EP4379755A1 - Samarium-basiertes seltenerd-permanentmagnetmaterial und herstellungsverfahren dafür und anwendung davon - Google Patents

Samarium-basiertes seltenerd-permanentmagnetmaterial und herstellungsverfahren dafür und anwendung davon Download PDF

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Publication number
EP4379755A1
EP4379755A1 EP23826088.9A EP23826088A EP4379755A1 EP 4379755 A1 EP4379755 A1 EP 4379755A1 EP 23826088 A EP23826088 A EP 23826088A EP 4379755 A1 EP4379755 A1 EP 4379755A1
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Prior art keywords
samarium
powder
permanent magnet
earth permanent
heat treatment
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EP23826088.9A
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English (en)
French (fr)
Inventor
Yuping Li
Yongyang SUN
Yuntao Jiang
Yunyi ZHANG
Changzheng GUO
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Hengdian Group DMEGC Magnetics Co Ltd
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Hengdian Group DMEGC Magnetics 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
    • 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
    • H01F1/059—Alloys characterised by their composition containing rare earth metals and magnetic transition metals, e.g. SmCo5 and Va elements, e.g. Sm2Fe17N2
    • 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
    • H01F1/06—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 in the form of particles, e.g. powder
    • H01F1/08—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 in the form of particles, e.g. powder pressed, sintered, or bound together
    • 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
    • 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
    • H01F41/026—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 protecting methods against environmental influences, e.g. oxygen, by surface treatment
    • 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

Definitions

  • Examples of the present application relate to the technical field of magnetic materials, for example, a permanent magnet material, a preparation method therefor and an application thereof, and specifically, a samarium-based rare-earth permanent magnet material, a preparation method therefor and an application thereof.
  • Neodymium-iron-boron rare-earth permanent magnet materials are widely used in fields of vehicles, household appliances and industrial equipment due to the advantages of superhigh remanence, high coercivity and high magnetic energy product.
  • Samarium-based rare-earth permanent magnet materials represented by a Sm 2 Fe 17 N x compound, have a higher Curie temperature, higher anisotropy field and similar saturation magnetization compared with the NdFeB permanent magnet materials, and are regarded as having the potential to become a new generation of permanent magnet materials.
  • the temperature is more than or equal to 550°C, the Sm 2 Fe 17 N x compound will be irreversibly decomposed, and the magnetic properties will be greatly reduced.
  • CN105355354A discloses a samarium-iron-nitrogen-based anisotropic rare-earth permanent magnet powder and a preparation method therefor.
  • a 2:17-type main phase providing magnetism is wrapped by a low-melting phase composed of element R and element M2, which can not only accommodate excess rare-earth elements in the alloy without forming a SmFe 2 phase or a SmFe 3 phase, but also help the 2: 17-type main-phase grains to eliminate defects, reduce antiphase boundary nucleation sites and decoupling effect.
  • the oxidation resistance and magnetic properties of this magnetic powder are still required to be further improved.
  • CN108994311A discloses a preparation method for an anisotropic high-performance samarium-iron-nitrogen permanent magnet alloy powder by solid salt spray granulation and reduction diffusion method, which comprises steps: preparing and mixing raw materials; performing spray granulation; mixing microspheres obtained in the previous step with calcium particles, and performing a reduction diffusion reaction to obtain a samarium-iron alloy; and performing a nitriding treatment to obtain the product.
  • the samarium-iron-nitrogen permanent magnet alloy powder obtained by spray granulation in this application has high coercivity, but the magnetic powder is difficult to be cleaned with water after the nitriding, which has a great impact on the subsequent granulation, and chloride is adopted in the spray granulation and easy to corrode equipment.
  • CN111403165A discloses a preparation method for a samarium-iron-nitrogen/nano-iron composite bonded permanent magnet.
  • this method by using chemical vapor deposition method, a layer of nano-Fe film is coated on the surface of a samarium-iron-nitrogen powder for an oxidation resistant coating treatment, and the powder is subjected to granulation and then injection molding or calendering, mold-pressing and extrusion to prepare the composite bonded magnet.
  • This bonded magnet has a high oxidation resistance but also a complicated preparation process, and the overall magnetic performance of the prepared bonded magnet is poor.
