Enhanced high-temperature dielectric and microwave absorption properties of SiC fiber-reinforced oxide matrix composites

被引：15

作者：

Gao, Hui ^{[1
]}

Luo, Fa ^{[1
]}

Wen, Qinlong ^{[1
]}

Jia, Hongyao ^{[1
]}

Zhou, Wancheng ^{[1
]}

Zhu, Dongmei ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China

来源：

JOURNAL OF APPLIED POLYMER SCIENCE | 2019年 / 136卷 / 08期

关键词：

dielectric; high-temperature properties; infiltration and sintering process; microwave absorption; SiCf; Al2O(3)-SiO2; ABSORBING PROPERTIES; FABRICATION; BEHAVIOR;

D O I：

10.1002/app.47097

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

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.

引用

页数：7

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