high-coercive force and high energy product matched well; Therefore, the present invention can prepare that the crystal grain that existing technique is difficult to obtain is tiny, Grain-Boundary Phase is uniformly distributed and the complete high-performance neodymium-iron-boron magnet of grain orientation, this has not only significantly improved the coercive force of magnet, and effectively guaranteed to obtain the magnetic energy product that it is high the good fit of high-coercive force and high energy product, thereby further expand its practical ranges, this technical process is simple, be suitable for large-scale batch production, therefore, by the present invention, can prepare high performance as-cast neodymium-iron-boron magnet.
Embodiment
In the present invention, high performance as-cast neodymium-iron-boron magnet is to be prepared from the combination process that dual orientation technology combines by casting, large strain plastic deformation technology.At first will become the mixed material of assignment system to carry out vacuum melting by magnet, pour into ingot casting, and adopt high tempering to carry out homogenizing to ingot casting and process, then the ingot casting after homogenizing is used plasticity and toughness metal jacket, preheating, and carry out back pressure-equal channel angular large plastometric set and obtain the tiny magnet of crystal grain, the magnet that crystal grain is tiny carries out thermal deformation and high-intensity magnetic field heat treatment and obtains complete magnetic aligning finally, then carries out lonneal; The neodymium iron boron magnetic body crystal grain that adopts the present invention to make is tiny, Grain-Boundary Phase is evenly distributed, grain orientation is complete, has realized the matched well of high-coercive force and high energy product, promotes and has expanded its application in practice.
Embodiment 1
1) according to magnet composition Nd
11Pr
5Fe
78.9B
5Nb
0.1Each element raw material of weighing, with its mixing;
2) mixed material is put into vacuum melting furnace and carried out melting, pour into a mould after refining, obtain ingot casting;
3) ingot casting is carried out the vacuum high-temperature tempering of 4h under 1050 ℃, eliminate α-Fe, the homogenizing tissue;
4) with the ingot casting after homogenizing with the metallic aluminium jacket and be preheating to 450 ℃, then with the Bc path, carry out 4 passage back pressure-equal channel angular large plastometric sets, passage angle Φ is 110 °, external angle Ψ is 10 °, back pressure is 45Mpa, the refinement ingot structure;
5) ingot casting after thinning microstructure is carried out thermal deformation under 650 ℃, pressure is 150MPa, the regulation and control magnetic texture;
6) ingot casting after thermal deformation is carried out 900 ℃ of vacuum heat under 2T magnetic field, the time is 4h, further strengthens magnetic texture, makes the complete as cast condition magnet of orientation;
7) magnet after being orientated carries out the vacuum and low temperature tempering, and temperature is 580 ℃, and tempering time is 0.5h, improves grain boundary structure, obtains high performance as cast condition magnet.
Adopting the coercive force of the neodymium iron boron magnetic body of the present invention's preparation is 1015KA/m, and the 890KA/m that obtains with prior powder metallurgy technique compares, and coercive force improves approximately 14%.
Embodiment 2
1) according to magnet composition Nd
11.9Tb
0.1Fe
81B
5.5Cu
1.5Ga
0.5Each element raw material of weighing, with its mixing;
2) mixed material is put into vacuum melting furnace and carried out melting, pour into a mould after refining, obtain ingot casting;
3) ingot casting is carried out the vacuum high-temperature tempering of 10h under 1000 ℃, eliminate α-Fe, the homogenizing tissue;
4) with the ingot casting after homogenizing with the metallic copper jacket and be preheating to 700 ℃, then with the Bc path, carry out 1 passage back pressure-equal channel angular large plastometric set, passage angle Φ is 135 °, external angle Ψ is 45 °, back pressure is 200Mpa, the refinement ingot structure;
5) ingot casting after thinning microstructure is carried out thermal deformation under 1000 ℃, pressure is 100MPa, the regulation and control magnetic texture;
6) ingot casting after thermal deformation is carried out 500 ℃ of vacuum heat under 10T magnetic field, the time is 2h, further strengthens magnetic texture, makes the complete as cast condition magnet of orientation;
7) magnet after being orientated carries out the vacuum and low temperature tempering, and temperature is 480 ℃, and tempering time is 4h, improves grain boundary structure, obtains high performance as cast condition magnet.