  • An example of the present application provides a samarium-based rare-earth permanent magnet material, a preparation method therefor and an application thereof.
  • a samarium-based rare-earth permanent magnet material By the introduction of vanadium element, copper element and molybdenum element, an intrinsic property and a microstructure of the samarium-based rare-earth permanent magnet material can be adjusted, thereby improving the overall magnetic performance of the samarium-based rare-earth permanent magnet material, and the preparation process is simple and economical.
  • an example of the present application provides a samarium-based rare-earth permanent magnet material, and the samarium-based rare-earth permanent magnet material has a composition in an atomic ratio: Sm 2 Fe ⁇ Cu ⁇ V ⁇ Mo ⁇ N ⁇ , wherein 11.5 ⁇ ⁇ ⁇ 17.5, 0.1 ⁇ ⁇ ⁇ 0.4, 1.0 ⁇ ⁇ ⁇ 1.8, 0 ⁇ ⁇ ⁇ 1.0, and 2.9 ⁇ ⁇ ⁇ 4.0.
  • composition Sm 2 Fe ⁇ Cu ⁇ V ⁇ Mo ⁇ N ⁇ of the samarium-based rare-earth permanent magnet material 11.5 ⁇ ⁇ ⁇ 17.5, which can be, for example, 11.5, 12.5, 13.5, 14.5, 15.5, 16.5 or 17.5; however, the ⁇ is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • 0.1 ⁇ ⁇ ⁇ 0.4 which can be, for example, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35 or 0.4; however, the ⁇ is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • 1.0 ⁇ ⁇ ⁇ 1.8 which can be, for example, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7 or 1.8; however, the ⁇ is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • composition Sm 2 Fe ⁇ Cu ⁇ V ⁇ Mo ⁇ N ⁇ of the samarium-based rare-earth permanent magnet material 0 ⁇ ⁇ ⁇ 1.0, which can be, for example, 0, 0.2, 0.4, 0.6, 0.8 or 1.0; however, the ⁇ is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the microstructure of the material such as grain boundaries, grain sizes or lattice defects are changed by doping the vanadium element, copper element and molybdenum element based on a samarium-iron-nitrogen rare-earth permanent magnet material, and by controlling an appropriate range of the atomic ratio, the samarium-based rare-earth permanent magnet material has excellent overall magnetic performance and oxidation resistance, which can meet the performance requirements of rare-earth permanent magnet materials.
  • an example of the present application provides a preparation method for the samarium-based rare-earth permanent magnet material according to the first aspect, and the preparation method comprises the following steps:
  • the preparation method for the samarium-based rare-earth permanent magnet material provided in the present application, by regulating parameters of the nitriding process, controlling a particle size of the ball-milling, and using the processes of phosphating and heat treatment at the same time, the oxidation resistant of the samarium-based rare-earth permanent magnet material can be effectively improved, and the remanence and coercivity are promoted to achieve a good balance, so that excellent overall magnetic performance can be obtained.
  • the melting in step (1) is performed at a temperature of 1400-1600 °C, which can be, for example, 1400 °C, 1450 °C, 1500 °C, 1550 °C or 1600 °C; however, the temperature is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the melting in step (1) is performed for a period of 50-70 min, which can be, for example, 50 min, 55 min, 60 min, 65 min or 70 min; however, the period is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the melting in step (1) is performed in an argon atmosphere.
  • the step of grinding in step (2) is: the alloy sheet obtained in step (1) is subjected to mechanical crushing and jet-mill grinding to obtain powder particles.
  • an average particle size of the powder particles is 50-100 ⁇ m, which can be, for example, 50 ⁇ m, 60 ⁇ m, 70 ⁇ m, 80 ⁇ m, 90 ⁇ m or 100 ⁇ m; however, the average particle size is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the jet-mill grinding is performed in an argon atmosphere.
  • the nitriding in step (2) comprises a first heat treatment and a second heat treatment which are performed in sequence.
  • the first heat treatment is: under an ammonia atmosphere, a temperature is raised to 500-550 °C, and held for 4-10 h.
