Cobalt- and Chromium-Oxide-Based Coatings: Thermally Spraying a Glaze Layer

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL Tribology Letters Pub Date : 2024-10-26 DOI:10.1007/s11249-024-01927-4
Andre R. Mayer, Bruno C. N. M. de Castilho, Fadhel B. Ettouil, Richard R. Chromik, Christian Moreau, Pantcho P. Stoyanov
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Abstract

The recent demand for more efficient gas turbine engines has led to a growing need for new high performance materials and engineered surfaces. Consequently, there has been recent development of thermally sprayed coatings capable of withstanding harsh environments to advance these engines. For instance, oxide-based coatings exhibit high temperature stability, making them potential coating candidates for applications at elevated temperatures, thereby further improving gas turbine engines' efficiency. In particular, cobalt- and chromium- based oxides have previously been shown to be beneficial in terms of reducing friction and wear in high temperature environments. However, limited work has been performed on the deposition of such coatings by means of thermal spray processes. Therefore, the main purpose of this study is to develop and critically evaluate thermally sprayed cobalt- and chromium-based coatings for extreme environments. More specifically, the coatings were deposited by means of suspension plasma spray (SPS) and characterized before and after ball-on-flat tests at different temperatures. The coatings developed in this study have demonstrated high resistance to wear when tested against IN718. In all cases, most of the wear was observed on the counterballs. The CoO coating exhibited the lowest combined wear when compared to the other coatings. Ex-situ Raman analysis revealed the formation of Co3O4 for the worn cobalt oxide-based coatings tested at 450 °C, which correlates well with the lower wear rates.

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钴基和氧化铬基涂层:热喷涂釉层
最近,对更高效燃气涡轮发动机的需求导致对新型高性能材料和工程表面的需求日益增长。因此,最近开发出了能够承受恶劣环境的热喷涂涂层,以推动这些发动机的发展。例如,氧化物涂层具有高温稳定性,使其成为在高温下应用的潜在涂层候选材料,从而进一步提高燃气涡轮发动机的效率。特别是钴基和铬基氧化物,以前的研究表明,它们在高温环境下有利于减少摩擦和磨损。然而,通过热喷涂工艺沉积此类涂层的工作还很有限。因此,本研究的主要目的是开发和严格评估适用于极端环境的热喷涂钴基和铬基涂层。更具体地说,涂层是通过悬浮等离子喷涂(SPS)沉积的,并在不同温度下进行球对扁测试前后进行了表征。本研究中开发的涂层在与 IN718 的测试中表现出很高的耐磨性。在所有情况下,大部分磨损都发生在反球上。与其他涂层相比,CoO 涂层的综合磨损最小。原位拉曼分析显示,在 450 °C 下测试的磨损的氧化钴涂层形成了 Co3O4,这与较低的磨损率密切相关。
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
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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