构型熵在提高稀土锆酸盐CMAS耐蚀性中的作用

  • 张石华 ,
  • 丁坤英 ,
  • 董仲伸 ,
  • 于建海 ,
  • 孙宇博 ,
  • 张涛 ,
  • 袁嘉禧 ,
  • 陆锦涛
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  • 1. 中国民航大学天津市民用航空器适航与维修重点实验室
    2. 中国民航大学
    3. 中国南方航空股份有限公司工程技术分公司

收稿日期: 2025-05-27

  修回日期: 2025-08-05

  网络出版日期: 2025-08-11

基金资助

国家重点研发计划资助;中国民航大学研究生科研创新项目

The role of configurational entropy in enhancing CMAS corrosion resistance of rare-earth zirconates

  • ZHANG Shi-Hua ,
  • DING Kun-Ying ,
  • DONG Zhong-Shen ,
  • YU Jian-Hai ,
  • SUN Yu-Bo ,
  • ZHANG Tao ,
  • YUAN Jia-Xi ,
  • LU Jin-Tao
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Received date: 2025-05-27

  Revised date: 2025-08-05

  Online published: 2025-08-11

Supported by

National Key R&D Program of China

摘要

为研究稀土锆酸盐抗CMAS侵蚀性能的影响因素,制备了7种低、中、高熵稀土锆酸盐RExZO (RE= Y, Ho, Dy, Er, Gd, Yb, Tm, x = 1-7),并系统研究其在1300 ℃下的CMAS侵蚀行为。结果表明,稀土锆酸盐材料在高温环境下与CMAS接触后会发生溶解破坏,并生成新的磷灰石相。高熵结构通过“溶解-再沉淀”机制形成了由磷灰石相和萤石相组成的致密反应层,使渗透深度最大值从RE1ZO的80.6 μm显著降低至RE7ZO的30.9 μm(降幅达61.7%)。由于受到离子半径大小的影响,被溶解的稀土元素会呈梯度扩散趋势进入磷灰石相和萤石相。相关性分析结果显示,侵蚀深度与光学碱度差值呈显著正相关,而与构型熵和原子尺寸无序度呈显著负相关(α ≤ 0.05)。结合第一性原理计算和XPS结果进一步证实,高构型熵降低了稀土锆酸盐吉布斯自由能和氧空位浓度,提高了元素结合能,从而增强了材料的结构稳定性。基于研究结论,可以得出设计高耐CMAS侵蚀性能稀土锆酸盐材料的优化策略:应优先考虑低光学碱度差值、高构型熵和高原子尺寸无序度的组合。

本文引用格式

张石华 , 丁坤英 , 董仲伸 , 于建海 , 孙宇博 , 张涛 , 袁嘉禧 , 陆锦涛 . 构型熵在提高稀土锆酸盐CMAS耐蚀性中的作用[J]. 航空学报, 0 : 1 -0 . DOI: 10.7527/S1000-6893.2025.32302

Abstract

To investigate the influencing factors of CMAS corrosion resistance in rare-earth zirconates, seven low-, medium-, and high-entropy rare-earth zirconates RExZO (RE = Y, Ho, Dy, Er, Gd, Yb, Tm; x = 1-7) were prepared, and their CMAS corrosion behaviors at 1300 °C were systematically studied. Results indicate that rare-earth zirconate materials undergo dissolution damage upon contact with CMAS at high temperatures, accompanied by the formation of a new apatite phase. The high-entropy structure facilitated the development of a dense reaction layer composed of apatite and fluorite phases through a "dissolution-reprecipitation" mechanism, significantly reducing the maximum infiltration depth from 80.6 μm for RE1ZO to 30.9 μm for RE7ZO (a 61.7% reduction). Influenced by ionic radius variations, dissolved rare-earth elements exhibited gradient diffusion into the apatite and fluorite phases. Correlation analysis revealed a significant positive relationship between corrosion depth and optical basicity difference, while showing significant negative correlations with configurational entropy and atomic size disorder (α ≤ 0.05). First-principles calculations and XPS results further confirmed that high configurational entropy reduces the Gibbs free energy and oxygen vacancy concentration of rare-earth zirconates while enhancing elemental binding energy, thereby improving structural stability. Based on these findings, an optimization strategy for designing CMAS-resistant rare-earth zirconates is proposed: priority should be given to material combinations featuring low optical basicity difference, high configurational entropy, and high atomic size disorder.

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