Rare earth permanent magnetic material and preparation method thereof

A rare earth permanent magnet and raw material technology, which is applied in the direction of magnetic materials, inorganic materials, magnetic objects, etc., can solve the problem that permanent magnet materials cannot obtain high coercive force at the same time, low usage of dysprosium and/or terbium, dysprosium and/or or high terbium usage to achieve high coercive force, low temperature coefficient and high working temperature

Active Publication Date: 2014-07-02
BYD CO LTD
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to solve the technical problems that the permanent magnet materials in the prior art cannot obtain higher coercive force, lower temperature coefficient and higher working temperature at the same time, and the usage of dysprosium and / or terbium is relatively high, Provide a rare earth permanent magnet material with higher coercive force, lower temperature coefficient and higher working temperature, and lower usage of dysprosium and / or terbium, as well as the preparation method of the rare earth permanent magnet material and the method The prepared rare earth permanent magnet material

Method used

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  • Rare earth permanent magnetic material and preparation method thereof
  • Rare earth permanent magnetic material and preparation method thereof
  • Rare earth permanent magnetic material and preparation method thereof

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preparation example Construction

[0019] The invention provides a method for preparing a rare earth permanent magnet material. The method includes sequentially mixing and molding, sintering and tempering the main phase alloy raw material and the auxiliary phase alloy raw material, wherein the composition of the main phase alloy raw material is: R1 x R2 y Fe 100-x-y-z-u co z B u, R1 is selected from Pr and / or Nd; R2 is selected from Dy and / or Tb, wherein, x, y, z, u are mass percentages, and 26%≤x+y≤36%, 0.01%≤y≤6% , 0%≤z≤5%, 0.8%≤u≤1.2%; the composition of the auxiliary phase alloy raw material is: R1 a R2 b Fe 100-a-b-c-n-v co c B n m v , R1 is selected from Pr and / or Nd; R2 is selected from Dy and / or Tb, M is selected from one of Zr, Ga, Cu, Nb, Sn, Mo, Al, V, W, Si, Hf, Ti or Several types, where a, b, c, n, v are mass percentages, and 35%≤a+b≤80%, 5%≤b≤40%, 0%≤c≤40%, 0%≤n≤ 1.2%, 0%≤v≤30%; relative to the total amount of 100 parts by weight of the main phase alloy raw material and the auxiliary ph...

Embodiment 1

[0043] Put the recipe as Pr 5 Nd 23 Dy 3 Tb 0.5 Fe 66.5 co 1 B 1 The raw material is strip-spun at a copper roller surface speed of 1.8m / s to prepare a strip-strip sheet, which is used as the main phase alloy raw material. The main phase alloy raw material was absorbed hydrogen at 15° C. for 2 hours under a hydrogen pressure of 0.15 MPa, and then dehydrogenated at 560° C. for 6 hours, thereby obtaining hydrogen crushed powder of the main phase alloy raw material. Then, mix 100 parts by weight of hydrogen crushed powder of the main phase alloy raw material with 0.05 parts by weight of NdFeB special antioxidant (purchased from Beijing Juncefeng Technology Development Co., Ltd., brand KM-01), and then pass The jet mill grinds to make the main phase alloy raw material fine powder with an average particle diameter of 3.2um, then mix the obtained main phase alloy raw material fine powder with 0.03 parts by weight of gasoline based on the main phase alloy raw material fine powd...

Embodiment 2

[0049] Adopting the preparation method of the rare earth permanent magnet material of embodiment 1, the difference is that relative to the total amount of the main phase precursor and the auxiliary phase precursor of 100 parts by weight, the consumption of the auxiliary phase precursor is 3.5 parts by weight. The magnetic properties of the rare earth permanent magnet material are shown in Table 1.

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Abstract

The invention discloses a rare earth permanent magnetic material which comprises a main phase and an auxiliary phase. The rare earth permanent magnetic material is characterized in that the main phase constitutes R1xR2yFe100-x-y-z-uCozBu, the auxiliary phase constitutes R1aR2bFe100-a-b-c-n-vCocBnMv, total mass of the main phase and the auxiliary phase serves as a reference, and the mass content of the auxiliary phase is larger than 0 and smaller than or equal to 20%. The invention further provides a preparation method of the rare earth permanent magnetic material and the rare earth permanent magnetic material prepared in the method. The rare earth permanent magnetic material has high coercivity and a low temperature coefficient under the condition that loss of residual magnetism is little, effectively raises work temperature, obviously reduces content of arrowhead and / or terbium and reduces production cost of the permanent magnetic material.

Description

technical field [0001] The invention relates to a rare earth permanent magnet material, a preparation method of the rare earth permanent magnet material, and a rare earth permanent magnet material prepared by the method. Background technique [0002] Compared with other types of permanent magnet materials, sintered NdFeB permanent magnet materials have outstanding advantages such as high magnetic performance and low price, which makes its development and application have achieved extraordinary development. At present, its comprehensive magnetic properties have reached a high level, and its application has involved various fields of the national economy. [0003] However, new energy and environmental protection are increasingly concerned and become an inevitable development trend, and the requirements for high coercive force and high remanence are also put forward for the permanent magnet materials used. High-coercivity magnets require more expensive dysprosium and / or terbiu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/053H01F1/08B22F3/16
Inventor 张法亮邓小霞宫清
Owner BYD CO LTD
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