CN103137315A - Method for preparing low-weightlessness rare earth-iron-boron permanent magnet - Google Patents
Method for preparing low-weightlessness rare earth-iron-boron permanent magnet Download PDFInfo
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Abstract
The invention discloses a method for preparing a low-weightlessness rare earth-iron-boron permanent magnet. The method includes a first step of preparing heavy rare earth-cobalt liquid phase alloy powder and neodymium iron boron (NdFeB) alloy powder, wherein the average particle size of the heavy rare earth-cobalt liquid phase alloy powder and the NdFeB alloy powder is 1-10 micrometers, a second step of enabling nanometer zinc (Zn) powder to be evenly scattered in antioxidants, a third step of enabling composite liquid phase powder formed by the nanometer Zn power and the liquid phase alloy powder to be evenly mixed with the NdFeB powder under the protection of nitrogen, a fourth step of carrying out orienting molding and isostatic cool pressing processing on the evenly mixed NdFeB powder in a magnetic field, and a fifth step of carrying out vacuum sintering tempering processing to produce the magnet. According to the method, the heavy rare earth-cobalt liquid phase alloy powder and the nanometer Zn powder are compounded and added in the NdFeB powder, and the nanometer Zn powder is evenly distributed in grain boundary phase and is wrapped on a principal phase epitaxial layer. The method enhances the anti-oxidation capacity of the principal phase and the grain boundary phase of the magnet, and reduces weightlessness of the magnet. Meanwhile, through addition of the Zn powder, the usage amount of the heavy rare earth-cobalt liquid phase alloy powder is decreased, the magnetic performance of the magnet is reduced rarely, and rare earth resources can be used efficiently.
Description
Technical field
The present invention relates to a kind of method for preparing low weightless rare-earth-iron-boron permanent magnet, belong to field of magnetic material.
Background technology
Sintered NdFeB NdFeB system (Typical Representative of rare-earth-iron-boron permanent magnet) permanent magnet is the best permanent magnetic material of present magnetic property, has been widely used in the numerous areas such as motor, automobile, wind power generation.But this class magnet has an obvious shortcoming, i.e. magnet corrosion-resistant (magnet weightlessness is larger), thus limited the further expansion of magnet applications scope.
The corrosion of sintered NdFeB based permanent magnet mainly comes autoxidation, i.e. chemical corrosion.Sintered NdFeB NdFeB based material is by three phase compositions, principal phase matrix Nd
2Fe
14B, rich B phase and rich Nd are mutually.The oxidability of three phases is different, and rich B oxidability is stronger, is secondly rich Nd phase and matrix phase.The oxidation of sintered NdFeB based permanent magnet begins mutually from rich B phase and rich Nd often, because rich B phase and rich Nd are distributed in grain boundaries, oxidation is from crystal boundary.Therefore, improve the antiseptic power of sintered NdFeB NdFeB based material, reduce material weightless, generally all set about from optimizing grain boundary structure.
For solving this difficult problem, people have carried out a lot of researchs.What a kind of effective method was exactly to add trace (usually in 3%) in sintered NdFeB NdFeB material crystal boundary contains heavy rare earth-cobalt liquid phase alloy R
aCo
bGa
100-a-b(R is one or both in heavy rare earth element Dy and Tb, 60≤a≤80,10≤b≤15), improve sintered NdFeB NdFeB material grain boundary structure, improve the electronegativity of Grain-Boundary Phase, reduce corrosion electric current density, reduce intercrystalline corrosion, thereby reduced the weightlessness of magnet; But this adding technique also has its limitation: at first heavy rare earth proportion in the alloy liquid phase of heavy rare earth-cobalt is larger, and this addition manner can cause the cost price of magnet to rise, and reduces the utilization ratio of rare earth resources; Secondly Co enters Grain-Boundary Phase, forms the soft magnetism phase, and the easy forming core of nuclei of reversed domain under counter magnetic field reduces the magnet coercive force.
Summary of the invention
The object of the present invention is to provide a kind of method for preparing low weightless sintered NdFeB based permanent magnet.
