CN116110672A - Neodymium-iron-boron magnet material, preparation method thereof and electronic device containing neodymium-iron-boron magnet material - Google Patents

Neodymium-iron-boron magnet material, preparation method thereof and electronic device containing neodymium-iron-boron magnet material Download PDF

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CN116110672A
CN116110672A CN202310341644.6A CN202310341644A CN116110672A CN 116110672 A CN116110672 A CN 116110672A CN 202310341644 A CN202310341644 A CN 202310341644A CN 116110672 A CN116110672 A CN 116110672A
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magnet material
neodymium
iron
boron magnet
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黄佳莹
江政
蓝琴
付刚
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Fujian Changting Jinlong Rare Earth Co Ltd
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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
    • 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
    • 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

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Abstract

The invention discloses a neodymium-iron-boron magnet material, a preparation method thereof and an electronic device containing the neodymium-iron-boron magnet material. The neodymium-iron-boron magnet material comprises the following components: r:28.0 to 32.0 weight percent, wherein R comprises Nd, and also comprises Tb and/or Dy, and the Nd content is more than or equal to 27.0 weight percent; cu:0.16-0.40wt%; ga:0.07 to 0.24wt%; al: less than or equal to 0.10wt percent; b:0.96-1.10wt%; co:0.15-2.0wt%; m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb; the two grain boundaries of the NdFeB magnet material comprise a chemical composition of R w Fe 100‑w‑x‑y‑z Co x Cu y Ga z Is a phase of (2). The neodymium-iron-boron magnet material can realize remarkable improvement of coercive force under the condition of adding a small amount of heavy rare earth terbium element, and simultaneously maintain higher remanence and squareness.

Description

Neodymium-iron-boron magnet material, preparation method thereof and electronic device containing neodymium-iron-boron magnet material
Technical Field
The invention relates to a neodymium iron boron magnet material, a preparation method thereof and an electronic device containing the neodymium iron boron magnet material.
Background
The neodymium-iron-boron permanent magnet material is an important rare earth functional material, has excellent comprehensive magnetic properties, and is widely applied to various fields such as electric automobiles, air-conditioning compressors, elevators, wind power, electronic industries and the like. With the growth of new energy automobile markets and the demands of energy-efficient and energy-saving household appliances, miniaturization and energy-efficient indexes of motors become new concerns, and in order to reduce the size of the motors as much as possible and improve the output power of the motors, magnets are required to have high energy density, namely high remanence. Meanwhile, the application in the high-temperature fields also puts higher demands on the coercivity performance of the sintered Nd-Fe-B magnet.
The grain boundary diffusion process is an effective method for raising coercive force of magnet, and is characterized by that a layer of diffusion source material (including inorganic rare earth compound, rare earth metal or rare earth alloy) containing heavy rare earth element RH (Dy or Tb) is adhered on the surface of sintered NdFeB magnet, then high-temperature diffusion is implemented at the temp. above the smelting point of grain boundary neodymium-rich phase and below the sintering temp. of magnet so as to make RH permeate into interior along the grain boundary of magnet, and then the above-mentioned material is formed into the invented product 2 Fe 14 B the surface layer of the main phase crystal grain forms high anisotropic field (Nd, dy) 2 Fe 14 B or (Nd, tb) 2 Fe 14 And B, a magnetic hard layer, so that the coercive force of the magnet is improved.
Chinese patent document CN111223626A discloses a neodymium iron boron permanent magnet material, which comprises 28.7wt% of Nd, 0.05wt% of Dy, 0.1wt% of Pr, 1.0wt% of Tb, 0.05wt% of Ga, 0.05wt% of Cu, 0.1wt% of Al, 0.99wt% of B and 69.06wt% of Fe, wherein the remanence is 14.51kGs, and the coercivity is 25.23kOe, but the coercivity performance of the material cannot meet the motor demagnetization requirement in the specific field at present, the addition amount of heavy rare earth element Tb is relatively large, and the raw material cost is high.
Therefore, the R-T-B permanent magnet material with low heavy rare earth element content, high coercivity and high remanence is a technical problem to be solved in the field.
Disclosure of Invention
The invention provides a neodymium-iron-boron magnet material, a preparation method thereof and an electronic device containing the neodymium-iron-boron magnet material, and aims to overcome the defect that the remanence and the coercive force of a magnet obtained by a formula of the neodymium-iron-boron magnet material in the prior art cannot reach higher levels at the same time. According to the invention, the magnet material with higher remanence, coercive force and squareness can be prepared by regulating and controlling the types and the contents of elements in the neodymium-iron-boron magnet material.
The invention provides a raw material composition of a neodymium iron boron magnet material, which comprises the following components in percentage by weight:
r:28.0 to 32.0wt% of a rare earth element, wherein R comprises R1 and R2; the R1 is a rare earth element added during smelting, the R1 comprises Nd, the R1 also comprises at least one of Tb and Dy, and the Nd content is not less than 27.0wt%; r2 is a rare earth element added during grain boundary diffusion, wherein R2 comprises Tb and/or Dy, and the content of R2 is 0.1-0.8wt%;
Cu：0.16-0.40wt％；
Ga：0.07-0.24wt％；
Al：≤0.10wt％；
B：0.96-1.10wt％；
Co：0.15-2.0wt％；
m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb;
the balance being Fe and unavoidable impurities.
In the present invention, the content of R is preferably 29.5 to 31.5wt%, for example 30.24wt%, 30.28wt%, 30.35wt%, 30.36wt%, 30.43wt%, 30.44wt%, 30.45wt%, 30.46wt%, 30.48wt%, 30.55wt%, 30.66wt% or 30.95wt%, more preferably 30.0 to 31.0wt%; wt% refers to the mass percent in the feed composition.
In the present invention, the content of R1 is preferably 29.5 to 31.5wt%, for example 29.8wt%, 29.9wt%, 30.0wt%, 30.2wt% or 30.5wt%, more preferably 29.5 to 30.5wt%; wt% refers to the mass percent in the feed composition.
