Enhanced high-temperature dielectric and microwave absorption properties of SiC fiber-reinforced oxide matrix composites |
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Authors: | Hui Gao Fa Luo Qinlong Wen Hongyao Jia Wancheng Zhou Dongmei Zhu |
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Affiliation: | State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an, 710072, Shaanxi, China |
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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. |
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Keywords: | dielectric high-temperature properties infiltration and sintering process microwave absorption SiCf/Al2O3-SiO2 |
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