|
2606 |
|
Wednesday, September 28, 2011, Saal B2.1 4:50 PM Plasma Spraying 1 |
|
Advanced thermal barrier coatings from Ti-doped YSZ systems
|
|
Maria Ophelia Jarligo* / Institut für Energie- und Klimaforschung IEK-1, Forschungszentrum Jülich GmbH, Germany Georg Mauer/ Forschungszentrum Jülich GmbH / IEK-1, Germany Daniel Mack/ Forschungszentrum Jülich GmbH / IEK-1, Germany Robert Vaßen/ Forschungszentrum Jülich GmbH / IEK-1, Germany Detlev Stöver/ Forschungszentrum Jülich GmbH / IEK-1, Germany |
|
Fracture toughness and phase stability are crucial properties of thermal barrier coatings (TBC) during highly loaded thermomechanical operations in gas turbines. While several alternative TBC materials have exhibited excellent thermal resistance, their potential applicability has been limited due to poor endurance to cyclic stresses. The addition of TiO2 to the non-transformable t´-YSZ has been found to effectively enhance the fracture toughness and phase stability of YSZ at high temperature exposures. Thermal cycling tests in a burner rig were conducted on TBCs prepared from atmospheric plasma sprayed titania-doped YSZ to verify this phenomena. Exposure temperature was 1400°C at the surface and thermal gradient across the sample was provided by simultaneous back-cooling treatment. Cycling tests were halted when spallation on the TBC was visible indicating failure. The lifetime of the TBCs including the mechanism of failure as influenced by the addition of TiO2 will be reported. |