Oxidation behaviour of uncoated and PDC-SiAlOC glass-coated TiAl at 750 °C in dry and humid air
Maciej Bik, Mathias C. Galetz, L. Mengis, Emma White, Wojciech Wieczorek, Klaudia Łyszczarz, Krzysztof Mroczka, Jakub Marchewka, Maciej Sitarz
Abstract
In this work polymer derived ceramic (PDC) coatings, based on SiAlOC glasses, were successfully applied on 48-2-2 TiAl alloy samples. These coatings showed a significant improvement in oxidation resistance in both dry and humid air conditions. The uncoated 48-2-2 TiAl alloy material showed poor oxidation resistance independent of the atmosphere. SEM, EPMA and Raman confocal imaging were used to investigate the oxidation mechanisms of the uncoated and coated 48-2-2 TiAl alloy in dry and humid air. The coating suppressed outward Ti diffusion and promoted alumina scale formation.
Topics & Concepts
Materials scienceAlloyElectron microprobeCoatingRaman spectroscopyDiffusionCeramicMetallurgyComposite materialPhysicsThermodynamicsOpticsAdvanced ceramic materials synthesisIntermetallics and Advanced Alloy PropertiesHigh-Temperature Coating Behaviors