Paper Titles
Corrosion of Si3N4-Ceramics in Acids and Basics
p.148
Corrosion of Glazes Coated with Functional Films in Detergent Solutions
p.156
Effect of Dense Layer Formation on Dissolution Rate of MgO-C Refractory in Molten Slag
p.162
Corrosion of Mullite in Contaminated Water Rich Gas Mixtures at High Temperatures: The Effect of Impurity Diffusion
p.167
Corrosion Behaviour of Structural Ceramics in Supercritical Water
p.173
Corrosion Behaviour of Vitrified Heavy Metals from Industrial Waste
p.178
Hydrothermal Synthesis of Advanced Ceramic Powders
p.184
Morphology of Zirconia Nanopowders Crystallised under Hydrothermal Conditions
p.194
Preparation and Characterization of Copper-Doped Tin Oxide Nanopowder via Hydrothermal Route
p.200

Corrosion Behaviour of Structural Ceramics in Supercritical Water

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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.

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Periodical:

Advances in Science and Technology (Volume 45)

Pages:

173-177

DOI:

https://doi.org/10.4028/www.scientific.net/AST.45.173

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Online since:

October 2006

Authors:

Masahiro Nagae, Tetsuo Yoshio, Kohei Oda

Keywords:

Corrosion Morphology, Structural Ceramics, Supercritical Water Corrosion

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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