Novel glass-ceramic SOFC sealants from glass powders and a reactive silicone binder

Elsayed, Hamada; Javed, Hassan; Sabato, Antonio Gianfranco; Smeacetto, Federico; Bernardo, Enrico

doi:10.1016/j.jeurceramsoc.2018.05.024

Cited by 40 publications

(19 citation statements)

References 19 publications

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“…[4][5][6] In planar SOFC, the cell and interconnect are joined by seals, identified as the critical component. 7,8 Ideal seals must meet multiple criteria, including but not limited to low leakage rates, high electrical insulation, excellent chemical compatibility over a wide A survey of the published literature modeling of CMCs has been studied by a n ers. Processes that have been modeled CVD, 17,18 CVI, [19][20][21][22] and Sol-Gel Infiltrat of alumina matrix in eight-harness satin has been studied numerically in Ref.…”

Section: Introductionmentioning

confidence: 99%

Effect of interconnect pre‐oxidation on high‐temperature wettability and mechanical properties of glass seals in SOFC

Tao

Wang

et al. 2021

J Am Ceram Soc.

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Metallic interconnect oxidation has a significant influence on shear strength between interconnect and sealing glass in SOFC stack operation. This is attributed to high-temperature mutual wettability. In this work, the glass having different crystallization kinetics was chosen to evaluate wettability and shear strength on Fe-16Cr alloy, which was heated treated at 750°C for 0, 50, and 100 h, forming oxide scale with a varying rough surface. Visual observation was used to quantify equilibrium contact angles between glass and substrates. The results illustrated that alloy oxidized for 50 h exhibited better wettability and shear strength, implying that thickness and roughness of the oxide scale are critical to enhancing interface joint strength. Long-term testing indicated that thermally stable glass possesses higher joint shear strength and more consistent properties. It was found that precipitated crystalline phases limited improvement of glass wettability, resulting in interfacial delamination of the glass/alloy layer over long-term operation.

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Section: Introductionmentioning

confidence: 99%

Effect of interconnect pre‐oxidation on high‐temperature wettability and mechanical properties of glass seals in SOFC

Tao

Wang

et al. 2021

J Am Ceram Soc.

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“…Combination of O -Al2O3 -SiO2 [BAS] [36] material composition with B2O3 use control to obtain the coefficient of thermal expansion (CTE), Glass Transition (Tg) and Deformation Temperature (Td). In the CaO-MgO-Al2O3-SiO2 system [19], the addition of Na2O, ZrO2, and B2O3 is applied to obtain the values of thermal expansion coefficient (CTE), Crystallization Temperature (Tx) and Melting Temperature (Tc). CaO-SiO2-Al2O3-MgO system [37] is applied with the composition of the material in the sample but the thermal properties have not been explored.…”

Section: Resultsmentioning

confidence: 99%

“…Boron oxide is mostly incorporated to reduce glass viscosity as well as to reduce the softening point and the transition temperature of glass from SOFC sealants [18]. Boron oxide plays important role in enhancing the coefficient of thermal expansion, for compositions where only the B2O3 / SiO2 ratio is changed [16,19]. While boron oxide as a whole generates a decline in the glass transition temperature, the coefficient of thermal expansion for most glasses increases after crystallization.…”

Section: Character Strengthening Oxidesmentioning

confidence: 99%

“…More prevalent reactions are occured with interconnecting materials, mainly due to chromium, which is usually available in ceramic and metal interconnecting materials. Among the most applied alkaline earth oxides, silicates composed of barium oxide are the most reactive [20,23] and while compounds composed of magnesium oxide are the most compliant [19,24].…”

Section: Character Strengthening Oxidesmentioning

confidence: 99%

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Progress in Glass-Ceramic Seal for Solid Oxide Fuel Cell Technology

Gunawan

Sulistyo

Setyawan³

2021

ARFMTS

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Solid oxide fuel cells (SOFCs) have emerged as promising energy conversion devices nowadays. SOFC consists of several components such as cathode, anode, electrolyte, interconnects, and sealing materials. In planar SOFC stack construction, the sealant and interconnection functions play an important role. Glass and ceramics are quite popularly used as SOFC sealing materials to achieve several functions including preventing leakage of fuel and oxidants in the stack and electrically isolating cells in the stack. In this review, material preparation, material composition, ceramic properties especially thermal properties are compared from various systems that have been developed previously. The main challenges and complexities in the functional part of SOFC sealants include: (i) chemical incompatibility and instability in the oxidizing and reducing environment by adjusting the value of the thermal expansion coefficient (CTE) with the interconnecting material during SOFC operation, and (ii) insulation of oxidizing fuels and gases by matching CTE anode and cathode. Also, the sealant glass transition determines the maximum permissible working temperature of the SOFC. The choice of method and analysis will provide data on various ceramic attributes. The search for thermal attributes consisting of Glass transition (Tg), Deformation temp (Td), Crystallization temp (Tx), Melting pt (Tm) became a focus on SOFC sealant development.

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“…Future investigations will be conducted on both heating conditions and formulations. More precisely, we could think at localized heating (e.g., by means of lasers) or hybrid binding materials, that could bind with glass powders in a nearly molecular way (on one hand, ORMOSIL class materials have been already used in ceramic additive manufacturing; on the other one, silicones may be considered as novel silica‐yielding binders …”

Section: Resultsmentioning

confidence: 99%

Comparative Analysis of Wollastonite‐Diopside Glass‐Ceramic Structures Fabricated via Stereo‐Lithography

et al. 2019

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One key feature of digital light processing consists of the high flexibility in the design of highly porous reticulated scaffolds. In the present paper, the authors report recent experiences concerning two glasses, both converted into wollastonite-diopside (CaSiO 3 -CaMgSi 2 O 6 ) glass-ceramics by viscous flow sintering of fine powders (<45 μm) with concurrent crystallization. Glass particles are homogeneously dispersed in a photosensitive polymer, selectively hardened, layer-by-layer, by exposure to visible light, forming diamond cell lattices. The printing accuracy is slightly influenced by the glass chemistry, whereas the shape maintenance, after firing at 1100 C, is observed for both compositions. The newly developed scaffolds are compared to other glass-ceramic scaffolds, previously developed on the basis of the starting glass: the adoption of a new design does not determine any substantial degradation of mechanical properties.

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Novel glass-ceramic SOFC sealants from glass powders and a reactive silicone binder

Cited by 40 publications

References 19 publications

Effect of interconnect pre‐oxidation on high‐temperature wettability and mechanical properties of glass seals in SOFC

Effect of interconnect pre‐oxidation on high‐temperature wettability and mechanical properties of glass seals in SOFC

Progress in Glass-Ceramic Seal for Solid Oxide Fuel Cell Technology

Comparative Analysis of Wollastonite‐Diopside Glass‐Ceramic Structures Fabricated via Stereo‐Lithography

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