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JOM

, Volume 45, Issue 12, pp 22–25 | Cite as

Oxidation of Si-based ceramics in the presence of alkali halide vapors

  • Michael J. McNallan
  • Pei Pei Hsu
  • Soo Young Lee
Environmental Effect Research Summary

Abstract

Nonoxide silicon-based ceramics owe their oxidation resistance to the formation of a thin silica film that separates the ceramic from oxidizing environments. This silica film can be fluxed by alkali oxides to form low-melting alkali silicate corrosion products that do not provide protection. Alkali chlorides and other halides have sufficiently high vapor pressures that silica fluxing can occur without the formation of a condensed halide salt. The rates of oxidation of Si, SiC, and Si3N4 are influenced by the composition of gas mixtures containing these species.

Keywords

Silicon Carbide Corrosion Product Alkali Halide Silica Film Potassium Silicate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© TMS 1993

Authors and Affiliations

  • Michael J. McNallan
    • 1
  • Pei Pei Hsu
    • 2
  • Soo Young Lee
    • 3
  1. 1.University of IllinoisChicagoUSA
  2. 2.Microland ComputersUSA
  3. 3.Korea Institute of Machinery and MetalsKorea

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