Grain boundary diffusion driven spark plasma sintering of nanocrystalline zirconia

Hanna Borodianska; Dmytro Demirskyi; Yoshio Sakka; Petre Badica; Oleg Vasylkiv

doi:10.1016/j.ceramint.2011.12.064

Grain boundary diffusion driven spark plasma sintering of nanocrystalline zirconia

Hanna Borodianska, Dmytro Demirskyi, Yoshio Sakka, Petre Badica, Oleg Vasylkiv

Advanced Institute for Materials Research (AIMR)

Research output: Contribution to journal › Article › peer-review

27 Citations (Scopus)

Abstract

A methodology is proposed to investigate in detail shrinkage kinetics under isothermal spark plasma sintering (SPS) conditions applied to ceramic nano powders such as Y ₂O ₃ stabilized ZrO ₂. To do so, mild SPS conditions were used (low temperatures and pressure, long dwell times). The extracted experimental activation energy has the value of 246 ± 37 kJ mol ^-1 and the slope of the curves on the intense densification stage is around 0.33. Results are in agreement with densification by a grain-boundary diffusion mechanism as for conventional sintering and the contribution from the specific pressure-assisted mechanisms as for hot pressing is insignificant. This result suggests that exploration of mild SPS might prove rewarding in separation and control of the sintering mechanisms leading to production of specific ceramic with new or improved functionality.

Original language	English
Pages (from-to)	4385-4389
Number of pages	5
Journal	Ceramics International
Volume	38
Issue number	5
DOIs	https://doi.org/10.1016/j.ceramint.2011.12.064
Publication status	Published - 2012 Jul

Keywords

Activation energy
Grain boundary diffusion
Nanopowder
Sintering kinetic
Spark plasma sintering
Zirconia

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10.1016/j.ceramint.2011.12.064

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title = "Grain boundary diffusion driven spark plasma sintering of nanocrystalline zirconia",

abstract = "A methodology is proposed to investigate in detail shrinkage kinetics under isothermal spark plasma sintering (SPS) conditions applied to ceramic nano powders such as Y 2O 3 stabilized ZrO 2. To do so, mild SPS conditions were used (low temperatures and pressure, long dwell times). The extracted experimental activation energy has the value of 246 ± 37 kJ mol -1 and the slope of the curves on the intense densification stage is around 0.33. Results are in agreement with densification by a grain-boundary diffusion mechanism as for conventional sintering and the contribution from the specific pressure-assisted mechanisms as for hot pressing is insignificant. This result suggests that exploration of mild SPS might prove rewarding in separation and control of the sintering mechanisms leading to production of specific ceramic with new or improved functionality.",

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AU - Borodianska, Hanna

AU - Demirskyi, Dmytro

AU - Sakka, Yoshio

AU - Badica, Petre

AU - Vasylkiv, Oleg

PY - 2012/7

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N2 - A methodology is proposed to investigate in detail shrinkage kinetics under isothermal spark plasma sintering (SPS) conditions applied to ceramic nano powders such as Y 2O 3 stabilized ZrO 2. To do so, mild SPS conditions were used (low temperatures and pressure, long dwell times). The extracted experimental activation energy has the value of 246 ± 37 kJ mol -1 and the slope of the curves on the intense densification stage is around 0.33. Results are in agreement with densification by a grain-boundary diffusion mechanism as for conventional sintering and the contribution from the specific pressure-assisted mechanisms as for hot pressing is insignificant. This result suggests that exploration of mild SPS might prove rewarding in separation and control of the sintering mechanisms leading to production of specific ceramic with new or improved functionality.

AB - A methodology is proposed to investigate in detail shrinkage kinetics under isothermal spark plasma sintering (SPS) conditions applied to ceramic nano powders such as Y 2O 3 stabilized ZrO 2. To do so, mild SPS conditions were used (low temperatures and pressure, long dwell times). The extracted experimental activation energy has the value of 246 ± 37 kJ mol -1 and the slope of the curves on the intense densification stage is around 0.33. Results are in agreement with densification by a grain-boundary diffusion mechanism as for conventional sintering and the contribution from the specific pressure-assisted mechanisms as for hot pressing is insignificant. This result suggests that exploration of mild SPS might prove rewarding in separation and control of the sintering mechanisms leading to production of specific ceramic with new or improved functionality.

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KW - Grain boundary diffusion

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KW - Sintering kinetic

KW - Spark plasma sintering

KW - Zirconia

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Grain boundary diffusion driven spark plasma sintering of nanocrystalline zirconia

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Keywords

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