CN103824668A - Low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet and production method thereof - Google Patents
Low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet and production method thereof Download PDFInfo
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Abstract
The invention relates to the technical field of rare earth neodymium-iron-boron permanent magnet material, in particular to a low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet and a production method thereof. Composition of the low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet is expressed as: Re Alpha Fe(100-Alpha-Beta-NuB Beta)MNu. The production method includes: mixing alloy powder and rare earth micro powder, pressing the mixture under the orientation field with intensity not smaller than 1.5T to obtain a blank; sintering at the temperature of 1050-1120 DEG C to obtain low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet. The rare earth neodymium-iron-boron permanent magnet material produced by the method and products of the material have well uniform properties, heavy rare earth consumption is low, and coercivity is high.
Description
Technical field
The present invention relates to a kind of rare-earth Nd-Fe-B permanent magnetic material technical field, be specifically related to a kind of low heavy rare earth high-coercive force Sintered NdFeB magnet and preparation method thereof.
Background technology
Rare-earth Nd-Fe-B permanent magnetic material is the third generation rare earth permanent magnet functional material of the invention early 1980s, its excellent magnetic property with high remanent magnetism, high-coercive force and high energy product is that other permanent magnetic material cannot replace, therefore be widely used in all fields of national economies such as the energy, traffic, machinery, electronics and become one of the important foundation material that supports contemporary electronics and information industry, guiding electronic product to energy-saving and environmental protection, efficient, light direction development.Even in the world also using the consumption per capita of rare-earth Nd-Fe-B permanent magnetic material as weighing one of important symbol of people of other countries' living standard and up-to-dateness.
In the prior art, be mainly to use heavy rare earth element Dy, Tb, Ho for obtaining high-coercive force, and the compound interpolation of the element such as other non-rare earth metal Nb, Cu, Al, Ga, Ti, V, Mn, Zn, Zr, W, Si, Sn, Cr, Mo.And heavy rare earth element Dy, Tb, Ho belong to scarce resource and cost is higher, are unfavorable for protecting effective utilization of non-renewable resources, also increase production cost simultaneously.Although the combination process that adopts low oxygen process, micro mist technique or hypoxemia to combine with micro mist fully demonstrates the magnetic property characteristic of material itself, also can play the object that reduces heavy rare earth element use amount, but for now, because being subject to many restrictions of process equipment in large-scale production process, in China still in test and exploratory stage.
As the patent No. Japan Patent that is 8510978, Japan Patent that the patent No. is 99801229.7 and the patent No. Japan Patent that is 200510084295.6 has all adopted the performance of adding heavy rare earth element Dy, Tb, Ho and obtain high-coercive force, this can not change the degree of dependence to heavy rare earth element Dy, Tb, Ho.
Summary of the invention
The present invention is directed to current rare-earth Nd-Fe-B permanent magnetic material high-coercive force to heavy rare earth element Dy, Tb, the present situation of the dependence of Ho, a kind of low heavy rare earth high-coercive force Sintered NdFeB magnet and preparation method thereof is provided, by using the effective phase of rare earth element powder to Fe-B rare-earth permanent magnet in production process---rich neodymium carries out effective compensation mutually to make up the loss of the rich neodymium phase of rare-earth Nd-Fe-B permanent magnet causing in process of production, thereby in preparation process, reduce the use amount of heavy rare earth element and obtain producing in batches low heavy rare earth high-coercive force Nd-Fe-B rare earth permanent magnetic material that performance consistency is good and products thereof.
