Performance of a glass-ceramic sealant in a SOFC short stack

Smeacetto, Federico; Salvo, Milena; Santarelli, Massimo; Leone, Pierluigi; Ortigoza-Villalba, G.A.; Lanzini, Andrea; Ajitdoss, Lakshmi Chandru; Ferraris, Monica

doi:10.1016/j.ijhydene.2012.07.025

Cited by 39 publications

(19 citation statements)

References 22 publications

(10 reference statements)

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“…Furthermore, in applications involving the joining of materials, the thermal expansion requires a fairly narrow compatibility to match the shrinkage, as in glass and glass-ceramic/metal systems for hermetic seals, laser tubes, electronic devices for measuring and monitoring, sealants for solid oxide fuel cells (SOFCs), and substrates used in microelectronic packaging on LTCC technology (low temperature co-fired ceramics) [15][16][17][18][19] . In previous works 20,21 it was demonstrated that the addition of nanosized alumina in a LZS glass-ceramic matrix, produced by conventional sintering, was able to reduce the CTE significantly.…”

Section: Introductionmentioning

confidence: 99%

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

et al. 2017

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In this work, nanometric Al 2 O 3 (1-5 vol.%) particles (13 nm, 100 m 2 /g) were added to a 19.58Li 2 O•11.10ZrO 2 •69.32SiO 2 (mol%) (3.5 µm, 2.5 m 2 /g) parent glass-ceramic matrix to prepare composites with the purpose of studying the influence of Al 2 O 3 on their structure, microstructure, mechanical, thermal and electrical properties when sintered by fast firing. The parent glass-ceramic was prepared by melting and fast cooling (in water) to obtain a glass frit. The resulting glass frit was milled according to a two-step procedure consisting on a dry milling stage followed by a long wet milling step down. Each composition was wet homogenized and then dried at 110 ºC for 48 h for disaggregation. The obtained powders were uniaxially pressed (100 MPa) and compacts sintered by fast firing (175 ºC/min) between 800 and 900 ºC for 30 min. The composites, with relative densities ranging from 89% to 93%, showed zircon and β-spodumene as main crystalline phases. The hardness and Young's modulus varied from 4.5 to 6.5 GPa, and from 65 to 102 GPa, respectively. The formation of β-spodumene in the obtained composites leads to reduce the CTEs, whose values ranged from 13 to 7 x 10 -6 ºC -1 .

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Section: Introductionmentioning

confidence: 99%

LZS/Al2O3 Glass-Ceramic Composites Sintered by Fast Firing

et al. 2017

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“…However, this type of material can be a source of Si poisoning and cell degradation , . Though excellent performance and durability can be obtained , , hardened glass‐ceramic seals are also difficult to separate from the other components (e.g., cell, interconnect plate) without extensive, invasive, and often destructive procedures. Thermal cyclability is vital to the commercial success of SOCs and has been demonstrated , .…”

Section: Introductionmentioning

confidence: 99%

Performance of Non‐Destructive Compressive Seals for Reversible Solid Oxide Cells

2017

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Contrary to hardened glass ceramics, compressive non‐destructive seals for solid oxide cells (SOCs) could enable stack repairs without utilizing destructive separation methods. In light of increasing interest for high temperature steam electrolysis and energy storage, the performances of two commercially available compressive materials were investigated in humidified gas conditions: Thermiculite‐866 and AFS‐170 alumina felts. Mass loss and thermogravimetric (TGA) experiments carried out in inert, oxidizing, and reducing atmospheres at 800 °C showed no influence of the atmosphere on the alumina felts, and a reversible redox behavior for Thermiculite‐866. Thermiculite‐866 showed better cyclability compared to AFS‐170 during SOC thermal cycling experiments. Initial open circuit voltages in dry H2 were measured and compared to those obtained with commercial mica seals. The highest were recorded with Thermiculite‐866, followed by mica and AFS‐170. The species outgassed by Thermiculite‐866 were quantified, and fluorine was found to be the main component released at 800 °C.

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“…A potential sealing material should have the similar coefficient of thermal expansion (CTE) to that of the other components and be chemically inert. Up to now, three main kinds of sealing materials have been developed [1][2][3], namely braze, mica and glass (or glass-ceramic). Among them, glass is the primary sealant because it has the good thermal stability, chemical compatibility and chemical stability [4][5][6].…”

Section: Introductionmentioning

confidence: 99%