Mechanical and dielectric properties of SiCf/BN/SiBCN composites via different synthesis technologies

Chaokun Song, Xiaofei Liu, Fang Ye, Yongsheng Liu, Laifei Cheng

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

SiC fibers reinforced SiBCN ceramic matrix composites (SiCf/BN/SiBCN composites) were synthesized by direct chemical vapor infiltration (CVI), polymer infiltration pyrolysis (PIP) or chemical vapor infiltration combined with polymer infiltration pyrolysis (CVI + PIP). It is shown that the insertion of a continuous and dense SiBCN matrix via the CVI process improves the flexural strength and modulus. Interface debonding and fiber pullout happened with 50–100 nm BN interface in CVI and CVI + PIP SiCf/BN/SiBCN composites. The relative complex permittivity was measured in X-band. Higher ε′′ values in CVI-containing composites can be observed, which can be attributed to the accumulation of C and SiC phases and a multilayer matrix. Strong electromagnetic wave attenuation ability was obtained with high dielectric loss.

Original languageEnglish
Pages (from-to)4417-4423
Number of pages7
JournalJournal of the European Ceramic Society
Volume39
Issue number14
DOIs
StatePublished - Nov 2019

Keywords

  • CVI
  • Dielectric property
  • Flexural strength
  • PIP
  • SiC/BN/SiBCN composites

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