| YANG Ping-an,HUANG Yu-xuan,LI Rui,SUN Yang,HUANG Xin,SHOU Meng-jie,YANG Jian-jian.Optimization Design of Carbonyl Iron Powder Composite Porous Absorbing Coating[J],50(11):155-164 |
| Optimization Design of Carbonyl Iron Powder Composite Porous Absorbing Coating |
| Received:January 25, 2021 Revised:April 23, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.11.014 |
| KeyWord:microwave absorbing coating carbonyl iron powder three dimensional porous structure light weight broadband |
| Author | Institution |
| YANG Ping-an |
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing , China |
| HUANG Yu-xuan |
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing , China |
| LI Rui |
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing , China |
| SUN Yang |
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing , China |
| HUANG Xin |
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing , China |
| SHOU Meng-jie |
School of Automation, Chongqing University of Posts and Telecommunications, Chongqing , China |
| YANG Jian-jian |
Research Institute of Chemical Defence, Academy of Military Sciences, Wuhan , China |
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| Abstract: |
| In view of the defects of high density and heavy coating thickness in the absorbing coating composed of carbonyl iron powder (CIP), one of the most commonly used absorbing agents, a three-dimensional porous structure was proposed to reduce the density of the composite absorbing coating and improve the impedance mismatch, so as to construct a light and broadband carbonyl iron powder composite absorbing coating. The simulation model of carbonyl iron powder/paraffin composite porous microwave absorbing coating was established by using finite element analysis software. The effects of porosity, pore size and pore distribution on the properties (minimum reflection loss, effective absorption bandwidth, peak absorption frequency and density) of three-dimensional porous structure were studied by simulation. The wave absorbing mechanism of carbonyl iron powder porous structure was revealed, and the structural parameters of carbonyl iron powder three-dimensional porous composite microwave absorbing coating with the best comprehensive properties were determined. The results show that with the increase of porosity, the density of the coating decreases and the peak absorption frequency moves to high frequency; with the decrease of pore diameter, except for the peak absorption frequency of coating moving to high frequency, the minimum reflection loss and effective absorption bandwidth decreases and increases respectively, which can effectively improve the microwave absorption performance; in terms of pore distribution, the gradient decreasing distribution shows the best absorbing performance among the four distribution modes of random, ordered, gradient decreasing and gradient increasing. Compared with the non porous structure, the three-dimensional porous coating with 75% carbonyl iron powder, 16 vol.% porosity, 0.325 mm pore size and gradient decreasing, has a 49.3% increase in effective absorption bandwidth (RL<–10 dB), and a 4% decrease in density (from 2.71 g/cm3 to 2.6 GHz), meanwhile, the minimum reflection loss is only 0.7%. The introduction of porous structure can make the carbonyl iron powder coating light and broadband. |
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