CN103545079A - Double-principal-phase yttrium-contained permanent magnet and preparing method of double-principal-phase yttrium-contained permanent magnet - Google Patents
Double-principal-phase yttrium-contained permanent magnet and preparing method of double-principal-phase yttrium-contained permanent magnet Download PDFInfo
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- CN103545079A CN103545079A CN201310456582.XA CN201310456582A CN103545079A CN 103545079 A CN103545079 A CN 103545079A CN 201310456582 A CN201310456582 A CN 201310456582A CN 103545079 A CN103545079 A CN 103545079A
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Abstract
The invention discloses a double-principal-phase yttrium-contained permanent magnet, and belongs to the technical field of rare earth permanent magnetic materials. The chemical formula of the double-principal-phase yttrium-contained permanent magnet is (YetaRe1-eta)alphaFe100-alpha-beta-gammaBbetaTMgamma according to the mass percent, wherein the eta is larger than or equal to 0.05 and smaller than or equal to 0.6, the alpha is larger than or equal to 29 and smaller than or equal to 33, the beta is larger than or equal to 0.8 and smaller than or equal to 1.4, the gamma is larger than or equal to 0.5 and smaller than or equal to 3.6, the Re is one or more of elements of Nd, Pr, Dy, Tb and Ho, and the TM is one or more of elements of Ga, Co, Cu, Nb and Al. The double-principal-phase yttrium-contained permanent magnet is of the double-principal-phase structure comprising a (Y, Re)-Fe-B principal phase and a (Nd, Pr)-Fe-B principal phase. According to the double-principal-phase yttrium-contained permanent magnet prepared by a double-principal-phase alloy method, the good magnetic performance is kept, meanwhile, the Nd and the Pr can be greatly replaced by the relatively abundant Y, and the production cost of the double-principal-phase yttrium-contained permanent magnet is greatly reduced.
Description
Technical field
The invention belongs to rare-earth permanent-magnet material technical field, relate in particular to a kind of pair of principal phase containing yttrium permanent-magnet and preparation method thereof.
Background technology
Rare earth permanent-magnetic material as new material industry important component part, be widely used in the industries such as the energy, traffic, machinery, medical treatment, IT, household electrical appliances, as manufacture the aspects such as various magnetoes, vibrating motor, permanent magnetism instrument, electronics industry, nuclear magnetic resonance device, sound appliances and device for magnetotherapy, its product relates to a lot of fields of national economy.
The rare earths material that is used at present preparing Nd-Fe-B rare earth permanent magnetic material is mainly neodymium, praseodymium, dysprosium, terbium etc.Along with Nd-Fe-B rare earth permanent magnetic material consumption is increasing, the rare earth metals such as neodymium, praseodymium, dysprosium, terbium become scarce resource, are badly in need of finding the rare earth metal that can substitute these scarce resources.
Due to Y
2fe
14the anisotropy field H of B
afar below Nd
2fe
14b, the Y that adopts traditional preparation method to prepare
2fe
14b magnet cannot meet the requirement of user to performance, needs a kind of novel permanent-magnet alloy of research and development badly.
Along with the exploitation of the high yttrium of southern china or the rich europium type of middle yttrium Rare Earth Mine, yttrium relative surplus.At patent application CN101834045A, in patent application CN102360655A, related to the application of Y at rare earth permanent-magnetic material, but it adopts, be single alloyage, and the mass percent of Y is only at 1%-10%; In patent application CN200580001133.X, though mention in this rare earth permanent-magnetic material and can contain yttrium (single alloyage), but and the rare earth metal such as undeclared yttrium and neodymium, praseodymium has similar effect, can partly replace these in Nd-Fe-B rare earth permanent magnetic material and face short rare earth metal.
