CN112086255A - High-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet and preparation method thereof - Google Patents
High-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet and preparation method thereof Download PDFInfo
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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
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- 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
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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
- 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
- H01F41/0293—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 diffusion of rare earth elements, e.g. Tb, Dy or Ho, into permanent magnets
Abstract
The application discloses high coercivity, high temperature resistant sintered neodymium iron boron magnet and preparation method thereof, main looks alloy coarse grain through preparation sintered neodymium iron boron magnet, the grain boundary of preparation sintered neodymium iron boron magnet adds looks coarse grain, will the grain boundary add looks coarse grain the main looks alloy coarse grain mixes, after the misce bene the grain boundary add looks coarse grain the main looks alloy coarse grain grinds into the magnetic powder add in the magnetic powder after adding the additive and mixing carry out orientation shaping and static pressure and make into the unburned bricks, it is right the unburned bricks obtain high coercivity, high temperature resistant sintered neodymium iron boron magnet after sintering heat preservation is handled, heat treatment. The preparation method of the high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet can achieve further magnetic hardening of the surface of the crystal grains, reconstructs a grain boundary organization structure, further improves the coercivity, reduces magnetic dilution of the magnet, is simple in manufacturing process equipment, is convenient to operate, and is suitable for large-scale industrial production.
Description
Technical Field
The application relates to the technical field of rare earth permanent magnet materials, in particular to a high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet and a preparation method thereof.
Background
The rare earth permanent magnetic material is a high-performance material formed by rare earth elements (Pr, Nd, Sm and the like) and transition group metals M (Fe, Co and the like). Since the advent of the third generation rare earth permanent magnet sintered neodymium iron boron called "maga", it has advantages of good magnetic properties, low price, small thermal expansion coefficient and easy processing, and meets the development requirements of modern materials of light weight, thinness, shortness and smallness, and is widely applied to the fields of electronic information, medical treatment, wind power generation, transportation, aerospace and the like. At present, the maximum remanence of sintered neodymium iron boron can be 1.55T, which is 96% of a theoretical value, but the coercive force is only 1/6-1/3% of the theoretical value, and the requirements of fields with higher working temperature, such as wind power generation, new energy automobiles and the like, cannot be met.
At present, the coercive force of the sintered Nd-Fe-B permanent magnet is improved at home and abroad mainly by improving the anisotropy field H of the crystalAAnd optimizing the structure of the grain boundary. In the actual production process, two process modes are generally adopted: one is that heavy rare earth elements are added during smelting, namely a great amount of heavy rare earth elements such as Dy, Tb and the like are added during smelting, the direct adding mode greatly improves the cost, not only consumes rare heavy rare earth strategic resources, but also reduces the remanence and the magnetic energy product of the magnet due to the antiferromagnetic coupling effect between Dy/Tb and Fe atoms; the other is grain boundary diffusion, namely, the heavy rare earth element permeates to the surface of the magnet by surface treatment methods such as sputtering, surface coating and the like to play a role in surface magnetic hardening, and meanwhile, the heavy rare earth element cannot enter the main phase alloy too much to cause obvious magnetic dilution. CN101404195B discloses a grain boundary diffusion method, i.e. arranging a compound containing rare earth elements on the surface of a magnet in vacuum or inert gas, and heat-treating the magnet at a temperature lower than the sintering temperature, which can greatly improve the coercive force and has small remanence loss, but the method has complex process operation, is only suitable for small magnets and is not suitable for industrial mass production.
Therefore, how to provide a method suitable for mass production of high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnets is a problem to be solved by those skilled in the art.
Disclosure of Invention
In order to solve the technical problems, the application provides a high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet and a preparation method thereof, and the magnet is suitable for mass production.
The technical scheme provided by the application is as follows:
the application provides a preparation method of a high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet, which comprises the following steps: preparing coarse particles of main phase alloy of the sintered neodymium-iron-boron magnet; preparing coarse grain of a grain boundary additive phase of the sintered neodymium-iron-boron magnet; mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles; grinding the uniformly mixed grain boundary additive phase coarse particles and the main phase alloy coarse particles into magnetic powder; adding additives into the magnetic powder, mixing, and then carrying out orientation forming and static pressure to prepare a green body; sintering and heat-preserving the green body to obtain a sintered neodymium-iron-boron magnet blank; and carrying out heat treatment on the sintered neodymium iron boron magnet blank to obtain a high-coercivity and high-temperature-resistant sintered neodymium iron boron magnet.
