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Assessment of TBC oxidation-induced degradation using compression tests

Luc Rémy 1 Catherine Guerre 2 Isabelle Rouzou 1 Régine Molins 1 
2 LECA - Laboratoire d'Etude de la Corrosion Aqueuse
SCCME - Service de la Corrosion et du Comportement des Matériaux dans leur Environnement : DEN/DPC/SCCME/LECA
Abstract : Compression tests at room temperature are used to estimate the critical strain to spallation of EBPVD thermal barrier coating deposited on Ni based single crystals for blades used in aero-engines. The observation of fracture surfaces allows for investigating the location of delamination events leading to spallation, the eventual porosity at bond coat-alumina interface and kinetics of damage evolution. The effect of isothermal oxidation at 1,100 °C is presented for standard or low sulfur AM1 superalloy, and coating process variants. The degradation is shown to depend on the thermal-mechanical loading and varies from isothermal oxidation, cyclic oxidation and thermal-mechanical fatigue with hold time. These observations are consistent with the damage observed in blades in engine tests or in service. These tests are a useful complement to standard cyclic oxidation tests to identify engineering lifetime models.
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Submitted on : Friday, February 21, 2014 - 3:38:06 PM
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Luc Rémy, Catherine Guerre, Isabelle Rouzou, Régine Molins. Assessment of TBC oxidation-induced degradation using compression tests. Oxidation of Metals, Springer Verlag, 2014, 81, pp.3-15. ⟨10.1007/s11085-013-9416-9⟩. ⟨hal-00950532⟩



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