Nature inspired dough processing of alumina-zirconia composites: Rheology, plasticity and weibull analysis towards net shaping

Seesala, Venkata Sundeep; Dhara, Santanu

doi:10.1016/j.jeurceramsoc.2021.07.019

Cited by 8 publications

(16 citation statements)

References 64 publications

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“…These results also match with those reported for dental ceramics made of alumina, 3YSZ and their composites (8,30,31). Flexural strength and Weibull analysis was performed in the previous study, where the three-point flexural strength of the extruded alumina and YSZ achieved was 408.3 ± 61.47 MPa and 690.5 ± 51.5 MPa, respectively (15). The Weibull analysis on the flexural strength of sintered alumina resulted in modulus 5.4 with the scale parameter of 404.6 MPa, whereas for Zirconia, the modulus is 10.02 with the scale parameter of 665.17 Mpa (15).…”

Section: Density and Hardnesssupporting

confidence: 88%

“…In addition, they are aligned parallel to the occlusal plane, where the effect on the fracture toughness would be minimal. Since the blanks were prepared by molding the dough with low stress, the pores were remnant in the final body; however, while extruding the dough at higher stress, these voids could be minimized, and the green body could be void-free as discussed in a previous study (15).…”

Section: Resultsmentioning

confidence: 99%

“…Kneading was performed for 3-5 min under ambient atmospheric conditions to prepare a homogenous defect-free dough, which was molded to blanks via plastic deformation. Detailed composition and procedure of forming a green blank along with the characterization of the wet dough were discussed elsewhere (14,15).…”

Section: Green Body Preparation and Machiningmentioning

confidence: 99%

“…Flexural strength and Weibull analysis was performed in the previous study, where the three-point flexural strength of the extruded alumina and YSZ achieved was 408.3 ± 61.47 MPa and 690.5 ± 51.5 MPa, respectively (15). The Weibull analysis on the flexural strength of sintered alumina resulted in modulus 5.4 with the scale parameter of 404.6 MPa, whereas for Zirconia, the modulus is 10.02 with the scale parameter of 665.17 Mpa (15). The green body hardness of both dried blanks, as measured by nanoindentation, was 0.3 ± 0.1 Mpa, and the three-point flexural strength was 5.3 ± 0.8 Mpa.…”

Section: Density and Hardnessmentioning

confidence: 99%

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Monolith Dental Bridge by Soft Machining of Dried Ceramic Dough

et al. 2021

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All-ceramic fixed restorations are gaining popularity because of increased esthetic consciousness in the younger population. Monolith ceramic crowns and bridges are preferred to withstand masticatory loads where the availability of occlusal height is limited. Machining green blanks of ceramic with organic binders have been studied to reduce loss of final strength, cost, and wastage associated with milling partial sintered and sintered blanks. Notches on the surface/edge associated with green milling will disappear after sintering in contrast to sintered state machining where diamond polishing is essential. In this study, we explored a novel ceramic dough process to form a green body of alumina or 3 Mol% yttria-stabilized zirconium oxide (YSZ), and computer numerical control (CNC) machining was performed on the dried dough. Micro Computer Tomography analysis of the bridges after sintering revealed a negligible void volume, 0.06–0.08% of the total volume, with randomly dispersed voids. Precision analysis of the sintered bridges with respect to the reference file resulted in a deviation range of +0.56 to −0.79 mm, with negligible deviation on the cementation surface. The green machined surface had a roughness profile of 1.2–1.7 μm after machining and 2.2–2.4 μm after sintering, as revealed by 3D profilometry.

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Section: Density and Hardnesssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 99%

Section: Green Body Preparation and Machiningmentioning

confidence: 99%

Section: Density and Hardnessmentioning

confidence: 99%

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Monolith Dental Bridge by Soft Machining of Dried Ceramic Dough

et al. 2021

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“…Further proof of the usefulness of rheological measurements in forming ceramic materials with complex shapes is provided by the so-called novel dough forming process proposed by Seesal and Dhar [ 14 ]. This method, inspired by food technology of forming ceramic composites, is based on kneading a mixture of powders using a vinyl polymer until a mass with the desired visco-plastic properties is obtained.…”

Section: Introductionmentioning

confidence: 99%

ZTA Pipes with a Gradient Structure-Effect of the Rheological the Behavior of Ceramic Suspensions on the Gradient Structure and Characterized of the Obtained Products

et al. 2021

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This paper focuses on the verifying the possibility of producing Al2O3-ZrO2 composite pipes with a gradient structure using centrifugal slip casting method. The aim of the research is to define the correlation between the rheological properties of aqueous suspensions of ceramic powders with different solid loading and obtaining the ZrO2 phase gradient in the Al2O3 matrix. Such products, due to their unique properties, can be utilized in the transport of aggressive substances, even in extreme temperature or corrosive conditions. The suspensions and the sintered samples were characterized by: broad rheological analysis, scanning electron microscopy, X-ray diffraction, stereological analysis and Vickers hardness tests. The study reports on a series of samples produced of ceramic suspensions (70 vol.% Al2O3–30 vol.% ZrO2) differing in the total solid loading in the range of 30–55 vol.%. The results clearly indicate that obtaining the gradient structure of ceramic-ceramic composite pipes is closely related to the rheological properties of the suspensions from which the samples are cast. The phase gradient is obtainable from suspensions 30–40 vol.%, in which the possibility of moving ZrO2 particles relative to the Al2O3 is quite high—these suspensions are characterized by low viscosity and the dominance of viscous over elastic properties (G′ > G″).

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