采用晶界添加MgF2制备烧结NdFeB磁体,通过扫描电镜、透射电镜和性能测试,研究了烧结NdFeB磁体的微观组织及其对磁性能、电阻率的提高和耐腐蚀性能的影响.结果表明:添加适量MgF2可实现在磁体剩磁、矫顽力和电阻率提高的基础上,同时提高材料的腐蚀电位,并且在极化曲线的阳极部分相同电位条件下,具有较小的极化电流密度,从而达到改善NdFeB磁体耐腐蚀性能的目的.磁体显微组织研究表明F元素进入晶界相,形成F含量约为30％(原子分数)、以面心立方为基的有序的NdOxFy相,其与磁性能、电阻率的提高和耐腐蚀性能改善有关.
参考文献
| [1] | Matsuura Y .Recent development of Nd-Fe-B sintered magnets and their applications[J].Journal of Magnetism and Magnetic Materials,2006(2):344-347. |
| [2] | Liu W Q;Sun H;Yi X F;Liu X C Zhang D T Yue M Zhang J X .Coercivity enhancement in Nd-Fe-B sintered permanent magnet by Dy nanoparticles doping[J].Journal of Alloys and Compounds,2010,501:67. |
| [3] | 孙绪新,包小倩,高学绪,张茂才,董清飞,周寿增.烧结Nd-Fe-B磁体表面渗镀Dy2O3对磁体显微组织和磁性能的影响[J].中国稀土学报,2009(01):86-91. |
| [4] | Schultz L;Ei-aziz A M;Barkleit G;Mumment K .Corrosion behaviour of Nd-Fe-B permanent magnetic alloys[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,1999,A267(02):307. |
| [5] | Yu LQ;Wen YH;Yan M .Effects of Dy and Nb on the magnetic properties and corrosion resistance of sintered NdFeB[J].Journal of Magnetism and Magnetic Materials,2004(2/3):353-356. |
| [6] | Jiang J H.The effect of Co addition on the fracture strength of NdFeB sintered magnets[J].Intermetallics,2001(09):269. |
| [7] | Mo W J;Zhang L T;Shan A D;Cao L J .Improvement of magnetic properties and corrosion resistance of NdFeB magnets by intergranular addition of MgO[J].Journal of Alloys and Compounds,2008,461(02):351. |
| [8] | Cui, XG;Yan, M;Ma, TY;Luo, W;Tu, SJ .Effect of SiO2 nanopowders on magnetic properties and corrosion resistance of sintered Nd-Fe-B magnets[J].Journal of Magnetism and Magnetic Materials,2009(5):392-395. |
| [9] | 涂少军,严密,崔熙贵,倪俊杰,金一彪.AlN纳米粉晶界添加对烧结Nd-Fe-B磁体耐腐蚀性能的影响[J].稀有金属材料与工程,2010(10):1777-1780. |
| [10] | T. Fukagawa;S. Hirosawa;T. Ohkubo;K. Hono .The effect of oxygen on the surface coercivity of Nd-coated Nd-Fe-B sintered magnets[J].Journal of Applied Physics,2009(7):07A724-1-07A724-3-0. |
| [11] | Tomoki Fukagawa;Satoshi Hirosawa .Influence of Nd/Nd_2Fe_(14B interface microstructure on the coercivity of surface Nd_2Fe_(14)B grains in Nd-sputtered Nd-Fe-B sintered magnets[J].Scripta materialia,2008(2):183-186. |
| [12] | Qiongzhen Liu;Lanting Zhang;Xianping Dong .Increased coercivity in sintered Nd-Fe-B magnets with NdF_3 additions and the related grain boundary phase[J].Scripta materialia,2009(11):1048-1051. |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%