In the present invention, the content of Nd in R1 of the raw material composition is preferably 27.5 to 30.0wt%, for example 28.3wt%, 29.0wt%, 29.2wt% or 30.0wt%, more preferably 28.5 to 29.5wt%; wt% refers to the mass percent in the feed composition.
In the present invention, R1 may be selected from Nd and Dy, and may also be selected from Nd and Tb.
In the present invention, when Dy is contained in the R1, the Dy content is preferably 1.5wt% or less but not 0, for example, 0.5wt%, 1.0wt% or 1.5wt%, more preferably 0.5 to 1.0wt%; wt% refers to the mass percent in the feed composition.
In the present invention, when Tb is contained in the R1, the content of the Tb is preferably 1.5wt% or less but not 0, for example, 0.9wt% or 1.0wt%, more preferably 0.5 to 1.0wt%; wt% refers to the mass percent in the feed composition.
In the present invention, the content of R2 is preferably 0.2 to 0.7wt%, for example 0.24wt%, 0.36wt%, 0.43wt%, 0.44wt%, 0.45wt%, 0.46wt%, 0.48wt% or 0.55wt%, more preferably 0.25 to 0.60wt%; wt% refers to the mass percent in the feed composition.
In the present invention, R2 may be selected from Tb or Dy.
In the present invention, when Dy is contained in the R2, the Dy content is preferably 0.2 to 0.7wt%, for example 0.55wt%, more preferably 0.20 to 0.60wt%; wt% refers to the mass percent in the feed composition.
In the present invention, when Tb is contained in the R2, the content of the Tb is preferably 0.2 to 0.7wt%, for example 0.24wt%, 0.36wt%, 0.43wt%, 0.44wt%, 0.45wt%, 0.46wt% or 0.48wt%, more preferably 0.25 to 0.60wt%; wt% refers to the mass percent in the feed composition.
In some preferred embodiments of the invention, R1 is selected from Nd and Tb, and R2 is selected from Tb or Dy.
In some preferred embodiments of the invention, R1 is selected from Nd and Dy and R2 is selected from Tb.
In some preferred embodiments of the present invention, dy is less than or equal to 0.24wt% in the raw material composition of the NdFeB magnet material; wt% refers to the mass percentage in the raw material composition of the neodymium iron boron magnet material.
In the present invention, the Cu content is preferably 0.20 to 0.35wt%, for example 0.20wt%, 0.22wt%, 0.25wt%, 0.26wt%, 0.27wt%, 0.28wt%, 0.29wt%, 0.30wt%, 0.31wt% or 0.34wt%, more preferably 0.25 to 0.35wt%; wt% refers to the mass percent in the feed composition.
In the present invention, the mode of adding Cu preferably includes addition at the time of melting and/or addition at the time of grain boundary diffusion. When the Cu is added at the time of grain boundary diffusion, the content of Cu added at the time of grain boundary diffusion is preferably 0.03 to 0.10wt%, for example, 0.05wt%.
In the present invention, the content of Ga is preferably 0.10 to 0.22wt%, for example 0.11wt%, 0.18wt%, 0.19wt%, 0.20wt% or 0.21wt%, more preferably 0.15 to 0.20wt%; wt% refers to the mass percent in the feed composition.
In the present invention, the content of Al is preferably 0.08wt% or less, but not 0, more preferably 0.03 to 0.07wt%, for example, 0.03wt%, 0.04wt%, 0.05wt% or 0.06wt%; wt% refers to the mass percent in the feed composition.
In the present invention, the content of B is preferably 0.97 to 1.05wt%, for example 0.99wt%, 1.00wt% or 1.01wt%, more preferably 0.98 to 1.02wt%; wt% refers to the mass percent in the feed composition.
In the present invention, the Co content is preferably 0.30 to 2.0wt%, for example 0.38wt%, 0.55wt%, 0.58wt%, 0.60wt%, 0.61wt%, 0.62wt%, 0.64wt%, 0.85wt%, 1.00wt%, 1.50wt%, 2.00wt%; wt% refers to the mass percent in the feed composition.
In the present invention, the M may be selected from Ti.
In the present invention, the M may be present in an amount of 0.15 to 0.25wt%, for example 0.18wt%, 0.19wt%, 0.20wt% or 0.21wt%.
In some preferred embodiments of the present invention, the raw material composition of the neodymium-iron-boron magnet material comprises the following components in percentage by weight:
r:29.5 to 31.5wt% of a rare earth element, wherein R comprises R1 and R2; r1 is a rare earth element added during smelting, wherein R1 is selected from Nd and Tb, and the Nd content is not less than 27.0wt%; r2 is a rare earth element added during grain boundary diffusion, wherein R2 is selected from Tb or Dy, and the content of R2 is 0.2-0.7wt%;
Cu：0.20-0.35wt％；
Ga：0.07-0.22wt％；
Al：≤0.10wt％；
B：0.96-1.10wt％；
Co：0.15-2.0wt％；
m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb;
the balance being Fe and unavoidable impurities.
In some preferred embodiments of the present invention, the raw material composition of the neodymium-iron-boron magnet material comprises the following components in percentage by weight:
r:29.5 to 31.5wt% of a rare earth element, wherein R comprises R1 and R2; r1 is a rare earth element added during smelting, wherein R1 is selected from Nd and Dy, and the Nd content is not less than 27.0wt%; r2 is a rare earth element added during grain boundary diffusion, wherein R2 is selected from Tb, and the content of R2 is 0.2-0.7wt%;
Cu：0.20-0.35wt％；
Ga：0.07-0.22wt％；
Al：≤0.10wt％；
B：0.96-1.10wt％；
Co：0.15-2.0wt％；
m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb;
the balance being Fe and unavoidable impurities.
In some preferred embodiments of the present invention, the raw material composition of the neodymium iron boron magnet material comprises the components shown in any one of the following formulas 1 to 15 in percentage by weight:
Figure BDA0004158429760000051
Figure BDA0004158429760000061
the invention also provides a preparation method of the neodymium iron boron magnet material, which is carried out by adopting the raw material composition, and the preparation method is a diffusion preparation method conventional in the field, wherein the R1 element is added in a smelting step, and the R2 element is added in a grain boundary diffusion step.
