Sintered neodymium-iron-boron magnet with high corrosion resistance and high magnetic performance, and preparation method therefor

Abstract

A sintered neodymium-iron-boron magnet with corrosion resistance and high magnetic performance, and a preparation method therefor are presented. The sintered neodymium-iron-boron magnet comprises Co at a content of 1.5-3.0 wt %, and comprises a main phase and a grain boundary phase, wherein Co is distributed in the grain boundary phase of crystalline grains and the main phase of crystalline grains. The sintered neodymium-iron-boron magnet satisfies: w1≥w2, wherein w1 is the content of Co distributed in the grain boundary phase of the crystalline grains, and w2 is the content of Co distributed in the main phase of the crystalline grains.

Dependencies are inferred from the claim text.