Microstructure evolution and oxidation resistance of plasma sprayed AlSi-doped AlCoCrFeNi coatings with post-annealing

IF 5.3 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2024-10-11 DOI:10.1016/j.surfcoat.2024.131439

Fanyong Zhang , Liangquan Wang , Hongshu Jin , Senlong He , Ying Luo , Detao Zhang , Fuxing Yin

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Abstract

High entropy alloy (HEA) coatings of equimolar AlCoCrFeNi typically exhibit a lower oxidation rate at high temperatures by forming a protective passivation film. However, the metal elements consumption during long-term oxidation limitted the application. In this work, AlCoCrFeNi HEA coatings doped by AlSi as a supplement to passivation elements were prepared by atmospheric plasma spraying (APS), and AlSi capsules were diffused uniformly into the coating through annealing treatment to offset the element consumption during high-temperature oxidation. Results showed that annealing promoted Al and Si atoms diffusing into the solid solution, which stabilized BCC and inhibited FCC formation. During the oxidation at 900 °C, a protective Al₂O₃ film was formed on the coating surface, and AlSi capsules continuously transported Al ions to the consumption zone and reduced oxidation rate to 0.0015 g/cm². The HEA coating doped by passivation element capsules provided a new approach for the design of novel antioxidant coatings.

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等离子喷涂掺硅铝钴铬铁镍涂层后退火的微观结构演变和抗氧化性

等摩尔铝钴铬铁镍高熵合金（HEA）涂层通过形成保护性钝化膜，在高温下通常具有较低的氧化率。然而，长期氧化过程中金属元素的消耗限制了其应用。在这项工作中，通过大气等离子喷涂（APS）制备了掺杂 AlSi 作为钝化元素补充的 AlCoCrFeNi HEA 涂层，并通过退火处理将 AlSi 胶囊均匀扩散到涂层中，以抵消高温氧化过程中的元素消耗。结果表明，退火促进了 Al 原子和 Si 原子扩散到固溶体中，从而稳定了 BCC 并抑制了 FCC 的形成。在 900 °C 的氧化过程中，涂层表面形成了一层 Al2O3 保护膜，AlSi 胶囊不断将 Al 离子输送到消耗区，并将氧化率降低到 0.0015 g/cm2。掺杂了钝化元素胶囊的 HEA 涂层为新型抗氧化涂层的设计提供了一种新方法。

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来源期刊

Surface & Coatings Technology 工程技术-材料科学：膜

CiteScore

10.00

自引率

11.10%

发文量

921

审稿时长

19 days

期刊介绍： Surface and Coatings Technology is an international archival journal publishing scientific papers on significant developments in surface and interface engineering to modify and improve the surface properties of materials for protection in demanding contact conditions or aggressive environments, or for enhanced functional performance. Contributions range from original scientific articles concerned with fundamental and applied aspects of research or direct applications of metallic, inorganic, organic and composite coatings, to invited reviews of current technology in specific areas. Papers submitted to this journal are expected to be in line with the following aspects in processes, and properties/performance: A. Processes: Physical and chemical vapour deposition techniques, thermal and plasma spraying, surface modification by directed energy techniques such as ion, electron and laser beams, thermo-chemical treatment, wet chemical and electrochemical processes such as plating, sol-gel coating, anodization, plasma electrolytic oxidation, etc., but excluding painting. B. Properties/performance: friction performance, wear resistance (e.g., abrasion, erosion, fretting, etc), corrosion and oxidation resistance, thermal protection, diffusion resistance, hydrophilicity/hydrophobicity, and properties relevant to smart materials behaviour and enhanced multifunctional performance for environmental, energy and medical applications, but excluding device aspects.