WO2021169886A1 - Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation - Google Patents

Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation Download PDF

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WO2021169886A1
WO2021169886A1 PCT/CN2021/077171 CN2021077171W WO2021169886A1 WO 2021169886 A1 WO2021169886 A1 WO 2021169886A1 CN 2021077171 W CN2021077171 W CN 2021077171W WO 2021169886 A1 WO2021169886 A1 WO 2021169886A1
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percentage
grain boundary
mass
content
neodymium iron
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PCT/CN2021/077171
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Chinese (zh)
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骆溁
黄佳莹
廖宗博
蓝琴
林玉麟
师大伟
谢菊华
龙严清
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厦门钨业股份有限公司
福建省长汀金龙稀土有限公司
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Priority to JP2022547172A priority Critical patent/JP7470804B2/ja
Publication of WO2021169886A1 publication Critical patent/WO2021169886A1/fr

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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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/70—Wind energy
    • Y02E10/72—Wind turbines with rotation axis in wind direction

Definitions

  • the invention specifically relates to a neodymium iron boron magnet material, a raw material composition, and a preparation method and application.
  • Nd-Fe-B permanent magnetic material is based on Nd 2 Fe l4 B compound, which has the advantages of high magnetic properties, low thermal expansion coefficient, easy processing and low price. Since its introduction, it has grown at an average annual rate of 20-30%. Become the most widely used permanent magnet material. According to the preparation method, Nd-Fe-B permanent magnets can be divided into three types: sintering, bonding and hot pressing. Among them, sintered magnets account for more than 80% of the total output and are the most widely used.
  • Chinese patent document CN110571007A discloses a rare earth permanent magnet material, which adds more than 1.5% of heavy rare earth elements and more than 0.8% of cobalt at the same time, and finally obtains Nd-Fe-B with better coercivity and magnetic properties. magnet.
  • NdFeB magnet materials with better magnetic properties need to add a large amount of heavy rare earth elements and cobalt elements, which is costly.
  • technical solutions that can still reach a considerable level or even better have yet to be developed.
  • the invention aims to overcome the need to add a large amount of cobalt element or heavy rare earth element to the NdFeB magnet material in the prior art to improve the magnetic properties (remanence, coercivity and thermal stability) of the NdFeB magnet material, but Due to the high cost defect, a neodymium iron boron magnet material, raw material composition, preparation method and application are provided.
  • the neodymium iron boron magnet material of the present invention has higher remanence, coercivity, and good thermal stability.
  • the present invention adopts the following technical solutions to solve the above technical problems.
  • the present invention provides a raw material composition of neodymium iron boron magnet material, which includes the following components by mass content: R: 28-33%;
  • the R is a rare earth element, R includes R1 and R2, the R1 is a rare earth element added during smelting, and the R1 includes Nd and Dy;
  • the R2 is a rare earth element added during grain boundary diffusion, the R2 includes Tb, and the content of the R2 is 0.2-1%;
  • the type of M includes one or more of Ti, Ni, V, Nb, Ta, Cr, Mo, W, Mn, Zr, Hf, and Ag;
  • Fe 60-70%; the percentage is the mass percentage of the content of each component in the total mass of the raw material composition.
  • the content of R in the raw material composition is preferably 29 to 32.6%, such as 29.58%, 29.75%, 29.8%, 30.65%, 30.7%, 30.9%, 30.95%, 31.35% or 32.6% %, more preferably 29-31%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of Nd in R1 of the raw material composition can be conventional in the art, preferably 28 to 32.5%, such as 28.6%, 29.9%, 30.4% or 32.1%, and the percentage is The mass percentage of the total mass of the raw material composition.
  • the content of Dy in said R1 is preferably less than 0.3%, but not 0, such as 0.05%, 0.08%, 0.1%, 0.15% or 0.2%, preferably 0.1 to 0.2 %, the percentage is the mass percentage of the total mass of the raw material composition.
  • the R1 may also include other conventional rare earth elements in the art, for example, including one or more of Pr, Ho, Tb, Gd, and Y.
  • the addition form of Pr can be conventional in the art, for example, in the form of PrNd, or in the form of a mixture of pure Pr and pure Nd, or, in the form of "PrNd, pure Pr and pure Nd "Mixture" is added jointly.
  • Pr:Nd is preferably 25:75 or 20:80; when added in the form of a mixture of pure Pr and pure Nd, or when added as a mixture of "PrNd, pure Pr and pure Nd
  • the content of Pr is preferably 0.1-2%, for example 0.2%, and the percentage is the mass percentage of the content of each component in the total mass of the raw material composition.
  • the pure Pr or pure Nd in the present invention generally means that the purity is above 99.5%.
  • the content of Ho is preferably 0.1-0.2%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Gd is preferably 0.1-0.2%, and the percentage is a mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Y is preferably 0.1-0.2%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of R2 is preferably 0.2% to 0.9%, such as 0.2%, 0.3%, 0.5%, 0.6%, 0.8% or 0.9%, more preferably 0.2% to 0.8%, and the percentage is The mass percentage of the total mass of the raw material composition.
  • the content of Tb in the R2 is preferably 0.2-0.9%, such as 0.2%, 0.3%, 0.5%, 0.6%, 0.8% or 0.9%, more preferably 0.2-0.8%, percentage It is the mass percentage of the total mass of the raw material composition.
  • the R2 preferably further includes one or more of Pr, Dy, Ho and Gd.
  • the content of Pr is preferably less than 0.2%, but not 0, such as 0.1%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of Dy is preferably 0.3% or less, but not 0, such as 0.1%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of Ho is preferably 0.2% or less, but not 0, such as 0.1%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of Gd is preferably 0.2% or less, but not 0, such as 0.1%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of Co is preferably 0.45% or less, but not 0, such as 0.05%, 0.1%, 0.2%, 0.3%, 0.4% or 0.45%, more preferably 0.05-0.4%,
  • the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of M is preferably 0.08-0.35%, more preferably 0.1-0.15%, such as 0.08%, 0.1%, 0.16%, 0.2%, 0.25%, 0.3% or 0.35%, percentage It is the mass percentage of the total mass of the raw material composition.
