Influence of creep and cyclic oxidation in thermal barrier coatings
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Philipp Seiler
Abstract
The lifetime of thermal barrier coating systems is limited by cracks close to the interfaces, causing delamination. To study the failure mechanisms, a simplified model system is analysed which consists of a bond-coat bulk material, a thermally grown oxide, and an yttria-stabilised zirconia topcoat. The stresses in the model system are calculated using a finite element model which covers the simulation of full thermal cycles, creep in all layers, and the anisotropic oxidation during dwelling. Creep in the oxide and the thermal barrier coating is varied with the use of different creep parameter sets. The influence of creep in the bondcoat is analysed by using two different bond-coat materials: fast creeping Fecralloy and slow creeping oxide dispersion strengthened MA956. It is shown that creep in the bondcoat influences the lifetime of the coatings. Furthermore, a fast creeping thermally grown oxide benefits the lifetime of the coating system.
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© 2012, Carl Hanser Verlag, München
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Articles in the same Issue
- Contents
- Contents
- Editorial
- Editorial January 2012
- Original Contributions
- High-strength aluminum-based light-weight materials for safety components – recent progress by microstructural refinement and particle reinforcement
- Microstructure – deformation relationships in fine grained high manganese TWIP steel – the role of local texture
- Microstructure of a eutectic NiAl—Mo alloy directionally solidified using an industrial scale and a laboratory scale Bridgman furnace
- Effect of Si addition on the oxidation resistance of Co–Re–Cr-alloys: Recent attainments in the development of novel alloys
- Corrosion behavior of silicon oxycarbide-based ceramic nanocomposites under hydrothermal conditions
- Thermal cycling damage evolution of a thermal barrier coating and the influence of substrate creep, interface roughness and pre-oxidation
- Influence of creep and cyclic oxidation in thermal barrier coatings
- Residual stress states as a result of bending and straightening processes of steels in different heat treatment conditions
- Residual stresses under quasi-static and cyclic loading in shot peened Inconel 718
- Investigation of the surface residual stresses in spray cooled induction hardened gearwheels
- Stress-gradient induced fatigue at ultra high frequencies in sub micron thin metal films
- Influence of graphite spherical size on fatigue behaviour and fracture toughness of ductile cast iron EN-GJS-400-18LT
- Failure behaviour of the superalloy MAR-M247 LC under LCF, HCF and combined LCF/HCF loading
- Measuring techniques for the very high cycle fatigue behaviour of high strength steel at ultrasonic frequencies
- Failure limits of continuous carbon fibre reinforced plastics loaded with fibre parallel compression
- Development of an integrative simulation method to predict the microstructural influence on the mechanical behaviour of semi-crystalline thermoplastic parts
- DGM News
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