The method of the low weightless rare-earth-iron-boron permanent magnet of preparation of the present invention comprises the steps:
(1) vacuum melting prepares heavy rare earth-cobalt liquid phase alloy and Nd Fe B alloys and its difference hydrogen is broken, is prepared into respectively through airflow milling the fine powder that particle mean size is 1-10 μ m;
(2) nanometer Zn powder is dissolved in antioxidant, makes Zn powder Uniform Dispersion; Described antioxidant is ordinary organic solvents commonly used in Nd Fe B alloys preparation technology, and it also can dilute nanometer Zn powder, prevents the nanometer Zn powder reunion, and it can adopt binary or polyol-based non-ionic surfactant such as C
15H
24O
2, also can adopt the 1# antioxidant (commercially available prod model YSH-01) as Tianjin happy holy new material research institute.
(3) will be dissolved with the antioxidant of nanometer Zn powder and the compound liquid phase powder that liquid phase alloyed powder mixing forms, add under nitrogen protection in the Nd Fe B alloys powder, and make it to be evenly distributed in the neodymium iron boron powder;
(4) the neodymium iron boron powder oriented moulding in magnetic field after above-mentioned mixing is obtained pressed compact, pressed compact is that the 200MPa isostatic cool pressing is processed through excess pressure again;
(5) with the pressed compact vacuum-sintering after step (4) is processed, more tempered processing, magnet made.
Preferably, in step (1), described heavy rare earth-cobalt liquid phase alloy composition is R
aCo
bGa
100-a-b, wherein, R is one or both in heavy rare earth element Dy and Tb, 60≤a≤80,10≤b≤15; Described Nd Fe B alloys consists of McQxPyNz, wherein, M is one or more in Pr, Nd, Dy, Tb, Ho, Gd element, is preferably Nd, Q be Fe, Co element one or both, be preferably mixing of Fe or Fe and Co, P is the B element, and N is one or more of Al, Nb, Zr, Cu, Ga, Mo, W, V element, 29≤c≤34,64≤x≤68,0.98≤y≤1.1,0≤z≤1; Described vacuum melting prepares heavy rare earth-cobalt liquid phase alloy R
aCo
bGa
100-a-bAnd Nd Fe B alloys McQxPyNz is that the vacuum melting technology commonly used of alloy refining is namely after each batching is melted in the vacuum induction melting furnace crucible by the quality proportioning and stirring, to be cooled to alloy after cast.
Preferably, described liquid phase alloy is prepared into through airflow milling the fine powder that particle mean size is 1-5 μ m, and Nd Fe B alloys is prepared into through airflow milling the fine powder that particle mean size is preferably 3-6 μ m.
In step (2), described nanometer Zn powder size is preferably 1-200nm, and the weight ratio of nanometer Zn powder and antioxidant is 1:1-3.
In step (3), the adding proportion of described compound liquid phase powder is preferably the 0.5%-2.0% of neodymium iron boron powder weight, and nanometer Zn powder preferably accounts for the 30%-70% of compound liquid phase grain weight amount.
In step (4), the intensity of alignment magnetic field is preferably 1.0-2.0T.
In step (5), preferred, pressed compact 1000 ℃-1200 ℃ vacuum-sintering 4-6 hour.
In step (5), described temper is prior to 880 ℃ of-920 ℃ of one-level tempering 2-4 hour, and then processes 4-6 hour in 450 ℃ of-600 ℃ of second annealings.
Described heavy rare earth-cobalt liquid phase alloy and Nd Fe B alloys comprise: alloy of ingot or rapid hardening slab alloy.Described moulding comprises open moulding under sealing nitrogen protection mode moulding and room temperature condition.
The present invention is compound interpolation heavy rare earth-cobalt alloy liquid phase powder and nanometer Zn powder in the neodymium iron boron powder, due to approximately 910 ℃ of the boiling points of Zn powder, volatile under high temperature, nanometer Zn powder addition large percentage, can guarantee that enough Zn powder enter Grain-Boundary Phase and principal phase epitaxial loayer, and nanometer Zn powder is uniformly distributed in Grain-Boundary Phase and is wrapped in the principal phase epitaxial loayer, has strengthened the anti-aging capability of magnet principal phase and Grain-Boundary Phase, and magnet is weightless to be reduced; The interpolation of Zn powder simultaneously, heavy rare earth-cobalt alloy liquid phase powder consumption reduces, and the magnet magnetic property reduces seldom, rare earth resources also gets the efficient use, and therefore according to the magnet of processing method preparation of the present invention, weightlessness is lower, corrosion resistance strengthens, and has more lower cost, and application is more extensive.
