New perspective on the role of grain boundaries for hot-corrosion studies on sintered 3YSZ ceramic

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

Journal of the American Ceramic Society Pub Date : 2024-11-18 DOI:10.1111/jace.20263

Spandan Prasad Sahu, Himirkanti Sarkar, Lakshaman Kumar, Anirban Chowdhury

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Abstract

The hot-corrosion behavior of sintered 3 mol.% yttria-stabilized zirconia (3YSZ) ceramic with significant (1:4 in ratio) variation in grain sizes was investigated. Contrary to the popular perception of the role of grain boundaries, ceramics with smaller grains portrayed remarkable hot-corrosion resistance despite having ∼450% more grain boundaries compared to their counterpart. The mechanism behind a rather ‘unusual’ role of the grain boundary in deciding the corrosion pathways for 3YSZ ceramic systems was examined. The affinity of NaVO₃ to react with Y₂O₃ was found to be a crucial step for the initiation of corrosion and this process had no potential influence on the fraction of grain boundaries in the system. A phase transformation (tetragonal to monoclinic) induced porosity created easy path for the molten liquid to flow inside the ZrO₂ matrix. The ceramic with a smaller grain size resisted such a transformation and resulted in a much lower penetration depth for the corrosion to proceed further inside the matrix. Although grain boundaries are usually portrayed as weak points for corrosion, this study illustrates an alternate pathway using which corrosion can be averted in a fine grained 3YSZ ceramic.

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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.