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发明公开
CN104254894A R-T-B系永久磁铁 有权

R-T-B系永久磁铁
摘要：
本发明提供一种既具有与现有的Nd-Fe-B系永久磁铁同等磁特性又是轻质且适合作为永久磁铁同步旋转电机的励磁用磁铁的R-T-B系永久磁铁。通过在形成主相的化合物的组成为(R1-x(Y1-zLaz)x)2T14B(R是由Ce、Pr、Nd、Sm、Eu、Gd、Tb、Dy、Ho、Er、Tm、Yb和Lu中的1种以上所构成的稀土元素，T是以Fe或Fe和Co为必要元素的1种以上的过渡金属元素，0.0＜x≤0.5，0.0＜z≤0.5)的情况下，令占据四方晶R2T14B结构中的4f晶位的Y为Y4f且占据4g晶位的Y为Y4g时的，存在比率Y4f/(Y4f+Y4g)为0.8≤Y4f/(Y4f+Y4g)≤1.0，从而得到既具有与现有的Nd-Fe-B系永久磁铁同等磁特性又轻质的磁铁。
摘要（英）：

To provide an R-T-B-type permanent magnet that is lightweight despite having equivalent magnetic properties to conventional Nd-Fe-B-type permanent magnets, and that is favorable as the field magnet of a permanent magnet synchronous rotary machine. In the case that the composition of a compound forming the primary phase is (R1-x(Y1-zLaz)x)2T14B (where R is a rare earth element comprising at least one of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu; T is at least one transition metal element requiring Fe or Fe and Co; x is more than 0.0 and less than or equal to 0.5; and z is more than 0.0 and less than or equal to0.5), the ratio (Y4f/(Y4f+Y4g)) of the presence of Y4f, which is the Y occupying the 4f sites in a tetragonal R2T14B structure, and Y4g, which is the Y occupying the 4g sites, is such that Y4f/(Y4f+Y4g) is more than or equal to 0.8 and less than or equal to 1.0,and thereby a magnet that is lightweight despite having equivalent magnetic properties to conventional Nd-Fe-B-type permanent magnets is obtained.

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