Constructing hierarchical Ti3SiC2 layer and carbon nanotubes on SiC fibers for enhanced electromagnetic wave absorption |
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Affiliation: | 1. State Key Laboratory of Powder Metallurgy, Powder Metallurgy Research Institute, Central South University, 410083, Changsha, PR China;2. Hunan Key Laboratory of Advanced Fibers and Composites, Central South University, Changsha, Hunan, 410083, PR China;3. Cerema, Research Team ENDSUM, 23 avenue de l’Amiral Chauvin, 49136, Les Ponts de Cé, France |
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Abstract: | To enhance the absorption performance of silicon carbide fiber (SiCf), hybrid fibers with a double shell structure (Ti3SiC2 and carbon nanotubes (CNTs)) on the SiCf (CNT@Ti3SiC2@SiCf) were successfully synthesized by the combination of molten salt method and floating catalytic chemical vapor deposition. A series of 10% weight fraction fibers reinforced paraffin samples was prepared to study the double coating influences on the electromagnetic wave (EMW) absorption performances. Coated by Ti3SiC2 and CNTs, the dielectric permittivity of hybrid fibers could be modulated in a quite wide range. The CNT@Ti3SiC2@SiCf with a thickness of 3.8 mm showed a minimum reflection loss value of ?53 dB at 6.57 GHz, and the CNT@Ti3SiC2@SiCf with a thickness of 2.5 mm presented a wide effective absorption bandwidth of 5.6 GHz (from 9 to 14.6 GHz). The highly improved EMW absorption performance of CNT@Ti3SiC2@SiCf was attributed to the combination of conductive loss and dielectric loss aroused by interfaces. The excellent absorption performance provided the modified SiCf with a high potential in the application of EMW absorbers. |
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Keywords: | MAX phase EMW absorption CNTs |
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