Abstract
Mischmetal (MM30Nd70)30.4Fe68.2Al0.4Cu0.2B0.8 bulk magnets have been prepared with strip casting method followed by hydrogen decrepitating, jet milling, sintering and annealing. Process conditions to achieve optimum magnetic properties have been established through experimentations. XRD studies revealed main tetragonal RE2Fe14B phase and less RE-rich and CeFe2 phases. Microscopic examinations elucidated that magnet microstructure composed of main magnetically MM2Fe14B hard phase, RE-rich intergranular phase and magnetically soft CeFe2 phase. Henkel plot demonstrated the existence of exchange coupling between magnetic phase grains. Thermal studies showed Curie temperature of 278 °C for the Mischmetal (MM30Nd70)30.4Fe68.2Al0.4Cu0.2B0.8 magnet. Magnetic evaluations provoked coercivity Hcj of 619kA/m, remanenec Br of 1.15 T and maximum energy product density of 241 kJ/m3 for the (MM30Nd70)30.4Fe68.2Al0.4Cu0.2B0.8 magnetic alloy.
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