Flash sintering of 3 mol% yttria-stabilized zirconia with AC and DC electric fields
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2018
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BRAZILIAN MRS MEETING, 17th
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Resumo
Experiments on sintering ZrO2: 3 mol% Y2O3 polycrystalline ceramics (Y-TZP),
pressed to cylindrical pellets, were carried out by heating to 1000 oC for
application of a DC and AC (1 kHz) electric field (isothermal electric field-assisted
sintering) of 200 V.cm-1 for 30 seconds, and 2 A as current limit. The experiments
were carried out positioning cylindrical specimens inside a vertical dilatometer,
with platinum meshes at the parallel surfaces connected with platinum wires to a
power supply. Both 3YSZ sintered samples, besides having their apparent
densities determined, had their surfaces observed in a scanning electron
microscope to evaluate average grain size and distribution of grain sizes.
Moreover, impedance spectroscopy analyses were carried out to evaluate the
intergranular (mainly grain boundary) and intragranular (bulk) contributions to
the electrical resistivity. The results show that besides both samples present
similar densities and electrical resistivity, the one submitted to AC electric fieldassisted
sintering presented smaller grains sizes and a discrete grain size
distribution when compared to the one sintered with DC electric field.
Como referenciar
CARVALHO, SABRINA G. de M.; MUCCILLO, REGINALDO; MUCCILLO, ELIANA N. dos S. Flash sintering of 3 mol% yttria-stabilized zirconia with AC and DC electric fields. In: BRAZILIAN MRS MEETING, 17th, September 16-20, 2018, Natal, RN. Abstract... São Carlos: Aptor Software, 2018. p. 1062-1062. Disponível em: http://repositorio.ipen.br/handle/123456789/30330. Acesso em: 26 Jul 2024.
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