WO2024048973A1 - Procédé de fabrication d'un aimant permanent à base de fe et aimant permanent à base de fe ainsi fabriqué - Google Patents

Procédé de fabrication d'un aimant permanent à base de fe et aimant permanent à base de fe ainsi fabriqué Download PDF

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WO2024048973A1
WO2024048973A1 PCT/KR2023/009673 KR2023009673W WO2024048973A1 WO 2024048973 A1 WO2024048973 A1 WO 2024048973A1 KR 2023009673 W KR2023009673 W KR 2023009673W WO 2024048973 A1 WO2024048973 A1 WO 2024048973A1
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permanent magnet
manufacturing
based permanent
bulk
magnetic
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PCT/KR2023/009673
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English (en)
Korean (ko)
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박지훈
최철진
주천홍
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한국재료연구원
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Publication of WO2024048973A1 publication Critical patent/WO2024048973A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
    • H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
    • H01F41/0253—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets for manufacturing permanent magnets
    • 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
    • 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
    • H01F1/0576—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 pressed, e.g. hot working
    • 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
    • H01F1/12—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 soft-magnetic materials
    • H01F1/14—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 soft-magnetic materials metals or alloys
    • H01F1/147—Alloys characterised by their composition
    • 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

Definitions

  • the present invention relates to a method for manufacturing Fe-based permanent magnets and Fe-based permanent magnets manufactured therefrom. Specifically, it relates to a method for manufacturing Fe-based permanent magnets with excellent magnetic properties by controlling the temperature range and composition of the Fe-based permanent magnet during sintering of high-density bulk containing magnetic powder, and the Fe-based permanent magnet manufactured therefrom.
  • rare earth-iron-based magnetic materials with a ThMn 12 type crystal structure have performance exceeding that of Nd-Fe-B magnets, and much research is being conducted on this.
  • a magnetic material having a ThMn 12 type crystal structure containing Sm as a rare earth element has been proposed.
  • rare earth magnets with excellent magnetic properties such as coercive force and remanent magnetization.
  • the present inventor completed the present invention by confirming that when a high-density bulk containing magnetic powder is sintered and heat-treated at a specific temperature range to produce an Fe-based permanent magnet with a specific composition range, it has excellent magnetic properties.
  • the technical problem to be achieved by the present invention is to provide a Fe-based permanent magnet with excellent magnetic properties and a method for manufacturing the same.
  • a method for manufacturing a Fe-based permanent magnet comprising the step of sintering the high-density bulk at a temperature of 750 ° C. to 850 ° C., wherein the Fe-based permanent magnet has the chemical formula Sm (Fe 0.8 Co 0.2 ) 12-ab Ti
  • a method for manufacturing a Fe-based permanent magnet is provided, which has a composition of a V b , and in the above formula, a+b is 1.2 or more and 1.6 or less, a is 0.5 or more and less than 1.6, and b is more than 0 and 1.1 or less.
  • an Fe-based permanent magnet manufactured by the above method and having a ThMn 12 type crystal structure is provided.
  • the method for manufacturing an Fe-based permanent magnet according to an embodiment of the present invention can provide an Fe-based permanent magnet with excellent magnetic properties.
  • the Fe-based permanent magnet according to an embodiment of the present invention may have excellent magnetic properties such as maximum magnetic energy product (BH max ).
  • BH max maximum magnetic energy product
  • the unit “part by weight” may refer to the ratio of weight between each component.
  • a and/or B means “A and B, or A or B.”
  • manufacturing an ingot by melting a magnetic raw material containing Sm, Fe, Co, Ti, and V; Manufacturing the ingot into a ribbon by melt spinning; Grinding the ribbon to produce magnetic powder; Pressing the magnetic powder to produce a high-density bulk; and sintering the high-density bulk at a temperature of 750° C. to 850° C. to produce a bulk magnetic material, wherein the Fe-based permanent magnet has the chemical formula Sm(Fe 0.8 Co 0.2 ) 12-ab.
  • a method for manufacturing a Fe-based permanent magnet which has a composition of Ti a V b , and in the above formula, a+b is 1.2 or more and 1.6 or less, a is 0.5 or more but less than 1.6, and b is more than 0 and less than 1.1.
