Thermal fatigue failure of thermal barrier coatings with a high-Cr MCrAIY bond coat
2016 (English)In: Proceedings of the International Thermal Spray Conference (ITSC), 2016, Vol. 324, 273-278 p.Conference paper (Refereed)
Thermal barrier coatings (TBCs) were air-plasma sprayed onto Hastelloy X substrates. The TBCs consisted of a high-Cr MCrAlY (M for Ni and Co) bond coat and a yttria-stabilized zirconia (YSZ) top coat. The TBC samples were thermally cycled between 100 ºC and 1100 ºC with 1 hour dwell time at 1100 ºC. The thermal fatigue failure of the TBCs was investigated via microstructure analyses. The final fatigue failure of the TBCs was caused by the formation of interface-parallel cracks in the YSZ top coat. The formation of the cracks was found to be strongly related to the oxidation behaviour of the MCrAlY bond coat. The development of the oxide layers was therefore studied in detail. A thermokinetic model was also used to deepen the understanding on the elemental diffusion behavior in the materials.
Place, publisher, year, edition, pages
2016. Vol. 324, 273-278 p.
Manufacturing, Surface and Joining Technology Metallurgy and Metallic Materials Materials Chemistry Composite Science and Engineering
IdentifiersURN: urn:nbn:se:liu:diva-134377OAI: oai:DiVA.org:liu-134377DiVA: diva2:1072608
International Thermal Spray Conference (ITSC), May 10-12, 2016, China