The waste sintered Nd-Fe-B magnets were regenerated as magnetic powders via manually crushing (MC) or hydrogen de-crepitation (HD) to fabricate anisotropic bonded magnets. Effect of size distribution on the magnetic properties of the regenerated magnetic MC and HD powders was investigated. For the MC powders, as the particle size decreased, the remanence (Br) increased first, and then decreased again, while the coercivity (Hci) dropped monotonically. The powders with particle size in the range of 200–450μm possessed the best magnetic properties ofBr of 1.22 T andHci of 875.6 kA/m. The corresponding bonded magnet exhibited magnetic properties ofBr of 0.838 T,Hci of 940.9 kA/m, and (BH)max of 91.4 kJ/m3, respectively. On the other hand, the HD powders with particle size range of 200-450μm bore the best magnetic properties ofBr of 1.24 T andHci of 860.4 kA/m. Compared with magnetic proper-ties of the waste magnet, the powders retained 93.9% ofBr and 70.0% ofHci, respectively. The bonded magnet produced from HD powders possessedBr of 0.9 T,Hci of 841.4 kA/m, and (BH)max of 111.6 kJ/m3, indicating its good potential in practical applications.
参考文献
| [1] | Ali A;Ahmad A;Deen K M .Multilayer ceramic coating for impeding corrosion of sintered NdFeB magnets[J].Journal of Rare Earths,2009,27:1003. |
| [2] | 李岩峰,朱明刚,李安华,冯海波,黄书林,李卫,杜安,齐岩.Relationship between controllable preparation and microstructure of NdFeB sintered magnets[J].稀土学报（英文版）,2014(07):628-632. |
| [3] | Liu W Q;Sun C;Yue M;Sun H Zhang D T Zhang J X Yi X F Chen J W .Improvement of coercivity and cor-rosion resistance of Nd-Fe-B sintered magnets by dop-ing aluminium nano-particles[J].Journal of Rare Earths,2013,31:65. |
| [4] | 董雪亮,王德仁,曾阳庆.Effect of mechanical attrition on microstructure and properties of electro-deposition coatings on NdFeB[J].稀土学报（英文版）,2014(09):867-873. |
| [5] | 付新,韩小磊,杜志伟,冯海波,李岩峰.Microstructural investigation of Nd-rich phase in sintered Nd-Fe-B magnets through electron microscopy[J].稀土学报（英文版）,2013(08):765-771. |
| [6] | Gutfleisch O;Willard M A;Brück E;Chen C H Sankar S G Liu J P .Magnetic materials and devices for the 21st century:stronger,lighter,and more energy efficient[J].Advanced Materials,2011,23:821. |
| [7] | Miura K;Itoh M;Machida K I .Extraction and recovery characteristics of Fe element from Nd-Fe-B sintered mag-net powder scrap by carbonylation[J].Journal of Alloys and Compounds,2008,466:228. |
| [8] | Zakotnik M;Harris I R;Williams A J .Possible methods of recycling NdFeB-type sintered magnets using the HD/degassing process[J].Journal of Alloys and Compounds,2008,450:525. |
| [9] | Zakotnik M;Harris I R;Williams A J .Multiple recycling of NdFeB-type sintered magnets[J].Journal of Alloys and Compounds,2009,469:314. |
| [10] | Zakotnik M;Devlin E;Harris I R;Williams A J.Hydrogen decrepitation and recycling of NdFeB-type sintered mag-nets[A].北京,2006:289. |
| [11] | Périgo E A;De Silva S C;Martin R V;Takiishi H Land-graf F J G .Properties of hydrogenation-disproportionation-desorption-recombination NdFeB powders prepared from recycled sintered magnets[J].Journal of Applied Physics,2012,111:07A725. |
| [12] | Sheridan, R.S.;Sillitoe, R.;Zakotnik, M.;Harris, I.R.;Williams, A.J. .Anisotropic powder from sintered NdFeB magnets by the HDDR processing route[J].Journal of Magnetism and Magnetic Materials,2012(1):63-67. |
| [13] | Gutfleisch O;Güth K;Woodcock T G;Schultz L .Recycling used Nd-Fe-B sintered magnets via a hydrogen-based route to produce anisotropic,resin bonded magnets[J].Adv Energy Mater,2013,3:151. |
| [14] | LUO Jianjun,De Rango P,Fruchart D,MEI Jinna,HU Rui,LI Jinshan,ZHOU Lian.Hydrogen absorption of NdDyFeCoNbCuB sintered magnets[J].稀土学报（英文版）,2009(03):520-524. |
| [15] | Zhao H F;Liu H M;Su J Y .Influence of heat treatment on microstructures and properties of Nd8Fe78B6Co4 alloy[J].Journal of Rare Earths,2006,24:379. |
| [16] | Itoh M;Masuda M;Suzuki S;Machida K I .Recycle for sludge scrap of Nd-Fe-B sintered magnet as isotropic bonded magnet[J].Journal of Rare Earths,2004,22:168. |
| [17] | 孙爱芝,李智伟,韩景智,李涛,张正义,肖耀福.Investigation on the Moldability of HDDR NdFeB Bonded Magnet Prepared by Compression Molding Method[J].稀土学报(英文版),2003(02):129-131. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%