  • the method for manufacturing Fe-based permanent magnets according to an embodiment of the present invention can provide Fe-based permanent magnets with excellent magnetic properties through a simple process.
  • an ingot is first manufactured by melting the raw material powder.
  • the raw material powder may be a raw material for magnetic commercial use or a raw material for non-magnetic commercial use, and may contain each elemental material prepared to suit the composition of the Fe-based permanent magnet to be manufactured.
  • the shape of the raw material is not particularly limited, but for example, it may be in the form of a piece, that is, a chip, or it may be in the form of a powder.
  • the shape of the elemental material is in the form of a powder, the powders of each elemental material may be uniformly mixed and then melted.
  • the raw materials containing Sm, Fe, Co, Ti, and V may include magnetic phase raw materials such as Sm material, Fe material, Co material, Ti material, and V material.
  • the raw material may include each element material to have a composition of the chemical formula Sm c (Fe 0.8 Co 0.2 ) 12-ab Ti a V b .
  • a+b is 1.2 or more and 1.6 or less
  • a is 0.5 or more and less than 1.6
  • b is more than 0 and 1.1 or less
  • c is 1.3 to 1.7.
  • a+b may be 1.2 or more and 1.6 or less
  • a may be 0.6 or more and less than 0.8
  • b may be 0.6 or more and 0.8 or less
  • c may be 1.4 to 1.6.
  • Fe-based permanent magnets manufactured from raw materials of the above composition may have excellent magnetic properties due to a high maximum magnetic energy product.
  • the composition of the raw materials and the crystal grain composition of the manufactured Fe-based permanent magnet may be different.
  • the Sm composition of the raw material and the crystal grain Sm composition of the manufactured Fe-based permanent magnet may be different.
  • Sm it can be used as a raw material for the magnetic phase in the manufacturing process of Fe-based permanent magnets, but in the final manufactured Fe-based permanent magnet, the Sm is included not only in the magnetic phase of the crystal grains but also in the non-magnetic phase of the grain boundaries, or Since some of the Sm may be vaporized, the amount of Sm added may be dispersed into crystal grains and grain boundary phases, so the Sm composition of the raw material and the crystal grain Sm composition of the manufactured Fe-based permanent magnet may be different.
  • an ingot can be manufactured by melting the raw materials together.
  • the melting method is not particularly limited, but the melting may be performed by a plasma arc melting method.
  • the melting may be performed by putting raw materials into a crucible of a plasma arc melting device and heating them in an argon atmosphere.
  • the melting may be carried out by melting the ingot once with an arc at a temperature of 2000 K to 2500 K, then turning the ingot over, melting it once more, and repeating the process two to five times.
  • the temperature and time for performing the melting can be adjusted to conditions in which all elemental materials can be melted depending on the type and content of the elements contained in the raw material.
  • the melting may be performed in an inert gas atmosphere.
  • the melting may be performed in an argon atmosphere.
  • Melting is a process of turning metal and non-metallic elements into a fluid at a very high temperature, so it may be performed in an inert gas atmosphere to prevent undesired side reactions.
  • an ingot can be manufactured through the melting and then cooling process. Specifically, the cooling may be performed rapidly. When the melt is rapidly cooled, a single magnetic phase can be obtained.
  • the ingot is then manufactured into a ribbon by melt spinning.
  • the melt spinning process is a process that allows the ingot to be remelted and cooled rapidly, and the alloy is formed without sufficient time for separate crystal grains to grow inside the alloy, resulting in amorphous or nanocrystalline results.
  • the melt spinning process may be performed at a rotation speed of 30 to 50 m/s or 30 to 40 m/s.
  • a ribbon having nanocrystals can be manufactured by rapid cooling, and as a result, the ribbon can be pulverized to form an amorphous powder, a magnetic phase alloy powder.
  • the melt spinning process may be performed at a temperature of 1500 K to 2000 K.
  • the melt spinning operation temperature can be adjusted by considering the composition of the magnetic and non-magnetic raw materials.
  • the ribbon is pulverized to produce magnetic powder.
  • processability can be improved by manufacturing it into a bulk magnet.
  • the grinding method is not particularly limited, and for example, it can be physically pulverized using an agate mortar, and it can also be processed into a magnetic powder form using a milling device.
  • the average particle diameter of the magnetic powder may be about 1 ⁇ m to 50 ⁇ m, and this may be adjusted in consideration of the characteristics of the process of manufacturing the bulk magnetic material to be carried out later.
