The effects of high-temperature annealing on microstructure and performance of Cf/C-SiC composites modified by FeSi2

Shangwu Fan, Yifan Ning, Xu Ma, Chuan Yang, Liuyang He, Juanli Deng, Laifei Cheng, Litong Zhang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

FeSi2 modified C/C-SiC composites (C/C-SiC-FeSi2) are fabricated by chemical vapor infiltration (CVI) combined with reactive melt infiltration (RMI) with FeSi75 alloy. The effects of high-temperature annealing (1600 °C, 1650 °C, 1700 °C) on the microstructure and performance of C/C-SiC-FeSi2 are investigated. With the elevation of annealing temperature, the porosity of the composites and the content of SiC increase due to the evaporation of liquid Si and the further reaction of Si and C. The mechanical performance gradually decreases due to the catalytic graphitization of the carbon fiber, the high porosity and the thermal residual stress (TRS) caused by thermal mismatch of different phases. The coefficient of thermal expansion and thermal diffusivity slightly decrease with increasing annealing temperature for the increase of porosity. However, the friction performance of the heat treated materials at high braking speed are greatly improved attributing to the increase of SiC content and the capturing and storage function of pores on hard particles.

Original languageEnglish
Pages (from-to)15200-15207
Number of pages8
JournalCeramics International
Volume44
Issue number13
DOIs
StatePublished - Sep 2018

Keywords

  • C/C-SiC composites
  • High-temperature annealing
  • Microstructure
  • Performance

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