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- Title
Enhanced high‐temperature dielectric and microwave absorption properties of SiC fiber‐reinforced oxide matrix composites.
- Authors
Gao, Hui; Luo, Fa; Wen, Qinlong; Jia, Hongyao; Zhou, Wancheng; Zhu, Dongmei
- Abstract
Because of outstanding performances of the SiC fiber‐reinforced ceramic matrix composites in aircraft/aerospace systems, two silicon carbide fiber‐reinforced oxide matrices (SiCf/oxides) composites have been prepared by a precursor infiltration and sintering method. Results indicate that the flexural strength of the SiCf/Al2O3–SiO2 composite reaches 159 MPa, whereas that of the SiCf/Al2O3 composite is only 50 MPa. The high‐temperature microwave absorption properties of the composite are significantly enhanced due to choosing Al2O3 and SiO2 as the hybrid matrices. Particularly, the minimum reflection loss (RL) value of the SiCf/Al2O3–SiO2 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 SiCf/Al2O3–SiO2 composite has promising applications in civil and military areas. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47097. The purpose of this work is to enhance high‐temperature dielectric and microwave absorbing properties of SiC fiber‐reinforced oxide matrix composites. The minimum reflection loss values of the SiCf/Al2O3–SiO2 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) at 400 °C.
- Subjects
DIELECTRIC materials; SILICON carbide fibers; SINTERING; ELECTROMAGNETIC waves; ABSORPTION
- Publication
Journal of Applied Polymer Science, 2019, Vol 136, Issue 8, pN.PAG
- ISSN
0021-8995
- Publication type
Article
- DOI
10.1002/app.47097