In the present invention, the preparation method preferably comprises the steps of: and smelting, pulverizing, forming and sintering the elements except R2 in the raw material composition of the neodymium iron boron magnet material to obtain a sintered body, and then diffusing the mixture of the sintered body and the R2 through a grain boundary.
Wherein, the smelting operation and conditions can be a smelting process which is conventional in the art, and elements except R2 in the raw material composition of the NdFeB magnet material are generally smelted and cast by adopting an ingot casting process and a rapid hardening sheet process to obtain alloy sheets.
The smelting temperature may be 1400-1600 ℃, preferably 1450-1550 ℃, such as 1520 ℃.
The smelting environment may be a vacuum of 0.05 Pa.
The smelting equipment is generally an intermediate frequency vacuum smelting furnace, such as an intermediate frequency vacuum induction rapid hardening melt-spinning furnace. The milling operation and conditions may be conventional milling processes in the art, typically including hydrogen milling and/or air milling.
The hydrogen break-up process typically includes hydrogen absorption, dehydrogenation and cooling treatments. The temperature of the hydrogen absorption is generally 20-200 ℃. The dehydrogenation temperature is generally in the range from 400 to 650 ℃, preferably 500 to 600 ℃, for example 550 ℃. The pressure of the hydrogen absorption is generally 50 to 600kPa, preferably 60 to 300kPa, for example 90kPa.
The air-flow grinding powder is generally carried out under the condition of 0.1-2MPa, preferably 0.5-0.7 MPa. The gas flow in the gas flow milling powder can be nitrogen, for example. The air-jet milling process may be carried out for a period of time ranging from 2 to 4 hours, for example 3 hours.
Wherein the shaping operations and conditions may be conventional shaping processes in the art. Such as magnetic field shaping. The magnetic field strength of the magnetic field forming method is generally more than 1.5T.
Wherein the sintering operation and conditions may be conventional sintering processes in the art.
The sintering may be performed under a vacuum degree of less than 0.5 Pa.
The sintering temperature may be 1000-1200 ℃, preferably 1050-1100 ℃, e.g. 1080 ℃.
The sintering time may be 0.5 to 10 hours, preferably 3 to 6 hours, for example 6 hours.
In the present invention, it is known to those skilled in the art that the coating operation of R2 is generally also included before the grain boundary diffusion.
In the present invention, the operation and conditions of the grain boundary diffusion treatment may be a grain boundary diffusion process conventional in the art.
The temperature of the grain boundary diffusion may be 800-1000 ℃, for example 900 ℃.
The time for the grain boundary diffusion may be 5 to 20 hours, preferably 10 to 15 hours.
After the grain boundary diffusion, a low temperature tempering treatment is also performed as is conventional in the art. The low temperature tempering treatment is generally carried out at a temperature of 460-560 ℃. The low temperature tempering time may generally be 1 to 5 hours.
The invention also provides a neodymium-iron-boron magnet material prepared by the preparation method.
The invention also provides a neodymium-iron-boron magnet material, which comprises the following components in percentage by weight: r:28.0 to 32.0wt% of a rare earth element, wherein R comprises Nd, and at least one of Tb and Dy, wherein the Nd content is not less than 27.0wt%;
Cu：0.16-0.40wt％；
Ga：0.07-0.24wt％；
Al：≤0.10wt％；
B：0.96-1.10wt％；
Co：0.15-2.0wt％；
m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb;
the balance of Fe and unavoidable impurities;
the neodymium-iron-boron magnet material comprises Nd 2 Fe 14 B grains and their shell layer adjacent to said Nd 2 Fe 14 Two grain boundaries and a grain boundary triangular area of the B grains;
the neodymium-iron-boron magnet materialComprises a chemical composition of R in the grain boundary of two grains w Fe 100-w-x-y-z Co x Cu y Ga z Wherein w is 55.0-65.0%, x is 0.30-1.20%, y is 0.35-0.65%, z is 0.2-0.4%, and the percentages refer to atomic percentages in the object phase.
The inventor finds that the chemical composition is R in the research and development process w Fe 100-w-x-y-z Co x Cu y Ga z The generation of the phase of the grain boundary phase effectively reduces the area of a triangular area of the grain boundary, improves the continuity of the grain boundary, reduces the dissolution temperature of the grain boundary phase, and can remarkably improve the fluidity of the grain boundary phase and improve the distribution of the grain boundary phase, thereby greatly improving the coercive force of the neodymium iron boron material by enhancing the demagnetizing coupling capacity of the grain boundary phase.
In some preferred embodiments of the invention, the R comprises R1 and R2; the R1 comprises Nd, and the R1 also comprises at least one of Tb and Dy, wherein the Nd content is not less than 27.0wt%; the R2 comprises Tb and/or Dy, and the content of the R2 is 0.1-0.8wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
When R comprises R1 and R2, the heavy rare earth element in R1 is mainly distributed in Nd 2 Fe 14 And B crystal grains, wherein R2 is mainly distributed in the shell layer, the two-grain crystal boundary and the crystal boundary triangular area.
In the invention, the heavy rare earth element in R1 is mainly distributed in Nd 2 Fe 14 B grains "can be understood as the major distribution (typically 90wt% or more) of heavy rare earth elements in R1 in Nd caused by the conventional smelting sintering process in the art 2 Fe 14 And B grains, wherein a small amount of grains are distributed at grain boundaries. "R2 is predominantly distributed in the shell" is understood to mean that R2 is predominantly distributed in (typically 90wt% in Nd 2 Fe 14 B the shell and grain boundaries (two grain boundaries and grain boundary triangular regions) of the grains, a small portion also diffuses into Nd 2 Fe 14 In B grains, e.g. in Nd 2 Fe 14 The outer edge of the B crystal grain.
