Rare earth permanent magnetic powder, bonded magnet and device using the bonded magnet

US9859042B2 · kind B2 · utility

Assignee

• GRIREM ADVANCED MATERIALS CO., LTD. · CN

Inventors

• Yang Luo · Amherst, US
• Hongwei Li · Burnaby, CA
• Dunbo Yu · Beijing, CN
• Kuoshe Li · Beijing, CN
• Wenlong Yan · Beijing, CN
• Jiajun Xie · Changde, CN
• Shuai Lu · Beijing, CN

Key dates

• Filing date: Jul 2, 2012
• Grant date: Jan 2, 2018
• Expiry date: Feb 20, 2034

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C22C38/30
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

The application discloses a rare-earth permanent magnetic powder, a bonded magnet, and a device using the bonded magnet. The rare-earth permanent magnetic powder comprises 4 to 12 at. % of Nd, 0.1 to 2 at. % of C, 10 to 25 at. % of N and 62.2 to 85.9 at. % of T, wherein T is Fe or FeCo and the main phase of the rare-earth permanent magnetic powder is a hard magnetic phase with a TbCu7 structure. Material volatilization can be avoided effectively during a preparation process of the rare earth permanent magnetic powder, thus improving the wettability with a water-cooling roller during the preparation process and final prepared materials are provided with good magnetic properties.