  • the temperature is raised to 500-550 °C, which can be, for example, 500 °C, 510 °C, 520 °C, 530 °C, 540 °C or 550 °C; however, the temperature is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the temperature is held for a period of 4-10 h, which can be, for example, 4 h, 5 h, 6 h, 7 h, 8 h, 9 h or 10 h; however, the period is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the powder particles obtained by the grinding can be nitrided.
  • the value of ⁇ is greatly affected by the heating temperature and the temperature holding period, and the value of ⁇ is increased with the increase of the heating temperature and the temperature holding period.
  • the value of the ⁇ can be kept within the range of 2.9-4.0, and the samarium-based rare-earth permanent magnet material has good magnetic properties.
  • the second heat treatment is: under an argon atmosphere, a temperature is reduced to 400-450 °C, and held for 50-70 min.
  • the temperature is reduced to 400-450 °C, which can be, for example, 400°C, 410 °C, 420 °C, 430 °C, 440 °C or 450 °C; however, the temperature is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the second heat treatment has a temperature holding period of 50-70 min, which can be, for example, 50 min, 55 min, 60 min, 65 min or 70 min; however, the period is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the powder particles are subjected to the first heat treatment and the second heat treatment in sequence, and then cooled to room temperature under an argon atmosphere.
  • the ball-milling in step (2) is performed in an argon atmosphere.
  • an average particle size of the alloy powder in step (2) is 2-4 ⁇ m, which can be, for example, 2 ⁇ m, 2.5 ⁇ m, 3 ⁇ m, 3.5 ⁇ m or 4 ⁇ m; however, the average particle size is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the average particle size of the alloy powder is controlled at 2-4 ⁇ m, and the prepared samarium-based rare-earth permanent magnet material has better overall magnetic performance.
  • the particle size is less than 2 ⁇ m, the coercivity of the material is increased, but the remanence is decreased greatly; when the particle size is more than 4 ⁇ m, the remanence of the material is increased slightly, but the coercivity is decreased significantly. Therefore, the particle size of the alloy powder is controlled within a reasonable range, which can promote remanence and coercivity to achieve a good balance, so that excellent overall magnetic performance is obtained.
  • the step of phosphating in step (3) is: phosphoric acid, a solvent and the alloy powder obtained in step (2) are mixed and heated until the solvent is evaporated off to obtain a phosphated alloy powder.
  • An object of the phosphating treatment in the present application is to form a phosphating film on the surface of the alloy powder, improving the oxidation resistance of the alloy powder effectively.
  • a mass of the phosphoric acid is 2.5-3.5wt% of a mass of the alloy powder in step (2), which can be, for example, 2.5wt%, 2.8wt%, 3.0wt%, 3.2wt% or 3.5wt%; however, the mass is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • a mass ratio of the solvent to the alloy powder in step (2) is (0.8-1.2): 1, which can be, for example, 0.8: 1, 0.9: 1, 1: 1, 1.1: 1 or 1.2: 1; however, the mass ratio is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the solvent comprises ethanol.
  • a final temperature of the heating is 78-82 °C, which can be, for example, 78 °C, 79 °C, 80 °C, 81 °C or 82 °C; however, the final temperature is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the phosphating in step (3) is performed in a nitrogen atmosphere.
  • a final temperature of the heat treatment in step (3) is 140-160 °C, which can be, for example, 140 °C, 145 °C, 150 °C, 155 °C or 160 °C; however, the final temperature is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the heat treatment in step (3) has a temperature holding period of 3.5-4.5 h, which can be, for example, 3.5 h, 3.8 h, 4 h, 4.2 h or 4.5 h; however, the period is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the heat treatment in step (3) is performed in an oxygen-containing atmosphere, and a protective gas of the oxygen-containing atmosphere is nitrogen.
  • a concentration of the oxygen is 50-100 ppm, which can be, for example, 50 ppm, 60 ppm, 70 ppm, 80 ppm, 90 ppm or 100 ppm; however, the concentration is not limited to the listed values, and other unlisted values within this numerical range are also applicable.
  • the phosphating film formed on the surface of the phosphated alloy powder can be cured; in addition, by providing a trace amount of oxygen environment, a small area of the surface of the phosphated alloy powder which is not completely covered by the phosphating film is slightly oxidized to form a thin oxide film, further improving the oxidation resistant of the material.
