Highly thermostable rare-earth permanent magnetic material, preparation method thereof and magnet containing the same

US11101057B2 · kind B2 · utility

Assignee

• GRIREM ADVANCED MATERIALS CO., LTD. · CN

Inventors

• Guiyong Wu · Beijing, CN
• Yang Luo · Amherst, US
• Hongwei Li · Burnaby, CA
• Yuanfei Yang · Beijing, CN
• Dunbo Yu · Beijing, CN
• Ningtao Quan · Beijing, CN
• Chao Yuan · Plainsboro, US
• Wenlong Yan · Beijing, CN

Key dates

• Filing date: Jan 11, 2018
• Grant date: Aug 24, 2021
• Expiry date: Feb 14, 2039

Classification

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

Abstract

Provided are a highly thermostable rare-earth permanent magnetic material, a preparation method thereof and a magnet containing the same. A composition of the rare-earth permanent magnetic material by an atomic percentage is as follows: SmxRaFe100-x-y-z-aMyNz, wherein R is at least one of Zr and Hf, M is at least one of Co, Ti, Nb, Cr, V, Mo, Si, Ga, Ni, Mn and Al, x+a is 7-10%, a is 0-1.5%, y is 0-5% and z is 10-14%.