摘要
Silicon carbide fiber-reinforced mullite matrix (SiC f /Mu) composites were fabricated via an infiltration and sintering method. Effects of sintering parameters on microstructure, mechanical, dielectric and microwave absorption properties of SiC f /Mu composites have been investigated. The flexural strength is significantly improved with increasing sintering temperature, and the highest flexural strength of 213 MPa is obtained in vacuum at 1000 °C for 2 h. The performances of composites with different holding time are further studied at 1000 °C. The flexural strengths of composites sintered at 1000 °C for 2 and 4 h reach 213 and 219 MPa, respectively. The failure displacement of the composite sintered at 1000 °C for 4 h reaches 0.39 mm. The excellent microwave absorption properties are achieved for the composite sintered at 1000 °C for 2 h. The minimum reflection loss (RL) reaches −38 dB with a thickness of 2.9 mm at 12 GHz and the effective absorbing bandwidth (RL ≤ −10 dB) with a thickness of 3.4 mm covers the whole X−band, which indicate that SiC f /Mu composite is a good candidate for microwave absorbing materials. These results provide valuable solutions to obtaining structural-functional materials for microwave absorption applications in civil and military areas.
源语言 | 英语 |
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页(从-至) | 11625-11632 |
页数 | 8 |
期刊 | Ceramics International |
卷 | 45 |
期 | 9 |
DOI | |
出版状态 | 已出版 - 15 6月 2019 |