A kind of high remanence, high coercive force r-t-b permanent magnet material and preparation method thereof

Abstract

A high-remanence and high-coercivity R-T-B permanent magnet material comprises a main phase alloy D, a nonmagnetic grain boundary phase G and an auxiliary alloy phase F. A magnet component is represented as D100-u-vGuFv by weight percentage and 0.1 <= u <= 2 wt%, 1 <= v <= 10 wt%. Compared with the prior art, the present invention has the advantage that the present invention adopts powder requiredfor adding a magnet according to the function and the adding manner thereof is simple and convenient, without changing the current production process, thereby realizing production of the high-coercivity and high-remanence material. Comparing the magnet of the present invention prepared with different functional powder like the main phase alloy D, the nonmagnetic grain boundary phase G and the auxiliary alloy phase F with the magnet prepared with the single phase component of the same component, the magnet of the present invention has good remanence, intrinsic coercive force and other comprehensive magnetic properties and effectively reduces the content of heavy rare earths of the magnet, thereby saving the production cost.

Description

technical field [0001] The invention relates to the field of magnetic materials, in particular to a high remanence and high coercivity R-T-B permanent magnet material and a preparation method thereof. Background technique [0002] with R 2 T 14 R-T-B (R represents a rare earth element including Y, and T is a transition metal including Fe) permanent magnet material with B-type compound as the main phase has high remanence, high coercive force, and high magnetic energy product. It is used in modern industry and It has been widely used in electronic technology, such as electronic computer, automatic control system, motor and generator, nuclear magnetic resonance imager, audio device, material sorting device, communication equipment and many other fields. [0003] Main phase Nd 2 Fe 14 The magnetic induction intensity Br of B is very high, about 1.61T (16.1kGs), and the theoretical maximum magnetic energy product BHmax can reach 512kJ / m 3 ,Nd 2 Fe 14 B has a very high ani...

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Problems solved by technology

[0005] The main magnetic phase of current magnets is not stoichiometric Nd 2 Fe 14 B, generally contains excessive boron element B and rare earth element R, and contains Co, and some non-magnetic phase elements such as Al, Ga, Cu, Nb, Sn, Zn, Zr, etc., to improve the coercive force performance of the magnet, However, due to the addition of non-magnetic elements and non-magnetic phases, the remanence of the magnet will be reduced.

Another method is the process of adding auxiliary alloy powder in the form of grain boundary addition, that is, the composition is made of one or more elements such as Al, Ga, Co, Cu, Nb, Zr, and rare earth R to make metal powder or alloy powder , added to Nd 2 Fe 14 In the B phase-based powder, in order to achieve the effect of improving the grain boundary structure and increase the coercive force of the magnet, the addition of this grain boundary can compensate for the single main phase, double main phase, and multiple main phases to a certain extent. Grain boundary defects improve the stability of the magnet to a certain extent, but the effect is still not ideal

Because there is grain boundary segregation of rare earth R, Fe, B, etc. in the main phase composition, which makes the performance of the magnet unstable, usually a necessary excess of elements such as R, B, etc. is added to the main phase composition, which in turn leads to a remanence enhancement effect. Therefore, the addition of traditional grain boundary alloys can only improve the coercivity to a certain extent, and has a negative effect on improving the remanence, which will make it difficult to achieve high remanence and high coercivity magnets. Although the grain boundary diffusion technology has been developed, the grain boundary diffusion has a certain limit on the thickness of the magnet.

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