Si含量对NdFe材料微波吸收特性的影响

Effect of Si Contents on Microwave Absorbing Properties of NdFe Materials

摘要:

采用高能球磨和晶化热处理方法制备钕铁吸波粉体，研究Si含量对钕铁粉体吸波性能的影响。结果发现：在高能球磨和微氧化气氛下进行700 ℃，1 h晶化处理后，Nd8Fe92、Nd8Fe89Si3和Nd8Fe87S5粉体组织均由α-Fe、Nd2O3和Fe17Nd2相组成，加入Si后，粉体的Fe17Nd2相对量增加；Nd8Fe92粉体的反射率最小值约为–4.5 dB，吸收峰频率约为4.4 GHz，加入Si后，粉体的反射率最小值降低, 吸收峰频率升高, 吸波带宽变宽；Nd8Fe92粉体以介电损耗为主，Nd8Fe89Si3和Nd8Fe87Si5粉体以磁损耗为主

Abstract:

The NdFe absorbing powder was prepared by high-energy ball-milling and crystallization heat treatment. The influence of Si contents on the absorbing properties of NdFe powder was investigated. The result shows that the microstructures of Nd8Fe92, Nd8Fe89Si3 and Nd8Fe87Si5 powders consist of α-Fe, Nd2O3 and Fe17Nd2 phase after high-energy milling and 700 ℃, 1 h crystallization heat treatment in a micro-oxidation atmosphere. The relative amount of Fe17Nd2 phase increases after adding Si. The minimum reflectance of Nd8Fe92 powder is -4.5 dB, the frequency of the absorption peak is 4.4 GHz. After adding Si the minimum reflectance of powder decreases, while the frequency of the absorption peak increases and the absorption band of NdFe powder is widened. Nd8Fe92 powder takes dielectric loss, as main loss, while Nd8Fe89Si3 and Nd8Fe87Si5 powder take magnetic loss as main loss