Thermo-mechanical damage of Al2O3-C reticulated porous ceramic and effect of functional coatings

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Journal of The European Ceramic Society Pub Date : 2025-05-01 Epub Date: 2024-12-25 DOI:10.1016/j.jeurceramsoc.2024.117174

Yajie Dai , Jiajun Zhang , Haodong Wu , Enrico Storti , Jana Hubálková , Qingsheng Bai , Heinz Konietzky , Yawei Li , Christos G. Aneziris

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Abstract

Thermo-mechanical performance of carbon-bonded alumina filters is essential for guaranteeing their structural stability and filtration capability. This work investigates the Mode I fracture of Al₂O₃-C porous ceramic as well as the influence of reticulate structure and coatings (alumina and carbon-bonded calcium hexaluminate). The cylindrical splitting test is validated for evaluating the strength of foam and individual strut. DIC and AE techniques were applied to monitor tensile failure induced by compressive loading. The results showed central crack propagation and continuous AE signal release caused by localized damage. Generally, the mechanical strength increases with pore density and the application of alumina coating. This improvement results from more continuous stress transmission and better sintered struts. However, calcium hexaluminate coating is less effective for strengthening foams at room temperature. Both functional coatings and the continuity of reticulate foams show positive effect on the deformation resistance to temperature and load.

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Al2O3-C网状多孔陶瓷的热机械损伤及功能涂层的影响

碳结合氧化铝过滤器的热机械性能是保证其结构稳定性和过滤性能的关键。本文研究了Al2O3-C多孔陶瓷的I型断裂以及网状结构和涂层（氧化铝和碳键合六铝酸钙）的影响。验证了圆柱劈裂试验对泡沫和单体支撑强度的评价。应用DIC和AE技术监测压缩载荷引起的拉伸破坏。结果表明：局部损伤导致中心裂纹扩展，声发射信号持续释放；通常，机械强度随孔隙密度和氧化铝涂层的应用而增加。这种改进是由于更连续的应力传递和更好的烧结支撑。然而，在室温下，六铝酸钙涂层对泡沫的强化效果较差。功能涂层和网状泡沫的连续性对温度和载荷的变形抗力都有积极的影响。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.