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| Mechanism and Controlling Method for Appearance Failure of Radar Absorbing Composites |
| Received:October 17, 2022 Revised:February 04, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2023.07.022 |
| KeyWord:radar absorbing composites multi-layer foam sandwich structure change of heat expansion appearance failure natural environmental test environmental adaptability |
| Author | Institution |
| ZHANG Tian-cai |
Southwest Institute of Technology and Engineering, Chongqing , China |
| LI Xi |
Southwest Institute of Technology and Engineering, Chongqing , China |
| SUN Yu-nan |
AVIC Haerbin Aircraft Industry Group, Co., Ltd., Haerbin , China |
| JIANG He-yue |
The Sixth Military Representative Office of the Army Equipment Department in Chongqing, Chongqing , China |
| LONG Pei |
The Sixth Military Representative Office of the Army Equipment Department in Chongqing, Chongqing , China |
| A Wang-dan-zeng |
Southwest Institute of Technology and Engineering, Chongqing , China |
| WANG Zhen-hai |
Southwest Institute of Technology and Engineering, Chongqing , China |
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| Abstract: |
| The work aims to solve the appearance failure of radar absorbing composites with multi-layer foam sandwich structure under environmental effect. Three types of radar absorbing composites were prepared and tested in the typical natural environment. The appearance of the test sample was observed and the deformation was detected. By observing the microstructure morphology of the foam, the change of heat expansion and the adhesive strength between the foam and the resin was detected. A GCMS was used to detect the fracturing gas composition of the composites, and the causes for appearance failure of the composites and the technical solutions were analyzed. After 6 months of natural environment test, the appearance of 1# and 2# samples failed, while that of 3# samples did not change significantly. The composition of the fracturing gas at 100 ℃ was nitrogen, dichlorofluoroethane and dimethyl methylphosphonate. At 22-85 ℃, the maximum heat expansion of the four foams was –0.18%, –0.37%, –0.30% and –0.45%, respectively. The adhesive strength of epoxy resin to four foams was 41-52 N, while that of polyurethane resin was 54-81 N. Residual gas release in the pores of radar absorbing composites is the root cause of appearance failure. It is an effective technical way to improve the environmental adaptability of composites by reducing the amount of residual gas in samples and improving the adhesive strength between adhesives and foams by heat treatment. |
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