Enhanced hydrothermal corrosion resistance in SiC/SiC joints with CaO-modified Y-Al-Si-O interlayer under PWR condition

IF 3.8 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-07-30 DOI:10.1111/jace.70119

Shaobo Yang, Xian Liu, Chenxi Liang, Jiali Li, Yujie Ma, Sijie Kou, Juanli Deng, Bo Chen, Shangwu Fan

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Abstract

The study investigated the hydrothermal corrosion behavior of Y₂O₃-Al₂O₃-SiO₂ (YAS) and CaO-Y₂O₃-Al₂O₃-SiO₂ (CYAS) glass interlayers in SiC/SiC composite joints under simulated pressurized water reactor (PWR) conditions and evaluated their effects on mechanical performance. The corrosion rate of the YAS joint was ∼2.7 mg/(cm²·day), primarily due to the rapid dissolution of SiO₂, which triggered pitting corrosion and void formation. While the Y₂Si₂O₇ exhibited good stability, degradation of the glass network caused the hydrolysis of Al species, forming stable AlO(OH) corrosion products. These processes severely damaged the structural integrity, reducing shear strength to ∼6 ± 2 MPa after 15 days, making it unsuitable for application. In contrast, the CYAS joint showed superior corrosion resistance, with a corrosion rate of ∼0.16 mg/(cm²·day), only 2.2% of the YAS joint. The CYAS joint maintained structural integrity and interface bonding. During corrosion, Y₂Si₂O₇ crystals formed, while a layer of corrosion intermediates covered and eventually transformed into AlO(OH) particles. After 25 days, shear strength remained at 26 ± 2 MPa, still satisfying service requirements. The hydrothermal corrosion mechanism of YAS-based glasses basically involved the breakdown of the glass network and formation of stable products, including Y₂Si₂O₇ and AlO(OH).

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采用cao修饰的Y-Al-Si-O中间层增强SiC/SiC接头在压水堆条件下的抗水热腐蚀性能

在模拟压水堆（PWR）条件下，研究了Y2O3-Al2O3-SiO2 （YAS）和CaO-Y2O3-Al2O3-SiO2 （CYAS）玻璃夹层在SiC/SiC复合材料接头中的热液腐蚀行为，并评价了它们对力学性能的影响。YAS接头的腐蚀速率为~ 2.7 mg/(cm2·day)，主要是由于SiO2的快速溶解导致点蚀和空洞的形成。虽然Y2Si2O7具有良好的稳定性，但由于玻璃网络的降解，导致Al种水解，形成稳定的AlO（OH）腐蚀产物。这些过程严重破坏了结构完整性，15天后抗剪强度降至~ 6±2 MPa，使其不适合应用。相比之下，CYAS接头表现出更强的耐蚀性，腐蚀速率为~ 0.16 mg/(cm2·day)，仅为YAS接头的2.2%。CYAS接头保持了结构的完整性和界面的结合。在腐蚀过程中，形成Y2Si2O7晶体，同时一层腐蚀中间体覆盖并最终转化为AlO（OH）颗粒。25天后，抗剪强度保持在26±2 MPa，仍能满足使用要求。yas基玻璃的热液腐蚀机理主要涉及玻璃网络的破坏和稳定产物的形成，包括Y2Si2O7和AlO（OH）。

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来源期刊

Journal of the American Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

7.50

自引率

7.70%

发文量

590

审稿时长

2.1 months

期刊介绍： The Journal of the American Ceramic Society contains records of original research that provide insight into or describe the science of ceramic and glass materials and composites based on ceramics and glasses. These papers include reports on discovery, characterization, and analysis of new inorganic, non-metallic materials; synthesis methods; phase relationships; processing approaches; microstructure-property relationships; and functionalities. Of great interest are works that support understanding founded on fundamental principles using experimental, theoretical, or computational methods or combinations of those approaches. All the published papers must be of enduring value and relevant to the science of ceramics and glasses or composites based on those materials. Papers on fundamental ceramic and glass science are welcome including those in the following areas: Enabling materials for grand challenges[...] Materials design, selection, synthesis and processing methods[...] Characterization of compositions, structures, defects, and properties along with new methods [...] Mechanisms, Theory, Modeling, and Simulation[...] JACerS accepts submissions of full-length Articles reporting original research, in-depth Feature Articles, Reviews of the state-of-the-art with compelling analysis, and Rapid Communications which are short papers with sufficient novelty or impact to justify swift publication.