TY - JOUR
T1 - Self-standing and compressible SiCnw/SiCnf composite aerogel via free carbon in-situ transformation mechanism
T2 - Towards thermal and electromagnetic wave protection
AU - Wang, Tiansheng
AU - Feng, Menghang
AU - Xiang, Zichen
AU - Song, Zhi
AU - Lv, Hualiang
AU - Hou, Yi
AU - Wang, Lixi
AU - Zhang, Qitu
N1 - Publisher Copyright:
© 2024
PY - 2024/6/15
Y1 - 2024/6/15
N2 - SiC nanofiber-based composite aerogel represents a promising lightweight, high-temperature-resistant, and broadband-absorbing material. However, the residual carbon phase during the pyrolysis process would threaten the high-temperature oxidation tolerance. Herein, a free carbon in-situ transformation (FCIT) strategy was proposed to convert the amorphous free carbon on the surface of SiC nanofibers into SiC nanowires, constructing a multi-scale SiC nanowire/SiC nanofiber (SiCnw/SiCnf) composite aerogel. The SiCnw great broaden the inner fibrous framework, and the hierarchical network offers great enhancement for EM attenuation, compression resistance and thermal insulation. The self-standing composite aerogel possesses excellent flexibility (1500 cycles in 180°-bending test) and compression resistance (100 cycles at 40 % strain). With only 10 wt% filler content, the SiCnw/SiCnf sample displays an effective absorption bandwidth (EAB) of 8.81 GHz (9.19–18.00 GHz) at a thickness of 2.94 mm. Even after enduring oxidation at 800 °C, the EAB still remains substantial at 6.92 GHz (11.08–18.00 GHz). Moreover, the outstanding mechanical performance were also retained under high temperature and oxidation environment due the reduced density and thermal conductivity. Therefore, the multifunctional SiCnw/SiCnf composite aerogel prepared by FCIT strategy could be served as efficient thermal and EMW protection candidate.
AB - SiC nanofiber-based composite aerogel represents a promising lightweight, high-temperature-resistant, and broadband-absorbing material. However, the residual carbon phase during the pyrolysis process would threaten the high-temperature oxidation tolerance. Herein, a free carbon in-situ transformation (FCIT) strategy was proposed to convert the amorphous free carbon on the surface of SiC nanofibers into SiC nanowires, constructing a multi-scale SiC nanowire/SiC nanofiber (SiCnw/SiCnf) composite aerogel. The SiCnw great broaden the inner fibrous framework, and the hierarchical network offers great enhancement for EM attenuation, compression resistance and thermal insulation. The self-standing composite aerogel possesses excellent flexibility (1500 cycles in 180°-bending test) and compression resistance (100 cycles at 40 % strain). With only 10 wt% filler content, the SiCnw/SiCnf sample displays an effective absorption bandwidth (EAB) of 8.81 GHz (9.19–18.00 GHz) at a thickness of 2.94 mm. Even after enduring oxidation at 800 °C, the EAB still remains substantial at 6.92 GHz (11.08–18.00 GHz). Moreover, the outstanding mechanical performance were also retained under high temperature and oxidation environment due the reduced density and thermal conductivity. Therefore, the multifunctional SiCnw/SiCnf composite aerogel prepared by FCIT strategy could be served as efficient thermal and EMW protection candidate.
KW - Compression resistance
KW - Flexibility
KW - Free carbon in-situ transformation
KW - Self-standing
KW - SiC/SiC composite aerogel
KW - Thermal and electromagnetic wave protection
UR - http://www.scopus.com/inward/record.url?scp=85190749298&partnerID=8YFLogxK
U2 - 10.1016/j.compositesb.2024.111454
DO - 10.1016/j.compositesb.2024.111454
M3 - 文章
AN - SCOPUS:85190749298
SN - 1359-8368
VL - 279
JO - Composites Part B: Engineering
JF - Composites Part B: Engineering
M1 - 111454
ER -