Journal of Materials Science

, Volume 30, Issue 10, pp 2686–2693

Synthesis of silicon carbide through the sol-gel process from different precursors

  • V. Raman
  • O. P. Bahl
  • U. Dhawan
Papers

Abstract

Silicon carbide (SiC) was synthesised from silicon alkoxides and various carbon sources. Tetraethoxysilane (TEOS), methyltriethoxysilane (MTES) and a mixture of TEOS and MTES were hydrolysed in the presence of phenolic resin, ethylcellulose, polyacrylonitrile (PAN) and starch to incorporate the gel into the carbon source in the silica network. The gel thus obtained was carbonized at 800°C in an argon atmosphere to obtain the mixture of silica and carbon which when heated to 1550°C in argon yielded silicon carbide. The characterization of the product by X-ray, FTIR and SEM showed it to be β SiC with different crystallite and grain sizes. The difference in the crystallite and grain sizes is attributed to the nature of the carbon source. The density of the SiC obtained by the sol—gel process was found to be lower than the values reported for SiC and this is ascribed to the porous nature of the products generally obtained by this process.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    L. A. Harris, C. R. Kennedy, G. C. Wei and F. P. Jeffers, J. Amer. Ceram. Soc. 67 (1984) C-121.Google Scholar
  2. 2.
    G. C. Wei, C. R. Kennedy and L. A. Harris, Amer. Ceram. Soc. Bull. 63 (1984) 1054.Google Scholar
  3. 3.
    K. V. Krishnarao, J. Mater. Sci. Lett. 12 (1993) 1268.CrossRefGoogle Scholar
  4. 4.
    T. Hase and H. Suzuki, Yogyo Kyokaishi 86 (1978) 541.Google Scholar
  5. 5.
    A. Julbe, A. Larbot, C. Guizard, L. Cot, J. Charpin and P. Bergez, Mat. Res. Bull. 25 (1990) 601.CrossRefGoogle Scholar
  6. 6.
    F. Hatakeyama and S. K. Kanzaki, J. Amer. Ceram. Soc. 73 (1990) 2107.CrossRefGoogle Scholar
  7. 7.
    D. A. White, S.M. Oleff, R. D. Boyer, P. A. Bundinger and J. R. Fox, Adv. Ceram. Mat. 2 (1987) 45.Google Scholar
  8. 8.
    K. C. Chen, K. J. Thorne, A. Chemseddine, F. Babonneau and J. D. Mackenzie, Mat. Res. Symp. Proc. 121 (1988) 571.Google Scholar
  9. 9.
    J. R. Fox, D. A. White, S. M. Oleff, R. D. Boyer and P. A. Budinger, ibid. 73 (1986) 395.Google Scholar
  10. 10.
    I. S. Seog and C. H. Kim, J. Mater. Sci. 28 (1993) 3277.CrossRefGoogle Scholar
  11. 11.
    H. Tanaka and Y. Kurachi, Ceram. Int. 14 (1988) 109.CrossRefGoogle Scholar

Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • V. Raman
    • 1
  • O. P. Bahl
    • 1
  • U. Dhawan
    • 1
  1. 1.National Physical LaboratoryNew DelhiIndia

Personalised recommendations