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4638 |
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Wednesday, May 11, 2016, Room 3E 1:40 PM Suspension Spraying II |
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Erosion behavior of multilayered thermal barrier coatings deposited by suspension plasma spray |
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Satyapal Mahade / University West, Sweden Nicholas Curry/ Treibacher Industrie AG, Austria Stefan Björklund/ Department of Engineering Science, University West, Sweden Nicolaie Markocsan*/ Department of Engineering Science, University West, Sweden Per Nylén/ Department of Engineering Science, University West, Sweden Robert Vaßen/ Institute of Energy Research, Forschungszentrum Jülich, Germany |
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Yttria stabilized zirconia (8YSZ) is the standard ceramic material for thermal barrier coating (TBC) applications due to its lower thermal conductivity, excellent phase stability, higher coefficient of thermal expansion (CTE) & higher fracture toughness. However, it has limitations above 1200ºC such as sintering & CMAS (Calcium Magnesium Alumino Silicates) infiltration. New ceramic material such as gadolinium zirchonate (GZ)is considered as promising top coat candidates for high temperature (>1200ºC) TBC applications due to its lower thermal conductivity, good sintering resistance and CMAS infiltration resistance. Single layer 8YSZ, double layer GZ/YSZ and triple layer GZdense/GZ/YSZ were deposited by suspension plasma spray (SPS). Microstructural analysis was carried out by SEM & optical microscopy. Porosity measurements were made by water intrusion method and image analysis method. Phases formed in the top coat of as sprayed TBCs were confirmed by XRD analysis. All the as sprayed multilayered TBCs were subjected to erosion test at room temperature and their erosion behavior was compared with the industry standard single layer 8YSZ. After the test, the eroded TBCs were cold mounted and analyzed by SEM. Keywords: Erosion, Gadolinium Zirchonate, Multilayered Thermal Barrier Coating, Suspension Plasma Spray, Yttrium Aluminum Garnet, Yttria Stabilized Zirconia |