Fe含量对NdFe10.25TiNb0.25N/α-Fe永磁合金微观组织与磁性能的影响

Effect of Fe content on microstructure and magnetic properties ofNdFe10.25TiNb0.25N/α-Fe permanent magnet alloy

摘要:

从微观组织和磁性能方面研究了Fe含量对NdFe_10.25TiNb_0.25/Xwt.%α-Fe永磁合金的影响。合金铸锭均是由α-Fe相、1:12相和富Nd相组成,Fe含量增加,α-Fe相含量增加,1:12相含量减少。合金薄带晶粒尺寸随着Fe含量的增加而逐渐减小,并产生Fe₂Ti相,Fe₂Ti相和富 Nd 相含量随着Fe含量的增加而逐渐减少。当X≥15时,合金薄带只有1:12相和α-Fe相,平均晶粒尺寸减小到60 nm以下。渗氮后平均晶粒尺寸减小15%~20%,磁性能得到明显改善。X=15时,得到的氮化合金薄带磁性能较佳,矫顽力为1010 Oe,饱和磁化强度为130.7 emu/g,比X=0时矫顽力提高了25%,饱和磁化强度提高了12%。粘结后最大磁能积先下降后升高，X=15时最高，达到了4.03 MGOe，相比于X=0时的2.88 MGOe，增幅达到了40%。X=15时的氮化合金薄带高温结构稳定性较好，在360℃以下保持结构稳定，高温应用潜力大。

Abstract:

The effect of Fe content on NdFe_10.25TiNb_0.25/Xwt.%α-Fe permanent magnet alloy was studied in terms of microstructure and magnetic properties. Alloy ingot is composed of α-Fe phase, 1:12 phase and Nd-rich phase, Fe content increases, α-Fe phase content increases, and 1:12 phase content decreases. The grain size of the thin strip decreases gradually with the increase of Fe content, and Fe2Ti phase is produced. The contents of Fe₂Ti phase and Nd-rich phase decrease gradually with the increase of Fe content. When X≥15, the thin strip only has 1:12 phase and a-Fe phase, and the average grain size is reduced to less than 60 nm. After nitriding, the average grain size is reduced by 15%-20%, and the magnetic properties are obviously improved. When X=15, the obtained nitrided alloy thin strip has better magnetic properties, coercivity is 1010 Oe, saturation magnetization is 130.7 emu/g, which is 25% higher than that when X=0, and saturation magnetization is 12% higher. After bonding, the maximum magnetic energy product decreases first and then increases, and reaches the highest value at X=15, reaching 4.03 MGOe, which increases by 40% compared with 2.88 MGOe at X=0. The nitriding alloy thin strip at X=15 has good structural stability at high temperature, and maintains structural stability below 360℃, which has great application potential at high temperature.