(1. 合肥工业大学 材料科学与工程学院，合肥 230009；
2. 稀土永磁材料国家重点实验室，合肥 231500；
3. 先进功能材料与器件安徽省重点实验室，合肥 230009；
4. 北矿磁材(阜阳)有限公司，阜阳 236000；
5. 合肥工业大学 工业与装备技术研究院，合肥 230009)
摘 要: 采用Ho部分取代Nd，制备了不同Ho含量的Ho-Nd-Fe-B磁体，研究了Ho含量对Ho-Nd-Fe-B磁体的磁性能、温度稳定性和微观结构的影响。结果表明：Ho的添加有助于改善主相和富稀土相之间的浸润性，优化晶界富稀土相的分布，提高了磁体的内禀矫顽力，并改善了磁体的温度稳定性，但磁体的剩磁有所下降。当Ho含量(质量分数)由0增加到21.0%时，Hcj由1281 kA/m增加到1637 kA/m，Br由1.342 T降至0.919 T；在20~100 ℃范围内，磁体的剩磁温度系数 和矫顽力温度系数 分别由0.119%/℃和0.692%/℃降低到0.049%/℃和0.540%/℃；在180 ℃烘烤2 h后的磁通不可逆损失由54.80%降低到29.17%。
关键字: Ho-Nd-Fe-B磁体；磁性能；温度稳定性；微观结构
（1. School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China;
2. State Key Laboratory of Rare Earth Permanent Magnet Materials, Hefei 231500, China;
3. Key Laboratory of Advanced Functional Materials and Devices of Anhui Province, Hefei 230009, China;
4. BGRIMM Magnetic Materials and Technology (Fuyang) Co., Ltd., Fuyang 236000, China;
5. Institute of Industry and Equipment Technology, Hefei University of Technology, Hefei 230009, China）
Abstract:Ho-Nd-Fe-B magnets with different Ho contents were prepared by Ho substitution for part of Nd. The effects of Ho contents on the magnetic properties, temperature stability and microstructure of Nd-Fe-B magnets were studied. The results show that the addition of Ho is helpful to improve the wettability between the main phases and the rare-earth rich (RE-rich) phases, and optimizes the distribution of rare-earth rich (RE-rich) phases in grain boundary, and improves the intrinsic coercivity and the temperature stability of the magnets, but the remanence of the magnets decreases. When Ho content (mass fraction) increases from 0 to 21.0%, Hcj increases from 1281 kA/m to 1637 kA/m, and Br decreases from 1.342 T to 0.919 T; the remanence temperature coefficient and coercivity force temperature coefficient of magnets decrease from 0.119%/℃ and 0.692%/℃ to 0.049%/℃ and 0.540%/℃, respectively, in the range of 20-100 ℃. And the irreversible flux loss after being baked at 180 ℃ for 2 h decreases from 54.80% to 29.17%.
Key words: Ho-Nd-Fe-B magnets; magnetic property; temperature stability; microstructure
