Corrosion Behavior of Sialon Ceramics in Supercritical Water |
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| Authors: | Masahiro Nagae Yasunori Koyama Seita Yasutake Tetsuo Yoshio Kohei Oda |
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| Affiliation: | Graduate School of Environmental Science, Okayama University, Okayama 700-8530, Japan; Department of Materials Science, Yonago National College of Technology, Yonago 683-8502, Japan |
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| Abstract: | The corrosion behavior of sialon ceramics was investigated in supercritical water at 450°C under 45 MPa for 2–50 h. α-sialon exhibited better corrosion resistance than β-sialon and α/β-sialon. Pitting corrosion with the formation of corrosion products was observed in the case of β-sialon and α/β-sialon. By contrast, the corrosion behavior of α-sialon was characterized by uniform corrosion with the formation of corrosion products. The degree of strength deterioration was strongly dependent on the corrosion morphology. The bending strength of α-sialon after corrosion for 30 h was about 90% of its initial strength, while the strength of β-sialon decreased to 65% of its original strength. |
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