  • the type of M is preferably one or more of Ti, Zr, Nb, Ni, V, Ta, Cr, Mo, W, Mn, Hf and Ag.
  • the content of Ti is preferably 0.05-0.3%, such as 0.05%, 0.1% or 0.3%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of Zr is preferably 0.08-0.35%, such as 0.08%, 0.2% or 0.35%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the Nb content is preferably 0.05-0.3%, such as 0.05%, 0.2% or 0.3%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the M in the raw material composition, preferably may further include one or more of Bi, Sn, Zn, Ga, In, Au and Pb.
  • the content of Ga is preferably greater than 0.2%, or less than 0.01%, but not 0, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the M element contains Ga, and Ga ⁇ 0.2%, preferably, Ti+Nb ⁇ 0.07% in the composition of the M element.
  • the raw material composition preferably further includes Al.
  • the content of Al is preferably below 0.2%, but not 0, such as 0.03 to 0.2%, such as 0.1%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the M contains Ga and Ga ⁇ 0.01%, preferably, Al+Ga+Cu ⁇ 0.11% in the composition of the M element.
  • the content of Cu is preferably 0.05 to 0.15%, for example, 0.05%, 0.06%, 0.07%, 0.08%, 0.1% or 0.15%; or the content of Cu is preferably below 0.08% , But not 0, such as 0.05%, 0.06% or 0.07%; the percentage is the mass percentage of the total mass of the raw material composition.
  • the method of adding Cu preferably includes adding during smelting and/or adding during grain boundary diffusion.
  • the content of Cu added during grain boundary diffusion is preferably 0.05 to 0.15%, and the percentage is a mass percentage of the total mass of the raw material composition.
  • the Cu is preferably added in the form of a PrCu alloy; wherein the mass percentage of the Cu to the PrCu is preferably 0.1-17%.
  • the content of B is preferably 0.97-1.1%, such as 0.99% or 1%, and the percentage is the mass percentage of the total mass of the raw material composition.
  • the content of Fe is preferably 65 to 79.5%, for example, 65.4%, 67.28%, 67.31%, 67.53%, 67.67%, 67.7%, 67.74%, 68.76%, 68.91% or 69%. It is the mass percentage of the total mass of the raw material composition.
  • the raw material composition preferably includes the following components: R: 29 to 32.6%; R includes R1 and R2, the R1 includes Nd and Dy, and the amount of Dy is 0.3% or less, but not 0, the R1 is a rare earth element added during smelting, the content of R2 is 0.2-1%, the R2 includes Tb, and the R2 is a rare earth element added during grain boundary diffusion; Co: 0.05-0.45% ; M: 0.08 ⁇ 0.35%, the M includes one or more of Ti, Nb and Zr; Cu: 0.05 ⁇ 0.15%; B: 0.97 ⁇ 1.1%; Fe: 65 ⁇ 79.5%; the percentages are for each group
  • the component content accounts for the mass percentage of the total mass of the raw material composition.
  • the raw material composition preferably includes the following components: R: 29-31%; R includes R1 and R2, said R1 includes Nd and Dy, and the amount of Dy is 0.1-0.2%, so
  • the R1 is a rare earth element added during smelting, the content of R2 is 0.2-0.8%, the R2 includes Tb, and the R2 is a rare earth element added during grain boundary diffusion; Co: 0.05-0.4%; M: 0.1 ⁇ 0.15%, the M includes one or more of Ti, Nb and Zr; Cu: less than 0.08% but not 0; B: 0.97-1.1%; Fe: 65-79.5%; the percentage is each component
  • the content accounts for the mass percentage of the total mass of the raw material composition.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 28.6%, Dy 0.05%, Pr 0.1%, and R1 is added during smelting R2 is Tb 1%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.05%; Ti 0.05%; Nb 0.2%; Cu 0.05%; B 0.99% and Fe 68.91%, the percentages are each The component content accounts for the mass percentage of the total mass of the raw material composition.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 28.6%, Dy 0.1%, Pr 0.2%, and R1 is added during smelting R2 is Tb 0.9%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.05%; Ti 0.1%; Cu 0.05%; B 1% and Fe 69%, the percentages are the content of each component The mass percentage of the total mass of the raw material composition.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 28.6%, Dy 0.08%, and R1 is a rare earth element added during smelting; R2 is Tb 0.9%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.1%; Ti 0.3%; Nb 0.05%; Ga 0.05%; Cu 0.06%; B 1.1% and Fe 68.76%, the percentages are each The component content accounts for the mass percentage of the total mass of the raw material composition.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 29.9%, Dy 0.1%, and the R1 is a rare earth element added during smelting; R2 is Tb 0.8%, Pr 0.1%, the R2 is rare earth element added during grain boundary diffusion; Co 0.1%; Zr 0.2%; Al 0.2%; Cu added during smelting is 0.03%, added during grain boundary diffusion Cu is 0.05%; B is 0.99% and Fe is 67.53%, and the percentages are the mass percentages of the content of each component in the total mass of the raw material composition.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 30.4%, Dy 0.05%, and R1 is a rare earth element added during smelting; R2 is Tb 0.8%, Dy 0.1%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.2%; Zr 0.08%; Cu 0.1%; B 0.99% and Fe 67.28%, the percentages are the content of each component The mass percentage of the total mass of the raw material composition.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 29.9%, Dy 0.15%, and R1 is a rare earth element added during smelting; R2 is Tb 0.6%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.2%; Zr 0.35%; Cu 0.1%; B 1% and Fe 67.7%, the percentages are the content of each component in the raw material combination The mass percentage of the total mass of the material.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 29.9%, Dy 0.2%, and R1 is a rare earth element added during smelting; R2 is Tb 0.6%, said R2 is the rare earth element added during grain boundary diffusion; Co 0.3%; Nb 0.05%; Ga 0.01%; Al 0.1%, Cu 0.07%; B 1.1% and Fe 67.67%, the percentages are each The component content accounts for the mass percentage of the total mass of the raw material composition.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 30.4%, Dy 0.05%, and R1 is a rare earth element added during smelting; R2 is Tb 0.3%, Pr 0.2%, the R2 is rare earth element added during grain boundary diffusion; Co 0.4%; Nb 0.2%; Cu added during melting is 0.12%, and Cu added during grain boundary diffusion is 0.03% B 0.99% and Fe 67.31%, the percentages are the mass percentages of the content of each component in the total mass of the raw material composition.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 32.1%, Dy 0.3%, and the R1 is a rare earth element added during smelting; R2 is Tb 0.2%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.45%; Nb 0.3%; Cu 0.15%; B 1.1% and Fe 65.4%, the percentages are the content of each component in the raw material combination The mass percentage of the total mass of the material.
