CN112331470A - Neodymium-iron-boron magnetic steel and preparation method thereof - Google Patents
Neodymium-iron-boron magnetic steel and preparation method thereof Download PDFInfo
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- CN112331470A CN112331470A CN202011219144.8A CN202011219144A CN112331470A CN 112331470 A CN112331470 A CN 112331470A CN 202011219144 A CN202011219144 A CN 202011219144A CN 112331470 A CN112331470 A CN 112331470A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
- H01F41/0266—Moulding; Pressing
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/047—Alloys characterised by their composition
- H01F1/053—Alloys characterised by their composition containing rare earth metals
- H01F1/055—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5
- H01F1/057—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B
- H01F1/0571—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes
- H01F1/0575—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together
- H01F1/0577—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and IIIa elements, e.g. Nd2Fe14B in the form of particles, e.g. rapid quenched powders or ribbon flakes pressed, sintered or bonded together sintered
Abstract
The application relates to the field of permanent magnet materials, and particularly discloses neodymium iron boron magnetic steel and a preparation method thereof. The neodymium iron boron magnetic steel comprises the following components in percentage by weight: 18% -29% of Nd; b is 0.8% -0.95%; ga 0.15% -0.3%; mo is 0.55% -0.75%; 3.5% -4.1% of Ce; sb2O30.2% -0.35%; 0.15% -0.4% of graphene; the balance being Fe and unavoidable impurities. The preparation method comprises the following steps: smelting, melt-spinning, hydrogen crushing, grinding into powder, orientation forming, static pressure, sintering and grinding to obtain the neodymium-iron-boron magnetic steel. This application has when making neodymium iron boron magnetic steel have good magnetic property, improves neodymium iron boron magnetic steel's corrosion resisting property's advantage.
Description
Technical Field
The application relates to the field of permanent magnet materials, in particular to neodymium iron boron magnetic steel and a preparation method thereof.
Background
The neodymium iron boron permanent magnet material belongs to one of rare earth permanent magnet materials, is the material with the highest magnetic performance in the rare earth permanent magnet materials, has the advantages of energy conservation, high efficiency, system compatibility, convenient operation, high reliability and the like, is gradually adopted in a plurality of emerging fields under the concept of global advocation of energy conservation and environmental protection, and is widely applied to various new technology preparation industries.
The neodymium iron boron permanent magnet material is a permanent magnet material based on an intermetallic compound Nd-Fe-B, the neodymium iron boron is divided into two types of sintered neodymium iron boron and bonded neodymium iron boron, the sintered neodymium iron boron permanent magnet material has excellent magnetic performance and is widely applied to the fields of electronics, electric power machinery and medical appliances, but the sintered neodymium iron boron permanent magnet material is easy to corrode, and the actual working performance of the sintered neodymium iron boron permanent magnet material is influenced.
In order to improve the corrosion resistance of the sintered neodymium iron boron, researches indicate that one or two of Ta, V, Ti and Al are added into the sintered neodymium iron boron to reduce a rare earth-rich phase on a grain boundary, so that the corrosion resistance of the grain boundary and the whole sintered neodymium iron boron can be improved.
However, the crystal phase formed after the addition of Ta, V, Ti and Al can cause the magnetic properties such as remanence and coercive force of the neodymium iron boron to be greatly reduced, and the actual working performance of the neodymium iron boron can also be caused.
Disclosure of Invention
In order to enable the neodymium iron boron magnetic steel to have good magnetic performance and improve the corrosion resistance of the neodymium iron boron magnetic steel, the application provides the neodymium iron boron magnetic steel and a preparation method thereof.
First aspect, this application provides a neodymium iron boron magnetic steel, adopts following technical scheme:
the neodymium iron boron magnetic steel comprises the following components in percentage by weight:
Nd 18%~29%；
B 0.8%~0.95%；
Ga 0.15%~0.3%；
Mo 0.55%~0.75%；
Ce 3.5%~4.1%；
Sb2O3 0.2%~0.35%；
0.15% -0.4% of graphene;
the balance being Fe and unavoidable impurities.
