Paper Title:
Corrosion Behaviour of Structural Ceramics in Supercritical Water
  Abstract

The corrosion behavior of Si3N4, SiC, mullite, alumina and sapphire was investigated in supercritical water at 450 °C and 45MPa for 2 to 50h. Corrosion resistance for the ceramics was as follows in the order; Si3N4 < SiC < mullite < alumina < sapphire. Pitting corrosion with formation of amorphous layer and intergranular corrosion due to dissolution of additives were observed in PLS-Si3N4 and PLS-SiC, respectively. The corrosion behavior of mullite was characterized by dissolution of SiO2 and formation of boehmite residue layer. High purity alumina ceramics showed the highest corrosion resistance in the ceramics. Intergranular corrosion proceeded in the alumina ceramics and its corrosion rate was strongly dependent on the impurity content.

  Info
Periodical
Edited by
P. VINCENZINI
Pages
173-177
DOI
10.4028/www.scientific.net/AST.45.173
Citation
M. Nagae, T. Yoshio, K. Oda, "Corrosion Behaviour of Structural Ceramics in Supercritical Water", Advances in Science and Technology, Vol. 45, pp. 173-177, 2006
Online since
October 2006
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