Ceramic thermal barrier coating-systems (TBCs) used on internally cooled metallic parts of gas turbine engines experience extreme loading conditions in service. Available testing methods usually simplify the loading conditions resulting in a ranking between different TBC-qualities with the uncertainty whether ranking under turbine engine service condition will be the same. In order to get data for a lifetime assessment for TBCs under service conditions, a testing facility has been developed that simulates the fatigue load imposed onto a gas turbine blade during a service cycle in a realistic way, that means the simultaneous cyclic mechanically and thermally induced loads due to rotational forces, heating, cooling and transient changes of the thermal gradient over the cross section. In order to achieve short testing times with this TGMF- (Thermal Gradient Mechanical Fatigue) test facility the damages depending on the exposure time, for example oxidation or sintering at high temperatures, are imposed separately. TGMF-tested and aged specimens are examined microstructurally and the observed damages and features are discussed.
Thermal-mechanical fatigue testing of TBC-systems with controlled thermal gradients
2001
8 Seiten, 10 Bilder, 10 Quellen
Conference paper
English
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