Optimization of the rheology and sintering behavior of electrolyte and anode pastes to be used in co-extrusion of solid oxide fuel cells

Mani, Behtash

doi:10.1016/j.jeurceramsoc.2014.10.026

Cited by 6 publications

(6 citation statements)

References 14 publications

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“…The pastes are unextrudable when containing less liquid than that required to fill the inter-particulate voids. This critical liquid content can be estimated at the intercept of the plotted line with the x -axis (liquid content) [17]. According to Figure 10, this critical liquid content was obtained 23 wt-% in this study.…”

Section: Resultsmentioning

confidence: 66%

“…As seen for the paste with 35 wt-% liquid content (Figure 5(b)), the extrusion load increases in the initial stage and then remains constant, which is typical behaviour indicating extrusion of free air bubble paste with no liquid separation [8,17]. Moreover, it would be expected that well mixing of powders and the solvent during paste preparation were occurred [8,17]. In this case, the paste could extrude in an acceptable manner and defect-free tubes could be fabricated.…”

Section: Resultsmentioning

confidence: 96%

“…The extrusion pressure ( P ) dependence on the L / D ratio (length/diameter) of sodium beta-alumina paste with 35 wt-% liquid content for different ram velocities is given in Figure 9. As seen in Figure 9, the P versus L / D curves exhibit linear behaviour at different velocities, which would be an evidence of well mixing during paste preparation [17,23].

Figure 9 Extrusion pressure versus L / D ratios for a paste extruded at different velocities. …”

Section: Resultsmentioning

confidence: 98%

“…As shown in Figure 5(c), when the liquid content of the paste was high (45 wt-%), it was not possible to extrude a defect-free tube due to the low viscosity of the paste. As seen for the paste with 35 wt-% liquid content (Figure 5(b)), the extrusion load increases in the initial stage and then remains constant, which is typical behaviour indicating extrusion of free air bubble paste with no liquid separation [8,17]. Moreover, it would be expected that well mixing of powders and the solvent during paste preparation were occurred [8,17].…”

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 5(c), when the liquid content of the paste was high (45 wt-%), it was not possible to extrude a defect-free tube due to the low viscosity of the paste. As seen for the paste with 35 wt-% liquid content (Figure 5 Moreover, it would be expected that well mixing of powders and the solvent during paste preparation were occurred [8,17]. In this case, the paste could extrude in an acceptable manner and defect-free tubes could be fabricated.…”

Section: Rheological Properties and Optimum Amount Of Liquidmentioning

confidence: 90%

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Paste backward extrusion process as a suitable method for fabrication of sodium beta-alumina electrolyte closed-end tubes

Moghadam

2021

Advances in Applied Ceramics

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In this study, paste backward extrusion is introduced for fabrication of sodium beta-alumina electrolyte closed-end tubes (with a wall thickness of 1 mm and external diameter of 8.0 mm). For this purpose, the two-piece extrusion die was designed and extrudable waterbased paste was prepared by using sodium beta-alumina powder, polyvinyl pyrrolidone, as a binder, and ethylene glycol as a plasticizer. The effect of solvent content on the rheological parameters of the paste and the ram extrusion velocity on the liquid phase separation are investigated. The results indicate that the optimum solvent content for making the extrudable paste is in the range of 30-35 wt-%, and the liquid phase separation is obviously occurred when the ram velocity is lower than 1.2 mm s −1 . It was also shown that by using backward extrusion, and by applying optimum conditions, closed-end tubes with high density (about 97%) and good surface quality could be fabricated successfully.

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Section: Resultsmentioning

confidence: 66%

Section: Resultsmentioning

confidence: 96%

Figure 9 Extrusion pressure versus L / D ratios for a paste extruded at different velocities. …”

Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

“…As shown in Figure 5(c), when the liquid content of the paste was high (45 wt-%), it was not possible to extrude a defect-free tube due to the low viscosity of the paste. As seen for the paste with 35 wt-% liquid content (Figure 5 Moreover, it would be expected that well mixing of powders and the solvent during paste preparation were occurred [8,17]. In this case, the paste could extrude in an acceptable manner and defect-free tubes could be fabricated.…”

Section: Rheological Properties and Optimum Amount Of Liquidmentioning

confidence: 90%

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