INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Grafting of Organic Fluorine on the Surface of Flaky FeSiAl Particles and Its Microwave Absorption Property |
CHEN Liang1, CHEN Shaowen1, YUAN Zhenliang1, LI Qifan1, MA Huiru2, CHEN Zhihong3, LI Wei1,*, GUAN Jianguo1
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1 State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China 2 School of Chemistry, Chemical Engineering and Life Science, Wuhan University of Technology, Wuhan 430070, China 3 College of Science, Wuhan University of Technology, Wuhan 430070, China |
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Abstract Triethoxy-1H,1H,2H,2H-tridecafluoro-n-octylsilane (FAS) was proposed to be grafted on the surface of flaky FeSiAl absorbents by a hydroly-tic condensation method. The microstructure, coating composition, static magnetic and electromagnetic properties of flaky FeSiAl absorbents before and after surface coating were characterized. The results showed that the hydrolyzed FAS were successfully grafted on the surface of flaky FeSiAl particles to form a thin and uniform coating, and coated particles still have good soft magnetic properties. Due to the electrical insulation and low polarization properties of the coated layer, the complex permeability of flaky FeSiAl absorbents was nearly unchanged by the coating while complex permittivity was reduced by 40%, which substantially improved the impedance matching of the microwave absorbing materials.When the composite material with a mass fraction of 3% FAS and a mass fraction of absorbent filler of 76% was 3 mm thick, the absorption bandwidth whose reflection loss RL was less than -3 dB increased from 1.206 GHz (0.147—1.353 GHz) to 1.922 GHz (0.147—2.069 GHz), the minimum loss intensity increased from -14.64 dB to -16.90 dB.
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Published: 10 May 2022
Online: 2022-05-09
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Fund:National Natural Science Foundation of China (51577138). |
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