Influence of starch content and sintering temperature on the microstructure of porous yttria-stabilized zirconia tapes |
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Authors: | María P Albano Liliana B Garrido Kevin Plucknett and Luis A Genova |
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Affiliation: | (1) Centro de Tecnología de Recursos Minerales y Cerámica (CETMIC), C.C. 49 (B1897ZCA), M. B. Gonnet, Provincia de Buenos Aires, Argentina;(2) Department of Process Engineering and Applied Science, Dalhousie University, 1360 Barrington Street, Halifax, NS, B3J 1Z1, Canada;(3) Instituto de Pesquisas Energéticas e Nucleares (IPEN), Av. Lineu Prestes 2242-Cidade Universitária, CEP 05508-000 S?o Paulo, Brazil |
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Abstract: | Porous yttria-stabilized zirconia (YSZ) substrates with volume fractions of porosity ranging from 28.9 to 53 vol.% were developed
using starch as a fugitive additive. Concentrated aqueous YSZ slips with different amounts of starch and an acrylic latex
binder were prepared. The influence of the volume fraction of starch and sintering temperature on the sintering behavior and
final microstructure were investigated. Two kinds of pores were observed in the sintered tapes: large pores created by the
starch particles with lengths between 15 and 80 μm and smaller pores in the matrix with lengths between 0.6 and 3.8 μm. The
porosities were above those predicted for each of the starch contents. However, larger deviations from the predicted porosity
were found as more starch was added. The top surface of the sintered tapes had a greater porosity than the bottom one for
all the starch contents examined. The total porosity and the percentage of open porosity in the sintered tapes could be controlled
by the volume fraction of added starch as well as by the sintering temperature. The open pores between the YSZ particles were
removed by sintering at 1600 °C. As the volume fraction of starch increased from 17.6 to 37.8 vol.%, there was a gradual increase
in the interconnectivity of the pore structure. |
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