Stress variation with thermal cycling in the thermally grown oxide of an EB-PVD thermal barrier coating

• Published in: Surface & coatings technology Vol. 179; no. 2; pp. 286 - 296
• Main Authors: Sridharan, Swetha, Xie, Liangde, Jordan, Eric H., Gell, Maurice
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 23.02.2004; Elsevier
• Subjects: Condensed matter: structure, mechanical and thermal properties; Cross-disciplinary physics: materials science; rheology; Deposition by sputtering; Exact sciences and technology; Materials science; Mechanical and acoustical properties; Methods of deposition of films and coatings; film growth and epitaxy; Photoluminescence piezo-spectroscopy; Physical properties of thin films, nonelectronic; Physics; Residual stress; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties); Thermal barrier coatings; Thermally grown oxide; Thermal barrier coatings; Thermally grown oxide; Photoluminescence piezo-spectroscopy; Residual stress; Stress analysis; Oxide layer; Photoluminescence; Physical vapor deposition; Stabilized zirconia; Residual stresses; Electron beam deposition; Experimental study; Thermal cycling
• ISSN: 0257-8972; 1879-3347
• DOI: 10.1016/S0257-8972(03)00858-2

A measurement approach for detecting thermal barrier coating (TBC) damage and assessing remaining life is described in this study. This is based on an experimental study of the oxide stress evolution as a function of thermal cycling. Residual stress in the thermally grown oxide (TGO) has been measured using photo-stimulated luminescence piezo spectroscopy (PLPS) for electron beam physical vapor deposited TBCs that were thermally cycled at 1100, 1121 and 1151 °C using 1-h and 24-h cycling periods. The observed monotonic change in the oxide stress level with life fraction is systematic with cycle time and nearly independent of exposure temperatures. The temperature independence of the measured stress with life fraction greatly simplifies the use of this technology for non-destructive evaluation of this TBC coating.