In order to reach foregoing invention object, the present invention by the following technical solutions:
A kind of low heavy rare earth high-coercive force Sintered NdFeB magnet, its constituent is Re
αfe
100-alpha-beta-γb
βm
γ;
Re is rare earth element, comprise be selected from La, Ce, Pr, Nd, Pm, Sm, Eu,
gd,the element of one or more in Tb, Dy, Tb, Ho, Er, Tm, Yb, Lu, Y and Sc;
M is for adding element, comprise one or more the element being selected from Ti, V, Cr, Ni, Zn, Ga, Ge, Al, Zr, Nb, Co, Cu, Ag, Sn, W, Pb, Bi and Pd;
Fe is Fe and inevitable impurity;
α, β and γ are the atom percentage content of each element, wherein: 12≤α≤18,5.3≤β≤6.5,0.1≤γ≤8.
Technical scheme of the present invention is by using in process of production the effective phase of rare earth element powder to Fe-B rare-earth permanent magnet---rich neodymium carries out effective compensation mutually to make up the loss of the rich neodymium phase of rare-earth Nd-Fe-B permanent magnet causing in process of production, thereby in preparation process, reduces the use amount of heavy rare earth element and obtain producing in batches low heavy rare earth high-coercive force Nd-Fe-B rare earth permanent magnetic material that performance consistency is good and products thereof.
as preferred version, described rare earth element is one or more in La, Ce, Pr, Nd, Dy and Tb.
as preferred version, 15≤α≤18.
as preferred version, 5.8≤β≤6.2.
as preferred version, 2≤γ≤3.
A preparation method for low heavy rare earth high-coercive force Sintered NdFeB magnet, comprises the following steps:
1) adopt Mechanical Crushing or the quick-fried airflow milling mode that adds of hydrogen to carry out fragmentation to Nd-Fe-B rare earth permanent magnetic material alloy, make the Nd-Fe-B rare earth permanent magnetic material alloy powder of average grain diameter at 2.5-5.0 μ m;
2) rare earth element micro mist is obtained to the rare earth micro mist of average grain diameter at 1.5-3.6 μ m by all kinds of crushing process; The crushing process (as hydrogen fragmentation) that crushing process comprises Mechanical Crushing technique (as ball mill crushing, airflow milling fragmentation), physico-chemical process and machinery add physico-chemical process fragmentation (it is broken that fragmentation adds air-flow worn-off as hydrogen) etc.;
3) the above-mentioned rare earth micro mist making is joined in Nd-Fe-B rare earth permanent magnetic material alloy powder according to the percentage by weight of 0.3%-5%, mix;
4) by mixed alloy powder compressing blank in the alignment magnetic field of magnetic field intensity >=1.5T;
5) molded blank is put into vacuum sintering furnace and carried out high temperature sintering, 1050 ℃-1120 ℃ of sintering temperatures, sintering time 1.0-6.0 hour, and carry out temper, make low heavy rare earth high-coercive force Sintered NdFeB magnet.
as preferred version, described step 5) tempering process adopts 460 ℃ of-530 ℃ of constant temperature 2-5 hour.
as preferred version, described step 5) tempering process adopts double tempering, is specially first at 890 ℃ of-920 ℃ of constant temperature 1.5-3 hour then 480 ℃ of-520 ℃ of constant temperature 2-5 hour.
Nd Fe B alloys after moulding is blank will be by principal phase (Nd after above-mentioned technique
2fe
14b), the rich B phase (Nd of rich Nd phase, rare earth micro mist (one or more in La, Ce, Pr, Nd, Dy, Tb) and minute quantity
1.1fe
4b
4) composition, rare earth micro mist is present between the gap of principal phase particle.The fusing point of principal phase is about 1185 ℃, and rare earth micro mist generally just starts to dissolve in the time of 700 ℃ ~ 800 ℃, therefore under sintering temperature state Nd Fe B alloys system by the rich rare-earth phase (by rare earth micro mist and rich Nd phase composition) of solid-state principal phase and fusing, and rich rare-earth phase by liquid phase flow, molecular thermalmotion is penetrated into the gap between powder particle.When two powder particles exist in liquid phase simultaneously, and while having good wettability between liquid phase and solid phase particles, thereby two intergranular liquid phase surfaces produce a capillarity attraction to liquid phase curving, under the effect of this suction, even if drawing close mutually, two particles strengthen again the infiltration of liquid phase rare earth element to granule interior simultaneously, thereby form more complete rich rare-earth phase, compensation is in melting, powder process, the process loss of the rich rare-earth phase of NdFeB material in moulding and sintering process, from having improved in essence the anisotropy field of main phase grain superficial layer, cause the magnetic hardening in main phase grain boundary layer and improved the coercive force of material.
