Strain analysis of plasma sprayed thermal barrier coatings under mechanical stress |
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Authors: | T Wakui J Malzbender R W Steinbrech |
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Affiliation: | (1) Institute for Materials and Processes in Energy Systems, Forschungszentrum Jülich, D-52428 Jülich, Germany |
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Abstract: | The stiffness of air plasma sprayed (APS) thermal barrier coatings (TBCs) was determined from bending experiments combining
strain analysis on a microstructural level with macroscopic mechanical parameters. Tests were performed with freestanding
and attached TBCs, the latter either loaded in tension or in compression. Relationships are derived, which describe the TBC
stiffness in a multilayer composite (attached TBC) and for a bimodular material that possess a lower stiffness in tension
than in compression (stand-alone TBC). The increase of in-plane stiffness with increasing compressive stress emphasizes the
importance of the spraying defects for the elastic response of the coating. |
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Keywords: | bending test stiffness strain thermal barrier coating (TBC) |
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