Single alloyage refers in the alloying ingredient stage and adds various raw material mixed smeltings to obtain the alloy pig of single component, then adopts traditional powder metallurgical sintering process to prepare magnet.And two alloyages are main-phase alloy of melting and an auxiliary phase alloy (or claiming liquid phase alloy, namely rich rare-earth phase, or title Grain-Boundary Phase).Wherein, the Main Function of auxiliary phase alloy be adjust principal phase component segregation, repair crystal boundary or realize liquid-phase sintering (Zhou Shouzeng etc., sintered NdFeB rare-earth permanent magnet material and technology, metallurgical industry publishing house, in September, 2011 version, the 12nd chapter).
Two main-phase alloy technique is to prepare respectively two kinds of main-phase alloy powders, mix by a certain percentage powder aftershaping, sintering, avoided single alloyage and two alloyages directly Y to be fused in alloy, make Y too much substituted the Pr in principal phase, Nd and the performance of severe exacerbation magnet, the remanent magnetism of final products, coercive force and magnetic energy product are all lower.
Summary of the invention
One of object of the present invention is to provide a kind of pair of principal phase containing yttrium permanent-magnet, and yttrium accounts for 5% ~ 60% of total amount of rare earth, and less or do not use heavy rare earth element; Another object of the present invention has been to provide the preparation method of a kind of pair of principal phase containing yttrium permanent-magnet, and when keeping good magnetic property, the production cost of magnet significantly reduces.
The of the present invention pair of principal phase, containing yttrium permanent-magnet, is characterized in that, the described pair of principal phase containing the chemical formula of yttrium permanent-magnet is by mass percentage: (Y
ηre
1-η)
αfe
100-alpha-beta-γb
βtM
γ, wherein, 0.05≤η≤0.6,29≤α≤33,0.8≤β≤1.4,0.5≤γ≤3.6, Re is Nd, Pr, Dy, Tb, one or more in Ho element, TM is Ga, Co, Cu, Nb, one or more in Al element, described pair of principal phase has two principal phase structures of (Y, Re)-Fe-B principal phase and (Pr, Nd)-Fe-B principal phase containing yttrium permanent-magnet.
Described, containing in yttrium permanent-magnet, yttrium content accounts for 5% ~ 60% of total amount of rare earth.
Two principal phases of this alloy are (Y
ηre
1-η)
2fe
14b(0.1≤η≤0.8) structure and (Pr
μnd
1-μ)
2fe
14b(0≤μ≤0.4) structure.
Pair principal phase, containing a preparation method for yttrium permanent-magnet, comprises the steps:
(1) adopt two kinds of different main-phase alloy of two principal phase Process preparation, the composition of the first main-phase alloy is (Pr by mass percentage
μnd
1-μ)
αfe
100-alpha-beta-γb
βtM
γ, wherein, 0≤μ≤0.4,27≤α≤33,0.8≤β≤1.4,0.5≤γ≤3.6, TM is Ga, Co, Cu, Nb, one or more in Al element; The composition of the second main-phase alloy is (Y by mass percentage
ηre
1-η)
αfe
100-alpha-beta-γb
βtM
γ, wherein, 0.1≤η≤0.8,27≤α≤33,0.8≤β≤1.4,0.5≤γ≤3.6, Re is Nd, Pr, Dy, Tb, one or more in Ho element, TM is Ga, Co, Cu, Nb, one or more in Al element, prepare respectively two kinds of raw materials;
(2) two kinds of raw materials that prepare in step (1) are carried out respectively to melting, through water-cooled copper roller, make the rapid-hardening flake that average thickness is 0.1 ~ 0.5mm;
(3) two kinds of rapid-hardening flake that make in step (2) are carried out respectively to hydrogen fragmentation, after dehydrogenation, obtain coarse crushing magnetic; Powder adds a certain amount of antioxidant; Then under inert gas shielding atmosphere, carry out respectively airflow milling, obtain D50 between 1 ~ 6 u m, the ratio of D50 is between 1:3 ~ 3:1, two kinds of magnetics of D90/D10 >=3.5;
(4), according to the composition requirement of different trade mark permanent-magnet alloys, take respectively in varing proportions two kinds of magnetics prepared by step (3) and in batch mixer, two kinds of magnetics are mixed;
(5) under inert gas shielding atmosphere, oriented moulding in the magnetic field that will to mix magnetic be 1.5 ~ 2.3T in magnetic field intensity, then carry out isostatic cool pressing, make blank;
(6) blank after moulding is put into sintering furnace and carry out sintering, temperature increasing schedule is: first 450 ~ 800 ℃ of insulations, within 1 ~ 10 hour, carry out dehydrogenation, then in 1000 ~ 1080 ℃ of insulation water-cooled or air cooling after 1 ~ 5 hour of sintering temperature;
(7) at 800 ~ 930 ℃ and 450 ~ 550 ℃ second annealings that carry out 1 ~ 4 hour, process respectively.
