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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
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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.

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

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