Further, in a preferred embodiment of the present invention, the step "preparing coarse particles of main phase alloy of sintered nd-fe-b magnet" specifically includes: according to a high magnetocrystalline anisotropy field HAThe main phase alloy components are proportioned, an alloy melt-spun sheet with the thickness of 0.25-0.45 mm is obtained by adopting a rapid-hardening sheet casting technology, and the main phase alloy coarse particles are prepared after hydrogen breaking.
Further, in a preferred embodiment of the present invention, the main phase alloy specifically includes: [ (PrNd)100- xRex]aFe100-a-b-cBbMcWherein Re is one or more of heavy rare earth elements Dy, Tb, Ho, Gd, Er, Yb, Tm and Lu, M is one or more of Al, Cu, Co, Zr, Nb, Ga, Mg, Si, Ti, Mo and Mn, x is more than or equal to 1 and less than or equal to 100, a is more than or equal to 29.1 and less than or equal to 40, b is more than or equal to 0.9 and less than or equal to 1.1, and z is more than or equal to 0.5 and less than or equal to 2.5.
Further, in a preferred embodiment of the present invention, the step "preparing coarse grains of grain boundary additive phase of sintered nd-fe-b magnet" specifically includes: cutting Re or (Re) H into small squares with the diameter of about 1-3cm by a shearing machine, and preparing the grain boundary additive phase coarse particles after hydrogen breaking, wherein Re in the Re or (Re) H is one or more of heavy rare earth elements Dy, Tb, Ho, Gd, Er, Yb, Tm and Lu.
Further, in a preferred embodiment of the present invention, the step of "mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles" is specifically: adding the grain boundary additive phase coarse particles into the main phase alloy coarse particles in proportion, and mixing the grain boundary additive phase coarse particles with the main phase alloy coarse particles, wherein the addition proportion of the grain boundary additive phase coarse particles is as follows: the addition amount of the grain boundary additive phase coarse particles accounts for 0.05-2% of the total mass of the main phase alloy coarse particles and the grain boundary additive phase coarse particles.
Further, in a preferred embodiment of the present invention, the step of mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles and then grinding the mixture into a magnetic powder specifically includes: and mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles, and then carrying out air flow grinding treatment to obtain the magnetic powder with the average grain size of 2.7-4.5 mu m.
Further, in a preferred mode of the present invention, the step of "adding additives to the magnetic powder, mixing, orientation molding and static pressing to form a green compact" is specifically: and adding an additive into the magnetic powder, mixing, carrying out orientation forming under a magnetic field of 1.6-2.0, and carrying out isostatic pressing under 19MPa to prepare the green body.
Further, in a preferred mode of the present invention, the step of "performing sintering heat preservation treatment on the green compact" specifically includes: and sintering and heat-preserving the green body at the temperature of 1040-1100 ℃, wherein the heat-preserving time is 3-7 h.
Preferably, the green body is subjected to sintering heat preservation treatment in a vacuum sintering furnace.
Further, in a preferred embodiment of the present invention, the heat treatment of the sintered nd-fe-b magnet blank specifically includes: performing primary heat treatment at 850-930 ℃ for 2-4 h, and performing secondary heat treatment at 450-550 ℃ for 3-6 h.
The application also provides a high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet which is prepared by adopting the preparation method.
