摘要 |
PURPOSE:To heighten Curie point of a composed alloy and improve the temperature characteristics by replacing a part of Fe which is a main component of an FeBR ternary magnet with Co. CONSTITUTION:A permanent magnet which is a sintered body of a magnetic anisotropic material is composed of following components (% means atomic percentage): 8-30% of R (R means at least one of rare-earth group elements including Y.), 2-28% of B, at least one of elements X (less than 3.5% of Cu, less than 2.0% of S, less than 4.0% of C and less than 3.5% of P) whose total atomic percentage is less than 4.0%, less than 50% (but not 0%) of Co and the remainder of Fe and impurities unavoidable for manufacture. With this constitution, an alloy which has Tc of arbitrary value between 400-800 deg.C can be obtained by controlling Co quantity for replacement. |