Low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet and production method thereof

Abstract

The invention relates to the technical field of rare earth neodymium-iron-boron permanent magnet material, in particular to a low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet and a production method thereof. Composition of the low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet is expressed as: Re Alpha Fe(100-Alpha-Beta-NuB Beta)MNu. The production method includes: mixing alloy powder and rare earth micro powder, pressing the mixture under the orientation field with intensity not smaller than 1.5T to obtain a blank; sintering at the temperature of 1050-1120 DEG C to obtain low-weight rare earth high-coercivity sintered neodymium-iron-boron magnet. The rare earth neodymium-iron-boron permanent magnet material produced by the method and products of the material have well uniform properties, heavy rare earth consumption is low, and coercivity is high.

Description

technical field [0001] The invention relates to the technical field of rare earth NdFeB permanent magnet materials, in particular to a low-weight rare earth high coercivity sintered NdFeB magnet and a preparation method thereof. Background technique [0002] Rare earth NdFeB permanent magnet material is the third generation rare earth permanent magnet functional material invented in the early 1980s. Its excellent magnetic properties of high remanence, high coercive force and high magnetic energy product are unique to other permanent magnet materials. It is irreplaceable, so it is widely used in various fields of national economy such as energy, transportation, machinery, electronics, etc. and has become one of the important basic materials supporting the contemporary electronic information industry, leading electronic products to the direction of energy saving, environmental protection, high efficiency, and portability Growing. Even in the world, the per capita consumption ...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the present situation that the high coercive force of rare earth NdFeB permanent magnet materials depends on heavy rare earth elements Dy, Tb and Ho, and provides a low-heavy rare earth high coercive force sintered NdFeB magnet and its preparation method. In the production process, the rare earth element powder is used to effectively compensate the effective phase of the NdFeB rare earth permanent magnet - the neodymium-rich phase to make up for the loss of the Nd-rich phase of the rare earth NdFeB permanent magnet during the production process, so that in the preparation process Reduce the use of heavy rare earth elements and obtain mass production of low heavy rare earth high coercive force NdFeB rare earth permanent magnet materials and their products with excellent performance consistency