首页|(163017)Tuning SiC nanowires interphase to improve the mechanical and lectromagnetic wave absorption properties of SiC_f/SiC_(nw)/Si_3N_4 composites
(163017)Tuning SiC nanowires interphase to improve the mechanical and lectromagnetic wave absorption properties of SiC_f/SiC_(nw)/Si_3N_4 composites
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NSTL
Elsevier
The interphase of composites is a vital element in controlling the overall performance. Herein, the SiC nanowires (SiC_(nw)) were grown on the interface of the SiC fiber (SiC_f)/Si_3N_4 composites and successfully achieved the integration of enhanced mechanical and electromagnetic wave (EMW) absorption performance. The introduction of SiC_(nw) made the bonding between the SiCf and Si_3N_4 matrix more appropriate, thereby enhancing the mechanical properties. The defects, stacking faults, twin boundaries and heterogeneous interfaces in SiC_(nw) improved the dielectric loss of the composites, which was beneficial to the consumption of EMW energy. Notably, the SiCf/SiC_(nw)/Si_3N_4 composite containing 1.8 vol% SiC_(nw) demonstrated the optimal mechanical and EMW absorption properties, reaching a flexural strength of 333 ± 29 MPa, a minimum reflection coefficient (RC_(min)) value of- 51.4 dB with a thickness of 3.2 mm and an effective absorption bandwidth (EAB) of 3.5 GHz with a thickness of 2.8 mm. Besides, the fracture mechanism and EMW absorption mechanism are also discussed. This work provides a potential new way to prepare lightweight, stable, and high-performance EMW absorbing materials for aviation and aerospace.
Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China