| 초록 |
We fabricated Nd2Fe14B hard magnetic particles with various sizes via spray drying, followed by reduction-diffusion. Spray drying is widely used to produce nearly spherical particles that are relatively homogeneous. The precursor particles were prepared by spray drying using the aqueous solution containing Nd salts, Fe salts and boric acid with the target stoichiometric composition of Nd2Fe14B. The sizes of the spray-dried particles are in the range from sub-micrometers to several tens of micrometer, which adjusted by controlling the concentration of precursor solution. The obtained precursor particles were subjected to subsequent treatments including hydrogen reduction, calcium reduction and washing. The size effect of precursor particles on the formation of Nd2Fe14B phase and magnetic properties were investigated. |
