SmFe_7N_x+αFe系微細複合磁石のボンド特性と応用特性 Magnetic Properties of SmFe_7N_x+αFe Nanocomposite Magnets and their Application
Nanocomposite magnet materials with composition of (Sm<SUB>8</SUB>Zr<SUB>3</SUB>Fe<SUB>85</SUB>Co<SUB>4</SUB>)<SUB>85</SUB>N<SUB>15</SUB> were prepared by rapidly quenching method including heat treatment and nitrogenation. The ranges of grain sizes are 20-40nm. X-ray diffraction study indicated that hard phase is SmFe<SUB>7</SUB>N<SUB>x</SUB>, and that soft phase are a-Fe. By compositional analysis of fine grains using TEM-EDS, it is revealed that magnetically hard phase of SmFe<SUB>7</SUB>N<SUB>x</SUB> have a composition of Sm richer ratio than that of 1-7 stoichiometry. Magnetic properties of those powders were as follows : Br=0.99T, Hcj=656kA/m, (BH)max=140kJ/m<SUP>3</SUP>, Hk/H<SUB>cJ</SUB>=33%. Magnetic properties of their bonded with epoxy resin through die press process were as follows: Br=0.76T, Hcj=672kA/m, (BH)max=96kJ/m<SUP>3</SUP>, Hk/H<SUB>cJ</SUB> = 35%. Performance of spindle motors equipped those bonded fabricated in ring shape meets magnetic properties of bonded magnets.
粉体および粉末冶金 44(9), 833-838, 1997-09-15
Japan Society of Powder and Powder Metallurgy