High-performance permanent-magnet RE alloy and its making process

Application Number: 00107375
Application Date: 2000.05.12
Publication Number: 1271169
Publication Date: 2000.10.25
Priority Information:
International: H01F1/057
Applicant(s) Name: Qinghua Univ.
Inventor(s) Name: Jiang Zhongliang;Nishimoto Mutsuo;Yang Changping
Patent Agency Code: 11201
Patent Agent: ding yanglie
Abstract The high-performance permanent magnet RE alloy has a double-phase metallurgical tissue with hard magnetic Nd2Fe14B phase and soft magnetic Alpha-Fe phase as main parts. In the crystallite borders of different phases, there is very thin film of non-magnetic metal elements, which have atom radius between that of Fe and Nd atoms and are different to form solid solution with Fe and Nd. The non-magnetic metal elements are at least one of Nb, Zr, Ta and Hf. The thickness of the very thin film is 10-20 angstroms, and the crystallite size in different phase is 5-100 nm, preferably 10-40 nm.