Embodiment
Embodiment 1
1., vacuum melting prepares heavy rare earth-cobalt liquid phase alloy Dy
65Co
15Ga
20And Nd Fe B alloys (PrNd)
30.5Dy
1.5Fe
65.8B
1.0Nb
0.3Co
1.0Cu
0.1Al
0.4Described liquid phase alloy and Nd Fe B alloys are inhaled that hydrogen is broken, after 540 ℃ of dehydrogenations process, evenly mixed under nitrogen protection, in hermetically sealed can, then become micro mist through airflow milling powder through hydrogen crushing furnace respectively; liquid phase alloyed powder particle mean size is 2.5um, and neodymium iron boron powder particle mean size is 3.2um.
2., be the nanometer Zn powder of 50nm with particle mean size, antioxidant (commercially available prod, model YSH-01) mixes, frequency of utilization is that the 2.7KHz ultrasonic wave is processed, and the Zn powder is dispersed in antioxidant; Antioxidant is mainly the dilution nanometer Zn powder, prevents the nanometer Zn powder reunion; The weight ratio of nanometer Zn powder and antioxidant is 1:1.5.
3., add in hermetically sealed can in the Nd Fe B alloys powder containing the antioxidant of nanometer Zn powder, compound liquid phase powder that the liquid phase alloyed powder forms under nitrogen protection, used the three-dimensional material mixer batch mixing 2 hours, compound liquid phase powder is evenly distributed in the Nd Fe B alloys powder; Compound liquid phase powder adding proportion is 1.0% of Nd Fe B alloys powder weight, and the antioxidant that wherein contains nanometer Zn powder accounts for 40% of compound liquid phase grain weight amount.
4., the neodymium iron boron powder under sealing nitrogen protection mode moulding and room temperature condition, oriented moulding first pressing in the magnetic field of 1.2T, then be that the 200MPa isostatic cool pressing is pressed into blank through pressure.
5., pressed compact is 1045 ℃ of vacuum-sinterings 5 hours, then processes 5 hours through 900 ℃ of one-level tempering 3 hours and 480 ℃ of second annealings, makes magnet.
Comparative Examples 1: use above-mentioned same process, only add the liquid phase alloyed powder Dy of identical weight ratio
65Co
15Ga
20With the Nd Fe B alloys powder, do not add the Zn powder, the preparation neodymium iron boron magnetic body.
PCT tests (120 ℃ ± 3 ℃ of temperature, humidity 100%RH, pressure 0.2MPa, 400 hours), sample size Ф 10 * 10mm, and the test magnet is weightless, result such as table one:
Table one adds the nanometer Zn powder magnet and does not add the weightless contrast of magnet
| Classification | Weight (mg) before test | Weight (mg) after test | Weightless (mg/cm2) |
| Plus nano Zn not | 7614 | 7513 | 6.9 |
| Add nanometer Zn | 7718 | 7680 | 6.21 |
Embodiment 2
1., heavy rare earth-cobalt liquid phase alloying component is Dy
70Co
15Ga
15, Nd Fe B alloys composition (PrNd)
31.5Dy
0.5Fe
65.07B
1.03Zr
0.3Co
1.5Cu
0.1Al
0.5, airflow milling powder liquid phase alloyed powder particle mean size is that 3.5um, neodymium iron boron powder particle mean size are 4.0um; Hydrogen is broken, airflow milling powder technique is with embodiment 1.
2., the nanometer Zn powder particle mean size is 100nm, the weight ratio of nanometer Zn powder and antioxidant is 1:2.The preparation method is with embodiment 1;
3., compound liquid phase powder adding proportion is 1.5% of neodymium iron boron powder weight, the antioxidant that wherein contains nanometer Zn powder accounts for 60% of compound liquid phase grain weight amount, blending processes of powders is with embodiment 1;
4., the moulding alignment magnetic field is 1.5T, moulding and isostatic pressing process are with embodiment 1.
5., pressed compact is 1045 ℃ of vacuum-sinterings 5 hours, then processes 5 hours through 900 ℃ of one-level tempering 3 hours and 480 ℃ of second annealings, makes magnet.
Comparative Examples 2: use above-mentioned same process, only add the liquid phase alloyed powder Dy of identical weight ratio
65Co
15Ga
20With the Nd Fe B alloys powder, do not add the Zn powder, the preparation neodymium iron boron magnetic body.
