Effects of sintering on the mechanical and ionic properties of ceria-doped scandia stabilized zirconia ceramic

S. Ramesh, C. K. Ng, C. Y. Tan, W. H. Wong, C. Y. Ching, Andanastuti Muchtar, Mahendra Rao Somalu, S. Ramesh, Hari Chandran, P. Devaraj

Research output: Contribution to journalArticle

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Abstract

The effect of conventional sintering from 1300 to 1550C on the properties of 1mol% ceria-doped scandia stabilized zirconia was investigated. In addition, the influence of rapid sintering via microwave technique at low temperature regimes of 1300C and 1350C for 15min on the properties of this zirconia was evaluated. It was found that both sintering methods yielded highly dense samples with minimum relative density of 97.5%. Phase analysis by X-ray diffraction revealed the presences of only cubic phase in all sintered samples. All sintered pellets possessed high Vickers hardness (13-14.6GPa) and fracture toughness (~3MPam1/2). Microstructural examination by using the scanning electron microscope revealed that the grain size varied from 2.9 to 9.8μm for the conventional-sintered samples. In comparison, the grain size of the microwave-sintered zirconia was maintained below 2μm. Electrochemical Impedance Spectroscopy study showed that both the bulk and grain boundary resistivity of the zirconia decreases with increasing test temperature regardless of sintering methods. However, the grain boundary resistivity of the microwave-sintered samples was higher than the conventional-sintered ceramic at 600C and reduced significantly at 800C thus resulting in the enhancement of electrical conduction.

Original languageEnglish
JournalCeramics International
DOIs
Publication statusAccepted/In press - 21 May 2016

Fingerprint

Scandium
Cerium compounds
Zirconia
Sintering
Microwaves
Grain boundaries
Vickers hardness
Electrochemical impedance spectroscopy
Fracture toughness
Electron microscopes
Scanning
X ray diffraction
Temperature
zirconium oxide

Keywords

  • Ionic conductivity
  • Mechanical property
  • Microwave sintering
  • Scandia stabilized zirconia

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Effects of sintering on the mechanical and ionic properties of ceria-doped scandia stabilized zirconia ceramic. / Ramesh, S.; Ng, C. K.; Tan, C. Y.; Wong, W. H.; Ching, C. Y.; Muchtar, Andanastuti; Somalu, Mahendra Rao; Ramesh, S.; Chandran, Hari; Devaraj, P.

In: Ceramics International, 21.05.2016.

Research output: Contribution to journalArticle

Ramesh, S. ; Ng, C. K. ; Tan, C. Y. ; Wong, W. H. ; Ching, C. Y. ; Muchtar, Andanastuti ; Somalu, Mahendra Rao ; Ramesh, S. ; Chandran, Hari ; Devaraj, P. / Effects of sintering on the mechanical and ionic properties of ceria-doped scandia stabilized zirconia ceramic. In: Ceramics International. 2016.
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AU - Ching, C. Y.

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AB - The effect of conventional sintering from 1300 to 1550C on the properties of 1mol% ceria-doped scandia stabilized zirconia was investigated. In addition, the influence of rapid sintering via microwave technique at low temperature regimes of 1300C and 1350C for 15min on the properties of this zirconia was evaluated. It was found that both sintering methods yielded highly dense samples with minimum relative density of 97.5%. Phase analysis by X-ray diffraction revealed the presences of only cubic phase in all sintered samples. All sintered pellets possessed high Vickers hardness (13-14.6GPa) and fracture toughness (~3MPam1/2). Microstructural examination by using the scanning electron microscope revealed that the grain size varied from 2.9 to 9.8μm for the conventional-sintered samples. In comparison, the grain size of the microwave-sintered zirconia was maintained below 2μm. Electrochemical Impedance Spectroscopy study showed that both the bulk and grain boundary resistivity of the zirconia decreases with increasing test temperature regardless of sintering methods. However, the grain boundary resistivity of the microwave-sintered samples was higher than the conventional-sintered ceramic at 600C and reduced significantly at 800C thus resulting in the enhancement of electrical conduction.

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