2:17‐type SmCo permanent magnets with controllable remanence temperature coefficients via substitution of heavy rare earth elements

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Abstract
摘要: 在精密仪器等应用中，需要可以在宽温度范围内保持恒定磁通量的永磁体。2:17型SmCo永磁体由于其优异的高温磁性，并且可以通过添加重稀土元素（HRE）进一步对其调控，有望用于该类仪器。然而，HRE对磁性能的不同影响仍有待系统研究。在本研究中，利用粉末冶金法制备了名义成分为Sm24.5‐xHRExCo51.1Fe15.6Cu5.7Zr3.1（HRE = Gd, Tb, Dy；x = 0、5.1, 7.7, 10.3 wt%）的HRE掺杂SmCo磁体，研究了其在25‐300 °C温度范围的磁性能，包括最大磁能积( BH )max、剩磁Br和剩磁温度系数（α）。发现随着HRE含量增加，Br、( BH )max和|α|降低。在相同掺杂含量下，Gd掺杂的SmCo永磁体具有比Tb/Dy掺杂的磁体更高的Br和( BH )max，但该磁体的|α|值也相对较大。Tb和Dy对Br和α的影响相似。这些差异与重稀土元素化合物的内禀性质及其在胞状组织结构的分布密切相关。本研究有助于理解和设计高性能的温度补偿SmCo永磁体。
Funding Information
  • National Key Research and Development Program of China (2021YFB3501600)
  • National Key Research and Development Program of China (2022YFB3505302)
  • National Natural Science Foundation of China (52001019)
  • National Natural Science Foundation of China (52031001)
  • National Natural Science Foundation of China (52121001)
  • National Key Research and Development Program of China (2021YFB3501600)
  • National Key Research and Development Program of China (2022YFB3505302)
  • National Natural Science Foundation of China (52001019)
  • National Natural Science Foundation of China (52031001)
  • National Natural Science Foundation of China (52121001)
  • Young Elite Scientists Sponsorship Program by CAST (2023QNRC001)

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