Development of rare-earth bonded magnet

Abstract

Rare-earth bonded magnets using two kinds of NQ powder are developed. The magnetic properties of them are comparable to those of S_m1C_o5 bonded magnet, if they are fully magnetized. But it is necessary to use magnetizing field larger than 20k0e which is an upper limit for iron yoke. Temperature characteristics of the. are worse than those of S_m1C_o5. There are little problem for corrosion resistance if they are produced with NaCl as little as possible and coated with thin plastic film.