| 摘要 |
PURPOSE:To offer a rare earth-iron system permanent magnet of high performance and low cost by performing hot working at the fixed temperature, fining crystal grains, orienting a crystal axis to a specific direction and making the alloy magnetic anisotropic after having composition as shown in the expression of R, Fe, B and M and melting to cast the alloy composed of R, B and M of the specific quantity and impurities. CONSTITUTION:The permanent magnet has composition shown in the expression RFeBM, melts to cast the alloy composed of R of 8-30% (however, R is a kind of rare earth elements containing Y), B of 2-28%, M of 6% or less (here, M is a kind of elements in which R-M binary system eutectic temperature less than the temperature of R-Fe system) in atomic percentage and the residual which shows iron and the other inevitable impurities in production, thereafter hot working of an ingot is performed at 500 deg.C or higher, crystal grains are fined, a crystal axis is oriented to the specific direction and a casting alloy is made magnetically anisotropic. The materialization example of M is a kind of Cu, Ag, Au and Z. |
