Fast crack healing in glass-matrix composites with rigid filler percolation frameworks

IF 3.5 3区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of the American Ceramic Society Pub Date : 2025-01-30 DOI:10.1111/jace.20386

Carsten Blaeß, Ralf Müller

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Abstract

To ensure the durability of solid oxide fuel cell sealants, the understanding of the microstructural influence on viscous crack healing is essential. To this end, the effect of microstructure with respect to the spatial distribution of filler particles on viscous crack healing was studied with confocal laser scanning microscopy in glass-matrix composites (GMCs) made by mix-milling and sintering of soda-lime magnesium silicate glass and Φ ≈ 6 vol% ZrO₂ chemically inert rigid filler particles. This way, no change in Φ occurred during the crack healing treatments studied on Vickers indentation-induced radial cracks in polished GMC surfaces. Different microstructures were mimicked using different ZrO₂ particle sizes for mix-milling. Unlike coarse ZrO₂ particles, similar in size to the glass particle, fine ZrO₂ particles, much smaller than the glass particles, form a rigid percolation framework (RPF) of ZrO₂ filler particles around the former glass particles or glass particle agglomerates. For this RPF microstructure, crack healing was observed more readily as crack healing retardation phenomena like large-scale crack widening and crack tip rounding were strongly reduced, whereas narrow cracks could still heal locally within the glassy regions.

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具有刚性填料渗流框架的玻璃基复合材料的快速裂纹愈合

为确保固体氧化物燃料电池密封剂的耐用性，了解微观结构对粘性裂纹愈合的影响至关重要。为此，我们使用激光共聚焦扫描显微镜研究了填料颗粒空间分布对玻璃基复合材料（GMC）粘性裂纹愈合的影响，该复合材料是由钠钙硅酸镁玻璃和Φ ≈ 6 vol% ZrO2 化学惰性刚性填料颗粒混合研磨烧结而成。这样，在对抛光 GMC 表面维氏压痕诱发的径向裂纹进行裂纹愈合处理研究时，Φ 不会发生变化。使用不同大小的 ZrO2 颗粒进行混合研磨，可模拟出不同的微观结构。与尺寸与玻璃颗粒相似的粗 ZrO2 颗粒不同，尺寸比玻璃颗粒小得多的细 ZrO2 颗粒会在前玻璃颗粒或玻璃颗粒团聚体周围形成由 ZrO2 填料颗粒组成的刚性渗滤框架 (RPF)。对于这种 RPF 显微结构，裂纹愈合更容易观察到，因为裂纹愈合延迟现象（如大尺度裂纹扩大和裂纹尖端变圆）大大减少，而狭窄裂纹仍可在玻璃状区域内局部愈合。

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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.