In described step (1), the required rare earth of preparation raw material adopts single rare earth metal, also can the definite norium of adoption rate.In described step (2), first, raw material are put into Medium frequency induction melting rapid hardening furnace crucible, in vacuum degree, reach 10
-2when Pa is above, to low-power preheating, treat that vacuum degree reaches 10 again
-2after Pa is above, stop vacuumizing and being filled with high-purity Ar, make in stove power per liter after Ar air pressure reaches-0.04 ~-0. 08MPa carry out melting; Until raw material, all after fusing, be incubated certain hour, and obtain electromagnetic agitation, subsequently by pouring metal melt to water-cooled copper roller, make the rapid-hardening flake that average thickness is 0.1 ~ 0.5mm.In described step (3), during airflow milling, the rotary speed of selection by winnowing wheel is controlled at 3000r/min ~ 4000r/min.In described step (6), in sintering process, dehydrogenation section programming rate is 2-3 ℃/min, approaches 1 hour of sintering temperature, and programming rate is about 0.5 ℃/min, is incubated 1 ~ 4 hour, then water-cooled or air cooling after reaching set point.
Design principle of the present invention is as follows: adopt two principal phases containing yttrium permanent-magnet and preparation method thereof, finally in magnet, form (Pr
μnd
1-μ)
2fe
14b(0≤μ≤0.4) phase (i.e. (Pr, Nd)-Fe-B) and (Y
ηre
1-η)
2fe
14b(0.1≤η≤0.8), there is crystal boundary rather than Y in (i.e. (Y, Re)-Fe-B) two principal phase structures between two-phase, Pr, Nd, the Re Re that mutually adulterates
2fe
14b mixed structure.Wherein, first principal phase (Pr, Nd)-Fe-B is that its composition is (Y not containing the higher phase of magnetic reversal ability of Y
ηre
1-η)
αfe
100-alpha-beta-γb
βtM
γ(wt. %); Second principal phase (Y, Re)-Fe-B is the lower phase of magnetic reversal ability that is rich in Y, and its composition is (Y
ηre
1-η)
αfe
100-alpha-beta-γb
βtM
γ(wt.%).
Because the magnetic reversal farmland more difficult diffusion of the lower phase of magnetic reversal ability (Y, Re)-Fe-B in the higher phase of magnetic reversal ability (Pr, Nd)-Fe-B grown up, therefore overcome well the poor shortcoming of (Y, Re)-Fe-B phase coercive force.Meanwhile, at (Y, Re)-Fe-B, by adding some other rare earth elements, improve its coercive force in mutually, finally obtain two principal phases of superperformance containing yttrium permanent-magnet.
Compared with prior art, beneficial effect of the present invention is:
(1) adopt the present invention to produce two principal phases containing yttrium permanent-magnet, when keeping good magnetic property, significantly increased the consumption of Y, account for the 5%-60% of total amount of rare earth, can utilize relative surplus, cheap rare-earth yttrium to substitute Nd and the Pr in neodymium iron boron, and make rare earth metal obtain comprehensive and balanced use; The production cost of magnet significantly reduces, and has improved greatly the cost performance of magnet, and its technology of preparing is suitable for through engineering approaches large-scale production;
(2) the present invention only needs two kinds of composition rapid hardening alloy sheets of melting, has the adjustable degree of freedom of higher composition;
(3) adopt two main-phase alloy technique to avoid directly Y being fused in alloy, make Y substitute too much the Pr in principal phase, Nd and the performance of severe exacerbation magnet, reduce remanent magnetism, coercive force and the magnetic energy product of final products.
