1995 年 19 巻 3 号 p. 717-722
An experiment was carried out to investigate the magnetic and physical properties of Sm-Fe-Cu-Nb-N compounds. These compounds were prepared by nitrogenation of an Sm2Fe17 compound with added x wt%Cu and 0.5 wt% Nb powders (about 30%μm) in high-purity nitrogen gas at pressures of 98 kPa and 4.9 MPa, and temperatures of 475-600°C for 1-4 h. The grain size of an ingot of Sm2Fe17 with added Cu and Nb was about 60% of that of an Sm2Fe17 ingot. It was found that the value of the anisotropy field (HA) in these compounds increased with increasing Cu (up to 1 wt%) concentration, while the saturation magnetization (σs) decreased. The values of HA and σs in nitride of Sm2Fe17 with added 1.0 wt%Cu and 0.5 wt%Nb were 10.03 MA/m and 189.8 × 10-6 Wb·m/kg, respectively. The magnetic and physical properties of an anisotropic Sm2Fe17 Cu0.148Nb0.067N2.97 epoxy-bonded magnet were Jr=0.83 T, HcJ=474 kA/m, HcB=351 kA/m, (BH)max= 103 kJ/m3, and D=5.50 Mg/m3. The reversible temperature coefficients (from 25 to 125°C) of the bonded magnet were α(Jr)= -0.058%/°C, and β(HcJ ) = -0.496%/°C.