Thermal cycling performance and CMAS corrosion behavior of high-entropy composite thermal barrier coatings

IF 6.1 2区材料科学 Q1 MATERIALS SCIENCE, COATINGS & FILMS

Surface & Coatings Technology Pub Date : 2025-09-23 DOI:10.1016/j.surfcoat.2025.132724

Yun Xue , Li Zhao , Haoxin Zhang , Yun Ye , Yulong An

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Abstract

A composite thermal barrier material, Y_0.5LECO, was designed by introducing 50 wt% 8YSZ (8 mol% Yttria-Stabilized Zirconia) into high-entropy (La_0.2Nd_0.2Sm_0.2Eu_0.2Gd_0.2)₂Ce₂O₇ (LECO). Then, two TBCs were constructed via atmospheric plasma spraying, including double-ceramic-layer Y_0.5LECO-8YSZ (Y-Y_0.5LECO) and single-ceramic-layer Y_0.5LECO. The thermal cycling performance and CMAS corrosion behavior were investigated. During thermal cycling, the t → m phase transformation of ZrO₂ was detected. Despite this, the phase transformation toughening and ferroelastic toughening effects of 8YSZ effectively impeded crack propagation and provided excellent cracking resistance. Consequently, Y-Y_0.5LECO (58 thermal cycles, 1000 °C) exhibited a significantly improved thermal cycling performance. The free-standing Y_0.5LECO coating also presented good CMAS resistance, where the corrosion depth was only ~55 μm after corrosion at 1300 °C for 10 h. However, after prolonged corrosion, the corrosion product Ca₂RE₈(SiO₄)₆O₂ phase served as an effective barrier, but the ZrO₂ failed to inhibit CMAS ingress. Thus, the incorporation of 8YSZ resulted in a deterioration of CMAS resistance, at which several elongated penetration paths were generated beneath the corrosion layer. Such a compositional approach establishes a basis for the design of advanced TBCs.

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高熵复合热障涂层的热循环性能和CMAS腐蚀行为

将50wt % 8YSZ （8mol %钇稳定氧化锆）引入高熵（La0.2Nd0.2Sm0.2Eu0.2Gd0.2）2Ce2O7 （LECO）中，设计了复合热障材料Y0.5LECO。然后，采用常压等离子喷涂法制备了双陶瓷层Y0.5LECO- 8ysz （Y-Y0.5LECO）和单陶瓷层Y0.5LECO两种tbc。研究了复合材料的热循环性能和CMAS腐蚀行为。在热循环过程中，检测到ZrO2的t→m相变。尽管如此，8YSZ的相变增韧和铁弹性增韧效果有效地阻止了裂纹扩展，并提供了优异的抗裂性。因此，Y-Y0.5LECO（58个热循环，1000°C）的热循环性能得到了显著改善。独立Y0.5LECO涂层在1300℃腐蚀10 h后也表现出良好的抗CMAS性能，腐蚀深度仅为~55 μm。但在长时间腐蚀后，腐蚀产物Ca2RE8(SiO4)6O2相起到了有效的屏障作用，而ZrO2不能抑制CMAS的进入。因此，8YSZ的掺入导致了CMAS耐蚀性的恶化，在腐蚀层下产生了几条细长的渗透路径。这种组合方法为高级tbc的设计奠定了基础。

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

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.