Abstract
Lanthanum silicate oxyapatite (LSO) is a promising ion conductive ceramic material, which has higher oxygen ion conductivity at intermediate temperatures (600-800?C) compared to yttria-stabilized zirconia. Its mechanical properties, though important for any of its applications, have been scarcely reported. In this study, we compare apparent densification, open porosity and Vickers hardness of samples conformed by uniaxial pressing and slip casting and fired up to 1600?C. Colloidal processing was optimized for slip casting in order to get high green densities. At sintering temperatures higher than 1400?C, both processing routes yielded comparable densities, although uniaxially pressed samples show slightly better mechanical properties, evidencing that slip cast ones already underwent a grain growth process.
Highlights
Alternative electrical power generation has always been the driving force for many research lines
Commercial fuel cells systems based on oxygen conduction electrolytes show yttria-stabilized zirconia (YSZ) as the oxide-conducting electrolyte due to its high oxide ion conductivity at high temperatures (800– 1000 °C)
The amount of dispersant is important for two reasons, one is to avoid the existence of an uncovered particle surface and the other is to avoid excess of it, which can generate bridging effect of the polyelectrolyte causing agglomeration as well as larger porosity while the dispersant is calcined during the sintering process
Summary
Alternative electrical power generation has always been the driving force for many research lines. Panteix et al [11] showed that a high densification of final samples significantly improves conductivity In this field, there have been efforts to reduce sintering temperatures required to obtain dense materials [1, 12,13,14,15,16], but there is still a way to go to improve densification. Despite the variety of previous studies, none of them compared two of the most common techniques for ceramics processing, slip casting and uniaxial pressing, which are two of the most usual ones for industrial application Speaking, it should be considered the real need for complex processing routes. The synthesis process used to obtain the ceramic powder is described elsewhere [13]
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