Neodymium-iron-boron magnet material, raw material composition and preparation method and application thereof

Abstract

The invention discloses a neodymium-iron-boron magnet material, a raw material composition and a preparation method and application thereof. The raw material composition of the neodymium-iron-boron magnet material comprises a first component and a second component, wherein the first component includes light rare earth element LR which comprises Nd, 0 to 10 but not equal to 0 mass percent of Ho, 0.35 to 0.6 mass percent of Cu, 0 to 0.32 mass percent of C, 0 to 0.42 but not 0 mass percent of Ga, 0 to 0.5 mass percent of Co, 0 to 0.5 mass percent of Al, 0.05 to 0.5 mass percent of X, 0.9 to 1.05mass percent of B, and the balance of Fe; the first component does not include other heavy rare earth elements except Ho; and the second component includes 0.2-1 mass percent of Dy and/or Tb. The neodymium-iron-boron magnet material is good in grain boundary continuity, high in residual magnetism, high in coercive force, good in high-temperature performance and good in corrosion resistance.

Description

technical field [0001] The invention relates to a neodymium-iron-boron magnet material, a raw material composition, a preparation method and application thereof. Background technique [0002] Nd-Fe-B permanent magnet material is based on Nd2Fel4B compound, which has the advantages of high magnetic performance, small thermal expansion coefficient, easy processing and low price. Since its inception, it has grown at an average annual rate of 20-30%, becoming 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 which sintered magnets account for more than 80% of the total output and are the most widely used. [0003] With the continuous optimization of preparation process and magnet composition, the maximum energy product of sintered Nd-Fe-B magnet is close to the theoretical value. With the vigorous development of emerging industries such as wi...

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Problems solved by technology

[0005] The present invention improves the Curie temperature and corrosion resistance by adding Co in order to overcome the existing NdFeB magnets, and Co is likely to cause a sharp drop in coercive force and expensiv

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