  • the step of pressurizing the magnetic powder to produce a high-density bulk includes manufacturing a molded body by applying a pressure of 2 t to 10 t to the magnetic powder; and manufacturing a high-density bulk by applying a pressure of 50 t to 200 t to the molded body. Additionally, the pressure applied when manufacturing the molded body and high-density bulk may be adjusted in consideration of the characteristics of the process for manufacturing the bulk magnetic material that will be carried out later.
  • a bulk magnetic material can be manufactured by sintering the high-density bulk.
  • the bulk magnetic material can be manufactured by sintering the high-density bulk at a temperature of 750 °C to 850 °C, 750 °C to 825 °C, 775 °C to 800 °C, or 775 °C to 850 °C.
  • the bulk magnetic material can be manufactured by sintering the high-density bulk at a temperature of 775°C to 825°C.
  • the Fe-based permanent magnet having the composition of the present invention manufactured by sintering in the above temperature range may have excellent magnetic properties due to its high maximum magnetic energy product.
  • the step of manufacturing the bulk magnetic material by sintering the high-density bulk at a temperature of 750 ° C. to 850 ° C. may be performed for 10 minutes to 120 minutes.
  • the Fe-based permanent magnet having the composition of the present invention manufactured by sintering in the above time range may have excellent magnetic properties due to its high maximum magnetic energy product.
  • the step of manufacturing the bulk magnetic material by sintering the high-density bulk at a temperature of 750 °C to 850 °C may be performed in a high vacuum of 10 -6 to 10 -5 Torr.
  • a high vacuum 10 -6 to 10 -5 Torr.
  • the Fe-based permanent magnet having the composition of the present invention manufactured by sintering in high vacuum may have excellent magnetic properties due to its high maximum magnetic energy product.
  • Manufacturing the Fe-based permanent magnet may be a method of manufacturing a bulk magnetic material using the high-density bulk through a discharge plasma sintering process.
  • the discharge plasma sintering is a method that applies pulsed current to high-density bulk sintering, and has the characteristic of being able to be performed quickly.
  • the discharge plasma sintering may be performed at a temperature of 750 to 850° C. for 10 to 60 minutes.
  • the step of rapidly cooling the bulk magnetic material may be further included.
  • the cooling may be water quenching or rapid cooling.
  • water with high specific heat serves as a refrigerant and rapidly removes heat from the bulk magnetic material manufactured through a high-temperature process, making rapid cooling possible.
  • manufacturing an ingot by melting a magnetic raw material containing Sm, Fe, Co, Ti, and V; Manufacturing the ingot into a ribbon by melt spinning; Grinding the ribbon to produce magnetic powder; Pressing the magnetic powder to produce a high-density bulk; and sintering the high-density bulk at a temperature of 750° C. to 850° C. to produce a bulk magnetic material.
  • It provides an Fe-based permanent magnet manufactured by a method of manufacturing a Fe-based permanent magnet including a step.
  • the Fe-based permanent magnet has a composition of the chemical formula Sm(Fe 0.8 Co 0.2 ) 12-ab Ti a V b and may have a ThMn 12 type crystal structure.
  • a+b is 1.2 or more and 1.6 or less, a is 0.5 or more but less than 1.6, and b is more than 0 and 1.1 or less.
  • a+b may be 1.2 or more and 1.6 or less, a may be 0.6 or more and less than 0.8, and b may be 0.6 or more and 0.8 or less.
  • the Fe-based permanent magnet having a composition of Sm(Fe 0.8 Co 0.2 ) 12-ab Ti a V b manufactured by sintering the high-density bulk at a temperature of 750°C to 850°C has a high maximum magnetic energy product and has excellent magnetic properties. You can.
  • the manufactured Fe-based permanent magnet may not be the crystal structure of type ThMn 12 . It was confirmed that the Fe-based permanent magnet with a composition of Sm (Fe 0.8 Co 0.2 ) 11 Ti 0.5 V 0.5 does not have a ThMn 12 type crystal structure as a result of XRD Patterns and Lattice and Phase Concentration evaluation. did.
  • the Fe-based permanent magnet manufactured by the method for manufacturing the Fe-based permanent magnet has a magnetic field of 3.9 MGOe or more, 4.3 MGOe or more, 3.9 MGOe to 30 MGOe, 4.3 MGOe to 20 MGOe, or 4.5 MGOe to 15 MGOe. It may have a maximum magnetic energy product of , and preferably may have a maximum magnetic energy product of 4.5 MGOe or more.
  • Metal powder materials with the purity and particle size shown in Table 1 below were used as raw materials, and those purchased from Taewon Science were used as is.
  • the raw materials were placed in a water-cooled copper crucible of an argon plasma arc melting device (LEYBOLD, LK6/45), and then heated and melted at a temperature of about 2273 K for 30 minutes under an argon atmosphere. At this time, pieces of each element were added to the magnetic raw materials to have a composition of Sm 1.5 (Fe 0.8 Co 0.2 ) 10.8 Ti 0.6 V 0.6 .
