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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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.

Electromagnetic wave absorptionSiC nanowiresFlexural strengthCeramic matrix composite

Yuntian Fan、Dou Yang、Hui Mei

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Science and Technology on Thermostructural Composite Materials Laboratory, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, China

2022

Journal of Alloys and Compounds

Journal of Alloys and Compounds

EISCI
ISSN:0925-8388
年,卷(期):2022.896
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