To reduce the Nd–Fe–B material cost and balance the utilization of rare earth sources, the misch metal (MM) substitution for Nd in the sintered magnet attracts interest. Under the processing of fabricating Nd–Fe–B magnet, hydrogen decrepitation (HD) is widely used to obtain magnetic powder; however, the HD behaviors of RE–Fe–B strips based on MM may be complex. The HD behaviors of the [(Pr, Nd)_1–xMM_x]_30.8Fe_balCo_1.4 B_0.97 ( $x $ = 0–1) strips were studied under 0.2 MPa pressure. We find that it is similar to the Nd–Fe–B, 2:14:1 tetragonal structure of RE–Fe–B strips based on MM which is not broken during hydrogen decrepitating. But the REFe₂ phase in MM_30.8Fe_balCo_1.4B_0.97 disappears dramatically as a result of hydrogenation. For the samples with MM, the HD process is quicker and the particle size gets smaller than that for free MM, especially for samples with 35 wt.% MM, which may be attributed to La and Ce elements.

中文翻译：

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基于混合稀土的新型 RE-Fe-B 带材铸造合金的氢爆裂行为

为了降低 Nd-Fe-B 材料成本并平衡稀土资源的利用，烧结磁体中混合稀土（MM）替代 Nd 引起了人们的兴趣。在制造Nd-Fe-B磁体的过程中，氢爆（HD）被广泛用于获得磁粉；然而，基于 MM 的 RE-Fe-B 条带的 HD 行为可能很复杂。[(Pr, Nd) _1–X毫米_X] _30.8 Fe _bal Co _1.4 B _0.97 ( $x $ = 0–1) 在 0.2 MPa 压力下研究了条带。我们发现它类似于基于 MM 的 RE-Fe-B 带的 Nd-Fe-B，2:14:1 四方结构，在氢爆裂过程中不会断裂。但是由于氢化作用，MM _30.8 Fe _bal Co _1.4 B _{0.97 中}的REFe ₂相急剧消失。对于含有 MM 的样品，HD 过程更快，粒径比游离 MM 的小，尤其是对于含有 35 wt.% MM 的样品，这可能归因于 La 和 Ce 元素。