Hot Corrosion Behavior of La2Ce2O7-Based Plasma-Sprayed Coating

IF 2.1 3区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Oxidation of Metals Pub Date : 2024-04-22 DOI:10.1007/s11085-024-10244-z

S. Ariharan, Milan Parchovianský, Pushpender Singh, Pooja Rani, Rita Maurya, Anusha Sekar, Anup Kumar Keshri, Amirhossein Pakseresht

引用次数: 0

Abstract

La₂Ce₂O₇ (LC) has been identified as a promising thermal barrier coating (TBC) for use up to 1250 °C. In this study, a TBC system was deposited on grit-blasted Inconel 738 using atmospheric plasma spraying (APS) with NiCrAlY as the bond coat, followed by YSZ, and then LC as the top layer. The coatings were exposed to a mixture of molten Na₂SO₄ (45 wt.%) and V₂O₅ (55 wt.%) at 950 °C for hot corrosion. On the top LC layer, LaVO₄, CeVO₄ and CeO_{(1.66–2.00)} formed as hot corrosion products after 4 h exposure. A reaction between YSZ and the corrosion products could not be observed due to the absence of YVO₄. The hot corrosion mechanism of the LC-based TBC is also discussed in this study.

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基于 La2Ce2O7 的等离子喷涂涂层的热腐蚀行为

La2Ce2O7（LC）已被确定为一种很有前途的热障涂层（TBC），其最高使用温度可达 1250 °C。在这项研究中，采用大气等离子喷涂 (APS) 技术在经过喷砂处理的 Inconel 738 上沉积了一种 TBC 系统，以 NiCrAlY 作为结合层，然后是 YSZ，最后以 LC 作为面层。涂层在 950 °C 下暴露于熔融 Na2SO4（45 wt.%）和 V2O5（55 wt.%）的混合物中进行热腐蚀。暴露 4 小时后，在 LC 层的顶层形成了 LaVO4、CeVO4 和 CeO(1.66-2.00) 等热腐蚀产物。由于不存在 YVO4，因此无法观察到 YSZ 与腐蚀产物之间的反应。本研究还讨论了基于 LC 的 TBC 的热腐蚀机理。

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

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