In the present invention, the content of R is preferably 29.5 to 31.5wt%, for example 30.24wt%, 30.28wt%, 30.35wt%, 30.36wt%, 30.43wt%, 30.44wt%, 30.45wt%, 30.46wt%, 30.48wt%, 30.55wt%, 30.66wt% or 30.95wt%, more preferably 30.0 to 31.0wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, the Nd content in the neodymium iron boron magnet material is preferably 27.5 to 30.0wt%, for example 28.3wt%, 29.0wt%, 29.2wt% or 30.0wt%, more preferably 28.5 to 29.5wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, when the R includes R1 and R2, the content of R1 in the NdFeB magnet material is preferably 29.5 to 31.5wt%, for example 29.8wt%, 29.9wt%, 30.0wt%, 30.2wt% or 30.5wt%, more preferably 29.5 to 30.5wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, R1 may be selected from Nd and Dy, and may also be selected from Nd and Tb.
In the present invention, when Dy is contained in the R1, the Dy content is preferably 1.5wt% or less but not 0, for example, 0.5wt%, 1.0wt% or 1.5wt%, more preferably 0.5 to 1.0wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, when Tb is contained in the R1, the content of the Tb is preferably 1.5wt% or less but not 0, for example, 0.9wt% or 1.0wt%, more preferably 0.5 to 1.0wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, when the R includes R1 and R2, the content of R2 in the NdFeB magnet material is preferably 0.2 to 0.7wt%, for example, 0.24wt%, 0.36wt%, 0.43wt%, 0.44wt%, 0.45wt%, 0.46wt%, 0.48wt% or 0.55wt%, more preferably 0.25 to 0.60wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, R2 may be selected from Tb or Dy.
In the present invention, when Dy is contained in the R2, the Dy content is preferably 0.2 to 0.7wt%, for example 0.55wt%, more preferably 0.20 to 0.60wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, when Tb is contained in the R2, the content of the Tb is preferably 0.2 to 0.7wt%, for example 0.24wt%, 0.36wt%, 0.43wt%, 0.44wt%, 0.45wt%, 0.46wt% or 0.48wt%, more preferably 0.25 to 0.60wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In some preferred embodiments of the invention, R1 is selected from Nd and Tb, and R2 is selected from Tb or Dy.
In some preferred embodiments of the invention, R1 is selected from Nd and Dy and R2 is selected from Tb.
In some preferred embodiments of the present invention, when Dy is included in the R, the Dy content is preferably 1.50wt% or less, for example, 0.50wt%, 0.55wt%, 1.00wt% or 1.50wt%, more preferably 0.50 to 1.50wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In some preferred embodiments of the present invention, when Tb is contained in the R, the content of Tb is preferably 1.50wt% or less, for example 0.24wt%, 0.36wt%, 0.43wt%, 0.44wt%, 0.45wt%, 0.46wt%, 0.48wt%, 1.00wt% or 1.35wt%, more preferably 0.20 to 1.50wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In some preferred embodiments of the present invention, dy is less than or equal to 0.24wt% in the neodymium iron boron magnet material; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In some preferred embodiments of the present invention, 0.ltoreq.RH/R < 0.1 is satisfied in the neodymium iron boron magnet material, wherein R is the total mass content of rare earth elements, RH is the total mass content of heavy rare earth elements in the neodymium iron boron magnet material, and RH comprises at least one of Tb and Dy.
Wherein 0.ltoreq.RH/R < 0.08, e.g.0.03, 0.04, 0.05 or 0.06, may be satisfied.
In the present invention, the grain boundary triangular region generally refers to a region where three or more grain boundary phases intersect, and is distributed with a boron-rich phase, a rare earth oxide, a rare earth carbide, and a void. The area ratio of the grain boundary triangular area is calculated by the ratio of the area of the grain boundary triangular area to the total area of crystal grains and grain boundaries.
In some preferred embodiments of the invention, the grain boundary delta area ratio is less than or equal to 3.00%, for example the grain boundary delta area ratio is less than or equal to 2.80%, and for example 2.23%, 2.25%, 2.33%, 2.37%, 2.38%, 2.39%, 2.41%, 2.42%, 2.45%, 2.54%, 2.56%, 2.61%, 2.63%, 2.64% or 2.71%.
In the invention, the chemical composition of the grain boundary of the two grains of the NdFeB magnet material is as follows: r is R w Fe 100-w-x-y- z Co x Cu y Ga z And generally includes two kinds of hetero-phases, namely rare earth oxide and rare earth carbide.
In some preferred embodiments of the invention, the chemical composition is R w Fe 100-w-x-y-z Co x Cu y Ga z W is 55.0-63.0%, e.g. 55.25%, 55.95%, 56.42%, 56.62%, 56.97%, 57.34%, 57.73%, 58.21%, 58.31%, 58.51%, 58.57%, 58.67%, 58.68%, 58.71%, 62.83%, percent referring to atomic percent in the object phase.
In some preferred embodiments of the invention, the chemical composition is R w Fe 100-w-x-y-z Co x Cu y Ga z X is 0.30-1.10%, e.g. 0.35%, 0.36%, 0.39%, 0.42%, 0.44%, 0.46%, 0.48%, 0.49%, 0.54%, 0.59%, 0.61%, 0.62%, 0.81%, 1.08%, by atomic percentage in the object phase.
In some preferred embodiments of the invention, the chemical composition is R w Fe 100-w-x-y-z Co x Cu y Ga z In the phase (a), y is 0.35-0.61%, for example 0.37%, 0.41%, 0.42%, 0.44%, 0.45%, 0.46%, 0.47%, 0.51%, 0.55% or 0.61%, the percentages referring to the atomic percentages in the said phase.
In some preferred embodiments of the invention, the chemical composition is R w Fe 100-w-x-y-z Co x Cu y Ga z In the phase (a), z is 0.2-0.36%, for example 0.26%, 0.30%, 0.31%, 0.32%, 0.33%, 0.34%, 0.35% or 0.36%, by percentage is meant the atomic percentage in the said object phase.
