Liquid Phase Sintering of Y-TZP with CuO and Y&lt;sub&gt;2&lt;/sub&gt;Cu&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; Dopants

Hayakawa, Motozo; Inoue, Takashi; Pee, Jae-Hwan; Onda, Tetsuhiko; Suematsu, Hisayuki; Yamauchi, Hisashi

doi:10.4028/www.scientific.net/msf.304-306.465

Cited by 6 publications

(5 citation statements)

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“…3 and 4) is clearly caused by an irreversible reaction between CuO and the 3Y-TZP grains. A similar irreversible exothermic signal was also observed by Seidensticker and Mayo 9 and Hayakawa et al 11 on their study of CuO-doped 3Y-TZP systems. Seidensticker did not assign any reaction to this signal.…”

Section: General Discussion On Sintering Of Cuo-doped 3y-tzp Nano-nansupporting

confidence: 73%

“…It is obvious that the solubility of CuO in a 3Y-TZP matrix is strongly influenced by its grain-boundary volume so ceramic grain size. Hayakawa and colleagues 11 investigated reactions in 3Y-TZP doped with various amounts of CuO prepared by traditional mixing techniques. Differently from Seidensticker's results, 9 these authors concluded that in their systems the formation of Y 2 Cu 2 O 5 occurs at around 850 • C during heating and that CuO dissolves in the 3Y-TZP matrix at around 1200 • C. The discrepancy between Seidensticker's and Hayakawa's work might be caused by the different characteristics of the powders they used, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…[2][3][4] During sintering of CuO-doped Y-TZP systems several reactions occur. [4][5][6][7][8][9][10][11] These reactions have profound influences not only on sintering behaviour but also on the microstructure of the final ceramic. It is observed in course-grained systems that these reactions retard densification [4][5][6] and result in a tetragonal to monoclinic zirconia phase transformation during sintering.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of reactions during sintering of CuO-doped 3Y-TZP nano-powder composites

Winnubst

Ran

Speets

et al. 2009

Journal of the European Ceramic Society

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Section: General Discussion On Sintering Of Cuo-doped 3y-tzp Nano-nansupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Analysis of reactions during sintering of CuO-doped 3Y-TZP nano-powder composites

Winnubst

Ran

Speets

et al. 2009

Journal of the European Ceramic Society

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“…This is in good agreement with the work of Lemaire et al 16 . and Hayakawa et al ., 17 who observed that an addition of more than 0.3 mol% of CuO results in the formation of monoclinic zirconia after sintering.…”

Section: Resultsmentioning

confidence: 90%

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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“…The addition of transition metal into zirconia ceramics often improve the sintering ability of the powder [1][2][3]. For example, a CuO addition into zirconia reduced the sintering temperature by 200 and thus resulted in smaller grain size, higher toughness and lower bending strength [4]. CuO dopant brings about liquid phase sintering for zirconia; an amorphous phase was observed at grain boundaries and triple junctions [5].…”

Section: Introductionmentioning

confidence: 99%

Effect of CoO Doping on the Sintering Ability and Mechanical Properties of Y-TZP

Onda

Yamauchi

Hayakawa

2004

MSF

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The effect of CoO addition into Y-TZP (Yttria doped Tetragonal Zirconia Polycrystals) was studied on the evolution of its sintering ability, grain size, grain boundary structure and mechanical properties. The doping of a small amount of CoO effectively reduced the sintering temperature. A small amount of CoO up to ~ 0.3 mol% was effective for the suppression of grain growth, but the addition of 1.0 mole % resulted in an enhanced grain growth. The hardness and toughness of the CoO doped TZP were about the same as those of undoped TZP. Furthermore, despite the grain refinement, CoO doped TZP did not exhibit improved mechanical properties. This may be suggesting that CoO dopant had weakened the grain boundary strength.

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Liquid Phase Sintering of Y-TZP with CuO and Y<sub>2</sub>Cu<sub>2</sub>O<sub>5</sub> Dopants

Cited by 6 publications

References 0 publications

Analysis of reactions during sintering of CuO-doped 3Y-TZP nano-powder composites

Analysis of reactions during sintering of CuO-doped 3Y-TZP nano-powder composites

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

Effect of CoO Doping on the Sintering Ability and Mechanical Properties of Y-TZP

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