Compared with the prior art, the preparation method of the high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet provided by the invention comprises the following steps: preparing coarse particles of main phase alloy of the sintered neodymium-iron-boron magnet; preparation of sintered NeodymiumAdding coarse grains into the grain boundary of the ferroboron magnet; mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles; grinding the uniformly mixed grain boundary additive phase coarse particles and the main phase alloy coarse particles into magnetic powder; adding additives into the magnetic powder, mixing, and then carrying out orientation forming and static pressure to prepare a green body; sintering and heat-preserving the green body to obtain a sintered neodymium-iron-boron magnet blank; right the sintered Nd-Fe-B magnet blank obtains high coercivity, high temperature resistant sintered Nd-Fe-B magnet after carrying out heat treatment, and this application adopts to have high magnetocrystalline anisotropy field HAThe main phase alloy component improves the content of Re2Fe14B in the magnet, ensures the residual magnetization Br and the high magnetic energy product (BH) max of the magnet, and Re or (Re) H can reset the grain boundary structure of the sintered neodymium iron boron, and further improves the coercive force of the magnet under the condition of ensuring that the residual magnetism of the magnet cannot be greatly reduced.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions will be clearly and completely described below in conjunction with the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
1) According to mass percentage, for a main phase alloy A: (PrNd)29.1Dy2.5Al0.28Cu0.22Co1.0Ga0.15Nb0.25B0.95Fe66.05，B：(PrNd)29.1Dy3.0Al0.28Cu0.22Co1.0Ga0.15Nb0.25B0.95Fe66.05Respectively burdening, smelting the prepared raw materials, preparing alloy sheets with the thickness of 0.25-0.45 mm by a rapid hardening and strip throwing furnace, and preparing coarse particles after hydrogen breaking;
2) cutting the metal dysprosium into small squares of 1-3cm, and preparing coarse particles DyH/Dy after hydrogen breaking;
3) equally dividing coarse particles prepared from a main phase alloy A into two parts, namely A1 and A2, adding 0.5% DyH/Dy powder into A2, then adding 1.2 per thousand of antioxidant into A1, A2 and B respectively, uniformly mixing, grinding by airflow to obtain alloy magnetic powder with the average particle size of about 3.0 mu m, adding 0.8 per thousand of lubricant, uniformly mixing, carrying out orientation molding under a 1.9T magnetic field, and carrying out isostatic pressing under 19MPa to obtain a green body;
4) and (3) sintering the green body in a vacuum sintering furnace at the sintering temperature of 1085 ℃ for 7h, performing primary tempering and heat preservation at 930 ℃ for 4h, and performing secondary tempering and heat preservation at 550 ℃ for 3 h.
5) Processing the sintered blanks A1, A2 and B into cylinders with the size of D10mm multiplied by 10mm, and carrying out magnetic property detection; the steel plate was processed into 4 pieces each having dimensions of F30mm X20X 5mm, and the thermal demagnetization was examined. The results obtained are shown in table 1.
Table 1 magnetic properties and high temperature resistance test of sintered nd-fe-b magnet obtained in example 1
Example 2
1) According to mass percentage, for a main phase alloy A: (PrNd)31.0Dy2.0Ho1.2Al1.22Cu0.24Co1.2Ga0.20Nb0.1 5B0.93Fe61.86，B：(PrNd)31.0Dy2.5Ho1.5Al1.22Cu0.24Co1.2Ga0.20Nb0.15B0.93Fe60.76Respectively burdening, smelting the prepared raw materials, preparing alloy sheets with the thickness of 0.25-0.45 mm by a rapid hardening and strip throwing furnace, and preparing coarse particles after hydrogen breaking;
2) shearing metal dysprosium and metal holmium into small squares of 1-3cm, and breaking by hydrogen to obtain coarse particles DyH/Dy and HoH/Ho;
3) equally dividing coarse particles prepared from a main phase alloy A into two parts, namely A1 and A2, adding 0.5% of DyH/Dy powder and 0.3% of HoH/Ho powder into A2, then adding 1.5 per thousand of antioxidant into A1, A2 and B respectively, uniformly mixing, grinding by airflow to obtain alloy magnetic powder with the average particle size of about 2.85 mu m, adding 1.0 per thousand of lubricant, uniformly mixing, carrying out orientation molding under a magnetic field of 1.9T, and carrying out isostatic pressing under 19MPa to prepare a green body;
4) and (3) sintering the green body in a vacuum sintering furnace at 1078 ℃, preserving heat for 6.5h, then performing primary tempering and heat preservation for 4.5h at 940 ℃ and performing secondary tempering and heat preservation for 3.5h at 540 ℃.
5) Processing the sintered blanks A1, A2 and B into cylinders with the size of D10mm multiplied by 10mm, and carrying out magnetic property detection; and 4 square pieces of the steel plate are simultaneously processed into square pieces with the sizes of F30mm multiplied by 18mm multiplied by 4.5mm, and the hot demagnetization detection is carried out. The results obtained are shown in Table 2.
