The Korean Journal of Ceramics

한국세라믹학회 (The Korean Ceramic Society)
권호 표지

Corrosion of Alumina-Chromia Refractory by Alkali Vapors: 1. Thermodynamic Approach

  • Lee, Kyoung-Ho (Dept. Mat. Sci and Eng. Soonchunhyang University) ;
  • Jesse J. Brown Jr (Dept. of Mat. Sci. and Eng., Virginia Polytechnic Institute and State University, Blacksburg, U.S.A)
  • 발행 : 1995.03.01
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초록

Theoretical predictions were made for thermodynamically stable phases which formed when alkali(sodium and Potassium) vapors reacted with the 90% $Al_2O_3$-10% $Cr_2O_3$ refractory under coal gasifying atmosphere using the computer program of SOLGASMIX-PV. The calculation results showed that the stable compounds that formed were $X_2O$.$Al_2O_3$ and $X_2O$.$llAl_2O_3$(X=$Na^+$ or $K^+$), depending upon the alkali concentration. The presence of sulfur in gasifying atmospheres did not appear to affect the species of alkali reaction products. Alkali attack at high temperatures is likely to cause serious degradation at the hot face of the refractory, indicating that the alkali concentration is an important factor to affect the degradation of the refroctory.

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