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

N. Mu; Takeshi Izumi; L. Zhang; Brian Gleeson

doi:10.4028/www.scientific.net/MSF.595-598.239

Paper Titles

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

Thermodynamic Modelling of the Corrosive Deposits in Oxy-Fuel Fired Boilers
p.261

Development of a Laboratory-Scale Pilot for Studying Corrosion on MSWI Heat Exchangers
p.271

Fireside Corrosion in Energy Recovery Boilers and Maintenance Issues
p.281

HomeMaterials Science ForumMaterials Science Forum Vols. 595-598Compositional Factors Affecting the Oxidation...

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

Abstract:

Many high-temperature coatings rely on the formation of a continuous and adherent thermally grown oxide (TGO) scale of α-Al2O3 for extended resistance to degradation. For instance, the durability and reliability of thermal barrier coating (TBC) systems in gas turbines are critically linked to the oxidation behavior and stability of an alumina-forming β-NiAl-based bond coat. This study focuses primarily on the development of unique Pt+Hf-modified γ′-Ni3Al+γ-Ni coating compositions that form highly adherent, slow-growing TGO scales during both isothermal and cyclic oxidation at high temperature. Recent findings on the isothermal and cyclic oxidation behavior of γ′+γ alloys and coatings will be discussed, with particular emphasis on the effects of Pt, Al and Hf contents and distributions. Inferred reasons for the observed “Pt effect” will also be presented.