The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 08, 2022
Filed:
Jun. 20, 2018
Grirem Advanced Materials Co., Ltd., Beijing, CN;
Guoke Re Advanced Materials Co., Ltd., Langfang, CN;
Yang Luo, Beijing, CN;
Hongbin Zhang, Beijing, CN;
Zhou Hu, Beijing, CN;
Dunbo Yu, Beijing, CN;
Ningtao Quan, Beijing, CN;
Yuanfei Yang, Beijing, CN;
Wenlong Yan, Beijing, CN;
Jiajun Xie, Beijing, CN;
GRIREM ADVANCED MATERIALS CO., LTD., Beijing, CN;
GUOKE RE ADVANCED MATERIALS CO., LTD., Langfang, CN;
Abstract
The present invention discloses rare earth-bonded magnetic powder and a preparation method therefor. The bonded magnetic powder is of a multilayer core-shell structure, and comprises a core layer and an antioxidant layer (), wherein the core layer is formed by RFeMB, R is Nd and/or PrNd, and M is one or more of Co, Nb, and Zr; and the core layer is coated with an iron-nitrogen layer (). In addition, the present invention also discloses the preparation method for the rare earth-bonded magnetic powder and a bonded magnet. The oxidation and corrosion of magnetic raw powder during phosphorization and subsequent treatment process are effectively prevented, thereby further improving the long-term temperature resistance and environmental tolerance of the material.