Compared with prior art, beneficial effect is in the present invention: prepare that Nd-Fe-B rare earth permanent magnetic material and products thereof consistency of performance is good, heavy rare earth consumption is low and have high-coercive force.Use this method in the preparation process of Sintered NdFeB magnet product, to replace heavy rare earth element by part light rare earth element; reduce the use amount of heavy rare earth element Dy and Tb; and the coercive force of resulting materials is also not less than the material of producing by other process; thereby itself is with regard to the use amount of more rare heavy rare earth element in minimizing rare earth element, effective utilization of protection non-renewable resources.
Embodiment
Below by specific embodiment, technical scheme of the present invention is further described to explanation.
If without specified otherwise, the raw material adopting in embodiments of the invention is the conventional raw material in this area, and the method adopting in embodiment is the conventional method of this area.
A kind of low heavy rare earth high-coercive force Sintered NdFeB magnet, its constituent is Re
αfe
100-alpha-beta-γb
βm
γ;
Re is rare earth element, comprise be selected from La, Ce, Pr, Nd, Pm, Sm, Eu,
gd,the element of one or more in Tb, Dy, Tb, Ho, Er, Tm, Yb, Lu, Y and Sc;
M is for adding element, comprise one or more the element being selected from Ti, V, Cr, Ni, Zn, Ga, Ge, Al, Zr, Nb, Co, Cu, Ag, Sn, W, Pb, Bi and Pd;
Fe is Fe and inevitable impurity;
α, β and γ are the atom percentage content of each element, wherein: 12≤α≤18,5.3≤β≤6.5,0.1≤γ≤8.
Described rare earth element is one or more in La, Ce, Pr, Nd, Dy and Tb.
15≤α≤18，?5.8≤β≤6.2，2≤γ≤3。
A preparation method for low heavy rare earth high-coercive force Sintered NdFeB magnet, comprises the following steps:
1) adopt Mechanical Crushing or the quick-fried airflow milling mode that adds of hydrogen to carry out fragmentation to Nd-Fe-B rare earth permanent magnetic material alloy, make the Nd-Fe-B rare earth permanent magnetic material alloy powder of average grain diameter at 2.5-5.0 μ m; Nd-Fe-B rare earth permanent magnetic material alloy, by mentioned component requirement, adopts casting technique or rapid hardening thin slice technique to make;
2) rare earth element micro mist is obtained to the rare earth micro mist of average grain diameter at 1.5-3.6 μ m by all kinds of crushing process;
3) the above-mentioned rare earth micro mist making is joined in Nd-Fe-B rare earth permanent magnetic material alloy powder according to the percentage by weight of 0.3%-5%, mix;
4) by mixed alloy powder compressing blank in the alignment magnetic field of magnetic field intensity >=1.5T;
5) molded blank is put into vacuum sintering furnace and carried out high temperature sintering, 1050 ℃-1120 ℃ of sintering temperatures, sintering time 1.0-6.0 hour, and carry out temper, make low heavy rare earth high-coercive force Sintered NdFeB magnet; Tempering process adopts a tempering: 460 ℃ of-530 ℃ of constant temperature 2-5 hour, or double tempering: first at 890 ℃ of-920 ℃ of constant temperature 1.5-3 hour, and then 480 ℃ of-520 ℃ of constant temperature 2-5 hour.
