Influence of isothermal and cyclic heat treatments on the adhesion of plasma sprayed thermal barrier coatings
2011 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 205, no 23-24, 5422-5429 p.Article in journal (Refereed) Published
The adhesion of thermal barrier coatings (TBC) has been studied using the standard method described in ASTM C633, which makes use of a tensile test machine to measure the adhesion. The studied specimens consist of air plasma sprayed (APS) TBC deposited on disc-shaped substrate coupons of Ni-base alloy Hastelloy X. The bond coat (BC) is of a NiCoCrAlY type and the top coat (TC) consists of yttria–stabilised–zirconia. Before the adhesion test, the specimens were subjected to three different heat treatments: 1) isothermal oxidation at 1100 °C up to 290 h, 2) thermal cycling fatigue (TCF) at 1100 °C up to 300 cycles and 3) thermal shock at ~ 1140 °C BC/TC interface temperature up to 1150 cycles. The adhesion of the specimens is reported and accompanied by a microstructural study of the BC and the thermally grown oxides (TGO), as well as a discussion on the influence of BC/TC interfacial damage on adhesion properties of TBC. The adhesion was found to vary with heat treatment, as well as with heat treatment length.
Place, publisher, year, edition, pages
Elsevier , 2011. Vol. 205, no 23-24, 5422-5429 p.
Thermal barrier coating, TBC, adhesion, thermal cycling fatigue, thermal shock, burner rig test
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-67882DOI: 10.1016/j.surfcoat.2011.06.007ISI: 000294103700025OAI: oai:DiVA.org:liu-67882DiVA: diva2:414005