Evaluation of AlCoCrFeNiTi-high entropy alloy (HEA) as top coat material in thermal barrier coating (TBC) system and investigation of its high temperature oxidation behavior

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

Surface & Coatings Technology Pub Date : 2024-11-17 DOI:10.1016/j.surfcoat.2024.131569

Okan Odabas , Abdullah Cahit Karaoglanli , Yasin Ozgurluk , Gulfem Binal , Dervis Ozkan

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引用次数: 0

Abstract

To obtain compatible properties of high-temperature performance and mechanical strength properties, AlCoCrFeNiTi high-entropy alloy (HEA) was designed as a new candidate material for metal-based thermal barrier coating (TBC) systems. The aim of this study is to investigate potential applications of AlCoCrFeNiTi-HEA as a coating material for TBC systems and to determine its behavior under high temperature conditions. CoNiCrAlY bond coatings were produced on the Inconel-718 substrate surface using high-velocity oxygen fuel (HVOF) technique. AlCoCrFeNiTi-HEAs were produced on CoNiCrAlY bond coatings using atmospheric plasma spray (APS) technique and a typical TBC system structure was obtained. The produced AlCoCrFeNiTi-HEA TBC system was exposed to oxidation at temperatures of 1000 °C and 1100 °C for time periods of 5 h, 25 h, 50 h and 100 h in order to determine the oxidation resistance under isothermal conditions and to investigate formation and growth behavior of oxide structures formed at the coating interface. As a result of oxidation tests, the growth behavior of the thermally grown oxide (TGO) layer formed between the coating interfaces and the microstructural changes occurring in the coating system were investigated depending on temperature and time processes. In the TBC system with Ti-containing HEA content, a transformation from body-centered cubic (BCC) structure to rhombohedral crystal lattice structure occurred as a result of increasing temperature. Many spinel compound forms were formed at the coating interface. It was observed that the coating system with AlCoCrFeNiTi-HEA content maintained its structural integrity without any damage such as microstructural and mechanical spalling and cracking under conditions of high temperature and different time periods.

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铝钴铬铁镍钛高熵合金 (HEA) 作为热障涂层 (TBC) 系统面层材料的评估及其高温氧化行为研究

为了获得高温性能和机械强度性能的兼容特性，人们设计了铝钴铬铁镍钛高熵合金（HEA），作为金属基热障涂层（TBC）系统的新候选材料。本研究旨在调查铝钴铬铁镍钛高熵合金作为 TBC 系统涂层材料的潜在应用，并确定其在高温条件下的行为。采用高速氧气燃料（HVOF）技术在 Inconel-718 基体表面生产了 CoNiCrAlY 键涂层。使用大气等离子喷涂（APS）技术在 CoNiCrAlY 键涂层上生成了 AlCoCrFeNiTi-HEAs 并获得了典型的 TBC 系统结构。为了确定等温条件下的抗氧化性，并研究涂层界面上形成的氧化物结构的形成和生长行为，将制得的铝钴铬铁镍钛-氢氧化物 TBC 系统暴露在 1000 ℃ 和 1100 ℃ 的温度下进行了 5 小时、25 小时、50 小时和 100 小时的氧化试验。根据氧化试验的结果，研究了涂层界面之间形成的热生长氧化物（TGO）层的生长行为以及涂层体系中发生的微观结构变化（取决于温度和时间过程）。在含钛 HEA 的 TBC 系统中，随着温度的升高，发生了从体心立方（BCC）结构到斜方晶格结构的转变。在涂层界面上形成了许多尖晶石化合物形态。据观察，含 AlCoCrFeNiTi-HEA 的涂层体系在高温和不同时间段的条件下保持了结构的完整性，没有出现任何损坏，如微观结构和机械剥落和开裂。

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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.