Nd(FeTiNb)12N/α-Fe纳米复相永磁材料微观组织与磁性能

Nd(FeTiNb)12N/α-Fe nanocomposite permanent magnetic materialsmicrostructure and magnetic properties

摘要:

采用真空电弧熔炼和熔体快淬工艺分别制备了化学成分为Nd(FeTi)₁₂/ɑ-Fe与Nd(FeTiNb)₁₂/ɑ-Fe合金薄带,研究添加Nb元素以及不同氮化温度对合金微观组织和磁性能的影响。结果表明：Nb元素的添加可显著细化晶粒尺寸,同时提高了合金的非晶形成率。合金薄带经过晶化退火与渗氮处理后,磁性能有明显升高。Nd(FeTiNb)₁₂N/ɑ-Fe薄带的磁性能在渗氮温度为500 ℃时达到最佳,此时的剩磁(Br)和矫顽力(Hcj)分别为21.9 emu/g和700 Oe。

Abstract:

Thin strips of Nd(FeTi)₁₂/ɑ-Fe and Nd(FeTiNb)₁₂/ɑ-Fe alloys were prepared by vacuum arc melting and melt quenching processes to investigate the effects of the addition of Nb elements and different nitriding temperatures on the microstructure and magnetic properties of the alloys. The results show that the addition of Nb elements significantly refines the grain size and increases the amorphous formation rate of the alloy. The magnetic properties of Nd(FeTiNb)₁₂N/ɑ-Fe strips were significantly increased after crystallisation annealing and nitriding, and the best magnetic properties were achieved at a nitriding temperature of 500 °C, when the remanent magnetisation (Br) and coercivity (Hcj) were 21.9 emu/g and 700 Oe, respectively.