Thermomechanical behaviour of thin oxide coatings

Marewski, Ulrich; Stöver, D.; Hecker, R.

doi:10.1016/0257-8972(91)90149-q

Cited by 7 publications

(1 citation statement)

References 5 publications

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“…The resulting bending moment causes the layered composite to bend in order for it accommodate the thermal stresses. Away from the edges, the in-plane stress (parallel to the interface) is typically compressive in the ceramic layer (due to the smaller CTE of ceramic) and tensile in the metallic layer [2,3]. Tensile residual stresses in the ceramic coating cause perpendicular microcracking while compressive stresses tend to promote microcrack propagation at the interface [4,5,6].…”

Section: Introductionmentioning

confidence: 99%

Modelling of Thermal Residual Stresses in Ceramic Coatings with a Graded Composite Interlayer

Teixeira

Andritschky

Stöver

1998

Advanced Multilayered and Fibre-Reinforced Composites

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Abstract. The present contribution involves numerical modelling of the residual stress distribution within a multilayered coating system which consists of a functionally gradient material (FGM). The structure of the graded system is made of a ceramic layer and a metallic layer, where between them there is an interlayer which is a graded composite made of the metal and ceramic. The composition changes gradually from 0% ceramic to 100% ceramic. This graded composite interlayer was modelled as a serie of perfectly bonded finite thin layers, each having slightly different material properties. We analyse the FGM design with respect to thermal stress optimization (e.g. reduction of the interfacial stresses). The case of a bilayer, thick ceramic coating on a metallic substrate and a graded thermal barrier coating (TBC) is considered. The effects on thermal residual stress gradients of the compositional profiles and graded interlayer thickness were studied. This FGM stress model enables us to calculate the thermal strain and stress distributions, which contributes to a better understanding of the failure of a graded coating system and is, therefore, a potential tool for FGM stress optimization to improve the thermo-mechanical stability of multilayer graded structures such as high temperature ceramic coatings for use in thermal barrier applications.

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