Effects of Syngas Particulate Fly Ash Deposition on the Mechanical Properties of Thermal Barrier Coatings on Simulated Film-Cooled Turbine Vane Components
- 1 Center for Alternative Fuels, Engines and Emissions, Department of Mechanical and Aerospace Engineering, Morgantown, USA
- 2 Center for Alternative Fuels, Engines and Emissions, Department of Mechanical and Aerospace Engineering, Morgantown, USA
- 3 Department of Mechanical and Aerospace Engineering, Morgantown, USA
- 4 Department of Mechanical and Aerospace Engineering, Morgantown, USA
Abstract
Research is being conducted to study the effects of particulate deposition from contaminants in coal synthesis gas (syngas) on the mechanical properties of thermal barrier coatings (TBC) employed on integrated gasification combined cycle (IGCC) turbine hot section airfoils. West Virginia University (WVU) had been working with US Department of Energy, National Energy Technology Laboratory (NETL) to simulate deposition on the pressure side of an IGCC turbine first stage vane. To model the deposition, coal fly ash was injected into the flow of a combustor facility and deposited onto TBC coated, angled film-cooled test articles in a high pressure (approximately 4 atm) and a high temperature (1560 K) environment. To investigate the interaction between the deposition and the TBC, a load-based multiple-partial unloading micro-indentation technique was used to quantitatively evaluate the mechanical properties of materials. The indentation results showed the Young’s Modulus of the ceramic top coat was higher in areas with deposition formation due to the penetration of the fly ash. This corresponds with the reduction of strain tolerance of the 7% yttria-stabilized zirconia (7YSZ) coatings.
- Padture, N.P., Gell, M. and Jordan, E.H. (2002) Thermal Barrier Coatings for Gas-Turbine Engine Applications. Sci- ence AAAS, 296, 280-284. http://dx.doi.org/10.1126/science.1068609
- Schulz, U., Leyans, C., Fritscher, K., Peters, M., Saruhan-Brings, M., Lavigne, O., Dorvaux, J.-M., Poulain, M., Mév- rel, R. and Caliez, M. (2003) Some Recent Trends in Research and Technology of Advanced Thermal Barrier Coatings. Aerospace Science and Technology, 7, 73-80. http://dx.doi.org/10.1016/S1270-9638(02)00003-2
- Wellman, R.G. and Nicholls, J.R. (2000) Some Observation on Erosion Mechanisms of EB PVD TBCs. Wear, 242, 89-96. http://dx.doi.org/10.1016/S0043-1648(00)00391-4
- Levi, C.G., Hutchinson, J.W., Vidal-Sétif, M.-H. and Johnson, C.A. (2012) Environmental Degradation of Thermal- Barrier Coatings by Molten Deposits. MRS Bulletin, 37, 932-941. http://dx.doi.org/10.1557/mrs.2012.230
- Drexler, J.M., Gledhill, A.D., Shinoda, K., Vasiliev, A.L., Reddy, K.M., Sampath, S. and Padture, N.P. (2011) Jet En- gine Coatings for Resisting Volcanic Ash. Advanced Materials, 23, 2419-2424. http://dx.doi.org/10.1002/adma.201004783
- Murphy, R.G., Nix, A.C., Lawson, S.A., Straub, D. and Beer, S.K. (2012) Preliminary Experimental Investigation of the Effects of Particulate Deposition on IGCC Turbine Film-Cooling in a High-Pressure Combustion Facility. ASME Turbo Expo 2012: Turbine Technical Conference and Exposition, 4, 979-986. http://dx.doi.org/10.1115/GT2012-68806
- Eberl, C., Gianola, D.S., Wang, X., He, M.Y., Evans, A.G. and Hemker, K.J. (2011) A Method for in Situ Measure- ment of the Elastic Behavior of a Columnar Thermal Barrier Coating. Acta Materialia, 59, 3612-3620. http://dx.doi.org/10.1016/j.actamat.2011.02.034
- Tannenbaum, J.M. (2011) Progression in Non-Destructive Spallation Prediction and Elevated Temperature Mechanical Property Evaluation of Thermal Barrier Coating Systems by Use of a Spherical Micro-Indentation Method. Ph.D. Dis- sertation, West Virginia University, Morgantown.
- Otunyo, D.A. (2012) Mechanical Property Evaluation of Thermal Barrier Coating Systems at Elevated Temperatures by Use of Spherical Micro-Indentation Method. M.S. Thesis, West Virginia University, Morgantown.
- Hass, D. (2012) Thermal Barrier Coating Environmental Durability Enhancement (CMAS). NAVAIR, N06-032.
- Gleeson, B., Wang, W., Hayashi, S. and Sordelet, D.J. (2004) Effects of Platinum on the Interdiffusion and Oxidation Behavior of Ni-Al-Based Alloys. Material Science Forum, 461, 213-222. http://dx.doi.org/10.4028/www.scientific.net/MSF.461-464.213