  • the raw material composition of the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 29.9%, Dy 0.2%, and R1 is a rare earth element added during smelting; R2 is Tb 0.6%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.3%; Nb 0.05%; Ga 0.01%; Al 0.03%; Cu 0.07%; B 1.1% and Fe 67.74%, the percentages are each The component content accounts for the mass percentage of the total mass of the raw material composition.
  • the present invention also provides a preparation method of neodymium iron boron magnet material, which adopts the raw material composition as described above.
  • the preparation method is a conventional diffusion method in the art, wherein the R1 element is added in the smelting step, The R2 element is added in the grain boundary diffusion step.
  • the preparation method preferably includes the following steps: the elements other than R2 in the raw material composition of the neodymium iron boron magnet material are smelted, powdered, molded, and sintered to obtain a sintered body, and then the The mixture of the sintered body and the R2 may diffuse through the grain boundary.
  • the smelting operation and conditions can be a conventional smelting process in the field.
  • the elements other than R2 in the raw material composition of the neodymium iron boron magnet material are smelted and casted by ingot casting process and quick-setting sheet process. Obtain alloy flakes.
  • an additional 0-0.3wt% rare earth element (generally Is Nd element), the percentage is the mass percentage of the content of the additional rare earth element to the total content of the raw material composition; in addition, the content of this part of the additional rare earth element is not included in the scope of the raw material composition.
  • the smelting temperature may be 1300 to 1700°C, preferably 1450 to 1550°C.
  • the melting 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 solidification belt spinning furnace.
  • the operation and conditions of the pulverizing can be conventional pulverizing processes in the field, and generally include hydrogen crushing pulverizing and/or jet milling pulverizing.
  • the hydrogen crushing and pulverizing generally includes hydrogen absorption, dehydrogenation and cooling treatment.
  • the temperature of the hydrogen absorption is generally 20 to 200°C.
  • the temperature of the dehydrogenation is generally 400-650°C, preferably 500-550°C.
  • the pressure of the hydrogen absorption is generally 50-600 kPa, preferably 300-500 kPa.
  • the air-jet milling powder is generally carried out under the conditions of 0.1-2 MPa, preferably 0.5-0.7 MPa.
  • the gas stream in the gas stream milling powder can be, for example, nitrogen gas.
  • the time for the air jet milling can be 2 to 4 hours.
  • the molding operation and conditions can be conventional molding processes in the field.
  • the magnetic field forming method for example, the magnetic field forming method.
  • the magnetic field strength of the magnetic field forming method is generally above 1.5T.
  • the sintering operation and conditions can be conventional sintering processes in the field.
  • the sintering can be carried out under the condition that the degree of vacuum is lower than 0.5Pa.
  • the sintering temperature may be 1000-1200°C.
  • the sintering time may be 0.5-10h, preferably 2-5h.
  • the R2 is generally coated in the form of fluoride or a low melting point alloy, such as fluoride of Tb.
  • Dy is coated in the form of fluoride of Dy.
  • the R2 contains Pr
  • the Pr is added in the form of a PrCu alloy.
  • the mass of the Cu and the PrCu alloy is preferably 0.1-17%.
  • the timing of adding the Cu in the preparation method is preferably the grain boundary diffusion step, or it is added at the same time as the smelting step and the grain boundary diffusion step.
  • the operation and conditions of the grain boundary diffusion treatment can be a conventional grain boundary diffusion process in the art.
  • the temperature of the grain boundary diffusion may be 800-1000°C, for example 850°C.
  • the time for the grain boundary diffusion may be 5-20h, preferably 5-15h.
  • a low-temperature tempering treatment is also performed according to the conventional practice in the art.
  • the temperature of the low-temperature tempering treatment may generally be 460-560°C.
  • the low-temperature tempering time can generally be 1 to 3 hours.
  • the invention also provides a neodymium iron boron magnet material prepared by the above preparation method.
  • the present invention also provides a neodymium iron boron magnet material, which includes the following components by mass content: R: 28-33%; said R includes R1 and R2, said R1 includes Nd and Dy, and said R2 includes Tb. ; The content of R2 is 0.2-1wt%;
  • the type of M includes one or more of Ti, Ni, V, Nb, Ta, Cr, Mo, W, Mn, Zr, Hf, and Ag;
  • Fe 60-70%; the percentage is the mass percentage of the mass of each component to the total mass of the neodymium iron boron magnet material;
  • the neodymium iron boron magnet material comprises Nd 2 Fe l4 B crystal grains and its shell layer, two grain boundaries adjacent to the Nd 2 Fe l4 B crystal grains and a grain boundary triangle region; wherein the heavy rare earth elements in R1 are mainly distributed In the Nd 2 Fe 14 B crystal grains, R2 is mainly distributed in the shell layer, the two-grain boundary and the grain boundary triangle area, and the area of the grain boundary triangle area accounts for 1.8 to 2.99%; the two-grain grain boundary The continuity of the grain boundary is more than 96%; the mass ratio of C and O in the triangular region of the grain boundary is 0.4-0.5%; the mass ratio of C and O in the two-grain grain boundary is 0.3-0.5%.
