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High-performance SmFe12-based permanent magnet powder and preparation method thereof

A permanent magnetic powder, high-performance technology, applied in the direction of magnetic objects, magnetic materials, metal processing equipment, etc., can solve the problems of difficult to guarantee the quality of powder, difficult to prepare high-quality powder, difficult to prepare coercive force, etc.

Active Publication Date: 2022-03-01
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Magnetron sputtering has always been a highly respected method, but its preparation products are only in the form of thin films, and are only in the experimental research stage, which cannot meet the needs of the current bulk magnetic material market
The melt rapid quenching method is also used to prepare SmFe12-based permanent magnet thin strips, but it is mainly to study the influence of added elements on the material properties. To prepare bulk materials, powder making and block forming operations are still required, while block The choice of preparation process in the molding process also caused a significant drop in magnetic properties
ThM 12 The phase will decompose at a temperature higher than 500 ° C, which limits the application of the preparation method involving high temperature heat treatment
Hydrogenation disproportionation method produces powder with large particle size and unevenness, making it difficult to prepare dense bulk magnets with high coercive force
[0003] In the prior art, although some have improved the preparation process, for example, the patent of publication number CN201911181353.5 adopts the process of smelting-quick-setting thin strip-heat treatment-powdering-nitriding to prepare samarium-iron-nitrogen magnetic powder, but the process is complicated and the powder It is difficult to guarantee the quality of the body, and it is difficult to prepare high-quality powder that meets the requirements of 3D printing

Method used

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  • High-performance SmFe12-based permanent magnet powder and preparation method thereof
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  • High-performance SmFe12-based permanent magnet powder and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] Divide provisioning into (Sm 0.8 Zr 0.2 )(Fe 0.8 co 0.2 ) 10.6 Cu 0.4 Alloys of Ti (adding elements of Zr, Co, Cu and Ti to SmFe 12 alloy) into an induction furnace for high-pressure induction melting for 15s, and then for homogenization annealing at a temperature of 1100°C for 24h. The homogenized annealed alloy ingot is subjected to high-pressure gas atomization pulverization treatment, the pressure of the atomization chamber is 0.3MPa, and the gas in the chamber is high-purity N 2 , the spray casting pressure is 0.5MPa, the atomizing gas is high-purity Ar, and the atomizing gas pressure is 2.0MPa, and high-performance SmFe 12 base permanent magnet powder.

[0034] The high-performance SmFe of this embodiment 12 The XRD spectrum of the base permanent magnet powder is shown in figure 1 , the morphology of the atomized powder is shown in figure 2 , the surface topography of a single atomized powder is shown in image 3 , microscopic BSED diagram see Figure...

Embodiment 2

[0036] Divide provisioning into (Sm 0.8 Zr 0.2 )(Fe 0.8 co 0.2 ) 10.5 Cu 0.5 Alloys of Ti (adding elements of Zr, Co, Cu and Ti to SmFe 12 alloy) into an induction furnace for high-pressure induction melting for 15s, and then for homogenization annealing at a temperature of 1100°C for 24h. The homogenized annealed alloy ingot is subjected to high-pressure gas atomization pulverization treatment, the pressure of the atomization chamber is 0.5MPa, and the gas in the chamber is high-purity N 2 , the spray casting pressure is 0.7MPa, the atomizing gas is high-purity Ar, and the atomizing gas pressure is 2.5MPa, and high-performance SmFe 12 base permanent magnet powder.

Embodiment 3

[0038] Divide provisioning into (Sm 0.7 Zr 0.3 )(Fe 0.8 co 0.2 ) 10.6 Cu 0.4 Alloys of Ti (adding elements of Zr, Co, Cu and Ti to SmFe 12 alloy) into an induction furnace for high-pressure induction melting for 15s, and then for homogenization annealing at a temperature of 1100°C for 24h. The homogenized annealed alloy ingot is subjected to high-pressure gas atomization pulverization treatment, the pressure of the atomization chamber is 0.7MPa, and the gas in the chamber is high-purity N 2 , the spray casting pressure is 0.9MPa, the atomizing gas is high-purity Ar, and the atomizing gas pressure is 2.8MPa, and high-performance SmFe 12 base permanent magnet powder.

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Abstract

The invention discloses high-performance SmFe12-based permanent magnet powder and a preparation method thereof, and belongs to the technical field of rare earth permanent magnet preparation, the components of the high-performance SmFe12-based permanent magnet powder are (Sm, Zrx) (Fe0. 8Co0. 2) 11-yCuyTi, x is 0.2-0.3, and y is 0.4-0.5, the preparation method comprises the following steps: Zr, Co, Cu and Ti are added into SmFe12 alloy, alloying treatment is carried out, the (Sm, Zrx) (Fe0. 8Co0. 2) 11-yCuyTi alloy with a uniform component structure is obtained, and the Sm, Zrx) (Fe0. 8Co0. 2) 11-yCuyTi alloy with the uniform component structure is prepared. The high-performance SmFe12-based permanent magnet powder prepared by the preparation method disclosed by the invention is proper in grain size and organization structure, and the final magnetic performance of a formed block body is favorably improved.

Description

technical field [0001] The invention relates to the technical field of rare earth permanent magnet preparation, in particular to a high-performance SmFe 12 Base permanent magnet powder and its preparation method. Background technique [0002] With ThMn 12 RFe 12 Intermetallic compounds have long been of interest in research to produce high-performance permanent magnets. RFe 12 The crystal structure of the compound belongs to the tetragonal space group I4 / mmm. Due to the binary RFe 12 The compound is metastable, and it is difficult to form the RFe12 phase. Some scholars have used the first-principle theoretical calculation and analysis combined with experimental research to improve its stability by using interstitial atom substitution, and through a small amount of added elements (such as T=Cr, Mo, V, Ti, Co, Ga) replace Fe atoms to form R(Fe, T) 12 compound, thereby increasing the stability of the 1:12 phase. where Sm(Fe,Ti) 12 The compound has easy c-axis anisotrop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F1/065B22F9/08C22C38/14C22C38/10C22C38/16H01F1/055B33Y70/00
CPCB22F9/082C22C38/005C22C38/14C22C38/10C22C38/16H01F1/0551B33Y70/00Y02P10/25
Inventor 柳昆张鹏杰张一昆冯运莉王书桓
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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