Effect of carbon contents on microstructure of B4C/SiC composites

Xiao Ju Gao, Lai Fei Cheng*, Jian Wu Cao, Dong Ming Yan, Cong Zhang, Peng Man, Jun Feng Qu, Ya Wei Zhou, Su Jie Sun

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

B4C/SiC composites were obtained by reaction sintering between C/B4C green body and liquid Si, and the effect of carbon contents on microstructure was investigated by OM and SEM. Results show that B4C/SiC composites consist of three new phases, namely, SiC, B13C2, and B12(C, Si, B)3. Compared with composites without carbon addition, microstructure becomes more even and smaller with increased carbon contents ranging from 0 vol.% to 10 vol.%, which may be due to the generation of a small amount of SiC and the increase in grain boundary. However, when the carbon contents exceeded 10 vol.%, residual carbon can forms defects, and abnormal grain growth is clearly observed. Meanwhile, increased carbon addition, more SiC is generated results in poor distribution uniformity of each phase.

Original languageEnglish (US)
Pages (from-to)482-487
Number of pages6
JournalOptoelectronics and Advanced Materials, Rapid Communications
Volume9
Issue number3-4
StatePublished - 2015
Externally publishedYes

Keywords

  • Abnormal grain growth
  • Microstructure
  • Reaction sintering
  • SiC/B<inf>4</inf>C composite

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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