一级回火和烧结温度对掺Dy2O3的Nd-Fe-B磁性能影响

Zhejiang University, Hangzhou 310027, China

摘要:

研究了一级回火和烧结温度T对掺Dy2O3烧结钕铁硼磁体的磁性能和微观结构的影响。结果表明：一级回火和烧结温度对磁体磁性能影响显著，尤其对矫顽力Hcj的影响。当添加2%（质量分数，下同）的Dy2O3时，一级回火可以明显提高磁体的Hcj，但烧结温度影响甚微；当添加5%的Dy2O3时，随烧结温度的提高，磁体的Hcj显著提高，但是一级回火使Hcj提高不明显。这主要归因于：一是Dy2O3发生置换反应生成Nd2O3颗粒影响烧结和回火制度，二是烧结温度影响Dy原子扩散。

Abstract:

The effects of first annealing and sintering temperature on the microstructures and magnetic properties of Dy2O3 doped Nd-Fe-B magnets were investigated. Results show that the effect of first annealing and sintering temperature on magnetic properties is remarkable, especially on the coercive force Hcj, which is closely related to the content of Dy2O3. When the added content of Dy2O3 is 2%, the first annealing can improve Hcj obviously, whereas the effect of sintering temperature is very unconspicuous. When the added content of Dy2O3 is 5%, Hcj is improved evidently with the increase of sintering temperature; however, the first annealing increases Hcj lightly. This is mainly attributed to the following reasons: on one hand, Dy2O3 is reduced to form Nd2O3 particles affecting sintering and annealing system; on the other hand, sintering temperature impacts the diffusion of Dy atom.