In some preferred embodiments of the invention, the chemical composition is R w Fe 100-w-x-y-z Co x Cu y Ga z Specifically R is 55.25 Fe 43.5 Co 0.44 Cu 0.46 Ga 0.35 、R 58.71 Fe 40.08 Co 0.42 Cu 0.47 Ga 0.32 、R 62.83 Fe 35.82 Co 0.49 Cu 0.55 Ga 0.31 、R 56.62 Fe 42.2 Co 0.39 Cu 0.45 Ga 0.34 、R 56.42 Fe 42.55 Co 0.36 Cu 0.37 Ga 0.30 、R 57.34 Fe 41.29 Co 0.46 Cu 0.61 Ga 0.36 、R 55.95 Fe 42.85 Co 0.46 Cu 0.42 Ga 0.32 、R 57.73 Fe 40.98 Co 0.54 Cu 0.42 Ga 0.33 、R 58.21 Fe 40.69 Co 0.35 Cu 0.44 Ga 0.31 、R 56.97 Fe 41.78 Co 0.48 Cu 0.51 Ga 0.26 、R 58.51 Fe 40.14 Co 0.59 Cu 0.45 Ga 0.31 、R 58.67 Fe 40.00 Co 0.62 Cu 0.41 Ga 0.30 、R 58.31 Fe 40.30 Co 0.61 Cu 0.45 Ga 0.33 、R 58.57 Fe 39.84 Co 0.81 Cu 0.46 Ga 0.32 Or R is 58.68 Fe 39.46 Co 1.08 Cu 0.44 Ga 0.34 。
In the present invention, the chemical composition is R w Fe 100-w-x-y-z Co x Cu y Ga z Is in the phase ofThe area in the two-grain boundaries is preferably 0.2 to 0.9%, for example 0.36%, 0.41%, 0.45%, 0.52%, 0.59%, 0.62%, 0.67%, 0.69%, 0.71%, 0.74%, 0.76%, 0.78% or 0.82%, more preferably 0.3 to 0.9%, relative to the total area of the two-grain boundaries.
In the present invention, the Cu content is preferably 0.20 to 0.35wt%, for example 0.20wt%, 0.22wt%, 0.25wt%, 0.26wt%, 0.27wt%, 0.28wt%, 0.29wt%, 0.30wt%, 0.31wt% or 0.34wt%, more preferably 0.25 to 0.35wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, the content of Ga is preferably 0.10 to 0.22wt%, for example 0.11wt%, 0.18wt%, 0.19wt%, 0.20wt% or 0.21wt%, more preferably 0.15 to 0.20wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, the content of Al is preferably 0.08wt% or less, more preferably 0.03 to 0.07wt%, for example, 0.03wt%, 0.04wt%, 0.05wt% or 0.06wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, the content of B is preferably 0.97 to 1.05wt%, for example 0.99wt%, 1.00wt% or 1.01wt%, more preferably 0.98 to 1.02wt%; wt% refers to the mass percentage in the neodymium iron boron magnet material.
In the present invention, the Co content is preferably 0.30 to 2.0wt%, for example 0.38wt%, 0.55wt%, 0.58wt%, 0.60wt%, 0.61wt%, 0.62wt%, 0.64wt%, 0.85wt%, 1.00wt%, 1.50wt%, 2.00wt%; wt% refers to the mass percent in the neodymium iron boron magnet material.
In the present invention, the M may be selected from Ti.
In the present invention, the M may be present in an amount of 0.15 to 0.25wt%, for example 0.18wt%, 0.19wt%, 0.20wt% or 0.21wt%.
In some preferred embodiments of the present invention, the neodymium-iron-boron magnet material comprises the following components in percentage by weight:
r:29.5-31.5wt%, wherein R is rare earth element, and comprises Nd and Tb, and optionally Dy; wherein Nd content is not less than 27.0wt%;
Cu：0.20-0.35wt％；
Ga：0.07-0.22wt％；
Al：≤0.10wt％；
B：0.96-1.10wt％；
Co：0.15-2.0wt％；
m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb;
the balance of Fe and unavoidable impurities;
the neodymium-iron-boron magnet material comprises Nd 2 Fe 14 B grains and their shell layer adjacent to said Nd 2 Fe 14 The area of the grain boundary triangular area is less than or equal to 3.00%;
the two grain boundaries of the NdFeB magnet material comprise a chemical composition of R w Fe 100-w-x-y-z Co x Cu y Ga z Wherein w is 55.0-65.0%, x is 0.30-1.20%, y is 0.35-0.65%, z is 0.2-0.4%, and the percentages refer to atomic percentages in the object phase.
In some preferred embodiments of the present invention, the raw material composition of the neodymium-iron-boron magnet material comprises the following components in percentage by weight:
r:29.5 to 31.5wt% of a rare earth element, wherein R is a rare earth element and comprises Nd, dy and Tb, and the Nd content is not less than 27.0wt%;
Cu：0.20-0.35wt％；
Ga：0.07-0.22wt％；
Al：≤0.10wt％；
B：0.96-1.10wt％；
Co：0.15-2.0wt％；
m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb;
the balance of Fe and unavoidable impurities;
the neodymium-iron-boron magnet material comprises Nd 2 Fe 14 B grains and their shell layer adjacent to said Nd 2 Fe 14 The area of the grain boundary triangular area is less than or equal to 3.00%;
the two grain boundaries of the NdFeB magnet material comprise a chemical composition of R w Fe 100-w-x-y-z Co x Cu y Ga z Wherein w is 55.0-65.0%, x is 0.30-1.20%, y is 0.35-0.65%, z is 0.2-0.4%, and the percentages refer to atomic percentages in the object phase.
In some preferred embodiments of the present invention, the formulation of the neodymium iron boron magnet material is any one of the formulations shown in the following table formulations 16-30, in weight percent:
Figure BDA0004158429760000131
Figure BDA0004158429760000141
the invention also provides an application of the neodymium-iron-boron magnet material in preparing magnetic steel.
Wherein, the magnetic steel is preferably 52UH and 54UH magnetic steel.
The invention also provides an electronic device which comprises the neodymium-iron-boron magnet material.
On the basis of conforming to the common knowledge in the field, the above preferred conditions can be arbitrarily combined to obtain the preferred examples of the invention.
The reagents and materials used in the present invention are commercially available.