Adopting the coercive force of the neodymium iron boron magnetic body of the present invention's preparation is 523KA/m, and the 476KA/m that obtains with prior powder metallurgy technique compares, and coercive force improves approximately 10%.
Embodiment 3
1) according to magnet composition Nd
13Dy
1Fe
76Co
2.5B
6Al
1.5Each element raw material of weighing, with its mixing;
2) mixed material is put into vacuum melting furnace and carried out melting, pour into a mould after refining, obtain ingot casting;
3) ingot casting is carried out the vacuum high-temperature tempering of 8h under 1020 ℃, eliminate α-Fe, the homogenizing tissue;
4) with the ingot casting after homogenizing with the mild steel jacket and be preheating to 550 ℃, then with the Bc path, carry out 10 passage back pressure-equal channel angular large plastometric sets, passage angle Φ is 120 °, external angle Ψ is 30 °, back pressure is 150Mpa, the refinement ingot structure;
5) ingot casting after thinning microstructure is carried out thermal deformation under 850 ℃, pressure is 50MPa, the regulation and control magnetic texture;
6) ingot casting after thermal deformation is carried out 750 ℃ of vacuum heat under 20T magnetic field, the time is 1h, further strengthens magnetic texture, makes the complete as cast condition magnet of orientation;
7) magnet after being orientated carries out the vacuum and low temperature tempering, and temperature is 600 ℃, and tempering time is 2h, improves grain boundary structure, obtains high performance as cast condition magnet.
Adopting the coercive force of the neodymium iron boron magnetic body of the present invention's preparation is 1204KA/m, and the 1115KA/m that obtains with prior powder metallurgy technique compares, and coercive force improves approximately 8%.
Embodiment 4
1) according to magnet composition Nd
12Tb
0.5Ho
1Fe
77.7Ni
1B
5.8Sn
1Ti
0.5Zr
0.5Each element raw material of weighing, with its mixing;
2) mixed material is put into vacuum melting furnace and carried out melting, pour into a mould after refining, obtain ingot casting;
3) ingot casting is carried out the vacuum high-temperature tempering of 6h under 1030 ℃, eliminate α-Fe, the homogenizing tissue;
4) with the ingot casting after homogenizing with the metallic copper jacket and be preheating to 650 ℃, then with the Bc path, carry out 6 passage back pressure-equal channel angular large plastometric sets, passage angle Φ is 130 °, external angle Ψ is 20 °, back pressure is 100Mpa, the refinement ingot structure;
5) ingot casting after thinning microstructure is carried out thermal deformation under 900 ℃, pressure is 200MPa, the regulation and control magnetic texture;
6) ingot casting after thermal deformation is carried out 650 ℃ of vacuum heat under 15T magnetic field, the time is 3h, further strengthens magnetic texture, makes the complete as cast condition magnet of orientation;
7) magnet after being orientated carries out the vacuum and low temperature tempering, and temperature is 550 ℃, and tempering time is 3h, improves grain boundary structure, obtains high performance as cast condition magnet.
Adopting the coercive force of the neodymium iron boron magnetic body of the present invention's preparation is 1022KA/m, and the 955KA/m that obtains with prior powder metallurgy technique compares, and coercive force improves approximately 7%.
Embodiment 5
1) according to magnet composition Nd
13Gd
2Fe
77B
6.5Zn
1W
0.5Each element raw material of weighing, with its mixing;
2) mixed material is put into vacuum melting furnace and carried out melting, pour into a mould after refining, obtain ingot casting;
3) ingot casting is carried out the vacuum high-temperature tempering of 5h under 1040 ℃, eliminate α-Fe, the homogenizing tissue;
4) with the ingot casting after homogenizing with the mild steel jacket and be preheating to 600 ℃, then with the Bc path, carry out 8 passage back pressure-equal channel angular large plastometric sets, passage angle Φ is 130 °, external angle Ψ is 40 °, back pressure is 80Mpa, the refinement ingot structure;
5) ingot casting after thinning microstructure is carried out thermal deformation under 700 ℃, pressure is 300MPa, the regulation and control magnetic texture;
6) ingot casting after thermal deformation is carried out 800 ℃ of vacuum heat under 8T magnetic field, the time is 2h, further strengthens magnetic texture, makes the complete as cast condition magnet of orientation;
7) magnet after being orientated carries out the vacuum and low temperature tempering, and temperature is 650 ℃, and tempering time is 1h, improves grain boundary structure, obtains high performance as cast condition magnet.
