Journal of Materials Science

, Volume 33, Issue 10, pp 2537–2549 | Cite as

Synthesis of beta silicon carbide powders using carbon coated fumed silica

  • Rasit Koc
  • Sai V Cattamanchi
Article

Abstract

The synthesis of beta silicon carbide (β-SiC) powders by carbothermic reduction of carbon coated silica and silica mixed with carbon black was investigated. The production of β-SiC powders by using carbon coated silica consists of two steps. The first step is to prepare the carbon coated silica precursor by coating fumed silica particles with carbon by pyrolytic cracking of a hydrocarbon gas (C3H6). This provides intimate contact between the reactants and yields a better distribution of carbon within the fumed silica. Fumed silica was also mechanically mixed with carbon black for comparison. Both starting mixtures were reacted in a tube furnace for 2 h at temperatures of 1300°C to 1600°C in 1 l min-1 flowing argon. The reaction products were characterized using weight loss data, X-ray diffraction (XRD), a BET surface area analyser, oxygen and free carbon analysis and transmission electron microscopy (TEM). The carbon coating process resulted in a more complete reaction, purer product and high yield SiC powders with very little agglomeration at temperatures of 1500°C and 1600°C. The β-SiC powders produced at 1600°C for 2 h in argon gas flow have oxygen content of 0.3 wt%, a very fine particle size 0.1–0.3 μm and uniform shape. © 1998 Chapman & Hall

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    V. D. Kristic, J. Am. Ceram. Soc. 75 (1992) 170.Google Scholar
  2. 2.
    T. Hase and H. Suziki, Yogyo KyokaiShi, 86 (1978) 541.Google Scholar
  3. 3.
    D. P. Stinton, T. M. Besmann and R. A. Lowden, Am. Ceram. Soc. Bull. 67 (1988) 350.Google Scholar
  4. 4.
    A. W. Weimer, K. J. Nilsen, G. A. Cochran and R. P. Roach, AIChE, J. 39 (1993) 493.Google Scholar
  5. 5.
    N. Klinger, E. L. Strauss and K. L. Komarek, J. Am. Ceram. Soc. 49 (1966) 369.Google Scholar
  6. 6.
    J. G. Lee and I. B. Cutler, J. Am. Ceram. Soc. Bull. 54 (1975) 195.Google Scholar
  7. 7.
    G. C. Wei, C. R. Kennedy and L. A. Harris, ibid. 63 (1984) 1054.Google Scholar
  8. 8.
    P. D. Miller, J. G. Lee and I. B. Cutler, J. Am. Ceram. Soc. 62 (1979) 147.Google Scholar
  9. 9.
    V. M. Kevorkijan, M. Komac and D. Kolar, J. Mater. Sci. 27 (1992) 2705.Google Scholar
  10. 10.
    C. Greskovich and J. H. Rosolowski, J. Am. Ceram. Soc. 59 (1976) 336.Google Scholar
  11. 11.
    G. Glatzmier and R. Koc, US Patent 5 324 494 (1994).Google Scholar
  12. 12.
    R. Koc, G. Glatzmier, K. Scholl, M. Anselmo and J. Sibold, R&D Mag. 37 (1995) 58.Google Scholar

Copyright information

© Chapman and Hall 1998

Authors and Affiliations

  • Rasit Koc
    • 1
  • Sai V Cattamanchi
    • 1
  1. 1.Department of Mechanical Engineering and Energy ProcessesSouthern Illinois UniversityCarbondaleUSA

Personalised recommendations