  • the preparation method comprises the following steps:
  • an example of the present application provides an application of the samarium-based rare-earth permanent magnet material according to the first aspect, and the samarium-based rare-earth permanent magnet material is used in the fields of small and special electrical machines, magnetic sensors or audio equipment.
  • the samarium-based rare-earth permanent magnet material provided in examples of the present application, by doping the vanadium element, copper element and molybdenum element and controlling an appropriate range of the atomic ratio, the samarium-based rare-earth permanent magnet material accordingly has excellent overall magnetic performance, wherein the remanence is up to 7180 Gs, the coercivity is 10350 Oe, and the magnetic energy product is up to 12.3 MGOe.
  • the oxidation resistant of the material can be effectively improved.
  • the heating temperature and duration of the nitriding process, and controlling the particle size of the ball-milling By adjusting the heating temperature and duration of the nitriding process, and controlling the particle size of the ball-milling, remanence and coercivity are promoted to achieve a good balance, so that excellent overall magnetic performance is obtained.
  • the preparation method provided by the present application has a simple process and a low cost, which is suitable for the fields of small and special electrical machines, magnetic sensors or audio equipment.
  • the samarium-based rare-earth permanent magnet material is obtained by the preparation method below, and the preparation method comprises the following steps:
  • the samarium-based rare-earth permanent magnet material is obtained by the preparation method below, and the preparation method comprises the following steps:
  • the samarium-based rare-earth permanent magnet material is obtained by the preparation method below, and the preparation method comprises the following steps:
  • the samarium-based rare-earth permanent magnet material is obtained by the preparation method below, and the preparation method comprises the following steps:
  • the samarium-based rare-earth permanent magnet material is obtained by adopting a preparation method below, and the preparation method comprises the following steps:
  • This example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 2.68, and in the preparation method for the samarium-based rare-earth permanent magnet material, the stages of heating and temperature holding are: under an ammonia atmosphere, the temperature is raised to 480 °C, and kept for 7 h. The rest is the same as in Example 1.
  • This example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 2.65, and in the preparation method for the samarium-based rare-earth permanent magnet material, the stages of heating and temperature holding are: under an ammonia atmosphere, the temperature is raised to 570 °C, and kept for 7 h. The rest is the same as in Example 1.
  • This example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 2.85, and in the preparation method for the samarium-based rare-earth permanent magnet material, the stages of heating and temperature holding are: under an ammonia atmosphere, the temperature is raised to 520 °C, and kept for 2 h. The rest is the same as in Example 1.
  • This example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 2.67, and in the preparation method for the samarium-based rare-earth permanent magnet material, the stages of heating and temperature holding are: under an ammonia atmosphere, the temperature is raised to 520 °C, and kept for 12 h. The rest is the same as in Example 1.
  • This example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 3.75, and in the preparation method for the samarium-based rare-earth permanent magnet material, an average particle size of the alloy powder is adjusted to 1 ⁇ m. The rest is the same as in Example 1.
  • This example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 3.75, and in the preparation method for the samarium-based rare-earth permanent magnet material, an average particle size of the alloy powder is adjusted to 5 ⁇ m. The rest is the same as in Example 1.
  • This example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 3.75, and in the preparation method for the samarium-based rare-earth permanent magnet material, an oxygen concentration of the mixed atmosphere is adjusted to 30 ppm. The rest is the same as in Example 1.
  • This example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 3.75, and in the preparation method for the samarium-based rare-earth permanent magnet material, an oxygen concentration of the mixed atmosphere is adjusted to 120 ppm. The rest is the same as in Example 1.
  • This comparative example provides a samarium-based rare-earth permanent magnet material, which differs from Example 1 in that for the samarium-based rare-earth permanent magnetic material, ⁇ is 3.65, and in the preparation method for the samarium-based rare-earth permanent magnet material, step (3) is not performed. The rest is the same as in Example 1.
  • the samarium-based rare-earth permanent magnet material provided by Examples 1-15 and Comparative Examples 1-3 is mixed with an epoxy resin binder according to a mass ratio of 9: 1, and then pressed into a cylinder of ⁇ 10 ⁇ 10 m under a magnetic field of 1.5 T, and the magnetic performance test is performed with a B-H tester, and the obtained results are shown in Table 1.