Table 2 magnetic properties and high temperature resistance test of the sintered nd-fe-b magnet obtained in example 2
Example 3
1) According to mass percentage, for a main phase alloy A: (PrNd)29.7Dy1.6Gd1.7Al1.25Cu0.27Co1.5Ga0.25Nb0.2 5B0.94Fe62.54，B：(PrNd)29.7Dy2.0Gd2.0Al1.25Cu0.27Co1.5Ga0.25Nb0.25B0.94Fe62.54Respectively burdening, smelting the prepared raw materials, preparing alloy sheets with the thickness of 0.25-0.45 mm by a rapid hardening and strip throwing furnace, and preparing coarse particles after hydrogen breaking;
2) shearing metal dysprosium and metal holmium into small squares of 1-3cm, and breaking by hydrogen to obtain coarse particles DyH/Dy and GdH/Gd;
3) equally dividing coarse particles prepared from a main phase alloy A into two parts, namely A1 and A2, adding 0.4% of DyH/Dy powder and 0.3% of GdH/Gd powder into A2, then adding 1.3% of antioxidant into A1, A2 and B respectively, uniformly mixing, grinding by airflow to obtain alloy magnetic powder with the average particle size of about 2.90 mu m, adding 1.2% of lubricant, uniformly mixing, carrying out orientation molding under a magnetic field of 1.9T, and preparing into a green body by isostatic pressing of 19 MPa;
4) and (3) sintering the green body in a vacuum sintering furnace at 1075 ℃, preserving heat for 7h, then performing primary tempering and heat preservation for 3.5h at 930 ℃, and performing secondary tempering and heat preservation for 4h at 525 ℃.
5) Processing the sintered blanks A1, A2 and B into cylinders with the size of D10mm multiplied by 10mm, and carrying out magnetic property detection; and 4 square pieces of the steel plate are processed into square pieces with the sizes of F30mm multiplied by 30mm multiplied by 5.5mm at the same time, and the hot demagnetization detection is carried out. The results obtained are shown in Table 3.
Table 3 magnetic properties and high temperature resistance test of the sintered nd-fe-b magnet obtained in example 3
Example 4
1) According to mass percentage, for a main phase alloy A: (PrNd)27.5Dy5.0Gd1.5Al0.65Cu0.24Co1.2Ga0.20Nb0. 3B0.92Fe62.49，B：(PrNd)27.5Dy5.5Gd1.8Al0.65Cu0.24Co1.2Ga0.20Nb0.3B0.92Fe62.49, respectively burdening, smelting the prepared raw materials, preparing alloy sheets with the thickness of 0.25-0.45 mm by a rapid hardening and strip throwing furnace, and preparing coarse particles after hydrogen breaking;
2) shearing metal dysprosium and metal holmium into small squares of 1-3cm, and breaking by hydrogen to obtain coarse particles DyH/Dy and GdH/Gd;
3) equally dividing coarse particles prepared from a main phase alloy A into two parts, namely A1 and A2, adding 0.5% of DyH/Dy powder and 0.3% of GdH/Gd powder into A2, then adding 1.5 per thousand of antioxidant into A1, A2 and B respectively, uniformly mixing, grinding by airflow to obtain alloy magnetic powder with the average particle size of about 2.90 mu m, adding 1.0 per thousand of lubricant, uniformly mixing, carrying out orientation molding under a magnetic field of 1.9T, and carrying out isostatic pressing under 19MPa to prepare a green body;
4) and (3) sintering the green body in a vacuum sintering furnace at the sintering temperature of 1080 ℃ for 7 hours, performing primary tempering and heat preservation at 940 ℃ for 4 hours, and performing secondary tempering and heat preservation at 535 ℃ for 5 hours.
5) Processing the sintered blanks A1, A2 and B into cylinders with the size of D10mm multiplied by 10mm, and carrying out magnetic property detection; and 4 square pieces of the steel plate are simultaneously processed into square pieces with the sizes of F45mm multiplied by 35mm multiplied by 7.5mm, and the hot demagnetization detection is carried out. The results obtained are shown in Table 4.
Table 4 magnetic properties and high temperature resistance test of the sintered nd-fe-b magnet obtained in example 4
According to the test results of the above embodiments, the preparation method of the high coercivity and high temperature resistant sintered neodymium iron boron magnet provided by the application can realize further magnetic hardening of the surface of the crystal grain, reconstruct a grain boundary organization structure, further improve the coercivity of the prepared magnet, and reduce the magnetic dilution of the magnet. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A preparation method of a high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet is characterized by comprising the following steps:
preparing coarse particles of main phase alloy of the sintered neodymium-iron-boron magnet;
preparing coarse grain of a grain boundary additive phase of the sintered neodymium-iron-boron magnet;
mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles;
grinding the uniformly mixed grain boundary additive phase coarse particles and the main phase alloy coarse particles into magnetic powder;
adding additives into the magnetic powder, mixing, and then carrying out orientation forming and static pressure to prepare a green body;
sintering and heat-preserving the green body to obtain a sintered neodymium-iron-boron magnet blank;
and carrying out heat treatment on the sintered neodymium iron boron magnet blank to obtain a high-coercivity and high-temperature-resistant sintered neodymium iron boron magnet.
