High performance Nd-Fe-B permanent magnets without critical elements

作者：Pathak Arjun K^*; Gschneidner K A Jr; Khan M; McCallum R W; Pecharsky V K

来源：Journal of Alloys and Compounds, 2016, 668: 80-86.

DOI：10.1016/j.jallcom.2016.01.194

• Permanent magnet
• Coercivity
• Maximum energy product
• Nd2Fe14B
• Cerium

Scanning electron microscopy, and magnetization measurements reveal that as cast (Nd1-xCex)(2)Fe14B alloys contain significant amounts of alpha-Fe that can be dramatically reduced by annealing the alloys at 1000 degrees C for 3 days. The room temperature intrinsic coercivity, Hci, of (Nd0.8Ce0.2)(2.2)Fe14B melt spun ribbons was found to be 11 kOe, which is similar to 32-similar to 10% higher in comparison to that of Nd2Fe14B (Hci = 8.3 kOe), and (Nd0.8Ce0.2)(2.0)Fe14B (Hci = 10 kOe), respectively. The substitution of Co for Fe in (Nd0.8Ce0.2)(2)Fe14-zCozB significantly increases both T-C and the maximum energy product, (BH)max. Our study shows that both Co-containing and Co-free Ce-substituted Nd2Fe14B alloys have excellent magnetic properties at room temperature and above. The experimental results also demonstrate the potential of Nd-Ce-Fe-TM-B based alloys as alternative to expensive Dy-containing high performance rare earth magnets.

• 出版日期2016-5-25