  • an alloy ribbon with a width of 1 mm was obtained by melt spinning at a rotation speed of 37 m/s at a temperature of about 1873 K using a melt spinning device (YNI Tech).
  • the alloy ribbon was pulverized using an agate mortar to obtain alloy powder for magnetic phase with an average particle diameter of 25 ⁇ m. After putting it into a mold, a pressure of 5 t was applied at room temperature to obtain a molded body.
  • the molded body was made into a high-density bulk by applying a pressure of 100 t at room temperature. In order to sinter the high-density bulk, it is heat-treated for 15 minutes at a temperature of 750° C. and high vacuum conditions of 10 -6 to 10 -5 Torr and then quenched to obtain a composition of Sm (Fe 0.8 Co 0.2 ) 10.8 Ti 0.6 V 0.6 .
  • Example 1-1 A Fe-based permanent magnet was manufactured.
  • Example 1-1 The manufacturing method was the same as in Example 1-1 except that the composition of the Fe-based permanent magnet shown in Tables 2 and 3 below and the temperature conditions for heat treatment during sintering of the high-density bulk containing magnetic alloy powder were adjusted. Fe-based permanent magnets of Examples 1-2 to 3-5 and Comparative Examples 1-1 to 5-8 were manufactured using this method.
  • Example 1-1 Sm(Fe 0.8 Co 0.2 ) 10.8 Ti 0.6 V 0.6 750
  • Example 1-2 Sm(Fe 0.8 Co 0.2 ) 10.8 Ti 0.6 V 0.6 775
  • Example 1-3 Sm(Fe 0.8 Co 0.2 ) 10.8 Ti 0.6 V 0.6 800
  • Example 1-4 Sm(Fe 0.8 Co 0.2 ) 10.8 Ti 0.6 V 0.6 825
  • Example 1-5 Sm(Fe 0.8 Co 0.2 ) 10.8 Ti 0.6 V 0.6 850
  • Example 2-1 Sm(Fe 0.8 Co 0.2 ) 10.6 Ti 0.7 V 0.7 750
  • Example 2-2 Sm(Fe 0.8 Co 0.2 ) 10.6 Ti 0.7 V 0.7 775
  • Example 2-3 Sm(Fe 0.8 Co 0.2 ) 10.6 Ti 0.7 V 0.7 800
  • Example 2-4 Sm(Fe 0.8 Co 0.2 ) 10.6 Ti 0.7 V 0.7 825
  • Example 2-5 Sm(Fe 0.8 Co 0.2
  • the magnetic properties of the Fe-based permanent magnets according to Examples 1-1 to 3-5 and Comparative Examples 1-1 to 5-8 were evaluated.
  • the magnetic properties are obtained after measuring the magnetic hysteresis curve of a Fe-based permanent magnet using a vibrating sample magnetometer (VSM) equipment (MicroSense, USA).
  • VSM vibrating sample magnetometer
  • the magnetic field applied to the sample of Fe-based permanent magnet was up to 2.5 Tesla, and the magnitude of the magnetic field was changed, and the signal coming from the sample was measured with the pick-up coils mounted on the electromagnet of the VSM to obtain a magnetic hysteresis curve.
  • the resulting maximum magnetic energy product is shown in Table 4 below.
  • Examples 2-1 to 1-3 in Table 4 above Referring to Example 2-5 and Comparative Examples 2-1 to 2-3, in the method for manufacturing a Fe-based permanent magnet with a composition of Sm (Fe 0.8 Co 0.2 ) 10.6 Ti 0.7 V 0.7 , the heat treatment temperature during sintering is 750 °C (Example 2-1), 775 °C (Example 2-2), 800 °C (Example 2-3), 825 °C (Example 2-4) and 850 °C (Example 2-5) It can be confirmed that it is superior to Comparative Examples 2-1 to 2-3, which were cases where the maximum magnetic energy product was outside the above temperature.
  • Comparative Examples 4-1 to 4-7 in Table 4 in the method for manufacturing a Fe-based permanent magnet with a composition of Sm (Fe 0.8 Co 0.2 ) 10.2 Ti 0.9 V 0.9 , the heat treatment temperature during sintering is 750 ° C. (Comparative Example 4-3), Comparative Example 4-1, Comparative Example 4-2 where the maximum magnetic energy product exceeds the above temperature in the case of 800 °C (Comparative Example 4-4) and 850 °C (Comparative Example 4-5) , it can be confirmed that it is similar to or lower than Comparative Example 4-6 and Comparative Example 4-7.
  • Comparative Examples 5-1 to 5-8 in Table 4 in the method for manufacturing a Fe-based permanent magnet with a composition of Sm (Fe 0.8 Co 0.2 ) 10 Ti 1 V 1 , the heat treatment temperature during sintering is 750 ° C. Example 5-2), 765°C (Comparative Example 5-3), 780°C (Comparative Example 5-4), 800°C (Comparative Example 5-5), and 850°C (Comparative Example 5-6). It can be seen that there is no significant difference from Comparative Examples 5-1, Comparative Examples 5-7, and Comparative Examples 5-8, which are cases where the temperature exceeds the above temperature.
  • the heat treatment temperature during sintering is greater than 850 °C, such as 900 °C (Comparative Example 1-2), 1000 °C (Comparative Example 1-3), 900 °C (Comparative Example 2-2), 1000°C (Comparative Example 2-3), 900°C (Comparative Example 3-2), 1000°C (Comparative Example 3-3), 900°C (Comparative Example 4-6), 1000°C (Comparative Example 4-7), It can be seen that the maximum magnetic energy product is very low at 900°C (Comparative Example 5-7) and 1000°C (Comparative Example 5-8).
  • the magnetic properties such as maximum magnetic energy product of the Fe-based permanent magnet manufactured in the composition range and sintering heat treatment temperature range of the Fe-based permanent magnet according to the present invention can be improved.

