Effect of preparation conditions on mechanical, dielectric and microwave absorption properties of SiC fiber/mullite matrix composite

Hui Gao, Fa Luo, Qinlong Wen, Yuchang Qing, Wancheng Zhou

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

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 languageEnglish
Pages (from-to)11625-11632
Number of pages8
JournalCeramics International
Volume45
Issue number9
DOIs
StatePublished - 15 Jun 2019

Keywords

  • Dielectric
  • Mechanical property
  • Microwave absorption
  • Sintering temperature
  • Sintering time

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