Effect of carbon content on mechanical properties of SiC/B4C prepared by reaction sintering

Xiao Ju Gao, Jian Wu Cao*, Lai Fei Cheng, Dong Ming Yan, Cong Zhang, Peng Man

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


SiC/B4C composite was obtained by reaction sintering with Si infiltration, and the effects of carbon content on mechanical properties and the microstructure were investigated. The results showed that the mechanical properties of the SiC/B4C composite improved firstly and then worsened with increasing carbon content. The optimum comprehensive properties of the composite were obtained by addition of 10vol% carbon. The hardness, bending strength, and fracture toughness of the composite were 19.63 GPa, 358 MPa and 3.96 MPa·m1/2, respectively. In addition, at carbon levels below 10vol%, the microstructure became more uniform as the carbon content increased. However, at carbon levels above 10vol%, the addition of carbon led to a fracture mode transformation, from combination of intergranular and transgranular to transgranular, which contributed to a change in the mechanical properties of the SiC/B4C composite.

Original languageEnglish (US)
Pages (from-to)102-106
Number of pages5
JournalWuji Cailiao Xuebao/Journal of Inorganic Materials
Issue number1
StatePublished - Jan 1 2015
Externally publishedYes


  • Fracture mode
  • Infiltration of Si
  • Reaction sintering
  • SiC/BC composite

ASJC Scopus subject areas

  • Materials Science(all)
  • Inorganic Chemistry


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