Effects of substrate curvature radius, deposition temperature and coating thickness on the residual stress field of cylindrical thermal barrier coatings

• Published in: Surface & coatings technology Vol. 205; no. 8; pp. 3093 - 3102
• Main Authors: Mao, W.G., Jiang, J.P., Zhou, Y.C., Lu, C.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 25.01.2011; Elsevier
• Subjects: Applied sciences; Coating; Coating position; Cross-disciplinary physics: materials science; rheology; Curvature; Curvature radius; Deposition; Exact sciences and technology; Materials science; Mathematical analysis; Metals. Metallurgy; Nonmetallic coatings; Oxides; Physics; Production techniques; Residual stress; Stress concentration; Surface treatment; Surface treatments; Thermal barrier coatings; Thermal barrier coatings; Coating position; Residual stress; Curvature radius; Temperature; Stress distribution; Thermal barriers; Surface treatments; Residual stresses; Non metal coating; Layer thickness
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/j.surfcoat.2010.11.020

In a thermal barrier coating (TBC) system with cylindrical geometry, the position of coating plays an important role in the distribution of residual stress. In this paper, the residual stress field in three different types of TBCs with cylindrical geometry has been analyzed. The main focus is on the effects of substrate curvature radius, deposition temperature and coating thickness on the residual stress distribution during a deposition process. The results show that the substrate curvature radius significantly affects the distributions of radial and hoop residual stresses, which are in good agreement with experimental measurements by photo-stimulated luminescence piezospectroscopy (Wang et al., Acta Mater., 2009, 57(1):182–195). The maximum radial residual stress locates closely to the coating/thermal grown oxide interface. However, the maximum hoop residual stress lies in the thermal grown oxide layer, which is much more than other three layers and presents a strong stress singularity along the thickness direction. ►The coating position strongly influences the distribution of residual stress in TBCs. ►Substrate curvature plays an important role in the evolution of residual stress. ►The deposition temperature and coating thickness should be as small as possible.