Nd-(Fe, Co, Ni)-B 擬三元系磁石合金の磁気特性と耐蝕性

抄録

Melt-spun ribbons and sintered materials with the composition of Nd₁₅(Fe_1-x-yCo_xNi_y)₇₇B₈ were investigated with respect to saturation magnetization, coercivity, Curie temperature and corrosion characteristics. It was found that double substitutions of Co and Ni atoms for Fe atoms enhance the intrinsic coercivity of sintered magnets for compositions of 0.2≤x≤0.4 and 0.0≤y≤0.2, and improve corrosion resistance. A further addition of Ti atoms to the system increases the coercivity and makes the demagnetization curve rectangular. For example, (BH)_max and intrinsic coercivity in Nd₁₅(Fe_0.585Co_0.30- Ni_0.10Ti_0.015)₇₇B₈ amount to 33.8 MGOe and 10.4 kOe, respectively.