Hydrothermal corrosion behavior of silicon carbide ceramics with prefabricated indentation-induced cracks

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of the American Ceramic Society Pub Date : 2025-02-24 DOI:10.1111/jace.20453

Yang-Qing Liu, Chuang-Tian Zhan, Wei-Ming Guo, Ze-Xi Zhang, Ying Long, Hua-Tay Lin

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Abstract

The presence of unavoidable microcracks may play a vitally important role in determining the service performance and lifetime of the silicon carbide (SiC) components and parts, and greatly affect the service life under the high-temperature and high-pressure water environment. However, studies on the hydrothermal corrosion behavior with the presence of cracks were rarely reported. In the present work, prefabricated indentation-induced cracks were printed on three SiC samples (solid-phase sintered SiC [SP-SiC], liquid-phase sintered SiC, and chemical vapor deposited SiC) under different applied loads, and the effects of prefabricated cracks on hydrothermal corrosion behavior of the samples in high-temperature water were investigated and compared. The results showed that, with the prefabricated indentation-induced cracks printed under the same applied load, the SP-SiC exhibited the worst hydrothermal corrosion resistance among the three SiC samples studied, in which crack deflection and spalling were easily formed, mainly attributed to the concentrated pores formed around the sintering aid (B + C). These pores formed could be enlarged and lead to accelerated indentation-induced crack propagation under the attack of high-temperature water and also the presence of a high-stress field.

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预制压痕裂纹碳化硅陶瓷的水热腐蚀行为

不可避免的微裂纹的存在对碳化硅（SiC）零部件的使用性能和寿命起着至关重要的作用，对高温高压水环境下的使用寿命有很大影响。然而，对存在裂纹的热液腐蚀行为的研究很少报道。在不同载荷作用下，在固相烧结SiC [SP-SiC]、液相烧结SiC和化学气相沉积SiC三种SiC样品上印制了预制压痕裂纹，研究并比较了预制裂纹对样品在高温水中热液腐蚀行为的影响。结果表明：在相同载荷作用下，预制压痕裂纹的SP-SiC在三种SiC试样中抗水热腐蚀性能最差，容易产生裂纹偏转和剥落；主要原因是助烧剂（B + C）周围形成了集中的孔隙，这些孔隙在高温水和高应力场的作用下会扩大，导致压痕裂纹扩展加速。

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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.