Corrosion Behaviour of Structural Ceramics in Supercritical Water

Abstract:

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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.

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Periodical:

Edited by:

P. VINCENZINI

Pages:

173-177

DOI:

10.4028/www.scientific.net/AST.45.173

Citation:

M. Nagae et al., "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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$35.00

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