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.
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