片状Nd1Ni5-xCx合金粉的电磁和微波吸收特性

Electromagnetic and Microwave Absorption Properties of Flake NdNiC Alloy Powders

利用电弧熔炼和行星球磨技术制备出片状Nd1Ni5-xCx(x=0.0,0.1,0.3,0.5)合金粉。利用X射线衍射仪(XRD)、扫描电镜(SEM)、振动样品磁强计(VSM)、矢量网络分析仪(VNA)等仪器对其结构、形貌和电磁特性进行检测。结果表明,随着C含量的增加,粉体的饱和磁化强度和矫顽力逐渐减小,并且反射损耗的吸收峰向高频移动。在C添加量为x=0.5时出现2个有效带宽,分别为8.28~9.82GHz和11.17~12.03GHz,有效改善了粉体的吸收带宽。另外,随着粉体厚度的变化,反射损耗可以在较大的频段内进行调整。可见该粉体有着广泛的应用前景。

Flake Nd1 Ni5-xCx(x=0.0, 0.1, 0.3, 0.5) alloy powders were prepared by arc smelting and planetary grinding. X-ray diffractometer(XRD), scanning electron microscopy(SEM), vibrating sample magnetometer(VSM), vector network analyzer(VNA) etc were used to detect the structure, morphology and electromagnetic characteristics. The results show that with the increase of C content, Ms and Hc of the sample tend to decrease. The absorption peak of electromagnetic wave moves to high-frequency, and two effective bandwidths(RL≤-10 dB) at 8.28~9.82 and 11.17~12.03 GHz appear when the additive amount of C is x=0.5, which increase the applicable frequency band of the powder. In addition, with the change of the powders thickness, the frequency band with great impedance matching changes greatly, so the reflection loss can be adjusted in the larger frequency band. These changes make the powders have the possibility of wide application.