  • Example 1 Remanence (Gs) Coercivity (Oe) Magnetic energy product (MGOe)
  • Example 1 7180 10350 12.3
  • Example 2 7100 9950 11.8
  • Example 3 7130 10060 12.0
  • Example 4 7050 9980 11.7
  • Example 5 6750 9760 8.9
  • Example 6 6670 13010 8.7
  • Example 8 4150 4460 3.1
  • Example 9 4190 4540 3.3
  • Example 10 5100 6400 5.0
  • Example 11 3940 2920 2.92
  • Example 12 6700 14200 8.5
  • Example 13 5730 2130 4.7
  • Example 14 6870 8730 10.5
  • Example 15 7030 7640 11.1 Comparative Example 1 6320 6770 8.5
  • Comparative Example 2 6130 6250 7.9 Comparative Example 3 6750 6320 9.5
  • Example 1 It can be seen from the comparison of Example 1 and Examples 2-5 that by controlling the preparation process parameters such as the particle size of the ball-milling, the heating temperature and the temperature holing periodtemperature holding period within reasonable ranges, the remanence and coercivity both can be guaranteed to reach a good state.
  • Example 1 it can be seen from the comparison of Example 1 with Example 6 and Example 7 that by introducing the copper element, vanadium element and molybdenum element with a suitable atomic ratio, the samarium-based rare-earth permanent magnet material is endowed with good magnetic properties; it can be seen from the comparison of Example 1 and Examples 8-11 that the heating temperature and the temperature holding period have a great impact on the nitrogen content, when the heating temperature is too high or too low, or the temperature holding period is too long or too short, the samarium-based rare-earth permanent magnet material cannot have an appropriate nitrogen content, so that it is difficult to ensure the magnetic properties of the material; it can be seen from the comparison of Example 1 with Example 12 and Example 13 that if the particle size of ball-milling is too small, the coercivity of the magnetic powder is increased, but the remanence is decreased greatly, and if the particle size of ball-milling is too large, the remanence of the magnetic powder is increased slightly, but the coercivity is decreased significantly; it can be
  • Example 1 It can be seen from the comparison of Example 1 with Comparative Example 1 and Comparative Example 2 that the material using other doped elements has changed microstructure, and its overall magnetic performance is lower than the overall magnetic performance of the samarium-based rare-earth permanent magnet material provided in the present application; it can be seen from the comparison of Example 1 and Comparative Example 3 that the alloy powder without phosphating and heat treatment has poor oxidation resistance, which further deteriorates the overall magnetic performance of the material.
  • the samarium-based rare-earth permanent magnet material provided by the present application is endowed with excellent overall magnetic performance, wherein the remanence is up to 7180 Gs, the coercivity is 10350 Oe, and the magnetic energy product is up to 12.3 MGOe.
  • the oxidation resistant of the samarium-based rare-earth permanent magnet material can be effectively improved.
  • the preparation method provided by the present application has a simple process and a low cost, which is suitable for the fields of small and special electrical machines, magnetic sensors or audio equipment.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hard Magnetic Materials (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Powder Metallurgy (AREA)
EP23826088.9A 2022-06-20 2023-05-30 Samarium-basiertes seltenerd-permanentmagnetmaterial und herstellungsverfahren dafür und anwendung davon Pending EP4379755A1 (de)

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US20020043301A1 (en) * 2000-02-22 2002-04-18 Marlin Walmer Density enhanced, DMC, bonded permanent magnets
CN105355354B (zh) 2015-12-15 2017-12-08 北京科技大学 一种钐铁氮基各向异性稀土永磁粉及其制备方法
CN105513733B (zh) * 2016-01-14 2017-10-03 赣州富尔特电子股份有限公司 一种烧结型钕铁硼永磁材料的制备方法
CN108994311A (zh) 2018-08-02 2018-12-14 兰州大学 一种固体盐喷雾造粒及还原扩散法制备各向异性高性能钐铁氮永磁合金粉末的方法
CN109273182B (zh) * 2018-10-19 2020-06-16 广东省稀有金属研究所 一种单晶磁粉及其制备方法与应用
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