Scheme combination 1:
Be Nd by composition
10dy
2fe
more thanb
5.3m
0.1(at%) rare-earth Nd-Fe-B permanent magnetic material alloy, is prepared by technical scheme of the present invention: prepare burden and make Nd-Fe-Bo permanent magnet material alloy with rapid hardening thin slice technique by mentioned component; Adopt that hydrogen is broken to be added airflow milling mode rare-earth Nd-Fe-B permanent magnetic material alloy is carried out to fragmentation, make the alloy powder of average grain diameter at 2.5 μ m.
Break and add the rare earth element micro mist of air-flow grinding process acquisition average grain diameter at 1.5 μ m by hydrogen, the various rare earth element micro mists that make are added in Nd-Fe-B rare earth permanent magnetic material alloy powder by different percentage compositions in pulverizing process, and carry out batch mixing rare earth micro mist can be sneaked in Nd-Fe-B rare earth permanent magnetic material alloy powder uniformly; Mixed powder is compressing 41.5 × 50 × 42.3(mm in the alignment magnetic field of >=1.6T) square blank; Blank is put into high vacuum sintering furnace, 1100 ℃ of sintering 4.0 hours, 890 ℃ of one-level tempering 2 hours and 510 ℃ of second annealings 3.5 hours, make sintered magnet; Get Φ 10 × 10(mm) five of standard specimens carry out magnetism testing.
Scheme example 1: the interpolation percentage composition of rare earth element micro mist is 0%; The magnetic property testing result of gained sintered magnet: Hcj=27.73-28.26kOe.
Embodiment 2: the interpolation percentage composition of rare earth element micro mist is 0.3%, rare earth element used is Nd; The magnetic property testing result of gained sintered magnet: Hcj=27.86-28.50kOe; .
Embodiment 3: the interpolation percentage composition of rare earth neodymium micro mist is 1.0%, rare earth element used is Nd; The magnetic property testing result of gained sintered magnet: Hcj=28.81-29.49kOe.
Embodiment 4: the interpolation percentage composition of rare earth neodymium micro mist is 2.0%, rare earth element used is Nd; The magnetic property testing result of gained sintered magnet: Hcj=29.45-30.27kOe.
Embodiment 5: the interpolation percentage composition of rare earth neodymium micro mist is 3.0%, rare earth element used is Nd; The magnetic property testing result of gained sintered magnet: Hcj=30.05-31.49kOe.
Embodiment 6: the interpolation percentage composition of rare earth neodymium micro mist is 5.0%, rare earth element used is Nd; The magnetic property testing result of gained sintered magnet: Hcj=28.85-29.70kOe.
Comparative example 1: be Nd by composition
9.5dy
2.5fe
more thanb
5.3m
0.1(at%) rare-earth Nd-Fe-B permanent magnetic material alloy; Do not add rare earth micro mist and make the sample of same specification size by upper method, the magnetic property testing result of gained sintered magnet: Hcj=30.34-31.57.
The performance of embodiment 1-6 and comparative example 1 gathers in table 1;
Table 1
| Project | Adding proportion (%) | Add element | Add element ratio | Hcj(kOe) |
| Embodiment 1 | 0 | —— | —— | 27.73-28.26 |
| Embodiment 2 | 0.3 | Nd | 1 | 27.86-28.50 |
| Embodiment 3 | 1.0 | Nd | 1 | 28.81-29.49 |
| Embodiment 4 | 2.0 | Nd | 1 | 29.45-30.27 |
| Embodiment 5 | 3.0 | Nd | 1 | 30.05-31.49 |
| Embodiment 6 | 5.0 | Nd | 1 | 28.85-29.70 |
| Comparative example 1 | —— | —— | —— | 30.34-31.57 |
Scheme combination 2:
Be Nd by composition
17dy
1fe
more thanb
6.5m
8(at%) rare-earth Nd-Fe-B permanent magnetic material alloy, is wherein prepared by technical scheme of the present invention: prepare burden and make Nd-Fe-Bo permanent magnet material alloy with rapid hardening thin slice technique by mentioned component; Adopt that hydrogen is broken to be added airflow milling mode rare-earth Nd-Fe-B permanent magnetic material alloy is carried out to fragmentation, make the alloy powder of average grain diameter at 5.0 μ m.
