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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℃,1h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-4.5dB,吸收峰频率约为4.4GHz,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。
The NdFeB powders were prepared by high energy ball milling and crystallization heat treatment, and the effect of Si content on the absorbing properties of NdFeB powders was studied. The results show that the microstructures of Nd8Fe92, Nd8Fe89Si3 and Nd8Fe87S5 powders are all composed of α-Fe, Nd2O3 and Fe17Nd2 phases after 700 ℃ and 1h crystallization in high-energy ball milling and micro-oxidation atmosphere. After adding Si, The minimum reflectance of Nd8Fe92 powder is about -4.5dB and the absorption peak frequency is about 4.4GHz. After adding Si, the minimum reflectance of powder decreases, the absorption peak frequency increases, and the absorption bandwidth broadens. The dielectric loss of Nd8Fe92 powder is the major one, and the Nd8Fe89Si3 and Nd8Fe87Si5 powders are mainly magnetic loss.