Embodiment
embodiment 1:
It is [Y that design mix is pressed in preparation in accordance with the present invention preparation
0.6nd
0.3625ho
0.0375]
30fe
balb
1tM
o. 67(TM=Ga, Co, Cu, Nb, Al) two principal phases (wt.%) are containing yttrium permanent-magnet, and its concrete steps are as follows:
(1) preparing two kinds of different main-phase alloy, is Nd according to the composition of the first main-phase alloy by mass percentage
30fe
balb
1tM
0. 67(TM=Ga, Co, Cu, Nb, Al) (wt.%), the composition of the second main-phase alloy is [Y by mass percentage
0.8nd
0.15ho
0.05]
30fe
balb
1tM
0.67(TM=Ga, Co, Cu, Nb, Al) (wt.%), distinguishes preparation raw material;
(2) raw material preparing is carried out respectively to following melting: first raw material are put into medium frequency induction melting furnace crucible, in vacuum degree, reached 10
-2low-power preheating when Pa is above, treats that vacuum degree reaches 10 again
-2after Pa is above, stop vacuumizing and being filled with high-purity Ar, the power that makes to raise after reach-0.06Mpa of Ar air pressure in stove carries out melting; Until raw material, all after fusing, be incubated certain hour, and obtain electromagnetic agitation, subsequently by pouring metal melt to water-cooled copper roller, make the rapid-hardening flake that average thickness is 0.3mm.
(3) prepared two kinds of rapid-hardening flake are respectively charged in hydrogenation furnace and carry out coarse crushing, subsequently at N
2under protective atmosphere, carry out respectively airflow milling, during airflow milling, the rotary speed of selection by winnowing wheel is controlled at 3500r/min, makes the particle mean size of magnetic in 2.0-5.0 μ m scope;
(4) according to design mix, two kinds of magnetics of step 3 preparation are mixed, wherein composition is [Y
0.8nd
0.15ho
0.05]
30fe
balb
1tM
0.67(TM=Ga, Co, Cu, Nb, Al) magnetic (wt.%) accounts for 75% of total weight, in batch mixer, two kinds of magnetics is fully mixed;
(5) at N
2under protective atmosphere, will mix oriented moulding in the magnetic field that magnetic is 2T in magnetic field intensity, then carry out isostatic cool pressing, make blank;
(6) sintering furnace of the blank after moulding being put into high vacuum carries out sintering, in sintering process, dehydrogenation section programming rate is 2-3 ℃/min, wherein in sintering process at 450 ℃, 650 ℃, 800 ℃ are incubated respectively further dehydrogenation in 1 hour, approach 1 hour of sintering temperature, programming rate is about 0.5 ℃/min, is incubated 1 ~ 4 hour, then or air cooling cooling with stove after reaching set point;
(7) finally respectively 930 ℃ and 520 ℃ of temper of carrying out 2 hours.
The magnetic property of test magnet, performance is as shown in table 1.
