Grirem Advanced Materials Co., Ltd.

Rare Earth Functional Materials (xiong'an) Innovation Center Co., Ltd.

Griceon (rongcheng) Co., Ltd.

Xinyuan Bai

Wei Zhu

Yang Luo

Dunbo Yu

Xiao Lin

Zilong Wang

Haijun Peng

Shengjie Zhu

The present invention relates to an R-T-B sintered magnet and a preparation method thereof. The sintered magnet includes a grain boundary region T, a shell layer region Tand an RFeB grain region T; at 10 &#x3bc;m to 60 &#x3bc;m from a surface of the sintered magnet toward a center thereof, an area ratio of the shell layer region Tto the RFeB grain region Tis 0.1 to 0.3, and a thickness of the shell layer region Tis 0.5 &#x3bc;m to 1.2 &#x3bc;m; and an average coating percent of the shell layer region Ton the RFeB grain region Tis 80% or more. In the present invention, by optimizing a preparation process and a microstructure of a traditional rare earth permanent magnet, diffusion efficiency of heavy rare earth in the magnet is improved, such that coercivity of the magnet is greatly improved, and manufacturing cost is reduced.

R-T-B sintered magnet and preparation method thereof

Growing community of inventors

Beijing, China

Xinyuan Bai