Estimation of the effect of redox treatment on microstructure and tendency to brittle fracture of anode materials of YSZ–NiO(Ni) system

Authors

DOI:

https://doi.org/10.15587/1729-4061.2020.218291

Keywords:

YSZ–NiO ceramics, redox treatment, indentation, fracture toughness, fracture mechanism

Abstract

The effect of reduction treatment in a high-temperature (600 °C) hydrogen-containing environment on the microstructure and tendency to brittle fracture of YSZ–NiO(Ni) materials for solid oxide fuel cell anodes has been studied. To assess the crack growth resistance of the ceramics, the Vickers indentation technique was adapted, which allowed estimating the microhardness and fracture toughness of the material in the complex.

The requirements for high porosity of the anodes to ensure functional properties show that the strength may be an insufficient characteristic of the bearing capacity of the anode. More structurally sensitive characteristics are needed to assess its crack growth resistance.

The average levels of microhardness of YSZ–NiO ceramics in the as-sintered state and YSZ–NiO(Ni) cermets (2.0 GPa and 0.8 GPa, respectively) and their fracture toughness (3.75 MPa·m1/2 and 2.9 MPa·m1/2, respectively) were experimentally determined.

It was found that the microstructure of YSZ–NiO(Ni) cermet after redox treatment is formed by a YSZ ceramic skeleton with refined Ni-phase grains combined in a network, which provides increased electrical conductivity. Along with higher porosity of the cermet, its fracture toughness is not lower than that of the one-time reduced cermet due to the implementation of the bridging toughening mechanism of fracture.

The proposed treatment method allowed forming the microstructure of the anode material, resistant to crack propagation under mechanical load. The propensity of the anode material to brittle fracture on the basis of evaluation of its crack growth resistance and analysis of the microstructure and fracture micromechanism was substantiated. This result is interesting from a theoretical point of view. From a practical point of view, the developed technique allows determining the conditions of redox treatment in the technology of manufacturing fuel cell anodes

Author Biographies

Bogdan Vasyliv, Karpenko Physico-Mechanical Institute of the NAS of Ukraine Naukova str., 5, Lviv, Ukraine, 79060

PhD, Senior Researcher

Department of Hydrogen Technologies and Materials of Alternative Power Engineering

Volodymyr Kulyk, Lviv Polytechnic National University Bandery str., 12, Lviv, Ukraine, 79013

Doctor of Technical Sciences

Department of Applied Materials Science and Materials Engineering

Zoia Duriagina, Lviv Polytechnic National University Bandery str., 12, Lviv, Ukraine, 79013 The John Paul II Catholic University of Lublin Racławickie al., 14, Lublin, Poland, 20-950

Doctor of Technical Sciences, Professor

Department of Applied Materials Science and Materials Engineering

Doctor Habilitatus, Professor

Institute of Materials Engineering

Dariusz Mierzwinski, Cracow University of Technology Warszawska str., 24, Cracow, Poland, 31-155

PhD

Faculty of Material Engineering and Physics

Taras Kovbasiuk, Lviv Polytechnic National University Bandery str., 12, Lviv, Ukraine, 79013

PhD

Department of Applied Materials Science and Materials Engineering

Tetiana Tepla, Lviv Polytechnic National University Bandery str., 12, Lviv, Ukraine, 79013

PhD, Associate Professor

Department of Applied Materials Science and Materials Engineering

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2020-12-31

How to Cite

Vasyliv, B., Kulyk, V., Duriagina, Z., Mierzwinski, D., Kovbasiuk, T., & Tepla, T. (2020). Estimation of the effect of redox treatment on microstructure and tendency to brittle fracture of anode materials of YSZ–NiO(Ni) system. Eastern-European Journal of Enterprise Technologies, 6(12 (108), 61–71. https://doi.org/10.15587/1729-4061.2020.218291

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Vol. 6 No. 12 (108) (2020): Materials Science

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Materials Science

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Copyright (c) 2020 Bogdan Vasyliv, Volodymyr Kulyk, Zoia Duriagina, Dariusz Mierzwinski, Taras Kovbasiuk, Tetiana Tepla

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