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Enhanced high‐temperature dielectric and microwave absorption properties of SiC fiber‐reinforced oxide matrix composites
Author(s) -
Gao Hui,
Luo Fa,
Wen Qinlong,
Jia Hongyao,
Zhou Wancheng,
Zhu Dongmei
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.47097
Subject(s) - materials science , composite material , composite number , ceramic matrix composite , reflection loss , microwave , ceramic , silicon carbide , dielectric , sintering , oxide , flexural strength , dielectric loss , physics , optoelectronics , quantum mechanics , metallurgy
Because of outstanding performances of the SiC fiber‐reinforced ceramic matrix composites in aircraft/aerospace systems, two silicon carbide fiber‐reinforced oxide matrices (SiC f /oxides) composites have been prepared by a precursor infiltration and sintering method. Results indicate that the flexural strength of the SiC f /Al 2 O 3 –SiO 2 composite reaches 159 MPa, whereas that of the SiC f /Al 2 O 3 composite is only 50 MPa. The high‐temperature microwave absorption properties of the composite are significantly enhanced due to choosing Al 2 O 3 and SiO 2 as the hybrid matrices. Particularly, the minimum reflection loss (RL) value of the SiC f /Al 2 O 3 –SiO 2 composite reaches −37 dB in the temperature of 200 °C at 8.6 GHz, and the effective absorption bandwidth (RL ≤ −5 dB) is 4.2 GHz (8.2–12.4 GHz) below 400 °C. The superior microwave absorption properties at high temperatures indicate that the SiC f /Al 2 O 3 –SiO 2 composite has promising applications in civil and military areas. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47097.