The invention has the positive progress effects that: according to the neodymium iron boron magnet material, the types and the contents of various elements are matched, on the premise of not containing a large amount of heavy rare earth elements, the area of a grain boundary triangular region can be reduced on the basis of the existing neodymium iron boron magnet material, and higher compactness is obtained, so that the residual magnetism Br of the magnet is improved, meanwhile, a new phase is generated in a two-particle grain boundary, the fluidity of the grain boundary phase is improved, the two-particle grain heavy rare earth elements are correspondingly and uniformly distributed on the grain boundary and a main phase shell layer, and the coercive force Hcj of the magnet is improved.
Drawings
Fig. 1 is an EPMA microstructure of the neodymium-iron-boron magnet material of example 1. The point indicated by arrow 1 in the figure is R contained in the grain boundary of the two grains w Fe 100-w-x-y-z Co x Cu y Ga z The new phase, the position indicated by arrow 2 is the grain boundary triangle, and the position indicated by arrow 3 is Nd 2 Fe 14 And B main phase.
Detailed Description
The invention is further illustrated by means of the following examples, which are not intended to limit the scope of the invention. The experimental methods, in which specific conditions are not noted in the following examples, were selected according to conventional methods and conditions, or according to the commercial specifications.
1. The components and contents (wt%) of the neodymium iron boron magnet materials of examples 1 to 15 and comparative examples 1 to 10 of the present invention are shown in the following table 1.
TABLE 1
Figure BDA0004158429760000151
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Figure BDA0004158429760000161
Note that: "/" means that the element is not contained. The weight percent is mass percent.
2. Preparation method of NdFeB magnet material in example 1
(1) Smelting and casting processes: according to the formulation shown in Table 1, the prepared raw materials except R2 were placed in a crucible of alumina, vacuum-melted in a high-frequency vacuum melting furnace under vacuum of 0.05Pa and at 1520℃and cast by introducing argon gas into a medium-frequency vacuum induction rapid-hardening melt-spinning furnace, and then alloy was quenched to obtain alloy flakes.
(2) And (3) a hydrogen crushing and pulverizing process: and vacuumizing a hydrogen breaking furnace for placing the quenched alloy at room temperature, then introducing hydrogen with the purity of 99.9% into the hydrogen breaking furnace, maintaining the pressure of the hydrogen at 90kPa, fully absorbing hydrogen, heating while vacuumizing, fully dehydrogenating, cooling, and taking out the crushed powder of the hydrogen breaking furnace. Wherein the temperature of hydrogen absorption is room temperature, and the temperature of dehydrogenation is 550 ℃.
(3) And (3) carrying out airflow grinding and pulverizing: and (3) carrying out jet milling on the hydrogen-broken and crushed powder for 3 hours under the condition that the pressure of a crushing chamber is 0.6MPa in a nitrogen atmosphere to obtain fine powder.
(4) The forming process comprises the following steps: shaping the powder after passing through the air flow film in a magnetic field strength of 1.5T or more.
(5) And (3) sintering: and (3) conveying each molded body into a sintering furnace for sintering, and sintering at 1080 ℃ for 6 hours under vacuum of less than 0.5Pa to obtain a sintered body.
(6) Grain boundary diffusion process: after cleaning the surface of the sintered body, R2 (such as Tb or alloy, oxide or fluoride of Dy, tb alloy in example 1) is coated on the surface of the sintered body, and diffused at 900 ℃ for 10-15 hours, then cooled to room temperature, and then tempered at 460-560 ℃ for 1-5 hours.
3. Component measurement: the neodymium iron boron magnet materials in examples 1 to 15 and comparative examples 1 to 10 were measured using a high frequency inductively coupled plasma emission spectrometer (ICP-OES). The test results are shown in table 2 below.
TABLE 2
Numbering device Nd Dy Tb Co Cu Ga Ti B Al Fe
Example 1 28.30 1.50 0.48 0.64 0.31 0.20 0.21 0.99 0.06 67.31
Example 2 29.20 1.00 0.46 0.62 0.29 0.19 0.18 1.00 0.04 67.02
Example 3 30.00 0.50 0.45 0.60 0.30 0.18 0.19 0.99 0.05 66.74
Example 4 29.00 1.00 0.36 0.58 0.28 0.18 0.18 0.99 0.04 67.39
Example 5 29.00 1.00 0.24 0.55 0.25 0.20 0.19 1.01 0.03 67.53
Example 6 29.00 1.00 0.44 0.61 0.34 0.21 0.20 0.99 0.05 67.16
Example 7 29.00 1.00 0.43 0.58 0.22 0.18 0.21 0.99 0.06 67.33
Example 8 29.00 1.00 0.48 0.85 0.31 0.18 0.18 0.99 0.04 66.97
Example 9 29.00 1.00 0.46 0.38 0.29 0.19 0.20 1.00 0.05 67.43
Example 10 29.00 1.00 0.45 0.62 0.29 0.11 0.19 0.99 0.05 67.30
Example 11 29.00 0.00 1.35 1.00 0.27 0.19 0.18 1.00 0.05 66.96
Example 12 29.00 0.55 1.00 1.00 0.20 0.19 0.18 0.99 0.04 66.85
Example 13 29.00 1.00 0.44 1.00 0.26 0.18 0.19 0.99 0.05 66.89
Example 14 29.00 1.00 0.45 1.50 0.28 0.18 0.18 0.99 0.06 66.36
Example 15 29.00 1.00 0.45 2.00 0.27 0.19 0.19 1.00 0.05 65.85
Comparative example 1 29.00 1.00 0.44 / 0.28 0.19 0.21 0.99 0.05 67.84
Comparative example 2 29.00 1.00 0.43 / 0.27 0.20 0.19 0.99 0.30 67.62
Comparative example 3 29.00 1.00 0.47 0.61 0.29 / 0.20 0.99 0.05 67.39
Comparative example 4 29.00 1.00 0.45 0.61 0.09 0.19 0.21 0.99 0.05 67.41
Comparative example 5 29.00 1.00 0.45 0.65 0.28 0.19 0.20 0.99 0.30 66.94
Comparative example 6 29.00 1.00 0.43 0.63 0.45 0.20 0.18 1.00 0.05 67.06
Comparative example 7 29.00 1.00 0.43 0.64 0.27 0.30 0.20 0.99 0.06 67.11
Comparative example 8 29.00 1.00 0.44 0.68 0.27 0.19 0.40 0.99 0.06 66.97
Comparative example 9 29.00 1.50 0.05 0.65 0.26 0.19 0.20 0.99 0.05 67.11
Comparative example 10 29.00 1.00 0.90 0.59 0.28 0.20 0.20 0.99 0.06 66.78
Effect example 1
The neodymium-iron-boron magnet materials in examples 1 to 15 and comparative examples 1 to 10 were examined as follows:
1. magnetic performance test: the sintered magnet was subjected to magnetic property detection using a PFM-14 magnetic property measuring instrument from Hirs, UK at a temperature of 20℃to obtain data of remanence (Br), intrinsic coercivity (Hcj) and squareness (Hk/Hcj), and the test results are shown in Table 3 below.
