Microstructure and mechanical behavior of the Cf/Ti3SiC2-SiC composites fabricated by compression molding and pressureless sintering

Chen Tang, Tiehu Li, Junjie Gao, Shilei Kang, Chuanyin Xiong, Hao Li, Shasha Jiao, Tingkai Zhao

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

Cf/Ti3SiC2-SiC composites with different content of short carbon fibers were fabricated by the combination of compression molding and pressureless sintering. Microstructure and mechanical behavior of the composites were studied to evaluate the comprehensive performance of the material. In comparison, composites without carbon fibers were also fabricated in the same way. The results indicate that Ti3SiC2 phases were synthesized in each cases and exhibit typical laminated structure with smooth surface. With the increase of carbon fiber content, composites turn from brittle to toughness, and show obvious elastic and no-linear regions on the force-displacement curve. Moreover, composite with 30% (volume fraction) carbon fiber shows the highest flexural strength (284.03 MPa), open porosity (15.78%), and lowest density (2.37 g cm−3). There were chemical reactions occurred between carbon fibers and matrix which formed strong covalent bonds and interfaces. The micrographs also reveal that fiber bridging and pulling-out are the most important reinforcement mechanisms which contribute to the mechanical properties of the composites.

Original languageEnglish
Pages (from-to)16204-16209
Number of pages6
JournalCeramics International
Volume43
Issue number18
DOIs
StatePublished - 15 Dec 2017

Keywords

  • Carbon fibers
  • Ceramic matrix composites
  • Compression molding
  • MAX phases
  • Pressureless sintering

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