Effects of the conventional HDDR process and the additions of Co and Zr on anisotropy of HDDR Pr–Fe–B-type magnetic materials
Effects of the conventional HDDR process and the additions of Co and Zr on anisotropy of HDDR Pr–Fe–B-type magnetic materials
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DOI：
10.1016/j.jmmm.2008.10.048
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发表时间：
2009-05
影响因子：
2.7
通讯作者：
Jingzhi Han;Shunquan Liu;Changsheng Wang;Hai-ying Chen;H. Du;Yingchang Yang
中科院分区：
文献类型：
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作者：
Jingzhi Han;Shunquan Liu;Changsheng Wang;Hai-ying Chen;H. Du;Yingchang Yang
研究了常规氢化歧化脱附复合(HDDR)工艺及添加Co、Zr对HDDR PrFeB型磁性材料各向异性的影响。结果表明，随着歧化时间的延长，常规HDDR Pr13Fe80B7材料的各向异性程度单调减小，较短的歧化时间有利于制备高各向异性的Pr13Fe80B7材料。然而，值得注意的是，在相同歧化时间下，常规HDDR Pr13Fe80B7材料的各向异性程度明显小于固态HDDR Pr13Fe80B7材料。同时发现，在相同的HDDR工艺下，添加Co和Zr可以使HDDR Pr-Fe-B材料具有比HDDR纯三元Pr13Fe80B7材料更高的各向异性，但它们的各向异性程度也会随着歧化时间的延长而单调地减小，当歧化时间大于20h时，各向异性程度将接近于零。在此基础上，通过对上述合金歧化产物的X射线衍射分析，讨论了各向异性的来源。结果表明，添加Co或Zr的HDDR Pr-Fe-B材料各向异性的来源可能不同于HDDR纯Pr13Fe80B7材料的各向异性来源，前者可能来自剩余的Pr2(Fe，Co，Zr)14B核，而后者不是。最后还发现，添加Co或Zr的HDDR Pr-Fe-B材料即使在较高的脱附温度下也能获得较高的磁性能，这表明添加Co和Zr可以使HDDR Pr-Fe-B材料具有更大的加工温度范围。
Effects of the conventional hydrogenation disproportionation desorption recombination (HDDR) process and the additions of Co and Zr on anisotropy of HDDR PrFeB-type magnetic materials are investigated. The results show that the degree of anisotropy in conventional HDDR Pr13Fe80B7materials decreases monotonically with the prolonged disproportionation time, and short disproportionation time is helpful for preparing highly anisotropic Pr13Fe80B7material. However, it is notable that the degree of anisotropy in conventional HDDR Pr13Fe80B7materials is significantly smaller than that in solid-HDDR Pr13Fe80B7materials with the same disproportionation time. At the same time, it is found that the addition of Co and Zr may make HDDR Pr–Fe–B materials that have higher anisotropy compared with HDDR pure ternary Pr13Fe80B7materials under the same HDDR process, but their degree of anisotropy will also decrease monotonically with the prolonged disproportionation time, and will be close to zero when the disproportionation time is greater than 20h. Based on this, the origin of anisotropy is discussed by X-ray diffraction (XRD) investigations for the disproportionated products of the above alloys. The results show that the origin of anisotropy in HDDR Pr–Fe–B materials with the addition of Co or Zr may differ from that in HDDR pure Pr13Fe80B7materials, and the former maybe from the residual “Pr2(Fe,Co,Zr)14B” nucleus while the latter is not. Finally, it is also found that HDDR Pr–Fe–B materials with Co or Zr can obtain high-magnetic properties even if the high-desorption temperature is used, and this shows the addition of Co and Zr may make HDDR Pr–Fe–B materials that have a larger process temperature range.