Abstract
The effect of Cu additions on the magnetic properties and thermal stability of Nd-Ce-Fe-Co-B system ribbons has been investigated. The results show that the Cu additions can optimize grain boundary phase continuity, which decreases the exchange coupling effect and increases the coercivity from 1386.23 to 1511.97 kA m−1. Cu also facilitates the enrichment of Co at the grain boundary in magnets containing Ce, reduces the content of Co in the RE2Fe14B, and increases the remanence from 0.71 to 0.79 T, showing different results from the addition of Cu in the Nd-Fe-B system. In addition, Cu does not have a noticeable effect on the Curie temperature or the remanence temperature coefficient but does reduce the coercivity temperature coefficient to 0.3449%/K in the range of 303–493 K. The ribbons of Nd-Ce-Fe-Co-Cu-B exhibit better thermal stability.
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