Hostname: page-component-54dcc4c588-rz4zl Total loading time: 0 Render date: 2025-10-11T16:30:00.287Z Has data issue: false hasContentIssue false
  • English
  • Français

Gaseous Alkali Corrosion Kinetics of Silicon Carbide

Published online by Cambridge University Press:  22 February 2011

Tawei Sun ,
Gary R. Pickrell  and
Jesse J. Brown Jr.
Tawei Sun
Affiliation:
Center for Advanced Ceramic Materials, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
Jesse J. Brown Jr.
Affiliation:
Center for Advanced Ceramic Materials, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061
Get access

Abstract

The gaseous alkali corrosion kinetics of α-SiC were systematically investigated from 950°C to 1100°C in an atmosphere containing 0.98 vol% sodium nitrate vapors. The reaction of the SiC in the alkali-containing atmosphere follows a linear rate law with an activation energy of 104 kJ/mol. The alkali corrosion is composed of dissolution of SiO2 in the sodium silicate liquid, oxidation of SiC, and adsorption of Na2O from the vapor phase. The overall reaction appears to be controlled by the oxidation at the SiC substrate/sodium silicate liquid interface.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 327: Symposium N – Covalent Ceramics II: Non-Oxides , 1993 , 325
Copyright
Copyright © Materials Research Society 1994

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

Article purchase

Temporarily unavailable

References

1. Jacobson, N.S., J. Am. Ceram. Soc. 69, 74 (1986).Google Scholar
2. Sucov, E.W., J. Am. Ceram. Soc. 46, 14 (1963).Google Scholar
3. Williams, E.L., J. Am. Ceram. Soc. 48, 190 (1965).Google Scholar
4. Muehlenbachs, K. and Schaeffer, H. A., Can. Mineral. 15, 179 (1977).Google Scholar
5. Oishi, Y., Terai, R., and Ueda, H., Mass Transport Phenomena in Ceramics, edited by Cooper, A. R. and Heuer, A. H. (Plenum Press, New York, 1975), p. 297.Google Scholar
6. Smialek, J.L. and Jacobson, N.S., J. Am. Ceram. Soc. 69, 741 (1986).Google Scholar
7. Jacobson, N.S., Stearns, C.A., and Smialek, J.L., Adv. Ceram. Mater. 1, 154 (1986).Google Scholar
8. lomata, Y., Silicon Carbide Ceramics-1, edited by Somiya, S. and Inomata, Y. (Elsevier Science Publishers, New York, 1991), p. 9.Google Scholar
9. Paul, A., Chemistry of Glasses, 2nd ed. (Chapman and Hall, New York, 1990), p. 89.Google Scholar
10. Sun, T., Pickrell, G.R., and Brown, J.J. Jr., (to be published).Google Scholar
11. Schwerdtfeger, K., J. Phys. Chem. 70, 2131 (1966).Google Scholar
12. Kracek, F.C., J. Am. Chem. Soc. 61, 2869 (1939).Google Scholar