晶界添加MgO对(PrNd)30Gd3Al0.8B1.03Fe余磁体磁性能影响

晶界添加MgO对(PrNd)30Gd3Al0.8B1.03Fe余磁体磁性能影响

张宏超¹，周俊琪^1*，张敏刚¹，冷艳丹¹,张西强²

(1.太原科技大学 材料科学与工程学院，山西 太原  030024；

2. 陕西东风车桥传动系统股份有限公司，陕西 铜川727000）

摘要：为研究晶界添加MgO对磁体(PrNd)₃₀Gd₃Al_0.8B_1.03Fe_余磁性能的影响，通过球磨混粉方式将其引入到烧结Nd-Fe-B晶界，利用扫描电镜分析磁体的显微组织。观察发现适量地添加MgO可以优化磁体显微结构，提高剩磁，矫顽力和最大磁能积，在当前实验条件下，加入0.2%的MgO磁体的磁性能最佳。

关键词：Nd-Fe-B磁体；磁性能；晶界显微结构

中图分类号:TG132.2⁺72；TG115.21⁺5.3           文献标识码：A

Effect of MgO added in grain-boundary on magnetic properties of (PrNd)₃₀Gd₃Al_0.8B_1.03Fe_余sintered magnet

ZHANG Hong-chao¹，ZHOU Jun-qi^1*，ZHANG Min-gang¹，LENG Yan-dan¹，ZHANG Xi-qiang²

（1.School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan Shanxi 030024；2.shanxi dongfeng Axle Co. Ltd, Tongchuan Shaanxi 727000, China）

Abstract: Grain-boundary with MgO powder was studied in this paper. MgO was introduced into the sintering Nd-Fe-B grain-boundary，which was expected to improve the magnetic properties of the Nd-Fe-B magnets by changing the microstructure grain-boundary. By scanning electron microscopy (SEM), the influence of MgO powder addition on the magnet grain- boundary and the main crystal phase was studied. By energy spectrum analysis, the distribution of the additives on the grain-boundary was investigated. Research results show that the proper addition of MgO powder did raise the magnetic of (PrNd)₃₀Gd₃Al_0.8B_1.03Fe_余., and the magnetic properties was the best with 0.2% of MgO.

Keywords：Nd-Fe-B magnets；magnetic properties；the microstructure grain- boundary

[1] 王会宗. 磁性材料及其应用[ M]. 北京：国防工业出版社，1989.

[2] 周寿增，董清飞．超强永磁体[ M]．北京：冶金工业出版社，2004：261-265．

[3] 周俊琪，张敏刚.  Ga、Tb的添加对烧结NdFeB磁体的显微组织和性能的影响[J]. 电子显微学报，2002，21（4）：446.

[4] 莫文剑，张澜庭，陈亮，等．添加Si3N4对烧结NdFeB的磁性能及抗腐蚀性能的影响[J].2007，中国稀土学报，5(5)：588-591.

[5] Chen zhongmin，Yan Aru，wang xiaotian. Effects ofintergranular additions of oxides on the coercivity，thermal  stability andmicrosrcture of Nd-Fe-B magnets[J]．Journal of MagnetismAnd Magnetic Materials，1996，(162)：307．

[6] Kim A S, Camp F E. The Role of oxy gen for improving Magnetic proper ties and thermal stability of sinter red ( Nd. Dy) FeCoB Magnets[ J].  IEEE Trans on Mangnet，1995, 31( 6) : 3656-3658.

[7] Howe D. Review of permanent magnet applications and the poten-tial for high energy magnets[C]. In：Long G J, Grandjean F eds. Supermagnets, hard magnetic materials. Dordrecht：Kluwer Academic Publishers, 1991，585.

[8] Tokunaga M, Kogure H, Endoh M. Improvement of thermal sta-bility of Nd-Dy-Fe-Co-B sintered magnets by additions of Al, Nb and Ga[J]. IEEE Trans Magn，1987, MAG-23(5): 2287.

[9] Hirosawa S, Tomizawa H, Mino S. Improvements of coercivity and corrosion resistance in Nd-Fe-Co-B sintered magnet by addition of V or Mo[J]. J Magn Soc Japan, 1991, 15(2): 245.

[10] Schrey P, Velicescu M. Influence of Sn additions on the magnetic and microstructural properties of Nd-Dy-Fe-B magnets[J]. J Magn Mater, 1991, 101: 417.

[11] 唐杰，刘颖，张然，等．烧结钕铁硼永磁体矫顽力理论及其影响[J]．材料导报，2006，20(4)：61．

[12] 高汝伟, 李华. 烧结NdFeB 永磁合金矫顽力机制的理论与实验研究[J]. 物理学报, 1994, 43(1) : 146.

[13] 于旭光. 烧结钕铁硼微观组织对磁性能的影响[J]. 特殊钢, 2003, 24(5):16-18.