Towards the Validation of a Phase Field Model for Ni Coarsening in Solid Oxide Cells

Martina Trini, Salvatore De Angelis, Peter Stanley Jørgensen*, Peter Vang Hendriksen*, K. Thornton, Ming Chen*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Ni coarsening in the Ni/yttria-stabilized zirconia (YSZ) fuel electrode of solid oxide cells (SOCs) is a major cause of long-term performance degradation. Phase-field modeling is a powerful tool for studying Ni coarsening in the complex 3D structures of SOC fuel electrodes. In this work, we present a study aimed at validating a phase-field model, comparing simulation results with time-dependent ex-situ tomographic data. Three equilibrium Ni/YSZ contact angles are examined: 97°, 120°, and 150°. Simulated microstructures are characterized through quantities such as the Ni mean radius, triple-phase boundaries, and interface shape distribution. The phase-field model reproduces the improved pore connectivity in the first stage of Ni coarsening observed in the tomography data. This model also indicates that the contact angle plays a key role in the microstructural evolution during Ni coarsening, and the best match to the experiment was obtained with the equilibrium contact angle of 120º, close to a measured value in literature. Finally, the limitations of the model are discussed.
Original languageEnglish
Article number116887
JournalActa Materialia
Volume212
ISSN1359-6454
DOIs
Publication statusPublished - 2021

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