Title :
Characterization and microwave absorbing properties of Nd-Fe-Ti intermetallic compounds derived from Nd-Fe-B sintered magnet scraps
Author :
Horikawa, Takashi ; Miura, Kouji ; Itoh, Masahiro ; Machida, Ken-Ichi
Author_Institution :
Center for Adv. Sci. & Innovation, Osaka Univ., Japan
fDate :
6/1/2005 12:00:00 AM
Abstract :
Nd-Fe-Ti intermetallic compounds were prepared from rare earth sintered magnet scrap powders (Nd2Fe14B sludge) and Ti by arc-melting and solidification processes. The resulting alloy ingots were ground into fine powders and some of them were heated at 100°C-250°C for 1-12 h in air. The epoxy resin composites with 83 wt% of these powders showed good microwave absorption properties at gigahertz range, and the maximum absorption peak of -39.4 dB was observed at 12.3 GHz after heating at 250°C for 3 h in air. Compared to Fe-Ti intermetallic compound powders prepared from fresh metals of Fe and Ti, the sludge-derived Nd-Fe-Ti powders showed higher oxidation resistivity due to the preferential oxidation of Nd content.
Keywords :
composite materials; electromagnetic wave absorption; ferromagnetic materials; heat treatment; iron alloys; magnetic particles; microwave materials; neodymium alloys; polymers; titanium alloys; 100 to 250 C; 12.3 GHz; Fe-based intermetallic compound; Nd-Fe-B sintered magnet scraps; Nd-Fe-Ti intermetallic compounds; Nd2Fe14B; NdFeTi; alloy ingots; epoxy resin composites; fine powders; microwave absorbing properties; microwave absorption properties; oxidation effect; rare earth sintered magnet scrap powders; Conductivity; Electromagnetic heating; Electromagnetic wave absorption; Epoxy resins; Intermetallic; Iron; Magnetic properties; Neodymium; Oxidation; Powders; Fe-based intermetallic compound; Nd-Fe-B sintered magnet scrap; microwave absorption; oxidation effect; sludge;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.848784