By adopting the technical scheme, Sb2O3The addition of the graphene improves the corrosion resistance of the NdFeB magnet steel, improves the mechanical property of the NdFeB magnet steel and reduces Sb2O3Influence on mechanical properties of NdFeB magnet, and Sb2O3The addition of the magnetic material can reduce the residual magnetism and coercive force of the neodymium iron boron magnetic steel greatly caused by the addition of the non-magnetic phase, so that the neodymium iron boron magnetic steel has good magnetic performance and the corrosion resistance of the neodymium iron boron magnetic steel is improved.
Preferably, the neodymium iron boron magnetic steel comprises the following components in percentage by weight:
Nd 23%~25%；
B 0.8%~0.85%；
Ga 0.2%~0.3%；
Mo 0.60%~0.65%；
Ce 3.8%~4.0%；
Sb2O3 0.30%~0.35%；
0.2% -0.25% of graphene;
the balance being Fe and unavoidable impurities.
By adopting the technical scheme, the neodymium iron boron magnetic steel obtained by the proportioning has better magnetic property and good corrosion resistance.
Preferably, the graphene is graphene oxide.
By adopting the technical scheme, the graphene oxide has large surface energy, is easy to combine with the neodymium iron boron crystal phase, and improves the mechanical property of the neodymium iron boron magnetic steel.
Preferably, the graphene oxide is modified graphene oxide, and the preparation method of the modified graphene oxide comprises the following steps: adding a dispersing agent into purified water, then adding a mixture of graphene oxide and nano niobium powder, stirring, dropwise adding a tackifier, filtering after stirring, drying a filtered solid, and then carrying out heat treatment on the solid for 3-5 hours under a vacuum condition at the heat treatment temperature of 500-600 ℃ to obtain the modified graphene oxide.
Through adopting above-mentioned technical scheme, compound niobium to graphene oxide, improve the stability of graphene oxide in the neodymium iron boron crystal phase, further improve mechanical properties, make neodymium iron boron magnetic steel's magnetic property have further improvement simultaneously.
Preferably, the weight ratio of the graphene oxide to the nano niobium powder to the dispersing agent to the tackifier to the purified water is 5 (0.88-1.11) to (1.3-1.5) to (8.6-9.2) to (100-150).
By adopting the technical scheme, the niobium powder can be better compounded on the graphene oxide according to the proportion.
Preferably, the dispersant is ammonium polymethacrylate.
By adopting the technical scheme, the ammonium polymethacrylate can improve the dispersibility of the graphene oxide and the niobium powder in water and reduce the agglomeration of the graphene oxide and the niobium powder.
Preferably, the viscosity increasing agent is polyethylene glycol 200.
By adopting the technical scheme, the polyethylene glycol is beneficial to the combination of the niobium powder on the graphene oxide and the formation of the modified graphene oxide.
Preferably, the particle size range of the nano niobium powder is 50-100 nm.
By adopting the technical scheme, the niobium powder has small particle size, can be better combined with the graphene oxide, and is beneficial to improving the stability of the graphene oxide in the crystal phase of the neodymium iron boron magnetic steel in the crystal lattice in which niobium can more easily enter.
Preferably, the average sheet diameter of the graphene oxide is 50 μm.
By adopting the technical scheme, the graphene oxide has a large sheet diameter while keeping a micron level, provides a space for combination with niobium powder, and is beneficial to formation of modified graphene oxide.
In a second aspect, the present application provides a method for preparing neodymium iron boron magnetic steel, which adopts the following technical scheme:
a preparation method of neodymium iron boron magnetic steel comprises the following steps:
s1, under the protection of inert gas, smelting raw materials of neodymium iron boron magnetic steel, and then carrying out melt-spinning to obtain a melt-spun sheet;
s2, carrying out hydrogen crushing on the melt-spun piece, and then grinding into powder to obtain neodymium iron boron powder;
s3, under the protection of inert gas, placing the neodymium iron boron powder in a magnetic field, carrying out orientation forming, and then carrying out static pressure to obtain a green body;
s4, sintering the green body under a vacuum condition to obtain a sintered magnet;
and S5, grinding the sintered magnet according to the designed shape to obtain the neodymium iron boron magnetic steel.
