Abstract
Anisotropic CeCo4.325−xCu0.675Fex (x = 0.475−0.875) sintered magnets were prepared by traditional powder metallurgical method. Influence of ball-milling time and iron content on microstructure and magnetic properties of the CeCo4.325−xCu0.675Fex sintered magnets were investigated. It is shown that the properties of the magnet produced by magnetic powders ball-milled for 40 min are better than that for 30 min. With iron content increasing, remanence Br and maximum energy product (BH)m increase first and then decrease. The optimal magnetic properties are obtained for the CeCo3.65Cu0.675Fe0.675 sintered magnet: Br = 0.685 T, the intrinsic coercivity Hci = 350 kA·m−1, and (BH)m = 85.6 kJ·m−3. The increase of Br is mainly influenced by iron content of 1:5 matrix which can properly increase the saturation induction Bs; the rapid increase of the amount of Ce-rich phase and 5:19 phase gives rise to the deterioration of the magnets when x ≥ 0.775.
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