Recycle of rare earth sintered magnet powder scraps as electromagnetic wave absorbers in gigahertz range
Recycle of rare earth sintered magnet powder scraps as electromagnetic wave absorbers in gigahertz range
复制标题
DOI：
10.1016/j.jallcom.2007.04.093
复制
发表时间：
2008-02
影响因子：
6.2
通讯作者：
M. Itoh;K. Nishiyama;Fumiyoshi Shogano;T. Murota;Kazuhiko Yamamoto;M. Sasada;K. Machida
中科院分区：
文献类型：
--
作者：
M. Itoh;K. Nishiyama;Fumiyoshi Shogano;T. Murota;Kazuhiko Yamamoto;M. Sasada;K. Machida
以烧结钕铁硼磁体污泥粉回收过程中副产的磁铁矿粉为原料，制备了电磁波吸收剂。由此产生的电磁波吸收体在16.5GHz下显示出-32dB的最小RL值，厚度为1.2mm。由于导磁率的增加，磁铁矿粉末的减少导致电磁波吸收性能的改善（RL<-20dB，范围：9- 18 GHz，厚度：2-1.1mm）。上述电磁波吸收器堆叠有电介质类型和碳电阻器，由于磁阻和电阻的双重损失，可以拓宽吸收范围（4- 15 GHz，RL<-10dB）。
The electromagnetic (EM) wave absorbers were prepared from the magnetite powders obtained as a byproduct in the recycle process for the sludge powder scraps of NdFeB-type sintered magnets. The resulting EM wave absorbers showed the minimum RL value of −32dB at 16.5GHz with 1.2mm thickness. Reduction of the magnetite powders leads to improve the EM wave absorption properties (RL<−20dB, range: 9–18GHz, thickness: 2–1.1mm) due to the increase of permeability. The above EM wave absorber stacked with a dielectric type one and carbon resistor could broaden an absorption range (4–15GHz, RL<−10dB) owing to the dual magnetic and electrical resistance loss.