Understanding oxidation resistance of Pt-based alloys through computations of Ellingham diagrams with experimental verifications

Abstract

Thermodynamic calculations of Ellingham diagrams and the forming oxides have been performed relevant to the Pt-based alloys Pt₈₂Al₁₂M₆ (M = Cr, Hf, Pt, and Ta). The predicted Ellingham diagrams indicate that the elements Hf and Al are easy to oxidize, followed by Ta and Cr, while Pt is extremely difficult to oxidize. Oxidation experiments characterized by X-ray diffraction (XRD) and electron probe micro-analyzers verify the present thermodynamic predictions, showing that the best alloy with superior oxidation resistance is Pt₈₂Al₁₂Cr₆, followed by Pt₈₈Al₁₂ due to the formation of the dense and continuous α-Al₂O₃ scale on the surface of alloys; while the worse alloy is Pt₈₂Al₁₂Hf₆ followed by Pt₈₂Al₁₂Ta₆ due to drastic internal oxidation and the formation of deleterious HfO₂, AlTaO₄, and Ta₂O₅. The present work, combining computations with experimental verifications, provides a fundamental understanding and knowledgebase to develop Pt-based superalloys with superior oxidation resistance that can be used in ultra-high temperatures.

Keywords

Ellingham diagrams / Pt-based alloys / oxidation resistance / XRD / EPMA

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