The mischmetal-based sintered magnets were prepared by mixing MM8.8Nd3.4Fe81.8B6 (MM denotes mischmetal)
with Nd15Fe79B6 alloys. The magnet consist of two main phases i.e., (La,Ce)-rich main phase and Ndrich
main phase. For the mass ratio of 8:2 of MM8.8Nd3.4Fe81.8B6 and Nd15Fe79B6, many grains of La-Ce-rich
main phase are interconnected and the effect of enhancing the coercivity is weak in the sintered magnets. While
for the mass ratio of 6:4 most grains of (La,Ce)-rich main phase are nearly separated and covered by the Ndrich
main phase and intergranular phase, and the coercivity increases significantly to 7.70 kOe. Compared with
(MM0.3Nd0.7)30.3FebalB0.96Cu0.1Al0.11 magnets prepared by the conventional method, the coercivity doesn’t
decrease in the sintered composite magnets of MM8.8Nd3.4Fe81.8B6/Nd15Fe79B6 though the MM content of 40
wt.% is higher. The optimization of Nd-rich-main-phase distribution as well as Nd substitution for La-Ce
should be responsible for the significant increase of coercivity.