Densification of zirconia-hematite nanopowders

Raming, Tomas P.; Winnubst, Louis; Zyl, Werner E. van; Verweij, H.

doi:10.1016/s0955-2219(02)00272-8

Cited by 20 publications

(7 citation statements)

References 19 publications

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“…During this dissolution, the ion mobility in the 3Y‐TZP grains and especially in the grain boundary region increases. This high ion mobility or ion diffusivity can be related to a high grain‐boundary diffusion, which results in a higher densification rate, 18 and consequently leads to a start of densification at a lower temperature. If the dissolution proceeded completely, 0.3 mol% of CuO would have been dissolved in the Y‐TZP matrix while 0.5 mol% of CuO remained as a separate phase.…”

Section: Discussionmentioning

confidence: 99%

Sintering Behavior of 0.8 mol%‐CuO‐Doped 3Y‐TZP Ceramics

Ran

Winnubst

Wiratha

et al. 2005

Journal of the American Ceramic Society

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In recent years, 3 mol% yttria‐stabilized tetragonal zirconia polycrystals (3Y‐TZP) doped with copper oxide has obtained increasing interest due to its enhanced superplastisity and good potential in tribological applications. In this work, the effect of addition of small amounts (0.8 mol%) of copper oxide on the sintering behavior of 3Y‐TZP was studied using a dilatometer and high‐temperature X‐ray diffraction (XRD). A qualitative sintering model was established based on several reactions during sintering as indicated by thermal analysis and XRD. Some of these reactions remarkably retard densification and consequently result in low final density (86%) of the sample sintered at 1400°C in air. The reaction between molten Cu2O and yttria as segregated to the Y‐TZP grain boundaries at around 1180°C leads to the depletion of yttria from Y‐TZP grains, which results in the formation of monoclinic phase during cooling. A relatively higher oxygen partial pressure can inhibit the dissociation of CuO to Cu2O. This inhibition in dissociation is one of the reasons why a dense (>96%) 0.8 mol% CuO‐doped 3Y‐TZP ceramic can be obtained after sintering at 1400°C in flowing oxygen.

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Section: Discussionmentioning

confidence: 99%

Sintering Behavior of 0.8 mol%‐CuO‐Doped 3Y‐TZP Ceramics

Ran

Winnubst

Wiratha

et al. 2005

Journal of the American Ceramic Society

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“…For example, nanocrystalline YSZ exhibits superior mechanical, electrical and thermal properties as compared to its conventional coarsegrained counterpart. There are multiple advantages of nanostructured conducting materials as compared to their coarse ones in their applications: the nano-structured materials can effectively increase the surface area for catalytic reaction and electrode reaction, and result in an increase in the catalytic activity for oxidation and electrode performance (SOFC, zincair battery, sensor) [19,20]; nano-structure materials can also greatly reduce the necessary sintering temperature for pellet densification [21], which is beneficial for their application in ceramic oxygen/hydrogen separation membrane, electrolyte in SOFC and oxygen pump, and interconnect material for SOFC.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of nanocrystalline conducting composite oxides based on a non-ion selective combined complexing process for functional applications

Zhou

Jin

2006

Journal of Alloys and Compounds

120

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“…14,16 The low onset temperature can be attributed to the dissolution of CuO in the Y-TZP matrix by forming CuO-rich grain boundaries in the zirconia grains, 18,19 which increases the ion mobility of zirconia grains and especially the grain boundary region. 16,20 The higher ion mobility results in activation in sintering of the zirconia grains and therefore the onset of densification shifts towards lower temperatures.…”

Section: Fast Densification Of Cuo Doped 3y-tzp In Sintering Stage Imentioning

confidence: 99%