  • the heavy rare earth elements in R1 are mainly distributed in Nd 2 Fe l4 B crystal grains
  • Nd 2 Fe l4 B crystal grains can be understood as the main distribution of heavy rare earth elements in R1 caused by the conventional smelting and sintering process in this field (generally refers to more than 95wt% )
  • R2 is mainly distributed in the shell layer
  • R2 caused by the conventional grain boundary diffusion process in this field is mainly distributed (generally means more than 95wt%) in the shell layer and the second particle of the Nd 2 Fe l4 B crystal grains.
  • a small part of the grain boundary and the grain boundary triangle area will also diffuse into the Nd 2 Fe l4 B crystal grains, for example, at the outer edge of the Nd 2 Fe l4 B crystal grain.
  • the calculation method of the grain boundary continuity refers to the length occupied by phases other than voids in the grain boundary (phases such as B-rich phase, rare earth-rich phase, rare earth oxide, rare earth carbide, etc.) and The ratio of the total grain boundary length. Grain boundary continuity of more than 96% can be called continuous channel.
  • the grain boundary triangle area generally refers to a place where three or more grain boundary phases intersect, and there are B-rich phases, rare earth-rich phases, rare earth oxides, rare earth carbides, and cavities distributed.
  • the calculation method of the area ratio of the grain boundary triangle area refers to the ratio of the area of the grain boundary triangle area to the total area of the "grains and grain boundaries".
  • rare earth oxides and rare earth carbides are mainly produced by the C and O elements introduced during the preparation process. Due to the high content of rare earths in the grain boundaries, C and O are usually more distributed in the grain boundaries in the magnet material, so they exist in the form of rare earth carbides and rare earth oxides, respectively.
  • C and O elements are introduced in conventional ways in the field, generally impurity introduction or atmosphere introduction. Specifically, for example, in the process of jet milling and pressing, additives are introduced. During sintering, these elements will be heated by heating. Additives are removed, but a small amount of C and O elements will inevitably remain; for another example, a small amount of O elements will inevitably be introduced due to the atmosphere in the preparation process.
  • the content of C and O in the final NdFeB magnet material product obtained after testing is only below 1000 ppm and 1200 ppm respectively, which belong to the category of conventional acceptable impurities in the field, so they are not included in the product element statistical table.
  • the area of the grain boundary triangle area is preferably 1.96 to 2.99%, such as 1.96%, 1.98%, 2.05%, 2.36%, 2.41%, 2.54%, 2.73%, 2.78%, 2.83% or 2.99%.
  • the grain boundary continuity is preferably 97% or more, for example, 97.85%, 97.92%, 98.01%, 98.03%, 98.03%, 98.07%, 98.12%, 98.13%, 98.18% or 98.54%, more Preferably, it is above 98%.
  • the mass ratio of C and O in the grain boundary triangle region is preferably 0.41 to 0.49%, for example, 0.41%, 0.44%, 0.45%, 0.46%, 0.47%, 0.48%, or 0.49%. , More preferably 0.41 to 0.48%, the percentage is the ratio of the mass of C and O in the triangular region of the grain boundary to the total mass of all elements in the grain boundary.
  • the mass ratio of C and O in the two-grain boundary is preferably 0.3-0.4%, such as 0.3%, 0.34%, 0.35%, 0.36%, 0.37%, 0.38% or 0.4%, More preferably, it is 0.34-0.4%, and the percentage is the ratio of the mass of C and O in the grain boundary of the two particles to the total mass of all elements in the grain boundary.
  • C and O elements usually exist in the form of rare earth carbides and rare earth oxides in the grain boundary phase, so "the mass ratio of C and O in the grain boundary triangle area" and " The mass ratios of C and O in the grain boundaries of the two grains correspond to heterogeneous rare earth carbides and rare earth oxides, respectively.
  • the difference is smaller than the comparison ratio, and it can be obtained.
  • a new phase is also detected in the two-particle grain boundary,
  • the chemical composition of the new phase is: R x (Fe+Co) 100-xyz Cu y M z , wherein R in R x (Fe+Co) 100-xyz Cu y M z includes Nd, Dy and Tb M includes one or more of Ti, Ni, V, Nb, Ta, Cr, Mo, W, Mn, Zr, Hf, Zn and Ag; x is 78-81; y It is 0.4 to 0.8; z is 0.1 or less, but not 0.
  • R x (Fe+Co) 100-xyz Cu y M z x is preferably 78.89 to 80.8, y is preferably 0.55 to 0.66, and z is preferably 0.02 to 0.06.
  • the structure of the new phase is, for example, R 79.43 (Fe+Co) 19.92 Cu 0.63 M 0.02 , R 78.89 (Fe+Co) 20.49 Cu 0.58 M 0.04 , R 80.72 (Fe+Co) Co) 18.68 Cu 0.55 M 0.05 , R 79.21 (Fe+Co) 20.11 Cu 0.66 M 0.02 , R 80.09 (Fe+Co) 19.22 Cu 0.65 M 0.04 , R 79.04 (Fe+Co) 20.31 Cu 0.61 M 0.04 , R 79.76 ( Fe+Co) 19.64 Cu 0.58 M 0.02 , R 79.71 (Fe+Co) 19.65 Cu 0.62 M 0.02 , R 80.18 (Fe+Co) 19.16 Cu 0.62 M 0.04 , R 79.4 (Fe+Co) 19.94 Cu 0.64 M 0.02 .
  • the chemical composition is R x (Fe+Co) 100-xyz Cu y M z .
