| TAO Rui,LIU Zhao-hui,BAN Guo-dong,LUO Ping.Absorbing Properties of Carbon Fiber Absorbing Coating Matched with Air Layer[J],46(10):201-206 |
| Absorbing Properties of Carbon Fiber Absorbing Coating Matched with Air Layer |
| Received:June 28, 2017 Revised:October 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.10.029 |
| KeyWord:chopped carbon fiber absorbing coating matching thickness carbon fiber content carbon fiber length absorbing properties |
| Author | Institution |
| TAO Rui |
Department of Chemistry and Material Engineering, Logistical Engineering University, Chongqing , China |
| LIU Zhao-hui |
Department of Chemistry and Material Engineering, Logistical Engineering University, Chongqing , China |
| BAN Guo-dong |
Unit 75752 of PLA, Heyuan , China |
| LUO Ping |
Department of Chemistry and Material Engineering, Logistical Engineering University, Chongqing , China |
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| Abstract: |
| The work aims to explore the effects of matching thickness as well as content and length of carbon fiber on absorbing properties of carbon fiber absorbing coating. The radar absorbing coating was prepared with chopped carbon fiber as absorbent and waterborne polyurethane as matrix resin. Morphology of the chopped carbon fiber and the coating was analyzed and characterized by using scanning electron microscope (SEM) and metallurgical microscope. Carbon fiber coating was matched with air layer, and absorbing properties of the coating were tested by using vector network analyzer. As thickness of the air matching layer increased from 1 mm to 3.5 mm, the maximum absorption peak moved from high frequency to low frequency. As the matching thickness was 3 mm, reflectivity peak was the lowest (−41 dB). As the thickness was 2.5 mm, the effective absorption frequency (<−10 dB) was the widest (8.6～18 GHz). Maximum absorption peak frequency of the coating showed a decreasing trend as the carbon fiber content increased. When the carbon fiber content was lower than 0.1wt.%, the coating exhibited effective absorbing properties only when the carbon fiber length reached 3 mm. When the carbon fiber content was 0.1wt.%～0.2wt.%, the absorbing property was the best when the carbon fiber length was 2 mm. When the carbon fiber content was over 0.2wt.%, the coating had better absorbing properties when the carbon fiber length was 1 mm. Effective absorbing properties of carbon fiber absorbing coating matched with air layer to electromagnetic wave can be achieved in several frequency bands by adjusting matching thickness of air layer as well as content and length of carbon fiber. |
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