Some aspects of elemental behaviour in HVOF MCrAlY coatings in high-temperature oxidation
2015 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 261, 86-101 p.Article in journal (Refereed) Published
MCrAlY coatings are widely used to protect superalloys against oxidation and corrosion at high temperature in gas turbine engines. To design a durable MCrAlY coating, the elemental behaviour in coating-superalloy couples needs to be better understood. After oxidation tests in temperature range between 900 °C to 1100 °C, the microstructural development in the samples were analysed. The investigation was mainly focused on the microstructures at the coating surface or in areas near the coating-superalloy interface. Some interdiffusion simulations were also done to model the diffusion behaviour of alloying elements in different coatingsuperalloy couples. The results showed that both oxidation at the coatings’ surfaces and the elements’ diffusion inside of the materials were temperature- and chemical-composition dependent. The behaviour of some minor elements like Y, Hf, Ru and Ir in the oxidation processes was particularly studied by tracking their position and composition in the materials.
Place, publisher, year, edition, pages
2015. Vol. 261, 86-101 p.
MCrAlY; oxidation; interdiffusion; elemental behaviour
IdentifiersURN: urn:nbn:se:liu:diva-111116DOI: 10.1016/j.surfcoat.2014.11.053ISI: 000348255500012OAI: oai:DiVA.org:liu-111116DiVA: diva2:753477
On the day of the defence date the status of this article was Manuscript.2014-10-082014-10-082015-04-13Bibliographically approved