航空学报 > 2026, Vol. 47 Issue (5): 432302-432302   doi: 10.7527/S1000-6893.2025.32302

构型熵提高稀土锆酸盐CMAS耐蚀性的作用

张石华1, 丁坤英1(), 董仲伸2, 于建海1, 孙宇博1, 张涛1, 袁嘉禧1, 陆锦涛1   

  1. 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,天津 300300
    2.中国南方航空股份有限公司 工程技术分公司,沈阳 110170
  • 收稿日期:2025-05-27 修回日期:2025-06-30 接受日期:2025-08-04 出版日期:2025-08-12 发布日期:2025-08-11
  • 通讯作者: 丁坤英 E-mail:dingkunying@126.com
  • 基金资助:
    国家重点研发计划(2023YFB4302400)

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

Shihua ZHANG1, Kunying DING1(), Zhongshen DONG2, Jianhai YU1, Yubo SUN1, Tao ZHANG1, Jiaxi YUAN1, Jintao LU1   

  1. 1.Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance,Civil Aviation University of China,Tianjin 300300,China
    2.Engineering & Technology Branch,China Southern Airlines Co. ,Ltd. ,Shenyang 110170,China
  • Received:2025-05-27 Revised:2025-06-30 Accepted:2025-08-04 Online:2025-08-12 Published:2025-08-11
  • Contact: Kunying DING E-mail:dingkunying@126.com
  • Supported by:
    National Key Research and Development Program(2023YFB4302400)

摘要:

为研究稀土锆酸盐抗低熔点氧化物(CMAS)耐蚀性能的影响因素,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1 300 ℃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、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、萤石相。相关性分析结果显示,侵蚀深度与光学碱度差值显著正相关,而与构型熵、原子尺寸无序度显著负相关。结合第一性原理计算、X射线光电子能谱(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、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、高原子尺寸无序度的组合。

关键词: 稀土锆酸盐, 构型熵, CMAS腐蚀, 热障涂层, 高熵陶瓷

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 1 300 ℃ 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 analyses reveal a significant positive relationship between corrosion depth and optical basicity difference, while showing significant negative correlations with configurational entropy and atomic size disorder. First-principles calculations and XPS results further confirm 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.

Key words: rare-earth zirconate, configurational entropy, CMAS corrosion, thermal barrier coating, high-entropy ceramic

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