Effect of silicon addition on mechanical properties of mullite-SiC composite refractories

DOI Web Site Web Site 17 References
  • LI Xiaochao
    School of Materials Science and Technology, China University of Geosciences (Beijing)
  • HUANG Zhaohui
    School of Materials Science and Technology, China University of Geosciences (Beijing)
  • LIU Yangai
    School of Materials Science and Technology, China University of Geosciences (Beijing)
  • FANG Minghao
    School of Materials Science and Technology, China University of Geosciences (Beijing)
  • HUANG Juntong
    School of Materials Science and Technology, China University of Geosciences (Beijing)
  • ZHANG Jingyu
    School of Materials Science and Technology, China University of Geosciences (Beijing)
  • CHEN Shusen
    School of Materials Science and Technology, China University of Geosciences (Beijing)

Search this article

Abstract

Mullite-SiC composite refractories were prepared using mullite, α-SiC, Si and Al2O3 as starting materials via carbonization reaction sintering by buried in coarse coal particles. The phase composition and mechanical properties of the composite refractories were studied. Results showed that main phases in the composite refractories consisted of mullite, α-SiC, β-SiC and a small amount of cristobalite. Both bulk density and flexural strength of the samples increased with the increase of silicon addition. The samples prepared at 1400°C, with 12 mass % of silicon content added in the initial raw materials, had better properties compared with the other samples, with bulk density of 2.28 g/cm3, flexural strength of 32.63 MPa, and retained flexural strength of 35.92 MPa after thermal shock by 5 times water quenching from 1200°C to room temperature. The slight increasing of flexural strength after 5 times thermal shock trials is arose from the protective oxidation of α/β-SiC and the second-sintering of samples.

Journal

References(17)*help

See more

Keywords

Details 詳細情報について

Report a problem

Back to top