Temperature feature of NdDyFeB magnets with ultrahigh coercivity
1991; American Institute of Physics; Volume: 69; Issue: 8 Linguagem: Inglês
10.1063/1.347984
ISSN1520-8850
AutoresWei Gong, Qingsheng Li, Lin Yin,
Tópico(s)Magnetic properties of thin films
ResumoThe intrinsic coercivities Hc of Nd14DyxFe79−xB7 magnets, prepared by a powder metallurgical method, with an addition of Dy (x=2 at. %), reached 21 kOe. The intrinsic coercivity Hc was kept over 10 kOe when the heating temperature was 150 °C and the temperature coefficient α(Hc) = −0.35%/°C was in a temperature range of 16–150 °C. After aging at 120 °C for 400 h, the intrinsic coercivities Hc and magnetic energy products (BH)max of the magnets did not change as usual, remaining at Hc = 21 kOe and (BH)max = 30 MGOe. The NdFeB magnets with all kinds of the intrinsic coercivities were compared at various temperatures also. The experimental results show that high-temperature features of the NdFeB magnets were improved by increasing the intrinsic coercivity.
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