Evolution of porosity, crack density, and CMAS penetration in thermal barrier coatings subjected to burner rig testing

• DOI: 10.1111/jace.16465
• Publication Date: 2019-03-31T12:04:11Z
• Authors: Daniel E. Mack; Rene Laquai; Bernd Müller; Oliver Helle; Doris Sebold; Robert Vaßen; Giovanni Bruno
• Keywords: 13. Climate action; ddc:530; Institut für Physik und Astronomie; 02 engineering and technology; 0210 nano-technology

Abstract Degradation of thermal barrier coatings (TBCs) in gas‐turbine engines due to calcium–magnesium–aluminosilicate (CMAS) glassy deposits from various sources has been a persistent issue since many years. In this study, state the art electron microscopy was correlated with X‐ray refraction techniques elucidate intrusion CMAS into porous structure atmospheric plasma sprayed (APS) TBCs and formation growth cracks under cycling burner rig. Results indicate that sparse nature infiltration as well kinetics rig are majorly influenced by wetting behavior CMAS. Despite obvious attack on grain boundaries, interaction yttria‐stabilized zirconia (YSZ) intruded no immediate impact density internal surfaces. At later stage horizontal is observed wider zone TBC layer.