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pubblicazioni - Presentazione

TBC Microstructural Characterisation and Integrity Assessment by Photothermal and Thermographic Techniques

pubblicazioni - Presentazione

TBC Microstructural Characterisation and Integrity Assessment by Photothermal and Thermographic Techniques

E’ una conferenza internazionale focalizzata sui rivestimenti delle parti calde delle moderne turbine a gas, argomento che abbiamo trattato nella RdS e che è oggetto della nostra attività nell’ambito del progetto europeo H2IGCC (correlato alla CCS nella RdS 2009-2011).

For thin (<200 micron) air plasma spray (APS) and electron beam physical vapor deposition (EBPVD) ceramic thermal barrier coatings (TBCs), some non-destructive techniques indicate damage at the bond coat- TBC interface during either ageing or cyclic oxidation tests. However, no technique is available for thick (>200 micron) APS TBCs. In this work, a semi-quantitative estimation of cracks at the interface of TBCs is obtained from thermal diffusivity values measured on coupons subjected to thermal cycling by using a single side thermographic technique. In fact, during thermal cycling, two phenomena occur: sintering that promotes a significant increase of thermal diffusivity, and cracking that, representing an additional thermal resistance, causes an apparent decrease of thermal diffusivity. The idea presented hereinafter consists in removing the effects of sintering from apparent thermal diffusivity to estimate cracking at the interface.

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