论文部分内容阅读
采用高能球磨和晶化热处理方法制备钕铁硼吸波粉体,研究制备工艺对钕铁硼粉体吸波性能的影响。结果发现:高能球磨和适当晶化热处理可改善NdFeB粉体的组织结构、复介电常数和复磁导率;NdFeB粉体的反射率最小值为-15.5 dB,高能球磨48 h后粉体的反射率最小值降到-23 dB,高能球磨粉体经600℃晶化热处理后反射率最小值为-19 dB;高能球磨和晶化热处理可降低NdFeB粉体的吸收峰频率;高能球磨会使NdFeB粉体的吸波带宽变窄,经600℃晶化热处理后吸波带宽变宽,并且随着晶化热处理的温度升高,吸波带宽变得更宽。
NdFeB powder was prepared by high-energy ball milling and crystallization heat treatment, and the influence of preparation process on absorbing performance of NdFeB powder was studied. The results show that high-energy ball milling and proper heat treatment can improve the microstructure, complex permittivity and complex permeability of NdFeB powders. The minimum reflectivity of NdFeB powders is -15.5 dB. After 48 h of high-energy ball milling, The minimum value of reflectivity dropped to -23 dB. The minimum reflectance of high-energy ball mill powder after heat treatment at 600 ℃ was -19 dB. High-energy ball milling and heat treatment could reduce the absorption peak frequency of NdFeB powder. The absorption bandwidth of NdFeB powder becomes narrower, the absorption bandwidth becomes wider after the heat treatment at 600 ℃, and the absorption bandwidth becomes wider as the temperature of crystallization heat treatment increases.