Estudo da viabilidade do sistema LZAS para uso como selante de PaCOS
Cells the solid oxide fuel are systems capable to directly convert energy of a chemical reaction into electric energy in clean, quiet way and if its components in the solid state differentiate of excessively the techniques for having all. Its more common geometric configurations are: the tubular...
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| Formato: | Dissertação |
| Idioma: | por |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/12741 |
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| Resumo: | Cells the solid oxide fuel are systems capable to directly convert energy of a chemical
reaction into electric energy in clean, quiet way and if its components in the solid state
differentiate of excessively the techniques for having all. Its more common geometric
configurations are: the tubular one and to glide. Geometry to glide beyond the usual
components (anode, cathode and electrolyte) needs interconnect and sealant. E the search for
materials adjusted for these components is currently the biggest challenge found for the
production of the cells. The sealants need to present chemical stability in high temperatures,
to provoke electric isolation, to have coefficient of compatible thermal expansion with the
excessively component ones. For presenting these characteristics the glass-ceramics materials
are recommended for the application. In this work the study of the partial substitution of the
ZrO2 for the Al2O3 in system LZS became it aiming at the formation of system LZAS, this
with the addition of natural spodumene with 10, 20 and 30% in mass. The compositions had
been casting to a temperature of 1500°C and later quickly cooled with the objective to
continue amorphous. Each composition was worn out for attainment of a dust with average
diameter of approximately 3μm and characterized by the techniques of DRX, FRX, MEV,
dilatometric analysis and particle size analysis. Later the samples had been conformed and
treated thermally with temperatures in the interval between 700-1000 °C, with platform of 10
minutes and 1 hour. The analyses for the treated samples had been: dilatometric analysis,
DRX, FRX, electrical conductivity and tack. The results point with respect to the viability of
the use of system LZAS for use as sealant a time that had presented good results as isolating
electric, they had adhered to a material with similar α of the components of a SOFC and had
presented steady crystalline phases |
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