Influence of different matrices on the mechanical and microwave absorption properties of SiC fiber-reinforced oxide matrix composites |
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Authors: | Hui Gao Fa Luo Qinlong Wen Shichang Duan 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: | Fiber-reinforced ceramic matrix composites have excellent mechanical and microwave absorption properties, but still present considerable challenges. We prepared a SiCf/mullite-SiO2 composite (composite A) and a SiCf/Al2O3-SiO2 composite (composite B) by a precursor infiltration and sintering (PIS) process. Compared with the composite B, the composite A was easily densified. The flexural strength of the composite A reached 216 MPa, whereas that of the composite B was 159 MPa. The imaginary part of permittivity for composites A and B, which was determined by the contents of matrix and porosity, varied in the range of 2.5–3.5 and 3.6–5, respectively. The microwave absorption properties of the composite A were significantly enhanced in the range of 8.2–12.4 GHz. The results indicate that an optimal reflection loss of ?44 dB was reached at 12 GHz with a thickness of 2.9 mm for the composite A. These SiC fiber-reinforced oxide matrix materials have promising applications in microwave absorption, especially at high temperatures. |
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Keywords: | PIS process Mechanical property Dielectric Microwave absorption |
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