By adopting the technical scheme, the raw materials of the neodymium iron boron magnetic steel are fully mixed by smelting, and Sb2O3And the uniformity of the distribution of the graphene in the neodymium iron boron crystal phase is improved, so that the magnetic property, the corrosion resistance and the mechanical property of the neodymium iron boron magnetic steel are improved.
In summary, the present application has the following beneficial effects:
1. since the graphene and Sb are added in the method2O3In the mode (2), the mechanical property of the neodymium-iron-boron magnetic steel is improved by the graphene, and Sb is2O3Improves the corrosion resistance of the Nd-Fe-B magnetic steel, and Sb2O3The addition of the magnetic material can greatly reduce the remanence and the coercive force of the neodymium iron boron magnetic steel due to the reduction of the addition of the non-magnetic phase, so that the neodymium iron boron magnetic steel has good magnetic performance and the corrosion resistance of the neodymium iron boron magnetic steel is improved.
2. The optimized modified graphene oxide that adopts in this application, modified graphene oxide is obtained by niobium powder and graphite alkene combination, not only can further improve mechanical properties, makes neodymium iron boron magnetic steel's magnetic property have further improvement simultaneously.
3. According to the method, the raw materials of the neodymium iron boron magnetic steel are fully mixed through smelting, so that Sb is improved2O3And the uniformity of the distribution of the graphene in the neodymium iron boron crystal phase further improves the magnetic property, the corrosion resistance and the mechanical property of the neodymium iron boron magnetic steel.
Detailed Description
The present application is further described in detail in connection with the following examples.
The graphene is selected from Qingdao rock sea carbon material Co., Ltd, and has an average sheet diameter of 50 μm;
the graphene oxide is selected from Qingdao rock-ocean carbon materials Co., Ltd, and has an average sheet diameter of 50 μm;
the nano niobium powder is selected from Shanghai Naiyou nano technology Limited company, and has a particle size of 50-100 nm.
Preparation example of modified graphene oxide
Preparation example 1
Taking a reaction bottle, adding 100g of purified water and 1.4g of ammonium polymethacrylate into the reaction bottle, stirring for 5min, then mixing 5g of graphene oxide and 0.88g of nano niobium powder, then adding the mixture of the graphene oxide and the nano niobium powder into the reaction bottle, dropwise adding 9.2g of polyethylene glycol 200, after dropwise addition within 10min, continuing stirring for 1h at 40 ℃, filtering after stirring, drying the filtered solid in a vacuum oven at 60 ℃, then placing the solid in a muffle furnace for heat treatment for 3h under the protection of argon, wherein the heat treatment temperature is 600 ℃, and naturally cooling after heat treatment, thus obtaining the modified graphene oxide.
Preparation example 2
Taking a reaction bottle, adding 150g of purified water and 1.5g of ammonium polymethacrylate into the reaction bottle, stirring for 5min, then mixing 5g of graphene oxide and 1g of nano niobium powder, then adding the mixture of the graphene oxide and the nano niobium powder into the reaction bottle, dropwise adding 9.2g of polyethylene glycol 200, after dropwise addition within 10min, continuing stirring for 1h at 40 ℃, filtering after stirring, drying the filtered solid in a vacuum oven at 60 ℃, then placing the solid in a muffle furnace for heat treatment for 5h under the protection of argon, wherein the heat treatment temperature is 500 ℃, and naturally cooling after heat treatment is finished to obtain the modified graphene oxide.
