Simultaneous enhancement of mechanical and microwave absorption properties with a novel in-situ synthesis α-Al2O3 fillers for SiCf/SiC composites

Zhaowen Ren, Wancheng Zhou, Yuchang Qing, Hui Xie, Shichang Duan, Haijun Pan, Xiaoke Lu, Xia Chai, Di Ran, Yingze Zheng

Research output: Contribution to journalArticlepeer-review

14 Scopus citations

Abstract

The Al and H3BO3 mixed powder was introduced into the PCS/Xylene precursor solution as in-situ synthesis α-Al2O3 filler by precursor infiltration and pyrolysis (PIP) method. The in-situ synthesis filler can effectively decrease the open porosity of SiCf/SiC composites and give rise to multiple scattering of microwave and dipolar polarization. Therefore, the mechanical and microwave absorption properties of SiCf/SiC composites can be simultaneously enhanced. The effects of in-situ synthesis filler on the morphologies, flexure strength and reflection loss values of SiCf/SiC composites were investigated. With 2 wt% in-situ synthesis filler, the flexure strength of SiCf/SiC composite was 305 MPa and the maximum reflection loss (RLm) can reach − 54.68 dB with the effective absorption band (EAB) of 3.51 GHz in the X band. With 5 wt% in-situ synthesis filler, the flexure strength of SiCf/SiC composite was 207 MPa and the RLm was − 30.91 dB. Due to the inefficient infiltration process, the RLm of SiCf/SiC composites with 10 wt% in-situ synthesis filler was only − 27.36 dB. Nevertheless, the flexure strength of that composite was 259 MPa, owing to the dense matrix. Additionally, the flexure strength of SiCf/SiC composite without filler was 148 MPa and the RLm was − 26.40 dB.

Original languageEnglish
Pages (from-to)4723-4734
Number of pages12
JournalJournal of the European Ceramic Society
Volume42
Issue number12
DOIs
StatePublished - Sep 2022

Keywords

  • Flexure strength
  • In-situ synthesis filler
  • Microwave absorption
  • SiC/SiC composites

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