Absorbing Property of Multi-layered Short Carbon Fiber Absorbing Coating

Abstract

The radar absorbing coating was prepared with short carbon fiber as absorbent and waterborne polyurethane (WPU) as matrix resin. The coating’s absorbing property was tested with vector network analyzer, using aramid honeycomb as air layer which was matched with carbon fiber coating. The results demonstrate that the single-layered carbon fiber absorbing coating presented relatively poor absorbing property when the layer was thin, and the performance was slightly improved after the matched air layer was adopted. Then the multi-layered carbon fiber absorbing coating was produced by matching the air layer with absorbing coating of varied carbon fiber content. Consequently, the absorption intensity and the band width of effective absorption were significantly enhanced. According to varied matching methods between carbon fiber coating and air layer, the composite coating’s reflectivity reached a minimum of -23dB, and the reflectivity was less than -10dB within the range of 4-13GHz, the band width of effective absorption reached 9GHz.

Keywords

• short carbon fiber,absorbing coating,multi-layered,absorbing property

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