Break and add the rare earth element micro mist of air-flow grinding process acquisition average grain diameter at 3.6 μ m by hydrogen, the various rare earth element micro mists that make are added in Nd-Fe-B rare earth permanent magnetic material powder by different percentage compositions in pulverizing process, and carry out batch mixing rare earth micro mist can be sneaked in Nd-Fe-B rare earth permanent magnetic material powder uniformly; Mixed powder is compressing 41.5 × 50 × 42.3(mm in the alignment magnetic field of >=2.0T) square blank; Blank is put into high vacuum sintering furnace, 1120 ℃ of sintering 6.0 hours, 480 ℃ of tempering 5 hours, make sintered magnet; Get Φ 10 × 10(mm) five of standard specimens carry out magnetism testing.
Embodiment 7: the interpolation percentage composition of rare earth element micro mist is 2.8%, rare earth element used is Pr, bis-kinds of admixed finepowders of Nd (mixed proportion is Pr:Nd=3:7); The magnetic property testing result of gained sintered magnet: Hcj=26.38-26.70kOe.
Embodiment 8: the interpolation percentage composition of rare earth element micro mist is 2.8%, rare earth element used is Ce, bis-kinds of admixed finepowders of Pr (mixed proportion is Ce:Pr=5:5); The magnetic property testing result of gained sintered magnet: Hcj=25.78-26.32kOe.
Embodiment 9: the interpolation percentage composition of rare earth element micro mist is 2.8%, rare earth element used is Ce, Pr, tri-kinds of admixed finepowders of Nd (mixed proportion is Ce:Pr:Nd=2:2:6); The magnetic property testing result of gained sintered magnet: Hcj=26.08-26.42kOe.
Embodiment 10: the interpolation percentage composition of rare earth element micro mist is 2.8%, rare earth element used is Pr, Nd, tri-kinds of admixed finepowders of Dy (mixed proportion is Pr:Nd:Dy=5:2:3); The magnetic property testing result of gained sintered magnet: Hcj=27.78-28.12kOe.
Embodiment 11: the interpolation percentage composition of rare earth element micro mist is 2.8%, rare earth element used is La, Pr, Nd, tetra-kinds of admixed finepowders of Tb (mixed proportion is La:Pr:Nd:Tb=5:2:2:1); The magnetic property testing result of gained sintered magnet: Hcj=26.30-26.74kOe.
Embodiment 12: the interpolation percentage composition of rare earth element micro mist is 2.8%, rare earth element used is La, Ce, Pr, tetra-kinds of admixed finepowders of Nd (mixed proportion is La:Ce:Pr:Nd=4:1:2:3); The magnetic property testing result of gained sintered magnet: Hcj=25.14-25.61kOe.
Comparative example 2: the interpolation percentage composition of rare earth element micro mist is 0%; The magnetic property testing result of gained sintered magnet: Hcj=22.80-23.26kOe.