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Abstract

La présente invention concerne un procédé de fabrication d'un aimant permanent à base de Fe, et un aimant permanent à base de Fe ainsi fabriqué. Spécifiquement, la présente invention concerne : un procédé de fabrication d'un aimant permanent à base de Fe ayant d'excellentes propriétés magnétiques par contrôle d'une plage de température et d'une composition d'aimant permanent à base de Fe pendant un frittage de poudre magnétique ; et un aimant permanent à base de Fe ainsi fabriqué.
PCT/KR2023/009673 2022-08-31 2023-07-07 Procédé de fabrication d'un aimant permanent à base de fe et aimant permanent à base de fe ainsi fabriqué WO2024048973A1 (fr)

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KR10-2022-0109618 2022-08-31
KR1020220109618A KR20240030497A (ko) 2022-08-31 2022-08-31 Fe계 영구자석의 제조방법 및 이로부터 제조된 Fe계 영구자석

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KR20180062157A (ko) * 2016-11-30 2018-06-08 현대자동차주식회사 Fe-Mn-Bi계 자성체, 이의 제조방법, Fe-Mn-Bi계 소결자석 및 이의 제조방법
KR20200065958A (ko) * 2018-11-30 2020-06-09 한국기계연구원 ThMn12형 자성체 및 그 제조방법
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KR20220115773A (ko) * 2021-02-08 2022-08-18 한국재료연구원 이방성 희토류 벌크자석의 제조방법 및 이로부터 제조된 이방성 희토류 벌크자석

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20180062157A (ko) * 2016-11-30 2018-06-08 현대자동차주식회사 Fe-Mn-Bi계 자성체, 이의 제조방법, Fe-Mn-Bi계 소결자석 및 이의 제조방법
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