The effect of forming stresses on the sintering of ultra-fine Ce0.9Gd0.1O2-δ powders

Julie Glasscock, Vincenzo Esposito, Søren Preben Vagn Foghmoes, Tobias Stegk, David Matuschek, Mikkel Wennemoes Hvitfeld Ley, Severine Ramousse

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The effect of particle and pore arrangement on sintering and densification of ultra-fine (∼130nm) Ce0.9Gd0.1O2-δ powder was evaluated. The common understanding that higher initial density of a ceramic network leads to a higher sintered density is not valid for fine powders, which have extremely good sinterability when there is a favourable particle packing. The effect of the applied stresses during forming (which produce different particle packing arrangements) was investigated by forging green bodies by different shaping techniques, including casting, and cold isostatic pressing. Samples formed with techniques that apply low levels of stress had a particle arrangement which significantly enhanced sintering at low temperature, compared to those prepared by high stress techniques. The sample geometry, heat treatment for organic removal and the initial density of the green body had a negligible effect on the final density when the ratio of the pore size to particle size was around 1. © 2013 Elsevier Ltd.
Original languageEnglish
JournalJournal of the European Ceramic Society
Volume33
Issue number7
Pages (from-to)1289-1296
ISSN0955-2219
DOIs
Publication statusPublished - 2013

Keywords

  • Casting
  • Ceramic materials
  • Cerium compounds
  • Gadolinium
  • Porosity
  • Powders
  • Slurries
  • Upsetting (forming)
  • Sintering

Cite this

Glasscock, Julie ; Esposito, Vincenzo ; Foghmoes, Søren Preben Vagn ; Stegk, Tobias ; Matuschek, David ; Ley, Mikkel Wennemoes Hvitfeld ; Ramousse, Severine. / The effect of forming stresses on the sintering of ultra-fine Ce0.9Gd0.1O2-δ powders. In: Journal of the European Ceramic Society. 2013 ; Vol. 33, No. 7. pp. 1289-1296.
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title = "The effect of forming stresses on the sintering of ultra-fine Ce0.9Gd0.1O2-δ powders",
abstract = "The effect of particle and pore arrangement on sintering and densification of ultra-fine (∼130nm) Ce0.9Gd0.1O2-δ powder was evaluated. The common understanding that higher initial density of a ceramic network leads to a higher sintered density is not valid for fine powders, which have extremely good sinterability when there is a favourable particle packing. The effect of the applied stresses during forming (which produce different particle packing arrangements) was investigated by forging green bodies by different shaping techniques, including casting, and cold isostatic pressing. Samples formed with techniques that apply low levels of stress had a particle arrangement which significantly enhanced sintering at low temperature, compared to those prepared by high stress techniques. The sample geometry, heat treatment for organic removal and the initial density of the green body had a negligible effect on the final density when the ratio of the pore size to particle size was around 1. {\circledC} 2013 Elsevier Ltd.",
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author = "Julie Glasscock and Vincenzo Esposito and Foghmoes, {S{\o}ren Preben Vagn} and Tobias Stegk and David Matuschek and Ley, {Mikkel Wennemoes Hvitfeld} and Severine Ramousse",
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The effect of forming stresses on the sintering of ultra-fine Ce0.9Gd0.1O2-δ powders. / Glasscock, Julie; Esposito, Vincenzo; Foghmoes, Søren Preben Vagn; Stegk, Tobias; Matuschek, David; Ley, Mikkel Wennemoes Hvitfeld; Ramousse, Severine.

In: Journal of the European Ceramic Society, Vol. 33, No. 7, 2013, p. 1289-1296.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - The effect of forming stresses on the sintering of ultra-fine Ce0.9Gd0.1O2-δ powders

AU - Glasscock, Julie

AU - Esposito, Vincenzo

AU - Foghmoes, Søren Preben Vagn

AU - Stegk, Tobias

AU - Matuschek, David

AU - Ley, Mikkel Wennemoes Hvitfeld

AU - Ramousse, Severine

PY - 2013

Y1 - 2013

N2 - The effect of particle and pore arrangement on sintering and densification of ultra-fine (∼130nm) Ce0.9Gd0.1O2-δ powder was evaluated. The common understanding that higher initial density of a ceramic network leads to a higher sintered density is not valid for fine powders, which have extremely good sinterability when there is a favourable particle packing. The effect of the applied stresses during forming (which produce different particle packing arrangements) was investigated by forging green bodies by different shaping techniques, including casting, and cold isostatic pressing. Samples formed with techniques that apply low levels of stress had a particle arrangement which significantly enhanced sintering at low temperature, compared to those prepared by high stress techniques. The sample geometry, heat treatment for organic removal and the initial density of the green body had a negligible effect on the final density when the ratio of the pore size to particle size was around 1. © 2013 Elsevier Ltd.

AB - The effect of particle and pore arrangement on sintering and densification of ultra-fine (∼130nm) Ce0.9Gd0.1O2-δ powder was evaluated. The common understanding that higher initial density of a ceramic network leads to a higher sintered density is not valid for fine powders, which have extremely good sinterability when there is a favourable particle packing. The effect of the applied stresses during forming (which produce different particle packing arrangements) was investigated by forging green bodies by different shaping techniques, including casting, and cold isostatic pressing. Samples formed with techniques that apply low levels of stress had a particle arrangement which significantly enhanced sintering at low temperature, compared to those prepared by high stress techniques. The sample geometry, heat treatment for organic removal and the initial density of the green body had a negligible effect on the final density when the ratio of the pore size to particle size was around 1. © 2013 Elsevier Ltd.

KW - Casting

KW - Ceramic materials

KW - Cerium compounds

KW - Gadolinium

KW - Porosity

KW - Powders

KW - Slurries

KW - Upsetting (forming)

KW - Sintering

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