| 简介 |
PROBLEM TO BE SOLVED : To provide a rare earth magnet of a Nd-Fe-B system having a high coercive force and excellent corrosion proof characteristics.
SOLUTION : The rare earth magnet contains the R2T14B phase (R is one or more kinds of element group of Nd, Pr, Dy, Tb, Ho, and T is one or more kinds of element group of Fe, Co, and Ni), and the R2T14B phase includes oxygen of 0.3 atom% to 1.3 atom% for the entire part of the R2T14B phase. The method of manufacturing the rare earth alloy including the R2T14B phase (R is one or more kinds of element group of Nd, Pr, Dy, Tb, and Ho, T is one or more kinds of element group of Fe, Co, and Ni) comprises a process to form a rare earth alloy in the composition of RxTyBz (0.05≤x≤0.30, 0.50≤y≤0.90, 0.01≤z≤0.30, x+y+z=1.00), a hydrogen absorbing process to heat the alloy in the atmosphere including hydrogen gas, a hydrogen releasing process to heat the alloy in the pressurized atmosphere lower than the atmospheric condition, and an oxygen diffusing process to heat the alloy in the atmosphere including oxygen. |
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