Table 1 is that two principal phases of embodiment 1 are containing the magnetic property of yttrium permanent-magnet
embodiment 2
It is [Y that design mix is pressed in preparation in accordance with the present invention preparation
0.48pr
0.1nd
0.4dy
0.02]
30fe
balb
1tM
o. 67(TM=Ga, Co, Cu, Nb, Al) two principal phases (wt.%) are containing yttrium permanent-magnet, and its concrete steps are as follows:
(1) prepare two kinds of different main-phase alloy, the composition of the first main-phase alloy is (Pr by mass percentage
0.25nd
0.75)
30fe
balb
1tM
0. 67(TM=Ga, Co, Cu, Nb, Al) (wt.%), the composition of the second main-phase alloy is [Y by mass percentage
0.8nd
0.167dy
0.033]
30fe
balb
1tM
0.67(TM=Ga, Co, Cu, Nb, Al) (wt.%), distinguishes preparation raw material;
(2) raw material preparing is carried out respectively to following melting: first raw material are put into medium frequency induction melting furnace crucible, in vacuum degree, reached 10
-2low-power preheating when Pa is above, treats that vacuum degree reaches 10 again
-2after Pa is above, stop vacuumizing and being filled with high-purity Ar, the power that makes to raise after reach-0.06Mpa of Ar air pressure in stove carries out melting; Until raw material, all after fusing, be incubated certain hour, and obtain electromagnetic agitation, subsequently by pouring metal melt to water-cooled copper roller, make the rapid-hardening flake that average thickness is 0.3mm;
(3) prepared two kinds of rapid-hardening flake are respectively charged in hydrogenation furnace and carry out coarse crushing, subsequently at N
2under protective atmosphere, carry out respectively airflow milling, during airflow milling, the rotary speed of selection by winnowing wheel is controlled at 3200r/min, makes the particle mean size of magnetic in 3.5 μ m left and right;
(4) according to design mix, two kinds of magnetics of step 3 preparation are mixed, wherein composition is [Y
0.8nd
0.167dy
0.033]
30fe
balb
1tM
0.67(TM=Ga, Co, Cu, Nb, Al) magnetic (wt.%) accounts for 60% of total weight, in batch mixer, two kinds of magnetics is fully mixed;
(5) at N
2under protective atmosphere, will mix oriented moulding in the magnetic field that magnetic is 2T in magnetic field intensity, then carry out isostatic cool pressing, make blank;
(6) sintering furnace of the blank after moulding being put into high vacuum carries out sintering, in sintering process, dehydrogenation section programming rate is 2-3 ℃/min, wherein in sintering process at 460 ℃, 640 ℃, 820 ℃ are incubated respectively further dehydrogenation in 1 hour, approach 1 hour of sintering temperature, programming rate is about 0.5 ℃/min, is incubated 1 ~ 4 hour, then or air cooling cooling with stove after reaching set point;
(7) finally respectively 900 ℃ and 510 ℃ of temper of carrying out 2 hours.
The magnetic property of test magnet, performance is as table 2,
Table 2 is that two principal phases of embodiment 2 are containing the magnetic property of yttrium permanent-magnet
embodiment 3
It is [Y that design mix is pressed in preparation in accordance with the present invention preparation
0.2nd
0.8]
30fe
balb
1tM
o. 67(TM=Ga, Co, Cu, Nb, Al) two principal phases (wt.%) are containing yttrium permanent-magnet, and its concrete steps are as follows:
(1) prepare two kinds of different main-phase alloy, the composition of the first main-phase alloy is Nd by mass percentage
30fe
balb
1tM
0. 67(TM=Ga, Co, Cu, Nb, Al) (wt.%), the composition of the second main-phase alloy is (Y by mass percentage
0.3nd
0.7)
30fe
balb
1tM
0.67(TM=Ga, Co, Cu, Nb, Al) (wt.%), distinguishes preparation raw material;
(2) raw material preparing is carried out respectively to following melting: first raw material are put into medium frequency induction melting furnace crucible, in vacuum degree, reached 10
-2low-power preheating when Pa is above, treats that vacuum degree reaches 10 again
-2after Pa is above, stop vacuumizing and being filled with high-purity Ar, the power that makes to raise after reach-0.06Mpa of Ar air pressure in stove carries out melting; Until raw material, all after fusing, be incubated certain hour, and obtain electromagnetic agitation, subsequently by pouring metal melt to water-cooled copper roller, make the rapid-hardening flake that average thickness is 0.28-0.35mm;
(3) prepared two kinds of rapid-hardening flake are respectively charged in hydrogenation furnace and carry out coarse crushing, under Ar protective atmosphere, carry out respectively airflow milling subsequently, during airflow milling, the rotary speed of selection by winnowing wheel is controlled at 3300r/min, makes the particle mean size of magnetic in 3.0 μ m left and right;
(4) according to design mix, two kinds of magnetics of step 3 preparation are mixed, wherein composition is (Y
0.3nd
0.7)
30fe
balb
1tM
0.67(TM=Ga, Co, Cu, Nb, Al) magnetic (wt.%) accounts for 66.7% of total weight, in batch mixer, two kinds of magnetics is fully mixed;
(5) under Ar protective atmosphere, will mix oriented moulding in the magnetic field that magnetic is 2.1T in magnetic field intensity, then carry out isostatic cool pressing, make blank;
(6) sintering furnace of the blank after moulding being put into high vacuum carries out sintering, in sintering process, dehydrogenation section programming rate is 2-3 ℃/min, wherein in sintering process at 450 ℃, 660 ℃, 810 ℃ are incubated respectively further dehydrogenation in 1 hour, approach 1 hour of sintering temperature, programming rate is about 0.5 ℃/min, is incubated 1 ~ 4 hour, then or air cooling cooling with stove after reaching set point;
(7) finally respectively 920 ℃ and 500 ℃ of temper of carrying out 2 hours.