Preparation example 3
Taking a reaction bottle, adding 100g of purified water and 1.3g of ammonium polymethacrylate into the reaction bottle, stirring for 5min, then mixing 5g of graphene oxide and 1.11g of nano niobium powder, then adding the mixture of the graphene oxide and the nano niobium powder into the reaction bottle, dropwise adding 8.9g of polyethylene glycol 200, after dropwise adding within 10min, continuing stirring for 1h at 40 ℃, filtering after stirring, drying the filtered solid in a vacuum oven at 60 ℃, then placing the solid in a muffle furnace for heat treatment for 5h under the protection of argon, wherein the heat treatment temperature is 600 ℃, and naturally cooling after the heat treatment is finished to obtain the modified graphene oxide.
Examples
Example 1
The neodymium iron boron magnetic steel comprises the following components in percentage by weight:
Nd 180g；
B 9.5g；
Ga 1.5g；
Mo 7.5g；
Ce 41g；
Sb2O3 2g；
1.5g of graphene;
Fe 735g。
a preparation method of neodymium iron boron magnetic steel comprises the following steps:
s1, mixing Nd, B, Ga, Mo, Ce and Sb according to the proportion of the components2O3Putting the graphene and the Fe into a smelting furnace, heating the smelting furnace to 1100 ℃ under the protection of helium, smelting for 5 hours to obtain molten liquid, and adding the molten liquid into a rapid hardening melt-spun machine for rapid cooling to obtain a melt-spun sheet;
s2, adding the melt-spun sheet into a hydrogen breaking tank, heating the hydrogen breaking tank to 75 ℃, introducing hydrogen, carrying out hydrogen absorption breaking on the melt-spun sheet, then carrying out dehydrogenation, adding the melt-spun sheet into an airflow mill, and grinding the melt-spun sheet into powder with the average particle size of 2.5 microns to obtain neodymium iron boron powder;
s3, under the protection of nitrogen, neodymium iron boron powder is placed in a die of a magnetic field forming press, the forming orientation magnetic field is 2T, and pressing is carried out for 120s, so that a green body is obtained;
s4, placing the green body in a sintering furnace, sintering for 4 hours under a vacuum condition at a sintering temperature of 1080 ℃ to obtain a sintered magnet;
and S5, grinding the sintered magnet according to the designed shape to obtain the neodymium iron boron magnetic steel.
Examples 2 to 4
Examples 2 to 4 differ from example 1 only in the different proportions of ndfeb magnet, as shown in table 1.
TABLE 1
| Example 2 | Example 3 | Example 4 | |
| Nd(g) | 290 | 230 | 250 |
| B(g) | 9 | 8.5 | 8 |
| Ga(g) | 3 | 2 | 2.5 |
| Mo(g) | 5.5 | 6 | 6.5 |
| Ce(g) | 35 | 38 | 40 |
| Sb2O3(g) | 2.5 | 3.5 | 3 |
| Graphene (g) | 4 | 2 | 2.5 |
| Fe(g) | 623 | 686 | 664.5 |
Example 5
This example differs from example 4 only in that the same amount of graphene oxide was used instead of graphene.
Example 6
This example differs from example 5 only in that the modified graphene oxide obtained in preparation example 1 was used in place of graphene oxide in an equal amount.
Example 7
This example differs from example 5 only in that the modified graphene oxide obtained in preparation example 2 was used in place of graphene oxide in an equal amount.
Example 8
This example differs from example 5 only in that the modified graphene oxide obtained in preparation example 3 was used in place of graphene oxide in an equal amount.
Comparative example
Comparative example 1
This comparative example differs from example 4 only in that Sb was replaced by the same amount of Fe2O3And graphene.
Comparative example 2
The difference between the comparative example and the embodiment 4 is only that the components and the mixture ratio of the ndfeb magnet steel in the comparative example are different, and the components and the mixture ratio of the ndfeb magnet steel in the comparative example are as follows:
Nd 180g；
B 9.5g；
Ga 1.5g；
Mo 7.5g；
Ce 41g；
V 3g；
Al 2.5g；
Fe 664.5g。
comparative example 3
The difference between the comparative example and the embodiment 4 is only that the components and the mixture ratio of the ndfeb magnet steel in the comparative example are different, and the components and the mixture ratio of the ndfeb magnet steel in the comparative example are as follows:
Nd 180g；
B 9.5g；
Ga 1.5g；
Mo 7.5g；
Ce 41g；
Ta 3g；
Ti 2.5g；
Fe 664.5g。
comparative example 4
This comparative example differs from example 4 only in that Sb was replaced by the same amount of Fe2O3。
Comparative example 5
The present comparative example differs from example 4 only in that the graphene is replaced with an equal amount of Fe.
