Sintering of glasses in the system RO–Al2O3–BaO–SiO2 (R=Ca, Mg, Zn) studied by hot-stage microscopy

Lara, C.; Pascual, María J.; Prado, Miguel Oscar; Durán, Alicia

doi:10.1016/j.ssi.2004.03.009

Cited by 113 publications

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“…However, neither dry quenching of the molten glass nor using vacuum-dried B2O3 for glass melting could reduce foaming. Lara et al (2004) observed foaming during sintering and crystallization treatments of Ca, Mg, and Zn alumosilicate glass powders for SOFC sealing to be most pronounced in Ca alumosilicate glass powders (up to 30% silhouette area increase in heating microscopy experiments). The authors discussed the formation of crystals of lower density and/or gas evolution during crystallization for causing the observed foaming.…”

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confidence: 89%

Sintering and Foaming of Barium Silicate Glass Powder Compacts

2016

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The manufacture of sintered glasses and glass-ceramics, glass matrix composites, and glass-bounded ceramics or pastes is often affected by gas bubble formation. Against this background, we studied sintering and foaming of barium silicate glass powders used as SOFC sealants using different powder milling procedures. Sintering was measured by means of heating microscopy backed up by XPD, differential thermal analysis, vacuum hot extraction (VHE), and optical and electron microscopy. Foaming increased significantly as milling progressed. For moderately milled glass powders, subsequent storage in air could also promote foaming. Although the powder compacts were uniaxially pressed and sintered in air, the milling atmosphere significantly affected foaming. The strength of this effect increased in the order Ar ≈ N2 < air < CO2. Conformingly, VHE studies revealed that the pores of foamed samples predominantly encapsulated CO2, even for powders milled in Ar and N2. Results of this study thus indicate that foaming is caused by carbonaceous species trapped on the glass powder surface. Foaming could be substantially reduced by milling in water and 10 wt% HCl.

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confidence: 89%

Sintering and Foaming of Barium Silicate Glass Powder Compacts

2016

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“…Generally, the sintering process should be completed before crystallization occurs to obtain a dense seal [14]. Uncontrolled crystallization during the initial sintering process can lead to the formation of a porous sealing layer that can adversely affect the SOFC operation.…”

Section: Crystallization Studiesmentioning

confidence: 99%

Stored CO2 and Methane Leakage Risk Assessment and Monitoring Tool Development: CO2 Capture Project Phase 2 (CCP2)

Kieki¹

2008

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“…6)16) The aluminum-borosilicate glass usually yields a CTE matching that of other SOFC stack components when it contains an amount of barium oxide, and thus the BaOAl 2 O 3 B 2 O 3 SiO 2 system glasses can be used as high-temperature sealants for SOFC. 17)24) For instance, Lara et al 25), 26) reported that the CTE of ROBaOSiO 2 system glasses are in the range of 8.512 © 10 ¹6 K ¹1 . Ghosh et al 27) have studied the effect of BaO addition on the MgOBaO Al 2 O 3 La 2 O 3 B 2 O 3 SiO 2 system glasses, and developed a promising glass composition having MgO and BaO content of 22 and 25 mol %, respectively.…”

Section: Introductionmentioning

confidence: 99%

Effects of lanthanum-to-calcium ratio on the thermal and crystalline properties of BaO–Al2O3–B2O3–SiO2 based glass sealants for solid oxide fuel cells

Liu

Lin

Lee

2015

J. Ceram. Soc. Japan

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A series of barium-aluminum-borosilicate system glasses, designated as GC9, with the formula of 34BaO4.5Al 2 O 3 9.5B 2 O 3 34SiO 2 1ZrO 2 xLa 2 O 3 (17x)CaO, where x = 0, 1, 3, 5, 7 in mol %, have been developed as the high-temperature sealants using for solid oxide fuel cells (SOFCs). The effects of lanthanum-to-calcium (La/Ca) ratios on the thermal and crystalline properties of the GC9 glass were investigated in the present study. The density, glass transition temperature (T g ), and softening temperature (T s ) of the GC9 glass increase with increasing the La/Ca ratio. The average coefficient of thermal expansion (CTE) in the temperature range from 25 to 650°C for the glass system varies from 8.25 © 10 ¹6 to 9.49 © 10 ¹6 K ¹1. The T g , T s and CTE for the optimized GC9 glass are 652, 745°C, and 9.48 © 10 ¹6 K ¹1, respectively, at the La/Ca ratio of 0.833. After annealing at 750°C for 4 h in air, the crystallinity of the GC9 glass increases with increasing the La/Ca ratio and the crystalline phase is mainly Ba 3 La 6 (SiO 4 ) 6 . In addition, the GC9 glass with a La/Ca ratio of 0.833 possesses well wetting and adhesion joining with metallic interconnect, and ceramic positive electrode-electrolyte-negative electrode (PEN) plate after sealed at 850°C for 4 h.

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Sintering of glasses in the system RO–Al2O3–BaO–SiO2 (R=Ca, Mg, Zn) studied by hot-stage microscopy

Cited by 113 publications

References 3 publications

Sintering and Foaming of Barium Silicate Glass Powder Compacts

Sintering and Foaming of Barium Silicate Glass Powder Compacts

Stored CO2 and Methane Leakage Risk Assessment and Monitoring Tool Development: CO2 Capture Project Phase 2 (CCP2)

Effects of lanthanum-to-calcium ratio on the thermal and crystalline properties of BaO–Al<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> based glass sealants for solid oxide fuel cells

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Sintering of glasses in the system RO–Al2O3–BaO–SiO2 (R=Ca, Mg, Zn) studied by hot-stage microscopy

Cited by 113 publications

References 3 publications

Sintering and Foaming of Barium Silicate Glass Powder Compacts

Sintering and Foaming of Barium Silicate Glass Powder Compacts

Stored CO2 and Methane Leakage Risk Assessment and Monitoring Tool Development: CO2 Capture Project Phase 2 (CCP2)

Effects of lanthanum-to-calcium ratio on the thermal and crystalline properties of BaO&ndash;Al<sub>2</sub>O<sub>3</sub>&ndash;B<sub>2</sub>O<sub>3</sub>&ndash;SiO<sub>2</sub> based glass sealants for solid oxide fuel cells

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Effects of lanthanum-to-calcium ratio on the thermal and crystalline properties of BaO–Al<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub>–SiO<sub>2</sub> based glass sealants for solid oxide fuel cells