Characterization of TBC Systems with NiPtAl or NiCoCrAlYTa Bond Coatings after Thermal Cycling at 1100°C: A Comparative Study of Failure Mechanisms

Aurélie Vande Put; Djar Oquab; Daniel Monceau

doi:10.4028/www.scientific.net/MSF.595-598.213

Paper Titles

Aluminide Coating Formation on Internal Passages of GTD-111 Superalloy by Slurry Technique
p.185

Enigmatic Moisture Effects on Al₂O₃ Scale and TBC Adhesion
p.191

Phase Field Modeling of Interdiffusion Microstructure in Ni-Cr-Al Diffusion Couples
p.199

Degradation of Yttria Stabilized Zirconia Thermal Barrier Coatings by Molten CMAS (CaO-MgO-Al₂O₃-SiO₂) Deposits
p.207

Characterization of TBC Systems with NiPtAl or NiCoCrAlYTa Bond Coatings after Thermal Cycling at 1100°C: A Comparative Study of Failure Mechanisms
p.213

Depth Distribution of Residual Stress in Graded (Ti, Al) N Coating and Fatigue Properties of Coated Stainless Steel
p.223

Solid Reactions between Enamel and O-Phase Ti-Al-Nb Intermetallics at 800 °C
p.233

Compositional Factors Affecting the Oxidation Behavior of Pt-Modified γ-Ni+γ’-Ni₃Al-Based Alloys and Coatings
p.239

Microstructural Evolution of Slurry Fe Aluminide Coatings during High Temperature Steam Oxidation
p.251

HomeMaterials Science ForumMaterials Science Forum Vols. 595-598Characterization of TBC Systems with NiPtAl or...

Characterization of TBC Systems with NiPtAl or NiCoCrAlYTa Bond Coatings after Thermal Cycling at 1100°C: A Comparative Study of Failure Mechanisms

Abstract:

During service, TBC can suffer degradation by CMAS, FOD, erosion or spallation. Whereas the first three are due to foreign particles, the last one is related to thermal cycling. When subjected to high temperature exposures followed by rapid coolings under oxidizing conditions, a TBC system undergoes morphological changes and stress development. This will initiate cracks which propagate and finally lead to failure by spallation. Consequently, the aim of the present study is to understand better the mechanisms responsible for such spallation events. Two kinds of TBC systems with different bond coatings (NiCoCrAlYTa or Pt-modified nickel aluminide bond coatings) are thermally cycled. Subsequently, SEM investigations on TBC systems after spallation concentrate on failure path, defect, morphological and microstructural changes to propose way for improving TBC system lifetime.