Mechanical and microwave absorbing properties of Tyranno® ZMI fiber annealed at elevated temperatures

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Abstract

The tensile strength and microwave absorbing properties of the amorphous silicon carbide fiber (Tyranno-ZMI) annealed at different temperatures were studied. The tensile strength of the as-received ZMI fiber tows was 1.1 GPa; and the average real and imaginary parts of permittivities of the as-received ZMI/resin samples were 11.3 and 10.5 respectively. The major dielectric loss mechanism of the fibers was conduction loss, which was due to high electrical conductivity of the enriched carbon in ZMI fibers. The 2.0 mm thick ZMI/resin composites could absorb 80% microwave energy in X band, indicating good microwave absorbing property. After heat treatment, fibers degraded gradually and permittivities increased, which were mainly attributed to the decomposition of amorphous SiCxOy and the growth of the SiC nanocrystals and free carbon nanodomains.

Original languageEnglish
Pages (from-to)8922-8931
Number of pages10
JournalCeramics International
Volume43
Issue number12
DOIs
StatePublished - 15 Aug 2017

Keywords

  • Composites
  • Dielectric properties
  • Mechanical properties
  • ZMI fibers

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