Comparative example 6
This comparative example differs from example 4 only in that Sb2O3The amount of (3) added was 4.5g, and the amount of Fe added was 663 g.
Performance test
The neodymium iron boron magnetic steel obtained in each embodiment and comparative example of the application is made into a test piece with the diameter of D10 multiplied by 10mm, the test piece is placed in a saturated vapor atmosphere with the temperature of 120 ℃, the atmospheric pressure of 2 and the relative humidity of 100 percent to be corroded for 960 hours, the weight of the test piece is tested, the weight loss rate is calculated, and the calculation formula of the weight loss rate is as follows: (weight before test-weight after test)/surface area of the test piece, and the test results are shown in Table 2.
According to GBT 3217-.
According to GB/T31967.2-2015 method for testing physical properties of rare earth permanent magnet materials part 2: measurement of flexural strength and fracture toughness, the bending strength test was performed on the ndfeb magnet steel obtained in each example and comparative example of the present application, and the test results are shown in table 2.
TABLE 2
| Weight loss ratio (mg/cm)2) | Remanence (T) | Coercive force (KOe) | Bending strength (MPa) | |
| Example 1 | 2.54 | 1.207 | 11.3 | 150 |
| Example 2 | 2.57 | 1.204 | 11.28 | 147 |
| Example 3 | 2.47 | 1.205 | 11.31 | 148 |
| Example 4 | 2.42 | 1.208 | 11.32 | 152 |
| Example 5 | 2.45 | 1.211 | 11.3 | 176 |
| Example 6 | 2.43 | 1.288 | 11.86 | 206 |
| Example 7 | 2.45 | 1.283 | 11.85 | 205 |
| Example 8 | 2.41 | 1.286 | 11.89 | 208 |
| Comparative example 1 | 4.56 | 1.302 | 12.08 | 153 |
| Comparative example 2 | 2.75 | 1.023 | 10.27 | 158 |
| Comparative example 3 | 2.68 | 1.086 | 10.58 | 162 |
| Comparative example 4 | 4.44 | 1.215 | 11.45 | 182 |
| Comparative example 5 | 2.53 | 1.292 | 11.99 | 132 |
| Comparative example 6 | 2.28 | 1.134 | 10.88 | 150 |
According to Table 2, the composition of the NdFeB magnet based on comparative example 1 without Sb addition2O3And graphene, wherein the comparative example 2 is to add V and Al to the basic neodymium iron boron magnetic steel component, and the comparative example 3 is to add Ta and Ti to the basic neodymium iron boron magnetic steel component, and test results of the three show that the weight loss ratios of the comparative example 2 and the comparative example 3 are both smaller than that of the comparative example 1, but the remanence and the coercive force are also greatly reduced, which shows that the V, the Al, the Ta and the Ti can improve the corrosion resistance of the neodymium iron boron magnetic steel, but can influence the magnetic performance of the neodymium iron boron magnetic steel.