2. FE-EPMA detection: the vertical alignment surface of the neodymium iron boron magnet material was polished and examined by a field emission electron probe microanalyzer (FE-EPMA) (JEOL, 8530F). The area ratio of the grain boundary triangle and the new phase, which was measured by elemental analysis of EPMA, were tested. The area ratio (%) of the grain boundary triangular region means: the ratio of the area of the grain boundary triangular region to the total area of "crystal grains and grain boundaries", wherein the grain boundaries include the grain boundary triangular region and the two grain boundaries. The area ratio (%) of the new phase in the grain boundary of the two grains is: the area of the new phase in the grain boundaries of the two grains accounts for the ratio of the total area of the grain boundaries of the two grains.
TABLE 3 Table 3
Figure BDA0004158429760000181
Figure BDA0004158429760000191
Note that: "X" means that the grain boundary phase of the two grains does not contain a chemical composition of R w Fe 100-w-x-y-z Co x Cu y Ga z W, x, y, z refers to the percentage of atoms in the new phase of R (rare earth element), co, cu, ga, respectively.
As is clear from the data in Table 3, the present invention can produce a new phase R in the grain boundary of two grains by controlling the contents of Co, ga, cu, rare earth elements, etc w Fe 100-w-x-y-z Co x Cu y Ga z The new phase improves the fluidity of a grain boundary phase, and the coercivity of the prepared neodymium-iron-boron magnet material is obviously improved compared with the coercivity of the prior art, and the remanence and squareness are kept at higher levels.
In the NdFeB magnet materials of examples 1 to 15, the heavy rare earth element in R1 added in the formulation is mainly distributed in Nd 2 Fe 14 And B crystal grains, wherein R2 is mainly distributed in the shell layer, the two-grain crystal boundary and the crystal boundary triangular area.
Effect example 2
As shown in FIG. 1, the EPMA microstructure of the NdFeB magnet material prepared in example 1 is shown. The point indicated by arrow 1 in the figure is R contained in the grain boundary (light gray region) of the two grains w Fe 100-w-x-y-z Co x Cu y Ga z The new phase, arrow 2, is shown as the grain boundary triangle (silvery area) and arrow 3 is shown as Nd 2 Fe 14 Major phase B (dark grey area). It can be further seen from the data of Table 3 that the area of the grain boundary triangle is smaller than that of the conventional magnet material (the face of the grain boundary triangle of the conventional magnet materialThe product is typically between 3-4%).

Claims (10)

1. The neodymium iron boron magnet material is characterized by comprising the following components in percentage by weight: r:28.0 to 32.0wt% of a rare earth element, wherein R comprises Nd, and at least one of Tb and Dy, wherein the Nd content is not less than 27.0wt%;
Cu：0.16-0.40wt％；
Ga：0.07-0.24wt％；
Al：≤0.10wt％；
B：0.96-1.10wt％；
Co：0.15-2.0wt％；
m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb;
the balance of Fe and unavoidable impurities;
the neodymium-iron-boron magnet material comprises Nd 2 Fe 14 B grains and their shell layer adjacent to said Nd 2 Fe 14 Two grain boundaries and a grain boundary triangular area of the B grains;
the two grain boundaries of the NdFeB magnet material comprise a chemical composition of R w Fe 100-w-x-y-z Co x Cu y Ga z Wherein w is 55.0-65.0%, x is 0.30-1.20%, y is 0.35-0.65%, z is 0.2-0.4%, and the percentages refer to atomic percentages in the object phase.
2. A neodymium-iron-boron magnet material according to claim 1, wherein said neodymium-iron-boron magnet material satisfies one or more of the following conditions:
(a) The grain boundary triangle area ratio is less than or equal to 3.00 percent, such as less than or equal to 2.80 percent;
(b) W is 55.0-63.0%, and the percentage refers to the atomic percentage in the phase;
(c) X is 0.30-1.10%, and the percentage refers to the atomic percentage in the phase;
(d) The y is 0.35-0.61%, and the percentage refers to the atomic percentage in the phase;
(e) The z is 0.2-0.36%, and the percentage refers to the atomic percentage in the phase; and
(f) The chemical composition is R w Fe 100-w-x-y-z Co x Cu y Ga z The ratio of the area of the phase in the two grain boundaries to the total area of the two grain boundaries is 0.2 to 0.9%.
3. A neodymium-iron-boron magnet material according to claim 1, wherein said neodymium-iron-boron magnet material satisfies one or more of the following conditions:
(g) The R comprises R1 and R2; the R1 comprises Nd, and the R1 also comprises at least one of Tb and Dy, wherein the Nd content is not less than 27.0wt%; the R2 comprises Tb and/or Dy, and the content of the R2 is 0.1-0.8wt%;
the heavy rare earth element in R1 is mainly distributed in Nd 2 Fe 14 B crystal grains, wherein R2 is mainly distributed in the shell layer, the two-grain crystal boundary and the crystal boundary triangular area;
(h) In the neodymium-iron-boron magnet material, dy is less than or equal to 0.24wt%, and the wt% refers to the mass percentage in the neodymium-iron-boron magnet material; and
(i) In the neodymium-iron-boron magnet material, RH is more than or equal to 0 and less than or equal to 0.1, wherein R is the total mass content of rare earth elements, RH is the total mass content of heavy rare earth elements in the neodymium-iron-boron magnet material, and RH comprises at least one of Tb and Dy.