The magnetic property of test magnet, performance is as table 3,
Table 3 is that two principal phases of embodiment 3 are containing the magnetic property of yttrium permanent-magnet
Claims (6)
1. two principal phases, containing a yttrium permanent-magnet, is characterized in that: the described pair of principal phase containing the chemical formula of yttrium permanent-magnet is by mass percentage: (Y
ηre
1-η)
αfe
100-alpha-beta-γb
βtM
γ, wherein, 0.05≤η≤0.6,29≤α≤33,0.8≤β≤1.4,0.5≤γ≤3.6, Re is Nd, Pr, Dy, Tb, one or more in Ho element, TM is Ga, Co, Cu, Nb, one or more in Al element; Described pair of principal phase has two principal phase structures of (Y, Re)-Fe-B principal phase and (Pr, Nd)-Fe-B principal phase containing yttrium permanent-magnet.
2. as claimed in claim 1 pair of principal phase, containing yttrium permanent-magnet, is characterized in that: described, containing in yttrium permanent-magnet, yttrium content accounts for 5% ~ 60% of total amount of rare earth.
3. the two principal phases as described in claim l, containing yttrium permanent-magnet, is characterized in that: two principal phases of this alloy are (Y
ηre
1-η)
2fe
14b, 0.1≤η≤0.8 structure and (Pr
μnd
1-μ)
2fe
14b, 0≤μ≤0.4 structure.
4. the two principal phases as described in claim l, containing a preparation method for yttrium permanent-magnet, is characterized in that: described preparation method comprises the steps:
(1) adopt two kinds of different main-phase alloy of two main-phase alloy Process preparation, the composition of the first main-phase alloy is (Pr by mass percentage
μnd
1-μ)
αfe
100-alpha-beta-γb
βtM
γ, wherein, 0≤μ≤0.4,27≤α≤33,0.8≤β≤1.4,0.5≤γ≤3.6, TM is Ga, Co, Cu, Nb, one or more in Al element; The composition of the second main-phase alloy is (Y by mass percentage
ηre
1-η)
αfe
100-alpha-beta-γb
βtM
γ, wherein, 0.1≤η≤0.8,27≤α≤33,0.8≤β≤1.4,0.5≤γ≤3.6, Re is Nd, Pr, Dy, Tb, one or more in Ho element, TM is Ga, Co, Cu, Nb, one or more in Al element, prepare respectively two kinds of raw materials;
(2) two kinds of raw materials that prepare in step (1) are carried out respectively to melting, through water-cooled copper roller, make the rapid-hardening flake that average thickness is 0.1～0.5mm;
(3) two kinds of rapid-hardening flake that make in step (2) are carried out respectively to hydrogen fragmentation, after dehydrogenation, obtain coarse crushing magnetic, powder adds antioxidant, then under inert gas shielding atmosphere, carry out respectively airflow milling, obtain D50 between 1 ~ 6 u m, the ratio of D50 is between 1:3 ~ 3:1, two kinds of magnetics of D90/D10 >=3.5;
(4), according to the composition requirement of permanent-magnet alloy, take respectively in varing proportions two kinds of magnetics prepared by step (3) and in batch mixer, two kinds of magnetics are mixed;
(5) under inert gas shielding atmosphere, oriented moulding in the magnetic field that will to mix magnetic be 1.5 ~ 2.3T in magnetic field intensity, then carry out isostatic cool pressing, make blank;
(6) blank after moulding is put into vacuum sintering furnace and carry out sintering, temperature increasing schedule is: first 450 ~ 800 ℃ of insulations, within 1 ~ 10 hour, carry out dehydrogenation, then in 1000 ~ 1080 ℃ of insulation cooling or air cooling with stove after 1 ~ 5 hour of sintering temperature;
(7) at 800 ~ 930 ℃ and 450 ~ 550 ℃ second annealings that carry out 1 ~ 4 hour, process respectively.
