| This study was carried out to investigate the effects of densification, formation of Nd-rich phase, and oxidation of powder and addition of Al₂O₃ on the magnetic properties of Nd-Fe-Co-B-Zr system. The sintered density increased with the growth of matrix grains and the formation of Nd-rich phase. The sintering reaction below 1100℃ was retarded when the powder surface was oxidized, and the sintered density was decreased by addition of Al₂O₃. The residual induction (Br) increased with the sintered density and the formation of Nd₂(Fe. Co)_(14)B phase. The coercivity (iHc) improved with Al₂O₃ addition, and reached at a maximum value after sintering at 1040℃. The oxidation of powder, however, decreased the coercivity value remarkably. |
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