  • the area of the new phase in the two-grain boundaries is better than the total area of the two-grain boundaries. 0.2-2.6%, such as 0.21%, 0.34%, 0.85%, 1.08%, 1.15%, 1.21%, 1.33%, 1.87%, 2.34% or 2.55%, more preferably 0.34-2.55%.
  • the inventor speculates that the new phase is formed at the grain boundary of the two particles, so the continuity of the grain boundary is further improved, thereby improving the performance of the magnet.
  • the content of R in the neodymium iron boron magnet material is preferably 29 to 32.6%, such as 29.58%, 29.75%, 29.8%, 30.65%, 30.7%, 30.9%, 30.95%, 31.35 % Or 32.6%, more preferably 29-31%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the Nd content in the R1 of the neodymium iron boron magnet material, can be conventional in the art, preferably 28 to 32.5%, such as 28.6%, 29.9%, 30.4% or 32.1%, and the percentage is It accounts for the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Dy is preferably less than 0.3%, but not 0, such as 0.05%, 0.08%, 0.1%, 0.15%, 0.2% or 0.3 %, preferably 0.1-0.2%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the R1 may also include other conventional rare earth elements in the art, for example, including one or more of Pr, Ho, Tb, Gd, and Y.
  • the addition form of Pr can be conventional in the art, for example, in the form of PrNd, or in the form of a mixture of pure Pr and pure Nd, or, in the form of "PrNd, pure Pr and pure Nd "Mixture" is added jointly.
  • Pr:Nd is preferably 25:75 or 20:80; when added in the form of a mixture of pure Pr and pure Nd, or when added as a mixture of "PrNd, pure Pr and pure Nd
  • the content of the Pr is preferably 0.1-2%, for example 0.2%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the pure Pr or pure Nd in the present invention generally refers to a purity of 99.5% or more.
  • the content of Ho is preferably 0.1-0.2%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Gd is preferably 0.1-0.2%, and the percentage is a mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Y is preferably 0.1-0.2%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of R2 is preferably 0.2 to 0.9%, such as 0.2%, 0.3%, 0.5%, 0.6% or 0.8%, more preferably 0.2 to 0.8%, and the percentage is based on the neodymium iron The mass percentage of the total mass of the boron magnet material.
  • the content of Tb in the R2 is preferably 0.2-0.9%, such as 0.2%, 0.3%, 0.5%, 0.6%, 0.8% or 0.9%, more preferably 0.2-0.8%, percentage It is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the R2 preferably further includes one or more of Pr, Dy, Ho and Gd.
  • the content of Pr is preferably less than 0.2%, for example 0.1%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Dy is preferably 0.3% or less, for example 0.1%, and the percentage is a mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Ho is preferably 0.2% or less, for example 0.1%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Gd is preferably less than 0.2%, such as 0.1%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Co is preferably 0.45% or less, but not 0, such as 0.05%, 0.1%, 0.2%, 0.3% or 0.4%, more preferably 0.05 to 0.4%, and the percentage is The mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of M is preferably 0.08-0.35%, such as 0.08%, 0.1%, 0.16%, 0.2%, 0.25%, 0.3% or 0.35%, more preferably 0.1-0.15%, percentage It is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the type of M is preferably one or more of Ti, Zr, Nb, Ni, V, Ta, Cr, Mo, W, Mn, Hf and Ag.
  • the content of Ti is preferably 0.05-0.3%, such as 0.1%, and the percentage is a mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Zr is preferably 0.08-0.35%, such as 0.2%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the Nb content is preferably 0.05-0.3%, for example 0.2%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the M in the neodymium iron boron magnet material, the M preferably further includes one or more of Bi, Sn, Zn, Ga, In, Au and Pb.
  • the content of Ga is preferably more than 0.2%, but not 0, or less than 0.01%, but not 0, and the percentage is based on the total neodymium iron boron magnet material. The mass percentage of mass.
  • the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the neodymium iron boron magnet material preferably further includes Al.
  • the content of Al is preferably less than 0.2%, but not 0, such as 0.03 to 0.2%, such as 0.1%, and the percentage is a mass percentage of the total mass of the neodymium iron boron magnet material.
  • the M contains Ga and Ga ⁇ 0.01%, preferably, Al+Ga+Cu ⁇ 0.11% in the composition of the M element, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Cu is preferably 0.05 to 0.15%, for example, 0.05%, 0.07%, 0.08%, 0.1% or 0.15%; or, the content of Cu is preferably less than 0.08%, but It is not 0, such as 0.05%, 0.07% or 0.08%; the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the method of adding Cu preferably includes adding during smelting and/or adding during grain boundary diffusion.
  • the content of Cu added during the grain boundary diffusion is preferably 0.03 to 0.15%, such as 0.05%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material
  • the Cu is preferably added in the form of a PrCu alloy, wherein the mass percentage of the Cu in the PrCu is preferably 0.1-17%.
  • the content of B is preferably 0.97-1.1%, such as 0.99% or 1%, and the percentage is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the content of Fe is preferably 65 to 79.5%, for example, 65.4%, 67.28%, 67.31%, 67.53%, 67.67%, 67.7%, 67.74%, 68.76%, 68.91% or 69%. It is the mass percentage of the total mass of the neodymium iron boron magnet material.
  • the neodymium iron boron magnet material preferably includes the following components by mass: R: 29 to 32.6%; R includes R1 and R2, said R1 includes Nd and Dy, and the amount of Dy is 0.3 % Or less but not 0, the R1 is a rare earth element added during smelting, the content of R2 is 0.2-1%, the R2 includes Tb, and the R2 is a rare earth element added during grain boundary diffusion; Co: 0.05 ⁇ 0.45%; M: 0.08 ⁇ 0.35%, the type of M includes one or more of Ti, Nb and Zr; Cu: 0.05 ⁇ 0.15%; B: 0.97 ⁇ 1.1%; Fe: 65 ⁇ 79.