2. The method for preparing the high-coercivity and high-temperature-resistant sintered NdFeB magnet according to claim 1, wherein the step of preparing the coarse particles of the main phase alloy of the sintered NdFeB magnet is as follows: according to a high magnetocrystalline anisotropy field HAThe main phase alloy components are proportioned, an alloy melt-spun sheet with the thickness of 0.25-0.45 mm is obtained by adopting a rapid-hardening sheet casting technology, and the main phase alloy coarse particles are prepared after hydrogen breaking.
3. The method for preparing the high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet according to claim 2, wherein the main phase alloy comprises the following components in percentage by weight:
[(PrNd)100-xRex]aFe100-a-b-cBbMcwherein Re is one or more of heavy rare earth elements Dy, Tb, Ho, Gd, Er, Yb, Tm and Lu, M is one or more of Al, Cu, Co, Zr, Nb, Ga, Mg, Si, Ti, Mo and Mn, x is more than or equal to 1 and less than or equal to 100, a is more than or equal to 29.1 and less than or equal to 40, b is more than or equal to 0.9 and less than or equal to 1.1, and z is more than or equal to 0.5 and less than or equal to 2.5.
4. The preparation method of the high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet according to claim 1, wherein the step of preparing the grain boundary additive phase coarse particles of the sintered neodymium-iron-boron magnet is specifically as follows: cutting Re or (Re) H into small squares with the diameter of about 1-3cm by a shearing machine, and preparing the grain boundary additive phase coarse particles after hydrogen breaking, wherein Re in the Re or (Re) H is one or more of heavy rare earth elements Dy, Tb, Ho, Gd, Er, Yb, Tm and Lu.
5. The method for preparing the high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet according to claim 1, wherein the step of mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles is specifically as follows: adding the grain boundary additive phase coarse particles into the main phase alloy coarse particles in proportion, and mixing the grain boundary additive phase coarse particles with the main phase alloy coarse particles, wherein the addition proportion of the grain boundary additive phase coarse particles is as follows: the addition amount of the grain boundary additive phase coarse particles accounts for 0.05-2% of the total mass of the main phase alloy coarse particles and the grain boundary additive phase coarse particles.
6. The method for preparing a high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet according to claim 1, wherein the step of mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles and then grinding the mixture into magnetic powder specifically comprises the following steps: and mixing the grain boundary additive phase coarse particles and the main phase alloy coarse particles, and then carrying out air flow grinding treatment to obtain the magnetic powder with the average grain size of 2.7-4.5 mu m.
7. The method for preparing a high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet according to claim 1, wherein the step of adding additives into the magnetic powder, mixing, performing orientation molding and static pressure to prepare a green body comprises the following specific steps: and adding an additive into the magnetic powder, mixing, carrying out orientation forming under a magnetic field of 1.6-2.0, and carrying out isostatic pressing under 19MPa to prepare the green body.
8. The method for preparing the high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet according to claim 1, wherein the step of sintering and heat-preserving the green body is specifically as follows: and sintering and heat-preserving the green body at the temperature of 1040-1100 ℃, wherein the heat-preserving time is 3-7 h.
9. The method for preparing a high-coercivity and high-temperature-resistant sintered neodymium-iron-boron magnet according to claim 1, wherein the heat treatment of the sintered neodymium-iron-boron magnet blank specifically comprises the following steps: performing primary heat treatment at 850-930 ℃ for 2-4 h, and performing secondary heat treatment at 450-550 ℃ for 3-6 h.
10. A high-coercivity, high-temperature-resistant sintered neodymium-iron-boron magnet, characterized in that it is prepared according to the preparation method of any one of claims 1 to 9.
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Cited By (3)
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|---|---|---|---|---|
| CN112802679A (en) * | 2020-12-31 | 2021-05-14 | 宁波松科磁材有限公司 | Preparation method of heavy rare earth-free sintered neodymium-iron-boron magnet |
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| CN113643870A (en) * | 2021-07-30 | 2021-11-12 | 宁波中杭磁材有限公司 | High-performance cerium-iron-boron magnet and preparation method thereof |
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