Electric field-assisted sintering of yttria-stabilized zirconia: dependence on the frequency and the current density
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2016
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BRAZILIAN MRS MEETING, 15th
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Resumo
ZrO2:3 mol% Y2O3 green pellets were sintered by applying AC electric fields
(0.5-1.1 MHz, 100/200 V.cm-1, 20-120 mA.mm2) at T<1200oC (first stage
sintering). Similar specimens reached shrinkage levels dependent on the
frequency of the applied field, suggesting that the Joule heating imparted to the
specimen depends on the number of collisions of charge carriers with chemical
species at the intergranular region. Moreover, under similar experimental
conditions, the shrinkage level increases for increasing electric current density,
up to a limit close to full shrinkage. Electrochemical impedance spectroscopy
experiments were carried out in the ionic domain in flash sintered specimens. The
Arrhenius plots of bulk and grain boundary contributions are evidence that for
increasing electric current density the bulk conductivity is the same, but the grain
boundary conductivity increases. It is proposed that the preferential paths for the
electric current through the sample are the interfaces, mainly grain boundaries
and pores. Moreover, the results give additional evidence for densification upon
sintering without significant grain growth under electric field-assisted sintering.
Como referenciar
CARVALHO, SABRINA G. de M.; MUCCILLO, ELIANA N. dos S.; MUCCILLO, REGINALDO. Electric field-assisted sintering of yttria-stabilized zirconia: dependence on the frequency and the current density. In: BRAZILIAN MRS MEETING, 15th, September 25-29, 2016, Campinas, SP. Abstract... São Carlos, SP: Aptor Software, 2016. p. 71-71. Disponível em: http://repositorio.ipen.br/handle/123456789/28057. Acesso em: 26 Mar 2026.
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