  • the percentage is the mass percentage of the content of each component in the total mass of the neodymium iron boron magnet material; the neodymium iron boron magnet material includes Nd 2 Fe l4 B crystal grains and its shell layer, adjacent to the Nd 2 Fe l4 B The two-grain grain boundary and the grain boundary triangle area of the crystal grains; wherein the heavy rare earth elements in R1 are mainly distributed in the Nd 2 Fe 14 B crystal grains, and R2 is mainly distributed in the shell layer, the two-grain grain boundary and the grain boundary triangle area, The area ratio of the triangular area of the grain boundary is 1.96 to 2.99%; the continuity of the grain boundary of the two-grain grain boundary is more than 97%; the mass ratio of C and O in the triangular area of the grain boundary is 0.41 to 0.49 %; The mass ratio of C and O in the two-grain boundary is 0.3-0.4%; the two-grain boundary contains a new phase, and the chemical composition of the new phase is: R x (
  • the neodymium iron boron magnet material preferably includes the following components by mass: R: 29-31%; R includes R1 and R2, said R1 includes Nd and Dy, and the amount of Dy is 0.1 ⁇ 0.2%, the R1 is a rare earth element added during smelting, the content of R2 is 0.2-0.8%, the R2 includes Tb, and the R2 is a rare earth element added during grain boundary diffusion; Co: 0.05 ⁇ 0.4 %; M: 0.1 to 0.15%, the type of M includes one or more of Ti, Nb and Zr; Cu: 0.08% or less but not 0; B: 0.97 to 1.1%; Fe: 65 to 79.5 %; The percentage is the mass percentage of the content of each component in the total mass of the neodymium iron boron magnet material; the neodymium iron boron magnet material includes Nd 2 Fe l4 B crystal grains and its shell layer, adjacent to the Nd 2 Fe l4 B The two-grain grain boundary and
  • the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 28.6%, Dy 0.05%, Pr 0.1%, and R1 is a rare earth element added during smelting; R2 is Tb 1%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.05%; Ti 0.05%; Nb 0.2%; Cu 0.05%; B 0.99% and Fe 68.91%, the percentage is the content of each component
  • the neodymium iron boron magnet material includes the following components by mass content: R1 is Nd 28.6%, Dy 0.1%, Pr 0.2%, and R1 is a rare earth element added during smelting; R2 is Tb 0.9%, the R2 is the rare earth element added during grain boundary diffusion; Co 0.05%; Ti 0.1%; Cu 0.05%; B 1% and Fe 69%, the percentages are the content of each component in the neodymium iron
  • the mass percentage of the total mass of the boron magnet material; the neodymium iron boron magnet material comprises Nd 2 Fe l4 B crystal grains and its shell layer, two grain boundaries adjacent to the Nd 2 Fe l4 B crystal grains and a grain boundary triangle region;
  • the heavy rare earth elements in R1 are mainly distributed in Nd 2 Fe 14 B crystal grains, and R2 is mainly distributed in the shell layer, the two-grain boundary and the grain boundary triangle area, and the area of the grain boundary triangle area accounts for 2.05%
  • the neodymium iron boron magnet material includes the following components by mass: R1 is Nd 28.6%, Dy 0.08%, R1 is rare earth element added during smelting; R2 is Tb 0.9 %, the R2 is the rare earth element added during grain boundary diffusion; Co 0.1%; Ti 0.3%; Nb 0.05%; Ga 0.05%; Cu 0.06%; B 1.1% and Fe 68.76%, the percentage is the content of each component It accounts for the mass percentage of the total mass of the neodymium iron boron magnet material; the neodymium iron boron magnet material comprises Nd 2 Fe l4 B crystal grains and its shell, two grain boundaries adjacent to the Nd 2 Fe l4 B crystal grains and The grain boundary triangle region; wherein the heavy rare earth elements in R1 are mainly distributed in the Nd 2 Fe 14 B crystal grains, and R2 is mainly distributed in the shell layer, the two-grain grain boundary and the grain boundary triangle region, and the area of
  • the neodymium iron boron magnet material includes the following components by mass: R1 is Nd 29.9%, Dy 0.1%, the R1 is the rare earth element added during smelting; R2 is Tb 0.8 %, Pr 0.1%, the R2 is a rare earth element added during grain boundary diffusion; Co 0.1%; Zr 0.2%; Al 0.2%; Cu added during smelting is 0.03%, and Cu added during grain boundary diffusion is 0.05% B 0.99% and Fe 67.53%, the percentages are the mass percentages of the content of each component in the total mass of the neodymium iron boron magnet material; the neodymium iron boron magnet material includes Nd 2 Fe l4 B crystal grains and its shell layer, adjacent The two-grain boundary and the triangular area of the grain boundary of the Nd 2 Fe l4 B crystal grains; wherein the heavy rare earth elements in R1 are mainly distributed in the Nd 2 Fe 14 B crystal grains, and R2 is mainly
  • the area of the grain boundary and the grain boundary triangle area accounts for 1.96%; the grain boundary continuity of the two-grain grain boundary is 97.85%; the mass ratio of C and O in the grain boundary triangle area
  • the mass ratio of C and O in the two-grain boundary is 0.36%;
  • the two-grain boundary contains a new phase, and its chemical composition is R 79.21 (Fe+Co) 20.11 Cu 0.66 M 0.02 , R It is one or more of Nd, Dy, Pr and Tb, and M is Zr; the ratio of the area of the new phase in the two-grain boundary to the total area of the two-grain boundary is 2.55%.
