Thermal stability and field assisted sintering of cerium-doped YSZ ceramic nanoparticles obtained via a hydrothermal process

Dumitru V. Dragut, Viorel Badilita, Adrian M. Motoc, Radu R. Piticescu, Jie Zhao, Hasan Hijji, Luca Conte

Research output: Contribution to journalArticle

Abstract

Owing to its extraordinary range of properties, yttria-doped zirconia holds a unique place among the ceramic oxide systems. To improve the properties for some specific custom design applications, co-doping with other rare earth oxides such as ceria is needed. The aim of this paper is to identify the correlations between the phase composition evolution with increasing thermal treatment temperature in order to establish the thermal stability in connection with the ceria content and how does it influence the yttria-stabilised zirconia microstructure. The ZrO2–3Y2O3–nCeO2 (n = 3, 6 and 9 wt.%) samples were obtained by a hydrothermal process and submitted to a thermal treatment up to 1600 °C. Intensive characterization was performed via X-ray powder diffraction and EDX analysis. It was found that up to 400 °C, a monophasic structure was formed. At higher temperatures tetragonal zirconia is formed as a major phase with the presence of secondary monoclinic and cubic phases, depending on the Ce content and thermal treatment temperature. Sintered compacts with densities up to 99.5% from the theoretical density were obtained starting from the 6%CeO2–3%Y2O3–ZrO2-nanostructured powders using a special field-assisted (FAST) sintering process. With increasing CeO2 content to 9% only, tetragonal zirconia with 6–9 nm crystallite sizes is formed during the FAST sintering process.
LanguageEnglish
Article number11
Number of pages7
JournalManufacturing Review
Volume4
DOIs
Publication statusPublished - 14 Aug 2017

Fingerprint

Spark plasma sintering
Cerium
Zirconia
Thermodynamic stability
Heat treatment
Cerium compounds
Nanoparticles
Oxides
Yttrium oxide
Yttria stabilized zirconia
Crystallite size
Phase composition
X ray powder diffraction
Temperature
Rare earths
Energy dispersive spectroscopy
Doping (additives)
Powders
Microstructure

Keywords

  • zirconia
  • hydrothermal
  • thermal stability
  • agglomerated nanoparticles
  • field assisted sintering

Cite this

Dragut, Dumitru V. ; Badilita, Viorel ; Motoc, Adrian M. ; Piticescu, Radu R. ; Zhao, Jie ; Hijji, Hasan ; Conte, Luca. / Thermal stability and field assisted sintering of cerium-doped YSZ ceramic nanoparticles obtained via a hydrothermal process. In: Manufacturing Review . 2017 ; Vol. 4.
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Thermal stability and field assisted sintering of cerium-doped YSZ ceramic nanoparticles obtained via a hydrothermal process. / Dragut, Dumitru V.; Badilita, Viorel; Motoc, Adrian M.; Piticescu, Radu R.; Zhao, Jie; Hijji, Hasan; Conte, Luca.

In: Manufacturing Review , Vol. 4, 11, 14.08.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Thermal stability and field assisted sintering of cerium-doped YSZ ceramic nanoparticles obtained via a hydrothermal process

AU - Dragut, Dumitru V.

AU - Badilita, Viorel

AU - Motoc, Adrian M.

AU - Piticescu, Radu R.

AU - Zhao, Jie

AU - Hijji, Hasan

AU - Conte, Luca

PY - 2017/8/14

Y1 - 2017/8/14

N2 - Owing to its extraordinary range of properties, yttria-doped zirconia holds a unique place among the ceramic oxide systems. To improve the properties for some specific custom design applications, co-doping with other rare earth oxides such as ceria is needed. The aim of this paper is to identify the correlations between the phase composition evolution with increasing thermal treatment temperature in order to establish the thermal stability in connection with the ceria content and how does it influence the yttria-stabilised zirconia microstructure. The ZrO2–3Y2O3–nCeO2 (n = 3, 6 and 9 wt.%) samples were obtained by a hydrothermal process and submitted to a thermal treatment up to 1600 °C. Intensive characterization was performed via X-ray powder diffraction and EDX analysis. It was found that up to 400 °C, a monophasic structure was formed. At higher temperatures tetragonal zirconia is formed as a major phase with the presence of secondary monoclinic and cubic phases, depending on the Ce content and thermal treatment temperature. Sintered compacts with densities up to 99.5% from the theoretical density were obtained starting from the 6%CeO2–3%Y2O3–ZrO2-nanostructured powders using a special field-assisted (FAST) sintering process. With increasing CeO2 content to 9% only, tetragonal zirconia with 6–9 nm crystallite sizes is formed during the FAST sintering process.

AB - Owing to its extraordinary range of properties, yttria-doped zirconia holds a unique place among the ceramic oxide systems. To improve the properties for some specific custom design applications, co-doping with other rare earth oxides such as ceria is needed. The aim of this paper is to identify the correlations between the phase composition evolution with increasing thermal treatment temperature in order to establish the thermal stability in connection with the ceria content and how does it influence the yttria-stabilised zirconia microstructure. The ZrO2–3Y2O3–nCeO2 (n = 3, 6 and 9 wt.%) samples were obtained by a hydrothermal process and submitted to a thermal treatment up to 1600 °C. Intensive characterization was performed via X-ray powder diffraction and EDX analysis. It was found that up to 400 °C, a monophasic structure was formed. At higher temperatures tetragonal zirconia is formed as a major phase with the presence of secondary monoclinic and cubic phases, depending on the Ce content and thermal treatment temperature. Sintered compacts with densities up to 99.5% from the theoretical density were obtained starting from the 6%CeO2–3%Y2O3–ZrO2-nanostructured powders using a special field-assisted (FAST) sintering process. With increasing CeO2 content to 9% only, tetragonal zirconia with 6–9 nm crystallite sizes is formed during the FAST sintering process.

KW - zirconia

KW - hydrothermal

KW - thermal stability

KW - agglomerated nanoparticles

KW - field assisted sintering

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JO - Manufacturing Review

T2 - Manufacturing Review

JF - Manufacturing Review

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ER -