Rheological characterization of water-based slurries for the tape casting process

Bitterlich, Bernd; Lutz, Christiane; Roosen, Andreas

doi:10.1016/s0272-8842(02)00027-5

Cited by 87 publications

(69 citation statements)

References 7 publications

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“…On the other hand, τ c must not be too high because the slurry must flow under the shear conditions which occur during passing the doctor blades. 25 To investigate the thixotropic behavior of the PMN slurries the viscosity was measured as a function of shear rate in the range of 0.1-700 s −1 in an up and down sweep. A good superposition of up and down curves was obtained in the whole shear rate range.…”

Section: Rheology Of Pmn Slurriesmentioning

confidence: 99%

Preparation of the Pb(Mg1/3Nb2/3)O3 films by aqueous tape casting

Şakar‐Deliormanlı

Çelik

Polat

2009

Journal of the European Ceramic Society

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Lead magnesium niobate (PMN) is a relaxor ferroelectric material. Because of its high dielectric constant and superior electrostrictive properties it is commonly used in the manufacture of multilayer electronic devices which is typically produced by tape casting. However, preparation of PMN slurry formulations to use in aqueous tape casting process is not investigated in detail yet. Therefore, in this study aqueous PMN formulations were developed for tape casting and its relation with the final properties of PMN films were investigated. The slurries were prepared using poly(acrylic acid)-based comb polymer as the dispersant, nonionic acrylic latex as the binder and the hydroxypropyl methyl cellulose as the wetting agent. The results showed that it is possible to prepare flexible, crack-free PMN films using highly concentrated suspensions without using any plasticizer. The study gives guidelines for the aqueous tape casting of PMN and can be adapted to processing of other multi-component metal oxides.

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Section: Rheology Of Pmn Slurriesmentioning

confidence: 99%

Preparation of the Pb(Mg1/3Nb2/3)O3 films by aqueous tape casting

Şakar‐Deliormanlı

Çelik

Polat

2009

Journal of the European Ceramic Society

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“…Moreover, in this second step, the viscosity should undergo a fast increase to prevent undesired flow and sedimentation of the ceramic particles; thixotropy or other time-dependent behavior is not desired [5].…”

Section: Introductionmentioning

confidence: 99%

“…Studies on the effects of additives compared via model parameters have been performed in several works on aqueous ceramic suspensions for tape casting, applying the HerschelBulkley equation on PZT suspensions (Feng and Dogan [17]) and on alumina suspensions (Pagnoux et al [18]), and the Casson model on zirconia suspensions (Bitterlich et al [5]). …”

Section: Introductionmentioning

confidence: 99%

Flow properties of PLZTN aqueous suspensions for tape casting

Gardini

Deluca

Nagliati

et al. 2010

Ceramics International

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“…closer to the interface of the DM dense membrane) of the sample, and reduces towards the external surface of the PS porous substrate. To further quantify the difference in porosity between the inner part and external surface of the PS porous substrate, the connectivity density (Conn.D) was calculated based on the Euler characteristic [48,49], which represents an integral geometry related to the number of clusters per unit volume. Table 3 confirms the higher connectivity in the internal part closer to the center of the PS porous substrate, corresponding to a volume three orders of magnitude higher than that closer to the surface.…”

mentioning

confidence: 99%

Influence of porous structures on O 2 flux of BSCF asymmetric membranes

Rachadel

Motuzas²,

Machado

et al. 2017

Separation and Purification Technology

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This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. containing either a thin PL porous layer (40 µm), and/or a DS dense membrane (500 µm), and/or a PS porous substrate (500 µm). Activated carbon (i.e. porogen agent) at 20 wt% was mixed with BSCF to form porous structures. The membranes were processed by dry pressing followed by sintering at high temperatures. The best oxygen fluxes of 2.86 mL min -1 cm -2 at 850 °C were achieved with the PL-DS membrane configuration, which delivered a 42% higher oxygen flux than the DS dense membrane. This improvement was attributed to the larger contact area with the air feed conferred by the thin PL porous layer. However, the PL-DS-PS configuration resulted in a 21% decrease of oxygen flux as compared to the PL-DS membrane which strongly suggested that the PS porous substrate contributed extra resistance to the transport of oxygen. CT scan analysis of the PS porous substrate revealed that the pore volume was concentrated in the center of the PS porous substrate, with a reduced pore volume contribution closer to the external surface. 3D 2 analysis revealed the connectivity of the regions closer to the external surface was over three orders of magnitude lower than that of the center of the PS porous substrate, thus creating a bottle-neck.Although all pores were large (> 1 µm), the expected resistance should be very low, however, the bottle-neck region closer to the external surface provided additional resistance for the transport of oxygen from the membrane interface to the permeate side.

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Rheological characterization of water-based slurries for the tape casting process

Cited by 87 publications

References 7 publications

Preparation of the Pb(Mg1/3Nb2/3)O3 films by aqueous tape casting

Preparation of the Pb(Mg1/3Nb2/3)O3 films by aqueous tape casting

Flow properties of PLZTN aqueous suspensions for tape casting

Influence of porous structures on O 2 flux of BSCF asymmetric membranes

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