The performance of embodiment 7-12 and comparative example 2 gathers in table 2;
Table 2
| Project | Adding proportion (%) | Add element | Add element ratio | Hcj(kOe) |
| Embodiment 7 | 2.8 | Pr：Nd | 3：7 | 26.38-26.70 |
| Embodiment 8 | 2.8 | Ce：Pr | 5：5 | 25.78-26.32 |
| Embodiment 9 | 2.8 | Ce：Pr：Nd | 2：2：6 | 26.08-26.42 |
| Embodiment 10 | 2.8 | Pr：Nd：Dy | 5：2：3 | 27.78-28.12 |
| Embodiment 11 | 2.8 | La ：Pr：Nd：Tb | 5：2：2：1 | 26.30-26.74 |
| Embodiment 12 | 2.8 | La：Ce：Pr：Nd | 4：1：2：3 | 25.14-25.61 |
| Comparative example 2 | —— | —— | —— | 22.80-23.26 |
Scheme combination 3:
Be Nd by composition
13.4dy
0.4fe
more thanb
5.8m
4(at%) rare-earth Nd-Fe-B permanent magnetic material alloy, is wherein prepared by technical scheme of the present invention: prepare burden and make Nd-Fe-Bo permanent magnet material alloy with rapid hardening thin slice technique by mentioned component; Adopt that hydrogen is broken to be added airflow milling mode rare-earth Nd-Fe-B permanent magnetic material alloy is carried out to fragmentation, make the alloy powder of average grain diameter at 3.2 μ m.
Break and add the rare earth element micro mist of air-flow grinding process acquisition average grain diameter at 2.5 μ m by hydrogen, the various rare earth element micro mists that make are added in Nd-Fe-B rare earth permanent magnetic material powder by different percentage compositions in pulverizing process, and carry out batch mixing rare earth micro mist can be sneaked in Nd-Fe-B rare earth permanent magnetic material powder uniformly; Mixed powder is compressing 41.5 × 50 × 42.3(mm in the alignment magnetic field of >=1.5T) square blank; Blank is put into high vacuum sintering furnace, 1080 ℃ of sintering 4.0 hours, 900 ℃ of one-level tempering 2.2 hours and 510 ℃ of second annealings 4.0 hours, make sintered magnet; Get Φ 10 × 10(mm) five of standard specimens carry out magnetism testing.
Embodiment 13: the interpolation percentage composition of rare earth element micro mist is 0%; The magnetic property testing result of gained sintered magnet: Hcj=18.32-18.85kOe.
Embodiment 14: the interpolation percentage composition of rare earth element micro mist is 0.5%, rare earth element used is Pr, bis-kinds of admixed finepowders of Nd (mixed proportion is Pr:Nd=4:6); The magnetic property testing result of gained sintered magnet: Hcj=18.88-19.30kOe.
Embodiment 15: the interpolation percentage composition of rare earth element micro mist is 1.0%, rare earth element used is Pr, bis-kinds of admixed finepowders of Nd (mixed proportion is Pr:Nd=4:6); The magnetic property testing result of gained sintered magnet: Hcj=19.38-19.70kOe.
Embodiment 16: the interpolation percentage composition of rare earth element micro mist is 1.5%, rare earth element used is Pr, bis-kinds of admixed finepowders of Nd (mixed proportion is Pr:Nd=4:6); The magnetic property testing result of gained sintered magnet: Hcj=19.90-20.43kOe.
Embodiment 17: the interpolation percentage composition of rare earth element micro mist is 2.0%, rare earth element used is Pr, bis-kinds of admixed finepowders of Nd (mixed proportion is Pr:Nd=4:6); The magnetic property testing result of gained sintered magnet: Hcj=20.40-20.86kOe.
Embodiment 18: the interpolation percentage composition of rare earth element micro mist is 2.5%, rare earth element used is Pr, bis-kinds of admixed finepowders of Nd (mixed proportion is Pr:Nd=4:6); The magnetic property testing result of gained sintered magnet: Hcj=21.02-21.44kOe.
Comparative example 3: be Nd by composition
13.2dy
0.8fe
more thanb
5.8m
3.58(at%) rare-earth Nd-Fe-B permanent magnetic material alloy; Do not add rare earth micro mist and make the sample of same specification size by upper method, the magnetic property testing result of gained sintered magnet: Hcj=21.22-21.57kOe.
