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Assessment of the Oxidation Behavior of a Pt-Based Alloy for High Temperature Applications

机译：高温应用中Pt基合金的氧化行为评估

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摘要

Pt-based alloys are being developed as a possible future replacement for Ni-based superalloy components in the hottest section of turbine engines. The critical properties of these alloys are their ability to withstand higher thermal and mechanical stresses as well as to resist aggressive corrosive and oxidizing environments in applications. Oxidation properties of these alloys were investigated between 1150 and 1350℃. The surface roughness of the as-polished samples was determined using atomic force microscopy, while the microstructures of both the as-polished and oxidized samples were examined using scanning electron microscopy. The alloy was found to be composed of a two-phase gamma/gamma prime microstructure, while the average surface roughness decreased from 5.78 nm after 1 μm diamond paste polishing to 4.13 nm with 0.25 μm diamond paste polishing. Microstructure examination of the oxidized alloy samples revealed the formation of compact and protective external oxide scale composed of α-alumina, as confirmed by the XRD and Raman spectroscopy. The results also showed that the oxide scale thickens with increased exposure time and temperatures according to parabolic kinetics. It was concluded from the results that the Pt-based alloys possess good oxidation resistance and thus will be suitable for high temperature applications, such as turbine engines.
机译：目前正在开发Pt基合金，以替代涡轮发动机最热部分中的Ni基高温合金部件。这些合金的关键特性是它们能够承受更高的热应力和机械应力，以及在应用中抵抗侵蚀性腐蚀和氧化环境的能力。研究了这些合金在1150至1350℃之间的氧化性能。使用原子力显微镜确定抛光后样品的表面粗糙度，同时使用扫描电子显微镜检查抛光后和氧化后的样品的微观结构。发现该合金由两相伽马/伽马素显微组织组成，而平均表面粗糙度从1μm金刚石浆料抛光后的5.78 nm降低到0.25μm金刚石浆料抛光后的4.13 nm。 XRD和拉曼光谱法证实，氧化合金样品的微观结构检查显示形成了由α-氧化铝组成的致密保护性外部氧化皮。结果还表明，根据抛物线动力学，氧化皮会随着暴露时间和温度的增加而增厚。从结果可以得出结论，Pt基合金具有良好的抗氧化性，因此将适用于高温应用，例如涡轮发动机。

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