Adopting the coercive force of the neodymium iron boron magnetic body of the present invention's preparation is 1150KA/m, and the 1035KA/m that obtains with prior powder metallurgy technique compares, and coercive force improves approximately 11%.
Claims (4)
1. the preparation method of a high-performance as-cast neodymium-iron-boron magnet, the step that comprises casting, the step of vacuum high-temperature tempering, the step of refinement ingot structure, ingot casting after thinning microstructure is carried out the step of thermal deformation regulation and control magnetic texture and the ingot casting after orientation carried out the vacuum and low temperature tempering improve the step of grain boundary structure, it is characterized in that: after the ingot casting to after thinning microstructure carries out the thermal deformation processing, the ingot casting of increase after to thermal deformation carries out the heat treated step of vacuum high-intensity magnetic field, further strengthen magnetic texture, make the complete as cast condition magnet of orientation, described high-intensity magnetic field heat treatment process parameter is: magnetic field intensity is 2-20T, heat treatment temperature is 500-900 ℃, heat treatment time is 1-4h, its concrete steps are:
1) according to each element raw material of magnet composition weighing, with its mixing;
2) mixed material is put into vacuum melting furnace and carried out melting, pour into a mould after refining, obtain ingot casting;
3) ingot casting is carried out the vacuum high-temperature tempering, eliminate α-Fe, the homogenizing tissue;
4), with the ingot casting after homogenizing plasticity and toughness metal jacket and preheating, then carry out back pressure-equal channel angular large plastometric set, the refinement ingot structure;
5) ingot casting after thinning microstructure is carried out thermal deformation, the regulation and control magnetic texture;
6) ingot casting after thermal deformation is carried out the heat treatment of vacuum high-intensity magnetic field, further strengthen magnetic texture, make the complete as cast condition magnet of orientation;
7) magnet after being orientated carries out the vacuum and low temperature tempering, improves grain boundary structure, obtains high performance magnet;
Described jacket is mild steel, fine copper or fine aluminium with the plasticity and toughness metal material, and preheat temperature is 450-700 ℃; Described back pressure-equal channel angular large plastometric set technological parameter is: passage angle Φ is 110 °-135 °, and external angle Ψ is 10 °-45 °, and the extruding path is Bc, and extruding passage N is 1-10, and back pressure is 45-200MPa;
Described thermal deformation technique parameter is: temperature is 650-1000 ℃, and pressure is 50-300MPa.
2. the preparation method of a kind of high-performance as-cast neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: described magnet is the Rare-Earth Content magnet, the atomic percent of its composition is Nd
aR
bFe
100-a-b-c-dB
cM
d, 12≤a+b≤16,0.1≤b≤5 wherein, 5≤c≤6.5,0.1≤d≤4, R is one or more in Pr, Dy, Tb, Ho, Gd element, and M is one or more in Al, Cu, Ga, Mg, Zn, Sn, Si, Co, Ni, Nb, Zr, Ti, W, V, Hf element.
3. the preparation method of a kind of high-performance as-cast neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: described high tempering temperature is 1000-1050 ℃, tempering time is 4-10h.
4. the preparation method of a kind of high-performance as-cast neodymium-iron-boron magnet as claimed in claim 1, it is characterized in that: described low tempering temperatures is 480-650 ℃, tempering time is 0.5-4h.
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| CN104376944B (en) * | 2014-11-21 | 2017-02-22 | 北矿磁材科技股份有限公司 | Rare earth iron boron magnetic powder, rare earth iron boron magnet and preparation method of rare earth iron boron magnetic powder |
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| US4867809A (en) * | 1988-04-28 | 1989-09-19 | General Motors Corporation | Method for making flakes of RE-Fe-B type magnetically aligned material |
| CN1412328A (en) * | 2001-10-18 | 2003-04-23 | 山东中舜科技发展有限公司 | Production method of as-cast neodymium-iron-boron |
| CN1153232C (en) * | 2001-11-16 | 2004-06-09 | 清华大学 | Method for making rareearth permanent magnet material by discharge plasma sintering |
| CN100456395C (en) * | 2006-08-25 | 2009-01-28 | 浙江大学 | Preparation method of high corrosion resistance sintered neodymium iron boron |
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