scholarly journals Sintering/Crystallization and Viscosity of Sealing Glass-Ceramics

Crystals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 737
Author(s):  
Sonia Rodríguez-López ◽  
Maria Pascual
Keyword(s):  
Solid Oxide Fuel Cells ◽  
Glass Composition ◽  
Glass Ceramics ◽  
Crystallization Rate ◽  
Solid Oxide ◽  
Working Temperature ◽  
Start Up ◽  
Sealing Glass ◽  
Crystallization Of Glass

Two glass-ceramics sealants for solid-oxide fuel cells (SOFC) in the system BaO/SrO-MgO-B2O3-SiO2 have been analysed according to relevant sealing parameters such as sintering and crystallization of the glass powders and dilatation and viscosity evolution with crystallization of glass-ceramic compacts. Special emphasis is given to the crystallization kinetics and mechanism, crystalline phases formed and the role of viscosity in the whole sealing process. The slower crystallization rate of the strontium-containing glass composition results in good joining with the interconnect steel before the glass starts to crystallize and increases its viscosity. This avoids and excessive sealing temperature and offers better compatibility with the start up and working temperature of an SOFC (750–850 °C).

Brittle Fracture Studies of Solid Oxide Fuel Cells

2009 ◽  
Vol 409 ◽  
pp. 81-93
Author(s):  
Jürgen Malzbender ◽  
Rolf W. Steinbrech ◽  
Egbert Wessel
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Glass Ceramics ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Lanthanum Strontium Manganite ◽  
Decentralized Energy ◽  
Ysz Electrolyte ◽  
Power Densities

Solid Oxide Fuel Cells (SOFCs) with electrical efficiencies above 50 % are considered as very promising option for future decentralized energy conversion. At the Forschungszentrum Juelich (FZJ) planar SOFC stacks are currently being developed and tested at 800°C and up to 10000 h using H2 and methane as fuel. Stacks in the kW class routinely reach power densities of 700 W/cm². Typically the layered material composite of the FZJ-stack consists of cells with yttria stabilized zirconia (YSZ) electrolyte, Ni-YSZ anode and a cathode of lanthanum strontium manganite. The cells are mounted between ferritic steel interconnects. The fuel and air compartment are sealed by glass-ceramics and more recently also by metal brazes. Significant progress in reliable stack operation has been achieved over the past decade. However, problems with thermo-chemical and thermo-mechanical compatibility still remain a major challenge. To illustrate the complexity of material interactions in SOFCs, selected problems related to mechanical failure processes are presented. The role of residual stresses is addressed and fracture phenomena of cell and sealant are described in greater detail.

Structural transformation-induced surface strengthening of borosilicate sealing glass for solid oxide fuel cells

2019 ◽  
Vol 45 (12) ◽  
pp. 15629-15635 ◽  
Author(s):  
Jiajia Yan ◽  
Yukun Wu ◽  
Dewei Lin ◽  
Hongbing Zhan ◽  
Haiyan Zhuang ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Structural Transformation ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Surface Strengthening ◽  
Sealing Glass

Improving sealing properties of CaO-SrO-Al2O3-SiO2 glass and glass-ceramics for solid oxide fuel cells: Effect of La2O3 addition

2020 ◽  
Vol 46 (11) ◽  
pp. 17698-17706 ◽  
Author(s):  
Zhiwei Luo ◽  
Weicheng Lei ◽  
Haozhang Liang ◽  
Wenjing Xu ◽  
Xinyu Liu ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Glass Ceramics ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
Sio2 Glass

Role of the gadolinia-doped ceria interlayer in high-performance intermediate-temperature solid oxide fuel cells

2017 ◽  
Vol 361 ◽  
pp. 153-159 ◽  
Author(s):  
Doh Won Jung ◽  
Chan Kwak ◽  
Sooyeon Seo ◽  
Kyoung-Seok Moon ◽  
In-taek Han ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
High Performance ◽  
Solid Oxide ◽  
Intermediate Temperature ◽  
Doped Ceria ◽  
Oxide Fuel
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