Journal of Materials Science

, Volume 13, Issue 6, pp 1319–1328

Sodium-assisted oxidation of reaction-bonded silicon nitride

  • M. I. Mayer
  • F. L. Riley
Papers

DOI: 10.1007/BF00544739

Cite this article as:
Mayer, M.I. & Riley, F.L. J Mater Sci (1978) 13: 1319. doi:10.1007/BF00544739

Abstract

The oxidation of reaction-bonded silicon nitride in air, and with small amounts of sodium carbonate applied to the sample surface, has been studied. The action of the alkali is to cause short-term enhanced oxidation,which is terminated when specific compositions of the product sodium silicate glass are attained. These correspond closely to liquidus compositions in the Na2O-SiO2 system, and it is postulated that the retardation in the oxidation rate at this stage is due to the formation of a stable tridymite film at the silicon nitride-glass interface. The implications for the high temperature stability of reactionbonded silicon nitride components in alkali contaminated atmospheres are discussed.

Copyright information

© Chapman and Hall Ltd 1978

Authors and Affiliations

  • M. I. Mayer
    • 1
  • F. L. Riley
    • 1
  1. 1.Department of Ceramics, Houldsworth School of Applied ScienceThe University of LeedsLeedsUK

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