Intrinsic evolution of novel (Nd, MM) 2 Fe 14 B-system magnetic flakes

摘要: The Nd-substituted (Nd x MM1−x )–Fe–B strip-casting flakes were prepared by induction melting in the vacuum furnace and then subsequently technology. microstructure magnetic properties of alloys are related to Nd substitution. 2:14:1 main phases minor impure coexist MM–Fe–B flake. For example, La2O3 CeFe2 obviously detected x = 0 specimen. As an increase Ce concentration is inversely accompanied with decrease content (x) )2Fe14B (0 ≤ x ≤ 1), XRD analysis shows that overall diffraction peaks shift right domestically because smaller radius Ce4+. point, spin reorientation phase transition temperature, Curie magneto-crystalline anisotropy field (at 300 K), magnetization (M 9T) for MM–Fe–B/(Nd0.4MM0.6)–Fe–B/(Nd0.7MM0.3)–Fe–B/Nd–Fe–B 1376.15/1414.15/1439.15/1458.15 K, 74/113/124/135 K, 493.2/538.4/559.7/582.3 K, 48/55.2/64.4/70.1 kOe 136.5/143.7/151.5/153.7 emu/g, respectively. Due varied composition hard phases, M 9T increases gradually (x). SEM observation EDX results demonstrate more Pr elements aggregate into ferromagnetic phase, while less La prone RE-rich region compared nominal ratio. a result, growth becomes extraordinary under maximum external 9 T, indicating (Nd0.7MM0.3)–Fe–B flake may display relatively good those higher have evident effect on magnetization, compositions, microstructures phases. Therefore, practical application )–Fe–B-sintered magnets will be very prospective.