Examples 1-4 addition of Sb to the basic NdFeB magnet composition2O3Compared with the comparative example 1, the weight loss ratio of the neodymium iron boron magnetic steel prepared in the examples 1 to 4 is smaller than that of the comparative example 1, and the graphene is added, so that the weight loss ratio of the neodymium iron boron magnetic steel is larger than that of the comparative example 1, and the balance is obtainedThe reduction of the magnetic and coercive forces compared with comparative example 1 is smaller than that of comparative example 2 and comparative example 3, and the magnetic properties reflected by the remanence and coercive forces are better, probably because Sb is2O3The crystal phase generated after the neodymium is added can be combined with the neodymium-rich phase, so that the neodymium-rich phase is not easy to lose electrons, the chemical property of the neodymium-rich phase is more stable, and the corrosion resistance of the neodymium-iron-boron magnetic steel is improved; in addition, Sb2O3After the neodymium-rich phase is added, the proportion of the neodymium-rich phase existing between the main crystal phases in a thin layer form is increased, so that the reduction of remanence and coercive force is small, and therefore, the neodymium-iron-boron magnetic steel prepared in the embodiments 1-4 of the application has good magnetic performance and the corrosion resistance of the neodymium-iron-boron magnetic steel is improved.
Comparative example 4 with graphene and no Sb in the NdFeB magnet composition2O3Compared with the embodiment 4, the weight loss ratio of the neodymium iron boron magnetic steel prepared in the embodiment 4 is smaller than that of the comparative example 4, and the bending strength is smaller than that of the comparative example 4; comparative example 5 is Nd-Fe-B magnet steel with Sb2O3The weight loss rate of the neodymium iron boron magnetic steel prepared in the embodiment 4 is not much different from that of the comparative example 5, and the bending strength is larger than that of the comparative example 5; in addition, the bending strength of example 4 is not much different from that of comparative example 1, which shows that Sb2O3The mechanical property of the neodymium iron boron magnetic steel can be reduced by adding the graphene, and the defect can be overcome by adding the graphene, so that the mechanical property of the neodymium iron boron magnetic steel is maintained.
Comparative example 6 is Sb2O3The addition amount of the alloy exceeds the range of 0.2-0.35 percent of the total content of the neodymium-iron-boron magnetic steel, compared with the embodiment 4, the remanence and the coercive force of the comparative example 6 are greatly reduced compared with those of the comparative example 1, which shows that Sb2O3The magnetic performance of the neodymium iron boron magnetic steel is greatly influenced by excessive addition of the magnetic steel.
The graphene oxide is added in the embodiment 5, and compared with the embodiment 4, the bending strength of the neodymium iron boron magnetic steel prepared in the embodiment 5 is higher, probably because the graphene oxide has large surface energy and is easily combined with a neodymium iron boron crystal phase, so that the mechanical property of the neodymium iron boron magnetic steel is improved.
Examples 6 to 8 were carried out by adding modified graphene oxide compounded with niobium powderCompared with example 5, the neodymium-iron-boron-magnetic steel prepared in examples 6-8 has higher bending strength, probably because when the niobium powder is compounded on the graphene oxide, part of niobium enters Sb2O3In the crystal lattice of (1), because of Sb2O3The crystal lattices are distributed in the neodymium iron boron crystal phase, so that the combination of the graphene oxide and the neodymium iron boron crystal phase is more stable, and the mechanical property of the neodymium iron boron magnetic steel is further improved.
In addition, in comparison with comparison example 1, when comparison example 4 and example 5 are combined, the magnetic performance of the ndfeb magnet steel is reduced due to the independent addition of the graphene oxide, and the remanence and the coercive force of the ndfeb magnet steel prepared in examples 6 to 8 are higher than those of comparison example 4 and example 5, which may be caused by the fact that after the niobium powder is compounded in the graphene oxide, the influence of the graphene oxide on the magnetic performance of the ndfeb magnet steel can be reduced, so that better magnetic performance can be obtained.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. The neodymium iron boron magnetic steel is characterized by comprising the following components in percentage by weight:
Nd 18%~29%；
B 0.8%~0.95%；
Ga 0.15%~0.3%；
Mo 0.55%~0.75%；
Ce 3.5%~4.1%；
Sb2O3 0.2%~0.35%；
0.15% -0.4% of graphene;
the balance being Fe and unavoidable impurities.
