Sintering of ultra-fine tetragonal yttria-stabilized zirconia ceramics

Kim, Hwan‐Cheol; Shon, In-Jin; Jeong, In-Kyoon; Ko, In-Yong; Munir, Zuhair A.

doi:10.1007/s10853-007-1888-z

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…In consequence, first, the final average grain sizes of the sintered samples were very close and with only small variations due to the very small ZrO 2 grains formed in the early sintering stage of nanocrystalline Y-TZP powders; second, the residual porosity (Fig. 3b) was low at the moment the isothermal threshold began (t=0); and, third, the sintering temperatures adopted in this study (1250-1400 °C) allowed only a moderate diffusivity compared to the usual sintering temperatures of 1500 to 1600 °C [6,20]. Therefore, the sintering of these nanoparticulate powders results in normal grain growth during the isothermal holding time, and refined microstructures were obtained under all sintering conditions studied.…”

Section: Resultsmentioning

confidence: 71%

“…However, there are some problems associated with the use of nanocrystalline ceramic powders, in particular the difficulty of eliminating aggregates and agglomerates, as well as the difficulty of compaction and control of grain growth during the sintering process. Starting in the 1990s, a number of companies developed easily compressible ZrO 2 nanosized powders, stabilized with 3 mol% Y 2 O 3 , with added binders [6,7]. Due to this scenario, a growing research interest exists to control grain growth during sintering and to evaluate the effects on the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

“…The use of nanosized ceramic powders is of great scientific and technological interest due to their increased sinterability, which may reduce the sintering temperature and/or time, also resulting in extremely fine-grained microstructures with improved mechanical properties. In the case of ZrO 2 -based ceramics, using nanosized particles, an improvement of the fracture toughness by microcracking has been reported [6][7][8][9]. Therefore, the sintering cycle has to be carefully chosen in order to take advantage of the unique properties of nanostructured materials.…”

Section: Introductionmentioning

confidence: 99%

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Influence of sintering parameters on the microstructure and mechanical properties of nanosized 3Y-TZP ceramics

et al. 2021

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The fracture toughness of 3Y-TZP ceramics obtained from a nanocrystalline powder with an optimized microstructure and highly transformable tetragonal grains was investigated. Samples of ZrO 2-3 mol% Y 2 O 3 were sintered at temperatures between 1250 and 1400 °C, with isothermal holding times of up to 16 h. Samples sintered at 1250 °C exhibited relative densities ranging between 92% and 98%, which increased with increasing isothermal duration, while samples sintered at 1300, 1350, or 1400 °C achieved densification higher than 98% for all isothermal treatments. Crystallographic analysis indicated the presence of a highly transformable ZrO 2-tetragonal phase (c/a√2= 1.0148-1.0154) for all conditions studied. The average grain size ranged from 0.18±0.04 mm (1250 °C-0 h) to 0.64±0.08 mm (1400 °C-16 h), indicating activation energy of 141.3 kJ/mol for grain growth and a growth exponent of 2.8. Both Vickers hardness (1025 to 1300 HV) and fracture toughness (4.0 to 7.8 MPa.m 1/2) increased with increasing sintering temperature and time due to increased densification, reduced porosity, and maintenance of potentially high fracture toughness by the t m phase transformation.

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Section: Resultsmentioning

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of sintering parameters on the microstructure and mechanical properties of nanosized 3Y-TZP ceramics

et al. 2021

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“…High-frequency induction heated sintering (HFIS) is a novel, rapid sintering method developed for the fabrication of ceramics and composites. In HFIS, a high-frequency alternating current passes through an induction coil to generate a rapidly changing electromagnetic field, resulting in accelerated densification and reduced processing times 10 . Induced eddy currents within conductive components, such as metal powders or carbon fibers, generate resistive heating and a localized temperature rise 11 .…”

Section: Introductionmentioning

confidence: 99%

Effect of high-speed sintering on the marginal and internal fit of CAD/CAM-fabricated monolithic zirconia crowns

Lee,

Choi,

Choi

et al. 2023

Sci Rep

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This study compared the marginal and internal fit of zirconia crowns fabricated using conventional and high-speed induction sintering. A typodont mandibular right first molar was prepared and 60 zirconia crowns were fabricated: 30 crowns using conventional sintering and 30 crowns using high-speed sintering. We presented a new evaluation methodology to measure the marginal and internal fit of restorations through digital scanning, aligning the two datasets, and measuring the distance between two arbitrary point sets of the datasets. For the marginal fit, we calculated the maximum values of the shortest distances between the marginal line of the prepared tooth and that of the crown. The calculated values ranged from 359 to 444 μm, with smaller values for the high-speed sintered crowns (P < 0.05). For the internal fit, we employed mesh sampling and computed the geodesic distances between the prepared tooth surface and the crown intaglio surface. The measured values ranged from 177 to 229 μm with smaller values for the high-speed sintered crowns, but no significant difference was found (P > 0.05). Based on our results, the high-speed sintering method can be considered a promising option for single-visit zirconia treatment in dental practice.

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“…The stabilisation of these ceramics with rare earth oxides (RE2O3) induces the substitution of a cation Hf 4+ by a cation RE 3+ . The stabilisation of zirconia with low content yttria has been widely studied in the literature [6,[21][22][23][24][25][26][27][28], but only few studies deal with HfO2-based materials and their stabilisation with rare earth oxides (at low content). i.e.…”

Section: Introductionmentioning

confidence: 99%

Chemical and microstructural characterisation of HfO2-Y2O3 ceramics with high amount of Y2O3 (33, 40 and 50 mol. %) manufactured using spark plasma sintering

Audouard

Tsoutsouva

Horezan

et al. 2023

Journal of the European Ceramic Society

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Sintering of ultra-fine tetragonal yttria-stabilized zirconia ceramics

Cited by 8 publications

References 27 publications

Influence of sintering parameters on the microstructure and mechanical properties of nanosized 3Y-TZP ceramics

Influence of sintering parameters on the microstructure and mechanical properties of nanosized 3Y-TZP ceramics

Effect of high-speed sintering on the marginal and internal fit of CAD/CAM-fabricated monolithic zirconia crowns

Chemical and microstructural characterisation of HfO2-Y2O3 ceramics with high amount of Y2O3 (33, 40 and 50 mol. %) manufactured using spark plasma sintering

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