Effect of alumina-silica-zirconia eutectic ceramic thermal barrier coating on the low cycle fatigue behaviour of cast polycrystalline nickel-based superalloy at 900 °C

0478233 - ÚFM 2018 RIV CH eng J - Journal Article
Obrtlík, Karel - Čelko, L. - Chráska, Tomáš - Šulák, Ivo - Gejdoš, P.
Effect of alumina-silica-zirconia eutectic ceramic thermal barrier coating on the low cycle fatigue behaviour of cast polycrystalline nickel-based superalloy at 900 °C.
Surface and Coatings Technology. Roč. 318, MAY (2017), s. 374-381. ISSN 0257-8972.
[RIPT - International Meeting on Thermal Spraying /7./. Limoges, 09.12.2015-12.12.2015]
R&D Projects: GA ČR(CZ) GA15-20991S
Institutional support: RVO:68081723 ; RVO:61389021
Keywords : Thermal barrier coating * Nickel-based superalloy * Plasma spraying * High temperature fatigue * Fatigue life * Cyclic stress-strain curve
OECD category: Audio engineering, reliability analysis; Audio engineering, reliability analysis (UFM-A); Audio engineering, reliability analysis (UFP-V)
Impact factor: 2.906, year: 2017

Cylindrical specimens of nickel-based superalloy Inconel 713LC in an as-cast condition and coated with a thermal barrier coating (TBC) system consisting of a CoNiCrAlY bond coat and a eutectic ceramic alumina-silica-zirconia top coat were cyclically loaded under strain control at 900 °C in air. TBC was deposited using atmospheric plasma spray and water-stabilised plasma spray techniques for the bond coat and the top coat, respectively. The microstructure of the substrate material and the TBC was characterised and the hardness of TBC was measured. The cyclic stress-strain response and fatigue life of both materials were assessed. The stress response of the TBC-coated superalloy is lower than the uncoated superalloy. The detrimental effect of TBC on the Basquin curve is documented. The specimen section and fracture surface observations revealed fatigue damage mechanisms in both the TBC-coated and uncoated specimens, and that finding helps explain the differences in the fatigue behaviour of both materials.
Permanent Link: http://hdl.handle.net/11104/0274628