A delamination mechanism for thermal barrier coatings subject to calcium–magnesium–alumino-silicate (CMAS) infiltration

• Published in: Acta materialia Vol. 53; no. 4; pp. 1029 - 1039
• Main Authors: Mercer, C., Faulhaber, S., Evans, A.G., Darolia, R.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.02.2005; Elsevier Science
• Subjects: Applied sciences; Calcium–magnesium–alumino-silicate; Coatings; Delamination; Exact sciences and technology; Metals. Metallurgy; Nonmetallic coatings; Production techniques; Residual stresses; Scanning electron microscopy; Surface treatment; Scanning electron microscopy; Residual stresses; Coatings; Delamination; Calcium–magnesium–alumino-silicate; Forming; Infiltration; Non metal coating; Thermal barrier; Residual stress; Mechanism; Surface treatment; Calcium-magnesium-alumino-silicate

When a turbine airfoil attains temperatures that allow calcium–magnesium–alumino-silicate (CMAS) infiltration into the thermal barrier coating (TBC), a new mechanism of in-service spalling may be activated. The mechanism is associated with cold shock of the infiltrated layer during shut down. It has...