Corrosion Behavior of Sialon Ceramics in Supercritical Water

• Published in: Journal of the American Ceramic Society Vol. 89; no. 11; pp. 3550 - 3553
• Main Authors: Nagae, Masahiro, Koyama, Yasunori, Yasutake, Seita, Yoshio, Tetsuo, Oda, Kohei
• Format: Journal Article
• Language: English
• Published: Malden, USA Blackwell Publishing Inc 01.11.2006; Blackwell; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Building materials. Ceramics. Glasses; Ceramic industries; Ceramics; Chemical industry and chemicals; Corrosion; Corrosion products; Deterioration; Exact sciences and technology; Miscellaneous; Pitting (corrosion); Sialons; Strength; Tables; Technical ceramics; Water; Water temperature; Water corrosion; Scanning electron microscopy; Aluminium nitride; Silicon nitride; Mechanical properties; Supercritical state; Experimental study; Grain boundary; Corrosion resistance; Bending strength; Sialon; Technical ceramics; Nitrides oxides
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2006.01243.x

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.