Thermal cycling, oxidation behaviour and mechanical properties of graded and duplex PSZ TBC coatings
- SKODA, Plzen (Czech Republic)
- Univ. of Karlsruhe (Germany)
Plasma sprayed duplex and graded ZrO{sub 2} thermal barrier coatings (TBCs) on an Inconel 617 substrate with a NiCrAlY bond coat were investigated and compared with regard to their thermal cycling, oxidation behaviour and mechanical properties. On the basis of FE - calculations the stress distribution within thermally cycled coating systems was analyzed. The calculations show that the graded coating structure relaxes considerably the stresses resulting from the internal constraint due to thermal expansion difference between both metallic and ceramic materials and hence must lead to a better thermal cycling behaviour of the graded TBC systems. Mechanical tests confirm it. However, taking into account their poor oxidation behaviour, the lifetime of duplex TBC systems which are under steady-state thermal load conditions is much higher than that of graded ones.
- Research Organization:
- International Union of Pure and Applied Chemistry; American Physical Society, New York, NY (United States)
- OSTI ID:
- 223697
- Report Number(s):
- CONF-950875--Vol.2
- Country of Publication:
- United States
- Language:
- English
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