Rheology of aqueous mullite–starch suspensions

Talou, Mariano H.; Villar, Marcelo A.; Camerucci, M.A.; Moreno, Rodrigo

doi:10.1016/j.jeurceramsoc.2011.03.031

Cited by 23 publications

(18 citation statements)

References 24 publications

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“…With a solid content of 60 wt%, the suspension exhibited shear‐thinning behavior in almost the entire range of shear rates, but showed a very slight dilatancy for shear rates higher than 700 s −1 . Regarding the suspension with the highest solid content (70 wt%), the rheological behavior was more complex, exhibiting a transition from shear thinning to shear thickening at shear rates as low as 200 s −1 (similarly complex rheological behavior was also reported in a previous work of the authors and by others authors, for mullite and mullite‐starch suspensions with similar properties). With increasing solids content the hysteresis of the viscosity versus shear rate curves increases.…”

Section: Resultssupporting

confidence: 79%

“…Measurements of this type provide in principle a complex modulus (or complex viscosity) that contains information both on the viscosity of the system in the liquid state and the elasticity (rigidity) of the system in the solid gel state . In previous work such measurements have been performed for starch‐containing suspensions of alumina and mullite, while the present work compares the rheology of corn‐ and potato starch‐containing suspension of a mixture of ceramic raw materials for the preparation of cordierite ceramics and relates the rheological findings to the mechanical properties of cordierite precursor green bodies. The latter (in this work determined via diametral compression tests) is in fact a characterization of the bodies after starch swelling, gelatinization and subsequent retrogradation during cooling, that is, in the state directly corresponding to the state where the characterization by rheometry ends.…”

Section: Introductionmentioning

confidence: 99%

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Starch Consolidation Casting of Cordierite Precursor Mixtures—Rheological Behavior and Green Body Properties

et al. 2015

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The rheology of suspensions and mechanical properties of green bodies with cordierite composition (raw materials 37 wt% kaolin, 41 wt% talc, 22 wt% alumina, resulting in 46.6 wt% SiO2, 38.1 wt% Al2O3, 13.6 wt% MgO) and two types of starch (corn or potato) are investigated. Rotational viscometry of suspensions with solids loading 50, 60, and 70 wt% without starch showed that all tend to be shear‐thinning with a small degree of thixotropy. Suspensions with a total solids loading of 60 wt% with 25 wt% replaced by starch exhibited higher viscosity and thixotropy, but the viscometric behavior is almost identical for the two starch types (apparent viscosities 130–50 mPa·s). Oscillatory rheometry shows that for suspensions with potato starch the onset temperature for gelatinization is 61°C–63°C, that is, lower than for corn starch (72°C–73°C). Maximum storage moduli and phase shift values after gelatinization are similar for both systems. The mechanical properties of green disks, measured via diametral compression tests, reveal clear differences between materials prepared with corn and potato starch, with the latter showing higher elastic modulus, higher strength, and higher deformation at fracture, obviously because of incompletely gelatinized starch granules in the green bodies prepared with corn starch.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Starch Consolidation Casting of Cordierite Precursor Mixtures—Rheological Behavior and Green Body Properties

et al. 2015

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“…By following an experimental procedure and conditions that were previously selected and studied, 19 aqueous mullite-starch suspensions (40 vol% total solid loading) were prepared for both routes by: (i) mixing mullite powder in water to a solid content of 40 vol% and dispersing with 0.45 wt% Dolapix CE-64 (Zschimmer & Schwarz, Lahnstein, Germany) with respect to the powder amount; (ii) homogenizing the mixture in a ball mill for 6 hours; and (iii) adding an aqueous starch suspension (40 vol%) and mixing for 5 minutes to obtain final starch and mullite contents of 10 and 30 vol% (with respect to the total volume of suspension), respectively.…”

Section: Processing Of Porous Mullite Materialsmentioning

confidence: 99%

Macroporous mullite materials prepared by novel shaping strategies based on starch thermogelation for thermal insulation

Talou

Miranzo

Camerucci

2017

Int J Applied Ceramic Tech

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A rigorous microstructural analysis of porous mullite materials developed using novel shaping strategies based on the starch consolidation casting, and their thermal properties in relation to the processing and starch type were accomplished in view of their use as thermal insulators. In order to characterize the size and morphology of pore, basic size and 2D shape factors, and global 3D stereological parameters were determined using microscopy techniques. Results indicated that the porosity volume, pore connectivity degree, and mean free path were the determining factors of the lowest heat transfer by conduction registered in materials prepared with cassava starch. This material is the best candidate to be used in thermal insulation.

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“…Upon the dilation of the starch particles, it acts as a binder allowing the solid body extraction of the mold once drying takes place [7]. This technique has been successfully applied to process pure oxide ceramics [8][9][10][11][12], mullite [13,14] and cordierite ceramics [15,16]. Nevertheless, the processing of hydroxyapatite via this technique seems to be modest or it is still quite rare.…”

Section: Introductionmentioning

confidence: 99%

Potato starch consolidation of aqueous HA suspension

Ahmed

Ewais

El‐Sheikh

2015

Journal of Asian Ceramic Societies

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a b s t r a c tThe influence of the addition of different amount of native potato starch on both the rheological properties and consolidation of the dispersed hydroxyapatite powder in aqueous media were thoroughly investigated. The amount of native potato starch addition has ranged from 10 to 40 vol.%. The results indicated that the rheological properties of the hydroxyapatite suspension were improved with addition of potato starch. The potato starch and HA particulates were found to be homogeneously distributed through SEM investigation. The relative density and the compressive strength of the consolidated slurries were increased with the increase of the starch amount till 30 vol.% addition and then decreased thereafter. Porous 3D-HA sample would produce from the sintering of green sample via consolidation technique at 1300 • C for 2 h. The porous sample was found to possess apparent porosity of about 50% with sufficient compressive strength.

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Rheology of aqueous mullite–starch suspensions

Cited by 23 publications

References 24 publications

Starch Consolidation Casting of Cordierite Precursor Mixtures—Rheological Behavior and Green Body Properties

Starch Consolidation Casting of Cordierite Precursor Mixtures—Rheological Behavior and Green Body Properties

Macroporous mullite materials prepared by novel shaping strategies based on starch thermogelation for thermal insulation

Potato starch consolidation of aqueous HA suspension

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