PCT tests (120 ℃ ± 3 ℃ of temperature, humidity 100%RH, pressure 0.2MPa, 400 hours), sample size Ф 10 * 10mm, and the test magnet is weightless, result such as table two:
Table two adds the nanometer Zn powder magnet and does not add the weightless contrast of magnet
| Classification | Weight (mg) before test | Weight (mg) after test | Weightless (mg/cm2) |
| Plus nano Zn not | 7718 | 7481 | 5.28 |
| Add nanometer Zn | 7609 | 7598 | 4.89 |
Embodiment 3
1., heavy rare earth-cobalt liquid phase alloying component is Dy
75Co
10Ga
15, Nd Fe B alloys composition (PrNd)
32Fe
64.45B
1.05Zr
0.4Co
1.5Cu
0.1Al
0.5, airflow milling powder liquid phase alloyed powder particle mean size is that 4.0um, neodymium iron boron powder particle mean size are 4.5um; Hydrogen is broken, airflow milling powder technique is with embodiment 1.
2., the nanometer Zn powder particle mean size is 150nm, the weight ratio of nanometer Zn powder and antioxidant is 1:1.5.The preparation method is with embodiment 1;
3., compound liquid phase powder adding proportion is 1.8% of neodymium iron boron powder weight, the antioxidant that wherein contains nanometer Zn powder accounts for 65% of compound liquid phase grain weight amount, blending processes of powders is with embodiment 1;
4., the moulding alignment magnetic field is 1.5T, moulding and isostatic pressing process are with embodiment 1.
5., pressed compact is 1043 ℃ of vacuum-sinterings 5 hours, then processes 5 hours through 900 ℃ of one-level tempering 3 hours and 480 ℃ of second annealings, makes magnet.
Comparative Examples 3: use above-mentioned same process, only add the liquid phase alloyed powder Dy of identical weight ratio
65Co
15Ga
20With the Nd Fe B alloys powder, do not add the Zn powder, the preparation neodymium iron boron magnetic body.
PCT tests (120 ℃ ± 3 ℃ of temperature, humidity 100%RH, pressure 0.2MPa, 400 hours), sample size Ф 10 * 10mm, and the test magnet is weightless, result such as table three:
Table three adds the nanometer Zn powder magnet and does not add the weightless contrast of magnet
| Classification | Weight (mg) before test | Weight (mg) after test | Weightless (mg/cm2) |
| Plus nano Zn not | 7627 | 7605 | 3.92 |
| Add nanometer Zn | 7610 | 7588 | 3.56 |
Embodiment 4
1., heavy rare earth-cobalt liquid phase alloying component is Tb
10Dy
60Co
15Ga
15, Nd Fe B alloys composition (PrNd)
32.5Dy
1.0Fe
63.45B
1.05Zr
0.4Co
1.0Cu
0.1Al
0.5, airflow milling powder liquid phase alloyed powder particle mean size is that 3.0um, neodymium iron boron powder particle mean size are 4.0um; Hydrogen is broken, airflow milling powder technique is with embodiment 1.
2., the nanometer Zn powder particle mean size is 120nm, the weight ratio of nanometer Zn powder and antioxidant is 1:1.5.The preparation method is with embodiment 1;
3., compound liquid phase powder adding proportion is 1.4% of neodymium iron boron powder weight, the antioxidant that wherein contains nanometer Zn powder accounts for 50% of compound liquid phase grain weight amount, blending processes of powders is with embodiment 1;
4., the moulding alignment magnetic field is 1.2T, moulding and isostatic pressing process are with embodiment 1.
5., pressed compact is 1048 ℃ of vacuum-sinterings 5 hours, then processes 5 hours through 900 ℃ of one-level tempering 3 hours and 480 ℃ of second annealings, makes magnet.
Comparative Examples 4: use above-mentioned same process, only add the liquid phase alloyed powder Dy of identical weight ratio
65Co
15Ga
20With the Nd Fe B alloys powder, do not add the Zn powder, the preparation neodymium iron boron magnetic body.
PCT tests (120 ℃ ± 3 ℃ of temperature, humidity 100%RH, pressure 0.2MPa, 400 hours), sample size Ф 10 * 10mm, and the test magnet is weightless, result such as table four:
Table four adds the nanometer Zn powder magnet and does not add the weightless contrast of magnet
| Classification | Weight (mg) before test | Weight (mg) after test | Weightless (mg/cm2) |
| Plus nano Zn not | 7627 | 7600 | 4.48 |
| Add nanometer Zn | 7751 | 7728 | 3.95 |
Embodiment 5
1., heavy rare earth-cobalt liquid phase alloying component is Tb
30Dy
50Co
10Ga
10, Nd Fe B alloys composition (PrNd)
32.5Fe
64.15B
1.05Nb
0.4Co
1.5Cu
0.1Al
0.3, airflow milling powder liquid phase alloyed powder particle mean size is that 3.8um, neodymium iron boron powder particle mean size are 4.2um; Hydrogen is broken, airflow milling powder technique is with embodiment 1.
