Magnetization stabilizing treatment method for permanently magnetizable material
AssigneeNingbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences
InventorsLei Liu, Aru Yan, Zhuang Liu, Xin Zhang, Yingli Sun
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Abstract
The present disclosure discloses a method for the magnetism stabilizing treatment of a permanent magnet material. The method can include the following steps: providing a permanent magnet material having a positive temperature coefficient of coercivity; magnetizing the permanent magnet material at a temperature T3 with a range of −200 degree centigrades to 200 degree centigrades; and performing a magnetism stabilizing treatment towards the permanent magnet material with temperature decreased in a range of the temperature T3 to a temperature T4, or at the temperature T3.
Claims5
A method for treating a permanent magnet material, wherein the method comprises the following steps:
- providing a permanent magnet material having a positive temperature coefficient of coercivity, the permanent magnet material comprises a microstructure having a first magnetic phase and a second magnetic phase, the first magnetic phase and the second magnetic phase are isolated from each other, the first magnetic phase is a magnetic phase with uniaxial anisotropy, and the second magnetic phase is a magnetic phase with spin reorientation transition, the coercivity of the permanent magnet material firstly decreases, then rises and finally decreases as the temperature increases, the permanent magnet material has the positive temperature coefficient of coercivity in a temperature range of T1 to T2, T2 is the maximum temperature of the temperature range of the positive temperature coefficient of coercivity;
- magnetizing the permanent magnet material at a temperature T3;
- and
- cooling the permanent magnet material to a temperature T4, and then raising the temperature to T3 again to perform a magnetism stabilizing treatment towards the permanent magnet material at a temperature range between the temperature T3 and the temperature T4, to make an easy magnetization direction of the second magnetic phase converse from easy plane to easy axis as temperature decreases,
- T3 is 300K, T4 is in a range of 100K to 200K,
- and the temperature T2 is higher than or equal to the temperature T4.
Dependencies are inferred from the claim text.