A kind of mixed rare earth-iron-based permanent magnet material and its preparation method and application

Abstract

The invention provides mischmetal-iron-based permanent magnetic material, a preparation method for the same and an application of the same. The mischmetal-iron-based permanent magnetic material is prepared by rare earth extraction intermediate product. A principal phase of the mischmetal-iron-based permanent magnetic material has an R2Fe14B phase structure. The permanent magnetic material does notcontain C2Fe2 phase and a general chemical formula is MM2+xFe14-yBz, wherein R represents rare earth elements, MM represents mixed mischmetal, a range of x that x is more than or equal to 0.0 and less than or equal to 1.0; a range of y is that y is more than or equal to 0.0 and less than or equal to 3.0; and a range of z is that z is more than or equal to 1.0 and less than or equal to 1.3. The rare earth extraction intermediate product is mischmetal alloy extracted from light rare earth mine, the mischmetal alloy containing impurities and having a natural element proportion, during the rare earth extraction; an intrinsic coercive force of the permanent material Hcj is more than or equal to 4kOe, residual magnetism Br is more than or equal to 6kGs; and a maximum magnetic energy product (BH)max is more than or equal to 5MGOe. The mischmetal metal alloy having the natural element proportion and obtained during rare earth separation works as raw material, a simple melt quick-quenching technology is applied, and production cost is reduced; and comprehensive performance of the mischmetal-iron-based permanent magnetic material can be improved.

Description

technical field [0001] The invention belongs to the field of magnetic materials. Specifically, the invention relates to a mixed rare earth-iron-based permanent magnet material and its preparation method and application. Background technique [0002] In the early 1980s, researchers in Japan and the United States developed Nd-Fe-B ternary alloys, and used rapid quenching methods to prepare commercial magnetic powders, which became the third-generation rare earth permanent magnet materials. The permanent magnetic properties of this material mainly come from the chemical formula of Nd 2 Fe 14 Hard magnetic phase of B. Subsequent studies have found that the presence of a small amount of Nd-rich grain boundary phase, the addition of a small amount of Tb and Dy, and the refinement of grains can effectively improve the permanent magnetic properties of the magnet. Today, NdFeB is still the best permanent magnet material. [0003] With the development of information technology, a...

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Problems solved by technology

[0012] In addition, in the currently published patents, the preparation process of mixed rare earth-iron-based permanent magnet materials includes two kinds of rapid quenching annealing and sintering, but these two processes belong to the equilibrium or near-equilibrium phase formation process, which cannot effectively avoid CeFe 2 phase generation

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