1 Materials Department, No.33 Research Institute of China Electronics Technology Group, Taiyuan 030032, China 2 Production Support Engineering Department, COMAC Shanghai Aircraft Design & Research Institute, Shanghai 100029, China
In order to prepare a high-bandwidth absorbing material with both mechanical properties and electromagnetic absorption properties, a nano-particle modification and physical blending method were used to design and prepare a carbonyl iron room temperature vulcanized silicone rubber composite material based on polydimethylsiloxane. The mechanical properties and wave absorbing properties of the composite material were systematically analyzed. The results show that when the mass fraction of white carbon black is 3%, the composite material has the best comprehensive mechanical properties and is convenient for material processing; the composite material is a magnetic loss type wave absorbing material, and the attenuation constant of the material is positively correlated with the carbonyl iron content and frequency. According to simulation calculations, the absorption peak of electromagnetic waves gradually shifts to low frequency as the thickness of the composite material and the content of carbonyl iron are increased at 2-18 GHz. When the thickness of the composite material is 1.5 mm and the mass fraction of carbonyl iron is 75%, the effective absorption bandwidth of the absorbing material can reach 9.07 GHz, accounting for 56.68% of the target bandwidth. In practical applications, the formula can be optimized and the thickness of the material can be controlled according to the needs of the application scenario to achieve the best absorbing effect.
ZHAO D L , JIN L H , LUO X , et al. Preparation method and research progress of nano-ferrite based core-shell structured composite absorbing materials[J]. Journal of Jilin University (Science Edition), 2021, 59 (2): 397- 406.
GE C Q , WANG L Y , LIU G . Research progress in carbon-based/carbonyl iron composite microwave absorption materials[J]. Journal of Materials Engineering, 2019, 47 (12): 43- 54.
3
DOMMETI V S , CHERUKU D R . Multi-layer composites shielding for electromagnetic radiation protection[J]. International Journal of Advanced Intelligence Paradigms, 2020, 17 (1/2): 139.
doi: 10.1504/IJAIP.2020.108772
KONG J , GAO H , LI Y , et al. Research progress of electromagnetic shielding mechanism and lightweight and broadband wave-absorbing materials[J]. Materials Reports, 2020, 34 (5): 9055- 9063.
JING H X , LI Q L , YE Y , et al. Preparation and microwave absorbing properties of Fe(CO)5/BaTiO3composites[J]. Journal of Materials Engineering, 2015, (7): 38- 42.
6
WANG X X , ZHANG B Q , ZHANG W , et al. Super-light Cu@Ni nanowires/graphene oxide composites for significantly enhanced microwave absorption performance[J]. Scientific Reports, 2017, 7 (1): 1584.
doi: 10.1038/s41598-017-01529-2
7
WEN F S , ZHANG F , LIU Z Y . Investigation on microwave absorption properties for multiwalled carbon nanotubes/Fe/Co/Ni nanopowders as lightweight absorbers[J]. The Journal of Physical Chemistry C, 2011, 115 (29): 14025- 14030.
doi: 10.1021/jp202078p
YAN J X , WU J H , SHI J Y , et al. Research progress of radar absorbing coating materials[J]. Surface Technology, 2020, 49 (5): 166- 180.
9
LI J , FENG W J , WANG J S , et al. Impact of silica-coating on the microwave absorption properties of carbonyl iron powder[J]. Journal of Magnetism and Magnetic Materials, 2015, 393, 82- 87.
doi: 10.1016/j.jmmm.2015.05.049
10
KHANI O , SHOUSHTARI M Z , ACKLAND K , et al. The structural, magnetic and microwave properties of spherical and flake shaped carbonyl iron particles as thin multilayer microwave absorbers[J]. Journal of Magnetism and Magnetic Materials, 2017, 428, 28- 35.
doi: 10.1016/j.jmmm.2016.12.010
11
XU Y G , YUAN L M , WANG X B , et al. Two-step milling on the carbonyl iron particles and optimizing on the composite absorption[J]. Journal of Alloys and Compounds, 2016, 676, 251- 259.
doi: 10.1016/j.jallcom.2016.03.192
12
ZHOU Y Y , HUI X , ZHOU W C , et al. Enhanced antioxidation and microwave absorbing properties of SiO2-coated flaky carbonyl iron particles[J]. Journal of Magnetism and Magnetic Materials, 2018, 446, 143- 146.
doi: 10.1016/j.jmmm.2017.09.022
13
JAFARIAN M , AFGHAHI S S S , ATASSI Y , et al. Enhanced microwave absorption characteristics of nanocomposite based on hollow carbonyl iron microspheres and polyaniline decorated with MWCNTs[J]. Journal of Magnetism and Magnetic Materials, 2018, 462, 153- 159.
doi: 10.1016/j.jmmm.2018.04.061
14
DUAN Y P , LIU Y , CUI Y L , et al. Graphene to tune microwave absorption frequencies and enhance absorption properties of carbonyl iron/polyurethane coating[J]. Progress in Organic Coatings, 2018, 125, 89- 98.
doi: 10.1016/j.porgcoat.2018.08.030
HUANG Q H , ZHANG B S , TANG D M , et al. Synthesis and characteristics of graphene-Fe@Fe3O4 nano-composites materials[J]. Chinese Journal of Inorganic Chemistry, 2012, 28 (10): 2077- 2082.
16
HE L L , ZHAO Y , XING L Y , et al. Preparation of reduced graphene oxide coated flaky carbonyl iron composites and their excellent microwave absorption properties[J]. RSC Advance, 2018, 8, 2971- 2977.
doi: 10.1039/C7RA12984J
LI Z , ZHAO F , WANG J J , et al. Preparation and low frequency absorbing mechanism of PVP surface modified carbonyl iron/ CoFe2O4 core-shell nanostructure[J]. Materials Reports, 2020, 34 (7): 14027- 14033.
18
FOSTER K , LITTMANN M F . Factors affecting core losses in oriented electrical steels at moderate inductions (invited)[J]. Journal of Applied Physics, 1985, 57 (1): 4203- 4208.
19
MICHIELSSEN E , SAJER J M , RANJITHAN S , et al. Design of lightweight, broad-band microwave absorbers using genetic algorithms[J]. IEEE Transactions on Microwave Theory and Techniques, 1993, 41 (6): 1024- 1031.
doi: 10.1109/22.238519