| 摘要 |
PURPOSE:To manufacture a magnet material contg. rare earth elements and having superior corrosion resistance by adding specified percentages of Nd, Dy, B, Co, Al and C to Fe and providing a tetragonal structure to the principal phase of the resulting material. CONSTITUTION:This magnet material contg. rare earth elements consists of, by atom, 12-17% in total of 11-15% Nd and 0.2-3.0% Dy, 5-8% B, 0.5-13% Co, 0.5-4% Al, <=1000 ppm C and the balance Fe with inevitable impurities or further contains 0.1-1.0% Ti or Nd. The principal phase of the material has a tetragonal structure. The inevitable impurities include P, S, Cu, Mn and Ni and the amount of O2 is preferably restricted to <= about 8000 ppm. When a magnetic field is applied to the magnet material in a pressing state in a direction perpendicular to the pressing direction, the material has superior magnet characteristics such as >=about 30 M Oe (BH)max and >=about 13 kOe iHc and also has high corrosion resistance. |