5. the as claimed in claim 4 pair of principal phase, containing the preparation method of yttrium permanent-magnet, is characterized in that: in described step (1), the required rare earth of preparation raw material adopts single rare earth metal, or the definite norium of adoption rate.
6. the as claimed in claim 4 pair of principal phase is containing the preparation method of yttrium permanent-magnet, it is characterized in that: in described step (4), two kinds of magnetics that in varing proportions prepared by blend step (3), mixed powder, moulding, sintering, be made into the different permanent-magnet of performance requirement.
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| CN105931775A (en) * | 2016-06-27 | 2016-09-07 | 无锡新大力电机有限公司 | Preparation method of yttrium iron-based permanent magnet material |
| CN105989982A (en) * | 2015-02-13 | 2016-10-05 | 有研稀土新材料股份有限公司 | Yttrium iron-based magnetic material, preparing method thereof and yttrium iron-based rare earth permanent magnet |
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| CN108242305A (en) * | 2016-12-27 | 2018-07-03 | 有研稀土新材料股份有限公司 | Rare earth permanent-magnetic material and preparation method thereof |
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| US10192661B2 (en) | 2013-04-22 | 2019-01-29 | Tdk Corporation | R—T—B based sintered magnet |
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| CN105989982B (en) * | 2015-02-13 | 2018-11-06 | 有研稀土新材料股份有限公司 | Yttrium iron base magnetic material, preparation method and yttrium iron base rear earth permanent magnet |
| CN105989982A (en) * | 2015-02-13 | 2016-10-05 | 有研稀土新材料股份有限公司 | Yttrium iron-based magnetic material, preparing method thereof and yttrium iron-based rare earth permanent magnet |
| CN105931775A (en) * | 2016-06-27 | 2016-09-07 | 无锡新大力电机有限公司 | Preparation method of yttrium iron-based permanent magnet material |
| CN107622853A (en) * | 2016-07-15 | 2018-01-23 | Tdk株式会社 | R T B based rare earth element permanent magnets |
| CN107622853B (en) * | 2016-07-15 | 2019-09-20 | Tdk株式会社 | R-T-B based rare earth element permanent magnet |
| CN108242305A (en) * | 2016-12-27 | 2018-07-03 | 有研稀土新材料股份有限公司 | Rare earth permanent-magnetic material and preparation method thereof |
| DE112018001630T5 (en) | 2018-04-09 | 2019-12-12 | Grirem Advanced Materials Co., Ltd. | Rare earth permanent magnet material with added yttrium and manufacturing method therefor |
| CN109346258A (en) * | 2018-09-08 | 2019-02-15 | 江西理工大学 | A kind of nano double main phase magnet and preparation method thereof |
| CN110767401A (en) * | 2019-11-06 | 2020-02-07 | 烟台首钢磁性材料股份有限公司 | Method for improving performance of sintered neodymium-iron-boron magnet |
| US11569012B2 (en) | 2019-11-06 | 2023-01-31 | Yantai Dongxing Magnetic Materials Inc. | Method for improving performance of sintered NdFeB magnets |
| CN115028442A (en) * | 2022-06-06 | 2022-09-09 | 横店集团东磁股份有限公司 | Preparation method for improving compressive strength of permanent magnetic ferrite magnetic shoe |
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