4. A neodymium-iron-boron magnet material according to claim 3, wherein said neodymium-iron-boron magnet material satisfies one or more of the following conditions:
(j) The content of R is 29.5-31.5wt%; wt% refers to the mass percentage in the neodymium-iron-boron magnet material;
(k) In the neodymium iron boron magnet material, the content of Nd is 27.5-30.0wt%; wt% refers to the mass percentage in the neodymium-iron-boron magnet material;
(l) When the R comprises R1 and R2, the content of R1 in the neodymium-iron-boron magnet material is 29.5-31.5wt%, and the wt% refers to the mass percentage in the neodymium-iron-boron magnet material; and
(m) when the R includes R1 and R2, the content of R2 in the NdFeB magnet material is 0.2-0.7wt%, and wt% refers to the mass percentage in the NdFeB magnet material.
5. A neodymium-iron-boron magnet material according to any one of claims 1-4, wherein said neodymium-iron-boron magnet material satisfies one or more of the following conditions:
(n) the content of Cu is 0.20-0.35wt%, and the wt% refers to the mass percentage in the NdFeB magnet material;
(o) the content of Al is 0.08wt% or less, and wt% refers to the mass percentage in the neodymium-iron-boron magnet material;
(p) the content of B is 0.97-1.05wt%, and the wt% refers to the mass percentage in the NdFeB magnet material; and
(q) the Co content is 0.30-2.0wt%, and wt% refers to the mass percentage in the NdFeB magnet material.
6. The preparation method of the neodymium-iron-boron magnet material is characterized in that the preparation method is prepared by adopting a raw material composition of the neodymium-iron-boron magnet material through diffusion; wherein:
(1) The raw material composition of the neodymium-iron-boron magnet material comprises the following components in percentage by weight:
r:28.0 to 32.0wt% of a rare earth element, wherein R comprises R1 and R2; the R1 is a rare earth element added during smelting, the R1 comprises Nd, the R1 also comprises at least one of Tb and Dy, and the Nd content is not less than 27.0wt%; r2 is a rare earth element added during grain boundary diffusion, wherein R2 comprises Tb and/or Dy, and the content of R2 is 0.1-0.8wt%;
Cu：0.16-0.40wt％；
Ga：0.07-0.24wt％；
Al：≤0.10wt％；
B：0.96-1.10wt％；
Co：0.15-2.0wt％；
m:0.10-0.25wt%, M is selected from at least one of Ti, zr and Nb;
the balance of Fe and unavoidable impurities;
(2) The elements in R1 are added in a smelting step, and the elements in R2 are added in a grain boundary diffusion step.
7. The method of claim 6, wherein the method of preparing a neodymium-iron-boron magnet material satisfies one or more of the following conditions:
(R) the content of R is 29.5-31.5wt%, and the wt% refers to the mass percentage in the raw material composition of the NdFeB magnet material;
(s) in the raw material composition of the neodymium iron boron magnet material, the content of Nd is 27.5-30.0wt%, and the wt% refers to the mass percentage in the raw material composition of the neodymium iron boron magnet material;
(t) Dy is less than or equal to 0.24wt% in the raw material composition of the neodymium-iron-boron magnet material, wherein the wt% is the mass percentage in the raw material composition of the neodymium-iron-boron magnet material;
(u) the content of R1 in the raw material composition of the neodymium iron boron magnet material is 29.5-31.5wt%, and the wt% refers to the mass percentage in the raw material composition of the neodymium iron boron magnet material;
(v) The content of R2 in the raw material composition of the neodymium-iron-boron magnet material is 0.2-0.7wt%, and the wt% refers to the mass percentage in the raw material composition of the neodymium-iron-boron magnet material;
(w) when Dy is contained in the R1, the Dy content is 1.5wt% or less, but not 0wt% means mass% in the raw material composition of the neodymium-iron-boron magnet material;
(x) When Tb is contained in the R1, the content of the Tb is 1.5wt% or less, but not 0wt%, which means the mass percentage in the raw material composition of the neodymium iron boron magnet material;
(y) when Dy is contained in the R2, the Dy content is 0.2 to 0.7wt%, wt% referring to mass% in the raw material composition of the neodymium iron boron magnet material;
(z) when Tb is contained in the R2, the content of Tb is 0.2 to 0.7wt%, and wt% means mass% in the raw material composition of the neodymium iron boron magnet material;
(aa) said R1 is selected from Nd and Tb, and said R2 is selected from Tb or Dy; alternatively, R1 is selected from Nd and Dy, and R2 is selected from Tb;
(ab) the content of Cu is 0.20-0.35wt%, and the wt% refers to the mass percentage in the raw material composition of the neodymium-iron-boron magnet material;
(ac) the Al content is 0.08wt% or less, wt% referring to mass percentage in the raw material composition of the neodymium-iron-boron magnet material;
(ad) the content of B is 0.97-1.05wt%, and the wt% refers to the mass percentage in the raw material composition of the NdFeB magnet material; and
(ae) the content of Co is 0.30-2.0wt%, and wt% refers to the mass percentage in the raw material composition of the neodymium iron boron magnet material.
8. A method of preparing a neodymium-iron-boron magnet material according to claim 6 or 7, comprising the steps of: smelting, pulverizing, forming and sintering elements except R2 in the raw material composition of the neodymium iron boron magnet material to obtain a sintered body, and then diffusing a mixture of the sintered body and the R2 through a grain boundary to obtain the neodymium iron boron magnet material;
the smelting temperature can be 1400-1600 ℃;
the sintering temperature can be 1000-1200 ℃;
the sintering time may be 0.5 to 10 hours.
9. A neodymium iron boron magnet material, characterized in that it is produced by the preparation method according to any one of claims 6-8.
10. An electronic device comprising a neodymium-iron-boron magnet material according to any one of claims 1-5, 9.
CN202310341644.6A 2023-03-31 2023-03-31 Neodymium-iron-boron magnet material, preparation method thereof and electronic device containing neodymium-iron-boron magnet material Pending CN116110672A (en)

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