期刊
JOURNAL OF APPLIED POLYMER SCIENCE
卷 136, 期 8, 页码 -出版社
WILEY
DOI: 10.1002/app.47097
关键词
dielectric; high-temperature properties; infiltration and sintering process; microwave absorption; SiCf; Al2O(3)-SiO2
资金
- Chinese National Natural Science Foundation [51072165]
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 159MPa, whereas that of the SiCf/Al2O3 composite is only 50MPa. 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 -37dB in the temperature of 200 degrees C at 8.6 GHz, and the effective absorption bandwidth (RL-5 dB) is 4.2 GHz (8.2-12.4 GHz) below 400 degrees C. The superior microwave absorption properties at high temperatures indicate that the SiCf/Al2O3-SiO2 composite has promising applications in civil and military areas. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47097.
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