Effects of Cr Addition on Coercivity of Fe-B/Nd₂Fe₁₄B Based Nanocomposite Magnets

Abstract

We investigated influences of various elements (Ti, Nb, Zr, Mo, Ta, Hf, W, V, Cr) on magnetic properties of Fe-B/Nd₂Fe₁₄B based Nd-Fe-B-Ti-C nanocomposite magnets in order to obtain larger coercivity for high temperature applications. As a result, addition of Cr was found to be most effective to enhance coercivity dramatically. Thermal flux losses of high-coercivity (H_cJ=1609kA/m) Nd-Fe-B-Ti-C-Cr nanocomposite magnet at 473K are less than 2%.