采用非等摩尔组分设计提高RE2Si2O7耐CMAS腐蚀性能

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2025-09-26 DOI:10.1016/j.corsci.2025.113365

Siyu Hu , Xin Zhong , Yiming Wu , Xuemei Song , Du Hong , Liping Huang , Yaran Niu , Xuebin Zheng

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引用次数: 0

摘要

稀土硅酸盐（RE2Si2O7）环境屏障涂层（ebc）在高温环境下面临着钙镁铝硅酸盐（CMAS）熔融沉积的严重降解。本研究提出了一种通过设计非等摩尔稀土元素来提高RE2Si2O7耐CMAS腐蚀性能的策略。通过固相反应合成了四种（nRExi）2Si2O7 ((Yb0.8Er0.1Y0.1)2Si2O7, (Yb0.8Er0.1Tm0.1)2Si2O7, (Yb0.7Er0.1Tm0.1Y0.1)2Si2O7, (Yb0.7Er0.1Tm0.1Ho0.1)2Si2O7)，并在1400℃下进行了4和25 h的CMAS腐蚀。所有组分在1600℃以下均保持热稳定的β相。CMAS腐蚀结果表明，与Yb2Si2O7相比，多稀土成分设计显著促进了磷灰石产物的形成，连续的产物层是阻挡CMAS渗透的有效屏障。RE3 +阳离子的种类及其在（nRExi）2Si2O7中的化学计量比例对CMAS的耐蚀性均有显著影响。腐蚀25 h后，（Yb0.8Er0.1Tm0.1）2Si2O7表现出优异的性能，形成致密、连续的磷灰石层，抑制了CMAS的渗透。腐蚀机制包括RE3+溶解、磷灰石析出和Ca/Si比演变。非等摩尔多重稀土掺杂提高了晶格稳定性，减少了畸变，优化了热力学动力学平衡，为调节稀土硅酸盐的腐蚀性能提供了一种有效的方法。

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Improving CMAS corrosion resistance of RE2Si2O7 by non-equimolar component design

Rare-earth disilicates (RE₂Si₂O₇) environmental barrier coatings (EBCs) face severe degradation from molten calcium-magnesium-aluminosilicate (CMAS) deposits in high-temperature environments. This study proposes a strategy to improve the CMAS corrosion resistance of RE₂Si₂O₇ through the design of non-equimolar rare-earth elements. Four kinds of (nRE_xi)₂Si₂O₇ ((Yb_0.8Er_0.1Y_0.1)₂Si₂O₇, (Yb_0.8Er_0.1Tm_0.1)₂Si₂O₇, (Yb_0.7Er_0.1Tm_0.1Y_0.1)₂Si₂O₇, (Yb_0.7Er_0.1Tm_0.1Ho_0.1)₂Si₂O₇) were synthesized via solid-state reactions and subjected to CMAS corrosion at 1400 ℃ for 4 and 25 h. All compositions retained the thermodynamically stable β-phase up to 1600 ℃. The CMAS corrosion results indicated that compared to Yb₂Si₂O₇, the multi-rare-earth composition design significantly improves the formation of apatite products, and the continuous product layer is an effective barrier against CMAS penetration. The corrosion resistance against CMAS was significantly influenced by both the types of RE^3 + cations and their stoichiometric proportions in (nRE_xi)₂Si₂O₇. After corrosion for 25 h, (Yb_0.8Er_0.1Tm_0.1)₂Si₂O₇ demonstrated exceptional performance, forming a dense, continuous apatite layer that suppressed CMAS infiltration. The corrosion mechanism involved RE³⁺ dissolution, apatite precipitation, and Ca/Si ratio evolution. The non- equimolar multiple rare-earth doping enhanced lattice stability and reduced distortion optimizing the thermodynamic-kinetic balance, providing an effective method for modulating the corrosion properties of rare-earth silicates used as EBCs.

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.