Anisotropic nanocrystalline rare earth permanent magnet and preparation method thereof

US12334236B2 · kind B2 · utility

Assignee

• Sichuan University · CN

Inventors

• Ying Liu · Iowa City, US
• Renquan Wang · Sichuan, CN
• Jun Li · Miaocheng, CN
• Hongxing Chen · Shanghai, CN
• Yao Xiao · Beijing, CN

Key dates

• Filing date: Dec 21, 2023
• Grant date: Jun 17, 2025
• Expiry date: Dec 21, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C2202/02
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed are an anisotropic nanocrystalline rare earth permanent magnet and a preparation method thereof. The rare earth permanent magnet includes an RE-Fe—B matrix phase and a second phase, wherein the RE-Fe—B matrix phase includes main phase RE2Fe14B flaky nanocrystallines regularly arranged and an RE-rich phase around main phase grains, the main phase RE2Fe14B flaky nanocrystallines having an average grain size in a length direction of 70 nm to 800 nm and an average grain size in a thickness direction of 30 nm to 200 nm; and the second phase includes at least one selected from the group consisting of an M-Cu phase and an M-Cu—O phase, M being at least one selected from the group consisting of Ca and Mg.