Stabilization of tetragonal phase in polycrystalline zirconia

Gupta, T. K.; Bechtold, J.H.; Kuznicki, R. C.; Cadoff, L. H.; Rossing, B. R.

doi:10.1007/bf00553928

Cited by 378 publications

(115 citation statements)

References 5 publications

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“…X-ray diffraction has been often used to quantify the crystalline zirconia phases; however some inconsistent results regarding the peaks of tetragonal, cubic and monoclinic phases have been continuously referred and compared among papers [26][27][28][29] . In this study, the presintered specimens showed tetragonal and monoclinic phases in an amount allowed by the ISO 13356 30) .…”

Section: Discussionmentioning

confidence: 99%

Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding

et al. 2017

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This study evaluated microstructural and crystallographic phase changes after grinding (G) and regeneration firing/anneling (R) of Y-TZP ceramics. Thirty five bars (Lava TM and Ice Zirkon) were divided: Y-TZP pre-sintered, control (C), regeneration firing (R), dry grinding (DG), dry grinding+regeneration firing (DGR), wet grinding (WG) and wet grinding+regeneration firing (WGR). Grinding was conducted using a diamond bur and annealing at 1,000°C. The microstructure was analyzed by SEM and the crystalline phases by X-ray diffraction (XRD). XRD showed that pre-sintered specimens contained tetragonal and monoclinic phases, while groups C and R showed tetragonal, cubic and monoclinic phases. After grinding, the cubic phase was eliminated in all groups. Annealing (DGR and WGR) resulted in only tetragonal phase. SEM showed semi-circular cracks after grinding and homogenization of particles after annealing. After grinding, surfaces show tetragonal and monoclinic phases and R can be assumed to be necessary prior to porcelain layering when grinding is performed.

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Section: Discussionmentioning

confidence: 99%

Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding

et al. 2017

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“…5, 1550010 (2015) stabilizes the cubic phase. 15 When an identical Zr 1Àx Al x O 2Àx=2 composition spread was annealed at 1000 C for 20 s in N 2 , Zr-rich compositions (x < 0:18) exhibited a mixture of monoclinic and tetragonal phases while for 0:18 < x < 0:40 the structure was entirely cubic, a result that is not inconsistent with expected equilibrium behavior. For x > 0:4 a mixture of cubic and amorphous material was present.…”

Section: Experimental Methodsmentioning

confidence: 83%

Dielectric properties of amorphous Zr–Al–O and Zr-Si-O thin films

et al. 2015

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We have systematically studied the composition dependence of the dielectric properties of Zr 1Àx Al x O 2Àx=2 and Zr 1Àx Si x O 2 . An essentially linear variation of the static dielectric constant, " s , was observed as a function of composition, x, for compositions rich in the p-block element, i.e., x > 0:4, for both chemical systems. However an abrupt change in " s is found near x % 0:35, associated with the onset of crystallinity in as-deposited films. Breakdown fields do not show a comparable composition dependence. Measurements of the index of refraction at optical frequencies, combined with a simple Clausius-Mossotti interpretation, indicates that low-frequency (ionic) contributions to the polarizability exhibit systematic deviation with respect to values linearly interpolated from the endmembers. These trends are not consistently affected by the presence of crystalline order, but are related to changes associated with heterogeneous local oxygen coordination and bonding.

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“…Among them, fine grained Y2O3-PSZ reportedly has (3) an excellent strength beyond 1 GPa. It is well known that the stress-induced martensitic transformation from tetragonal (t-ZrO2) to monoclinic phase (m-ZrO2) is responsible for the toughness(4)- (6), the mechanism of which has been discussed (7).…”

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confidence: 99%

Effect of Heterogeneities on the Microstructural and Phase Changes of ZrO2-2.5 mol%Y2O3 by Annealing

Yoshikawa

Sutô

1985

Trans. JIM

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The present work was carried out in order to clarify the heterogeneities in the structure of a commercial PSZ containing 2.5 mol% Y2O3 and to observe the microstructural changes with post annealing.Besides existence of coagulated Al2O3 inclusions, it was found that Y2O3 concentration in the comWhen the compact was annealed at 1673K, grains in the Y2O3 enriched zone (cubic ZrO2) grew preferentially.The difference in Y2O3 concentration between cubic and tetragonal grains decreased with rising annealing temperature, and they became almost equal in the concentration at 2243 K, eventually. The observation of these annealed structures was carried out by means of SEM and TEM.

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Stabilization of tetragonal phase in polycrystalline zirconia

Cited by 378 publications

References 5 publications

Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding

Y-TZP zirconia regeneration firing: Microstructural and crystallographic changes after grinding

Dielectric properties of amorphous Zr–Al–O and Zr-Si-O thin films

Effect of Heterogeneities on the Microstructural and Phase Changes of ZrO<SUB>2</SUB>-2.5 mol%Y<SUB>2</SUB>O<SUB>3</SUB> by Annealing

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