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将四针状纳米ZnO作为吸收剂、环氧树脂为粘结剂制备成吸波涂层,分析了吸波涂层中的四针状纳米氧化锌含量及涂层厚度对吸波性能的影响,当涂层厚度为1·5mm时,吸收主要集中在15—18GHz波段;当涂层厚度增加到3·5mm后,样品的吸波性能提高明显,特别在6—11GHz之间的吸波性能提高显著,样品反射率小于-5dB的频率宽度达到13·6GHz(4·4—18GHz),其吸波性能相比较微米级ZnO有显著提高.最后对四针状纳米氧化锌的吸波机理进行了讨论.所研究的涂层在电磁波屏蔽方面具有较大的应用价值.
The four acicular nano-ZnO was used as absorbent and the epoxy resin was used as the absorbing agent to prepare the absorbing coating. The influence of the content of four-needle nano-ZnO and the thickness of coating on the absorbing performance was analyzed. When the thickness of the coating is 1.5 mm, the absorption mainly concentrates in the 15-18 GHz band. When the thickness of the coating is increased to 3.5 mm, the microwave absorption performance of the sample is obviously improved, especially the absorbing performance between 6 and 11 GHz is improved Significantly, the frequency reflectivity of the sample less than -5dB reaches 13.6GHz (4. 4-18GHz), and its microwave absorbing performance is significantly higher than that of the micron-sized ZnO.Finally, the absorption mechanism of the four-needle ZnO nanowires Discussion. The studied coating has great application value in electromagnetic wave shielding.