Corrosion Behaviour of Structural Ceramics in Supercritical Water |
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| Journal | Advances in Science and Technology (Volume 45) |
|---|---|
| Volume | 11th International Ceramics Congress |
| Edited by | P. VINCENZINI |
| Pages | 173-177 |
| DOI | 10.4028/www.scientific.net/AST.45.173 |
| Citation | Masahiro Nagae et al., 2006, Advances in Science and Technology, 45, 173 |
| Online since | October, 2006 |
| Authors | Masahiro Nagae, Tetsuo Yoshio, Kohei Oda |
| Keywords | Corrosion Morphology, Structural Ceramics, Supercritical Water Corrosion |
| Abstract | The corrosion behavior of Si3N4, SiC, mullite, alumina and sapphire was investigated in supercritical water at 450 ºC 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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