Electrical behavior and microstructural features of conventionally and electric field-assisted sintered 3 mol% yttria-stabilized zirconia
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2018
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BRAZILIAN MRS MEETING, 17th
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Resumo
ZrO2: 3 mol% Y2O3 ceramic powders, pressed to cylindrical pellets, were sintered
conventionally at 1400oC (CS) and by applying an AC electric field in green (FS)
and in pre-sintered (CS-FS) pellets. The electric field (200 V.cm-1, 1 kHz
frequency, 3 A limiting current) was applied at 1000oC. The experiments were
carried out positioning cylindrical specimens inside a vertical dilatometer
furnace, with platinum meshes at the parallel surfaces connected with platinum
wires to a power supply. The density of CS, FS and CS-FS were 98.9, 98.6 and
99.1% of theoretical density respectively. The average grain size were 282±73,
340±108 and 387±138 nm for conventionally sintering, conventionally follow by
flash sintering and only flash sintered samples. Although the samples have close
density values, the bulk and grain boundary conductivities of samples submitted
to electric field assisted sintering are higher than conventional sintered sample.
The intragranular and intergranular conductivities obtained by electrochemical
impedance spectroscopy of CS, FS and CS-FS samples were 8.7 and 9.8, 9.4 and
10.2 and 13.7 and 29.6 kΩ.cm, respectively. These results show that the
application of an AC electric field to a green or pre-sintered solid electrolyte
enhances its ionic conductivity due to the welding of the grains and the increased
in the oxide ion concentration due to diffusion to the grains of the chemical
species depleted at the space charge region, enhancing the oxide ion
concentration, both phenomena are provoked by the Joule heating produced by
the electric current flow.
Como referenciar
CARVALHO, SABRINA G. de M.; MUCCILLO, REGINALDO; MUCCILLO, ELIANA N. dos S. Electrical behavior and microstructural features of conventionally and electric field-assisted sintered 3 mol% yttria-stabilized zirconia. In: BRAZILIAN MRS MEETING, 17th, September 16-20, 2018, Natal, RN. Abstract... São Carlos: Aptor Software, 2018. p. 286-286. Disponível em: http://repositorio.ipen.br/handle/123456789/30329. Acesso em: 26 Jul 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.