| The magnetic properties of Fe-Co-Nd-B magnet were examined using rapidly solidified amorphous powders of Nd (Fe_(0.92)-xCo_xB_(0.08))_(5.5)+y wt% ZrB₂composition. Magnets were prepared by sintering the crystallized powders, and cold isostatic pressing followed by sintering. In the as-spun magnet alloys, coercivity increases as the y increases up to x=0.17 when B/Nd ratio is constant. However, above the x=0.22, the maximum coercivity was obtained when y=2 and iHc=17.4 kOe at that composition. Curie temperature has been found to increase almost linearly with the addition of Co in the range of x=0.07∼0.22, and the maximum Tc was 491℃ when x=0.22. Laves phase, Nd(Fe_(0.5)Co_(0.5))₂always form in the sintered magnet(where x ＞ 0.17) prepared by both powder metallurgy process and cold isostatic pressing followed by sintering. |
|
