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碳纳米管通过化学气相沉积工艺制备,碳纳米管直径10～30nm,纯度>90%。碳源为乙炔、铁/镍复合催化剂。加入适量的有机溶剂丙酮溶解环氧树脂,然后加入碳纳米管。分别高速搅拌和超声处理30min,加入固化剂乙二胺搅拌均匀,超声10min除去气体后,浇铸在铝板上制成吸波涂层。TEM检测碳纳米管。反射率扫频测量系统HP8757E标量网络分析仪检测吸波性能。碳纳米管和环氧树脂比例为1∶100时,3mm厚吸波层试样吸波峰出现在14 32GHz,吸波峰值R=-10 01dB,吸波频带宽度为2 16GHz(R<8dB)。厚度增加到9mm,在11GHz和17 83GHz出现双吸波峰,最大吸波峰出现在17 83GHz峰值R=-9 04dB,带宽约1GHz(R<8dB)。比例调整为5∶100时,波峰出现在7 91GHz,峰值加大到R=-13 89dB,带宽度达到3 19GHz(R<8dB)。
The carbon nanotubes are prepared by a chemical vapor deposition process. The carbon nanotubes have a diameter of 10-30 nm and a purity of> 90%. Carbon source for acetylene, iron / nickel composite catalyst. Add an appropriate amount of organic solvent acetone to dissolve the epoxy resin, then add carbon nanotubes. Respectively, high-speed stirring and ultrasonic treatment 30min, adding curing agent ethylenediamine stir, ultrasonic 10min to remove the gas, cast aluminum plate made of absorbing coating. TEM detection of carbon nanotubes. Reflectance sweep measurement system HP8757E scalar network analyzer detects the absorbing performance. When the ratio of carbon nanotubes to epoxy resin is 1: 100, the absorption peak of the 3mm thick absorber layer appears at 1432GHz, the absorption peak is R = -10 01dB and the absorption bandwidth is 2 16GHz (R <8dB). The thickness increased to 9 mm with double absorption peaks at 11 GHz and 17 83 GHz. The maximum absorption peak appeared at 17 83 GHz peak R = -9 04 dB with a bandwidth of about 1 GHz (R <8 dB). When the ratio is adjusted to 5:100, the peak appears at 7 91 GHz, the peak increases to R = -1389 dB, and the bandwidth reaches 3 19 GHz (R <8 dB).