|About this Abstract
||Materials Science & Technology 2012
||Surface Protection for Enhanced Materials Performance: Science, Technology and Applications
||Quantification of Rumpling in an MCrAlY TBC Bond Coat Using SEM-Based 3D Imaging
||Sina Shahbazmohamadi, Eric H Jordan
|On-Site Speaker (Planned)
Rumpling or surface shape change is widely acknowledged as a source of damage in beta Pt modified NiAl bond coats. Here we demonstrate that MCrAlY bond coats experience rumpling that produces significant stress in the top coat. The rumpling of the bondcoat can be a contributing factor in the failure of thermal barrier coatings (TBCs). In this study, the 3D surface information of the MCrAlY bond coats has been obtained using SEM-based photogrammetry. Certain aspects of image acquisition have been optimized to enhance the fidelity of the technique and the optimization process is described. Focus Ion Beam patterning has been employed for accurate image registration for imaging before and after heat treatment. The technique can decisively demonstrate the existence of rumpling in such bond coats. Further Image processing has been performed to quantify the surface geometry change including profile, area and volume analysis.