2., the nanometer Zn powder particle mean size is 180nm, the weight ratio of nanometer Zn powder and antioxidant is 1:1.5.The preparation method is with embodiment 1;
3., compound liquid phase powder adding proportion is 1.8% of neodymium iron boron powder weight, the antioxidant that wherein contains nanometer Zn powder accounts for 70% of compound liquid phase grain weight amount, blending processes of powders is with embodiment 1;
4., the moulding alignment magnetic field is 1.5T, moulding and isostatic pressing process are with embodiment 1.
5., pressed compact is 1040 ℃ of vacuum-sinterings 5 hours, then processes 5 hours through 900 ℃ of one-level tempering 3 hours and 480 ℃ of second annealings, makes magnet.
Comparative Examples 5: use above-mentioned same process, only add the liquid phase alloyed powder Dy of identical weight ratio
65Co
15Ga
20With the Nd Fe B alloys powder, do not add the Zn powder, the preparation neodymium iron boron magnetic body.
PCT tests (120 ℃ ± 3 ℃ of temperature, humidity 100%RH, pressure 0.2MPa, 400 hours), sample size Ф 10 * 10mm, and the test magnet is weightless, result such as table five:
Table five adds the nanometer Zn powder magnet and does not add the weightless contrast of magnet
| Classification | Weight (mg) before test | Weight (mg) after test | Weightless (mg/cm2) |
| Plus nano Zn not | 7751 | 7730 | 3.64 |
| Add nanometer Zn | 7627 | 7606 | 3.48 |
Embodiment 6
1., heavy rare earth-cobalt liquid phase alloying component is Tb
75Co
15Ga
15, Nd Fe B alloys composition (PrNd)
32Dy
0.5Fe
64.15B
1.05Nb
0.4Co
1.5Cu
0.1Al
0.1, airflow milling powder liquid phase alloyed powder particle mean size is that 4.2um, neodymium iron boron powder particle mean size are 5.0um; Hydrogen is broken, airflow milling powder technique is with embodiment 1.
2., the nanometer Zn powder particle mean size is 120nm, the preparation method is with embodiment 1;
3., compound liquid phase powder adding proportion is 0.8% of neodymium iron boron powder weight, the antioxidant that wherein contains nanometer Zn powder accounts for 65% of compound liquid phase grain weight amount, blending processes of powders is with embodiment 1;
4., the moulding alignment magnetic field is 1.5T, moulding and isostatic pressing process are with embodiment 1.
5., pressed compact is 1042 ℃ of vacuum-sinterings 5 hours, then processes 5 hours through 900 ℃ of one-level tempering 3 hours and 480 ℃ of second annealings, makes magnet.
Comparative Examples 6: use above-mentioned same process, only add the liquid phase alloyed powder Dy of identical weight ratio
65Co
15Ga
20With the Nd Fe B alloys powder, do not add the Zn powder, the preparation neodymium iron boron magnetic body.
PCT tests (120 ℃ ± 3 ℃ of temperature, humidity 100%RH, pressure 0.2MPa, 400 hours), sample size Ф 10 * 10mm, and the test magnet is weightless, result such as table six:
Table six adds the nanometer Zn powder magnet and does not add the weightless contrast of magnet
| Classification | Weight (mg) before test | Weight (mg) after test | Weightless (mg/cm2) |
| Plus nano Zn not | 7610 | 7594 | 2.54 |
| Add nanometer Zn | 7589 | 7575 | 2.32 |
Above embodiment shows, compound interpolation heavy rare earth-cobalt alloy liquid phase and nanometer Zn powder in magnet, and the oxidation resistance of principal phase and Grain-Boundary Phase improves, and magnet is weightless to be reduced, and heavy rare earth-cobalt alloy liquid phase powder consumption reduces simultaneously, and rare earth resources gets the efficient use.