The performance of embodiment 13-18 and comparative example 3 gathers in table 3;
Table 3
| Project | Adding proportion (%) | Add element | Add element ratio | Hcj(kOe) |
| Embodiment 13 | 0 | —— | —— | 18.32-18.85 |
| Embodiment 14 | 0.5 | Pr：Nd | 4：6 | 18.88-19.30 |
| Embodiment 15 | 1.0 | Pr：Nd | 4：6 | 19.38-19.70 |
| Embodiment 16 | 1.5 | Pr：Nd | 4：6 | 19.90-20.43 |
| Embodiment 17 | 2.0 | Pr：Nd | 4：6 | 20.40-20.86 |
| Embodiment 18 | 2.5 | Pr：Nd | 4：6 | 21.02-21.44 |
| Comparative example 3 | 0 | —— | —— | 21.22-21.57 |
Claims (8)
1. a low heavy rare earth high-coercive force Sintered NdFeB magnet, is characterized in that, its constituent is Re
αfe
100-alpha-beta-γ B βm
γ;
Re is rare earth element, comprise be selected from La, Ce, Pr, Nd, Pm, Sm, Eu,
gd,the element of one or more in Tb, Dy, Tb, Ho, Er, Tm, Yb, Lu, Y and Sc;
M is for adding element, comprise one or more the element being selected from Ti, V, Cr, Ni, Zn, Ga, Ge, Al, Zr, Nb, Co, Cu, Ag, Sn, W, Pb, Bi and Pd;
Fe is Fe and inevitable impurity;
α, β and γ are the atom percentage content of each element, wherein: 12≤α≤18,5.3≤β≤6.5,0.1≤γ≤8.
2. the low heavy rare earth high-coercive force of one according to claim 1 Sintered NdFeB magnet, is characterized in that, described rare earth element is one or more in La, Ce, Pr, Nd, Dy and Tb.
3. the low heavy rare earth high-coercive force of one according to claim 1 Sintered NdFeB magnet, is characterized in that 15≤α≤18.
4. the low heavy rare earth high-coercive force of one according to claim 1 Sintered NdFeB magnet, is characterized in that 5.8≤β≤6.2.
5. the low heavy rare earth high-coercive force of one according to claim 1 Sintered NdFeB magnet, is characterized in that 2≤γ≤3.
6. a method of preparing a kind of low heavy rare earth high-coercive force Sintered NdFeB magnet claimed in claim 1, is characterized in that, comprises the following steps:
1) adopt Mechanical Crushing or the quick-fried airflow milling mode that adds of hydrogen to carry out fragmentation to Nd-Fe-B rare earth permanent magnetic material alloy, make the Nd-Fe-B rare earth permanent magnetic material alloy powder of average grain diameter at 2.5-5.0 μ m;
2) rare earth element micro mist is obtained to the rare earth micro mist of average grain diameter at 1.5-3.6 μ m by all kinds of crushing process;
3) the above-mentioned rare earth micro mist making is joined in Nd-Fe-B rare earth permanent magnetic material alloy powder according to the percentage by weight of 0.3%-5%, mix;
4) by mixed alloy powder compressing blank in the alignment magnetic field of magnetic field intensity >=1.5T;
5) molded blank is put into vacuum sintering furnace and carried out high temperature sintering, 1050 ℃-1120 ℃ of sintering temperatures, sintering time 1.0-6.0 hour, and carry out temper, make low heavy rare earth high-coercive force Sintered NdFeB magnet.
7. a kind of method of effective compensation legal system for low heavy rare earth high-coercive force Sintered NdFeB magnet of utilizing according to claim 6, is characterized in that, described step 5) tempering process adopts 460 ℃ of-530 ℃ of constant temperature 2-5 hour.
8. a kind of method of effective compensation legal system for low heavy rare earth high-coercive force Sintered NdFeB magnet of utilizing according to claim 6, it is characterized in that, described step 5) tempering process adopts double tempering, be specially first at 890 ℃ of-920 ℃ of constant temperature 1.5-3 hour then 480 ℃ of-520 ℃ of constant temperature 2-5 hour.
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