2. The ndfeb magnetic steel of claim 1, wherein: the composition comprises the following components in percentage by weight:
Nd 23%~25%；
B 0.8%~0.85%；
Ga 0.2%~0.3%；
Mo 0.60%~0.65%；
Ce 3.8%~4.0%；
Sb2O3 0.30%~0.35%；
0.2% -0.25% of graphene;
the balance being Fe and unavoidable impurities.
3. The ndfeb magnetic steel of claim 1, wherein: the graphene is graphene oxide.
4. A ndfeb magnet according to claim 3, wherein: the graphene oxide is modified graphene oxide, and the preparation method of the modified graphene oxide comprises the following steps: adding a dispersing agent into purified water, then adding a mixture of graphene oxide and nano niobium powder, stirring, dropwise adding a tackifier, filtering after stirring, drying a filtered solid, and then carrying out heat treatment on the solid for 3-5 hours under a vacuum condition at the heat treatment temperature of 500-600 ℃ to obtain the modified graphene oxide.
5. A neodymium iron boron magnetic steel according to claim 4, characterized in that: the weight ratio of the graphene oxide to the nano niobium powder to the dispersing agent to the tackifier to the purified water is 5 (0.88-1.11) to (1.3-1.5) to (8.6-9.2) to (100-150).
6. A neodymium iron boron magnetic steel according to claim 4, characterized in that: the dispersant is ammonium polymethacrylate.
7. A neodymium iron boron magnetic steel according to claim 4, characterized in that: the tackifier is polyethylene glycol 200.
8. A neodymium iron boron magnetic steel according to claim 4, characterized in that: the particle size range of the nano niobium powder is 50-100 nm.
9. A ndfeb magnet according to claim 3, wherein: the average sheet diameter of the graphene oxide is 50 μm.
10. A preparation method of neodymium iron boron magnetic steel is characterized by comprising the following steps: the method comprises the following steps:
s1, under the protection of inert gas, smelting raw materials of neodymium iron boron magnetic steel, and then carrying out melt-spinning to obtain a melt-spun sheet;
s2, carrying out hydrogen crushing on the melt-spun piece, and then grinding into powder to obtain neodymium iron boron powder;
s3, under the protection of inert gas, placing the neodymium iron boron powder in a magnetic field, carrying out orientation forming, and then carrying out static pressure to obtain a green body;
s4, sintering the green body under a vacuum condition to obtain a sintered magnet;
and S5, grinding the sintered magnet according to the designed shape to obtain the neodymium iron boron magnetic steel.
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| CN202011219144.8A Active CN112331470B (en) | 2020-11-04 | 2020-11-04 | Neodymium iron boron magnetic steel and preparation method thereof |
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| US20100021985A1 (en) * | 2007-03-20 | 2010-01-28 | The Regents Of The University Of California | Mechanical process for creating particles in fluid |
| CN103212714A (en) * | 2013-04-27 | 2013-07-24 | 安徽大地熊新材料股份有限公司 | Method for preparing neodymium iron boron material |
| CN103632791A (en) * | 2013-12-19 | 2014-03-12 | 江苏南方永磁科技有限公司 | High-coercivity neodymium-iron-boron permanent-magnet material and preparation method thereof |
| CN108914042A (en) * | 2018-07-06 | 2018-11-30 | 安徽大地熊新材料股份有限公司 | A kind of preparation method of wear-and corrosion-resistant Sintered NdFeB magnet |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20100021985A1 (en) * | 2007-03-20 | 2010-01-28 | The Regents Of The University Of California | Mechanical process for creating particles in fluid |
| CN103212714A (en) * | 2013-04-27 | 2013-07-24 | 安徽大地熊新材料股份有限公司 | Method for preparing neodymium iron boron material |
| CN103632791A (en) * | 2013-12-19 | 2014-03-12 | 江苏南方永磁科技有限公司 | High-coercivity neodymium-iron-boron permanent-magnet material and preparation method thereof |
| CN108914042A (en) * | 2018-07-06 | 2018-11-30 | 安徽大地熊新材料股份有限公司 | A kind of preparation method of wear-and corrosion-resistant Sintered NdFeB magnet |
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