Nd-Fe-C合金的结构及其微波吸收特性研究

Structure and Microwave Absorption Properties of Nd-Fe-C Alloys

摘要:

采用电弧熔炼及球磨工艺制备出Nd10.2Fe89.8-xCx (x = 0.0, 2.6, 5.2, 7.8) 合金微粉，借助XRD、SEM和网络矢量分析仪等仪器分别对合金微粉的结构、形貌及其微波吸收性能进行了研究。研究发现, 随着C含量的增加，Nd10.2Fe89.8-xCx合金的最小反射峰频率高频方向移动；其中Nd10.2Fe84.6C5.2合金具有最好的吸波效果，在最佳匹配厚度1.8 mm下，Nd10.2Fe84.6C5.2合金的最小反射损耗在5.2 GHz处达到-13.2 dB左右，反射损耗小于-10 dB的频带宽度达到了1.2 GHz。随着匹配厚度的增加最小反射损耗向低频移动，最小反射损耗与干涉损耗有关。

Abstract:

Nd10.2Fe89.8-xCx (x = 0.0, 2.6, 5.2, 7.8) powder were prepared by arc smelting and ball milling. The structure and morphology of the powder were investigated by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The electromagnetic parameters of the powders were measured by vector network analyzer (VNA) at room temperature. Microwave absorbing properties of Nd10.2Fe89.8-xCx (x = 0.0, 2.6, 5.2, 7.8) depend sensitively on the compositions. The minimum absorption peak frequency shifts to the higher region upon the C content. The minimum reflectivity value of Nd10.2Fe84.6C5.2 can achieve to -13.2 dB at 5.2 GHz and the bandwidth of R < -10 dB achieve 1.2 GHz with the best matching thickness of 1.8 mm. The minimum absorption peak shifts towards lower frequency region with absorbing coating thickness increasing.