  • the neodymium iron boron magnet material includes the following components by mass: R1 is Nd 30.4%, Dy 0.05%, R1 is rare earth element added during smelting; R2 is Tb 0.8 %, Dy 0.1%, the R2 is the rare earth element added during the grain boundary diffusion; Co 0.2%; Zr 0.08%; Cu 0.1%; B 0.99% and Fe 67.28%, the percentage is that the content of each component accounts for the neodymium iron
  • the mass percentage of the total mass of the boron magnet material; the neodymium iron boron magnet material comprises Nd 2 Fe l4 B crystal grains and its shell layer, two grain boundaries adjacent to the Nd 2 Fe l4 B crystal grains and a grain boundary triangle region;
  • the heavy rare earth elements in R1 are mainly distributed in the Nd 2 Fe 14 B crystal grains, and R2 is mainly distributed in the shell layer, the two-grain grain boundary and the grain boundary triangle area, and the area of the grain boundary triangle area accounts
  • the neodymium iron boron magnet material includes the following components by mass: R1 is Nd 29.9%, Dy 0.15%, R1 is rare earth element added during smelting; R2 is Tb 0.6 %, the R2 is the rare earth element added during grain boundary diffusion; Co 0.2%; Zr 0.35%; Cu 0.1%; B 1% and Fe 67.7%, the percentage is that the content of each component accounts for the total neodymium iron boron magnet material
  • the mass percentage of the mass; the neodymium iron boron magnet material includes Nd 2 Fe l4 B crystal grains and its shell layer, two grain boundaries adjacent to the Nd 2 Fe l4 B crystal grains and the grain boundary triangle region; wherein the R1 in The heavy rare earth elements are mainly distributed in Nd 2 Fe 14 B crystal grains, and R2 is mainly distributed in the shell layer, the two-grain boundary and the grain boundary triangle area, and the area of the grain boundary triangle area accounts for 2.73%;
  • the neodymium iron boron magnet material includes the following components by mass: R1 is Nd 29.9%, Dy 0.2%, R1 is rare earth element added during smelting; R2 is Tb 0.6 %, the R2 is the rare earth element added during grain boundary diffusion; Co 0.3%; Nb 0.05%; Ga 0.01%; Al 0.1%; Cu 0.07%; B 1.1% and Fe 67.67%, the percentage is the content of each component
  • the neodymium iron boron magnet material includes the following components by mass: R1 is Nd 30.4%, Dy 0.05%, R1 is rare earth element added during smelting; R2 is Tb 0.3 %, the R2 is the rare earth element added during grain boundary diffusion; Co 0.4%; Nb 0.2%; Cu added during smelting is 0.12%, Cu added during grain boundary diffusion is 0.03; B is 0.99% and Fe 67.31%, The percentage is the mass percentage of the content of each component in the total mass of the neodymium iron boron magnet material; the neodymium iron boron magnet material comprises Nd 2 Fe 14 B crystal grains and its shell layer, adjacent to the Nd 2 Fe 14 B crystal grains The two-grain boundary and the triangular area of the grain boundary; wherein the heavy rare earth elements in R1 are mainly distributed in the Nd 2 Fe l4 B crystal grains, and R2 is mainly distributed in the shell layer, the two-grain boundary and the triangular area of the grain boundary; where
  • the area ratio of the grain boundary triangle region is 2.36%; the grain boundary continuity of the two-grain grain boundary is 98.12%; the mass ratio of C and O in the grain boundary triangle region is 0.48%; the two-grain crystal The mass ratio of C and O in the boundary is 0.38%; the two-grain boundary contains a new phase with a chemical composition of R 79.71 (Fe+Co) 19.65 Cu 0.62 M 0.02 , and R is one of Nd, Dy, and Tb.
  • M is Nb; the ratio of the area of the new phase in the two-particle grain boundary to the total area of the two-particle grain boundary is 1.08%.
  • the neodymium iron boron magnet material includes the following components by mass: R1 is Nd 32.1%, Dy 0.3%, R1 is rare earth element added during smelting; R2 is Tb 0.2 %, the R2 is the rare earth element added during grain boundary diffusion; Co 0.45%; Nb 0.3%; Cu 0.15%; B 1.1% and Fe 65.4%, the percentage is that the content of each component accounts for the total neodymium iron boron magnet material
  • the mass percentage of the mass; the neodymium iron boron magnet material includes Nd 2 Fe l4 B crystal grains and its shell layer, two grain boundaries adjacent to the Nd 2 Fe l4 B crystal grains and the grain boundary triangle region; wherein the R1 in The heavy rare earth elements are mainly distributed in the Nd 2 Fe 14 B crystal grains, and R2 is mainly distributed in the shell layer, the grain boundary of the two grains and the grain boundary triangle area, and the area of the grain boundary triangle area accounts for 2.99%;
  • the neodymium iron boron magnet material includes the following components by mass: R1 is Nd 29.9%, Dy 0.2%, R1 is rare earth element added during smelting; R2 is Tb 0.6 %, the R2 is the rare earth element added during grain boundary diffusion; Co 0.3%; Nb 0.05%; Ga 0.01%; Al 0.03%; Cu 0.07%; B 1.1% and Fe 67.74%, the percentage is the content of each component
  • the neodymium iron boron magnet material provided by the present invention reasonably controls the total rare earth content TRE, Co, Cu and the content range of M (Ti, Nb, Zr, etc.) elements, and combines the specific feeding timing of heavy rare earth elements to make more miscellaneous phases.
  • the invention also provides an application of the neodymium iron boron magnet material described above in the preparation of magnetic steel.
  • the magnetic steel is preferably 54SH, 54UH, 56SH magnetic steel.
  • the reagents and raw materials used in the present invention are all commercially available.
  • the positive progress effect of the present invention is that the neodymium iron boron magnet material of the present invention can be used in comparison with the existing neodymium iron boron through the combination of the specific content of multiple elements, under the premise of only adding a small amount of Co and a small amount of heavy rare earth elements.