It is to be noted; the above embodiment of the present invention 1-6 has done part nanometer Zn powder adding proportion and/or part technique to illustrate with further illustrating or explaining flesh and blood of the present invention; and be not simple restriction to flesh and blood of the present invention; therefore; those skilled in the art should know, any based on connotation of the present invention simple transformation or improve all should belong to protection scope of the present invention within.
Claims (9)
1. a method for preparing low weightless rare-earth-iron-boron permanent magnet, comprise the steps:
(1) vacuum melting prepares heavy rare earth-cobalt liquid phase alloy and Nd Fe B alloys and its difference hydrogen is broken, is prepared into respectively through airflow milling the fine powder that particle mean size is 1-10 μ m;
(2) nanometer Zn powder is dissolved in antioxidant, makes Zn powder Uniform Dispersion;
(3) will be dissolved with the antioxidant of nanometer Zn powder and the compound liquid phase powder that liquid phase alloyed powder mixing forms, add under nitrogen protection in the Nd Fe B alloys powder, and make it to be evenly distributed in the neodymium iron boron powder;
(4) the neodymium iron boron powder oriented moulding in magnetic field after above-mentioned mixing is obtained pressed compact, pressed compact is that the 200MPa isostatic cool pressing is processed through excess pressure again;
(5) with the pressed compact vacuum-sintering after step (4) is processed, more tempered processing, magnet made.
2. prepare as claimed in claim 1 the method for low weightless rare-earth-iron-boron permanent magnet, it is characterized in that: in step (1).
3. prepare as claimed in claim 1 the method for low weightless rare-earth-iron-boron permanent magnet, it is characterized in that: in step (1), described liquid phase alloy is prepared into through airflow milling the fine powder that particle mean size is 1-5 μ m, and Nd Fe B alloys is prepared into through airflow milling the fine powder that particle mean size is 3-6 μ m.
4. prepare as claimed in claim 1 the method for low weightless rare-earth-iron-boron permanent magnet, it is characterized in that: in step (2), described nanometer Zn powder size is 1-200nm, and the weight ratio of nanometer Zn powder and antioxidant is 1:1-3.
5. prepare as claimed in claim 1 the method for low weightless rare-earth-iron-boron permanent magnet, it is characterized in that: in step (3), the adding proportion of described compound liquid phase powder is the 0.5%-2.0% of neodymium iron boron powder weight.
6. prepare as claimed in claim 1 the method for low weightless rare-earth-iron-boron permanent magnet, it is characterized in that: the described antioxidant that contains nanometer Zn powder accounts for the 30%-70% of compound liquid phase grain weight amount.
7. prepare as claimed in claim 1 the method for low weightless rare-earth-iron-boron permanent magnet, it is characterized in that: in step (4), the intensity of alignment magnetic field is 1.0-2.0T.
8. the method for the low weightless rare-earth-iron-boron permanent magnet of preparation as claimed in claim 1 is characterized in that: in step (5), pressed compact 1000 ℃-1200 ℃ vacuum-sintering 4-6 hour.
9. as the method for the low weightless rare-earth-iron-boron permanent magnet of preparation as described in claim 1-8 any one, it is characterized in that: the described temper of step (5) is prior to 880 ℃ of-920 ℃ of one-level tempering 2-4 hour, and then processes 4-6 hour in 450 ℃ of-600 ℃ of second annealings.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822252A (en) * | 2006-03-30 | 2006-08-23 | 上海大学 | Temperature pressure binding permanent magnet material and its preparing method |
| CN101615461A (en) * | 2009-05-14 | 2009-12-30 | 浙江大学 | Nanometer Zn crystal boundary modified high-corrosion resistance Sintered NdFeB magnet and preparation method thereof |
| CN102031052A (en) * | 2009-09-29 | 2011-04-27 | 沈阳刘后地电镀有限公司 | Neodymium iron boron rare earth permanent magnet surface coating and application method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1822252A (en) * | 2006-03-30 | 2006-08-23 | 上海大学 | Temperature pressure binding permanent magnet material and its preparing method |
| CN101615461A (en) * | 2009-05-14 | 2009-12-30 | 浙江大学 | Nanometer Zn crystal boundary modified high-corrosion resistance Sintered NdFeB magnet and preparation method thereof |
| CN102031052A (en) * | 2009-09-29 | 2011-04-27 | 沈阳刘后地电镀有限公司 | Neodymium iron boron rare earth permanent magnet surface coating and application method thereof |
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