The Grain Size Dependence of the Mechanical Properties in TZP Ceramics

Wang, J.; Rainforth, Mark W.; Stevens, R.

doi:10.1007/978-94-009-1139-0_31

Cited by 30 publications

(41 citation statements)

References 21 publications

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“…Therefore, the extent of toughening (and hence the fracture energy) should scale with grain size in zirconia-toughened ceramics. Such an increase in fracture toughness has indeed been observed by Wang et al [45] for 2.5Y-TZP upon increasing the grain size from 0.75 lain to 1.3 gm. Irreversible t--*m transformation was observed in their samples and the toughening increment was in good agreement with theoretical models based on a supercritical, irreversible, dilatational transformation [46,47].…”

Section: Toughness Of Y Ce-tzpsupporting

confidence: 77%

The effect of ceria co-doping on chemical stability and fracture toughness of Y-TZP

Boutz

Winnubst

Langerak

et al. 1995

JOURNAL OF MATERIALS SCIENCE

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The fracture toughness and ageing resistance of yttria, ceria-stabilized tetragonal zirconia polycrystals (Y, Ce-TZP) were evaluated as a function of grain size and ceria content. Very fine grained, fully dense materials could be produced by sinter forging at relatively low temperatures (11 50-1200 ~ The ageing resistance in hot water (185 ~ of 2 mol % Y203 -stabilized TZP is strongly enhanced by alloying with ceria. The ceria content necessary to avoid degradation completely, decreases with grain size. The toughness of fully dense Y, Ce-TZP is 7-9 MPa m 1/2 for grain sizes down to 0.2 ~tm. No or very little transformation took place during fracturing and no clear variation with grain size was observed for the toughness at grain sizes up to 0.8 pm. Reversible transformation and crack deflection may explain the observed toughness values.

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Section: Toughness Of Y Ce-tzpsupporting

confidence: 77%

The effect of ceria co-doping on chemical stability and fracture toughness of Y-TZP

Boutz

Winnubst

Langerak

et al. 1995

JOURNAL OF MATERIALS SCIENCE

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“…This is in good agreement with the calculated value. The values for Vf(h) 1/2 as reported by Wang et al [8] and Masaki and Sinjo [3,1 are lower (~ 1.5-2 gml/2). This may be due to the fact that they measured zone sizes by means of XRD while our zone sizes are obtained by Raman spectroscopy.…”

Section: ~6mentioning

confidence: 83%

“…As shown by a number of authors the width of the transformation zone decreases with an increase in test temperature and a decrease in grain size [3,8,14,15]. Tsukuma and Ueda [2] showed that, when the size of the transformation zone is large, a value as high as 1400 MPa is obtained for the bending strength and 20 MPa m-1/2 for the fracture toughness (for 2 mol % Y2 03 doped ZrO2).…”

Section: Introductionmentioning

confidence: 99%

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Mechanical properties of ultra-fine grained zirconia ceramics

et al. 1992

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The mechanical properties of tetragonal zirconia (TZP) materials doped with Y, Ce or Ti were studied as a function of temperature and grain size. Fine grained Y-TZP (grain size < 0.3 ttm) shows values for fracture toughness and strength at room temperature, which are comparable with the coarse grained transformation toughened materials, despite lacking transformation toughening. The morphology of the fracture surface points to crack deflection as the most important toughening mechanism. At 800 ~ fracture toughness and strength are higher than in coarse grained Y-TZP materials. Doping Y-TZP with Ce or Ti results in a similar trend in mechanical properties, for fine grained material, as for the Y-TZP materials.

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“…When transformation toughening increases, the strength is also improved if the defect size is unchanged. However, when the transformation stress becomes relatively small and the transformed volume is not only confined near sharp cracks, the transition between the flaw-limited to the transformation-limited strength regimes takes place [54].…”

Section: Effect Of the Sintering Temperaturementioning

confidence: 99%

Enhanced reliability of yttria-stabilized zirconia for dental applications

et al. 2015

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An increasing number of dental applications based on yttria-stabilized zirconia (3Y-TZP) have been developed in recent years as a result of the advances and versatility of dry-processing and soft machining at the pre-sintered state. Nonetheless, the long-term surface stability of these materials in humid environment is still a matter of concern and may limit its application. In this work, a simple method to prevent hydrothermal degradation on zirconia surface is studied in detail. This method involves the infiltration of pre-sintered parts with optimized solutions containing Ce salts, leaving unchanged the other processing steps, allowing the diffusion of Ce during conventional sintering. Several pre-sintering conditions, solution concentrations and sintering temperatures were studied and characterized, obtaining working parameters for the production of zirconia parts with mechanical properties similar to standard 3Y-TZP and high resistance to hydrothermal aging. This optimal combination was obtained with the 1150 ºC pre-sintering temperature, 50 wt% solution and sintering at 1450 ºC, leading to a superficial CeO 2 content of about 3 mol%.

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The Grain Size Dependence of the Mechanical Properties in TZP Ceramics

Cited by 30 publications

References 21 publications

The effect of ceria co-doping on chemical stability and fracture toughness of Y-TZP

The effect of ceria co-doping on chemical stability and fracture toughness of Y-TZP

Mechanical properties of ultra-fine grained zirconia ceramics

Enhanced reliability of yttria-stabilized zirconia for dental applications

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