DEVELOPMENT OF BONDED Sm-Fe-N MAGNET USING REDUCTION AND DIFFUSION METHOD

摘要

High performance Sm_2Fe_(17)N_3 magnet powder is developed nitriding Sm_2Fe_(17) alloy mat is made using a reduction and diffusion method. Typical remanence, coercivity and maximum energy product of the fine powder are 1.40 T, 1.13 T and 323 kJ/m~3, respectively. Decreasing samarium content, oxygen content and the amount of #alpha#-Fe are found to be the important factors to realize high-energy product. High performance injection molded Sm_2Fe_(17)N_3 anisotropic magnet is also developed using me powder and an original binder system developed in order to mold at low temperature. Typical remanence, coercivity and maximum energy product obtained are 0.77 T, 0.78 T and 103 kJ/m~3, respectively in me density of 4.77 Mg/m~3. The temperature coefficient of remanence is -0.07 percent /K and that of coercivity is -0.54 percent /K. The initial irreversible flux loss of the magnet that has a permeance of two is -5 percent at 100 deg C and the irreversible flux loss of it is -4.4 percent exposing it at 80 deg C for 1000h.