Pt Effect on the Bond-Coating/Superalloy Interdiffusion: Case of a Pt-Modified NiCoCrAlYTa Coating

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING Oxidation of Metals Pub Date : 2024-09-23 DOI:10.1007/s11085-024-10314-2

Aurélie Vande Put, Enrica Epifano, Fabrice Crabos, Daniel Monceau

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Abstract

Heat treatments and oxidation tests were performed on systems composed of a single-crystal AM3 superalloy with a NiCoCrAlYTa+Pt coating to investigate the effect of Pt on Ta and Ti diffusion at high temperature. Experimental results were compared to an AM3 superalloy directly coated with Pt. For all the studied systems, the effect of Pt on elemental activities was evaluated through thermodynamic calculations. Pt diffusion was found to be faster in the NiCoCrAlYTa coating than in AM3. High Ta contents were measured in the Pt-rich γ′ phase below the surface and significant Al and Cr transport toward the surface was observed, in agreement with thermodynamic calculations which predicted an important decrease in their activities in the presence of Pt. An outward diffusion of Ti was also noticed, whereas calculations did not show a decrease in Ti activity due to Pt. Other discrepancies between experiments and thermodynamic calculations were noted and are discussed in this work.

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铂对粘结涂层/超合金相互扩散的影响：铂改性镍钴铬铝钽涂层案例

对由单晶 AM3 超合金和 NiCoCrAlYTa+Pt 涂层组成的体系进行了热处理和氧化试验，以研究铂在高温下对 Ta 和 Ti 扩散的影响。实验结果与直接镀有铂的 AM3 超合金进行了比较。对于所有研究体系，铂对元素活性的影响都是通过热力学计算进行评估的。与 AM3 相比，铂在 NiCoCrAlYTa 涂层中的扩散速度更快。在表面以下富含铂的γ′相中测得了较高的钽含量，并观察到铝和铬向表面的大量迁移，这与热力学计算结果一致，热力学计算结果预测在有铂存在的情况下，铝和铬的活性会大大降低。实验还发现了钛向外扩散的现象，而计算结果并未显示铂会导致钛活性降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Oxidation of Metals 工程技术-冶金工程

CiteScore

5.10

自引率

9.10%

发文量

审稿时长

2.2 months

期刊介绍： Oxidation of Metals is the premier source for the rapid dissemination of current research on all aspects of the science of gas-solid reactions at temperatures greater than about 400˚C, with primary focus on the high-temperature corrosion of bulk and coated systems. This authoritative bi-monthly publishes original scientific papers on kinetics, mechanisms, studies of scales from structural and morphological viewpoints, transport properties in scales, phase-boundary reactions, and much more. Articles may discuss both theoretical and experimental work related to gas-solid reactions at the surface or near-surface of a material exposed to elevated temperatures, including reactions with oxygen, nitrogen, sulfur, carbon and halogens. In addition, Oxidation of Metals publishes the results of frontier research concerned with deposit-induced attack. Review papers and short technical notes are encouraged.

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