Influence of starch content on microstructure of porous yttria-stabilized zirconia tapes
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2009
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CONGRESSO BRASILEIRO DE CERAMICA, 53.
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Resumo
Porous yttria stabilized zirconia (YSZ) substrates with volume fractions of
porosity ranging from 28.9 to 53 volume % 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 on
the final microstructure was investigated by FE-SEM. The porosities were above
those predicted for all the starch contents examined. 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 SEM image of a tape with 17.6 vol.% starch showed isolated
pores; the individual pores started to interact with increasing starch concentration to
37.8 vol.% and an open structure interconnecting the coarse pores was being
gradually established. The higher interconnection between pores resulted in larger cavities. The pores in the matrix reduced the sinterability of the YSZ leading to the
retention of closed porosity in the sintered tapes.
Como referenciar
ALBANO, MARIA P.; GARRIDO, LILIANA B.; PLUCKNETT, KEVIN; GENOVA, LUIS A. Influence of starch content on microstructure of porous yttria-stabilized zirconia tapes. In: CONGRESSO BRASILEIRO DE CERAMICA, 53., 7-10 de junho, 2009, Guaruja, SP. Anais... Disponível em: http://repositorio.ipen.br/handle/123456789/16672. Acesso em: 11 May 2024.
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