On the wide range of mechanical properties of ZTA and ATZ based dental ceramic composites by varying the Al2O3 and ZrO2 content

Nevárez-Rascón, Alfredo; Aguilar-Elguézabal, A.; Orrantia, E.; Bocanegra‐Bernal, M.H.

doi:10.1016/j.ijrmhm.2009.06.001

Cited by 133 publications

(56 citation statements)

References 48 publications

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“…This material combined the hardness and wear resistance of alumina with the fracture toughness and bending strength of zirconia 14,15) . Further, the addition of alumina helped suppress the propagation of phase transformation into the bulk of the material and increased the hydrothermal stability of the tetragonal phase 14,16) . Ban et al suggested that there were no changes in fracture toughness of ATZ after autoclaving, but the conventional Y-TZP showed a slight decreasing after autoclaving 11) .…”

Section: Introductionmentioning

confidence: 99%

Phase transformation of zirconia ceramics by hydrothermal degradation

Kawai

Wang

et al. 2011

Dent. Mater. J.

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Zirconia has found wide application in dentistry because of its high mechanical strength and superior esthetic properties. However, zirconia degradation caused by phase transformation occurring in a hydrothermal environment is of concern. In the present study, phase transformation and microstructure of tetragonal zirconia polycrystal partially stabilized with yttrium oxide (Y-TZP) and alumina-toughened zirconia (ATZ) sintered at different temperatures were estimated. On grazing angle X-ray diffraction analysis, ATZ showed less phase transformation to the monoclinic phase during hydrothermal treatment and this transformation appeared to occur within a few micrometers below the surface. At a higher sintering temperature the monoclinic phase content of ATZ was found to be lesser than that of Y-TZP, indicating that the alumina in ATZ was effective in suppressing hydrothermal degradation. Examination by transmission electron microscopy and studying of electron backscatter diffraction patterns indicated that grain growth in ATZ was slightly suppressed compared with that in Y-TZP at higher sintering temperatures. The present study demonstrated the effect of adding alumina to zirconia for suppressing hydrothermal degradation and studied the effect of this addition on grain growth in zirconia.

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Section: Introductionmentioning

confidence: 99%

Phase transformation of zirconia ceramics by hydrothermal degradation

Kawai

Wang

et al. 2011

Dent. Mater. J.

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“…Zirconia is in the monoclinic phase at ambient temperature and in tetragonal phase when heat is applied up to 1700 qC. Furthermore, at about 2370 qC, it is changes into a cubic phase [5]. The transformation of tetragonal to monoclinic phase will resulted in toughening mechanism of alumina zirconia composite materials and the system can be stabilized with the addition of some oxides materials in order to maintain the tetragonal phase in the ambient temperature [2,6].…”

Section: Introductionmentioning

confidence: 99%

“…This is because zirconia in tetragonal phase shows excellent mechanical properties. In addition, the transformation of tetragonal phase into monoclinic phase during cooling process will cause the volume increment that may lead to failure [5,6]. Failures also may cause by the presence of porosity, inhomogeneity in phase, grain size, micro-crack and any other failure possibilities which lowering the mechanical properties of the ceramics materials [7].…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of Stabilized Zirconia Toughened Alumina (ZTA) Doped Niobium Pentoxide (Nb2O5)

2016

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Abstract. The main target of this research is to study the mechanical properties of the Nb 2 O 5 doped with alumina-zirconia composites. Pellets form samples of ZTA (5YSZ) doped niobium pentoxide in varied amount of 0 wt%, 0.3 wt%, 0.5 wt% and 0.7 wt% were prepared by solid-state conventional method with respective 4:1 ratio or alumina and 5YSZ. The effect of different dopant addition on the morphology, phase transformation and hardness was studied. Each mixture of the compositions were calcined at 1000°C followed by pressing at 220 MPa and then they were sintered at 1650°C with heating rate 10°C min -1 and holding for 2 hours in air. Phase transformation, phase quantification and crystal structure analysis was revealed by using X-ray diffraction data with the help of X-Pert HighScore Plus software using Rietveld Refinement Method while microstructure was observed by scanning electron microscopy. The hardness of the composite is determined by using Vickers hardness test. It found that with 0.5 wt% niobium pentoxide addition would give a great effect on the microstructure distribution, densification and mechanical properties of the ZTA-doped sample.

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“…Alumina-zirconia ceramics have received considerable attention in both engineering and academic fields due to their improved mechanical properties when compared with pure alumina ceramics [1][2][3][4]. It has been proposed that the residual stresses due to thermal and elastic mismatches between alumina and zirconia could contribute to toughening and enhance the structural performance of these ceramic composites [5,6].…”

Section: Introductionmentioning

confidence: 99%

Residual Stress Measurements of Alumina-Zirconia Ceramics by Time-of-Flight Neutron Diffraction

Gurauskis

Baudı́n

Fan

et al. 2016

Residual Stresses 2016

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Abstract. Neutron strain scanning and Rietveld analysis were used to study the residual stresses in Al 2 O 3 /Y-TZP ceramic composites fabricated by different green processing techniques (a novel tape casting and conventional slip casting) and with different zirconia content. The results show that the residual stresses in zirconia particulates are tensile and the ones in alumina matrix are compressive, with almost flat through-thickness residual stress profiles in all bulk samples. The residual stresses for both phases were mainly dependent on the zirconia content, irrespective of the measurement direction and the fabrication process. IntroductionAlumina-zirconia ceramics have received considerable attention in both engineering and academic fields due to their improved mechanical properties when compared with pure alumina ceramics [1][2][3][4]. It has been proposed that the residual stresses due to thermal and elastic mismatches between alumina and zirconia could contribute to toughening and enhance the structural performance of these ceramic composites [5,6].Numerous works have been done on residual stresses analysis in Al 2 O 3 -ZrO 2 composites [6-10] and a wide range of results were obtained depending on fabrication routes, composition design and measurement techniques. In this study Al 2 O 3 /Y-TZP (alumina/tetragonal ZrO 2 stabilized with 3 mol% Y 2 O 3 ) composites were investigated. Samples were prepared by a novel tape casting route [11,12] for stacking green ceramic tapes made from high solid content of water-based slurries at room temperature and using low pressures. The conventional slip casting [13] was taken as reference for comparison. The effect of the Y-TZP content on the Al 2 O 3 /Y-TZP composites was also studied.Time-of-flight (TOF) neutron diffraction and Rietveld analysis have been applied for the nondestructive determination of the residual stresses in Al 2 O 3 /Y-TZP bulk samples. Through-thickness residual stress profiles corresponding to both phases, i.e. alumina and zirconia, were obtained, and compared to available data in the literature and to estimations by theoretical models. The effects of Y-TZP content and the new processing method on the microstructure and residual stresses of the ceramic composites were established.

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On the wide range of mechanical properties of ZTA and ATZ based dental ceramic composites by varying the Al2O3 and ZrO2 content

Cited by 133 publications

References 48 publications

Phase transformation of zirconia ceramics by hydrothermal degradation

Phase transformation of zirconia ceramics by hydrothermal degradation

Synthesis and Characterization of Stabilized Zirconia Toughened Alumina (ZTA) Doped Niobium Pentoxide (Nb2O5)

Residual Stress Measurements of Alumina-Zirconia Ceramics by Time-of-Flight Neutron Diffraction

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