  • the proportion of impurity phases (rare earth oxides, rare earth carbides) in the two-grain boundary phase is increased, and new phases are formed in the two-grain boundary; correspondingly, the two-grain boundary Continuity, reducing the proportion of phases in the grain boundary triangle area, and correspondingly reducing the area of the grain boundary triangle area.
  • FIG. 1 is an EPMA microstructure diagram of the neodymium iron boron magnet material of Example 4.
  • FIG. The point indicated by arrow 1 in the figure is the new phase of R x (Fe+Co) 100-xyz Cu y M z contained in the grain boundary of the two grains, the position indicated by arrow 2 is the triangular area of the grain boundary, and the arrow 3 indicates The position is the main phase of Nd 2 Fe l4 B.
  • Table 1 The formula and content of the raw material composition of the neodymium iron boron magnet material (wt%)
  • Airflow milling process Under nitrogen atmosphere, the powder after hydrogen pulverization is pulverized by airflow milling for 3 hours under the condition of 0.6 MPa in the pulverizing chamber to obtain fine powder.
  • each molded body is moved to a sintering furnace for sintering, sintered under a vacuum of less than 0.5 Pa, and sintered at 1030-1090°C for 2 to 5 hours to obtain a sintered body.
  • Grain boundary diffusion process after the surface of the sintered body is purified, R2 (such as Tb alloy or fluoride, Dy alloy or fluoride and PrCu alloy, The diffusion step is added at the same time) coating on the surface of the sintered body and diffusing at a temperature of 850°C for 5-15 hours, then cooling to room temperature, and then performing low-temperature tempering treatment at a temperature of 460-560°C for 1-3 hours.
  • R2 such as Tb alloy or fluoride, Dy alloy or fluoride and PrCu alloy
  • Magnetic performance test The sintered magnet is tested on the magnetic performance of the PFM-14 magnetic performance measuring instrument from British Hirs company.
  • the tested magnetic properties include the remanence at 20°C and 120°C, and the coercivity at 20°C and 120°C. , And the corresponding temperature coefficient of remanence.
  • the formula for calculating the temperature coefficient of remanence is: (Br high temperature- Br normal temperature )/(Br normal temperature (high temperature-normal temperature)) ⁇ 100%, and the test results are shown in Table 3 below.
  • FE-EPMA detection polishing the vertical orientation surface of the neodymium iron boron magnet material, using the field emission electron probe microanalyzer (FE-EPMA) (JEOL, 8530F) to detect. Test the area ratio of the grain boundary triangle area, the continuity of the two grain boundaries, the mass ratio of C and O, and the new phase. The test results are shown in Table 3 below.
  • the continuity of the two-grain boundary is calculated based on EPMA's backscattering picture; the mass proportion of C and O in the two-grain boundary and the triangular area of the grain boundary and the new phase are measured by the elemental analysis of EPMA.
  • the area ratio of the grain boundary triangle area refers to the ratio of the area of the grain boundary triangle area to the total area of "grains and grain boundaries”.
  • the continuity of the two grain boundaries refers to the length occupied by the phases other than voids in the grain boundaries (phases such as B-rich phase, rare-earth-rich phase, rare-earth oxide, rare-earth carbide, etc.) and total The ratio of the grain boundary length.
  • the mass ratio of C and O in the grain boundary triangle area refers to the ratio of the mass of C and O in the grain boundary triangle area to the total mass of all elements in the grain boundary.
  • the mass ratio of C and O in the two-grain boundary refers to the ratio of the mass of C and O in the two-grain boundary to the total mass of all elements in the grain boundary.
  • the area ratio (%) of the new phase in the two-grain boundary refers to the ratio of the area of the new phase in the two-grain boundary to the total area of the two-grain boundary.
  • ⁇ means that the two-grain boundary phase does not contain a new phase with a chemical composition of R x (Fe+Co) 100-xyz Cu y M z .
  • the present invention can achieve a level equivalent to the current addition of a large amount of Co and heavy rare earth elements by adding a small amount of Co and heavy rare earth elements.
  • C and O are more distributed in the grain boundaries and exist in the form of rare earth carbides and rare earth oxides, respectively.
  • FIG. 1 it is the EPMA microstructure diagram of the neodymium iron boron magnet material prepared in Example 4.
  • the point indicated by arrow 1 in the figure is the new phase of R x (Fe+Co) 100-xyz Cu y M z contained in the two-grain grain boundary (light gray area), and the position indicated by arrow 2 is the triangular area of the grain boundary (Silver white area), the position indicated by arrow 3 is the main phase of Nd 2 Fe l4 B (dark gray area).
  • the area of the grain boundary triangle region is smaller than that of conventional magnet materials.

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Abstract

L'invention concerne un matériau d'aimant neodyme-fer-bore, une composition de matière première, son procédé de préparation et son utilisation. La composition de matière première comprend : R : 28 à 33 %, R étant des éléments des terres rares et comprenant R1 et R2, R1 étant un élément des terres rares ajouté pendant la fusion, R1 comprenant Nd et Dy, R2 étant un élément de terre rare ajouté pendant la diffusion de limite de grain, R2 comprenant Tb, et la teneur en R2 étant de 0,2 à 1 % ; Co : < 0,5% mais pas 0 ; M : ≤ 0,4 % mais pas 0, M comprenant un ou plusieurs éléments parmi Ti, Ni, V, Nb, Ta, Cr, Mo, W, Mn, Zr, Hf et Ag ; Cu : ≤ 0,15 % mais pas 0 ; B : 0,9 à 12 % ; Fe : 60 à 70 % ; les pourcentages étant les pourcentages en poids occupés par chaque composant dans la composition de matière première. Le matériau magnétique de la présente invention présente les avantages d'une rémanence élevée, d'une coercivité élevée et d'excellentes performances à haute température.
PCT/CN2021/077171 2020-02-26 2021-02-22 Matériau d'aimant neodyme-fer-bore, composition de matière première, son procédé de préparation et son utilisation WO2021169886A1 (fr)

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