中文摘要：

采用熔炼、高能球磨、微氧化热处理工艺，制备RE（Nd，Tb）FeCoB粉体，借助x射线衍射仪和网络矢量分析仪等，研究不同B含量的NdFeCo粉体组织结构和微波吸收特性，以及用重稀土Tb取代NdFeCoB合金中的Nd后粉体的组织结构和微波吸收特性。结果发现：在Nd10．53Fe77．84Co11.63合金中加入B元素后会析出Nd2Fe14B相，而且，粉体中α-Fe相的相对含量随着B元素含量的增加而增加；用重稀土Tb取代NdFeCoB合金中的Nd后粉体主要由α-Fe、Tb2Fe14B、Tb2Fe17以及少量的Tb2O3相组成：CNd10．53Fe77．84Co11.63）9783粉体具有最低的吸收峰频率，其反射率最小值和吸收峰频率分别为-9．5dB和4．5GHZ;用重稀土Tb取代（Nd10．53Fe77．84Co11.63）9783合金中的Nd后，粉体的吸收峰频率升高到6-3GHz，但反射率最小值降低到-l1dB。

英文摘要：

The RE（Nd, Tb）FeCoB magnetic powders were prepared by arc melting, high energy ball milling and a partial oxidation treatment method. A X-ray diffraction device and a vector network analyzer were used to analyze the phase structure and microwave absorbing properties of the powders. The results of B addition to the microwave absorbing performances in the NdFeCo alloy, indicate that NdEFel4B phase will precipitate and the relative content of the α-Fe phase increases with the increasing of B in Nd10.53Fe77.84Co11.63 alloy powder. When Nd is replaced by the heavy rare earth Tb in NdFeCoB alloy, the powders consist of α-Fe, Tb2Fe14B, Tb2Fe17 and a small amount of Tb203 phases. （Nd10.53Fe77.84CO11.63）97B3 powder has a minimum of absorption peak frequency, which is -9.5 dB at 4.5 GHz. After substituting Tb for Nb in （Ndx0.53Fe77.84CO11.63）97B3 alloy the absorption peak frequency increases to 6.3 GHz, but the reflectivity value is reduced to -1 1 dB.