Micro-scale evolution of mechanical properties of glass-ceramic sealant for solid oxide fuel/electrolysis cells

Fakouri Hasanabadi, M ; Sharif University of Technology | 2021

297 Viewed
  1. Type of Document: Article
  2. DOI: 10.1016/j.ceramint.2020.09.250
  3. Publisher: Elsevier Ltd , 2021
  4. Abstract:
  5. The structural integrity of the sealant is critical for the reliability of solid oxide cells (SOCs) stacks. In this study, elastic modulus (E), hardness (H) and fracture toughness (KIC) of a rapid crystallizing glass of BaO–CaO–SiO2 system termed “sealant G” are reported as determined using an indentation test method at room temperature. A wide range of indentation loads (1 mN–10 N) was used to investigate the load-dependency of these mechanical properties. Values of 95 ± 12 GPa, 5.8 ± 0.2 GPa and 1.15 ± 0.07 MPa m0.5 were derived for E, H and KIC using the most suitable indentation loads. An application relevant annealing treatment of 500 h at 800 °C does not lead to a significant change of the mechanical properties. Potential self-healing behavior of the sealant has also been studied by electron microscopy, based on heat treatment of samples with indentation-induced cracks for 70 h at 850 °C. Although the sealant G is considered to be fully crystallized, evidence indicates that its cracks can be healed even in the absence of a dead load. © 2020 Elsevier Ltd and Techna Group S.r.l
  6. Keywords:
  7. Barium compounds ; Biomechanics ; Calcium oxide ; Fracture toughness ; Glass ceramics ; Heat treatment ; Indentation ; Sealants ; Silica ; Solid oxide fuel cells (SOFC) ; Annealing treatments ; Glass-ceramic Sealant ; Indentation load ; Indentation test ; Induced crack ; Self-healing ; Solid oxide ; Solid-oxide cells ; Cracks
  8. Source: Ceramics International ; Volume 47, Issue 3 , 2021 , Pages 3884-3891 ; 02728842 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S0272884220329692