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Frontiers in Chemistry

Chemical and Process Engineering

Original Research ARTICLE Provisionally accepted The full-text will be published soon. Notify me

Front. Chem. | doi: 10.3389/fchem.2019.00792

Fracture behavior of mullite reticulated porous ceramics for porous media combustion

Xiong Liang1,  Yawei Li1*, Liping Pan1, Tianbin Zhu1, Qinghu Wang1,  Benwen Li2 and Christos G. Aneziris3
  • 1Wuhan University of Science and Technology, China
  • 2Dalian University of Technology (DUT), China
  • 3Freiberg University of Mining and Technology, Germany

Mullite reticulated porous ceramics (RPC) are one of the key components for porous media burner, the mechanical properties of mullite RPC decided the service life of the burner. However, the irregularities of cellular structure made it difficult to reveal the fracture behavior of mullite RPCs. In this study, the three-dimensional (3-D) structures of mullite RPCs were analysized by X-ray computed tomography. The strength and damage behavior of mullite RPCs were respectively investigated via the compression tests and finite element modelling based on the actual 3-D model, also the corresponding strengthening mechanism was proposed. The results indicated that the reconstructed 3-D model exhibited the real microstructure of mullite RPCs, containing the hollow struts and strut defects. The Young’s modulus calculated from actual 3-D structures was lower than that from Gibson-Ashby theory. In addition, the surface defects preceded triangular tips to generate the area of stress concentration, leading to the fracture behavior first occurred at the strut defects. With the formation of dense strut in mullite RPCs, the stress uniformly distributed in the whole solid skeleton, thus significantly improving the damage resistance of mullite RPCs.

Keywords: Mullite reticulated porous ceramics, X-ray computed tomography, Fracture behavior, Strengthening mechanism, Dense strut

Received: 14 Jun 2019; Accepted: 04 Nov 2019.

Copyright: © 2019 Liang, Li, Pan, Zhu, Wang, Li and Aneziris. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

* Correspondence: Prof. Yawei Li, Wuhan University of Science and Technology, Wuhan, 430081, Hubei Province, China, liyawei@wust.edu.cn