Abstract
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.
Original language | English |
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Pages (from-to) | 11625-11632 |
Number of pages | 8 |
Journal | Ceramics International |
Volume | 45 |
Issue number | 9 |
DOIs | |
State | Published - 15 Jun 2019 |
Keywords
- Dielectric
- Mechanical property
- Microwave absorption
- Sintering temperature
- Sintering time